pmap.c revision 251897
1/*- 2 * Copyright (c) 1991 Regents of the University of California. 3 * All rights reserved. 4 * Copyright (c) 1994 John S. Dyson 5 * All rights reserved. 6 * Copyright (c) 1994 David Greenman 7 * All rights reserved. 8 * Copyright (c) 2005-2010 Alan L. Cox <alc@cs.rice.edu> 9 * All rights reserved. 10 * 11 * This code is derived from software contributed to Berkeley by 12 * the Systems Programming Group of the University of Utah Computer 13 * Science Department and William Jolitz of UUNET Technologies Inc. 14 * 15 * Redistribution and use in source and binary forms, with or without 16 * modification, are permitted provided that the following conditions 17 * are met: 18 * 1. Redistributions of source code must retain the above copyright 19 * notice, this list of conditions and the following disclaimer. 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in the 22 * documentation and/or other materials provided with the distribution. 23 * 3. All advertising materials mentioning features or use of this software 24 * must display the following acknowledgement: 25 * This product includes software developed by the University of 26 * California, Berkeley and its contributors. 27 * 4. Neither the name of the University nor the names of its contributors 28 * may be used to endorse or promote products derived from this software 29 * without specific prior written permission. 30 * 31 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 32 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 33 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 34 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 35 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 36 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 37 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 38 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 39 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 40 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 41 * SUCH DAMAGE. 42 * 43 * from: @(#)pmap.c 7.7 (Berkeley) 5/12/91 44 */ 45/*- 46 * Copyright (c) 2003 Networks Associates Technology, Inc. 47 * All rights reserved. 48 * 49 * This software was developed for the FreeBSD Project by Jake Burkholder, 50 * Safeport Network Services, and Network Associates Laboratories, the 51 * Security Research Division of Network Associates, Inc. under 52 * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA 53 * CHATS research program. 54 * 55 * Redistribution and use in source and binary forms, with or without 56 * modification, are permitted provided that the following conditions 57 * are met: 58 * 1. Redistributions of source code must retain the above copyright 59 * notice, this list of conditions and the following disclaimer. 60 * 2. Redistributions in binary form must reproduce the above copyright 61 * notice, this list of conditions and the following disclaimer in the 62 * documentation and/or other materials provided with the distribution. 63 * 64 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 65 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 66 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 67 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 68 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 69 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 70 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 71 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 72 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 73 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 74 * SUCH DAMAGE. 75 */ 76 77#include <sys/cdefs.h> 78__FBSDID("$FreeBSD: stable/9/sys/i386/i386/pmap.c 251897 2013-06-18 05:21:40Z scottl $"); 79 80/* 81 * Manages physical address maps. 82 * 83 * In addition to hardware address maps, this 84 * module is called upon to provide software-use-only 85 * maps which may or may not be stored in the same 86 * form as hardware maps. These pseudo-maps are 87 * used to store intermediate results from copy 88 * operations to and from address spaces. 89 * 90 * Since the information managed by this module is 91 * also stored by the logical address mapping module, 92 * this module may throw away valid virtual-to-physical 93 * mappings at almost any time. However, invalidations 94 * of virtual-to-physical mappings must be done as 95 * requested. 96 * 97 * In order to cope with hardware architectures which 98 * make virtual-to-physical map invalidates expensive, 99 * this module may delay invalidate or reduced protection 100 * operations until such time as they are actually 101 * necessary. This module is given full information as 102 * to which processors are currently using which maps, 103 * and to when physical maps must be made correct. 104 */ 105 106#include "opt_apic.h" 107#include "opt_cpu.h" 108#include "opt_pmap.h" 109#include "opt_smp.h" 110#include "opt_xbox.h" 111 112#include <sys/param.h> 113#include <sys/systm.h> 114#include <sys/kernel.h> 115#include <sys/ktr.h> 116#include <sys/lock.h> 117#include <sys/malloc.h> 118#include <sys/mman.h> 119#include <sys/msgbuf.h> 120#include <sys/mutex.h> 121#include <sys/proc.h> 122#include <sys/rwlock.h> 123#include <sys/sf_buf.h> 124#include <sys/sx.h> 125#include <sys/vmmeter.h> 126#include <sys/sched.h> 127#include <sys/sysctl.h> 128#ifdef SMP 129#include <sys/smp.h> 130#else 131#include <sys/cpuset.h> 132#endif 133 134#include <vm/vm.h> 135#include <vm/vm_param.h> 136#include <vm/vm_kern.h> 137#include <vm/vm_page.h> 138#include <vm/vm_map.h> 139#include <vm/vm_object.h> 140#include <vm/vm_extern.h> 141#include <vm/vm_pageout.h> 142#include <vm/vm_pager.h> 143#include <vm/vm_reserv.h> 144#include <vm/uma.h> 145 146#ifdef DEV_APIC 147#include <sys/bus.h> 148#include <machine/intr_machdep.h> 149#include <machine/apicvar.h> 150#endif 151#include <machine/cpu.h> 152#include <machine/cputypes.h> 153#include <machine/md_var.h> 154#include <machine/pcb.h> 155#include <machine/specialreg.h> 156#ifdef SMP 157#include <machine/smp.h> 158#endif 159 160#ifdef XBOX 161#include <machine/xbox.h> 162#endif 163 164#if !defined(CPU_DISABLE_SSE) && defined(I686_CPU) 165#define CPU_ENABLE_SSE 166#endif 167 168#ifndef PMAP_SHPGPERPROC 169#define PMAP_SHPGPERPROC 200 170#endif 171 172#if !defined(DIAGNOSTIC) 173#ifdef __GNUC_GNU_INLINE__ 174#define PMAP_INLINE __attribute__((__gnu_inline__)) inline 175#else 176#define PMAP_INLINE extern inline 177#endif 178#else 179#define PMAP_INLINE 180#endif 181 182#ifdef PV_STATS 183#define PV_STAT(x) do { x ; } while (0) 184#else 185#define PV_STAT(x) do { } while (0) 186#endif 187 188#define pa_index(pa) ((pa) >> PDRSHIFT) 189#define pa_to_pvh(pa) (&pv_table[pa_index(pa)]) 190 191/* 192 * Get PDEs and PTEs for user/kernel address space 193 */ 194#define pmap_pde(m, v) (&((m)->pm_pdir[(vm_offset_t)(v) >> PDRSHIFT])) 195#define pdir_pde(m, v) (m[(vm_offset_t)(v) >> PDRSHIFT]) 196 197#define pmap_pde_v(pte) ((*(int *)pte & PG_V) != 0) 198#define pmap_pte_w(pte) ((*(int *)pte & PG_W) != 0) 199#define pmap_pte_m(pte) ((*(int *)pte & PG_M) != 0) 200#define pmap_pte_u(pte) ((*(int *)pte & PG_A) != 0) 201#define pmap_pte_v(pte) ((*(int *)pte & PG_V) != 0) 202 203#define pmap_pte_set_w(pte, v) ((v) ? atomic_set_int((u_int *)(pte), PG_W) : \ 204 atomic_clear_int((u_int *)(pte), PG_W)) 205#define pmap_pte_set_prot(pte, v) ((*(int *)pte &= ~PG_PROT), (*(int *)pte |= (v))) 206 207struct pmap kernel_pmap_store; 208LIST_HEAD(pmaplist, pmap); 209static struct pmaplist allpmaps; 210static struct mtx allpmaps_lock; 211 212vm_offset_t virtual_avail; /* VA of first avail page (after kernel bss) */ 213vm_offset_t virtual_end; /* VA of last avail page (end of kernel AS) */ 214int pgeflag = 0; /* PG_G or-in */ 215int pseflag = 0; /* PG_PS or-in */ 216 217static int nkpt = NKPT; 218vm_offset_t kernel_vm_end = KERNBASE + NKPT * NBPDR; 219extern u_int32_t KERNend; 220extern u_int32_t KPTphys; 221 222#ifdef PAE 223pt_entry_t pg_nx; 224static uma_zone_t pdptzone; 225#endif 226 227static SYSCTL_NODE(_vm, OID_AUTO, pmap, CTLFLAG_RD, 0, "VM/pmap parameters"); 228 229static int pat_works = 1; 230SYSCTL_INT(_vm_pmap, OID_AUTO, pat_works, CTLFLAG_RD, &pat_works, 1, 231 "Is page attribute table fully functional?"); 232 233static int pg_ps_enabled = 1; 234SYSCTL_INT(_vm_pmap, OID_AUTO, pg_ps_enabled, CTLFLAG_RDTUN, &pg_ps_enabled, 0, 235 "Are large page mappings enabled?"); 236 237#define PAT_INDEX_SIZE 8 238static int pat_index[PAT_INDEX_SIZE]; /* cache mode to PAT index conversion */ 239 240/* 241 * Isolate the global pv list lock from data and other locks to prevent false 242 * sharing within the cache. 243 */ 244static struct { 245 struct rwlock lock; 246 char padding[CACHE_LINE_SIZE - sizeof(struct rwlock)]; 247} pvh_global __aligned(CACHE_LINE_SIZE); 248 249#define pvh_global_lock pvh_global.lock 250 251/* 252 * Data for the pv entry allocation mechanism 253 */ 254static TAILQ_HEAD(pch, pv_chunk) pv_chunks = TAILQ_HEAD_INITIALIZER(pv_chunks); 255static int pv_entry_count = 0, pv_entry_max = 0, pv_entry_high_water = 0; 256static struct md_page *pv_table; 257static int shpgperproc = PMAP_SHPGPERPROC; 258 259struct pv_chunk *pv_chunkbase; /* KVA block for pv_chunks */ 260int pv_maxchunks; /* How many chunks we have KVA for */ 261vm_offset_t pv_vafree; /* freelist stored in the PTE */ 262 263/* 264 * All those kernel PT submaps that BSD is so fond of 265 */ 266struct sysmaps { 267 struct mtx lock; 268 pt_entry_t *CMAP1; 269 pt_entry_t *CMAP2; 270 caddr_t CADDR1; 271 caddr_t CADDR2; 272}; 273static struct sysmaps sysmaps_pcpu[MAXCPU]; 274pt_entry_t *CMAP1 = 0; 275static pt_entry_t *CMAP3; 276static pd_entry_t *KPTD; 277caddr_t CADDR1 = 0, ptvmmap = 0; 278static caddr_t CADDR3; 279struct msgbuf *msgbufp = 0; 280 281/* 282 * Crashdump maps. 283 */ 284static caddr_t crashdumpmap; 285 286static pt_entry_t *PMAP1 = 0, *PMAP2; 287static pt_entry_t *PADDR1 = 0, *PADDR2; 288#ifdef SMP 289static int PMAP1cpu; 290static int PMAP1changedcpu; 291SYSCTL_INT(_debug, OID_AUTO, PMAP1changedcpu, CTLFLAG_RD, 292 &PMAP1changedcpu, 0, 293 "Number of times pmap_pte_quick changed CPU with same PMAP1"); 294#endif 295static int PMAP1changed; 296SYSCTL_INT(_debug, OID_AUTO, PMAP1changed, CTLFLAG_RD, 297 &PMAP1changed, 0, 298 "Number of times pmap_pte_quick changed PMAP1"); 299static int PMAP1unchanged; 300SYSCTL_INT(_debug, OID_AUTO, PMAP1unchanged, CTLFLAG_RD, 301 &PMAP1unchanged, 0, 302 "Number of times pmap_pte_quick didn't change PMAP1"); 303static struct mtx PMAP2mutex; 304 305static void free_pv_chunk(struct pv_chunk *pc); 306static void free_pv_entry(pmap_t pmap, pv_entry_t pv); 307static pv_entry_t get_pv_entry(pmap_t pmap, boolean_t try); 308static void pmap_pv_demote_pde(pmap_t pmap, vm_offset_t va, vm_paddr_t pa); 309static boolean_t pmap_pv_insert_pde(pmap_t pmap, vm_offset_t va, vm_paddr_t pa); 310static void pmap_pv_promote_pde(pmap_t pmap, vm_offset_t va, vm_paddr_t pa); 311static void pmap_pvh_free(struct md_page *pvh, pmap_t pmap, vm_offset_t va); 312static pv_entry_t pmap_pvh_remove(struct md_page *pvh, pmap_t pmap, 313 vm_offset_t va); 314static int pmap_pvh_wired_mappings(struct md_page *pvh, int count); 315 316static boolean_t pmap_demote_pde(pmap_t pmap, pd_entry_t *pde, vm_offset_t va); 317static boolean_t pmap_enter_pde(pmap_t pmap, vm_offset_t va, vm_page_t m, 318 vm_prot_t prot); 319static vm_page_t pmap_enter_quick_locked(pmap_t pmap, vm_offset_t va, 320 vm_page_t m, vm_prot_t prot, vm_page_t mpte); 321static void pmap_flush_page(vm_page_t m); 322static void pmap_insert_pt_page(pmap_t pmap, vm_page_t mpte); 323static void pmap_fill_ptp(pt_entry_t *firstpte, pt_entry_t newpte); 324static boolean_t pmap_is_modified_pvh(struct md_page *pvh); 325static boolean_t pmap_is_referenced_pvh(struct md_page *pvh); 326static void pmap_kenter_attr(vm_offset_t va, vm_paddr_t pa, int mode); 327static void pmap_kenter_pde(vm_offset_t va, pd_entry_t newpde); 328static vm_page_t pmap_lookup_pt_page(pmap_t pmap, vm_offset_t va); 329static void pmap_pde_attr(pd_entry_t *pde, int cache_bits); 330static void pmap_promote_pde(pmap_t pmap, pd_entry_t *pde, vm_offset_t va); 331static boolean_t pmap_protect_pde(pmap_t pmap, pd_entry_t *pde, vm_offset_t sva, 332 vm_prot_t prot); 333static void pmap_pte_attr(pt_entry_t *pte, int cache_bits); 334static void pmap_remove_pde(pmap_t pmap, pd_entry_t *pdq, vm_offset_t sva, 335 vm_page_t *free); 336static int pmap_remove_pte(pmap_t pmap, pt_entry_t *ptq, vm_offset_t sva, 337 vm_page_t *free); 338static void pmap_remove_pt_page(pmap_t pmap, vm_page_t mpte); 339static void pmap_remove_page(struct pmap *pmap, vm_offset_t va, 340 vm_page_t *free); 341static void pmap_remove_entry(struct pmap *pmap, vm_page_t m, 342 vm_offset_t va); 343static void pmap_insert_entry(pmap_t pmap, vm_offset_t va, vm_page_t m); 344static boolean_t pmap_try_insert_pv_entry(pmap_t pmap, vm_offset_t va, 345 vm_page_t m); 346static void pmap_update_pde(pmap_t pmap, vm_offset_t va, pd_entry_t *pde, 347 pd_entry_t newpde); 348static void pmap_update_pde_invalidate(vm_offset_t va, pd_entry_t newpde); 349 350static vm_page_t pmap_allocpte(pmap_t pmap, vm_offset_t va, int flags); 351 352static vm_page_t _pmap_allocpte(pmap_t pmap, u_int ptepindex, int flags); 353static void _pmap_unwire_ptp(pmap_t pmap, vm_page_t m, vm_page_t *free); 354static pt_entry_t *pmap_pte_quick(pmap_t pmap, vm_offset_t va); 355static void pmap_pte_release(pt_entry_t *pte); 356static int pmap_unuse_pt(pmap_t, vm_offset_t, vm_page_t *); 357#ifdef PAE 358static void *pmap_pdpt_allocf(uma_zone_t zone, int bytes, u_int8_t *flags, int wait); 359#endif 360static void pmap_set_pg(void); 361 362static __inline void pagezero(void *page); 363 364CTASSERT(1 << PDESHIFT == sizeof(pd_entry_t)); 365CTASSERT(1 << PTESHIFT == sizeof(pt_entry_t)); 366 367/* 368 * If you get an error here, then you set KVA_PAGES wrong! See the 369 * description of KVA_PAGES in sys/i386/include/pmap.h. It must be 370 * multiple of 4 for a normal kernel, or a multiple of 8 for a PAE. 371 */ 372CTASSERT(KERNBASE % (1 << 24) == 0); 373 374/* 375 * Bootstrap the system enough to run with virtual memory. 376 * 377 * On the i386 this is called after mapping has already been enabled 378 * and just syncs the pmap module with what has already been done. 379 * [We can't call it easily with mapping off since the kernel is not 380 * mapped with PA == VA, hence we would have to relocate every address 381 * from the linked base (virtual) address "KERNBASE" to the actual 382 * (physical) address starting relative to 0] 383 */ 384void 385pmap_bootstrap(vm_paddr_t firstaddr) 386{ 387 vm_offset_t va; 388 pt_entry_t *pte, *unused; 389 struct sysmaps *sysmaps; 390 int i; 391 392 /* 393 * Initialize the first available kernel virtual address. However, 394 * using "firstaddr" may waste a few pages of the kernel virtual 395 * address space, because locore may not have mapped every physical 396 * page that it allocated. Preferably, locore would provide a first 397 * unused virtual address in addition to "firstaddr". 398 */ 399 virtual_avail = (vm_offset_t) KERNBASE + firstaddr; 400 401 virtual_end = VM_MAX_KERNEL_ADDRESS; 402 403 /* 404 * Initialize the kernel pmap (which is statically allocated). 405 */ 406 PMAP_LOCK_INIT(kernel_pmap); 407 kernel_pmap->pm_pdir = (pd_entry_t *) (KERNBASE + (u_int)IdlePTD); 408#ifdef PAE 409 kernel_pmap->pm_pdpt = (pdpt_entry_t *) (KERNBASE + (u_int)IdlePDPT); 410#endif 411 kernel_pmap->pm_root = NULL; 412 CPU_FILL(&kernel_pmap->pm_active); /* don't allow deactivation */ 413 TAILQ_INIT(&kernel_pmap->pm_pvchunk); 414 415 /* 416 * Initialize the global pv list lock. 417 */ 418 rw_init(&pvh_global_lock, "pmap pv global"); 419 420 LIST_INIT(&allpmaps); 421 422 /* 423 * Request a spin mutex so that changes to allpmaps cannot be 424 * preempted by smp_rendezvous_cpus(). Otherwise, 425 * pmap_update_pde_kernel() could access allpmaps while it is 426 * being changed. 427 */ 428 mtx_init(&allpmaps_lock, "allpmaps", NULL, MTX_SPIN); 429 mtx_lock_spin(&allpmaps_lock); 430 LIST_INSERT_HEAD(&allpmaps, kernel_pmap, pm_list); 431 mtx_unlock_spin(&allpmaps_lock); 432 433 /* 434 * Reserve some special page table entries/VA space for temporary 435 * mapping of pages. 436 */ 437#define SYSMAP(c, p, v, n) \ 438 v = (c)va; va += ((n)*PAGE_SIZE); p = pte; pte += (n); 439 440 va = virtual_avail; 441 pte = vtopte(va); 442 443 /* 444 * CMAP1/CMAP2 are used for zeroing and copying pages. 445 * CMAP3 is used for the idle process page zeroing. 446 */ 447 for (i = 0; i < MAXCPU; i++) { 448 sysmaps = &sysmaps_pcpu[i]; 449 mtx_init(&sysmaps->lock, "SYSMAPS", NULL, MTX_DEF); 450 SYSMAP(caddr_t, sysmaps->CMAP1, sysmaps->CADDR1, 1) 451 SYSMAP(caddr_t, sysmaps->CMAP2, sysmaps->CADDR2, 1) 452 } 453 SYSMAP(caddr_t, CMAP1, CADDR1, 1) 454 SYSMAP(caddr_t, CMAP3, CADDR3, 1) 455 456 /* 457 * Crashdump maps. 458 */ 459 SYSMAP(caddr_t, unused, crashdumpmap, MAXDUMPPGS) 460 461 /* 462 * ptvmmap is used for reading arbitrary physical pages via /dev/mem. 463 */ 464 SYSMAP(caddr_t, unused, ptvmmap, 1) 465 466 /* 467 * msgbufp is used to map the system message buffer. 468 */ 469 SYSMAP(struct msgbuf *, unused, msgbufp, atop(round_page(msgbufsize))) 470 471 /* 472 * KPTmap is used by pmap_kextract(). 473 * 474 * KPTmap is first initialized by locore. However, that initial 475 * KPTmap can only support NKPT page table pages. Here, a larger 476 * KPTmap is created that can support KVA_PAGES page table pages. 477 */ 478 SYSMAP(pt_entry_t *, KPTD, KPTmap, KVA_PAGES) 479 480 for (i = 0; i < NKPT; i++) 481 KPTD[i] = (KPTphys + (i << PAGE_SHIFT)) | pgeflag | PG_RW | PG_V; 482 483 /* 484 * Adjust the start of the KPTD and KPTmap so that the implementation 485 * of pmap_kextract() and pmap_growkernel() can be made simpler. 486 */ 487 KPTD -= KPTDI; 488 KPTmap -= i386_btop(KPTDI << PDRSHIFT); 489 490 /* 491 * PADDR1 and PADDR2 are used by pmap_pte_quick() and pmap_pte(), 492 * respectively. 493 */ 494 SYSMAP(pt_entry_t *, PMAP1, PADDR1, 1) 495 SYSMAP(pt_entry_t *, PMAP2, PADDR2, 1) 496 497 mtx_init(&PMAP2mutex, "PMAP2", NULL, MTX_DEF); 498 499 virtual_avail = va; 500 501 /* 502 * Leave in place an identity mapping (virt == phys) for the low 1 MB 503 * physical memory region that is used by the ACPI wakeup code. This 504 * mapping must not have PG_G set. 505 */ 506#ifdef XBOX 507 /* FIXME: This is gross, but needed for the XBOX. Since we are in such 508 * an early stadium, we cannot yet neatly map video memory ... :-( 509 * Better fixes are very welcome! */ 510 if (!arch_i386_is_xbox) 511#endif 512 for (i = 1; i < NKPT; i++) 513 PTD[i] = 0; 514 515 /* Initialize the PAT MSR if present. */ 516 pmap_init_pat(); 517 518 /* Turn on PG_G on kernel page(s) */ 519 pmap_set_pg(); 520} 521 522/* 523 * Setup the PAT MSR. 524 */ 525void 526pmap_init_pat(void) 527{ 528 int pat_table[PAT_INDEX_SIZE]; 529 uint64_t pat_msr; 530 u_long cr0, cr4; 531 int i; 532 533 /* Set default PAT index table. */ 534 for (i = 0; i < PAT_INDEX_SIZE; i++) 535 pat_table[i] = -1; 536 pat_table[PAT_WRITE_BACK] = 0; 537 pat_table[PAT_WRITE_THROUGH] = 1; 538 pat_table[PAT_UNCACHEABLE] = 3; 539 pat_table[PAT_WRITE_COMBINING] = 3; 540 pat_table[PAT_WRITE_PROTECTED] = 3; 541 pat_table[PAT_UNCACHED] = 3; 542 543 /* Bail if this CPU doesn't implement PAT. */ 544 if ((cpu_feature & CPUID_PAT) == 0) { 545 for (i = 0; i < PAT_INDEX_SIZE; i++) 546 pat_index[i] = pat_table[i]; 547 pat_works = 0; 548 return; 549 } 550 551 /* 552 * Due to some Intel errata, we can only safely use the lower 4 553 * PAT entries. 554 * 555 * Intel Pentium III Processor Specification Update 556 * Errata E.27 (Upper Four PAT Entries Not Usable With Mode B 557 * or Mode C Paging) 558 * 559 * Intel Pentium IV Processor Specification Update 560 * Errata N46 (PAT Index MSB May Be Calculated Incorrectly) 561 */ 562 if (cpu_vendor_id == CPU_VENDOR_INTEL && 563 !