pmap.c revision 215470
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 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: head/sys/i386/xen/pmap.c 215470 2010-11-18 21:02:40Z cperciva $"); 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_cpu.h" 107#include "opt_pmap.h" 108#include "opt_msgbuf.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/sf_buf.h> 123#include <sys/sx.h> 124#include <sys/vmmeter.h> 125#include <sys/sched.h> 126#include <sys/sysctl.h> 127#ifdef SMP 128#include <sys/smp.h> 129#endif 130 131#include <vm/vm.h> 132#include <vm/vm_param.h> 133#include <vm/vm_kern.h> 134#include <vm/vm_page.h> 135#include <vm/vm_map.h> 136#include <vm/vm_object.h> 137#include <vm/vm_extern.h> 138#include <vm/vm_pageout.h> 139#include <vm/vm_pager.h> 140#include <vm/uma.h> 141 142#include <machine/cpu.h> 143#include <machine/cputypes.h> 144#include <machine/md_var.h> 145#include <machine/pcb.h> 146#include <machine/specialreg.h> 147#ifdef SMP 148#include <machine/smp.h> 149#endif 150 151#ifdef XBOX 152#include <machine/xbox.h> 153#endif 154 155#include <xen/interface/xen.h> 156#include <xen/hypervisor.h> 157#include <machine/xen/hypercall.h> 158#include <machine/xen/xenvar.h> 159#include <machine/xen/xenfunc.h> 160 161#if !defined(CPU_DISABLE_SSE) && defined(I686_CPU) 162#define CPU_ENABLE_SSE 163#endif 164 165#ifndef PMAP_SHPGPERPROC 166#define PMAP_SHPGPERPROC 200 167#endif 168 169#define DIAGNOSTIC 170 171#if !defined(DIAGNOSTIC) 172#ifdef __GNUC_GNU_INLINE__ 173#define PMAP_INLINE __attribute__((__gnu_inline__)) inline 174#else 175#define PMAP_INLINE extern inline 176#endif 177#else 178#define PMAP_INLINE 179#endif 180 181#define PV_STATS 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_prot(pte, v) ((*(int *)pte &= ~PG_PROT), (*(int *)pte |= (v))) 204 205struct pmap kernel_pmap_store; 206LIST_HEAD(pmaplist, pmap); 207static struct pmaplist allpmaps; 208static struct mtx allpmaps_lock; 209 210vm_offset_t virtual_avail; /* VA of first avail page (after kernel bss) */ 211vm_offset_t virtual_end; /* VA of last avail page (end of kernel AS) */ 212int pgeflag = 0; /* PG_G or-in */ 213int pseflag = 0; /* PG_PS or-in */ 214 215int nkpt; 216vm_offset_t kernel_vm_end; 217extern u_int32_t KERNend; 218 219#ifdef PAE 220pt_entry_t pg_nx; 221#if !defined(XEN) 222static uma_zone_t pdptzone; 223#endif 224#endif 225 226static int pat_works; /* Is page attribute table sane? */ 227 228/* 229 * Data for the pv entry allocation mechanism 230 */ 231static int pv_entry_count = 0, pv_entry_max = 0, pv_entry_high_water = 0; 232static struct md_page *pv_table; 233static int shpgperproc = PMAP_SHPGPERPROC; 234 235struct pv_chunk *pv_chunkbase; /* KVA block for pv_chunks */ 236int pv_maxchunks; /* How many chunks we have KVA for */ 237vm_offset_t pv_vafree; /* freelist stored in the PTE */ 238 239/* 240 * All those kernel PT submaps that BSD is so fond of 241 */ 242struct sysmaps { 243 struct mtx lock; 244 pt_entry_t *CMAP1; 245 pt_entry_t *CMAP2; 246 caddr_t CADDR1; 247 caddr_t CADDR2; 248}; 249static struct sysmaps sysmaps_pcpu[MAXCPU]; 250static pt_entry_t *CMAP3; 251caddr_t ptvmmap = 0; 252static caddr_t CADDR3; 253struct msgbuf *msgbufp = 0; 254 255/* 256 * Crashdump maps. 257 */ 258static caddr_t crashdumpmap; 259 260static pt_entry_t *PMAP1 = 0, *PMAP2; 261static pt_entry_t *PADDR1 = 0, *PADDR2; 262#ifdef SMP 263static int PMAP1cpu; 264static int PMAP1changedcpu; 265SYSCTL_INT(_debug, OID_AUTO, PMAP1changedcpu, CTLFLAG_RD, 266 &PMAP1changedcpu, 0, 267 "Number of times pmap_pte_quick changed CPU with same PMAP1"); 268#endif 269static int PMAP1changed; 270SYSCTL_INT(_debug, OID_AUTO, PMAP1changed, CTLFLAG_RD, 271 &PMAP1changed, 0, 272 "Number of times pmap_pte_quick changed PMAP1"); 273static int PMAP1unchanged; 274SYSCTL_INT(_debug, OID_AUTO, PMAP1unchanged, CTLFLAG_RD, 275 &PMAP1unchanged, 0, 276 "Number of times pmap_pte_quick didn't change PMAP1"); 277static struct mtx PMAP2mutex; 278 279SYSCTL_NODE(_vm, OID_AUTO, pmap, CTLFLAG_RD, 0, "VM/pmap parameters"); 280static int pg_ps_enabled; 281SYSCTL_INT(_vm_pmap, OID_AUTO, pg_ps_enabled, CTLFLAG_RDTUN, &pg_ps_enabled, 0, 282 "Are large page mappings enabled?"); 283 284SYSCTL_INT(_vm_pmap, OID_AUTO, pv_entry_max, CTLFLAG_RD, &pv_entry_max, 0, 285 "Max number of PV entries"); 286SYSCTL_INT(_vm_pmap, OID_AUTO, shpgperproc, CTLFLAG_RD, &shpgperproc, 0, 287 "Page share factor per proc"); 288SYSCTL_NODE(_vm_pmap, OID_AUTO, pde, CTLFLAG_RD, 0, 289 "2/4MB page mapping counters"); 290 291static u_long pmap_pde_mappings; 292SYSCTL_ULONG(_vm_pmap_pde, OID_AUTO, mappings, CTLFLAG_RD, 293 &pmap_pde_mappings, 0, "2/4MB page mappings"); 294 295static void free_pv_entry(pmap_t pmap, pv_entry_t pv); 296static pv_entry_t get_pv_entry(pmap_t locked_pmap, int try); 297static void pmap_pvh_free(struct md_page *pvh, pmap_t pmap, vm_offset_t va); 298static pv_entry_t pmap_pvh_remove(struct md_page *pvh, pmap_t pmap, 299 vm_offset_t va); 300 301static vm_page_t pmap_enter_quick_locked(multicall_entry_t **mcl, int *count, pmap_t pmap, vm_offset_t va, 302 vm_page_t m, vm_prot_t prot, vm_page_t mpte); 303static int pmap_remove_pte(pmap_t pmap, pt_entry_t *ptq, vm_offset_t sva, 304 vm_page_t *free); 305static void pmap_remove_page(struct pmap *pmap, vm_offset_t va, 306 vm_page_t *free); 307static void pmap_remove_entry(struct pmap *pmap, vm_page_t m, 308 vm_offset_t va); 309static boolean_t pmap_try_insert_pv_entry(pmap_t pmap, vm_offset_t va, 310 vm_page_t m); 311 312static vm_page_t pmap_allocpte(pmap_t pmap, vm_offset_t va, int flags); 313 314static vm_page_t _pmap_allocpte(pmap_t pmap, unsigned ptepindex, int flags); 315static int _pmap_unwire_pte_hold(pmap_t pmap, vm_page_t m, vm_page_t *free); 316static pt_entry_t *pmap_pte_quick(pmap_t pmap, vm_offset_t va); 317static void pmap_pte_release(pt_entry_t *pte); 318static int pmap_unuse_pt(pmap_t, vm_offset_t, vm_page_t *); 319static vm_offset_t pmap_kmem_choose(vm_offset_t addr); 320static boolean_t pmap_is_prefaultable_locked(pmap_t pmap, vm_offset_t addr); 321static void pmap_kenter_attr(vm_offset_t va, vm_paddr_t pa, int mode); 322 323static __inline void pagezero(void *page); 324 325#if defined(PAE) && !defined(XEN) 326static void *pmap_pdpt_allocf(uma_zone_t zone, int bytes, u_int8_t *flags, int wait); 327#endif 328#ifndef XEN 329static void pmap_set_pg(void); 330#endif 331 332CTASSERT(1 << PDESHIFT == sizeof(pd_entry_t)); 333CTASSERT(1 << PTESHIFT == sizeof(pt_entry_t)); 334 335/* 336 * If you get an error here, then you set KVA_PAGES wrong! See the 337 * description of KVA_PAGES in sys/i386/include/pmap.h. It must be 338 * multiple of 4 for a normal kernel, or a multiple of 8 for a PAE. 339 */ 340CTASSERT(KERNBASE % (1 << 24) == 0); 341 342 343 344void 345pd_set(struct pmap *pmap, int ptepindex, vm_paddr_t val, int type) 346{ 347 vm_paddr_t pdir_ma = vtomach(&pmap->pm_pdir[ptepindex]); 348 349 switch (type) { 350 case SH_PD_SET_VA: 351#if 0 352 xen_queue_pt_update(shadow_pdir_ma, 353 xpmap_ptom(val & ~(PG_RW))); 354#endif 355 xen_queue_pt_update(pdir_ma, 356 xpmap_ptom(val)); 357 break; 358 case SH_PD_SET_VA_MA: 359#if 0 360 xen_queue_pt_update(shadow_pdir_ma, 361 val & ~(PG_RW)); 362#endif 363 xen_queue_pt_update(pdir_ma, val); 364 break; 365 case SH_PD_SET_VA_CLEAR: 366#if 0 367 xen_queue_pt_update(shadow_pdir_ma, 0); 368#endif 369 xen_queue_pt_update(pdir_ma, 0); 370 break; 371 } 372} 373 374/* 375 * Move the kernel virtual free pointer to the next 376 * 4MB. This is used to help improve performance 377 * by using a large (4MB) page for much of the kernel 378 * (.text, .data, .bss) 379 */ 380static vm_offset_t 381pmap_kmem_choose(vm_offset_t addr) 382{ 383 vm_offset_t newaddr = addr; 384 385#ifndef DISABLE_PSE 386 if (cpu_feature & CPUID_PSE) 387 newaddr = (addr + PDRMASK) & ~PDRMASK; 388#endif 389 return newaddr; 390} 391 392/* 393 * Bootstrap the system enough to run with virtual memory. 394 * 395 * On the i386 this is called after mapping has already been enabled 396 * and just syncs the pmap module with what has already been done. 397 * [We can't call it easily with mapping off since the kernel is not 398 * mapped with PA == VA, hence we would have to relocate every address 399 * from the linked base (virtual) address "KERNBASE" to the actual 400 * (physical) address starting relative to 0] 401 */ 402void 403pmap_bootstrap(vm_paddr_t firstaddr) 404{ 405 vm_offset_t va; 406 pt_entry_t *pte, *unused; 407 struct sysmaps *sysmaps; 408 int i; 409 410 /* 411 * XXX The calculation of virtual_avail is wrong. It's NKPT*PAGE_SIZE too 412 * large. It should instead be correctly calculated in locore.s and 413 * not based on 'first' (which is a physical address, not a virtual 414 * address, for the start of unused physical memory). The kernel 415 * page tables are NOT double mapped and thus should not be included 416 * in this calculation. 417 */ 418 virtual_avail = (vm_offset_t) KERNBASE + firstaddr; 419 virtual_avail = pmap_kmem_choose(virtual_avail); 420 421 virtual_end = VM_MAX_KERNEL_ADDRESS; 422 423 /* 424 * Initialize the kernel pmap (which is statically allocated). 425 */ 426 PMAP_LOCK_INIT(kernel_pmap); 427 kernel_pmap->pm_pdir = (pd_entry_t *) (KERNBASE + (u_int)IdlePTD); 428#ifdef PAE 429 kernel_pmap->pm_pdpt = (pdpt_entry_t *) (KERNBASE + (u_int)IdlePDPT); 430#endif 431 kernel_pmap->pm_active = -1; /* don't allow deactivation */ 432 TAILQ_INIT(&kernel_pmap->pm_pvchunk); 433 LIST_INIT(&allpmaps); 434 mtx_init(&allpmaps_lock, "allpmaps", NULL, MTX_SPIN); 435 mtx_lock_spin(&allpmaps_lock); 436 LIST_INSERT_HEAD(&allpmaps, kernel_pmap, pm_list); 437 mtx_unlock_spin(&allpmaps_lock); 438 if (nkpt == 0) 439 nkpt = NKPT; 440 441 /* 442 * Reserve some special page table entries/VA space for temporary 443 * mapping of pages. 444 */ 445#define SYSMAP(c, p, v, n) \ 446 v = (c)va; va += ((n)*PAGE_SIZE); p = pte; pte += (n); 447 448 va = virtual_avail; 449 pte = vtopte(va); 450 451 /* 452 * CMAP1/CMAP2 are used for zeroing and copying pages. 453 * CMAP3 is used for the idle process page zeroing. 454 */ 455 for (i = 0; i < MAXCPU; i++) { 456 sysmaps = &sysmaps_pcpu[i]; 457 mtx_init(&sysmaps->lock, "SYSMAPS", NULL, MTX_DEF); 458 SYSMAP(caddr_t, sysmaps->CMAP1, sysmaps->CADDR1, 1) 459 SYSMAP(caddr_t, sysmaps->CMAP2, sysmaps->CADDR2, 1) 460 PT_SET_MA(sysmaps->CADDR1, 0); 461 PT_SET_MA(sysmaps->CADDR2, 0); 462 } 463 SYSMAP(caddr_t, CMAP3, CADDR3, 1) 464 PT_SET_MA(CADDR3, 0); 465 466 /* 467 * Crashdump maps. 468 */ 469 SYSMAP(caddr_t, unused, crashdumpmap, MAXDUMPPGS) 470 471 /* 472 * ptvmmap is used for reading arbitrary physical pages via /dev/mem. 473 */ 474 SYSMAP(caddr_t, unused, ptvmmap, 1) 475 476 /* 477 * msgbufp is used to map the system message buffer. 478 */ 479 SYSMAP(struct msgbuf *, unused, msgbufp, atop(round_page(MSGBUF_SIZE))) 480 481 /* 482 * ptemap is used for pmap_pte_quick 483 */ 484 SYSMAP(pt_entry_t *, PMAP1, PADDR1, 1); 485 SYSMAP(pt_entry_t *, PMAP2, PADDR2, 1); 486 487 mtx_init(&PMAP2mutex, "PMAP2", NULL, MTX_DEF); 488 489 virtual_avail = va; 490 491 /* 492 * Leave in place an identity mapping (virt == phys) for the low 1 MB 493 * physical memory region that is used by the ACPI wakeup code. This 494 * mapping must not have PG_G set. 495 */ 496#ifndef XEN 497 /* 498 * leave here deliberately to show that this is not supported 499 */ 500#ifdef XBOX 501 /* FIXME: This is gross, but needed for the XBOX. Since we are in such 502 * an early stadium, we cannot yet neatly map video memory ... :-( 503 * Better fixes are very welcome! */ 504 if (!arch_i386_is_xbox) 505#endif 506 for (i = 1; i < NKPT; i++) 507 PTD[i] = 0; 508 509 /* Initialize the PAT MSR if present. */ 510 pmap_init_pat(); 511 512 /* Turn on PG_G on kernel page(s) */ 513 pmap_set_pg(); 514#endif 515} 516 517/* 518 * Setup the PAT MSR. 519 */ 520void 521pmap_init_pat(void) 522{ 523 uint64_t pat_msr; 524 525 /* Bail if this CPU doesn't implement PAT. */ 526 if (!(cpu_feature & CPUID_PAT)) 527 return; 528 529 if (cpu_vendor_id != CPU_VENDOR_INTEL || 530 (CPUID_TO_FAMILY(cpu_id) == 6 && CPUID_TO_MODEL(cpu_id) >= 0xe)) { 531 /* 532 * Leave the indices 0-3 at the default of WB, WT, UC, and UC-. 533 * Program 4 and 5 as WP and WC. 534 * Leave 6 and 7 as UC and UC-. 535 */ 536 pat_msr = rdmsr(MSR_PAT); 537 pat_msr &= ~(PAT_MASK(4) | PAT_MASK(5)); 538 pat_msr |= PAT_VALUE(4, PAT_WRITE_PROTECTED) | 539 PAT_VALUE(5, PAT_WRITE_COMBINING); 540 pat_works = 1; 541 } else { 542 /* 543 * Due to some Intel errata, we can only safely use the lower 4 544 * PAT entries. Thus, just replace PAT Index 2 with WC instead 545 * of UC-. 546 * 547 * Intel Pentium III Processor Specification Update 548 * Errata E.27 (Upper Four PAT Entries Not Usable With Mode B 549 * or Mode C Paging) 550 * 551 * Intel Pentium IV Processor Specification Update 552 * Errata N46 (PAT Index MSB May Be Calculated Incorrectly) 553 */ 554 pat_msr = rdmsr(MSR_PAT); 555 pat_msr &= ~PAT_MASK(2); 556 pat_msr |= PAT_VALUE(2, PAT_WRITE_COMBINING); 557 pat_works = 0; 558 } 559 wrmsr(MSR_PAT, pat_msr); 560} 561 562#ifndef XEN 563/* 564 * Set PG_G on kernel pages. Only the BSP calls this when SMP is turned on. 565 */ 566static void 567pmap_set_pg(void) 568{ 569 pd_entry_t pdir; 570 pt_entry_t *pte; 571 vm_offset_t va, endva; 572 int i; 573 574 if (pgeflag == 0) 575 return; 576 577 i = KERNLOAD/NBPDR; 578 endva = KERNBASE + KERNend; 579 580 if (pseflag) { 581 va = KERNBASE + KERNLOAD; 582 while (va < endva) { 583 pdir = kernel_pmap->pm_pdir[KPTDI+i]; 584 pdir |= pgeflag; 585 kernel_pmap->pm_pdir[KPTDI+i] = PTD[KPTDI+i] = pdir; 586 invltlb(); /* Play it safe, invltlb() every time */ 587 i++; 588 va += NBPDR; 589 } 590 } else { 591 va = (vm_offset_t)btext; 592 while (va < endva) { 593 pte = vtopte(va); 594 if (*pte & PG_V) 595 *pte |= pgeflag; 596 invltlb(); /* Play it safe, invltlb() every time */ 597 va += PAGE_SIZE; 598 } 599 } 600} 601#endif 602 603/* 604 * Initialize a vm_page's machine-dependent fields. 