(CPUID_TO_FAMILY(cpu_id) == 6 && CPUID_TO_MODEL(cpu_id) >= 0xe)) 564 pat_works = 0; 565 566 /* Initialize default PAT entries. */ 567 pat_msr = PAT_VALUE(0, PAT_WRITE_BACK) | 568 PAT_VALUE(1, PAT_WRITE_THROUGH) | 569 PAT_VALUE(2, PAT_UNCACHED) | 570 PAT_VALUE(3, PAT_UNCACHEABLE) | 571 PAT_VALUE(4, PAT_WRITE_BACK) | 572 PAT_VALUE(5, PAT_WRITE_THROUGH) | 573 PAT_VALUE(6, PAT_UNCACHED) | 574 PAT_VALUE(7, PAT_UNCACHEABLE); 575 576 if (pat_works) { 577 /* 578 * Leave the indices 0-3 at the default of WB, WT, UC-, and UC. 579 * Program 5 and 6 as WP and WC. 580 * Leave 4 and 7 as WB and UC. 581 */ 582 pat_msr &= ~(PAT_MASK(5) | PAT_MASK(6)); 583 pat_msr |= PAT_VALUE(5, PAT_WRITE_PROTECTED) | 584 PAT_VALUE(6, PAT_WRITE_COMBINING); 585 pat_table[PAT_UNCACHED] = 2; 586 pat_table[PAT_WRITE_PROTECTED] = 5; 587 pat_table[PAT_WRITE_COMBINING] = 6; 588 } else { 589 /* 590 * Just replace PAT Index 2 with WC instead of UC-. 591 */ 592 pat_msr &= ~PAT_MASK(2); 593 pat_msr |= PAT_VALUE(2, PAT_WRITE_COMBINING); 594 pat_table[PAT_WRITE_COMBINING] = 2; 595 } 596 597 /* Disable PGE. */ 598 cr4 = rcr4(); 599 load_cr4(cr4 & ~CR4_PGE); 600 601 /* Disable caches (CD = 1, NW = 0). */ 602 cr0 = rcr0(); 603 load_cr0((cr0 & ~CR0_NW) | CR0_CD); 604 605 /* Flushes caches and TLBs. */ 606 wbinvd(); 607 invltlb(); 608 609 /* Update PAT and index table. */ 610 wrmsr(MSR_PAT, pat_msr); 611 for (i = 0; i < PAT_INDEX_SIZE; i++) 612 pat_index[i] = pat_table[i]; 613 614 /* Flush caches and TLBs again. */ 615 wbinvd(); 616 invltlb(); 617 618 /* Restore caches and PGE. */ 619 load_cr0(cr0); 620 load_cr4(cr4); 621} 622 623/* 624 * Set PG_G on kernel pages. Only the BSP calls this when SMP is turned on. 625 */ 626static void 627pmap_set_pg(void) 628{ 629 pt_entry_t *pte; 630 vm_offset_t va, endva; 631 632 if (pgeflag == 0) 633 return; 634 635 endva = KERNBASE + KERNend; 636 637 if (pseflag) { 638 va = KERNBASE + KERNLOAD; 639 while (va < endva) { 640 pdir_pde(PTD, va) |= pgeflag; 641 invltlb(); /* Play it safe, invltlb() every time */ 642 va += NBPDR; 643 } 644 } else { 645 va = (vm_offset_t)btext; 646 while (va < endva) { 647 pte = vtopte(va); 648 if (*pte) 649 *pte |= pgeflag; 650 invltlb(); /* Play it safe, invltlb() every time */ 651 va += PAGE_SIZE; 652 } 653 } 654} 655 656/* 657 * Initialize a vm_page's machine-dependent fields. 658 */ 659void 660pmap_page_init(vm_page_t m) 661{ 662 663 TAILQ_INIT(&m->md.pv_list); 664 m->md.pat_mode = PAT_WRITE_BACK; 665} 666 667#ifdef PAE 668static void * 669pmap_pdpt_allocf(uma_zone_t zone, int bytes, u_int8_t *flags, int wait) 670{ 671 672 /* Inform UMA that this allocator uses kernel_map/object. */ 673 *flags = UMA_SLAB_KERNEL; 674 return ((void *)kmem_alloc_contig(kernel_map, bytes, wait, 0x0ULL, 675 0xffffffffULL, 1, 0, VM_MEMATTR_DEFAULT)); 676} 677#endif 678 679/* 680 * ABuse the pte nodes for unmapped kva to thread a kva freelist through. 681 * Requirements: 682 * - Must deal with pages in order to ensure that none of the PG_* bits 683 * are ever set, PG_V in particular. 684 * - Assumes we can write to ptes without pte_store() atomic ops, even 685 * on PAE systems. This should be ok. 686 * - Assumes nothing will ever test these addresses for 0 to indicate 687 * no mapping instead of correctly checking PG_V. 688 * - Assumes a vm_offset_t will fit in a pte (true for i386). 689 * Because PG_V is never set, there can be no mappings to invalidate. 690 */ 691static vm_offset_t 692pmap_ptelist_alloc(vm_offset_t *head) 693{ 694 pt_entry_t *pte; 695 vm_offset_t va; 696 697 va = *head; 698 if (va == 0) 699 return (va); /* Out of memory */ 700 pte = vtopte(va); 701 *head = *pte; 702 if (*head & PG_V) 703 panic("pmap_ptelist_alloc: va with PG_V set!"); 704 *pte = 0; 705 return (va); 706} 707 708static void 709pmap_ptelist_free(vm_offset_t *head, vm_offset_t va) 710{ 711 pt_entry_t *pte; 712 713 if (va & PG_V) 714 panic("pmap_ptelist_free: freeing va with PG_V set!"); 715 pte = vtopte(va); 716 *pte = *head; /* virtual! PG_V is 0 though */ 717 *head = va; 718} 719 720static void 721pmap_ptelist_init(vm_offset_t *head, void *base, int npages) 722{ 723 int i; 724 vm_offset_t va; 725 726 *head = 0; 727 for (i = npages - 1; i >= 0; i--) { 728 va = (vm_offset_t)base + i * PAGE_SIZE; 729 pmap_ptelist_free(head, va); 730 } 731} 732 733 734/* 735 * Initialize the pmap module. 736 * Called by vm_init, to initialize any structures that the pmap 737 * system needs to map virtual memory. 738 */ 739void 740pmap_init(void) 741{ 742 vm_page_t mpte; 743 vm_size_t s; 744 int i, pv_npg; 745 746 /* 747 * Initialize the vm page array entries for the kernel pmap's 748 * page table pages. 749 */ 750 for (i = 0; i < NKPT; i++) { 751 mpte = PHYS_TO_VM_PAGE(KPTphys + (i << PAGE_SHIFT)); 752 KASSERT(mpte >= vm_page_array && 753 mpte < &vm_page_array[vm_page_array_size], 754 ("pmap_init: page table page is out of range")); 755 mpte->pindex = i + KPTDI; 756 mpte->phys_addr = KPTphys + (i << PAGE_SHIFT); 757 } 758 759 /* 760 * Initialize the address space (zone) for the pv entries. Set a 761 * high water mark so that the system can recover from excessive 762 * numbers of pv entries. 763 */ 764 TUNABLE_INT_FETCH("vm.pmap.shpgperproc", &shpgperproc); 765 pv_entry_max = shpgperproc * maxproc + cnt.v_page_count; 766 TUNABLE_INT_FETCH("vm.pmap.pv_entries", &pv_entry_max); 767 pv_entry_max = roundup(pv_entry_max, _NPCPV); 768 pv_entry_high_water = 9 * (pv_entry_max / 10); 769 770 /* 771 * If the kernel is running in a virtual machine on an AMD Family 10h 772 * processor, then it must assume that MCA is enabled by the virtual 773 * machine monitor. 774 */ 775 if (vm_guest == VM_GUEST_VM && cpu_vendor_id == CPU_VENDOR_AMD && 776 CPUID_TO_FAMILY(cpu_id) == 0x10) 777 workaround_erratum383 = 1; 778 779 /* 780 * Are large page mappings supported and enabled? 781 */ 782 TUNABLE_INT_FETCH("vm.pmap.pg_ps_enabled", &pg_ps_enabled); 783 if (pseflag == 0) 784 pg_ps_enabled = 0; 785 else if (pg_ps_enabled) { 786 KASSERT(MAXPAGESIZES > 1 && pagesizes[1] == 0, 787 ("pmap_init: can't assign to pagesizes[1]")); 788 pagesizes[1] = NBPDR; 789 } 790 791 /* 792 * Calculate the size of the pv head table for superpages. 793 */ 794 for (i = 0; phys_avail[i + 1]; i += 2); 795 pv_npg = round_4mpage(phys_avail[(i - 2) + 1]) / NBPDR; 796 797 /* 798 * Allocate memory for the pv head table for superpages. 799 */ 800 s = (vm_size_t)(pv_npg * sizeof(struct md_page)); 801 s = round_page(s); 802 pv_table = (struct md_page *)kmem_alloc(kernel_map, s); 803 for (i = 0; i < pv_npg; i++) 804 TAILQ_INIT(&pv_table[i].pv_list); 805 806 pv_maxchunks = MAX(pv_entry_max / _NPCPV, maxproc); 807 pv_chunkbase = (struct pv_chunk *)kmem_alloc_nofault(kernel_map, 808 PAGE_SIZE * pv_maxchunks); 809 if (pv_chunkbase == NULL) 810 panic("pmap_init: not enough kvm for pv chunks"); 811 pmap_ptelist_init(&pv_vafree, pv_chunkbase, pv_maxchunks); 812#ifdef PAE 813 pdptzone = uma_zcreate("PDPT", NPGPTD * sizeof(pdpt_entry_t), NULL, 814 NULL, NULL, NULL, (NPGPTD * sizeof(pdpt_entry_t)) - 1, 815 UMA_ZONE_VM | UMA_ZONE_NOFREE); 816 uma_zone_set_allocf(pdptzone, pmap_pdpt_allocf); 817#endif 818} 819 820 821SYSCTL_INT(_vm_pmap, OID_AUTO, pv_entry_max, CTLFLAG_RD, &pv_entry_max, 0, 822 "Max number of PV entries"); 823SYSCTL_INT(_vm_pmap, OID_AUTO, shpgperproc, CTLFLAG_RD, &shpgperproc, 0, 824 "Page share factor per proc"); 825 826static SYSCTL_NODE(_vm_pmap, OID_AUTO, pde, CTLFLAG_RD, 0, 827 "2/4MB page mapping counters"); 828 829static u_long pmap_pde_demotions; 830SYSCTL_ULONG(_vm_pmap_pde, OID_AUTO, demotions, CTLFLAG_RD, 831 &pmap_pde_demotions, 0, "2/4MB page demotions"); 832 833static u_long pmap_pde_mappings; 834SYSCTL_ULONG(_vm_pmap_pde, OID_AUTO, mappings, CTLFLAG_RD, 835 &pmap_pde_mappings, 0, "2/4MB page mappings"); 836 837static u_long pmap_pde_p_failures; 838SYSCTL_ULONG(_vm_pmap_pde, OID_AUTO, p_failures, CTLFLAG_RD, 839 &pmap_pde_p_failures, 0, "2/4MB page promotion failures"); 840 841static u_long pmap_pde_promotions; 842SYSCTL_ULONG(_vm_pmap_pde, OID_AUTO, promotions, CTLFLAG_RD, 843 &pmap_pde_promotions, 0, "2/4MB page promotions"); 844 845/*************************************************** 846 * Low level helper routines..... 847 ***************************************************/ 848 849/* 850 * Determine the appropriate bits to set in a PTE or PDE for a specified 851 * caching mode. 852 */ 853int 854pmap_cache_bits(int mode, boolean_t is_pde) 855{ 856 int cache_bits, pat_flag, pat_idx; 857 858 if (mode < 0 || mode >= PAT_INDEX_SIZE || pat_index[mode] < 0) 859 panic("Unknown caching mode %d\n", mode); 860 861 /* The PAT bit is different for PTE's and PDE's. */ 862 pat_flag = is_pde ? PG_PDE_PAT : PG_PTE_PAT; 863 864 /* Map the caching mode to a PAT index. */ 865 pat_idx = pat_index[mode]; 866 867 /* Map the 3-bit index value into the PAT, PCD, and PWT bits. */ 868 cache_bits = 0; 869 if (pat_idx & 0x4) 870 cache_bits |= pat_flag; 871 if (pat_idx & 0x2) 872 cache_bits |= PG_NC_PCD; 873 if (pat_idx & 0x1) 874 cache_bits |= PG_NC_PWT; 875 return (cache_bits); 876} 877 878/* 879 * The caller is responsible for maintaining TLB consistency. 880 */ 881static void 882pmap_kenter_pde(vm_offset_t va, pd_entry_t newpde) 883{ 884 pd_entry_t *pde; 885 pmap_t pmap; 886 boolean_t PTD_updated; 887 888 PTD_updated = FALSE; 889 mtx_lock_spin(&allpmaps_lock); 890 LIST_FOREACH(pmap, &allpmaps, pm_list) { 891 if ((pmap->pm_pdir[PTDPTDI] & PG_FRAME) == (PTDpde[0] & 892 PG_FRAME)) 893 PTD_updated = TRUE; 894 pde = pmap_pde(pmap, va); 895 pde_store(pde, newpde); 896 } 897 mtx_unlock_spin(&allpmaps_lock); 898 KASSERT(PTD_updated, 899 ("pmap_kenter_pde: current page table is not in allpmaps")); 900} 901 902/* 903 * After changing the page size for the specified virtual address in the page 904 * table, flush the corresponding entries from the processor's TLB. Only the 905 * calling processor's TLB is affected. 906 * 907 * The calling thread must be pinned to a processor. 908 */ 909static void 910pmap_update_pde_invalidate(vm_offset_t va, pd_entry_t newpde) 911{ 912 u_long cr4; 913 914 if ((newpde & PG_PS) == 0) 915 /* Demotion: flush a specific 2MB page mapping. */ 916 invlpg(va); 917 else if ((newpde & PG_G) == 0) 918 /* 919 * Promotion: flush every 4KB page mapping from the TLB 920 * because there are too many to flush individually. 921 */ 922 invltlb(); 923 else { 924 /* 925 * Promotion: flush every 4KB page mapping from the TLB, 926 * including any global (PG_G) mappings. 927 */ 928 cr4 = rcr4(); 929 load_cr4(cr4 & ~CR4_PGE); 930 /* 931 * Although preemption at this point could be detrimental to 932 * performance, it would not lead to an error. PG_G is simply 933 * ignored if CR4.PGE is clear. Moreover, in case this block 934 * is re-entered, the load_cr4() either above or below will 935 * modify CR4.PGE flushing the TLB. 936 */ 937 load_cr4(cr4 | CR4_PGE); 938 } 939} 940#ifdef SMP 941/* 942 * For SMP, these functions have to use the IPI mechanism for coherence. 943 * 944 * N.B.: Before calling any of the following TLB invalidation functions, 945 * the calling processor must ensure that all stores updating a non- 946 * kernel page table are globally performed. Otherwise, another 947 * processor could cache an old, pre-update entry without being 948 * invalidated. This can happen one of two ways: (1) The pmap becomes 949 * active on another processor after its pm_active field is checked by 950 * one of the following functions but before a store updating the page 951 * table is globally performed. (2) The pmap becomes active on another 952 * processor before its pm_active field is checked but due to 953 * speculative loads one of the following functions stills reads the 954 * pmap as inactive on the other processor. 955 * 956 * The kernel page table is exempt because its pm_active field is 957 * immutable. The kernel page table is always active on every 958 * processor. 959 */ 960void 961pmap_invalidate_page(pmap_t pmap, vm_offset_t va) 962{ 963 cpuset_t other_cpus; 964 u_int cpuid; 965 966 sched_pin(); 967 if (pmap == kernel_pmap || !CPU_CMP(&pmap->pm_active, &all_cpus)) { 968 invlpg(va); 969 smp_invlpg(va); 970 } else { 971 cpuid = PCPU_GET(cpuid); 972 other_cpus = all_cpus; 973 CPU_CLR(cpuid, &other_cpus); 974 if (CPU_ISSET(cpuid, &pmap->pm_active)) 975 invlpg(va); 976 CPU_AND(&other_cpus, &pmap->pm_active); 977 if (!CPU_EMPTY(&other_cpus)) 978 smp_masked_invlpg(other_cpus, va); 979 } 980 sched_unpin(); 981} 982 983void 984pmap_invalidate_range(pmap_t pmap, vm_offset_t sva, vm_offset_t eva) 985{ 986 cpuset_t other_cpus; 987 vm_offset_t addr; 988 u_int cpuid; 989 990 sched_pin(); 991 if (pmap == kernel_pmap || !CPU_CMP(&pmap->pm_active, &all_cpus)) { 992 for (addr = sva; addr < eva; addr += PAGE_SIZE) 993 invlpg(addr); 994 smp_invlpg_range(sva, eva); 995 } else { 996 cpuid = PCPU_GET(cpuid); 997 other_cpus = all_cpus; 998 CPU_CLR(cpuid, &other_cpus); 999 if (CPU_ISSET(cpuid, &pmap->pm_active)) 1000 for (addr = sva; addr < eva; addr += PAGE_SIZE) 1001 invlpg(addr); 1002 CPU_AND(&other_cpus, &pmap->pm_active); 1003 if (!CPU_EMPTY(&other_cpus)) 1004 smp_masked_invlpg_range(other_cpus, sva, eva); 1005 } 1006 sched_unpin(); 1007} 1008 1009void 1010pmap_invalidate_all(pmap_t pmap) 1011{ 1012 cpuset_t other_cpus; 1013 u_int cpuid; 1014 1015 sched_pin(); 1016 if (pmap == kernel_pmap || !CPU_CMP(&pmap->pm_active, &all_cpus)) { 1017 invltlb(); 1018 smp_invltlb(); 1019 } else { 1020 cpuid = PCPU_GET(cpuid); 1021 other_cpus = all_cpus; 1022 CPU_CLR(cpuid, &other_cpus); 1023 if (CPU_ISSET(cpuid, &pmap->pm_active)) 1024 invltlb(); 1025 CPU_AND(&other_cpus, &pmap->pm_active); 1026 if (!CPU_EMPTY(&other_cpus)) 1027 smp_masked_invltlb(other_cpus); 1028 } 1029 sched_unpin(); 1030} 1031 1032void 1033pmap_invalidate_cache(void) 1034{ 1035 1036 sched_pin(); 1037 wbinvd(); 1038 smp_cache_flush(); 1039 sched_unpin(); 1040} 1041 1042struct pde_action { 1043 cpuset_t invalidate; /* processors that invalidate their TLB */ 1044 vm_offset_t va; 1045 pd_entry_t *pde; 1046 pd_entry_t newpde; 1047 u_int store; /* processor that updates the PDE */ 1048}; 1049 1050static void 1051pmap_update_pde_kernel(void *arg) 1052{ 1053 struct pde_action *act = arg; 1054 pd_entry_t *pde; 1055 pmap_t pmap; 1056 1057 if (act->store == PCPU_GET(cpuid)) { 1058 1059 /* 1060 * Elsewhere, this operation requires allpmaps_lock for 1061 * synchronization. Here, it does not because it is being 1062 * performed in the context of an all_cpus rendezvous. 1063 */ 1064 LIST_FOREACH(pmap, &allpmaps, pm_list) { 1065 pde = pmap_pde(pmap, act->va); 1066 pde_store(pde, act->newpde); 1067 } 1068 } 1069} 1070 1071static void 1072pmap_update_pde_user(void *arg) 1073{ 1074 struct pde_action *act = arg; 1075 1076 if (act->store == PCPU_GET(cpuid)) 1077 pde_store(act->pde, act->newpde); 1078} 1079 1080static void 1081pmap_update_pde_teardown(void *arg) 1082{ 1083 struct pde_action *act = arg; 1084 1085 if (CPU_ISSET(PCPU_GET(cpuid), &act->invalidate)) 1086 pmap_update_pde_invalidate(act->va, act->newpde); 1087} 1088 1089/* 1090 * Change the page size for the specified virtual address in a way that 1091 * prevents any possibility of the TLB ever having two entries that map the 1092 * same virtual address using different page sizes. This is the recommended 1093 * workaround for Erratum 383 on AMD Family 10h processors. It prevents a 1094 * machine check exception for a TLB state that is improperly diagnosed as a 1095 * hardware error. 1096 */ 1097static void 1098pmap_update_pde(pmap_t pmap, vm_offset_t va, pd_entry_t *pde, pd_entry_t newpde) 1099{ 1100 struct pde_action act; 1101 cpuset_t active, other_cpus; 1102 u_int cpuid; 1103 1104 sched_pin(); 1105 cpuid = PCPU_GET(cpuid); 1106 other_cpus = all_cpus; 1107 CPU_CLR(cpuid, &other_cpus); 1108 if (pmap == kernel_pmap) 1109 active = all_cpus; 1110 else 1111 active = pmap->pm_active; 1112 if (CPU_OVERLAP(&active, &other_cpus)) { 1113 act.store = cpuid; 1114 act.invalidate = active; 1115 act.va = va; 1116 act.pde = pde; 1117 act.newpde = newpde; 1118 CPU_SET(cpuid, &active); 1119 smp_rendezvous_cpus(active, 1120 smp_no_rendevous_barrier, pmap == kernel_pmap ? 1121 pmap_update_pde_kernel : pmap_update_pde_user, 1122 pmap_update_pde_teardown, &act); 1123 } else { 1124 if (pmap == kernel_pmap) 1125 pmap_kenter_pde(va, newpde); 1126 else 1127 pde_store(pde, newpde); 1128 if (CPU_ISSET(cpuid, &active)) 1129 pmap_update_pde_invalidate(va, newpde); 1130 } 1131 sched_unpin(); 1132} 1133#else /* !SMP */ 1134/* 1135 * Normal, non-SMP, 486+ invalidation functions. 1136 * We inline these within pmap.c for speed. 1137 */ 1138PMAP_INLINE void 1139pmap_invalidate_page(pmap_t pmap, vm_offset_t va) 1140{ 1141 1142 if (pmap == kernel_pmap || !CPU_EMPTY(&pmap->pm_active)) 1143 invlpg(va); 1144} 1145 1146PMAP_INLINE void 1147pmap_invalidate_range(pmap_t pmap, vm_offset_t sva, vm_offset_t eva) 1148{ 1149 vm_offset_t addr; 1150 1151 if (pmap == kernel_pmap || !CPU_EMPTY(&pmap->pm_active)) 1152 for (addr = sva; addr < eva; addr += PAGE_SIZE) 1153 invlpg(addr); 1154} 1155 1156PMAP_INLINE void 1157pmap_invalidate_all(pmap_t pmap) 1158{ 1159 1160 if (pmap == kernel_pmap || !CPU_EMPTY(&pmap->pm_active)) 1161 invltlb(); 1162} 1163 1164PMAP_INLINE void 1165pmap_invalidate_cache(void) 1166{ 1167 1168 wbinvd(); 1169} 1170 1171static void 1172pmap_update_pde(pmap_t pmap, vm_offset_t va, pd_entry_t *pde, pd_entry_t newpde) 1173{ 1174 1175 if (pmap == kernel_pmap) 1176 pmap_kenter_pde(va, newpde); 1177 else 1178 pde_store(pde, newpde); 1179 if (pmap == kernel_pmap || !CPU_EMPTY(&pmap->pm_active)) 1180 pmap_update_pde_invalidate(va, newpde); 1181} 1182#endif /* !SMP */ 1183 1184#define PMAP_CLFLUSH_THRESHOLD (2 * 1024 * 1024) 1185 1186void 1187pmap_invalidate_cache_range(vm_offset_t sva, vm_offset_t eva) 1188{ 1189 1190 KASSERT((sva & PAGE_MASK) == 0, 1191 ("pmap_invalidate_cache_range: sva not page-aligned")); 1192 KASSERT((eva & PAGE_MASK) == 0, 1193 ("pmap_invalidate_cache_range: eva not page-aligned")); 1194 1195 if (cpu_feature & CPUID_SS) 1196 ; /* If "Self Snoop" is supported, do nothing. */ 1197 else if ((cpu_feature & CPUID_CLFSH) != 0 && 1198 eva - sva < PMAP_CLFLUSH_THRESHOLD) { 1199 1200#ifdef DEV_APIC 1201 /* 1202 * XXX: Some CPUs fault, hang, or trash the local APIC 1203 * registers if we use CLFLUSH on the local APIC 1204 * range. The local APIC is always uncached, so we 1205 * don't need to flush for that range anyway. 1206 */ 1207 if (pmap_kextract(sva) == lapic_paddr) 1208 return; 1209#endif 1210 /* 1211 * Otherwise, do per-cache line flush. Use the mfence 1212 * instruction to insure that previous stores are 1213 * included in the write-back. The processor 1214 * propagates flush to other processors in the cache 1215 * coherence domain. 1216 */ 1217 mfence(); 1218 for (; sva < eva; sva += cpu_clflush_line_size) 1219 clflush(sva); 1220 mfence(); 1221 } else { 1222 1223 /* 1224 * No targeted cache flush methods are supported by CPU, 1225 * or the supplied range is bigger than 2MB. 1226 * Globally invalidate cache. 1227 */ 1228 pmap_invalidate_cache(); 1229 } 1230} 1231 1232void 1233pmap_invalidate_cache_pages(vm_page_t *pages, int count) 1234{ 1235 int i; 1236 1237 if (count >= PMAP_CLFLUSH_THRESHOLD / PAGE_SIZE || 1238 (cpu_feature & CPUID_CLFSH) == 0) { 1239 pmap_invalidate_cache(); 1240 } else { 1241 for (i = 0; i < count; i++) 1242 pmap_flush_page(pages[i]); 1243 } 1244} 1245 1246/* 1247 * Are we current address space or kernel? N.B. We return FALSE when 1248 * a pmap's page table is in use because a kernel thread is borrowing 1249 * it. The borrowed page table can change spontaneously, making any 1250 * dependence on its continued use subject to a race condition. 1251 */ 1252static __inline int 1253pmap_is_current(pmap_t pmap) 1254{ 1255 1256 return (pmap == kernel_pmap || 1257 (pmap == vmspace_pmap(curthread->td_proc->p_vmspace) && 1258 (pmap->pm_pdir[PTDPTDI] & PG_FRAME) == (PTDpde[0] & PG_FRAME))); 1259} 1260 1261/* 1262 * If the given pmap is not the current or kernel pmap, the returned pte must 1263 * be released by passing it to pmap_pte_release(). 1264 */ 1265pt_entry_t * 1266pmap_pte(pmap_t pmap, vm_offset_t va) 1267{ 1268 pd_entry_t newpf; 1269 pd_entry_t *pde; 1270 1271 pde = pmap_pde(pmap, va); 1272 if (*pde & PG_PS) 1273 return (pde); 1274 if (*pde != 0) { 1275 /* are we current address space or kernel? */ 1276 if (pmap_is_current(pmap)) 1277 return (vtopte(va)); 1278 mtx_lock(&PMAP2mutex); 1279 newpf = *pde & PG_FRAME; 1280 if ((*PMAP2 & PG_FRAME) != newpf) { 1281 *PMAP2 = newpf | PG_RW | PG_V | PG_A | PG_M; 1282 pmap_invalidate_page(kernel_pmap, (vm_offset_t)PADDR2); 1283 } 1284 return (PADDR2 + (i386_btop(va) & (NPTEPG - 1))); 1285 } 1286 return (NULL); 1287} 1288 1289/* 1290 * Releases a pte that was obtained from pmap_pte(). Be prepared for the pte 1291 * being NULL. 1292 */ 1293static __inline void 1294pmap_pte_release(pt_entry_t *pte) 1295{ 1296 1297 if ((pt_entry_t *)((vm_offset_t)pte & ~PAGE_MASK) == PADDR2) 1298 mtx_unlock(&PMAP2mutex); 1299} 1300 1301static __inline void 1302invlcaddr(void *caddr) 1303{ 1304 1305 invlpg((u_int)caddr); 1306} 1307 1308/* 1309 * Super fast pmap_pte routine best used when scanning 1310 * the pv lists. This eliminates many coarse-grained 1311 * invltlb calls. Note that many of the pv list 1312 * scans are across different pmaps. It is very wasteful 1313 * to do an entire invltlb for checking a single mapping. 1314 * 1315 * If the given pmap is not the current pmap, pvh_global_lock 1316 * must be held and curthread pinned to a CPU. 1317 */ 1318static pt_entry_t * 1319pmap_pte_quick(pmap_t pmap, vm_offset_t va) 1320{ 1321 pd_entry_t newpf; 1322 pd_entry_t *pde; 1323 1324 pde = pmap_pde(pmap, va); 1325 if (*pde & PG_PS) 1326 return (pde); 1327 if (*pde != 0) { 1328 /* are we current address space or kernel? */ 1329 if (pmap_is_current(pmap)) 1330 return (vtopte(va)); 1331 rw_assert(&pvh_global_lock, RA_WLOCKED); 1332 KASSERT(curthread->td_pinned > 0, ("curthread not pinned")); 1333 newpf = *pde & PG_FRAME; 1334 if ((*PMAP1 & PG_FRAME) != newpf) { 1335 *PMAP1 = newpf | PG_RW | PG_V | PG_A | PG_M; 1336#ifdef SMP 1337 PMAP1cpu = PCPU_GET(cpuid); 1338#endif 1339 invlcaddr(PADDR1); 1340 PMAP1changed++; 1341 } else 1342#ifdef SMP 1343 if (PMAP1cpu != PCPU_GET(cpuid)) { 1344 PMAP1cpu = PCPU_GET(cpuid); 1345 invlcaddr(PADDR1); 1346 PMAP1changedcpu++; 1347 } else 1348#endif 1349 PMAP1unchanged++; 1350 return (PADDR1 + (i386_btop(va) & (NPTEPG - 1))); 1351 } 1352 return (0); 1353} 1354 1355/* 1356 * Routine: pmap_extract 1357 * Function: 1358 * Extract the physical page address associated 1359 * with the given map/virtual_address pair. 1360 */ 1361vm_paddr_t 1362pmap_extract(pmap_t pmap, vm_offset_t va) 1363{ 1364 vm_paddr_t rtval; 1365 pt_entry_t *pte; 1366 pd_entry_t pde; 1367 1368 rtval = 0; 1369 PMAP_LOCK(pmap); 1370 pde = pmap->pm_pdir[va >> PDRSHIFT]; 1371 if (pde != 0) { 1372 if ((pde & PG_PS) != 0) 1373 rtval = (pde & PG_PS_FRAME) | (va & PDRMASK); 1374 else { 1375 pte = pmap_pte(pmap, va); 1376 rtval = (*pte & PG_FRAME) | (va & PAGE_MASK); 1377 pmap_pte_release(pte); 1378 } 1379 } 1380 PMAP_UNLOCK(pmap); 1381 return (rtval); 1382} 1383 1384/* 1385 * Routine: pmap_extract_and_hold 1386 * Function: 1387 * Atomically extract and hold the physical page 1388 * with the given pmap and virtual address pair 1389 * if that mapping permits the given protection. 1390 */ 1391vm_page_t 1392pmap_extract_and_hold(pmap_t pmap, vm_offset_t va, vm_prot_t prot) 1393{ 1394 pd_entry_t pde; 1395 pt_entry_t pte, *ptep; 1396 vm_page_t m; 1397 vm_paddr_t pa; 1398 1399 pa = 0; 1400 m = NULL; 1401 PMAP_LOCK(pmap); 1402retry: 1403 pde = *pmap_pde(pmap, va); 1404 if (pde != 0) { 1405 if (pde & PG_PS) { 1406 if ((pde & PG_RW) || (prot & VM_PROT_WRITE) == 0) { 1407 if (vm_page_pa_tryrelock(pmap, (pde & 1408 PG_PS_FRAME) | (va & PDRMASK), &pa)) 1409 goto retry; 1410 m = PHYS_TO_VM_PAGE((pde & PG_PS_FRAME) | 1411 (va & PDRMASK)); 1412 vm_page_hold(m); 1413 } 1414 } else { 1415 ptep = pmap_pte(pmap, va); 1416 pte = *ptep; 1417 pmap_pte_release(ptep); 1418 if (pte != 0 && 1419 ((pte & PG_RW) || (prot & VM_PROT_WRITE) == 0)) { 1420 if (vm_page_pa_tryrelock(pmap, pte & PG_FRAME, 1421 &pa)) 1422 goto retry; 1423 m = PHYS_TO_VM_PAGE(pte & PG_FRAME); 1424 vm_page_hold(m); 1425 } 1426 } 1427 } 1428 PA_UNLOCK_COND(pa); 1429 PMAP_UNLOCK(pmap); 1430 return (m); 1431} 1432 1433/*************************************************** 1434 * Low level mapping routines..... 1435 ***************************************************/ 1436 1437/* 1438 * Add a wired page to the kva. 1439 * Note: not SMP coherent. 1440 * 1441 * This function may be used before pmap_bootstrap() is called. 1442 */ 1443PMAP_INLINE void 1444pmap_kenter(vm_offset_t va, vm_paddr_t pa) 1445{ 1446 pt_entry_t *pte; 1447 1448 pte = vtopte(va); 1449 pte_store(pte, pa | PG_RW | PG_V | pgeflag); 1450} 1451 1452static __inline void 1453pmap_kenter_attr(vm_offset_t va, vm_paddr_t pa, int mode) 1454{ 1455 pt_entry_t *pte; 1456 1457 pte = vtopte(va); 1458 pte_store(pte, pa | PG_RW | PG_V | pgeflag | pmap_cache_bits(mode, 0)); 1459} 1460 1461/* 1462 * Remove a page from the kernel pagetables. 1463 * Note: not SMP coherent. 1464 * 1465 * This function may be used before pmap_bootstrap() is called. 1466 */ 1467PMAP_INLINE void 1468pmap_kremove(vm_offset_t va) 1469{ 1470 pt_entry_t *pte; 1471 1472 pte = vtopte(va); 1473 pte_clear(pte); 1474} 1475 1476/* 1477 * Used to map a range of physical addresses into kernel 1478 * virtual address space. 1479 * 1480 * The value passed in '*virt' is a suggested virtual address for 1481 * the mapping. Architectures which can support a direct-mapped 1482 * physical to virtual region can return the appropriate address 1483 * within that region, leaving '*virt' unchanged. Other 1484 * architectures should map the pages starting at '*virt' and 1485 * update '*virt' with the first usable address after the mapped 1486 * region. 1487 */ 1488vm_offset_t 1489pmap_map(vm_offset_t *virt, vm_paddr_t start, vm_paddr_t end, int prot) 1490{ 1491 vm_offset_t va, sva; 1492 vm_paddr_t superpage_offset; 1493 pd_entry_t newpde; 1494 1495 va = *virt; 1496 /* 1497 * Does the physical address range's size and alignment permit at 1498 * least one superpage mapping to be created? 1499 */ 1500 superpage_offset = start & PDRMASK; 1501 if ((end - start) - ((NBPDR - superpage_offset) & PDRMASK) >= NBPDR) { 1502 /* 1503 * Increase the starting virtual address so that its alignment 1504 * does not preclude the use of superpage mappings. 1505 */ 1506 if ((va & PDRMASK) < superpage_offset) 1507 va = (va & ~PDRMASK) + superpage_offset; 1508 else if ((va & PDRMASK) > superpage_offset) 1509 va = ((va + PDRMASK) & ~PDRMASK) + superpage_offset; 1510 } 1511 sva = va; 1512 while (start < end) { 1513 if ((start & PDRMASK) == 0 && end - start >= NBPDR && 1514 pseflag) { 1515 KASSERT((va & PDRMASK) == 0, 1516 ("pmap_map: misaligned va %#x", va)); 1517 newpde = start | PG_PS | pgeflag | PG_RW | PG_V; 1518 pmap_kenter_pde(va, newpde); 1519 va += NBPDR; 1520 start += NBPDR; 1521 } else { 1522 pmap_kenter(va, start); 1523 va += PAGE_SIZE; 1524 start += PAGE_SIZE; 1525 } 1526 } 1527 pmap_invalidate_range(kernel_pmap, sva, va); 1528 *virt = va; 1529 return (sva); 1530} 1531 1532 1533/* 1534 * Add a list of wired pages to the kva 1535 * this routine is only used for temporary 1536 * kernel mappings that do not need to have 1537 * page modification or references recorded. 1538 * Note that old mappings are simply written 1539 * over. The page *must* be wired. 1540 * Note: SMP coherent. Uses a ranged shootdown IPI. 1541 */ 1542void 1543pmap_qenter(vm_offset_t sva, vm_page_t *ma, int count) 1544{ 1545 pt_entry_t *endpte, oldpte, pa, *pte; 1546 vm_page_t m; 1547 1548 oldpte = 0; 1549 pte = vtopte(sva); 1550 endpte = pte + count; 1551 while (pte < endpte) { 1552 m = *ma++; 1553 pa = VM_PAGE_TO_PHYS(m) | pmap_cache_bits(m->md.pat_mode, 0); 1554 if ((*pte & (PG_FRAME | PG_PTE_CACHE)) != pa) { 1555 oldpte |= *pte; 1556 pte_store(pte, pa | pgeflag | PG_RW | PG_V); 1557 } 1558 pte++; 1559 } 1560 if (__predict_false((oldpte & PG_V) != 0)) 1561 pmap_invalidate_range(kernel_pmap, sva, sva + count * 1562 PAGE_SIZE); 1563} 1564 1565/* 1566 * This routine tears out page mappings from the 1567 * kernel -- it is meant only for temporary mappings. 1568 * Note: SMP coherent. Uses a ranged shootdown IPI. 1569 */ 1570void 1571pmap_qremove(vm_offset_t sva, int count) 1572{ 1573 vm_offset_t va; 1574 1575 va = sva; 1576 while (count-- > 0) { 1577 pmap_kremove(va); 1578 va += PAGE_SIZE; 1579 } 1580 pmap_invalidate_range(kernel_pmap, sva, va); 1581} 1582 1583/*************************************************** 1584 * Page table page management routines..... 1585 ***************************************************/ 1586static __inline void 1587pmap_free_zero_pages(vm_page_t free) 1588{ 1589 vm_page_t m; 1590 1591 while (free != NULL) { 1592 m = free; 1593 free = m->right; 1594 /* Preserve the page's PG_ZERO setting. */ 1595 vm_page_free_toq(m); 1596 } 1597} 1598 1599/* 1600 * Schedule the specified unused page table page to be freed. Specifically, 1601 * add the page to the specified list of pages that will be released to the 1602 * physical memory manager after the TLB has been updated. 1603 */ 1604static __inline void 1605pmap_add_delayed_free_list(vm_page_t m, vm_page_t *free, boolean_t set_PG_ZERO) 1606{ 1607 1608 if (set_PG_ZERO) 1609 m->flags |= PG_ZERO; 1610 else 1611 m->flags &= ~PG_ZERO; 1612 m->right = *free; 1613 *free = m; 1614} 1615 1616/* 1617 * Inserts the specified page table page into the specified pmap's collection 1618 * of idle page table pages. Each of a pmap's page table pages is responsible 1619 * for mapping a distinct range of virtual addresses. The pmap's collection is 1620 * ordered by this virtual address range. 1621 */ 1622static void 1623pmap_insert_pt_page(pmap_t pmap, vm_page_t mpte) 1624{ 1625 vm_page_t root; 1626 1627 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 1628 root = pmap->pm_root; 1629 if (root == NULL) { 1630 mpte->left = NULL; 1631 mpte->right = NULL; 1632 } else { 1633 root = vm_page_splay(mpte->pindex, root); 1634 if (mpte->pindex < root->pindex) { 1635 mpte->left = root->left; 1636 mpte->right = root; 1637 root->left = NULL; 1638 } else if (mpte->pindex == root->pindex) 1639 panic("pmap_insert_pt_page: pindex already inserted"); 1640 else { 1641 mpte->right = root->right; 1642 mpte->left = root; 1643 root->right = NULL; 1644 } 1645 } 1646 pmap->pm_root = mpte; 1647} 1648 1649/* 1650 * Looks for a page table page mapping the specified virtual address in the 1651 * specified pmap's collection of idle page table pages. Returns NULL if there 1652 * is no page table page corresponding to the specified virtual address. 1653 */ 1654static vm_page_t 1655pmap_lookup_pt_page(pmap_t pmap, vm_offset_t va) 1656{ 1657 vm_page_t mpte; 1658 vm_pindex_t pindex = va >> PDRSHIFT; 1659 1660 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 1661 if ((mpte = pmap->pm_root) != NULL && mpte->pindex != pindex) { 1662 mpte = vm_page_splay(pindex, mpte); 1663 if ((pmap->pm_root = mpte)->pindex != pindex) 1664 mpte = NULL; 1665 } 1666 return (mpte); 1667} 1668 1669/* 1670 * Removes the specified page table page from the specified pmap's collection 1671 * of idle page table pages. The specified page table page must be a member of 1672 * the pmap's collection. 1673 */ 1674static void 1675pmap_remove_pt_page(pmap_t pmap, vm_page_t mpte) 1676{ 1677 vm_page_t root; 1678 1679 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 1680 if (mpte != pmap->pm_root) 1681 vm_page_splay(mpte->pindex, pmap->pm_root); 1682 if (mpte->left == NULL) 1683 root = mpte->right; 1684 else { 1685 root = vm_page_splay(mpte->pindex, mpte->left); 1686 root->right = mpte->right; 1687 } 1688 pmap->pm_root = root; 1689} 1690 1691/* 1692 * Decrements a page table page's wire count, which is used to record the 1693 * number of valid page table entries within the page. If the wire count 1694 * drops to zero, then the page table page is unmapped. Returns TRUE if the 1695 * page table page was unmapped and FALSE otherwise. 1696 */ 1697static inline boolean_t 1698pmap_unwire_ptp(pmap_t pmap, vm_page_t m, vm_page_t *free) 1699{ 1700 1701 --m->wire_count; 1702 if (m->wire_count == 0) { 1703 _pmap_unwire_ptp(pmap, m, free); 1704 return (TRUE); 1705 } else 1706 return (FALSE); 1707} 1708 1709static void 1710_pmap_unwire_ptp(pmap_t pmap, vm_page_t m, vm_page_t *free) 1711{ 1712 vm_offset_t pteva; 1713 1714 /* 1715 * unmap the page table page 1716 */ 1717 pmap->pm_pdir[m->pindex] = 0; 1718 --pmap->pm_stats.resident_count; 1719 1720 /* 1721 * This is a release store so that the ordinary store unmapping 1722 * the page table page is globally performed before TLB shoot- 1723 * down is begun. 1724 */ 1725 atomic_subtract_rel_int(&cnt.v_wire_count, 1); 1726 1727 /* 1728 * Do an invltlb to make the invalidated mapping 1729 * take effect immediately. 1730 */ 1731 pteva = VM_MAXUSER_ADDRESS + i386_ptob(m->pindex); 1732 pmap_invalidate_page(pmap, pteva); 1733 1734 /* 1735 * Put page on a list so that it is released after 1736 * *ALL* TLB shootdown is done 1737 */ 1738 pmap_add_delayed_free_list(m, free, TRUE); 1739} 1740 1741/* 1742 * After removing a page table entry, this routine is used to 1743 * conditionally free the page, and manage the hold/wire counts. 1744 */ 1745static int 1746pmap_unuse_pt(pmap_t pmap, vm_offset_t va, vm_page_t *free) 1747{ 1748 pd_entry_t ptepde; 1749 vm_page_t mpte; 1750 1751 if (va >= VM_MAXUSER_ADDRESS) 1752 return (0); 1753 ptepde = *pmap_pde(pmap, va); 1754 mpte = PHYS_TO_VM_PAGE(ptepde & PG_FRAME); 1755 return (pmap_unwire_ptp(pmap, mpte, free)); 1756} 1757 1758/* 1759 * Initialize the pmap for the swapper process. 1760 */ 1761void 1762pmap_pinit0(pmap_t pmap) 1763{ 1764 1765 PMAP_LOCK_INIT(pmap); 1766 /* 1767 * Since the page table directory is shared with the kernel pmap, 1768 * which is already included in the list "allpmaps", this pmap does 1769 * not need to be inserted into that list. 1770 */ 1771 pmap->pm_pdir = (pd_entry_t *)(KERNBASE + (vm_offset_t)IdlePTD); 1772#ifdef PAE 1773 pmap->pm_pdpt = (pdpt_entry_t *)(KERNBASE + (vm_offset_t)IdlePDPT); 1774#endif 1775 pmap->pm_root = NULL; 1776 CPU_ZERO(&pmap->pm_active); 1777 PCPU_SET(curpmap, pmap); 1778 TAILQ_INIT(&pmap->pm_pvchunk); 1779 bzero(&pmap->pm_stats, sizeof pmap->pm_stats); 1780} 1781 1782/* 1783 * Initialize a preallocated and zeroed pmap structure, 1784 * such as one in a vmspace structure. 1785 */ 1786int 1787pmap_pinit(pmap_t pmap) 1788{ 1789 vm_page_t m, ptdpg[NPGPTD]; 1790 vm_paddr_t pa; 1791 int i; 1792 1793 PMAP_LOCK_INIT(pmap); 1794 1795 /* 1796 * No need to allocate page table space yet but we do need a valid 1797 * page directory table. 1798 */ 1799 if (pmap->pm_pdir == NULL) { 1800 pmap->pm_pdir = (pd_entry_t *)kmem_alloc_nofault(kernel_map, 1801 NBPTD); 1802 if (pmap->pm_pdir == NULL) { 1803 PMAP_LOCK_DESTROY(pmap); 1804 return (0); 1805 } 1806#ifdef PAE 1807 pmap->pm_pdpt = uma_zalloc(pdptzone, M_WAITOK | M_ZERO); 1808 KASSERT(((vm_offset_t)pmap->pm_pdpt & 1809 ((NPGPTD * sizeof(pdpt_entry_t)) - 1)) == 0, 1810 ("pmap_pinit: pdpt misaligned")); 1811 KASSERT(pmap_kextract((vm_offset_t)pmap->pm_pdpt) < (4ULL<<30), 1812 ("pmap_pinit: pdpt above 4g")); 1813#endif 1814 pmap->pm_root = NULL; 1815 } 1816 KASSERT(pmap->pm_root == NULL, 1817 ("pmap_pinit: pmap has reserved page table page(s)")); 1818 1819 /* 1820 * allocate the page directory page(s) 1821 */ 1822 for (i = 0; i < NPGPTD;) { 1823 m = vm_page_alloc(NULL, 0, VM_ALLOC_NORMAL | VM_ALLOC_NOOBJ | 1824 VM_ALLOC_WIRED | VM_ALLOC_ZERO); 1825 if (m == NULL) 1826 VM_WAIT; 1827 else { 1828 ptdpg[i++] = m; 1829 } 1830 } 1831 1832 pmap_qenter((vm_offset_t)pmap->pm_pdir, ptdpg, NPGPTD); 1833 1834 for (i = 0; i < NPGPTD; i++) 1835 if ((ptdpg[i]->flags & PG_ZERO) == 0) 1836 pagezero(pmap->pm_pdir + (i * NPDEPG)); 1837 1838 mtx_lock_spin(&allpmaps_lock); 1839 LIST_INSERT_HEAD(&allpmaps, pmap, pm_list); 1840 /* Copy the kernel page table directory entries. */ 1841 bcopy(PTD + KPTDI, pmap->pm_pdir + KPTDI, nkpt * sizeof(pd_entry_t)); 1842 mtx_unlock_spin(&allpmaps_lock); 1843 1844 /* install self-referential address mapping entry(s) */ 1845 for (i = 0; i < NPGPTD; i++) { 1846 pa = VM_PAGE_TO_PHYS(ptdpg[i]); 1847 pmap->pm_pdir[PTDPTDI + i] = pa | PG_V | PG_RW | PG_A | PG_M; 1848#ifdef PAE 1849 pmap->pm_pdpt[i] = pa | PG_V; 1850#endif 1851 } 1852 1853 CPU_ZERO(&pmap->pm_active); 1854 TAILQ_INIT(&pmap->pm_pvchunk); 1855 bzero(&pmap->pm_stats, sizeof pmap->pm_stats); 1856 1857 return (1); 1858} 1859 1860/* 1861 * this routine is called if the page table page is not 1862 * mapped correctly. 1863 */ 1864static vm_page_t 1865_pmap_allocpte(pmap_t pmap, u_int ptepindex, int flags) 1866{ 1867 vm_paddr_t ptepa; 1868 vm_page_t m; 1869 1870 KASSERT((flags & (M_NOWAIT | M_WAITOK)) == M_NOWAIT || 1871 (flags & (M_NOWAIT | M_WAITOK)) == M_WAITOK, 1872 ("_pmap_allocpte: flags is neither M_NOWAIT nor M_WAITOK")); 1873 1874 /* 1875 * Allocate a page table page. 1876 */ 1877 if ((m = vm_page_alloc(NULL, ptepindex, VM_ALLOC_NOOBJ | 1878 VM_ALLOC_WIRED | VM_ALLOC_ZERO)) == NULL) { 1879 if (flags & M_WAITOK) { 1880 PMAP_UNLOCK(pmap); 1881 rw_wunlock(&pvh_global_lock); 1882 VM_WAIT; 1883 rw_wlock(&pvh_global_lock); 1884 PMAP_LOCK(pmap); 1885 } 1886 1887 /* 1888 * Indicate the need to retry. While waiting, the page table 1889 * page may have been allocated. 1890 */ 1891 return (NULL); 1892 } 1893 if ((m->flags & PG_ZERO) == 0) 1894 pmap_zero_page(m); 1895 1896 /* 1897 * Map the pagetable page into the process address space, if 1898 * it isn't already there. 1899 */ 1900 1901 pmap->pm_stats.resident_count++; 1902 1903 ptepa = VM_PAGE_TO_PHYS(m); 1904 pmap->pm_pdir[ptepindex] = 1905 (pd_entry_t) (ptepa | PG_U | PG_RW | PG_V | PG_A | PG_M); 1906 1907 return (m); 1908} 1909 1910static vm_page_t 1911pmap_allocpte(pmap_t pmap, vm_offset_t va, int flags) 1912{ 1913 u_int ptepindex; 1914 pd_entry_t ptepa; 1915 vm_page_t m; 1916 1917 KASSERT((flags & (M_NOWAIT | M_WAITOK)) == M_NOWAIT || 1918 (flags & (M_NOWAIT | M_WAITOK)) == M_WAITOK, 1919 ("pmap_allocpte: flags is neither M_NOWAIT nor M_WAITOK")); 1920 1921 /* 1922 * Calculate pagetable page index 1923 */ 1924 ptepindex = va >> PDRSHIFT; 1925retry: 1926 /* 1927 * Get the page directory entry 1928 */ 1929 ptepa = pmap->pm_pdir[ptepindex]; 1930 1931 /* 1932 * This supports switching from a 4MB page to a 1933 * normal 4K page. 1934 */ 1935 if (ptepa & PG_PS) { 1936 (void)pmap_demote_pde(pmap, &pmap->pm_pdir[ptepindex], va); 1937 ptepa = pmap->pm_pdir[ptepindex]; 1938 } 1939 1940 /* 1941 * If the page table page is mapped, we just increment the 1942 * hold count, and activate it. 1943 */ 1944 if (ptepa) { 1945 m = PHYS_TO_VM_PAGE(ptepa & PG_FRAME); 1946 m->wire_count++; 1947 } else { 1948 /* 1949 * Here if the pte page isn't mapped, or if it has 1950 * been deallocated. 1951 */ 1952 m = _pmap_allocpte(pmap, ptepindex, flags); 1953 if (m == NULL && (flags & M_WAITOK)) 1954 goto retry; 1955 } 1956 return (m); 1957} 1958 1959 1960/*************************************************** 1961* Pmap allocation/deallocation routines. 1962 ***************************************************/ 1963 1964#ifdef SMP 1965/* 1966 * Deal with a SMP shootdown of other users of the pmap that we are 1967 * trying to dispose of. This can be a bit hairy. 