605 */ 606void 607pmap_page_init(vm_page_t m) 608{ 609 610 TAILQ_INIT(&m->md.pv_list); 611 m->md.pat_mode = PAT_WRITE_BACK; 612} 613 614#if defined(PAE) && !defined(XEN) 615static void * 616pmap_pdpt_allocf(uma_zone_t zone, int bytes, u_int8_t *flags, int wait) 617{ 618 619 /* Inform UMA that this allocator uses kernel_map/object. */ 620 *flags = UMA_SLAB_KERNEL; 621 return ((void *)kmem_alloc_contig(kernel_map, bytes, wait, 0x0ULL, 622 0xffffffffULL, 1, 0, VM_MEMATTR_DEFAULT)); 623} 624#endif 625 626/* 627 * ABuse the pte nodes for unmapped kva to thread a kva freelist through. 628 * Requirements: 629 * - Must deal with pages in order to ensure that none of the PG_* bits 630 * are ever set, PG_V in particular. 631 * - Assumes we can write to ptes without pte_store() atomic ops, even 632 * on PAE systems. This should be ok. 633 * - Assumes nothing will ever test these addresses for 0 to indicate 634 * no mapping instead of correctly checking PG_V. 635 * - Assumes a vm_offset_t will fit in a pte (true for i386). 636 * Because PG_V is never set, there can be no mappings to invalidate. 637 */ 638static int ptelist_count = 0; 639static vm_offset_t 640pmap_ptelist_alloc(vm_offset_t *head) 641{ 642 vm_offset_t va; 643 vm_offset_t *phead = (vm_offset_t *)*head; 644 645 if (ptelist_count == 0) { 646 printf("out of memory!!!!!!\n"); 647 return (0); /* Out of memory */ 648 } 649 ptelist_count--; 650 va = phead[ptelist_count]; 651 return (va); 652} 653 654static void 655pmap_ptelist_free(vm_offset_t *head, vm_offset_t va) 656{ 657 vm_offset_t *phead = (vm_offset_t *)*head; 658 659 phead[ptelist_count++] = va; 660} 661 662static void 663pmap_ptelist_init(vm_offset_t *head, void *base, int npages) 664{ 665 int i, nstackpages; 666 vm_offset_t va; 667 vm_page_t m; 668 669 nstackpages = (npages + PAGE_SIZE/sizeof(vm_offset_t) - 1)/ (PAGE_SIZE/sizeof(vm_offset_t)); 670 for (i = 0; i < nstackpages; i++) { 671 va = (vm_offset_t)base + i * PAGE_SIZE; 672 m = vm_page_alloc(NULL, i, 673 VM_ALLOC_NORMAL | VM_ALLOC_NOOBJ | VM_ALLOC_WIRED | 674 VM_ALLOC_ZERO); 675 pmap_qenter(va, &m, 1); 676 } 677 678 *head = (vm_offset_t)base; 679 for (i = npages - 1; i >= nstackpages; i--) { 680 va = (vm_offset_t)base + i * PAGE_SIZE; 681 pmap_ptelist_free(head, va); 682 } 683} 684 685 686/* 687 * Initialize the pmap module. 688 * Called by vm_init, to initialize any structures that the pmap 689 * system needs to map virtual memory. 690 */ 691void 692pmap_init(void) 693{ 694 vm_page_t mpte; 695 vm_size_t s; 696 int i, pv_npg; 697 698 /* 699 * Initialize the vm page array entries for the kernel pmap's 700 * page table pages. 701 */ 702 for (i = 0; i < nkpt; i++) { 703 mpte = PHYS_TO_VM_PAGE(xpmap_mtop(PTD[i + KPTDI] & PG_FRAME)); 704 KASSERT(mpte >= vm_page_array && 705 mpte < &vm_page_array[vm_page_array_size], 706 ("pmap_init: page table page is out of range")); 707 mpte->pindex = i + KPTDI; 708 mpte->phys_addr = xpmap_mtop(PTD[i + KPTDI] & PG_FRAME); 709 } 710 711 /* 712 * Initialize the address space (zone) for the pv entries. Set a 713 * high water mark so that the system can recover from excessive 714 * numbers of pv entries. 715 */ 716 TUNABLE_INT_FETCH("vm.pmap.shpgperproc", &shpgperproc); 717 pv_entry_max = shpgperproc * maxproc + cnt.v_page_count; 718 TUNABLE_INT_FETCH("vm.pmap.pv_entries", &pv_entry_max); 719 pv_entry_max = roundup(pv_entry_max, _NPCPV); 720 pv_entry_high_water = 9 * (pv_entry_max / 10); 721 722 /* 723 * Are large page mappings enabled? 724 */ 725 TUNABLE_INT_FETCH("vm.pmap.pg_ps_enabled", &pg_ps_enabled); 726 727 /* 728 * Calculate the size of the pv head table for superpages. 729 */ 730 for (i = 0; phys_avail[i + 1]; i += 2); 731 pv_npg = round_4mpage(phys_avail[(i - 2) + 1]) / NBPDR; 732 733 /* 734 * Allocate memory for the pv head table for superpages. 735 */ 736 s = (vm_size_t)(pv_npg * sizeof(struct md_page)); 737 s = round_page(s); 738 pv_table = (struct md_page *)kmem_alloc(kernel_map, s); 739 for (i = 0; i < pv_npg; i++) 740 TAILQ_INIT(&pv_table[i].pv_list); 741 742 pv_maxchunks = MAX(pv_entry_max / _NPCPV, maxproc); 743 pv_chunkbase = (struct pv_chunk *)kmem_alloc_nofault(kernel_map, 744 PAGE_SIZE * pv_maxchunks); 745 if (pv_chunkbase == NULL) 746 panic("pmap_init: not enough kvm for pv chunks"); 747 pmap_ptelist_init(&pv_vafree, pv_chunkbase, pv_maxchunks); 748#if defined(PAE) && !defined(XEN) 749 pdptzone = uma_zcreate("PDPT", NPGPTD * sizeof(pdpt_entry_t), NULL, 750 NULL, NULL, NULL, (NPGPTD * sizeof(pdpt_entry_t)) - 1, 751 UMA_ZONE_VM | UMA_ZONE_NOFREE); 752 uma_zone_set_allocf(pdptzone, pmap_pdpt_allocf); 753#endif 754} 755 756 757/*************************************************** 758 * Low level helper routines..... 759 ***************************************************/ 760 761/* 762 * Determine the appropriate bits to set in a PTE or PDE for a specified 763 * caching mode. 764 */ 765int 766pmap_cache_bits(int mode, boolean_t is_pde) 767{ 768 int pat_flag, pat_index, cache_bits; 769 770 /* The PAT bit is different for PTE's and PDE's. */ 771 pat_flag = is_pde ? PG_PDE_PAT : PG_PTE_PAT; 772 773 /* If we don't support PAT, map extended modes to older ones. */ 774 if (!(cpu_feature & CPUID_PAT)) { 775 switch (mode) { 776 case PAT_UNCACHEABLE: 777 case PAT_WRITE_THROUGH: 778 case PAT_WRITE_BACK: 779 break; 780 case PAT_UNCACHED: 781 case PAT_WRITE_COMBINING: 782 case PAT_WRITE_PROTECTED: 783 mode = PAT_UNCACHEABLE; 784 break; 785 } 786 } 787 788 /* Map the caching mode to a PAT index. */ 789 if (pat_works) { 790 switch (mode) { 791 case PAT_UNCACHEABLE: 792 pat_index = 3; 793 break; 794 case PAT_WRITE_THROUGH: 795 pat_index = 1; 796 break; 797 case PAT_WRITE_BACK: 798 pat_index = 0; 799 break; 800 case PAT_UNCACHED: 801 pat_index = 2; 802 break; 803 case PAT_WRITE_COMBINING: 804 pat_index = 5; 805 break; 806 case PAT_WRITE_PROTECTED: 807 pat_index = 4; 808 break; 809 default: 810 panic("Unknown caching mode %d\n", mode); 811 } 812 } else { 813 switch (mode) { 814 case PAT_UNCACHED: 815 case PAT_UNCACHEABLE: 816 case PAT_WRITE_PROTECTED: 817 pat_index = 3; 818 break; 819 case PAT_WRITE_THROUGH: 820 pat_index = 1; 821 break; 822 case PAT_WRITE_BACK: 823 pat_index = 0; 824 break; 825 case PAT_WRITE_COMBINING: 826 pat_index = 2; 827 break; 828 default: 829 panic("Unknown caching mode %d\n", mode); 830 } 831 } 832 833 /* Map the 3-bit index value into the PAT, PCD, and PWT bits. */ 834 cache_bits = 0; 835 if (pat_index & 0x4) 836 cache_bits |= pat_flag; 837 if (pat_index & 0x2) 838 cache_bits |= PG_NC_PCD; 839 if (pat_index & 0x1) 840 cache_bits |= PG_NC_PWT; 841 return (cache_bits); 842} 843#ifdef SMP 844/* 845 * For SMP, these functions have to use the IPI mechanism for coherence. 846 * 847 * N.B.: Before calling any of the following TLB invalidation functions, 848 * the calling processor must ensure that all stores updating a non- 849 * kernel page table are globally performed. Otherwise, another 850 * processor could cache an old, pre-update entry without being 851 * invalidated. This can happen one of two ways: (1) The pmap becomes 852 * active on another processor after its pm_active field is checked by 853 * one of the following functions but before a store updating the page 854 * table is globally performed. (2) The pmap becomes active on another 855 * processor before its pm_active field is checked but due to 856 * speculative loads one of the following functions stills reads the 857 * pmap as inactive on the other processor. 858 * 859 * The kernel page table is exempt because its pm_active field is 860 * immutable. The kernel page table is always active on every 861 * processor. 862 */ 863void 864pmap_invalidate_page(pmap_t pmap, vm_offset_t va) 865{ 866 cpumask_t cpumask, other_cpus; 867 868 CTR2(KTR_PMAP, "pmap_invalidate_page: pmap=%p va=0x%x", 869 pmap, va); 870 871 sched_pin(); 872 if (pmap == kernel_pmap || pmap->pm_active == all_cpus) { 873 invlpg(va); 874 smp_invlpg(va); 875 } else { 876 cpumask = PCPU_GET(cpumask); 877 other_cpus = PCPU_GET(other_cpus); 878 if (pmap->pm_active & cpumask) 879 invlpg(va); 880 if (pmap->pm_active & other_cpus) 881 smp_masked_invlpg(pmap->pm_active & other_cpus, va); 882 } 883 sched_unpin(); 884 PT_UPDATES_FLUSH(); 885} 886 887void 888pmap_invalidate_range(pmap_t pmap, vm_offset_t sva, vm_offset_t eva) 889{ 890 cpumask_t cpumask, other_cpus; 891 vm_offset_t addr; 892 893 CTR3(KTR_PMAP, "pmap_invalidate_page: pmap=%p eva=0x%x sva=0x%x", 894 pmap, sva, eva); 895 896 sched_pin(); 897 if (pmap == kernel_pmap || pmap->pm_active == all_cpus) { 898 for (addr = sva; addr < eva; addr += PAGE_SIZE) 899 invlpg(addr); 900 smp_invlpg_range(sva, eva); 901 } else { 902 cpumask = PCPU_GET(cpumask); 903 other_cpus = PCPU_GET(other_cpus); 904 if (pmap->pm_active & cpumask) 905 for (addr = sva; addr < eva; addr += PAGE_SIZE) 906 invlpg(addr); 907 if (pmap->pm_active & other_cpus) 908 smp_masked_invlpg_range(pmap->pm_active & other_cpus, 909 sva, eva); 910 } 911 sched_unpin(); 912 PT_UPDATES_FLUSH(); 913} 914 915void 916pmap_invalidate_all(pmap_t pmap) 917{ 918 cpumask_t cpumask, other_cpus; 919 920 CTR1(KTR_PMAP, "pmap_invalidate_page: pmap=%p", pmap); 921 922 sched_pin(); 923 if (pmap == kernel_pmap || pmap->pm_active == all_cpus) { 924 invltlb(); 925 smp_invltlb(); 926 } else { 927 cpumask = PCPU_GET(cpumask); 928 other_cpus = PCPU_GET(other_cpus); 929 if (pmap->pm_active & cpumask) 930 invltlb(); 931 if (pmap->pm_active & other_cpus) 932 smp_masked_invltlb(pmap->pm_active & other_cpus); 933 } 934 sched_unpin(); 935} 936 937void 938pmap_invalidate_cache(void) 939{ 940 941 sched_pin(); 942 wbinvd(); 943 smp_cache_flush(); 944 sched_unpin(); 945} 946#else /* !SMP */ 947/* 948 * Normal, non-SMP, 486+ invalidation functions. 949 * We inline these within pmap.c for speed. 950 */ 951PMAP_INLINE void 952pmap_invalidate_page(pmap_t pmap, vm_offset_t va) 953{ 954 CTR2(KTR_PMAP, "pmap_invalidate_page: pmap=%p va=0x%x", 955 pmap, va); 956 957 if (pmap == kernel_pmap || pmap->pm_active) 958 invlpg(va); 959 PT_UPDATES_FLUSH(); 960} 961 962PMAP_INLINE void 963pmap_invalidate_range(pmap_t pmap, vm_offset_t sva, vm_offset_t eva) 964{ 965 vm_offset_t addr; 966 967 if (eva - sva > PAGE_SIZE) 968 CTR3(KTR_PMAP, "pmap_invalidate_range: pmap=%p sva=0x%x eva=0x%x", 969 pmap, sva, eva); 970 971 if (pmap == kernel_pmap || pmap->pm_active) 972 for (addr = sva; addr < eva; addr += PAGE_SIZE) 973 invlpg(addr); 974 PT_UPDATES_FLUSH(); 975} 976 977PMAP_INLINE void 978pmap_invalidate_all(pmap_t pmap) 979{ 980 981 CTR1(KTR_PMAP, "pmap_invalidate_all: pmap=%p", pmap); 982 983 if (pmap == kernel_pmap || pmap->pm_active) 984 invltlb(); 985} 986 987PMAP_INLINE void 988pmap_invalidate_cache(void) 989{ 990 991 wbinvd(); 992} 993#endif /* !SMP */ 994 995void 996pmap_invalidate_cache_range(vm_offset_t sva, vm_offset_t eva) 997{ 998 999 KASSERT((sva & PAGE_MASK) == 0, 1000 ("pmap_invalidate_cache_range: sva not page-aligned")); 1001 KASSERT((eva & PAGE_MASK) == 0, 1002 ("pmap_invalidate_cache_range: eva not page-aligned")); 1003 1004 if (cpu_feature & CPUID_SS) 1005 ; /* If "Self Snoop" is supported, do nothing. */ 1006 else if (cpu_feature & CPUID_CLFSH) { 1007 1008 /* 1009 * Otherwise, do per-cache line flush. Use the mfence 1010 * instruction to insure that previous stores are 1011 * included in the write-back. The processor 1012 * propagates flush to other processors in the cache 1013 * coherence domain. 1014 */ 1015 mfence(); 1016 for (; sva < eva; sva += cpu_clflush_line_size) 1017 clflush(sva); 1018 mfence(); 1019 } else { 1020 1021 /* 1022 * No targeted cache flush methods are supported by CPU, 1023 * globally invalidate cache as a last resort. 1024 */ 1025 pmap_invalidate_cache(); 1026 } 1027} 1028 1029/* 1030 * Are we current address space or kernel? N.B. We return FALSE when 1031 * a pmap's page table is in use because a kernel thread is borrowing 1032 * it. The borrowed page table can change spontaneously, making any 1033 * dependence on its continued use subject to a race condition. 1034 */ 1035static __inline int 1036pmap_is_current(pmap_t pmap) 1037{ 1038 1039 return (pmap == kernel_pmap || 1040 (pmap == vmspace_pmap(curthread->td_proc->p_vmspace) && 1041 (pmap->pm_pdir[PTDPTDI] & PG_FRAME) == (PTDpde[0] & PG_FRAME))); 1042} 1043 1044/* 1045 * If the given pmap is not the current or kernel pmap, the returned pte must 1046 * be released by passing it to pmap_pte_release(). 