1968 */ 1969static cpuset_t *lazymask; 1970static u_int lazyptd; 1971static volatile u_int lazywait; 1972 1973void pmap_lazyfix_action(void); 1974 1975void 1976pmap_lazyfix_action(void) 1977{ 1978 1979#ifdef COUNT_IPIS 1980 (*ipi_lazypmap_counts[PCPU_GET(cpuid)])++; 1981#endif 1982 if (rcr3() == lazyptd) 1983 load_cr3(curpcb->pcb_cr3); 1984 CPU_CLR_ATOMIC(PCPU_GET(cpuid), lazymask); 1985 atomic_store_rel_int(&lazywait, 1); 1986} 1987 1988static void 1989pmap_lazyfix_self(u_int cpuid) 1990{ 1991 1992 if (rcr3() == lazyptd) 1993 load_cr3(curpcb->pcb_cr3); 1994 CPU_CLR_ATOMIC(cpuid, lazymask); 1995} 1996 1997 1998static void 1999pmap_lazyfix(pmap_t pmap) 2000{ 2001 cpuset_t mymask, mask; 2002 u_int cpuid, spins; 2003 int lsb; 2004 2005 mask = pmap->pm_active; 2006 while (!CPU_EMPTY(&mask)) { 2007 spins = 50000000; 2008 2009 /* Find least significant set bit. */ 2010 lsb = cpusetobj_ffs(&mask); 2011 MPASS(lsb != 0); 2012 lsb--; 2013 CPU_SETOF(lsb, &mask); 2014 mtx_lock_spin(&smp_ipi_mtx); 2015#ifdef PAE 2016 lazyptd = vtophys(pmap->pm_pdpt); 2017#else 2018 lazyptd = vtophys(pmap->pm_pdir); 2019#endif 2020 cpuid = PCPU_GET(cpuid); 2021 2022 /* Use a cpuset just for having an easy check. */ 2023 CPU_SETOF(cpuid, &mymask); 2024 if (!CPU_CMP(&mask, &mymask)) { 2025 lazymask = &pmap->pm_active; 2026 pmap_lazyfix_self(cpuid); 2027 } else { 2028 atomic_store_rel_int((u_int *)&lazymask, 2029 (u_int)&pmap->pm_active); 2030 atomic_store_rel_int(&lazywait, 0); 2031 ipi_selected(mask, IPI_LAZYPMAP); 2032 while (lazywait == 0) { 2033 ia32_pause(); 2034 if (--spins == 0) 2035 break; 2036 } 2037 } 2038 mtx_unlock_spin(&smp_ipi_mtx); 2039 if (spins == 0) 2040 printf("pmap_lazyfix: spun for 50000000\n"); 2041 mask = pmap->pm_active; 2042 } 2043} 2044 2045#else /* SMP */ 2046 2047/* 2048 * Cleaning up on uniprocessor is easy. For various reasons, we're 2049 * unlikely to have to even execute this code, including the fact 2050 * that the cleanup is deferred until the parent does a wait(2), which 2051 * means that another userland process has run. 2052 */ 2053static void 2054pmap_lazyfix(pmap_t pmap) 2055{ 2056 u_int cr3; 2057 2058 cr3 = vtophys(pmap->pm_pdir); 2059 if (cr3 == rcr3()) { 2060 load_cr3(curpcb->pcb_cr3); 2061 CPU_CLR(PCPU_GET(cpuid), &pmap->pm_active); 2062 } 2063} 2064#endif /* SMP */ 2065 2066/* 2067 * Release any resources held by the given physical map. 2068 * Called when a pmap initialized by pmap_pinit is being released. 2069 * Should only be called if the map contains no valid mappings. 2070 */ 2071void 2072pmap_release(pmap_t pmap) 2073{ 2074 vm_page_t m, ptdpg[NPGPTD]; 2075 int i; 2076 2077 KASSERT(pmap->pm_stats.resident_count == 0, 2078 ("pmap_release: pmap resident count %ld != 0", 2079 pmap->pm_stats.resident_count)); 2080 KASSERT(pmap->pm_root == NULL, 2081 ("pmap_release: pmap has reserved page table page(s)")); 2082 2083 pmap_lazyfix(pmap); 2084 mtx_lock_spin(&allpmaps_lock); 2085 LIST_REMOVE(pmap, pm_list); 2086 mtx_unlock_spin(&allpmaps_lock); 2087 2088 for (i = 0; i < NPGPTD; i++) 2089 ptdpg[i] = PHYS_TO_VM_PAGE(pmap->pm_pdir[PTDPTDI + i] & 2090 PG_FRAME); 2091 2092 bzero(pmap->pm_pdir + PTDPTDI, (nkpt + NPGPTD) * 2093 sizeof(*pmap->pm_pdir)); 2094 2095 pmap_qremove((vm_offset_t)pmap->pm_pdir, NPGPTD); 2096 2097 for (i = 0; i < NPGPTD; i++) { 2098 m = ptdpg[i]; 2099#ifdef PAE 2100 KASSERT(VM_PAGE_TO_PHYS(m) == (pmap->pm_pdpt[i] & PG_FRAME), 2101 ("pmap_release: got wrong ptd page")); 2102#endif 2103 m->wire_count--; 2104 atomic_subtract_int(&cnt.v_wire_count, 1); 2105 vm_page_free_zero(m); 2106 } 2107 PMAP_LOCK_DESTROY(pmap); 2108} 2109 2110static int 2111kvm_size(SYSCTL_HANDLER_ARGS) 2112{ 2113 unsigned long ksize = VM_MAX_KERNEL_ADDRESS - KERNBASE; 2114 2115 return (sysctl_handle_long(oidp, &ksize, 0, req)); 2116} 2117SYSCTL_PROC(_vm, OID_AUTO, kvm_size, CTLTYPE_LONG|CTLFLAG_RD, 2118 0, 0, kvm_size, "IU", "Size of KVM"); 2119 2120static int 2121kvm_free(SYSCTL_HANDLER_ARGS) 2122{ 2123 unsigned long kfree = VM_MAX_KERNEL_ADDRESS - kernel_vm_end; 2124 2125 return (sysctl_handle_long(oidp, &kfree, 0, req)); 2126} 2127SYSCTL_PROC(_vm, OID_AUTO, kvm_free, CTLTYPE_LONG|CTLFLAG_RD, 2128 0, 0, kvm_free, "IU", "Amount of KVM free"); 2129 2130/* 2131 * grow the number of kernel page table entries, if needed 2132 */ 2133void 2134pmap_growkernel(vm_offset_t addr) 2135{ 2136 vm_paddr_t ptppaddr; 2137 vm_page_t nkpg; 2138 pd_entry_t newpdir; 2139 2140 mtx_assert(&kernel_map->system_mtx, MA_OWNED); 2141 addr = roundup2(addr, NBPDR); 2142 if (addr - 1 >= kernel_map->max_offset) 2143 addr = kernel_map->max_offset; 2144 while (kernel_vm_end < addr) { 2145 if (pdir_pde(PTD, kernel_vm_end)) { 2146 kernel_vm_end = (kernel_vm_end + NBPDR) & ~PDRMASK; 2147 if (kernel_vm_end - 1 >= kernel_map->max_offset) { 2148 kernel_vm_end = kernel_map->max_offset; 2149 break; 2150 } 2151 continue; 2152 } 2153 2154 nkpg = vm_page_alloc(NULL, kernel_vm_end >> PDRSHIFT, 2155 VM_ALLOC_INTERRUPT | VM_ALLOC_NOOBJ | VM_ALLOC_WIRED | 2156 VM_ALLOC_ZERO); 2157 if (nkpg == NULL) 2158 panic("pmap_growkernel: no memory to grow kernel"); 2159 2160 nkpt++; 2161 2162 if ((nkpg->flags & PG_ZERO) == 0) 2163 pmap_zero_page(nkpg); 2164 ptppaddr = VM_PAGE_TO_PHYS(nkpg); 2165 newpdir = (pd_entry_t) (ptppaddr | PG_V | PG_RW | PG_A | PG_M); 2166 pdir_pde(KPTD, kernel_vm_end) = pgeflag | newpdir; 2167 2168 pmap_kenter_pde(kernel_vm_end, newpdir); 2169 kernel_vm_end = (kernel_vm_end + NBPDR) & ~PDRMASK; 2170 if (kernel_vm_end - 1 >= kernel_map->max_offset) { 2171 kernel_vm_end = kernel_map->max_offset; 2172 break; 2173 } 2174 } 2175} 2176 2177 2178/*************************************************** 2179 * page management routines. 2180 ***************************************************/ 2181 2182CTASSERT(sizeof(struct pv_chunk) == PAGE_SIZE); 2183CTASSERT(_NPCM == 11); 2184CTASSERT(_NPCPV == 336); 2185 2186static __inline struct pv_chunk * 2187pv_to_chunk(pv_entry_t pv) 2188{ 2189 2190 return ((struct pv_chunk *)((uintptr_t)pv & ~(uintptr_t)PAGE_MASK)); 2191} 2192 2193#define PV_PMAP(pv) (pv_to_chunk(pv)->pc_pmap) 2194 2195#define PC_FREE0_9 0xfffffffful /* Free values for index 0 through 9 */ 2196#define PC_FREE10 0x0000fffful /* Free values for index 10 */ 2197 2198static const uint32_t pc_freemask[_NPCM] = { 2199 PC_FREE0_9, PC_FREE0_9, PC_FREE0_9, 2200 PC_FREE0_9, PC_FREE0_9, PC_FREE0_9, 2201 PC_FREE0_9, PC_FREE0_9, PC_FREE0_9, 2202 PC_FREE0_9, PC_FREE10 2203}; 2204 2205SYSCTL_INT(_vm_pmap, OID_AUTO, pv_entry_count, CTLFLAG_RD, &pv_entry_count, 0, 2206 "Current number of pv entries"); 2207 2208#ifdef PV_STATS 2209static int pc_chunk_count, pc_chunk_allocs, pc_chunk_frees, pc_chunk_tryfail; 2210 2211SYSCTL_INT(_vm_pmap, OID_AUTO, pc_chunk_count, CTLFLAG_RD, &pc_chunk_count, 0, 2212 "Current number of pv entry chunks"); 2213SYSCTL_INT(_vm_pmap, OID_AUTO, pc_chunk_allocs, CTLFLAG_RD, &pc_chunk_allocs, 0, 2214 "Current number of pv entry chunks allocated"); 2215SYSCTL_INT(_vm_pmap, OID_AUTO, pc_chunk_frees, CTLFLAG_RD, &pc_chunk_frees, 0, 2216 "Current number of pv entry chunks frees"); 2217SYSCTL_INT(_vm_pmap, OID_AUTO, pc_chunk_tryfail, CTLFLAG_RD, &pc_chunk_tryfail, 0, 2218 "Number of times tried to get a chunk page but failed."); 2219 2220static long pv_entry_frees, pv_entry_allocs; 2221static int pv_entry_spare; 2222 2223SYSCTL_LONG(_vm_pmap, OID_AUTO, pv_entry_frees, CTLFLAG_RD, &pv_entry_frees, 0, 2224 "Current number of pv entry frees"); 2225SYSCTL_LONG(_vm_pmap, OID_AUTO, pv_entry_allocs, CTLFLAG_RD, &pv_entry_allocs, 0, 2226 "Current number of pv entry allocs"); 2227SYSCTL_INT(_vm_pmap, OID_AUTO, pv_entry_spare, CTLFLAG_RD, &pv_entry_spare, 0, 2228 "Current number of spare pv entries"); 2229#endif 2230 2231/* 2232 * We are in a serious low memory condition. Resort to 2233 * drastic measures to free some pages so we can allocate 2234 * another pv entry chunk. 2235 */ 2236static vm_page_t 2237pmap_pv_reclaim(pmap_t locked_pmap) 2238{ 2239 struct pch newtail; 2240 struct pv_chunk *pc; 2241 struct md_page *pvh; 2242 pd_entry_t *pde; 2243 pmap_t pmap; 2244 pt_entry_t *pte, tpte; 2245 pv_entry_t pv; 2246 vm_offset_t va; 2247 vm_page_t free, m, m_pc; 2248 uint32_t inuse; 2249 int bit, field, freed; 2250 2251 PMAP_LOCK_ASSERT(locked_pmap, MA_OWNED); 2252 pmap = NULL; 2253 free = m_pc = NULL; 2254 TAILQ_INIT(&newtail); 2255 while ((pc = TAILQ_FIRST(&pv_chunks)) != NULL && (pv_vafree == 0 || 2256 free == NULL)) { 2257 TAILQ_REMOVE(&pv_chunks, pc, pc_lru); 2258 if (pmap != pc->pc_pmap) { 2259 if (pmap != NULL) { 2260 pmap_invalidate_all(pmap); 2261 if (pmap != locked_pmap) 2262 PMAP_UNLOCK(pmap); 2263 } 2264 pmap = pc->pc_pmap; 2265 /* Avoid deadlock and lock recursion. */ 2266 if (pmap > locked_pmap) 2267 PMAP_LOCK(pmap); 2268 else if (pmap != locked_pmap && !PMAP_TRYLOCK(pmap)) { 2269 pmap = NULL; 2270 TAILQ_INSERT_TAIL(&newtail, pc, pc_lru); 2271 continue; 2272 } 2273 } 2274 2275 /* 2276 * Destroy every non-wired, 4 KB page mapping in the chunk. 2277 */ 2278 freed = 0; 2279 for (field = 0; field < _NPCM; field++) { 2280 for (inuse = ~pc->pc_map[field] & pc_freemask[field]; 2281 inuse != 0; inuse &= ~(1UL << bit)) { 2282 bit = bsfl(inuse); 2283 pv = &pc->pc_pventry[field * 32 + bit]; 2284 va = pv->pv_va; 2285 pde = pmap_pde(pmap, va); 2286 if ((*pde & PG_PS) != 0) 2287 continue; 2288 pte = pmap_pte(pmap, va); 2289 tpte = *pte; 2290 if ((tpte & PG_W) == 0) 2291 tpte = pte_load_clear(pte); 2292 pmap_pte_release(pte); 2293 if ((tpte & PG_W) != 0) 2294 continue; 2295 KASSERT(tpte != 0, 2296 ("pmap_pv_reclaim: pmap %p va %x zero pte", 2297 pmap, va)); 2298 if ((tpte & PG_G) != 0) 2299 pmap_invalidate_page(pmap, va); 2300 m = PHYS_TO_VM_PAGE(tpte & PG_FRAME); 2301 if ((tpte & (PG_M | PG_RW)) == (PG_M | PG_RW)) 2302 vm_page_dirty(m); 2303 if ((tpte & PG_A) != 0) 2304 vm_page_aflag_set(m, PGA_REFERENCED); 2305 TAILQ_REMOVE(&m->md.pv_list, pv, pv_list); 2306 if (TAILQ_EMPTY(&m->md.pv_list) && 2307 (m->flags & PG_FICTITIOUS) == 0) { 2308 pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m)); 2309 if (TAILQ_EMPTY(&pvh->pv_list)) { 2310 vm_page_aflag_clear(m, 2311 PGA_WRITEABLE); 2312 } 2313 } 2314 pc->pc_map[field] |= 1UL << bit; 2315 pmap_unuse_pt(pmap, va, &free); 2316 freed++; 2317 } 2318 } 2319 if (freed == 0) { 2320 TAILQ_INSERT_TAIL(&newtail, pc, pc_lru); 2321 continue; 2322 } 2323 /* Every freed mapping is for a 4 KB page. */ 2324 pmap->pm_stats.resident_count -= freed; 2325 PV_STAT(pv_entry_frees += freed); 2326 PV_STAT(pv_entry_spare += freed); 2327 pv_entry_count -= freed; 2328 TAILQ_REMOVE(&pmap->pm_pvchunk, pc, pc_list); 2329 for (field = 0; field < _NPCM; field++) 2330 if (pc->pc_map[field] != pc_freemask[field]) { 2331 TAILQ_INSERT_HEAD(&pmap->pm_pvchunk, pc, 2332 pc_list); 2333 TAILQ_INSERT_TAIL(&newtail, pc, pc_lru); 2334 2335 /* 2336 * One freed pv entry in locked_pmap is 2337 * sufficient. 2338 */ 2339 if (pmap == locked_pmap) 2340 goto out; 2341 break; 2342 } 2343 if (field == _NPCM) { 2344 PV_STAT(pv_entry_spare -= _NPCPV); 2345 PV_STAT(pc_chunk_count--); 2346 PV_STAT(pc_chunk_frees++); 2347 /* Entire chunk is free; return it. */ 2348 m_pc = PHYS_TO_VM_PAGE(pmap_kextract((vm_offset_t)pc)); 2349 pmap_qremove((vm_offset_t)pc, 1); 2350 pmap_ptelist_free(&pv_vafree, (vm_offset_t)pc); 2351 break; 2352 } 2353 } 2354out: 2355 TAILQ_CONCAT(&pv_chunks, &newtail, pc_lru); 2356 if (pmap != NULL) { 2357 pmap_invalidate_all(pmap); 2358 if (pmap != locked_pmap) 2359 PMAP_UNLOCK(pmap); 2360 } 2361 if (m_pc == NULL && pv_vafree != 0 && free != NULL) { 2362 m_pc = free; 2363 free = m_pc->right; 2364 /* Recycle a freed page table page. */ 2365 m_pc->wire_count = 1; 2366 atomic_add_int(&cnt.v_wire_count, 1); 2367 } 2368 pmap_free_zero_pages(free); 2369 return (m_pc); 2370} 2371 2372/* 2373 * free the pv_entry back to the free list 2374 */ 2375static void 2376free_pv_entry(pmap_t pmap, pv_entry_t pv) 2377{ 2378 struct pv_chunk *pc; 2379 int idx, field, bit; 2380 2381 rw_assert(&pvh_global_lock, RA_WLOCKED); 2382 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 2383 PV_STAT(pv_entry_frees++); 2384 PV_STAT(pv_entry_spare++); 2385 pv_entry_count--; 2386 pc = pv_to_chunk(pv); 2387 idx = pv - &pc->pc_pventry[0]; 2388 field = idx / 32; 2389 bit = idx % 32; 2390 pc->pc_map[field] |= 1ul << bit; 2391 for (idx = 0; idx < _NPCM; idx++) 2392 if (pc->pc_map[idx] != pc_freemask[idx]) { 2393 /* 2394 * 98% of the time, pc is already at the head of the 2395 * list. If it isn't already, move it to the head. 2396 */ 2397 if (__predict_false(TAILQ_FIRST(&pmap->pm_pvchunk) != 2398 pc)) { 2399 TAILQ_REMOVE(&pmap->pm_pvchunk, pc, pc_list); 2400 TAILQ_INSERT_HEAD(&pmap->pm_pvchunk, pc, 2401 pc_list); 2402 } 2403 return; 2404 } 2405 TAILQ_REMOVE(&pmap->pm_pvchunk, pc, pc_list); 2406 free_pv_chunk(pc); 2407} 2408 2409static void 2410free_pv_chunk(struct pv_chunk *pc) 2411{ 2412 vm_page_t m; 2413 2414 TAILQ_REMOVE(&pv_chunks, pc, pc_lru); 2415 PV_STAT(pv_entry_spare -= _NPCPV); 2416 PV_STAT(pc_chunk_count--); 2417 PV_STAT(pc_chunk_frees++); 2418 /* entire chunk is free, return it */ 2419 m = PHYS_TO_VM_PAGE(pmap_kextract((vm_offset_t)pc)); 2420 pmap_qremove((vm_offset_t)pc, 1); 2421 vm_page_unwire(m, 0); 2422 vm_page_free(m); 2423 pmap_ptelist_free(&pv_vafree, (vm_offset_t)pc); 2424} 2425 2426/* 2427 * get a new pv_entry, allocating a block from the system 2428 * when needed. 2429 */ 2430static pv_entry_t 2431get_pv_entry(pmap_t pmap, boolean_t try) 2432{ 2433 static const struct timeval printinterval = { 60, 0 }; 2434 static struct timeval lastprint; 2435 int bit, field; 2436 pv_entry_t pv; 2437 struct pv_chunk *pc; 2438 vm_page_t m; 2439 2440 rw_assert(&pvh_global_lock, RA_WLOCKED); 2441 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 2442 PV_STAT(pv_entry_allocs++); 2443 pv_entry_count++; 2444 if (pv_entry_count > pv_entry_high_water) 2445 if (ratecheck(&lastprint, &printinterval)) 2446 printf("Approaching the limit on PV entries, consider " 2447 "increasing either the vm.pmap.shpgperproc or the " 2448 "vm.pmap.pv_entry_max tunable.\n"); 2449retry: 2450 pc = TAILQ_FIRST(&pmap->pm_pvchunk); 2451 if (pc != NULL) { 2452 for (field = 0; field < _NPCM; field++) { 2453 if (pc->pc_map[field]) { 2454 bit = bsfl(pc->pc_map[field]); 2455 break; 2456 } 2457 } 2458 if (field < _NPCM) { 2459 pv = &pc->pc_pventry[field * 32 + bit]; 2460 pc->pc_map[field] &= ~(1ul << bit); 2461 /* If this was the last item, move it to tail */ 2462 for (field = 0; field < _NPCM; field++) 2463 if (pc->pc_map[field] != 0) { 2464 PV_STAT(pv_entry_spare--); 2465 return (pv); /* not full, return */ 2466 } 2467 TAILQ_REMOVE(&pmap->pm_pvchunk, pc, pc_list); 2468 TAILQ_INSERT_TAIL(&pmap->pm_pvchunk, pc, pc_list); 2469 PV_STAT(pv_entry_spare--); 2470 return (pv); 2471 } 2472 } 2473 /* 2474 * Access to the ptelist "pv_vafree" is synchronized by the pvh 2475 * global lock. If "pv_vafree" is currently non-empty, it will 2476 * remain non-empty until pmap_ptelist_alloc() completes. 2477 */ 2478 if (pv_vafree == 0 || (m = vm_page_alloc(NULL, 0, VM_ALLOC_NORMAL | 2479 VM_ALLOC_NOOBJ | VM_ALLOC_WIRED)) == NULL) { 2480 if (try) { 2481 pv_entry_count--; 2482 PV_STAT(pc_chunk_tryfail++); 2483 return (NULL); 2484 } 2485 m = pmap_pv_reclaim(pmap); 2486 if (m == NULL) 2487 goto retry; 2488 } 2489 PV_STAT(pc_chunk_count++); 2490 PV_STAT(pc_chunk_allocs++); 2491 pc = (struct pv_chunk *)pmap_ptelist_alloc(&pv_vafree); 2492 pmap_qenter((vm_offset_t)pc, &m, 1); 2493 pc->pc_pmap = pmap; 2494 pc->pc_map[0] = pc_freemask[0] & ~1ul; /* preallocated bit 0 */ 2495 for (field = 1; field < _NPCM; field++) 2496 pc->pc_map[field] = pc_freemask[field]; 2497 TAILQ_INSERT_TAIL(&pv_chunks, pc, pc_lru); 2498 pv = &pc->pc_pventry[0]; 2499 TAILQ_INSERT_HEAD(&pmap->pm_pvchunk, pc, pc_list); 2500 PV_STAT(pv_entry_spare += _NPCPV - 1); 2501 return (pv); 2502} 2503 2504static __inline pv_entry_t 2505pmap_pvh_remove(struct md_page *pvh, pmap_t pmap, vm_offset_t va) 2506{ 2507 pv_entry_t pv; 2508 2509 rw_assert(&pvh_global_lock, RA_WLOCKED); 2510 TAILQ_FOREACH(pv, &pvh->pv_list, pv_list) { 2511 if (pmap == PV_PMAP(pv) && va == pv->pv_va) { 2512 TAILQ_REMOVE(&pvh->pv_list, pv, pv_list); 2513 break; 2514 } 2515 } 2516 return (pv); 2517} 2518 2519static void 2520pmap_pv_demote_pde(pmap_t pmap, vm_offset_t va, vm_paddr_t pa) 2521{ 2522 struct md_page *pvh; 2523 pv_entry_t pv; 2524 vm_offset_t va_last; 2525 vm_page_t m; 2526 2527 rw_assert(&pvh_global_lock, RA_WLOCKED); 2528 KASSERT((pa & PDRMASK) == 0, 2529 ("pmap_pv_demote_pde: pa is not 4mpage aligned")); 2530 2531 /* 2532 * Transfer the 4mpage's pv entry for this mapping to the first 2533 * page's pv list. 2534 */ 2535 pvh = pa_to_pvh(pa); 2536 va = trunc_4mpage(va); 2537 pv = pmap_pvh_remove(pvh, pmap, va); 2538 KASSERT(pv != NULL, ("pmap_pv_demote_pde: pv not found")); 2539 m = PHYS_TO_VM_PAGE(pa); 2540 TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list); 2541 /* Instantiate the remaining NPTEPG - 1 pv entries. */ 2542 va_last = va + NBPDR - PAGE_SIZE; 2543 do { 2544 m++; 2545 KASSERT((m->oflags & VPO_UNMANAGED) == 0, 2546 ("pmap_pv_demote_pde: page %p is not managed", m)); 2547 va += PAGE_SIZE; 2548 pmap_insert_entry(pmap, va, m); 2549 } while (va < va_last); 2550} 2551 2552static void 2553pmap_pv_promote_pde(pmap_t pmap, vm_offset_t va, vm_paddr_t pa) 2554{ 2555 struct md_page *pvh; 2556 pv_entry_t pv; 2557 vm_offset_t va_last; 2558 vm_page_t m; 2559 2560 rw_assert(&pvh_global_lock, RA_WLOCKED); 2561 KASSERT((pa & PDRMASK) == 0, 2562 ("pmap_pv_promote_pde: pa is not 4mpage aligned")); 2563 2564 /* 2565 * Transfer the first page's pv entry for this mapping to the 2566 * 4mpage's pv list. Aside from avoiding the cost of a call 2567 * to get_pv_entry(), a transfer avoids the possibility that 2568 * get_pv_entry() calls pmap_collect() and that pmap_collect() 2569 * removes one of the mappings that is being promoted. 2570 */ 2571 m = PHYS_TO_VM_PAGE(pa); 2572 va = trunc_4mpage(va); 2573 pv = pmap_pvh_remove(&m->md, pmap, va); 2574 KASSERT(pv != NULL, ("pmap_pv_promote_pde: pv not found")); 2575 pvh = pa_to_pvh(pa); 2576 TAILQ_INSERT_TAIL(&pvh->pv_list, pv, pv_list); 2577 /* Free the remaining NPTEPG - 1 pv entries. */ 2578 va_last = va + NBPDR - PAGE_SIZE; 2579 do { 2580 m++; 2581 va += PAGE_SIZE; 2582 pmap_pvh_free(&m->md, pmap, va); 2583 } while (va < va_last); 2584} 2585 2586static void 2587pmap_pvh_free(struct md_page *pvh, pmap_t pmap, vm_offset_t va) 2588{ 2589 pv_entry_t pv; 2590 2591 pv = pmap_pvh_remove(pvh, pmap, va); 2592 KASSERT(pv != NULL, ("pmap_pvh_free: pv not found")); 2593 free_pv_entry(pmap, pv); 2594} 2595 2596static void 2597pmap_remove_entry(pmap_t pmap, vm_page_t m, vm_offset_t va) 2598{ 2599 struct md_page *pvh; 2600 2601 rw_assert(&pvh_global_lock, RA_WLOCKED); 2602 pmap_pvh_free(&m->md, pmap, va); 2603 if (TAILQ_EMPTY(&m->md.pv_list) && (m->flags & PG_FICTITIOUS) == 0) { 2604 pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m)); 2605 if (TAILQ_EMPTY(&pvh->pv_list)) 2606 vm_page_aflag_clear(m, PGA_WRITEABLE); 2607 } 2608} 2609 2610/* 2611 * Create a pv entry for page at pa for 2612 * (pmap, va). 2613 */ 2614static void 2615pmap_insert_entry(pmap_t pmap, vm_offset_t va, vm_page_t m) 2616{ 2617 pv_entry_t pv; 2618 2619 rw_assert(&pvh_global_lock, RA_WLOCKED); 2620 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 2621 pv = get_pv_entry(pmap, FALSE); 2622 pv->pv_va = va; 2623 TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list); 2624} 2625 2626/* 2627 * Conditionally create a pv entry. 2628 */ 2629static boolean_t 2630pmap_try_insert_pv_entry(pmap_t pmap, vm_offset_t va, vm_page_t m) 2631{ 2632 pv_entry_t pv; 2633 2634 rw_assert(&pvh_global_lock, RA_WLOCKED); 2635 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 2636 if (pv_entry_count < pv_entry_high_water && 2637 (pv = get_pv_entry(pmap, TRUE)) != NULL) { 2638 pv->pv_va = va; 2639 TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list); 2640 return (TRUE); 2641 } else 2642 return (FALSE); 2643} 2644 2645/* 2646 * Create the pv entries for each of the pages within a superpage. 