1047 */ 1048pt_entry_t * 1049pmap_pte(pmap_t pmap, vm_offset_t va) 1050{ 1051 pd_entry_t newpf; 1052 pd_entry_t *pde; 1053 1054 pde = pmap_pde(pmap, va); 1055 if (*pde & PG_PS) 1056 return (pde); 1057 if (*pde != 0) { 1058 /* are we current address space or kernel? */ 1059 if (pmap_is_current(pmap)) 1060 return (vtopte(va)); 1061 mtx_lock(&PMAP2mutex); 1062 newpf = *pde & PG_FRAME; 1063 if ((*PMAP2 & PG_FRAME) != newpf) { 1064 vm_page_lock_queues(); 1065 PT_SET_MA(PADDR2, newpf | PG_V | PG_A | PG_M); 1066 vm_page_unlock_queues(); 1067 CTR3(KTR_PMAP, "pmap_pte: pmap=%p va=0x%x newpte=0x%08x", 1068 pmap, va, (*PMAP2 & 0xffffffff)); 1069 } 1070 1071 return (PADDR2 + (i386_btop(va) & (NPTEPG - 1))); 1072 } 1073 return (0); 1074} 1075 1076/* 1077 * Releases a pte that was obtained from pmap_pte(). Be prepared for the pte 1078 * being NULL. 1079 */ 1080static __inline void 1081pmap_pte_release(pt_entry_t *pte) 1082{ 1083 1084 if ((pt_entry_t *)((vm_offset_t)pte & ~PAGE_MASK) == PADDR2) { 1085 CTR1(KTR_PMAP, "pmap_pte_release: pte=0x%jx", 1086 *PMAP2); 1087 PT_SET_VA(PMAP2, 0, TRUE); 1088 mtx_unlock(&PMAP2mutex); 1089 } 1090} 1091 1092static __inline void 1093invlcaddr(void *caddr) 1094{ 1095 1096 invlpg((u_int)caddr); 1097 PT_UPDATES_FLUSH(); 1098} 1099 1100/* 1101 * Super fast pmap_pte routine best used when scanning 1102 * the pv lists. This eliminates many coarse-grained 1103 * invltlb calls. Note that many of the pv list 1104 * scans are across different pmaps. It is very wasteful 1105 * to do an entire invltlb for checking a single mapping. 1106 * 1107 * If the given pmap is not the current pmap, vm_page_queue_mtx 1108 * must be held and curthread pinned to a CPU. 1109 */ 1110static pt_entry_t * 1111pmap_pte_quick(pmap_t pmap, vm_offset_t va) 1112{ 1113 pd_entry_t newpf; 1114 pd_entry_t *pde; 1115 1116 pde = pmap_pde(pmap, va); 1117 if (*pde & PG_PS) 1118 return (pde); 1119 if (*pde != 0) { 1120 /* are we current address space or kernel? */ 1121 if (pmap_is_current(pmap)) 1122 return (vtopte(va)); 1123 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 1124 KASSERT(curthread->td_pinned > 0, ("curthread not pinned")); 1125 newpf = *pde & PG_FRAME; 1126 if ((*PMAP1 & PG_FRAME) != newpf) { 1127 PT_SET_MA(PADDR1, newpf | PG_V | PG_A | PG_M); 1128 CTR3(KTR_PMAP, "pmap_pte_quick: pmap=%p va=0x%x newpte=0x%08x", 1129 pmap, va, (u_long)*PMAP1); 1130 1131#ifdef SMP 1132 PMAP1cpu = PCPU_GET(cpuid); 1133#endif 1134 PMAP1changed++; 1135 } else 1136#ifdef SMP 1137 if (PMAP1cpu != PCPU_GET(cpuid)) { 1138 PMAP1cpu = PCPU_GET(cpuid); 1139 invlcaddr(PADDR1); 1140 PMAP1changedcpu++; 1141 } else 1142#endif 1143 PMAP1unchanged++; 1144 return (PADDR1 + (i386_btop(va) & (NPTEPG - 1))); 1145 } 1146 return (0); 1147} 1148 1149/* 1150 * Routine: pmap_extract 1151 * Function: 1152 * Extract the physical page address associated 1153 * with the given map/virtual_address pair. 1154 */ 1155vm_paddr_t 1156pmap_extract(pmap_t pmap, vm_offset_t va) 1157{ 1158 vm_paddr_t rtval; 1159 pt_entry_t *pte; 1160 pd_entry_t pde; 1161 pt_entry_t pteval; 1162 1163 rtval = 0; 1164 PMAP_LOCK(pmap); 1165 pde = pmap->pm_pdir[va >> PDRSHIFT]; 1166 if (pde != 0) { 1167 if ((pde & PG_PS) != 0) { 1168 rtval = xpmap_mtop(pde & PG_PS_FRAME) | (va & PDRMASK); 1169 PMAP_UNLOCK(pmap); 1170 return rtval; 1171 } 1172 pte = pmap_pte(pmap, va); 1173 pteval = *pte ? xpmap_mtop(*pte) : 0; 1174 rtval = (pteval & PG_FRAME) | (va & PAGE_MASK); 1175 pmap_pte_release(pte); 1176 } 1177 PMAP_UNLOCK(pmap); 1178 return (rtval); 1179} 1180 1181/* 1182 * Routine: pmap_extract_ma 1183 * Function: 1184 * Like pmap_extract, but returns machine address 1185 */ 1186vm_paddr_t 1187pmap_extract_ma(pmap_t pmap, vm_offset_t va) 1188{ 1189 vm_paddr_t rtval; 1190 pt_entry_t *pte; 1191 pd_entry_t pde; 1192 1193 rtval = 0; 1194 PMAP_LOCK(pmap); 1195 pde = pmap->pm_pdir[va >> PDRSHIFT]; 1196 if (pde != 0) { 1197 if ((pde & PG_PS) != 0) { 1198 rtval = (pde & ~PDRMASK) | (va & PDRMASK); 1199 PMAP_UNLOCK(pmap); 1200 return rtval; 1201 } 1202 pte = pmap_pte(pmap, va); 1203 rtval = (*pte & PG_FRAME) | (va & PAGE_MASK); 1204 pmap_pte_release(pte); 1205 } 1206 PMAP_UNLOCK(pmap); 1207 return (rtval); 1208} 1209 1210/* 1211 * Routine: pmap_extract_and_hold 1212 * Function: 1213 * Atomically extract and hold the physical page 1214 * with the given pmap and virtual address pair 1215 * if that mapping permits the given protection. 1216 */ 1217vm_page_t 1218pmap_extract_and_hold(pmap_t pmap, vm_offset_t va, vm_prot_t prot) 1219{ 1220 pd_entry_t pde; 1221 pt_entry_t pte; 1222 vm_page_t m; 1223 vm_paddr_t pa; 1224 1225 pa = 0; 1226 m = NULL; 1227 PMAP_LOCK(pmap); 1228retry: 1229 pde = PT_GET(pmap_pde(pmap, va)); 1230 if (pde != 0) { 1231 if (pde & PG_PS) { 1232 if ((pde & PG_RW) || (prot & VM_PROT_WRITE) == 0) { 1233 if (vm_page_pa_tryrelock(pmap, (pde & PG_PS_FRAME) | 1234 (va & PDRMASK), &pa)) 1235 goto retry; 1236 m = PHYS_TO_VM_PAGE((pde & PG_PS_FRAME) | 1237 (va & PDRMASK)); 1238 vm_page_hold(m); 1239 } 1240 } else { 1241 sched_pin(); 1242 pte = PT_GET(pmap_pte_quick(pmap, va)); 1243 if (*PMAP1) 1244 PT_SET_MA(PADDR1, 0); 1245 if ((pte & PG_V) && 1246 ((pte & PG_RW) || (prot & VM_PROT_WRITE) == 0)) { 1247 if (vm_page_pa_tryrelock(pmap, pte & PG_FRAME, &pa)) 1248 goto retry; 1249 m = PHYS_TO_VM_PAGE(pte & PG_FRAME); 1250 vm_page_hold(m); 1251 } 1252 sched_unpin(); 1253 } 1254 } 1255 PA_UNLOCK_COND(pa); 1256 PMAP_UNLOCK(pmap); 1257 return (m); 1258} 1259 1260/*************************************************** 1261 * Low level mapping routines..... 1262 ***************************************************/ 1263 1264/* 1265 * Add a wired page to the kva. 1266 * Note: not SMP coherent. 1267 */ 1268void 1269pmap_kenter(vm_offset_t va, vm_paddr_t pa) 1270{ 1271 PT_SET_MA(va, xpmap_ptom(pa)| PG_RW | PG_V | pgeflag); 1272} 1273 1274void 1275pmap_kenter_ma(vm_offset_t va, vm_paddr_t ma) 1276{ 1277 pt_entry_t *pte; 1278 1279 pte = vtopte(va); 1280 pte_store_ma(pte, ma | PG_RW | PG_V | pgeflag); 1281} 1282 1283 1284static __inline void 1285pmap_kenter_attr(vm_offset_t va, vm_paddr_t pa, int mode) 1286{ 1287 PT_SET_MA(va, pa | PG_RW | PG_V | pgeflag | pmap_cache_bits(mode, 0)); 1288} 1289 1290/* 1291 * Remove a page from the kernel pagetables. 1292 * Note: not SMP coherent. 1293 */ 1294PMAP_INLINE void 1295pmap_kremove(vm_offset_t va) 1296{ 1297 pt_entry_t *pte; 1298 1299 pte = vtopte(va); 1300 PT_CLEAR_VA(pte, FALSE); 1301} 1302 1303/* 1304 * Used to map a range of physical addresses into kernel 1305 * virtual address space. 1306 * 1307 * The value passed in '*virt' is a suggested virtual address for 1308 * the mapping. Architectures which can support a direct-mapped 1309 * physical to virtual region can return the appropriate address 1310 * within that region, leaving '*virt' unchanged. Other 1311 * architectures should map the pages starting at '*virt' and 1312 * update '*virt' with the first usable address after the mapped 1313 * region. 