2647 */ 2648static boolean_t 2649pmap_pv_insert_pde(pmap_t pmap, vm_offset_t va, vm_paddr_t pa) 2650{ 2651 struct md_page *pvh; 2652 pv_entry_t pv; 2653 2654 rw_assert(&pvh_global_lock, RA_WLOCKED); 2655 if (pv_entry_count < pv_entry_high_water && 2656 (pv = get_pv_entry(pmap, TRUE)) != NULL) { 2657 pv->pv_va = va; 2658 pvh = pa_to_pvh(pa); 2659 TAILQ_INSERT_TAIL(&pvh->pv_list, pv, pv_list); 2660 return (TRUE); 2661 } else 2662 return (FALSE); 2663} 2664 2665/* 2666 * Fills a page table page with mappings to consecutive physical pages. 2667 */ 2668static void 2669pmap_fill_ptp(pt_entry_t *firstpte, pt_entry_t newpte) 2670{ 2671 pt_entry_t *pte; 2672 2673 for (pte = firstpte; pte < firstpte + NPTEPG; pte++) { 2674 *pte = newpte; 2675 newpte += PAGE_SIZE; 2676 } 2677} 2678 2679/* 2680 * Tries to demote a 2- or 4MB page mapping. If demotion fails, the 2681 * 2- or 4MB page mapping is invalidated. 2682 */ 2683static boolean_t 2684pmap_demote_pde(pmap_t pmap, pd_entry_t *pde, vm_offset_t va) 2685{ 2686 pd_entry_t newpde, oldpde; 2687 pt_entry_t *firstpte, newpte; 2688 vm_paddr_t mptepa; 2689 vm_page_t free, mpte; 2690 2691 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 2692 oldpde = *pde; 2693 KASSERT((oldpde & (PG_PS | PG_V)) == (PG_PS | PG_V), 2694 ("pmap_demote_pde: oldpde is missing PG_PS and/or PG_V")); 2695 mpte = pmap_lookup_pt_page(pmap, va); 2696 if (mpte != NULL) 2697 pmap_remove_pt_page(pmap, mpte); 2698 else { 2699 KASSERT((oldpde & PG_W) == 0, 2700 ("pmap_demote_pde: page table page for a wired mapping" 2701 " is missing")); 2702 2703 /* 2704 * Invalidate the 2- or 4MB page mapping and return 2705 * "failure" if the mapping was never accessed or the 2706 * allocation of the new page table page fails. 2707 */ 2708 if ((oldpde & PG_A) == 0 || (mpte = vm_page_alloc(NULL, 2709 va >> PDRSHIFT, VM_ALLOC_NOOBJ | VM_ALLOC_NORMAL | 2710 VM_ALLOC_WIRED)) == NULL) { 2711 free = NULL; 2712 pmap_remove_pde(pmap, pde, trunc_4mpage(va), &free); 2713 pmap_invalidate_page(pmap, trunc_4mpage(va)); 2714 pmap_free_zero_pages(free); 2715 CTR2(KTR_PMAP, "pmap_demote_pde: failure for va %#x" 2716 " in pmap %p", va, pmap); 2717 return (FALSE); 2718 } 2719 if (va < VM_MAXUSER_ADDRESS) 2720 pmap->pm_stats.resident_count++; 2721 } 2722 mptepa = VM_PAGE_TO_PHYS(mpte); 2723 2724 /* 2725 * If the page mapping is in the kernel's address space, then the 2726 * KPTmap can provide access to the page table page. Otherwise, 2727 * temporarily map the page table page (mpte) into the kernel's 2728 * address space at either PADDR1 or PADDR2. 2729 */ 2730 if (va >= KERNBASE) 2731 firstpte = &KPTmap[i386_btop(trunc_4mpage(va))]; 2732 else if (curthread->td_pinned > 0 && rw_wowned(&pvh_global_lock)) { 2733 if ((*PMAP1 & PG_FRAME) != mptepa) { 2734 *PMAP1 = mptepa | PG_RW | PG_V | PG_A | PG_M; 2735#ifdef SMP 2736 PMAP1cpu = PCPU_GET(cpuid); 2737#endif 2738 invlcaddr(PADDR1); 2739 PMAP1changed++; 2740 } else 2741#ifdef SMP 2742 if (PMAP1cpu != PCPU_GET(cpuid)) { 2743 PMAP1cpu = PCPU_GET(cpuid); 2744 invlcaddr(PADDR1); 2745 PMAP1changedcpu++; 2746 } else 2747#endif 2748 PMAP1unchanged++; 2749 firstpte = PADDR1; 2750 } else { 2751 mtx_lock(&PMAP2mutex); 2752 if ((*PMAP2 & PG_FRAME) != mptepa) { 2753 *PMAP2 = mptepa | PG_RW | PG_V | PG_A | PG_M; 2754 pmap_invalidate_page(kernel_pmap, (vm_offset_t)PADDR2); 2755 } 2756 firstpte = PADDR2; 2757 } 2758 newpde = mptepa | PG_M | PG_A | (oldpde & PG_U) | PG_RW | PG_V; 2759 KASSERT((oldpde & PG_A) != 0, 2760 ("pmap_demote_pde: oldpde is missing PG_A")); 2761 KASSERT((oldpde & (PG_M | PG_RW)) != PG_RW, 2762 ("pmap_demote_pde: oldpde is missing PG_M")); 2763 newpte = oldpde & ~PG_PS; 2764 if ((newpte & PG_PDE_PAT) != 0) 2765 newpte ^= PG_PDE_PAT | PG_PTE_PAT; 2766 2767 /* 2768 * If the page table page is new, initialize it. 2769 */ 2770 if (mpte->wire_count == 1) { 2771 mpte->wire_count = NPTEPG; 2772 pmap_fill_ptp(firstpte, newpte); 2773 } 2774 KASSERT((*firstpte & PG_FRAME) == (newpte & PG_FRAME), 2775 ("pmap_demote_pde: firstpte and newpte map different physical" 2776 " addresses")); 2777 2778 /* 2779 * If the mapping has changed attributes, update the page table 2780 * entries. 2781 */ 2782 if ((*firstpte & PG_PTE_PROMOTE) != (newpte & PG_PTE_PROMOTE)) 2783 pmap_fill_ptp(firstpte, newpte); 2784 2785 /* 2786 * Demote the mapping. This pmap is locked. The old PDE has 2787 * PG_A set. If the old PDE has PG_RW set, it also has PG_M 2788 * set. Thus, there is no danger of a race with another 2789 * processor changing the setting of PG_A and/or PG_M between 2790 * the read above and the store below. 2791 */ 2792 if (workaround_erratum383) 2793 pmap_update_pde(pmap, va, pde, newpde); 2794 else if (pmap == kernel_pmap) 2795 pmap_kenter_pde(va, newpde); 2796 else 2797 pde_store(pde, newpde); 2798 if (firstpte == PADDR2) 2799 mtx_unlock(&PMAP2mutex); 2800 2801 /* 2802 * Invalidate the recursive mapping of the page table page. 2803 */ 2804 pmap_invalidate_page(pmap, (vm_offset_t)vtopte(va)); 2805 2806 /* 2807 * Demote the pv entry. This depends on the earlier demotion 2808 * of the mapping. Specifically, the (re)creation of a per- 2809 * page pv entry might trigger the execution of pmap_collect(), 2810 * which might reclaim a newly (re)created per-page pv entry 2811 * and destroy the associated mapping. In order to destroy 2812 * the mapping, the PDE must have already changed from mapping 2813 * the 2mpage to referencing the page table page. 2814 */ 2815 if ((oldpde & PG_MANAGED) != 0) 2816 pmap_pv_demote_pde(pmap, va, oldpde & PG_PS_FRAME); 2817 2818 pmap_pde_demotions++; 2819 CTR2(KTR_PMAP, "pmap_demote_pde: success for va %#x" 2820 " in pmap %p", va, pmap); 2821 return (TRUE); 2822} 2823 2824/* 2825 * pmap_remove_pde: do the things to unmap a superpage in a process 2826 */ 2827static void 2828pmap_remove_pde(pmap_t pmap, pd_entry_t *pdq, vm_offset_t sva, 2829 vm_page_t *free) 2830{ 2831 struct md_page *pvh; 2832 pd_entry_t oldpde; 2833 vm_offset_t eva, va; 2834 vm_page_t m, mpte; 2835 2836 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 2837 KASSERT((sva & PDRMASK) == 0, 2838 ("pmap_remove_pde: sva is not 4mpage aligned")); 2839 oldpde = pte_load_clear(pdq); 2840 if (oldpde & PG_W) 2841 pmap->pm_stats.wired_count -= NBPDR / PAGE_SIZE; 2842 2843 /* 2844 * Machines that don't support invlpg, also don't support 2845 * PG_G. 2846 */ 2847 if (oldpde & PG_G) 2848 pmap_invalidate_page(kernel_pmap, sva); 2849 pmap->pm_stats.resident_count -= NBPDR / PAGE_SIZE; 2850 if (oldpde & PG_MANAGED) { 2851 pvh = pa_to_pvh(oldpde & PG_PS_FRAME); 2852 pmap_pvh_free(pvh, pmap, sva); 2853 eva = sva + NBPDR; 2854 for (va = sva, m = PHYS_TO_VM_PAGE(oldpde & PG_PS_FRAME); 2855 va < eva; va += PAGE_SIZE, m++) { 2856 if ((oldpde & (PG_M | PG_RW)) == (PG_M | PG_RW)) 2857 vm_page_dirty(m); 2858 if (oldpde & PG_A) 2859 vm_page_aflag_set(m, PGA_REFERENCED); 2860 if (TAILQ_EMPTY(&m->md.pv_list) && 2861 TAILQ_EMPTY(&pvh->pv_list)) 2862 vm_page_aflag_clear(m, PGA_WRITEABLE); 2863 } 2864 } 2865 if (pmap == kernel_pmap) { 2866 if (!pmap_demote_pde(pmap, pdq, sva)) 2867 panic("pmap_remove_pde: failed demotion"); 2868 } else { 2869 mpte = pmap_lookup_pt_page(pmap, sva); 2870 if (mpte != NULL) { 2871 pmap_remove_pt_page(pmap, mpte); 2872 pmap->pm_stats.resident_count--; 2873 KASSERT(mpte->wire_count == NPTEPG, 2874 ("pmap_remove_pde: pte page wire count error")); 2875 mpte->wire_count = 0; 2876 pmap_add_delayed_free_list(mpte, free, FALSE); 2877 atomic_subtract_int(&cnt.v_wire_count, 1); 2878 } 2879 } 2880} 2881 2882/* 2883 * pmap_remove_pte: do the things to unmap a page in a process 2884 */ 2885static int 2886pmap_remove_pte(pmap_t pmap, pt_entry_t *ptq, vm_offset_t va, vm_page_t *free) 2887{ 2888 pt_entry_t oldpte; 2889 vm_page_t m; 2890 2891 rw_assert(&pvh_global_lock, RA_WLOCKED); 2892 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 2893 oldpte = pte_load_clear(ptq); 2894 KASSERT(oldpte != 0, 2895 ("pmap_remove_pte: pmap %p va %x zero pte", pmap, va)); 2896 if (oldpte & PG_W) 2897 pmap->pm_stats.wired_count -= 1; 2898 /* 2899 * Machines that don't support invlpg, also don't support 2900 * PG_G. 2901 */ 2902 if (oldpte & PG_G) 2903 pmap_invalidate_page(kernel_pmap, va); 2904 pmap->pm_stats.resident_count -= 1; 2905 if (oldpte & PG_MANAGED) { 2906 m = PHYS_TO_VM_PAGE(oldpte & PG_FRAME); 2907 if ((oldpte & (PG_M | PG_RW)) == (PG_M | PG_RW)) 2908 vm_page_dirty(m); 2909 if (oldpte & PG_A) 2910 vm_page_aflag_set(m, PGA_REFERENCED); 2911 pmap_remove_entry(pmap, m, va); 2912 } 2913 return (pmap_unuse_pt(pmap, va, free)); 2914} 2915 2916/* 2917 * Remove a single page from a process address space 2918 */ 2919static void 2920pmap_remove_page(pmap_t pmap, vm_offset_t va, vm_page_t *free) 2921{ 2922 pt_entry_t *pte; 2923 2924 rw_assert(&pvh_global_lock, RA_WLOCKED); 2925 KASSERT(curthread->td_pinned > 0, ("curthread not pinned")); 2926 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 2927 if ((pte = pmap_pte_quick(pmap, va)) == NULL || *pte == 0) 2928 return; 2929 pmap_remove_pte(pmap, pte, va, free); 2930 pmap_invalidate_page(pmap, va); 2931} 2932 2933/* 2934 * Remove the given range of addresses from the specified map. 2935 * 2936 * It is assumed that the start and end are properly 2937 * rounded to the page size. 2938 */ 2939void 2940pmap_remove(pmap_t pmap, vm_offset_t sva, vm_offset_t eva) 2941{ 2942 vm_offset_t pdnxt; 2943 pd_entry_t ptpaddr; 2944 pt_entry_t *pte; 2945 vm_page_t free = NULL; 2946 int anyvalid; 2947 2948 /* 2949 * Perform an unsynchronized read. This is, however, safe. 2950 */ 2951 if (pmap->pm_stats.resident_count == 0) 2952 return; 2953 2954 anyvalid = 0; 2955 2956 rw_wlock(&pvh_global_lock); 2957 sched_pin(); 2958 PMAP_LOCK(pmap); 2959 2960 /* 2961 * special handling of removing one page. a very 2962 * common operation and easy to short circuit some 2963 * code. 2964 */ 2965 if ((sva + PAGE_SIZE == eva) && 2966 ((pmap->pm_pdir[(sva >> PDRSHIFT)] & PG_PS) == 0)) { 2967 pmap_remove_page(pmap, sva, &free); 2968 goto out; 2969 } 2970 2971 for (; sva < eva; sva = pdnxt) { 2972 u_int pdirindex; 2973 2974 /* 2975 * Calculate index for next page table. 2976 */ 2977 pdnxt = (sva + NBPDR) & ~PDRMASK; 2978 if (pdnxt < sva) 2979 pdnxt = eva; 2980 if (pmap->pm_stats.resident_count == 0) 2981 break; 2982 2983 pdirindex = sva >> PDRSHIFT; 2984 ptpaddr = pmap->pm_pdir[pdirindex]; 2985 2986 /* 2987 * Weed out invalid mappings. Note: we assume that the page 2988 * directory table is always allocated, and in kernel virtual. 2989 */ 2990 if (ptpaddr == 0) 2991 continue; 2992 2993 /* 2994 * Check for large page. 2995 */ 2996 if ((ptpaddr & PG_PS) != 0) { 2997 /* 2998 * Are we removing the entire large page? If not, 2999 * demote the mapping and fall through. 3000 */ 3001 if (sva + NBPDR == pdnxt && eva >= pdnxt) { 3002 /* 3003 * The TLB entry for a PG_G mapping is 3004 * invalidated by pmap_remove_pde(). 3005 */ 3006 if ((ptpaddr & PG_G) == 0) 3007 anyvalid = 1; 3008 pmap_remove_pde(pmap, 3009 &pmap->pm_pdir[pdirindex], sva, &free); 3010 continue; 3011 } else if (!pmap_demote_pde(pmap, 3012 &pmap->pm_pdir[pdirindex], sva)) { 3013 /* The large page mapping was destroyed. */ 3014 continue; 3015 } 3016 } 3017 3018 /* 3019 * Limit our scan to either the end of the va represented 3020 * by the current page table page, or to the end of the 3021 * range being removed. 3022 */ 3023 if (pdnxt > eva) 3024 pdnxt = eva; 3025 3026 for (pte = pmap_pte_quick(pmap, sva); sva != pdnxt; pte++, 3027 sva += PAGE_SIZE) { 3028 if (*pte == 0) 3029 continue; 3030 3031 /* 3032 * The TLB entry for a PG_G mapping is invalidated 3033 * by pmap_remove_pte(). 3034 */ 3035 if ((*pte & PG_G) == 0) 3036 anyvalid = 1; 3037 if (pmap_remove_pte(pmap, pte, sva, &free)) 3038 break; 3039 } 3040 } 3041out: 3042 sched_unpin(); 3043 if (anyvalid) 3044 pmap_invalidate_all(pmap); 3045 rw_wunlock(&pvh_global_lock); 3046 PMAP_UNLOCK(pmap); 3047 pmap_free_zero_pages(free); 3048} 3049 3050/* 3051 * Routine: pmap_remove_all 3052 * Function: 3053 * Removes this physical page from 3054 * all physical maps in which it resides. 3055 * Reflects back modify bits to the pager. 3056 * 3057 * Notes: 3058 * Original versions of this routine were very 3059 * inefficient because they iteratively called 3060 * pmap_remove (slow...) 3061 */ 3062 3063void 3064pmap_remove_all(vm_page_t m) 3065{ 3066 struct md_page *pvh; 3067 pv_entry_t pv; 3068 pmap_t pmap; 3069 pt_entry_t *pte, tpte; 3070 pd_entry_t *pde; 3071 vm_offset_t va; 3072 vm_page_t free; 3073 3074 KASSERT((m->oflags & VPO_UNMANAGED) == 0, 3075 ("pmap_remove_all: page %p is not managed", m)); 3076 free = NULL; 3077 rw_wlock(&pvh_global_lock); 3078 sched_pin(); 3079 if ((m->flags & PG_FICTITIOUS) != 0) 3080 goto small_mappings; 3081 pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m)); 3082 while ((pv = TAILQ_FIRST(&pvh->pv_list)) != NULL) { 3083 va = pv->pv_va; 3084 pmap = PV_PMAP(pv); 3085 PMAP_LOCK(pmap); 3086 pde = pmap_pde(pmap, va); 3087 (void)pmap_demote_pde(pmap, pde, va); 3088 PMAP_UNLOCK(pmap); 3089 } 3090small_mappings: 3091 while ((pv = TAILQ_FIRST(&m->md.pv_list)) != NULL) { 3092 pmap = PV_PMAP(pv); 3093 PMAP_LOCK(pmap); 3094 pmap->pm_stats.resident_count--; 3095 pde = pmap_pde(pmap, pv->pv_va); 3096 KASSERT((*pde & PG_PS) == 0, ("pmap_remove_all: found" 3097 " a 4mpage in page %p's pv list", m)); 3098 pte = pmap_pte_quick(pmap, pv->pv_va); 3099 tpte = pte_load_clear(pte); 3100 KASSERT(tpte != 0, ("pmap_remove_all: pmap %p va %x zero pte", 3101 pmap, pv->pv_va)); 3102 if (tpte & PG_W) 3103 pmap->pm_stats.wired_count--; 3104 if (tpte & PG_A) 3105 vm_page_aflag_set(m, PGA_REFERENCED); 3106 3107 /* 3108 * Update the vm_page_t clean and reference bits. 3109 */ 3110 if ((tpte & (PG_M | PG_RW)) == (PG_M | PG_RW)) 3111 vm_page_dirty(m); 3112 pmap_unuse_pt(pmap, pv->pv_va, &free); 3113 pmap_invalidate_page(pmap, pv->pv_va); 3114 TAILQ_REMOVE(&m->md.pv_list, pv, pv_list); 3115 free_pv_entry(pmap, pv); 3116 PMAP_UNLOCK(pmap); 3117 } 3118 vm_page_aflag_clear(m, PGA_WRITEABLE); 3119 sched_unpin(); 3120 rw_wunlock(&pvh_global_lock); 3121 pmap_free_zero_pages(free); 3122} 3123 3124/* 3125 * pmap_protect_pde: do the things to protect a 4mpage in a process 3126 */ 3127static boolean_t 3128pmap_protect_pde(pmap_t pmap, pd_entry_t *pde, vm_offset_t sva, vm_prot_t prot) 3129{ 3130 pd_entry_t newpde, oldpde; 3131 vm_offset_t eva, va; 3132 vm_page_t m; 3133 boolean_t anychanged; 3134 3135 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 3136 KASSERT((sva & PDRMASK) == 0, 3137 ("pmap_protect_pde: sva is not 4mpage aligned")); 3138 anychanged = FALSE; 3139retry: 3140 oldpde = newpde = *pde; 3141 if (oldpde & PG_MANAGED) { 3142 eva = sva + NBPDR; 3143 for (va = sva, m = PHYS_TO_VM_PAGE(oldpde & PG_PS_FRAME); 3144 va < eva; va += PAGE_SIZE, m++) 3145 if ((oldpde & (PG_M | PG_RW)) == (PG_M | PG_RW)) 3146 vm_page_dirty(m); 3147 } 3148 if ((prot & VM_PROT_WRITE) == 0) 3149 newpde &= ~(PG_RW | PG_M); 3150#ifdef PAE 3151 if ((prot & VM_PROT_EXECUTE) == 0) 3152 newpde |= pg_nx; 3153#endif 3154 if (newpde != oldpde) { 3155 if (!pde_cmpset(pde, oldpde, newpde)) 3156 goto retry; 3157 if (oldpde & PG_G) 3158 pmap_invalidate_page(pmap, sva); 3159 else 3160 anychanged = TRUE; 3161 } 3162 return (anychanged); 3163} 3164 3165/* 3166 * Set the physical protection on the 3167 * specified range of this map as requested. 3168 */ 3169void 3170pmap_protect(pmap_t pmap, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot) 3171{ 3172 vm_offset_t pdnxt; 3173 pd_entry_t ptpaddr; 3174 pt_entry_t *pte; 3175 boolean_t anychanged, pv_lists_locked; 3176 3177 if ((prot & VM_PROT_READ) == VM_PROT_NONE) { 3178 pmap_remove(pmap, sva, eva); 3179 return; 3180 } 3181 3182#ifdef PAE 3183 if ((prot & (VM_PROT_WRITE|VM_PROT_EXECUTE)) == 3184 (VM_PROT_WRITE|VM_PROT_EXECUTE)) 3185 return; 3186#else 3187 if (prot & VM_PROT_WRITE) 3188 return; 3189#endif 3190 3191 if (pmap_is_current(pmap)) 3192 pv_lists_locked = FALSE; 3193 else { 3194 pv_lists_locked = TRUE; 3195resume: 3196 rw_wlock(&pvh_global_lock); 3197 sched_pin(); 3198 } 3199 anychanged = FALSE; 3200 3201 PMAP_LOCK(pmap); 3202 for (; sva < eva; sva = pdnxt) { 3203 pt_entry_t obits, pbits; 3204 u_int pdirindex; 3205 3206 pdnxt = (sva + NBPDR) & ~PDRMASK; 3207 if (pdnxt < sva) 3208 pdnxt = eva; 3209 3210 pdirindex = sva >> PDRSHIFT; 3211 ptpaddr = pmap->pm_pdir[pdirindex]; 3212 3213 /* 3214 * Weed out invalid mappings. Note: we assume that the page 3215 * directory table is always allocated, and in kernel virtual. 3216 */ 3217 if (ptpaddr == 0) 3218 continue; 3219 3220 /* 3221 * Check for large page. 3222 */ 3223 if ((ptpaddr & PG_PS) != 0) { 3224 /* 3225 * Are we protecting the entire large page? If not, 3226 * demote the mapping and fall through. 3227 */ 3228 if (sva + NBPDR == pdnxt && eva >= pdnxt) { 3229 /* 3230 * The TLB entry for a PG_G mapping is 3231 * invalidated by pmap_protect_pde(). 3232 */ 3233 if (pmap_protect_pde(pmap, 3234 &pmap->pm_pdir[pdirindex], sva, prot)) 3235 anychanged = TRUE; 3236 continue; 3237 } else { 3238 if (!pv_lists_locked) { 3239 pv_lists_locked = TRUE; 3240 if (!rw_try_wlock(&pvh_global_lock)) { 3241 if (anychanged) 3242 pmap_invalidate_all( 3243 pmap); 3244 PMAP_UNLOCK(pmap); 3245 goto resume; 3246 } 3247 sched_pin(); 3248 } 3249 if (!pmap_demote_pde(pmap, 3250 &pmap->pm_pdir[pdirindex], sva)) { 3251 /* 3252 * The large page mapping was 3253 * destroyed. 3254 */ 3255 continue; 3256 } 3257 } 3258 } 3259 3260 if (pdnxt > eva) 3261 pdnxt = eva; 3262 3263 for (pte = pmap_pte_quick(pmap, sva); sva != pdnxt; pte++, 3264 sva += PAGE_SIZE) { 3265 vm_page_t m; 3266 3267retry: 3268 /* 3269 * Regardless of whether a pte is 32 or 64 bits in 3270 * size, PG_RW, PG_A, and PG_M are among the least 3271 * significant 32 bits. 3272 */ 3273 obits = pbits = *pte; 3274 if ((pbits & PG_V) == 0) 3275 continue; 3276 3277 if ((prot & VM_PROT_WRITE) == 0) { 3278 if ((pbits & (PG_MANAGED | PG_M | PG_RW)) == 3279 (PG_MANAGED | PG_M | PG_RW)) { 3280 m = PHYS_TO_VM_PAGE(pbits & PG_FRAME); 3281 vm_page_dirty(m); 3282 } 3283 pbits &= ~(PG_RW | PG_M); 3284 } 3285#ifdef PAE 3286 if ((prot & VM_PROT_EXECUTE) == 0) 3287 pbits |= pg_nx; 3288#endif 3289 3290 if (pbits != obits) { 3291#ifdef PAE 3292 if (!atomic_cmpset_64(pte, obits, pbits)) 3293 goto retry; 3294#else 3295 if (!atomic_cmpset_int((u_int *)pte, obits, 3296 pbits)) 3297 goto retry; 3298#endif 3299 if (obits & PG_G) 3300 pmap_invalidate_page(pmap, sva); 3301 else 3302 anychanged = TRUE; 3303 } 3304 } 3305 } 3306 if (anychanged) 3307 pmap_invalidate_all(pmap); 3308 if (pv_lists_locked) { 3309 sched_unpin(); 3310 rw_wunlock(&pvh_global_lock); 3311 } 3312 PMAP_UNLOCK(pmap); 3313} 3314 3315/* 3316 * Tries to promote the 512 or 1024, contiguous 4KB page mappings that are 3317 * within a single page table page (PTP) to a single 2- or 4MB page mapping. 3318 * For promotion to occur, two conditions must be met: (1) the 4KB page 3319 * mappings must map aligned, contiguous physical memory and (2) the 4KB page 3320 * mappings must have identical characteristics. 3321 * 3322 * Managed (PG_MANAGED) mappings within the kernel address space are not 3323 * promoted. The reason is that kernel PDEs are replicated in each pmap but 3324 * pmap_clear_ptes() and pmap_ts_referenced() only read the PDE from the kernel 3325 * pmap. 3326 */ 3327static void 3328pmap_promote_pde(pmap_t pmap, pd_entry_t *pde, vm_offset_t va) 3329{ 3330 pd_entry_t newpde; 3331 pt_entry_t *firstpte, oldpte, pa, *pte; 3332 vm_offset_t oldpteva; 3333 vm_page_t mpte; 3334 3335 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 3336 3337 /* 3338 * Examine the first PTE in the specified PTP. Abort if this PTE is 3339 * either invalid, unused, or does not map the first 4KB physical page 3340 * within a 2- or 4MB page. 3341 */ 3342 firstpte = pmap_pte_quick(pmap, trunc_4mpage(va)); 3343setpde: 3344 newpde = *firstpte; 3345 if ((newpde & ((PG_FRAME & PDRMASK) | PG_A | PG_V)) != (PG_A | PG_V)) { 3346 pmap_pde_p_failures++; 3347 CTR2(KTR_PMAP, "pmap_promote_pde: failure for va %#x" 3348 " in pmap %p", va, pmap); 3349 return; 3350 } 3351 if ((*firstpte & PG_MANAGED) != 0 && pmap == kernel_pmap) { 3352 pmap_pde_p_failures++; 3353 CTR2(KTR_PMAP, "pmap_promote_pde: failure for va %#x" 3354 " in pmap %p", va, pmap); 3355 return; 3356 } 3357 if ((newpde & (PG_M | PG_RW)) == PG_RW) { 3358 /* 3359 * When PG_M is already clear, PG_RW can be cleared without 3360 * a TLB invalidation. 3361 */ 3362 if (!atomic_cmpset_int((u_int *)firstpte, newpde, newpde & 3363 ~PG_RW)) 3364 goto setpde; 3365 newpde &= ~PG_RW; 3366 } 3367 3368 /* 3369 * Examine each of the other PTEs in the specified PTP. Abort if this 3370 * PTE maps an unexpected 4KB physical page or does not have identical 3371 * characteristics to the first PTE. 3372 */ 3373 pa = (newpde & (PG_PS_FRAME | PG_A | PG_V)) + NBPDR - PAGE_SIZE; 3374 for (pte = firstpte + NPTEPG - 1; pte > firstpte; pte--) { 3375setpte: 3376 oldpte = *pte; 3377 if ((oldpte & (PG_FRAME | PG_A | PG_V)) != pa) { 3378 pmap_pde_p_failures++; 3379 CTR2(KTR_PMAP, "pmap_promote_pde: failure for va %#x" 3380 " in pmap %p", va, pmap); 3381 return; 3382 } 3383 if ((oldpte & (PG_M | PG_RW)) == PG_RW) { 3384 /* 3385 * When PG_M is already clear, PG_RW can be cleared 3386 * without a TLB invalidation. 3387 */ 3388 if (!atomic_cmpset_int((u_int *)pte, oldpte, 3389 oldpte & ~PG_RW)) 3390 goto setpte; 3391 oldpte &= ~PG_RW; 3392 oldpteva = (oldpte & PG_FRAME & PDRMASK) | 3393 (va & ~PDRMASK); 3394 CTR2(KTR_PMAP, "pmap_promote_pde: protect for va %#x" 3395 " in pmap %p", oldpteva, pmap); 3396 } 3397 if ((oldpte & PG_PTE_PROMOTE) != (newpde & PG_PTE_PROMOTE)) { 3398 pmap_pde_p_failures++; 3399 CTR2(KTR_PMAP, "pmap_promote_pde: failure for va %#x" 3400 " in pmap %p", va, pmap); 3401 return; 3402 } 3403 pa -= PAGE_SIZE; 3404 } 3405 3406 /* 3407 * Save the page table page in its current state until the PDE 3408 * mapping the superpage is demoted by pmap_demote_pde() or 3409 * destroyed by pmap_remove_pde(). 3410 */ 3411 mpte = PHYS_TO_VM_PAGE(*pde & PG_FRAME); 3412 KASSERT(mpte >= vm_page_array && 3413 mpte < &vm_page_array[vm_page_array_size], 3414 ("pmap_promote_pde: page table page is out of range")); 3415 KASSERT(mpte->pindex == va >> PDRSHIFT, 3416 ("pmap_promote_pde: page table page's pindex is wrong")); 3417 pmap_insert_pt_page(pmap, mpte); 3418 3419 /* 3420 * Promote the pv entries. 3421 */ 3422 if ((newpde & PG_MANAGED) != 0) 3423 pmap_pv_promote_pde(pmap, va, newpde & PG_PS_FRAME); 3424 3425 /* 3426 * Propagate the PAT index to its proper position. 3427 */ 3428 if ((newpde & PG_PTE_PAT) != 0) 3429 newpde ^= PG_PDE_PAT | PG_PTE_PAT; 3430 3431 /* 3432 * Map the superpage. 3433 */ 3434 if (workaround_erratum383) 3435 pmap_update_pde(pmap, va, pde, PG_PS | newpde); 3436 else if (pmap == kernel_pmap) 3437 pmap_kenter_pde(va, PG_PS | newpde); 3438 else 3439 pde_store(pde, PG_PS | newpde); 3440 3441 pmap_pde_promotions++; 3442 CTR2(KTR_PMAP, "pmap_promote_pde: success for va %#x" 3443 " in pmap %p", va, pmap); 3444} 3445 3446/* 3447 * Insert the given physical page (p) at 3448 * the specified virtual address (v) in the 3449 * target physical map with the protection requested. 3450 * 3451 * If specified, the page will be wired down, meaning 3452 * that the related pte can not be reclaimed. 3453 * 3454 * NB: This is the only routine which MAY NOT lazy-evaluate 3455 * or lose information. That is, this routine must actually 3456 * insert this page into the given map NOW. 3457 */ 3458void 3459pmap_enter(pmap_t pmap, vm_offset_t va, vm_prot_t access, vm_page_t m, 3460 vm_prot_t prot, boolean_t wired) 3461{ 3462 pd_entry_t *pde; 3463 pt_entry_t *pte; 3464 pt_entry_t newpte, origpte; 3465 pv_entry_t pv; 3466 vm_paddr_t opa, pa; 3467 vm_page_t mpte, om; 3468 boolean_t invlva; 3469 3470 va = trunc_page(va); 3471 KASSERT(va <= VM_MAX_KERNEL_ADDRESS, ("pmap_enter: toobig")); 3472 KASSERT(va < UPT_MIN_ADDRESS || va >= UPT_MAX_ADDRESS, 3473 ("pmap_enter: invalid to pmap_enter page table pages (va: 0x%x)", 3474 va)); 3475 KASSERT((m->oflags & (VPO_UNMANAGED | VPO_BUSY)) != 0 || 3476 VM_OBJECT_LOCKED(m->object), 3477 ("pmap_enter: page %p is not busy", m)); 3478 3479 mpte = NULL; 3480 3481 rw_wlock(&pvh_global_lock); 3482 PMAP_LOCK(pmap); 3483 sched_pin(); 3484 3485 /* 3486 * In the case that a page table page is not 3487 * resident, we are creating it here. 3488 */ 3489 if (va < VM_MAXUSER_ADDRESS) { 3490 mpte = pmap_allocpte(pmap, va, M_WAITOK); 3491 } 3492 3493 pde = pmap_pde(pmap, va); 3494 if ((*pde & PG_PS) != 0) 3495 panic("pmap_enter: attempted pmap_enter on 4MB page"); 3496 pte = pmap_pte_quick(pmap, va); 3497 3498 /* 3499 * Page Directory table entry not valid, we need a new PT page 3500 */ 3501 if (pte == NULL) { 3502 panic("pmap_enter: invalid page directory pdir=%#jx, va=%#x", 3503 (uintmax_t)pmap->pm_pdir[PTDPTDI], va); 3504 } 3505 3506 pa = VM_PAGE_TO_PHYS(m); 3507 om = NULL; 3508 origpte = *pte; 3509 opa = origpte & PG_FRAME; 3510 3511 /* 3512 * Mapping has not changed, must be protection or wiring change. 3513 */ 3514 if (origpte && (opa == pa)) { 3515 /* 3516 * Wiring change, just update stats. We don't worry about 3517 * wiring PT pages as they remain resident as long as there 3518 * are valid mappings in them. Hence, if a user page is wired, 3519 * the PT page will be also. 3520 */ 3521 if (wired && ((origpte & PG_W) == 0)) 3522 pmap->pm_stats.wired_count++; 3523 else if (!wired && (origpte & PG_W)) 3524 pmap->pm_stats.wired_count--; 3525 3526 /* 3527 * Remove extra pte reference 3528 */ 3529 if (mpte) 3530 mpte->wire_count--; 3531 3532 if (origpte & PG_MANAGED) { 3533 om = m; 3534 pa |= PG_MANAGED; 3535 } 3536 goto validate; 3537 } 3538 3539 pv = NULL; 3540 3541 /* 3542 * Mapping has changed, invalidate old range and fall through to 3543 * handle validating new mapping. 3544 */ 3545 if (opa) { 3546 if (origpte & PG_W) 3547 pmap->pm_stats.wired_count--; 3548 if (origpte & PG_MANAGED) { 3549 om = PHYS_TO_VM_PAGE(opa); 3550 pv = pmap_pvh_remove(&om->md, pmap, va); 3551 } 3552 if (mpte != NULL) { 3553 mpte->wire_count--; 3554 KASSERT(mpte->wire_count > 0, 3555 ("pmap_enter: missing reference to page table page," 3556 " va: 0x%x", va)); 3557 } 3558 } else 3559 pmap->pm_stats.resident_count++; 3560 3561 /* 3562 * Enter on the PV list if part of our managed memory. 3563 */ 3564 if ((m->oflags & VPO_UNMANAGED) == 0) { 3565 KASSERT(va < kmi.clean_sva || va >= kmi.clean_eva, 3566 ("pmap_enter: managed mapping within the clean submap")); 3567 if (pv == NULL) 3568 pv = get_pv_entry(pmap, FALSE); 3569 pv->pv_va = va; 3570 TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list); 3571 pa |= PG_MANAGED; 3572 } else if (pv != NULL) 3573 free_pv_entry(pmap, pv); 3574 3575 /* 3576 * Increment counters 3577 */ 3578 if (wired) 3579 pmap->pm_stats.wired_count++; 3580 3581validate: 3582 /* 3583 * Now validate mapping with desired protection/wiring. 3584 */ 3585 newpte = (pt_entry_t)(pa | pmap_cache_bits(m->md.pat_mode, 0) | PG_V); 3586 if ((prot & VM_PROT_WRITE) != 0) { 3587 newpte |= PG_RW; 3588 if ((newpte & PG_MANAGED) != 0) 3589 vm_page_aflag_set(m, PGA_WRITEABLE); 3590 } 3591#ifdef PAE 3592 if ((prot & VM_PROT_EXECUTE) == 0) 3593 newpte |= pg_nx; 3594#endif 3595 if (wired) 3596 newpte |= PG_W; 3597 if (va < VM_MAXUSER_ADDRESS) 3598 newpte |= PG_U; 3599 if (pmap == kernel_pmap) 3600 newpte |= pgeflag; 3601 3602 /* 3603 * if the mapping or permission bits are different, we need 3604 * to update the pte. 3605 */ 3606 if ((origpte & ~(PG_M|PG_A)) != newpte) { 3607 newpte |= PG_A; 3608 if ((access & VM_PROT_WRITE) != 0) 3609 newpte |= PG_M; 3610 if (origpte & PG_V) { 3611 invlva = FALSE; 3612 origpte = pte_load_store(pte, newpte); 3613 if (origpte & PG_A) { 3614 if (origpte & PG_MANAGED) 3615 vm_page_aflag_set(om, PGA_REFERENCED); 3616 if (opa != VM_PAGE_TO_PHYS(m)) 3617 invlva = TRUE; 3618#ifdef PAE 3619 if ((origpte & PG_NX) == 0 && 3620 (newpte & PG_NX) != 0) 3621 invlva = TRUE; 3622#endif 3623 } 3624 if ((origpte & (PG_M | PG_RW)) == (PG_M | PG_RW)) { 3625 if ((origpte & PG_MANAGED) != 0) 3626 vm_page_dirty(om); 3627 if ((prot & VM_PROT_WRITE) == 0) 3628 invlva = TRUE; 3629 } 3630 if ((origpte & PG_MANAGED) != 0 && 3631 TAILQ_EMPTY(&om->md.pv_list) && 3632 ((om->flags & PG_FICTITIOUS) != 0 || 3633 TAILQ_EMPTY(&pa_to_pvh(opa)->pv_list))) 3634 vm_page_aflag_clear(om, PGA_WRITEABLE); 3635 if (invlva) 3636 pmap_invalidate_page(pmap, va); 3637 } else 3638 pte_store(pte, newpte); 3639 } 3640 3641 /* 3642 * If both the page table page and the reservation are fully 3643 * populated, then attempt promotion. 3644 */ 3645 if ((mpte == NULL || mpte->wire_count == NPTEPG) && 3646 pg_ps_enabled && (m->flags & PG_FICTITIOUS) == 0 && 3647 vm_reserv_level_iffullpop(m) == 0) 3648 pmap_promote_pde(pmap, pde, va); 3649 3650 sched_unpin(); 3651 rw_wunlock(&pvh_global_lock); 3652 PMAP_UNLOCK(pmap); 3653} 3654 3655/* 3656 * Tries to create a 2- or 4MB page mapping. Returns TRUE if successful and 3657 * FALSE otherwise. Fails if (1) a page table page cannot be allocated without 3658 * blocking, (2) a mapping already exists at the specified virtual address, or 3659 * (3) a pv entry cannot be allocated without reclaiming another pv entry. 3660 */ 3661static boolean_t 3662pmap_enter_pde(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot) 3663{ 3664 pd_entry_t *pde, newpde; 3665 3666 rw_assert(&pvh_global_lock, RA_WLOCKED); 3667 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 3668 pde = pmap_pde(pmap, va); 3669 if (*pde != 0) { 3670 CTR2(KTR_PMAP, "pmap_enter_pde: failure for va %#lx" 3671 " in pmap %p", va, pmap); 3672 return (FALSE); 3673 } 3674 newpde = VM_PAGE_TO_PHYS(m) | pmap_cache_bits(m->md.pat_mode, 1) | 3675 PG_PS | PG_V; 3676 if ((m->oflags & VPO_UNMANAGED) == 0) { 3677 newpde |= PG_MANAGED; 3678 3679 /* 3680 * Abort this mapping if its PV entry could not be created. 3681 */ 3682 if (!pmap_pv_insert_pde(pmap, va, VM_PAGE_TO_PHYS(m))) { 3683 CTR2(KTR_PMAP, "pmap_enter_pde: failure for va %#lx" 3684 " in pmap %p", va, pmap); 3685 return (FALSE); 3686 } 3687 } 3688#ifdef PAE 3689 if ((prot & VM_PROT_EXECUTE) == 0) 3690 newpde |= pg_nx; 3691#endif 3692 if (va < VM_MAXUSER_ADDRESS) 3693 newpde |= PG_U; 3694 3695 /* 3696 * Increment counters. 3697 */ 3698 pmap->pm_stats.resident_count += NBPDR / PAGE_SIZE; 3699 3700 /* 3701 * Map the superpage. 3702 */ 3703 pde_store(pde, newpde); 3704 3705 pmap_pde_mappings++; 3706 CTR2(KTR_PMAP, "pmap_enter_pde: success for va %#lx" 3707 " in pmap %p", va, pmap); 3708 return (TRUE); 3709} 3710 3711/* 3712 * Maps a sequence of resident pages belonging to the same object. 3713 * The sequence begins with the given page m_start. This page is 3714 * mapped at the given virtual address start. Each subsequent page is 3715 * mapped at a virtual address that is offset from start by the same 3716 * amount as the page is offset from m_start within the object. The 3717 * last page in the sequence is the page with the largest offset from 3718 * m_start that can be mapped at a virtual address less than the given 3719 * virtual address end. Not every virtual page between start and end 3720 * is mapped; only those for which a resident page exists with the 3721 * corresponding offset from m_start are mapped. 3722 */ 3723void 3724pmap_enter_object(pmap_t pmap, vm_offset_t start, vm_offset_t end, 3725 vm_page_t m_start, vm_prot_t prot) 3726{ 3727 vm_offset_t va; 3728 vm_page_t m, mpte; 3729 vm_pindex_t diff, psize; 3730 3731 VM_OBJECT_LOCK_ASSERT(m_start->object, MA_OWNED); 3732 psize = atop(end - start); 3733 mpte = NULL; 3734 m = m_start; 3735 rw_wlock(&pvh_global_lock); 3736 PMAP_LOCK(pmap); 3737 while (m != NULL && (diff = m->pindex - m_start->pindex) < psize) { 3738 va = start + ptoa(diff); 3739 if ((va & PDRMASK) == 0 && va + NBPDR <= end && 3740 (VM_PAGE_TO_PHYS(m) & PDRMASK) == 0 && 3741 pg_ps_enabled && vm_reserv_level_iffullpop(m) == 0 && 3742 pmap_enter_pde(pmap, va, m, prot)) 3743 m = &m[NBPDR / PAGE_SIZE - 1]; 3744 else 3745 mpte = pmap_enter_quick_locked(pmap, va, m, prot, 3746 mpte); 3747 m = TAILQ_NEXT(m, listq); 3748 } 3749 rw_wunlock(&pvh_global_lock); 3750 PMAP_UNLOCK(pmap); 3751} 3752 3753/* 3754 * this code makes some *MAJOR* assumptions: 3755 * 1. Current pmap & pmap exists. 3756 * 2. Not wired. 3757 * 3. Read access. 3758 * 4. No page table pages. 3759 * but is *MUCH* faster than pmap_enter... 3760 */ 3761 3762void 3763pmap_enter_quick(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot) 3764{ 3765 3766 rw_wlock(&pvh_global_lock); 3767 PMAP_LOCK(pmap); 3768 (void)pmap_enter_quick_locked(pmap, va, m, prot, NULL); 3769 rw_wunlock(&pvh_global_lock); 3770 PMAP_UNLOCK(pmap); 3771} 3772 3773static vm_page_t 3774pmap_enter_quick_locked(pmap_t pmap, vm_offset_t va, vm_page_t m, 3775 vm_prot_t prot, vm_page_t mpte) 3776{ 3777 pt_entry_t *pte; 3778 vm_paddr_t pa; 3779 vm_page_t free; 3780 3781 KASSERT(va < kmi.clean_sva || va >= kmi.clean_eva || 3782 (m->oflags & VPO_UNMANAGED) != 0, 3783 ("pmap_enter_quick_locked: managed mapping within the clean submap")); 3784 rw_assert(&pvh_global_lock, RA_WLOCKED); 3785 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 3786 3787 /* 3788 * In the case that a page table page is not 3789 * resident, we are creating it here. 3790 */ 3791 if (va < VM_MAXUSER_ADDRESS) { 3792 u_int ptepindex; 3793 pd_entry_t ptepa; 3794 3795 /* 3796 * Calculate pagetable page index 3797 */ 3798 ptepindex = va >> PDRSHIFT; 3799 if (mpte && (mpte->pindex == ptepindex)) { 3800 mpte->wire_count++; 3801 } else { 3802 /* 3803 * Get the page directory entry 3804 */ 3805 ptepa = pmap->pm_pdir[ptepindex]; 3806 3807 /* 3808 * If the page table page is mapped, we just increment 3809 * the hold count, and activate it. 3810 */ 3811 if (ptepa) { 3812 if (ptepa & PG_PS) 3813 return (NULL); 3814 mpte = PHYS_TO_VM_PAGE(ptepa & PG_FRAME); 3815 mpte->wire_count++; 3816 } else { 3817 mpte = _pmap_allocpte(pmap, ptepindex, 3818 M_NOWAIT); 3819 if (mpte == NULL) 3820 return (mpte); 3821 } 3822 } 3823 } else { 3824 mpte = NULL; 3825 } 3826 3827 /* 3828 * This call to vtopte makes the assumption that we are 3829 * entering the page into the current pmap. In order to support 3830 * quick entry into any pmap, one would likely use pmap_pte_quick. 3831 * But that isn't as quick as vtopte. 3832 */ 3833 pte = vtopte(va); 3834 if (*pte) { 3835 if (mpte != NULL) { 3836 mpte->wire_count--; 3837 mpte = NULL; 3838 } 3839 return (mpte); 3840 } 3841 3842 /* 3843 * Enter on the PV list if part of our managed memory. 3844 */ 3845 if ((m->oflags & VPO_UNMANAGED) == 0 && 3846 !pmap_try_insert_pv_entry(pmap, va, m)) { 3847 if (mpte != NULL) { 3848 free = NULL; 3849 if (pmap_unwire_ptp(pmap, mpte, &free)) { 3850 pmap_invalidate_page(pmap, va); 3851 pmap_free_zero_pages(free); 3852 } 3853 3854 mpte = NULL; 3855 } 3856 return (mpte); 3857 } 3858 3859 /* 3860 * Increment counters 3861 */ 3862 pmap->pm_stats.resident_count++; 3863 3864 pa = VM_PAGE_TO_PHYS(m) | pmap_cache_bits(m->md.pat_mode, 0); 3865#ifdef PAE 3866 if ((prot & VM_PROT_EXECUTE) == 0) 3867 pa |= pg_nx; 3868#endif 3869 3870 /* 3871 * Now validate mapping with RO protection 3872 */ 3873 if ((m->oflags & VPO_UNMANAGED) != 0) 3874 pte_store(pte, pa | PG_V | PG_U); 3875 else 3876 pte_store(pte, pa | PG_V | PG_U | PG_MANAGED); 3877 return (mpte); 3878} 3879 3880/* 3881 * Make a temporary mapping for a physical address. This is only intended 3882 * to be used for panic dumps. 3883 */ 3884void * 3885pmap_kenter_temporary(vm_paddr_t pa, int i) 3886{ 3887 vm_offset_t va; 3888 3889 va = (vm_offset_t)crashdumpmap + (i * PAGE_SIZE); 3890 pmap_kenter(va, pa); 3891 invlpg(va); 3892 return ((void *)crashdumpmap); 3893} 3894 3895/* 3896 * This code maps large physical mmap regions into the 3897 * processor address space. Note that some shortcuts 3898 * are taken, but the code works. 3899 */ 3900void 3901pmap_object_init_pt(pmap_t pmap, vm_offset_t addr, vm_object_t object, 3902 vm_pindex_t pindex, vm_size_t size) 3903{ 3904 pd_entry_t *pde; 3905 vm_paddr_t pa, ptepa; 3906 vm_page_t p; 3907 int pat_mode; 3908 3909 VM_OBJECT_LOCK_ASSERT(object, MA_OWNED); 3910 KASSERT(object->type == OBJT_DEVICE || object->type == OBJT_SG, 3911 ("pmap_object_init_pt: non-device object")); 3912 if (pseflag && 3913 (addr & (NBPDR - 1)) == 0 && (size & (NBPDR - 1)) == 0) { 3914 if (!vm_object_populate(object, pindex, pindex + atop(size))) 3915 return; 3916 p = vm_page_lookup(object, pindex); 3917 KASSERT(p->valid == VM_PAGE_BITS_ALL, 3918 ("pmap_object_init_pt: invalid page %p", p)); 3919 pat_mode = p->md.pat_mode; 3920 3921 /* 3922 * Abort the mapping if the first page is not physically 3923 * aligned to a 2/4MB page boundary. 3924 */ 3925 ptepa = VM_PAGE_TO_PHYS(p); 3926 if (ptepa & (NBPDR - 1)) 3927 return; 3928 3929 /* 3930 * Skip the first page. Abort the mapping if the rest of 3931 * the pages are not physically contiguous or have differing 3932 * memory attributes. 3933 */ 3934 p = TAILQ_NEXT(p, listq); 3935 for (pa = ptepa + PAGE_SIZE; pa < ptepa + size; 3936 pa += PAGE_SIZE) { 3937 KASSERT(p->valid == VM_PAGE_BITS_ALL, 3938 ("pmap_object_init_pt: invalid page %p", p)); 3939 if (pa != VM_PAGE_TO_PHYS(p) || 3940 pat_mode != p->md.pat_mode) 3941 return; 3942 p = TAILQ_NEXT(p, listq); 3943 } 3944 3945 /* 3946 * Map using 2/4MB pages. Since "ptepa" is 2/4M aligned and 3947 * "size" is a multiple of 2/4M, adding the PAT setting to 3948 * "pa" will not affect the termination of this loop. 3949 */ 3950 PMAP_LOCK(pmap); 3951 for (pa = ptepa | pmap_cache_bits(pat_mode, 1); pa < ptepa + 3952 size; pa += NBPDR) { 3953 pde = pmap_pde(pmap, addr); 3954 if (*pde == 0) { 3955 pde_store(pde, pa | PG_PS | PG_M | PG_A | 3956 PG_U | PG_RW | PG_V); 3957 pmap->pm_stats.resident_count += NBPDR / 3958 PAGE_SIZE; 3959 pmap_pde_mappings++; 3960 } 3961 /* Else continue on if the PDE is already valid. */ 3962 addr += NBPDR; 3963 } 3964 PMAP_UNLOCK(pmap); 3965 } 3966} 3967 3968/* 3969 * Routine: pmap_change_wiring 3970 * Function: Change the wiring attribute for a map/virtual-address 3971 * pair. 3972 * In/out conditions: 3973 * The mapping must already exist in the pmap. 3974 */ 3975void 3976pmap_change_wiring(pmap_t pmap, vm_offset_t va, boolean_t wired) 3977{ 3978 pd_entry_t *pde; 3979 pt_entry_t *pte; 3980 boolean_t are_queues_locked; 3981 3982 are_queues_locked = FALSE; 3983retry: 3984 PMAP_LOCK(pmap); 3985 pde = pmap_pde(pmap, va); 3986 if ((*pde & PG_PS) != 0) { 3987 if (!wired != ((*pde & PG_W) == 0)) { 3988 if (!are_queues_locked) { 3989 are_queues_locked = TRUE; 3990 if (!rw_try_wlock(&pvh_global_lock)) { 3991 PMAP_UNLOCK(pmap); 3992 rw_wlock(&pvh_global_lock); 3993 goto retry; 3994 } 3995 } 3996 if (!pmap_demote_pde(pmap, pde, va)) 3997 panic("pmap_change_wiring: demotion failed"); 3998 } else 3999 goto out; 4000 } 4001 pte = pmap_pte(pmap, va); 4002 4003 if (wired && !pmap_pte_w(pte)) 4004 pmap->pm_stats.wired_count++; 4005 else if (!wired && pmap_pte_w(pte)) 4006 pmap->pm_stats.wired_count--; 4007 4008 /* 4009 * Wiring is not a hardware characteristic so there is no need to 4010 * invalidate TLB. 4011 */ 4012 pmap_pte_set_w(pte, wired); 4013 pmap_pte_release(pte); 4014out: 4015 if (are_queues_locked) 4016 rw_wunlock(&pvh_global_lock); 4017 PMAP_UNLOCK(pmap); 4018} 4019 4020 4021 4022/* 4023 * Copy the range specified by src_addr/len 4024 * from the source map to the range dst_addr/len 4025 * in the destination map. 4026 * 4027 * This routine is only advisory and need not do anything. 