1314 */ 1315vm_offset_t 1316pmap_map(vm_offset_t *virt, vm_paddr_t start, vm_paddr_t end, int prot) 1317{ 1318 vm_offset_t va, sva; 1319 1320 va = sva = *virt; 1321 CTR4(KTR_PMAP, "pmap_map: va=0x%x start=0x%jx end=0x%jx prot=0x%x", 1322 va, start, end, prot); 1323 while (start < end) { 1324 pmap_kenter(va, start); 1325 va += PAGE_SIZE; 1326 start += PAGE_SIZE; 1327 } 1328 pmap_invalidate_range(kernel_pmap, sva, va); 1329 *virt = va; 1330 return (sva); 1331} 1332 1333 1334/* 1335 * Add a list of wired pages to the kva 1336 * this routine is only used for temporary 1337 * kernel mappings that do not need to have 1338 * page modification or references recorded. 1339 * Note that old mappings are simply written 1340 * over. The page *must* be wired. 1341 * Note: SMP coherent. Uses a ranged shootdown IPI. 1342 */ 1343void 1344pmap_qenter(vm_offset_t sva, vm_page_t *ma, int count) 1345{ 1346 pt_entry_t *endpte, *pte; 1347 vm_paddr_t pa; 1348 vm_offset_t va = sva; 1349 int mclcount = 0; 1350 multicall_entry_t mcl[16]; 1351 multicall_entry_t *mclp = mcl; 1352 int error; 1353 1354 CTR2(KTR_PMAP, "pmap_qenter:sva=0x%x count=%d", va, count); 1355 pte = vtopte(sva); 1356 endpte = pte + count; 1357 while (pte < endpte) { 1358 pa = xpmap_ptom(VM_PAGE_TO_PHYS(*ma)) | pgeflag | PG_RW | PG_V | PG_M | PG_A; 1359 1360 mclp->op = __HYPERVISOR_update_va_mapping; 1361 mclp->args[0] = va; 1362 mclp->args[1] = (uint32_t)(pa & 0xffffffff); 1363 mclp->args[2] = (uint32_t)(pa >> 32); 1364 mclp->args[3] = (*pte & PG_V) ? UVMF_INVLPG|UVMF_ALL : 0; 1365 1366 va += PAGE_SIZE; 1367 pte++; 1368 ma++; 1369 mclp++; 1370 mclcount++; 1371 if (mclcount == 16) { 1372 error = HYPERVISOR_multicall(mcl, mclcount); 1373 mclp = mcl; 1374 mclcount = 0; 1375 KASSERT(error == 0, ("bad multicall %d", error)); 1376 } 1377 } 1378 if (mclcount) { 1379 error = HYPERVISOR_multicall(mcl, mclcount); 1380 KASSERT(error == 0, ("bad multicall %d", error)); 1381 } 1382 1383#ifdef INVARIANTS 1384 for (pte = vtopte(sva), mclcount = 0; mclcount < count; mclcount++, pte++) 1385 KASSERT(*pte, ("pte not set for va=0x%x", sva + mclcount*PAGE_SIZE)); 1386#endif 1387} 1388 1389 1390/* 1391 * This routine tears out page mappings from the 1392 * kernel -- it is meant only for temporary mappings. 1393 * Note: SMP coherent. Uses a ranged shootdown IPI. 1394 */ 1395void 1396pmap_qremove(vm_offset_t sva, int count) 1397{ 1398 vm_offset_t va; 1399 1400 CTR2(KTR_PMAP, "pmap_qremove: sva=0x%x count=%d", sva, count); 1401 va = sva; 1402 vm_page_lock_queues(); 1403 critical_enter(); 1404 while (count-- > 0) { 1405 pmap_kremove(va); 1406 va += PAGE_SIZE; 1407 } 1408 pmap_invalidate_range(kernel_pmap, sva, va); 1409 critical_exit(); 1410 vm_page_unlock_queues(); 1411} 1412 1413/*************************************************** 1414 * Page table page management routines..... 1415 ***************************************************/ 1416static __inline void 1417pmap_free_zero_pages(vm_page_t free) 1418{ 1419 vm_page_t m; 1420 1421 while (free != NULL) { 1422 m = free; 1423 free = m->right; 1424 vm_page_free_zero(m); 1425 } 1426} 1427 1428/* 1429 * This routine unholds page table pages, and if the hold count 1430 * drops to zero, then it decrements the wire count. 1431 */ 1432static __inline int 1433pmap_unwire_pte_hold(pmap_t pmap, vm_page_t m, vm_page_t *free) 1434{ 1435 1436 --m->wire_count; 1437 if (m->wire_count == 0) 1438 return _pmap_unwire_pte_hold(pmap, m, free); 1439 else 1440 return 0; 1441} 1442 1443static int 1444_pmap_unwire_pte_hold(pmap_t pmap, vm_page_t m, vm_page_t *free) 1445{ 1446 vm_offset_t pteva; 1447 1448 PT_UPDATES_FLUSH(); 1449 /* 1450 * unmap the page table page 1451 */ 1452 xen_pt_unpin(pmap->pm_pdir[m->pindex]); 1453 /* 1454 * page *might* contain residual mapping :-/ 1455 */ 1456 PD_CLEAR_VA(pmap, m->pindex, TRUE); 1457 pmap_zero_page(m); 1458 --pmap->pm_stats.resident_count; 1459 1460 /* 1461 * This is a release store so that the ordinary store unmapping 1462 * the page table page is globally performed before TLB shoot- 1463 * down is begun. 1464 */ 1465 atomic_subtract_rel_int(&cnt.v_wire_count, 1); 1466 1467 /* 1468 * Do an invltlb to make the invalidated mapping 1469 * take effect immediately. 1470 */ 1471 pteva = VM_MAXUSER_ADDRESS + i386_ptob(m->pindex); 1472 pmap_invalidate_page(pmap, pteva); 1473 1474 /* 1475 * Put page on a list so that it is released after 1476 * *ALL* TLB shootdown is done 1477 */ 1478 m->right = *free; 1479 *free = m; 1480 1481 return 1; 1482} 1483 1484/* 1485 * After removing a page table entry, this routine is used to 1486 * conditionally free the page, and manage the hold/wire counts. 1487 */ 1488static int 1489pmap_unuse_pt(pmap_t pmap, vm_offset_t va, vm_page_t *free) 1490{ 1491 pd_entry_t ptepde; 1492 vm_page_t mpte; 1493 1494 if (va >= VM_MAXUSER_ADDRESS) 1495 return 0; 1496 ptepde = PT_GET(pmap_pde(pmap, va)); 1497 mpte = PHYS_TO_VM_PAGE(ptepde & PG_FRAME); 1498 return pmap_unwire_pte_hold(pmap, mpte, free); 1499} 1500 1501void 1502pmap_pinit0(pmap_t pmap) 1503{ 1504 1505 PMAP_LOCK_INIT(pmap); 1506 pmap->pm_pdir = (pd_entry_t *)(KERNBASE + (vm_offset_t)IdlePTD); 1507#ifdef PAE 1508 pmap->pm_pdpt = (pdpt_entry_t *)(KERNBASE + (vm_offset_t)IdlePDPT); 1509#endif 1510 pmap->pm_active = 0; 1511 PCPU_SET(curpmap, pmap); 1512 TAILQ_INIT(&pmap->pm_pvchunk); 1513 bzero(&pmap->pm_stats, sizeof pmap->pm_stats); 1514 mtx_lock_spin(&allpmaps_lock); 1515 LIST_INSERT_HEAD(&allpmaps, pmap, pm_list); 1516 mtx_unlock_spin(&allpmaps_lock); 1517} 1518 1519/* 1520 * Initialize a preallocated and zeroed pmap structure, 1521 * such as one in a vmspace structure. 1522 */ 1523int 1524pmap_pinit(pmap_t pmap) 1525{ 1526 vm_page_t m, ptdpg[NPGPTD + 1]; 1527 int npgptd = NPGPTD + 1; 1528 static int color; 1529 int i; 1530 1531 PMAP_LOCK_INIT(pmap); 1532 1533 /* 1534 * No need to allocate page table space yet but we do need a valid 1535 * page directory table. 