4028 */ 4029 4030void 4031pmap_copy(pmap_t dst_pmap, pmap_t src_pmap, vm_offset_t dst_addr, vm_size_t len, 4032 vm_offset_t src_addr) 4033{ 4034 vm_page_t free; 4035 vm_offset_t addr; 4036 vm_offset_t end_addr = src_addr + len; 4037 vm_offset_t pdnxt; 4038 4039 if (dst_addr != src_addr) 4040 return; 4041 4042 if (!pmap_is_current(src_pmap)) 4043 return; 4044 4045 rw_wlock(&pvh_global_lock); 4046 if (dst_pmap < src_pmap) { 4047 PMAP_LOCK(dst_pmap); 4048 PMAP_LOCK(src_pmap); 4049 } else { 4050 PMAP_LOCK(src_pmap); 4051 PMAP_LOCK(dst_pmap); 4052 } 4053 sched_pin(); 4054 for (addr = src_addr; addr < end_addr; addr = pdnxt) { 4055 pt_entry_t *src_pte, *dst_pte; 4056 vm_page_t dstmpte, srcmpte; 4057 pd_entry_t srcptepaddr; 4058 u_int ptepindex; 4059 4060 KASSERT(addr < UPT_MIN_ADDRESS, 4061 ("pmap_copy: invalid to pmap_copy page tables")); 4062 4063 pdnxt = (addr + NBPDR) & ~PDRMASK; 4064 if (pdnxt < addr) 4065 pdnxt = end_addr; 4066 ptepindex = addr >> PDRSHIFT; 4067 4068 srcptepaddr = src_pmap->pm_pdir[ptepindex]; 4069 if (srcptepaddr == 0) 4070 continue; 4071 4072 if (srcptepaddr & PG_PS) { 4073 if (dst_pmap->pm_pdir[ptepindex] == 0 && 4074 ((srcptepaddr & PG_MANAGED) == 0 || 4075 pmap_pv_insert_pde(dst_pmap, addr, srcptepaddr & 4076 PG_PS_FRAME))) { 4077 dst_pmap->pm_pdir[ptepindex] = srcptepaddr & 4078 ~PG_W; 4079 dst_pmap->pm_stats.resident_count += 4080 NBPDR / PAGE_SIZE; 4081 } 4082 continue; 4083 } 4084 4085 srcmpte = PHYS_TO_VM_PAGE(srcptepaddr & PG_FRAME); 4086 KASSERT(srcmpte->wire_count > 0, 4087 ("pmap_copy: source page table page is unused")); 4088 4089 if (pdnxt > end_addr) 4090 pdnxt = end_addr; 4091 4092 src_pte = vtopte(addr); 4093 while (addr < pdnxt) { 4094 pt_entry_t ptetemp; 4095 ptetemp = *src_pte; 4096 /* 4097 * we only virtual copy managed pages 4098 */ 4099 if ((ptetemp & PG_MANAGED) != 0) { 4100 dstmpte = pmap_allocpte(dst_pmap, addr, 4101 M_NOWAIT); 4102 if (dstmpte == NULL) 4103 goto out; 4104 dst_pte = pmap_pte_quick(dst_pmap, addr); 4105 if (*dst_pte == 0 && 4106 pmap_try_insert_pv_entry(dst_pmap, addr, 4107 PHYS_TO_VM_PAGE(ptetemp & PG_FRAME))) { 4108 /* 4109 * Clear the wired, modified, and 4110 * accessed (referenced) bits 4111 * during the copy. 4112 */ 4113 *dst_pte = ptetemp & ~(PG_W | PG_M | 4114 PG_A); 4115 dst_pmap->pm_stats.resident_count++; 4116 } else { 4117 free = NULL; 4118 if (pmap_unwire_ptp(dst_pmap, dstmpte, 4119 &free)) { 4120 pmap_invalidate_page(dst_pmap, 4121 addr); 4122 pmap_free_zero_pages(free); 4123 } 4124 goto out; 4125 } 4126 if (dstmpte->wire_count >= srcmpte->wire_count) 4127 break; 4128 } 4129 addr += PAGE_SIZE; 4130 src_pte++; 4131 } 4132 } 4133out: 4134 sched_unpin(); 4135 rw_wunlock(&pvh_global_lock); 4136 PMAP_UNLOCK(src_pmap); 4137 PMAP_UNLOCK(dst_pmap); 4138} 4139 4140static __inline void 4141pagezero(void *page) 4142{ 4143#if defined(I686_CPU) 4144 if (cpu_class == CPUCLASS_686) { 4145#if defined(CPU_ENABLE_SSE) 4146 if (cpu_feature & CPUID_SSE2) 4147 sse2_pagezero(page); 4148 else 4149#endif 4150 i686_pagezero(page); 4151 } else 4152#endif 4153 bzero(page, PAGE_SIZE); 4154} 4155 4156/* 4157 * pmap_zero_page zeros the specified hardware page by mapping 4158 * the page into KVM and using bzero to clear its contents. 4159 */ 4160void 4161pmap_zero_page(vm_page_t m) 4162{ 4163 struct sysmaps *sysmaps; 4164 4165 sysmaps = &sysmaps_pcpu[PCPU_GET(cpuid)]; 4166 mtx_lock(&sysmaps->lock); 4167 if (*sysmaps->CMAP2) 4168 panic("pmap_zero_page: CMAP2 busy"); 4169 sched_pin(); 4170 *sysmaps->CMAP2 = PG_V | PG_RW | VM_PAGE_TO_PHYS(m) | PG_A | PG_M | 4171 pmap_cache_bits(m->md.pat_mode, 0); 4172 invlcaddr(sysmaps->CADDR2); 4173 pagezero(sysmaps->CADDR2); 4174 *sysmaps->CMAP2 = 0; 4175 sched_unpin(); 4176 mtx_unlock(&sysmaps->lock); 4177} 4178 4179/* 4180 * pmap_zero_page_area zeros the specified hardware page by mapping 4181 * the page into KVM and using bzero to clear its contents. 4182 * 4183 * off and size may not cover an area beyond a single hardware page. 4184 */ 4185void 4186pmap_zero_page_area(vm_page_t m, int off, int size) 4187{ 4188 struct sysmaps *sysmaps; 4189 4190 sysmaps = &sysmaps_pcpu[PCPU_GET(cpuid)]; 4191 mtx_lock(&sysmaps->lock); 4192 if (*sysmaps->CMAP2) 4193 panic("pmap_zero_page_area: CMAP2 busy"); 4194 sched_pin(); 4195 *sysmaps->CMAP2 = PG_V | PG_RW | VM_PAGE_TO_PHYS(m) | PG_A | PG_M | 4196 pmap_cache_bits(m->md.pat_mode, 0); 4197 invlcaddr(sysmaps->CADDR2); 4198 if (off == 0 && size == PAGE_SIZE) 4199 pagezero(sysmaps->CADDR2); 4200 else 4201 bzero((char *)sysmaps->CADDR2 + off, size); 4202 *sysmaps->CMAP2 = 0; 4203 sched_unpin(); 4204 mtx_unlock(&sysmaps->lock); 4205} 4206 4207/* 4208 * pmap_zero_page_idle zeros the specified hardware page by mapping 4209 * the page into KVM and using bzero to clear its contents. This 4210 * is intended to be called from the vm_pagezero process only and 4211 * outside of Giant. 4212 */ 4213void 4214pmap_zero_page_idle(vm_page_t m) 4215{ 4216 4217 if (*CMAP3) 4218 panic("pmap_zero_page_idle: CMAP3 busy"); 4219 sched_pin(); 4220 *CMAP3 = PG_V | PG_RW | VM_PAGE_TO_PHYS(m) | PG_A | PG_M | 4221 pmap_cache_bits(m->md.pat_mode, 0); 4222 invlcaddr(CADDR3); 4223 pagezero(CADDR3); 4224 *CMAP3 = 0; 4225 sched_unpin(); 4226} 4227 4228/* 4229 * pmap_copy_page copies the specified (machine independent) 4230 * page by mapping the page into virtual memory and using 4231 * bcopy to copy the page, one machine dependent page at a 4232 * time. 4233 */ 4234void 4235pmap_copy_page(vm_page_t src, vm_page_t dst) 4236{ 4237 struct sysmaps *sysmaps; 4238 4239 sysmaps = &sysmaps_pcpu[PCPU_GET(cpuid)]; 4240 mtx_lock(&sysmaps->lock); 4241 if (*sysmaps->CMAP1) 4242 panic("pmap_copy_page: CMAP1 busy"); 4243 if (*sysmaps->CMAP2) 4244 panic("pmap_copy_page: CMAP2 busy"); 4245 sched_pin(); 4246 invlpg((u_int)sysmaps->CADDR1); 4247 invlpg((u_int)sysmaps->CADDR2); 4248 *sysmaps->CMAP1 = PG_V | VM_PAGE_TO_PHYS(src) | PG_A | 4249 pmap_cache_bits(src->md.pat_mode, 0); 4250 *sysmaps->CMAP2 = PG_V | PG_RW | VM_PAGE_TO_PHYS(dst) | PG_A | PG_M | 4251 pmap_cache_bits(dst->md.pat_mode, 0); 4252 bcopy(sysmaps->CADDR1, sysmaps->CADDR2, PAGE_SIZE); 4253 *sysmaps->CMAP1 = 0; 4254 *sysmaps->CMAP2 = 0; 4255 sched_unpin(); 4256 mtx_unlock(&sysmaps->lock); 4257} 4258 4259int unmapped_buf_allowed = 1; 4260 4261void 4262pmap_copy_pages(vm_page_t ma[], vm_offset_t a_offset, vm_page_t mb[], 4263 vm_offset_t b_offset, int xfersize) 4264{ 4265 struct sysmaps *sysmaps; 4266 vm_page_t a_pg, b_pg; 4267 char *a_cp, *b_cp; 4268 vm_offset_t a_pg_offset, b_pg_offset; 4269 int cnt; 4270 4271 sysmaps = &sysmaps_pcpu[PCPU_GET(cpuid)]; 4272 mtx_lock(&sysmaps->lock); 4273 if (*sysmaps->CMAP1 != 0) 4274 panic("pmap_copy_pages: CMAP1 busy"); 4275 if (*sysmaps->CMAP2 != 0) 4276 panic("pmap_copy_pages: CMAP2 busy"); 4277 sched_pin(); 4278 while (xfersize > 0) { 4279 invlpg((u_int)sysmaps->CADDR1); 4280 invlpg((u_int)sysmaps->CADDR2); 4281 a_pg = ma[a_offset >> PAGE_SHIFT]; 4282 a_pg_offset = a_offset & PAGE_MASK; 4283 cnt = min(xfersize, PAGE_SIZE - a_pg_offset); 4284 b_pg = mb[b_offset >> PAGE_SHIFT]; 4285 b_pg_offset = b_offset & PAGE_MASK; 4286 cnt = min(cnt, PAGE_SIZE - b_pg_offset); 4287 *sysmaps->CMAP1 = PG_V | VM_PAGE_TO_PHYS(a_pg) | PG_A | 4288 pmap_cache_bits(b_pg->md.pat_mode, 0); 4289 *sysmaps->CMAP2 = PG_V | PG_RW | VM_PAGE_TO_PHYS(b_pg) | PG_A | 4290 PG_M | pmap_cache_bits(b_pg->md.pat_mode, 0); 4291 a_cp = sysmaps->CADDR1 + a_pg_offset; 4292 b_cp = sysmaps->CADDR2 + b_pg_offset; 4293 bcopy(a_cp, b_cp, cnt); 4294 a_offset += cnt; 4295 b_offset += cnt; 4296 xfersize -= cnt; 4297 } 4298 *sysmaps->CMAP1 = 0; 4299 *sysmaps->CMAP2 = 0; 4300 sched_unpin(); 4301 mtx_unlock(&sysmaps->lock); 4302} 4303 4304/* 4305 * Returns true if the pmap's pv is one of the first 4306 * 16 pvs linked to from this page. This count may 4307 * be changed upwards or downwards in the future; it 4308 * is only necessary that true be returned for a small 4309 * subset of pmaps for proper page aging. 4310 */ 4311boolean_t 4312pmap_page_exists_quick(pmap_t pmap, vm_page_t m) 4313{ 4314 struct md_page *pvh; 4315 pv_entry_t pv; 4316 int loops = 0; 4317 boolean_t rv; 4318 4319 KASSERT((m->oflags & VPO_UNMANAGED) == 0, 4320 ("pmap_page_exists_quick: page %p is not managed", m)); 4321 rv = FALSE; 4322 rw_wlock(&pvh_global_lock); 4323 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 4324 if (PV_PMAP(pv) == pmap) { 4325 rv = TRUE; 4326 break; 4327 } 4328 loops++; 4329 if (loops >= 16) 4330 break; 4331 } 4332 if (!rv && loops < 16 && (m->flags & PG_FICTITIOUS) == 0) { 4333 pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m)); 4334 TAILQ_FOREACH(pv, &pvh->pv_list, pv_list) { 4335 if (PV_PMAP(pv) == pmap) { 4336 rv = TRUE; 4337 break; 4338 } 4339 loops++; 4340 if (loops >= 16) 4341 break; 4342 } 4343 } 4344 rw_wunlock(&pvh_global_lock); 4345 return (rv); 4346} 4347 4348/* 4349 * pmap_page_wired_mappings: 4350 * 4351 * Return the number of managed mappings to the given physical page 4352 * that are wired. 4353 */ 4354int 4355pmap_page_wired_mappings(vm_page_t m) 4356{ 4357 int count; 4358 4359 count = 0; 4360 if ((m->oflags & VPO_UNMANAGED) != 0) 4361 return (count); 4362 rw_wlock(&pvh_global_lock); 4363 count = pmap_pvh_wired_mappings(&m->md, count); 4364 if ((m->flags & PG_FICTITIOUS) == 0) { 4365 count = pmap_pvh_wired_mappings(pa_to_pvh(VM_PAGE_TO_PHYS(m)), 4366 count); 4367 } 4368 rw_wunlock(&pvh_global_lock); 4369 return (count); 4370} 4371 4372/* 4373 * pmap_pvh_wired_mappings: 4374 * 4375 * Return the updated number "count" of managed mappings that are wired. 4376 */ 4377static int 4378pmap_pvh_wired_mappings(struct md_page *pvh, int count) 4379{ 4380 pmap_t pmap; 4381 pt_entry_t *pte; 4382 pv_entry_t pv; 4383 4384 rw_assert(&pvh_global_lock, RA_WLOCKED); 4385 sched_pin(); 4386 TAILQ_FOREACH(pv, &pvh->pv_list, pv_list) { 4387 pmap = PV_PMAP(pv); 4388 PMAP_LOCK(pmap); 4389 pte = pmap_pte_quick(pmap, pv->pv_va); 4390 if ((*pte & PG_W) != 0) 4391 count++; 4392 PMAP_UNLOCK(pmap); 4393 } 4394 sched_unpin(); 4395 return (count); 4396} 4397 4398/* 4399 * Returns TRUE if the given page is mapped individually or as part of 4400 * a 4mpage. Otherwise, returns FALSE. 4401 */ 4402boolean_t 4403pmap_page_is_mapped(vm_page_t m) 4404{ 4405 boolean_t rv; 4406 4407 if ((m->oflags & VPO_UNMANAGED) != 0) 4408 return (FALSE); 4409 rw_wlock(&pvh_global_lock); 4410 rv = !TAILQ_EMPTY(&m->md.pv_list) || 4411 ((m->flags & PG_FICTITIOUS) == 0 && 4412 !TAILQ_EMPTY(&pa_to_pvh(VM_PAGE_TO_PHYS(m))->pv_list)); 4413 rw_wunlock(&pvh_global_lock); 4414 return (rv); 4415} 4416 4417/* 4418 * Remove all pages from specified address space 4419 * this aids process exit speeds. Also, this code 4420 * is special cased for current process only, but 4421 * can have the more generic (and slightly slower) 4422 * mode enabled. This is much faster than pmap_remove 4423 * in the case of running down an entire address space. 4424 */ 4425void 4426pmap_remove_pages(pmap_t pmap) 4427{ 4428 pt_entry_t *pte, tpte; 4429 vm_page_t free = NULL; 4430 vm_page_t m, mpte, mt; 4431 pv_entry_t pv; 4432 struct md_page *pvh; 4433 struct pv_chunk *pc, *npc; 4434 int field, idx; 4435 int32_t bit; 4436 uint32_t inuse, bitmask; 4437 int allfree; 4438 4439 if (pmap != PCPU_GET(curpmap)) { 4440 printf("warning: pmap_remove_pages called with non-current pmap\n"); 4441 return; 4442 } 4443 rw_wlock(&pvh_global_lock); 4444 PMAP_LOCK(pmap); 4445 sched_pin(); 4446 TAILQ_FOREACH_SAFE(pc, &pmap->pm_pvchunk, pc_list, npc) { 4447 KASSERT(pc->pc_pmap == pmap, ("Wrong pmap %p %p", pmap, 4448 pc->pc_pmap)); 4449 allfree = 1; 4450 for (field = 0; field < _NPCM; field++) { 4451 inuse = ~pc->pc_map[field] & pc_freemask[field]; 4452 while (inuse != 0) { 4453 bit = bsfl(inuse); 4454 bitmask = 1UL << bit; 4455 idx = field * 32 + bit; 4456 pv = &pc->pc_pventry[idx]; 4457 inuse &= ~bitmask; 4458 4459 pte = pmap_pde(pmap, pv->pv_va); 4460 tpte = *pte; 4461 if ((tpte & PG_PS) == 0) { 4462 pte = vtopte(pv->pv_va); 4463 tpte = *pte & ~PG_PTE_PAT; 4464 } 4465 4466 if (tpte == 0) { 4467 printf( 4468 "TPTE at %p IS ZERO @ VA %08x\n", 4469 pte, pv->pv_va); 4470 panic("bad pte"); 4471 } 4472 4473/* 4474 * We cannot remove wired pages from a process' mapping at this time 4475 */ 4476 if (tpte & PG_W) { 4477 allfree = 0; 4478 continue; 4479 } 4480 4481 m = PHYS_TO_VM_PAGE(tpte & PG_FRAME); 4482 KASSERT(m->phys_addr == (tpte & PG_FRAME), 4483 ("vm_page_t %p phys_addr mismatch %016jx %016jx", 4484 m, (uintmax_t)m->phys_addr, 4485 (uintmax_t)tpte)); 4486 4487 KASSERT((m->flags & PG_FICTITIOUS) != 0 || 4488 m < &vm_page_array[vm_page_array_size], 4489 ("pmap_remove_pages: bad tpte %#jx", 4490 (uintmax_t)tpte)); 4491 4492 pte_clear(pte); 4493 4494 /* 4495 * Update the vm_page_t clean/reference bits. 4496 */ 4497 if ((tpte & (PG_M | PG_RW)) == (PG_M | PG_RW)) { 4498 if ((tpte & PG_PS) != 0) { 4499 for (mt = m; mt < &m[NBPDR / PAGE_SIZE]; mt++) 4500 vm_page_dirty(mt); 4501 } else 4502 vm_page_dirty(m); 4503 } 4504 4505 /* Mark free */ 4506 PV_STAT(pv_entry_frees++); 4507 PV_STAT(pv_entry_spare++); 4508 pv_entry_count--; 4509 pc->pc_map[field] |= bitmask; 4510 if ((tpte & PG_PS) != 0) { 4511 pmap->pm_stats.resident_count -= NBPDR / PAGE_SIZE; 4512 pvh = pa_to_pvh(tpte & PG_PS_FRAME); 4513 TAILQ_REMOVE(&pvh->pv_list, pv, pv_list); 4514 if (TAILQ_EMPTY(&pvh->pv_list)) { 4515 for (mt = m; mt < &m[NBPDR / PAGE_SIZE]; mt++) 4516 if (TAILQ_EMPTY(&mt->md.pv_list)) 4517 vm_page_aflag_clear(mt, PGA_WRITEABLE); 4518 } 4519 mpte = pmap_lookup_pt_page(pmap, pv->pv_va); 4520 if (mpte != NULL) { 4521 pmap_remove_pt_page(pmap, mpte); 4522 pmap->pm_stats.resident_count--; 4523 KASSERT(mpte->wire_count == NPTEPG, 4524 ("pmap_remove_pages: pte page wire count error")); 4525 mpte->wire_count = 0; 4526 pmap_add_delayed_free_list(mpte, &free, FALSE); 4527 atomic_subtract_int(&cnt.v_wire_count, 1); 4528 } 4529 } else { 4530 pmap->pm_stats.resident_count--; 4531 TAILQ_REMOVE(&m->md.pv_list, pv, pv_list); 4532 if (TAILQ_EMPTY(&m->md.pv_list) && 4533 (m->flags & PG_FICTITIOUS) == 0) { 4534 pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m)); 4535 if (TAILQ_EMPTY(&pvh->pv_list)) 4536 vm_page_aflag_clear(m, PGA_WRITEABLE); 4537 } 4538 pmap_unuse_pt(pmap, pv->pv_va, &free); 4539 } 4540 } 4541 } 4542 if (allfree) { 4543 TAILQ_REMOVE(&pmap->pm_pvchunk, pc, pc_list); 4544 free_pv_chunk(pc); 4545 } 4546 } 4547 sched_unpin(); 4548 pmap_invalidate_all(pmap); 4549 rw_wunlock(&pvh_global_lock); 4550 PMAP_UNLOCK(pmap); 4551 pmap_free_zero_pages(free); 4552} 4553 4554/* 4555 * pmap_is_modified: 4556 * 4557 * Return whether or not the specified physical page was modified 4558 * in any physical maps. 4559 */ 4560boolean_t 4561pmap_is_modified(vm_page_t m) 4562{ 4563 boolean_t rv; 4564 4565 KASSERT((m->oflags & VPO_UNMANAGED) == 0, 4566 ("pmap_is_modified: page %p is not managed", m)); 4567 4568 /* 4569 * If the page is not VPO_BUSY, then PGA_WRITEABLE cannot be 4570 * concurrently set while the object is locked. Thus, if PGA_WRITEABLE 4571 * is clear, no PTEs can have PG_M set. 4572 */ 4573 VM_OBJECT_LOCK_ASSERT(m->object, MA_OWNED); 4574 if ((m->oflags & VPO_BUSY) == 0 && 4575 (m->aflags & PGA_WRITEABLE) == 0) 4576 return (FALSE); 4577 rw_wlock(&pvh_global_lock); 4578 rv = pmap_is_modified_pvh(&m->md) || 4579 ((m->flags & PG_FICTITIOUS) == 0 && 4580 pmap_is_modified_pvh(pa_to_pvh(VM_PAGE_TO_PHYS(m)))); 4581 rw_wunlock(&pvh_global_lock); 4582 return (rv); 4583} 4584 4585/* 4586 * Returns TRUE if any of the given mappings were used to modify 4587 * physical memory. Otherwise, returns FALSE. Both page and 2mpage 4588 * mappings are supported. 4589 */ 4590static boolean_t 4591pmap_is_modified_pvh(struct md_page *pvh) 4592{ 4593 pv_entry_t pv; 4594 pt_entry_t *pte; 4595 pmap_t pmap; 4596 boolean_t rv; 4597 4598 rw_assert(&pvh_global_lock, RA_WLOCKED); 4599 rv = FALSE; 4600 sched_pin(); 4601 TAILQ_FOREACH(pv, &pvh->pv_list, pv_list) { 4602 pmap = PV_PMAP(pv); 4603 PMAP_LOCK(pmap); 4604 pte = pmap_pte_quick(pmap, pv->pv_va); 4605 rv = (*pte & (PG_M | PG_RW)) == (PG_M | PG_RW); 4606 PMAP_UNLOCK(pmap); 4607 if (rv) 4608 break; 4609 } 4610 sched_unpin(); 4611 return (rv); 4612} 4613 4614/* 4615 * pmap_is_prefaultable: 4616 * 4617 * Return whether or not the specified virtual address is elgible 4618 * for prefault. 4619 */ 4620boolean_t 4621pmap_is_prefaultable(pmap_t pmap, vm_offset_t addr) 4622{ 4623 pd_entry_t *pde; 4624 pt_entry_t *pte; 4625 boolean_t rv; 4626 4627 rv = FALSE; 4628 PMAP_LOCK(pmap); 4629 pde = pmap_pde(pmap, addr); 4630 if (*pde != 0 && (*pde & PG_PS) == 0) { 4631 pte = vtopte(addr); 4632 rv = *pte == 0; 4633 } 4634 PMAP_UNLOCK(pmap); 4635 return (rv); 4636} 4637 4638/* 4639 * pmap_is_referenced: 4640 * 4641 * Return whether or not the specified physical page was referenced 4642 * in any physical maps. 4643 */ 4644boolean_t 4645pmap_is_referenced(vm_page_t m) 4646{ 4647 boolean_t rv; 4648 4649 KASSERT((m->oflags & VPO_UNMANAGED) == 0, 4650 ("pmap_is_referenced: page %p is not managed", m)); 4651 rw_wlock(&pvh_global_lock); 4652 rv = pmap_is_referenced_pvh(&m->md) || 4653 ((m->flags & PG_FICTITIOUS) == 0 && 4654 pmap_is_referenced_pvh(pa_to_pvh(VM_PAGE_TO_PHYS(m)))); 4655 rw_wunlock(&pvh_global_lock); 4656 return (rv); 4657} 4658 4659/* 4660 * Returns TRUE if any of the given mappings were referenced and FALSE 4661 * otherwise. Both page and 4mpage mappings are supported. 4662 */ 4663static boolean_t 4664pmap_is_referenced_pvh(struct md_page *pvh) 4665{ 4666 pv_entry_t pv; 4667 pt_entry_t *pte; 4668 pmap_t pmap; 4669 boolean_t rv; 4670 4671 rw_assert(&pvh_global_lock, RA_WLOCKED); 4672 rv = FALSE; 4673 sched_pin(); 4674 TAILQ_FOREACH(pv, &pvh->pv_list, pv_list) { 4675 pmap = PV_PMAP(pv); 4676 PMAP_LOCK(pmap); 4677 pte = pmap_pte_quick(pmap, pv->pv_va); 4678 rv = (*pte & (PG_A | PG_V)) == (PG_A | PG_V); 4679 PMAP_UNLOCK(pmap); 4680 if (rv) 4681 break; 4682 } 4683 sched_unpin(); 4684 return (rv); 4685} 4686 4687/* 4688 * Clear the write and modified bits in each of the given page's mappings. 4689 */ 4690void 4691pmap_remove_write(vm_page_t m) 4692{ 4693 struct md_page *pvh; 4694 pv_entry_t next_pv, pv; 4695 pmap_t pmap; 4696 pd_entry_t *pde; 4697 pt_entry_t oldpte, *pte; 4698 vm_offset_t va; 4699 4700 KASSERT((m->oflags & VPO_UNMANAGED) == 0, 4701 ("pmap_remove_write: page %p is not managed", m)); 4702 4703 /* 4704 * If the page is not VPO_BUSY, then PGA_WRITEABLE cannot be set by 4705 * another thread while the object is locked. Thus, if PGA_WRITEABLE 4706 * is clear, no page table entries need updating. 4707 */ 4708 VM_OBJECT_LOCK_ASSERT(m->object, MA_OWNED); 4709 if ((m->oflags & VPO_BUSY) == 0 && 4710 (m->aflags & PGA_WRITEABLE) == 0) 4711 return; 4712 rw_wlock(&pvh_global_lock); 4713 sched_pin(); 4714 if ((m->flags & PG_FICTITIOUS) != 0) 4715 goto small_mappings; 4716 pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m)); 4717 TAILQ_FOREACH_SAFE(pv, &pvh->pv_list, pv_list, next_pv) { 4718 va = pv->pv_va; 4719 pmap = PV_PMAP(pv); 4720 PMAP_LOCK(pmap); 4721 pde = pmap_pde(pmap, va); 4722 if ((*pde & PG_RW) != 0) 4723 (void)pmap_demote_pde(pmap, pde, va); 4724 PMAP_UNLOCK(pmap); 4725 } 4726small_mappings: 4727 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 4728 pmap = PV_PMAP(pv); 4729 PMAP_LOCK(pmap); 4730 pde = pmap_pde(pmap, pv->pv_va); 4731 KASSERT((*pde & PG_PS) == 0, ("pmap_clear_write: found" 4732 " a 4mpage in page %p's pv list", m)); 4733 pte = pmap_pte_quick(pmap, pv->pv_va); 4734retry: 4735 oldpte = *pte; 4736 if ((oldpte & PG_RW) != 0) { 4737 /* 4738 * Regardless of whether a pte is 32 or 64 bits 4739 * in size, PG_RW and PG_M are among the least 4740 * significant 32 bits. 4741 */ 4742 if (!atomic_cmpset_int((u_int *)pte, oldpte, 4743 oldpte & ~(PG_RW | PG_M))) 4744 goto retry; 4745 if ((oldpte & PG_M) != 0) 4746 vm_page_dirty(m); 4747 pmap_invalidate_page(pmap, pv->pv_va); 4748 } 4749 PMAP_UNLOCK(pmap); 4750 } 4751 vm_page_aflag_clear(m, PGA_WRITEABLE); 4752 sched_unpin(); 4753 rw_wunlock(&pvh_global_lock); 4754} 4755 4756/* 4757 * pmap_ts_referenced: 4758 * 4759 * Return a count of reference bits for a page, clearing those bits. 4760 * It is not necessary for every reference bit to be cleared, but it 4761 * is necessary that 0 only be returned when there are truly no 4762 * reference bits set. 4763 * 4764 * XXX: The exact number of bits to check and clear is a matter that 4765 * should be tested and standardized at some point in the future for 4766 * optimal aging of shared pages. 