1536 */ 1537 if (pmap->pm_pdir == NULL) { 1538 pmap->pm_pdir = (pd_entry_t *)kmem_alloc_nofault(kernel_map, 1539 NBPTD); 1540 if (pmap->pm_pdir == NULL) { 1541 PMAP_LOCK_DESTROY(pmap); 1542 return (0); 1543 } 1544#if defined(XEN) && defined(PAE) 1545 pmap->pm_pdpt = (pd_entry_t *)kmem_alloc_nofault(kernel_map, 1); 1546#endif 1547 1548#if defined(PAE) && !defined(XEN) 1549 pmap->pm_pdpt = uma_zalloc(pdptzone, M_WAITOK | M_ZERO); 1550 KASSERT(((vm_offset_t)pmap->pm_pdpt & 1551 ((NPGPTD * sizeof(pdpt_entry_t)) - 1)) == 0, 1552 ("pmap_pinit: pdpt misaligned")); 1553 KASSERT(pmap_kextract((vm_offset_t)pmap->pm_pdpt) < (4ULL<<30), 1554 ("pmap_pinit: pdpt above 4g")); 1555#endif 1556 } 1557 1558 /* 1559 * allocate the page directory page(s) 1560 */ 1561 for (i = 0; i < npgptd;) { 1562 m = vm_page_alloc(NULL, color++, 1563 VM_ALLOC_NORMAL | VM_ALLOC_NOOBJ | VM_ALLOC_WIRED | 1564 VM_ALLOC_ZERO); 1565 if (m == NULL) 1566 VM_WAIT; 1567 else { 1568 ptdpg[i++] = m; 1569 } 1570 } 1571 pmap_qenter((vm_offset_t)pmap->pm_pdir, ptdpg, NPGPTD); 1572 for (i = 0; i < NPGPTD; i++) { 1573 if ((ptdpg[i]->flags & PG_ZERO) == 0) 1574 pagezero(&pmap->pm_pdir[i*NPTEPG]); 1575 } 1576 1577 mtx_lock_spin(&allpmaps_lock); 1578 LIST_INSERT_HEAD(&allpmaps, pmap, pm_list); 1579 mtx_unlock_spin(&allpmaps_lock); 1580 /* Wire in kernel global address entries. */ 1581 1582 bcopy(PTD + KPTDI, pmap->pm_pdir + KPTDI, nkpt * sizeof(pd_entry_t)); 1583#ifdef PAE 1584#ifdef XEN 1585 pmap_qenter((vm_offset_t)pmap->pm_pdpt, &ptdpg[NPGPTD], 1); 1586 if ((ptdpg[NPGPTD]->flags & PG_ZERO) == 0) 1587 bzero(pmap->pm_pdpt, PAGE_SIZE); 1588#endif 1589 for (i = 0; i < NPGPTD; i++) { 1590 vm_paddr_t ma; 1591 1592 ma = xpmap_ptom(VM_PAGE_TO_PHYS(ptdpg[i])); 1593 pmap->pm_pdpt[i] = ma | PG_V; 1594 1595 } 1596#endif 1597#ifdef XEN 1598 for (i = 0; i < NPGPTD; i++) { 1599 pt_entry_t *pd; 1600 vm_paddr_t ma; 1601 1602 ma = xpmap_ptom(VM_PAGE_TO_PHYS(ptdpg[i])); 1603 pd = pmap->pm_pdir + (i * NPDEPG); 1604 PT_SET_MA(pd, *vtopte((vm_offset_t)pd) & ~(PG_M|PG_A|PG_U|PG_RW)); 1605#if 0 1606 xen_pgd_pin(ma); 1607#endif 1608 } 1609 1610#ifdef PAE 1611 PT_SET_MA(pmap->pm_pdpt, *vtopte((vm_offset_t)pmap->pm_pdpt) & ~PG_RW); 1612#endif 1613 vm_page_lock_queues(); 1614 xen_flush_queue(); 1615 xen_pgdpt_pin(xpmap_ptom(VM_PAGE_TO_PHYS(ptdpg[NPGPTD]))); 1616 for (i = 0; i < NPGPTD; i++) { 1617 vm_paddr_t ma = xpmap_ptom(VM_PAGE_TO_PHYS(ptdpg[i])); 1618 PT_SET_VA_MA(&pmap->pm_pdir[PTDPTDI + i], ma | PG_V | PG_A, FALSE); 1619 } 1620 xen_flush_queue(); 1621 vm_page_unlock_queues(); 1622#endif 1623 pmap->pm_active = 0; 1624 TAILQ_INIT(&pmap->pm_pvchunk); 1625 bzero(&pmap->pm_stats, sizeof pmap->pm_stats); 1626 1627 return (1); 1628} 1629 1630/* 1631 * this routine is called if the page table page is not 1632 * mapped correctly. 1633 */ 1634static vm_page_t 1635_pmap_allocpte(pmap_t pmap, unsigned int ptepindex, int flags) 1636{ 1637 vm_paddr_t ptema; 1638 vm_page_t m; 1639 1640 KASSERT((flags & (M_NOWAIT | M_WAITOK)) == M_NOWAIT || 1641 (flags & (M_NOWAIT | M_WAITOK)) == M_WAITOK, 1642 ("_pmap_allocpte: flags is neither M_NOWAIT nor M_WAITOK")); 1643 1644 /* 1645 * Allocate a page table page. 1646 */ 1647 if ((m = vm_page_alloc(NULL, ptepindex, VM_ALLOC_NOOBJ | 1648 VM_ALLOC_WIRED | VM_ALLOC_ZERO)) == NULL) { 1649 if (flags & M_WAITOK) { 1650 PMAP_UNLOCK(pmap); 1651 vm_page_unlock_queues(); 1652 VM_WAIT; 1653 vm_page_lock_queues(); 1654 PMAP_LOCK(pmap); 1655 } 1656 1657 /* 1658 * Indicate the need to retry. While waiting, the page table 1659 * page may have been allocated. 1660 */ 1661 return (NULL); 1662 } 1663 if ((m->flags & PG_ZERO) == 0) 1664 pmap_zero_page(m); 1665 1666 /* 1667 * Map the pagetable page into the process address space, if 1668 * it isn't already there. 1669 */ 1670 pmap->pm_stats.resident_count++; 1671 1672 ptema = xpmap_ptom(VM_PAGE_TO_PHYS(m)); 1673 xen_pt_pin(ptema); 1674 PT_SET_VA_MA(&pmap->pm_pdir[ptepindex], 1675 (ptema | PG_U | PG_RW | PG_V | PG_A | PG_M), TRUE); 1676 1677 KASSERT(pmap->pm_pdir[ptepindex], 1678 ("_pmap_allocpte: ptepindex=%d did not get mapped", ptepindex)); 1679 return (m); 1680} 1681 1682static vm_page_t 1683pmap_allocpte(pmap_t pmap, vm_offset_t va, int flags) 1684{ 1685 unsigned ptepindex; 1686 pd_entry_t ptema; 1687 vm_page_t m; 1688 1689 KASSERT((flags & (M_NOWAIT | M_WAITOK)) == M_NOWAIT || 1690 (flags & (M_NOWAIT | M_WAITOK)) == M_WAITOK, 1691 ("pmap_allocpte: flags is neither M_NOWAIT nor M_WAITOK")); 1692 1693 /* 1694 * Calculate pagetable page index 1695 */ 1696 ptepindex = va >> PDRSHIFT; 1697retry: 1698 /* 1699 * Get the page directory entry 1700 */ 1701 ptema = pmap->pm_pdir[ptepindex]; 1702 1703 /* 1704 * This supports switching from a 4MB page to a 1705 * normal 4K page. 1706 */ 1707 if (ptema & PG_PS) { 1708 /* 1709 * XXX 1710 */ 1711 pmap->pm_pdir[ptepindex] = 0; 1712 ptema = 0; 1713 pmap->pm_stats.resident_count -= NBPDR / PAGE_SIZE; 1714 pmap_invalidate_all(kernel_pmap); 1715 } 1716 1717 /* 1718 * If the page table page is mapped, we just increment the 1719 * hold count, and activate it. 1720 */ 1721 if (ptema & PG_V) { 1722 m = PHYS_TO_VM_PAGE(xpmap_mtop(ptema) & PG_FRAME); 1723 m->wire_count++; 1724 } else { 1725 /* 1726 * Here if the pte page isn't mapped, or if it has 1727 * been deallocated. 1728 */ 1729 CTR3(KTR_PMAP, "pmap_allocpte: pmap=%p va=0x%08x flags=0x%x", 1730 pmap, va, flags); 1731 m = _pmap_allocpte(pmap, ptepindex, flags); 1732 if (m == NULL && (flags & M_WAITOK)) 1733 goto retry; 1734 1735 KASSERT(pmap->pm_pdir[ptepindex], ("ptepindex=%d did not get mapped", ptepindex)); 1736 } 1737 return (m); 1738} 1739 1740 1741/*************************************************** 1742* Pmap allocation/deallocation routines. 1743 ***************************************************/ 1744 1745#ifdef SMP 1746/* 1747 * Deal with a SMP shootdown of other users of the pmap that we are 1748 * trying to dispose of. This can be a bit hairy. 1749 */ 1750static cpumask_t *lazymask; 1751static u_int lazyptd; 1752static volatile u_int lazywait; 1753 1754void pmap_lazyfix_action(void); 1755 1756void 1757pmap_lazyfix_action(void) 1758{ 1759 cpumask_t mymask = PCPU_GET(cpumask); 1760 1761#ifdef COUNT_IPIS 1762 (*ipi_lazypmap_counts[PCPU_GET(cpuid)])++; 1763#endif 1764 if (rcr3() == lazyptd) 1765 load_cr3(PCPU_GET(curpcb)->pcb_cr3); 1766 atomic_clear_int(lazymask, mymask); 1767 atomic_store_rel_int(&lazywait, 1); 1768} 1769 1770static void 1771pmap_lazyfix_self(cpumask_t mymask) 1772{ 1773 1774 if (rcr3() == lazyptd) 1775 load_cr3(PCPU_GET(curpcb)->pcb_cr3); 1776 atomic_clear_int(lazymask, mymask); 1777} 1778 1779 1780static void 1781pmap_lazyfix(pmap_t pmap) 1782{ 1783 cpumask_t mymask, mask; 1784 u_int spins; 1785 1786 while ((mask = pmap->pm_active) != 0) { 1787 spins = 50000000; 1788 mask = mask & -mask; /* Find least significant set bit */ 1789 mtx_lock_spin(&smp_ipi_mtx); 1790#ifdef PAE 1791 lazyptd = vtophys(pmap->pm_pdpt); 1792#else 1793 lazyptd = vtophys(pmap->pm_pdir); 1794#endif 1795 mymask = PCPU_GET(cpumask); 1796 if (mask == mymask) { 1797 lazymask = &pmap->pm_active; 1798 pmap_lazyfix_self(mymask); 1799 } else { 1800 atomic_store_rel_int((u_int *)&lazymask, 1801 (u_int)&pmap->pm_active); 1802 atomic_store_rel_int(&lazywait, 0); 1803 ipi_selected(mask, IPI_LAZYPMAP); 1804 while (lazywait == 0) { 1805 ia32_pause(); 1806 if (--spins == 0) 1807 break; 1808 } 1809 } 1810 mtx_unlock_spin(&smp_ipi_mtx); 1811 if (spins == 0) 1812 printf("pmap_lazyfix: spun for 50000000\n"); 1813 } 1814} 1815 1816#else /* SMP */ 1817 1818/* 1819 * Cleaning up on uniprocessor is easy. For various reasons, we're 1820 * unlikely to have to even execute this code, including the fact 1821 * that the cleanup is deferred until the parent does a wait(2), which 1822 * means that another userland process has run. 1823 */ 1824static void 1825pmap_lazyfix(pmap_t pmap) 1826{ 1827 u_int cr3; 1828 1829 cr3 = vtophys(pmap->pm_pdir); 1830 if (cr3 == rcr3()) { 1831 load_cr3(PCPU_GET(curpcb)->pcb_cr3); 1832 pmap->pm_active &= ~(PCPU_GET(cpumask)); 1833 } 1834} 1835#endif /* SMP */ 1836 1837/* 1838 * Release any resources held by the given physical map. 1839 * Called when a pmap initialized by pmap_pinit is being released. 