4767 */ 4768int 4769pmap_ts_referenced(vm_page_t m) 4770{ 4771 struct md_page *pvh; 4772 pv_entry_t pv, pvf, pvn; 4773 pmap_t pmap; 4774 pd_entry_t oldpde, *pde; 4775 pt_entry_t *pte; 4776 vm_offset_t va; 4777 int rtval = 0; 4778 4779 KASSERT((m->oflags & VPO_UNMANAGED) == 0, 4780 ("pmap_ts_referenced: page %p is not managed", m)); 4781 pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m)); 4782 rw_wlock(&pvh_global_lock); 4783 sched_pin(); 4784 if ((m->flags & PG_FICTITIOUS) != 0) 4785 goto small_mappings; 4786 TAILQ_FOREACH_SAFE(pv, &pvh->pv_list, pv_list, pvn) { 4787 va = pv->pv_va; 4788 pmap = PV_PMAP(pv); 4789 PMAP_LOCK(pmap); 4790 pde = pmap_pde(pmap, va); 4791 oldpde = *pde; 4792 if ((oldpde & PG_A) != 0) { 4793 if (pmap_demote_pde(pmap, pde, va)) { 4794 if ((oldpde & PG_W) == 0) { 4795 /* 4796 * Remove the mapping to a single page 4797 * so that a subsequent access may 4798 * repromote. Since the underlying 4799 * page table page is fully populated, 4800 * this removal never frees a page 4801 * table page. 4802 */ 4803 va += VM_PAGE_TO_PHYS(m) - (oldpde & 4804 PG_PS_FRAME); 4805 pmap_remove_page(pmap, va, NULL); 4806 rtval++; 4807 if (rtval > 4) { 4808 PMAP_UNLOCK(pmap); 4809 goto out; 4810 } 4811 } 4812 } 4813 } 4814 PMAP_UNLOCK(pmap); 4815 } 4816small_mappings: 4817 if ((pv = TAILQ_FIRST(&m->md.pv_list)) != NULL) { 4818 pvf = pv; 4819 do { 4820 pvn = TAILQ_NEXT(pv, pv_list); 4821 TAILQ_REMOVE(&m->md.pv_list, pv, pv_list); 4822 TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list); 4823 pmap = PV_PMAP(pv); 4824 PMAP_LOCK(pmap); 4825 pde = pmap_pde(pmap, pv->pv_va); 4826 KASSERT((*pde & PG_PS) == 0, ("pmap_ts_referenced:" 4827 " found a 4mpage in page %p's pv list", m)); 4828 pte = pmap_pte_quick(pmap, pv->pv_va); 4829 if ((*pte & PG_A) != 0) { 4830 atomic_clear_int((u_int *)pte, PG_A); 4831 pmap_invalidate_page(pmap, pv->pv_va); 4832 rtval++; 4833 if (rtval > 4) 4834 pvn = NULL; 4835 } 4836 PMAP_UNLOCK(pmap); 4837 } while ((pv = pvn) != NULL && pv != pvf); 4838 } 4839out: 4840 sched_unpin(); 4841 rw_wunlock(&pvh_global_lock); 4842 return (rtval); 4843} 4844 4845/* 4846 * Clear the modify bits on the specified physical page. 4847 */ 4848void 4849pmap_clear_modify(vm_page_t m) 4850{ 4851 struct md_page *pvh; 4852 pv_entry_t next_pv, pv; 4853 pmap_t pmap; 4854 pd_entry_t oldpde, *pde; 4855 pt_entry_t oldpte, *pte; 4856 vm_offset_t va; 4857 4858 KASSERT((m->oflags & VPO_UNMANAGED) == 0, 4859 ("pmap_clear_modify: page %p is not managed", m)); 4860 VM_OBJECT_LOCK_ASSERT(m->object, MA_OWNED); 4861 KASSERT((m->oflags & VPO_BUSY) == 0, 4862 ("pmap_clear_modify: page %p is busy", m)); 4863 4864 /* 4865 * If the page is not PGA_WRITEABLE, then no PTEs can have PG_M set. 4866 * If the object containing the page is locked and the page is not 4867 * VPO_BUSY, then PGA_WRITEABLE cannot be concurrently set. 4868 */ 4869 if ((m->aflags & PGA_WRITEABLE) == 0) 4870 return; 4871 rw_wlock(&pvh_global_lock); 4872 sched_pin(); 4873 if ((m->flags & PG_FICTITIOUS) != 0) 4874 goto small_mappings; 4875 pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m)); 4876 TAILQ_FOREACH_SAFE(pv, &pvh->pv_list, pv_list, next_pv) { 4877 va = pv->pv_va; 4878 pmap = PV_PMAP(pv); 4879 PMAP_LOCK(pmap); 4880 pde = pmap_pde(pmap, va); 4881 oldpde = *pde; 4882 if ((oldpde & PG_RW) != 0) { 4883 if (pmap_demote_pde(pmap, pde, va)) { 4884 if ((oldpde & PG_W) == 0) { 4885 /* 4886 * Write protect the mapping to a 4887 * single page so that a subsequent 4888 * write access may repromote. 4889 */ 4890 va += VM_PAGE_TO_PHYS(m) - (oldpde & 4891 PG_PS_FRAME); 4892 pte = pmap_pte_quick(pmap, va); 4893 oldpte = *pte; 4894 if ((oldpte & PG_V) != 0) { 4895 /* 4896 * Regardless of whether a pte is 32 or 64 bits 4897 * in size, PG_RW and PG_M are among the least 4898 * significant 32 bits. 4899 */ 4900 while (!atomic_cmpset_int((u_int *)pte, 4901 oldpte, 4902 oldpte & ~(PG_M | PG_RW))) 4903 oldpte = *pte; 4904 vm_page_dirty(m); 4905 pmap_invalidate_page(pmap, va); 4906 } 4907 } 4908 } 4909 } 4910 PMAP_UNLOCK(pmap); 4911 } 4912small_mappings: 4913 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 4914 pmap = PV_PMAP(pv); 4915 PMAP_LOCK(pmap); 4916 pde = pmap_pde(pmap, pv->pv_va); 4917 KASSERT((*pde & PG_PS) == 0, ("pmap_clear_modify: found" 4918 " a 4mpage in page %p's pv list", m)); 4919 pte = pmap_pte_quick(pmap, pv->pv_va); 4920 if ((*pte & (PG_M | PG_RW)) == (PG_M | PG_RW)) { 4921 /* 4922 * Regardless of whether a pte is 32 or 64 bits 4923 * in size, PG_M is among the least significant 4924 * 32 bits. 4925 */ 4926 atomic_clear_int((u_int *)pte, PG_M); 4927 pmap_invalidate_page(pmap, pv->pv_va); 4928 } 4929 PMAP_UNLOCK(pmap); 4930 } 4931 sched_unpin(); 4932 rw_wunlock(&pvh_global_lock); 4933} 4934 4935/* 4936 * pmap_clear_reference: 4937 * 4938 * Clear the reference bit on the specified physical page. 4939 */ 4940void 4941pmap_clear_reference(vm_page_t m) 4942{ 4943 struct md_page *pvh; 4944 pv_entry_t next_pv, pv; 4945 pmap_t pmap; 4946 pd_entry_t oldpde, *pde; 4947 pt_entry_t *pte; 4948 vm_offset_t va; 4949 4950 KASSERT((m->oflags & VPO_UNMANAGED) == 0, 4951 ("pmap_clear_reference: page %p is not managed", m)); 4952 rw_wlock(&pvh_global_lock); 4953 sched_pin(); 4954 if ((m->flags & PG_FICTITIOUS) != 0) 4955 goto small_mappings; 4956 pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m)); 4957 TAILQ_FOREACH_SAFE(pv, &pvh->pv_list, pv_list, next_pv) { 4958 va = pv->pv_va; 4959 pmap = PV_PMAP(pv); 4960 PMAP_LOCK(pmap); 4961 pde = pmap_pde(pmap, va); 4962 oldpde = *pde; 4963 if ((oldpde & PG_A) != 0) { 4964 if (pmap_demote_pde(pmap, pde, va)) { 4965 /* 4966 * Remove the mapping to a single page so 4967 * that a subsequent access may repromote. 4968 * Since the underlying page table page is 4969 * fully populated, this removal never frees 4970 * a page table page. 4971 */ 4972 va += VM_PAGE_TO_PHYS(m) - (oldpde & 4973 PG_PS_FRAME); 4974 pmap_remove_page(pmap, va, NULL); 4975 } 4976 } 4977 PMAP_UNLOCK(pmap); 4978 } 4979small_mappings: 4980 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 4981 pmap = PV_PMAP(pv); 4982 PMAP_LOCK(pmap); 4983 pde = pmap_pde(pmap, pv->pv_va); 4984 KASSERT((*pde & PG_PS) == 0, ("pmap_clear_reference: found" 4985 " a 4mpage in page %p's pv list", m)); 4986 pte = pmap_pte_quick(pmap, pv->pv_va); 4987 if ((*pte & PG_A) != 0) { 4988 /* 4989 * Regardless of whether a pte is 32 or 64 bits 4990 * in size, PG_A is among the least significant 4991 * 32 bits. 4992 */ 4993 atomic_clear_int((u_int *)pte, PG_A); 4994 pmap_invalidate_page(pmap, pv->pv_va); 4995 } 4996 PMAP_UNLOCK(pmap); 4997 } 4998 sched_unpin(); 4999 rw_wunlock(&pvh_global_lock); 5000} 5001 5002/* 5003 * Miscellaneous support routines follow 5004 */ 5005 5006/* Adjust the cache mode for a 4KB page mapped via a PTE. */ 5007static __inline void 5008pmap_pte_attr(pt_entry_t *pte, int cache_bits) 5009{ 5010 u_int opte, npte; 5011 5012 /* 5013 * The cache mode bits are all in the low 32-bits of the 5014 * PTE, so we can just spin on updating the low 32-bits. 5015 */ 5016 do { 5017 opte = *(u_int *)pte; 5018 npte = opte & ~PG_PTE_CACHE; 5019 npte |= cache_bits; 5020 } while (npte != opte && !atomic_cmpset_int((u_int *)pte, opte, npte)); 5021} 5022 5023/* Adjust the cache mode for a 2/4MB page mapped via a PDE. */ 5024static __inline void 5025pmap_pde_attr(pd_entry_t *pde, int cache_bits) 5026{ 5027 u_int opde, npde; 5028 5029 /* 5030 * The cache mode bits are all in the low 32-bits of the 5031 * PDE, so we can just spin on updating the low 32-bits. 5032 */ 5033 do { 5034 opde = *(u_int *)pde; 5035 npde = opde & ~PG_PDE_CACHE; 5036 npde |= cache_bits; 5037 } while (npde != opde && !atomic_cmpset_int((u_int *)pde, opde, npde)); 5038} 5039 5040/* 5041 * Map a set of physical memory pages into the kernel virtual 5042 * address space. Return a pointer to where it is mapped. This 5043 * routine is intended to be used for mapping device memory, 5044 * NOT real memory. 5045 */ 5046void * 5047pmap_mapdev_attr(vm_paddr_t pa, vm_size_t size, int mode) 5048{ 5049 vm_offset_t va, offset; 5050 vm_size_t tmpsize; 5051 5052 offset = pa & PAGE_MASK; 5053 size = roundup(offset + size, PAGE_SIZE); 5054 pa = pa & PG_FRAME; 5055 5056 if (pa < KERNLOAD && pa + size <= KERNLOAD) 5057 va = KERNBASE + pa; 5058 else 5059 va = kmem_alloc_nofault(kernel_map, size); 5060 if (!va) 5061 panic("pmap_mapdev: Couldn't alloc kernel virtual memory"); 5062 5063 for (tmpsize = 0; tmpsize < size; tmpsize += PAGE_SIZE) 5064 pmap_kenter_attr(va + tmpsize, pa + tmpsize, mode); 5065 pmap_invalidate_range(kernel_pmap, va, va + tmpsize); 5066 pmap_invalidate_cache_range(va, va + size); 5067 return ((void *)(va + offset)); 5068} 5069 5070void * 5071pmap_mapdev(vm_paddr_t pa, vm_size_t size) 5072{ 5073 5074 return (pmap_mapdev_attr(pa, size, PAT_UNCACHEABLE)); 5075} 5076 5077void * 5078pmap_mapbios(vm_paddr_t pa, vm_size_t size) 5079{ 5080 5081 return (pmap_mapdev_attr(pa, size, PAT_WRITE_BACK)); 5082} 5083 5084void 5085pmap_unmapdev(vm_offset_t va, vm_size_t size) 5086{ 5087 vm_offset_t base, offset; 5088 5089 if (va >= KERNBASE && va + size <= KERNBASE + KERNLOAD) 5090 return; 5091 base = trunc_page(va); 5092 offset = va & PAGE_MASK; 5093 size = roundup(offset + size, PAGE_SIZE); 5094 kmem_free(kernel_map, base, size); 5095} 5096 5097/* 5098 * Sets the memory attribute for the specified page. 5099 */ 5100void 5101pmap_page_set_memattr(vm_page_t m, vm_memattr_t ma) 5102{ 5103 5104 m->md.pat_mode = ma; 5105 if ((m->flags & PG_FICTITIOUS) != 0) 5106 return; 5107 5108 /* 5109 * If "m" is a normal page, flush it from the cache. 5110 * See pmap_invalidate_cache_range(). 5111 * 5112 * First, try to find an existing mapping of the page by sf 5113 * buffer. sf_buf_invalidate_cache() modifies mapping and 5114 * flushes the cache. 5115 */ 5116 if (sf_buf_invalidate_cache(m)) 5117 return; 5118 5119 /* 5120 * If page is not mapped by sf buffer, but CPU does not 5121 * support self snoop, map the page transient and do 5122 * invalidation. In the worst case, whole cache is flushed by 5123 * pmap_invalidate_cache_range(). 5124 */ 5125 if ((cpu_feature & CPUID_SS) == 0) 5126 pmap_flush_page(m); 5127} 5128 5129static void 5130pmap_flush_page(vm_page_t m) 5131{ 5132 struct sysmaps *sysmaps; 5133 vm_offset_t sva, eva; 5134 5135 if ((cpu_feature & CPUID_CLFSH) != 0) { 5136 sysmaps = &sysmaps_pcpu[PCPU_GET(cpuid)]; 5137 mtx_lock(&sysmaps->lock); 5138 if (*sysmaps->CMAP2) 5139 panic("pmap_flush_page: CMAP2 busy"); 5140 sched_pin(); 5141 *sysmaps->CMAP2 = PG_V | PG_RW | VM_PAGE_TO_PHYS(m) | 5142 PG_A | PG_M | pmap_cache_bits(m->md.pat_mode, 0); 5143 invlcaddr(sysmaps->CADDR2); 5144 sva = (vm_offset_t)sysmaps->CADDR2; 5145 eva = sva + PAGE_SIZE; 5146 5147 /* 5148 * Use mfence despite the ordering implied by 5149 * mtx_{un,}lock() because clflush is not guaranteed 5150 * to be ordered by any other instruction. 5151 */ 5152 mfence(); 5153 for (; sva < eva; sva += cpu_clflush_line_size) 5154 clflush(sva); 5155 mfence(); 5156 *sysmaps->CMAP2 = 0; 5157 sched_unpin(); 5158 mtx_unlock(&sysmaps->lock); 5159 } else 5160 pmap_invalidate_cache(); 5161} 5162 5163/* 5164 * Changes the specified virtual address range's memory type to that given by 5165 * the parameter "mode". The specified virtual address range must be 5166 * completely contained within either the kernel map. 5167 * 5168 * Returns zero if the change completed successfully, and either EINVAL or 5169 * ENOMEM if the change failed. Specifically, EINVAL is returned if some part 5170 * of the virtual address range was not mapped, and ENOMEM is returned if 5171 * there was insufficient memory available to complete the change. 5172 */ 5173int 5174pmap_change_attr(vm_offset_t va, vm_size_t size, int mode) 5175{ 5176 vm_offset_t base, offset, tmpva; 5177 pd_entry_t *pde; 5178 pt_entry_t *pte; 5179 int cache_bits_pte, cache_bits_pde; 5180 boolean_t changed; 5181 5182 base = trunc_page(va); 5183 offset = va & PAGE_MASK; 5184 size = roundup(offset + size, PAGE_SIZE); 5185 5186 /* 5187 * Only supported on kernel virtual addresses above the recursive map. 5188 */ 5189 if (base < VM_MIN_KERNEL_ADDRESS) 5190 return (EINVAL); 5191 5192 cache_bits_pde = pmap_cache_bits(mode, 1); 5193 cache_bits_pte = pmap_cache_bits(mode, 0); 5194 changed = FALSE; 5195 5196 /* 5197 * Pages that aren't mapped aren't supported. Also break down 5198 * 2/4MB pages into 4KB pages if required. 5199 */ 5200 PMAP_LOCK(kernel_pmap); 5201 for (tmpva = base; tmpva < base + size; ) { 5202 pde = pmap_pde(kernel_pmap, tmpva); 5203 if (*pde == 0) { 5204 PMAP_UNLOCK(kernel_pmap); 5205 return (EINVAL); 5206 } 5207 if (*pde & PG_PS) { 5208 /* 5209 * If the current 2/4MB page already has 5210 * the required memory type, then we need not 5211 * demote this page. Just increment tmpva to 5212 * the next 2/4MB page frame. 5213 */ 5214 if ((*pde & PG_PDE_CACHE) == cache_bits_pde) { 5215 tmpva = trunc_4mpage(tmpva) + NBPDR; 5216 continue; 5217 } 5218 5219 /* 5220 * If the current offset aligns with a 2/4MB 5221 * page frame and there is at least 2/4MB left 5222 * within the range, then we need not break 5223 * down this page into 4KB pages. 5224 */ 5225 if ((tmpva & PDRMASK) == 0 && 5226 tmpva + PDRMASK < base + size) { 5227 tmpva += NBPDR; 5228 continue; 5229 } 5230 if (!pmap_demote_pde(kernel_pmap, pde, tmpva)) { 5231 PMAP_UNLOCK(kernel_pmap); 5232 return (ENOMEM); 5233 } 5234 } 5235 pte = vtopte(tmpva); 5236 if (*pte == 0) { 5237 PMAP_UNLOCK(kernel_pmap); 5238 return (EINVAL); 5239 } 5240 tmpva += PAGE_SIZE; 5241 } 5242 PMAP_UNLOCK(kernel_pmap); 5243 5244 /* 5245 * Ok, all the pages exist, so run through them updating their 5246 * cache mode if required. 5247 */ 5248 for (tmpva = base; tmpva < base + size; ) { 5249 pde = pmap_pde(kernel_pmap, tmpva); 5250 if (*pde & PG_PS) { 5251 if ((*pde & PG_PDE_CACHE) != cache_bits_pde) { 5252 pmap_pde_attr(pde, cache_bits_pde); 5253 changed = TRUE; 5254 } 5255 tmpva = trunc_4mpage(tmpva) + NBPDR; 5256 } else { 5257 pte = vtopte(tmpva); 5258 if ((*pte & PG_PTE_CACHE) != cache_bits_pte) { 5259 pmap_pte_attr(pte, cache_bits_pte); 5260 changed = TRUE; 5261 } 5262 tmpva += PAGE_SIZE; 5263 } 5264 } 5265 5266 /* 5267 * Flush CPU caches to make sure any data isn't cached that 5268 * shouldn't be, etc. 5269 */ 5270 if (changed) { 5271 pmap_invalidate_range(kernel_pmap, base, tmpva); 5272 pmap_invalidate_cache_range(base, tmpva); 5273 } 5274 return (0); 5275} 5276 5277/* 5278 * perform the pmap work for mincore 5279 */ 5280int 5281pmap_mincore(pmap_t pmap, vm_offset_t addr, vm_paddr_t *locked_pa) 5282{ 5283 pd_entry_t *pdep; 5284 pt_entry_t *ptep, pte; 5285 vm_paddr_t pa; 5286 int val; 5287 5288 PMAP_LOCK(pmap); 5289retry: 5290 pdep = pmap_pde(pmap, addr); 5291 if (*pdep != 0) { 5292 if (*pdep & PG_PS) { 5293 pte = *pdep; 5294 /* Compute the physical address of the 4KB page. */ 5295 pa = ((*pdep & PG_PS_FRAME) | (addr & PDRMASK)) & 5296 PG_FRAME; 5297 val = MINCORE_SUPER; 5298 } else { 5299 ptep = pmap_pte(pmap, addr); 5300 pte = *ptep; 5301 pmap_pte_release(ptep); 5302 pa = pte & PG_FRAME; 5303 val = 0; 5304 } 5305 } else { 5306 pte = 0; 5307 pa = 0; 5308 val = 0; 5309 } 5310 if ((pte & PG_V) != 0) { 5311 val |= MINCORE_INCORE; 5312 if ((pte & (PG_M | PG_RW)) == (PG_M | PG_RW)) 5313 val |= MINCORE_MODIFIED | MINCORE_MODIFIED_OTHER; 5314 if ((pte & PG_A) != 0) 5315 val |= MINCORE_REFERENCED | MINCORE_REFERENCED_OTHER; 5316 } 5317 if ((val & (MINCORE_MODIFIED_OTHER | MINCORE_REFERENCED_OTHER)) != 5318 (MINCORE_MODIFIED_OTHER | MINCORE_REFERENCED_OTHER) && 5319 (pte & (PG_MANAGED | PG_V)) == (PG_MANAGED | PG_V)) { 5320 /* Ensure that "PHYS_TO_VM_PAGE(pa)->object" doesn't change. */ 5321 if (vm_page_pa_tryrelock(pmap, pa, locked_pa)) 5322 goto retry; 5323 } else 5324 PA_UNLOCK_COND(*locked_pa); 5325 PMAP_UNLOCK(pmap); 5326 return (val); 5327} 5328 5329void 5330pmap_activate(struct thread *td) 5331{ 5332 pmap_t pmap, oldpmap; 5333 u_int cpuid; 5334 u_int32_t cr3; 5335 5336 critical_enter(); 5337 pmap = vmspace_pmap(td->td_proc->p_vmspace); 5338 oldpmap = PCPU_GET(curpmap); 5339 cpuid = PCPU_GET(cpuid); 5340#if defined(SMP) 5341 CPU_CLR_ATOMIC(cpuid, &oldpmap->pm_active); 5342 CPU_SET_ATOMIC(cpuid, &pmap->pm_active); 5343#else 5344 CPU_CLR(cpuid, &oldpmap->pm_active); 5345 CPU_SET(cpuid, &pmap->pm_active); 5346#endif 5347#ifdef PAE 5348 cr3 = vtophys(pmap->pm_pdpt); 5349#else 5350 cr3 = vtophys(pmap->pm_pdir); 5351#endif 5352 /* 5353 * pmap_activate is for the current thread on the current cpu 5354 */ 5355 td->td_pcb->pcb_cr3 = cr3; 5356 load_cr3(cr3); 5357 PCPU_SET(curpmap, pmap); 5358 critical_exit(); 5359} 5360 5361void 5362pmap_sync_icache(pmap_t pm, vm_offset_t va, vm_size_t sz) 5363{ 5364} 5365 5366/* 5367 * Increase the starting virtual address of the given mapping if a 5368 * different alignment might result in more superpage mappings. 5369 */ 5370void 5371pmap_align_superpage(vm_object_t object, vm_ooffset_t offset, 5372 vm_offset_t *addr, vm_size_t size) 5373{ 5374 vm_offset_t superpage_offset; 5375 5376 if (size < NBPDR) 5377 return; 5378 if (object != NULL && (object->flags & OBJ_COLORED) != 0) 5379 offset += ptoa(object->pg_color); 5380 superpage_offset = offset & PDRMASK; 5381 if (size - ((NBPDR - superpage_offset) & PDRMASK) < NBPDR || 5382 (*addr & PDRMASK) == superpage_offset) 5383 return; 5384 if ((*addr & PDRMASK) < superpage_offset) 5385 *addr = (*addr & ~PDRMASK) + superpage_offset; 5386 else 5387 *addr = ((*addr + PDRMASK) & ~PDRMASK) + superpage_offset; 5388} 5389 5390 5391#if defined(PMAP_DEBUG) 5392pmap_pid_dump(int pid) 5393{ 5394 pmap_t pmap; 5395 struct proc *p; 5396 int npte = 0; 5397 int index; 5398 5399 sx_slock(&allproc_lock); 5400 FOREACH_PROC_IN_SYSTEM(p) { 5401 if (p->p_pid != pid) 5402 continue; 5403 5404 if (p->p_vmspace) { 5405 int i,j; 5406 index = 0; 5407 pmap = vmspace_pmap(p->p_vmspace); 5408 for (i = 0; i < NPDEPTD; i++) { 5409 pd_entry_t *pde; 5410 pt_entry_t *pte; 5411 vm_offset_t base = i << PDRSHIFT; 5412 5413 pde = &pmap->pm_pdir[i]; 5414 if (pde && pmap_pde_v(pde)) { 5415 for (j = 0; j < NPTEPG; j++) { 5416 vm_offset_t va = base + (j << PAGE_SHIFT); 5417 if (va >= (vm_offset_t) VM_MIN_KERNEL_ADDRESS) { 5418 if (index) { 5419 index = 0; 5420 printf("\n"); 5421 } 5422 sx_sunlock(&allproc_lock); 5423 return (npte); 5424 } 5425 pte = pmap_pte(pmap, va); 5426 if (pte && pmap_pte_v(pte)) { 5427 pt_entry_t pa; 5428 vm_page_t m; 5429 pa = *pte; 5430 m = PHYS_TO_VM_PAGE(pa & PG_FRAME); 5431 printf("va: 0x%x, pt: 0x%x, h: %d, w: %d, f: 0x%x", 5432 va, pa, m->hold_count, m->wire_count, m->flags); 5433 npte++; 5434 index++; 5435 if (index >= 2) { 5436 index = 0; 5437 printf("\n"); 5438 } else { 5439 printf(" "); 5440 } 5441 } 5442 } 5443 } 5444 } 5445 } 5446 } 5447 sx_sunlock(&allproc_lock); 5448 return (npte); 5449} 5450#endif 5451 5452#if defined(DEBUG) 5453 5454static void pads(pmap_t pm); 5455void pmap_pvdump(vm_paddr_t pa); 5456 5457/* print address space of pmap*/ 5458static void 5459pads(pmap_t pm) 5460{ 5461 int i, j; 5462 vm_paddr_t va; 5463 pt_entry_t *ptep; 5464 5465 if (pm == kernel_pmap) 5466 return; 5467 for (i = 0; i < NPDEPTD; i++) 5468 if (pm->pm_pdir[i]) 5469 for (j = 0; j < NPTEPG; j++) { 5470 va = (i << PDRSHIFT) + (j << PAGE_SHIFT); 5471 if (pm == kernel_pmap && va < KERNBASE) 5472 continue; 5473 if (pm != kernel_pmap && va > UPT_MAX_ADDRESS) 5474 continue; 5475 ptep = pmap_pte(pm, va); 5476 if (pmap_pte_v(ptep)) 5477 printf("%x:%x ", va, *ptep); 5478 }; 5479 5480} 5481 5482void 5483pmap_pvdump(vm_paddr_t pa) 5484{ 5485 pv_entry_t pv; 5486 pmap_t pmap; 5487 vm_page_t m; 5488 5489 printf("pa %x", pa); 5490 m = PHYS_TO_VM_PAGE(pa); 5491 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 5492 pmap = PV_PMAP(pv); 5493 printf(" -> pmap %p, va %x", (void *)pmap, pv->pv_va); 5494 pads(pmap); 5495 } 5496 printf(" "); 5497} 5498#endif 5499