1840 * Should only be called if the map contains no valid mappings. 1841 */ 1842void 1843pmap_release(pmap_t pmap) 1844{ 1845 vm_page_t m, ptdpg[2*NPGPTD+1]; 1846 vm_paddr_t ma; 1847 int i; 1848#ifdef XEN 1849#ifdef PAE 1850 int npgptd = NPGPTD + 1; 1851#else 1852 int npgptd = NPGPTD; 1853#endif 1854#else 1855 int npgptd = NPGPTD; 1856#endif 1857 KASSERT(pmap->pm_stats.resident_count == 0, 1858 ("pmap_release: pmap resident count %ld != 0", 1859 pmap->pm_stats.resident_count)); 1860 PT_UPDATES_FLUSH(); 1861 1862 pmap_lazyfix(pmap); 1863 mtx_lock_spin(&allpmaps_lock); 1864 LIST_REMOVE(pmap, pm_list); 1865 mtx_unlock_spin(&allpmaps_lock); 1866 1867 for (i = 0; i < NPGPTD; i++) 1868 ptdpg[i] = PHYS_TO_VM_PAGE(vtophys(pmap->pm_pdir + (i*NPDEPG)) & PG_FRAME); 1869 pmap_qremove((vm_offset_t)pmap->pm_pdir, NPGPTD); 1870#if defined(PAE) && defined(XEN) 1871 ptdpg[NPGPTD] = PHYS_TO_VM_PAGE(vtophys(pmap->pm_pdpt)); 1872#endif 1873 1874 for (i = 0; i < npgptd; i++) { 1875 m = ptdpg[i]; 1876 ma = xpmap_ptom(VM_PAGE_TO_PHYS(m)); 1877 /* unpinning L1 and L2 treated the same */ 1878 xen_pgd_unpin(ma); 1879#ifdef PAE 1880 if (i < NPGPTD) 1881 KASSERT(xpmap_ptom(VM_PAGE_TO_PHYS(m)) == (pmap->pm_pdpt[i] & PG_FRAME), 1882 ("pmap_release: got wrong ptd page")); 1883#endif 1884 m->wire_count--; 1885 atomic_subtract_int(&cnt.v_wire_count, 1); 1886 vm_page_free(m); 1887 } 1888 PMAP_LOCK_DESTROY(pmap); 1889} 1890 1891static int 1892kvm_size(SYSCTL_HANDLER_ARGS) 1893{ 1894 unsigned long ksize = VM_MAX_KERNEL_ADDRESS - KERNBASE; 1895 1896 return sysctl_handle_long(oidp, &ksize, 0, req); 1897} 1898SYSCTL_PROC(_vm, OID_AUTO, kvm_size, CTLTYPE_LONG|CTLFLAG_RD, 1899 0, 0, kvm_size, "IU", "Size of KVM"); 1900 1901static int 1902kvm_free(SYSCTL_HANDLER_ARGS) 1903{ 1904 unsigned long kfree = VM_MAX_KERNEL_ADDRESS - kernel_vm_end; 1905 1906 return sysctl_handle_long(oidp, &kfree, 0, req); 1907} 1908SYSCTL_PROC(_vm, OID_AUTO, kvm_free, CTLTYPE_LONG|CTLFLAG_RD, 1909 0, 0, kvm_free, "IU", "Amount of KVM free"); 1910 1911/* 1912 * grow the number of kernel page table entries, if needed 1913 */ 1914void 1915pmap_growkernel(vm_offset_t addr) 1916{ 1917 struct pmap *pmap; 1918 vm_paddr_t ptppaddr; 1919 vm_page_t nkpg; 1920 pd_entry_t newpdir; 1921 1922 mtx_assert(&kernel_map->system_mtx, MA_OWNED); 1923 if (kernel_vm_end == 0) { 1924 kernel_vm_end = KERNBASE; 1925 nkpt = 0; 1926 while (pdir_pde(PTD, kernel_vm_end)) { 1927 kernel_vm_end = (kernel_vm_end + PAGE_SIZE * NPTEPG) & ~(PAGE_SIZE * NPTEPG - 1); 1928 nkpt++; 1929 if (kernel_vm_end - 1 >= kernel_map->max_offset) { 1930 kernel_vm_end = kernel_map->max_offset; 1931 break; 1932 } 1933 } 1934 } 1935 addr = roundup2(addr, PAGE_SIZE * NPTEPG); 1936 if (addr - 1 >= kernel_map->max_offset) 1937 addr = kernel_map->max_offset; 1938 while (kernel_vm_end < addr) { 1939 if (pdir_pde(PTD, kernel_vm_end)) { 1940 kernel_vm_end = (kernel_vm_end + PAGE_SIZE * NPTEPG) & ~(PAGE_SIZE * NPTEPG - 1); 1941 if (kernel_vm_end - 1 >= kernel_map->max_offset) { 1942 kernel_vm_end = kernel_map->max_offset; 1943 break; 1944 } 1945 continue; 1946 } 1947 1948 /* 1949 * This index is bogus, but out of the way 1950 */ 1951 nkpg = vm_page_alloc(NULL, nkpt, 1952 VM_ALLOC_NOOBJ | VM_ALLOC_SYSTEM | VM_ALLOC_WIRED); 1953 if (!nkpg) 1954 panic("pmap_growkernel: no memory to grow kernel"); 1955 1956 nkpt++; 1957 1958 pmap_zero_page(nkpg); 1959 ptppaddr = VM_PAGE_TO_PHYS(nkpg); 1960 newpdir = (pd_entry_t) (ptppaddr | PG_V | PG_RW | PG_A | PG_M); 1961 vm_page_lock_queues(); 1962 PD_SET_VA(kernel_pmap, (kernel_vm_end >> PDRSHIFT), newpdir, TRUE); 1963 mtx_lock_spin(&allpmaps_lock); 1964 LIST_FOREACH(pmap, &allpmaps, pm_list) 1965 PD_SET_VA(pmap, (kernel_vm_end >> PDRSHIFT), newpdir, TRUE); 1966 1967 mtx_unlock_spin(&allpmaps_lock); 1968 vm_page_unlock_queues(); 1969 1970 kernel_vm_end = (kernel_vm_end + PAGE_SIZE * NPTEPG) & ~(PAGE_SIZE * NPTEPG - 1); 1971 if (kernel_vm_end - 1 >= kernel_map->max_offset) { 1972 kernel_vm_end = kernel_map->max_offset; 1973 break; 1974 } 1975 } 1976} 1977 1978 1979/*************************************************** 1980 * page management routines. 1981 ***************************************************/ 1982 1983CTASSERT(sizeof(struct pv_chunk) == PAGE_SIZE); 1984CTASSERT(_NPCM == 11); 1985 1986static __inline struct pv_chunk * 1987pv_to_chunk(pv_entry_t pv) 1988{ 1989 1990 return (struct pv_chunk *)((uintptr_t)pv & ~(uintptr_t)PAGE_MASK); 1991} 1992 1993#define PV_PMAP(pv) (pv_to_chunk(pv)->pc_pmap) 1994 1995#define PC_FREE0_9 0xfffffffful /* Free values for index 0 through 9 */ 1996#define PC_FREE10 0x0000fffful /* Free values for index 10 */ 1997 1998static uint32_t pc_freemask[11] = { 1999 PC_FREE0_9, PC_FREE0_9, PC_FREE0_9, 2000 PC_FREE0_9, PC_FREE0_9, PC_FREE0_9, 2001 PC_FREE0_9, PC_FREE0_9, PC_FREE0_9, 2002 PC_FREE0_9, PC_FREE10 2003}; 2004 2005SYSCTL_INT(_vm_pmap, OID_AUTO, pv_entry_count, CTLFLAG_RD, &pv_entry_count, 0, 2006 "Current number of pv entries"); 2007 2008#ifdef PV_STATS 2009static int pc_chunk_count, pc_chunk_allocs, pc_chunk_frees, pc_chunk_tryfail; 2010 2011SYSCTL_INT(_vm_pmap, OID_AUTO, pc_chunk_count, CTLFLAG_RD, &pc_chunk_count, 0, 2012 "Current number of pv entry chunks"); 2013SYSCTL_INT(_vm_pmap, OID_AUTO, pc_chunk_allocs, CTLFLAG_RD, &pc_chunk_allocs, 0, 2014 "Current number of pv entry chunks allocated"); 2015SYSCTL_INT(_vm_pmap, OID_AUTO, pc_chunk_frees, CTLFLAG_RD, &pc_chunk_frees, 0, 2016 "Current number of pv entry chunks frees"); 2017SYSCTL_INT(_vm_pmap, OID_AUTO, pc_chunk_tryfail, CTLFLAG_RD, &pc_chunk_tryfail, 0, 2018 "Number of times tried to get a chunk page but failed."); 2019 2020static long pv_entry_frees, pv_entry_allocs; 2021static int pv_entry_spare; 2022 2023SYSCTL_LONG(_vm_pmap, OID_AUTO, pv_entry_frees, CTLFLAG_RD, &pv_entry_frees, 0, 2024 "Current number of pv entry frees"); 2025SYSCTL_LONG(_vm_pmap, OID_AUTO, pv_entry_allocs, CTLFLAG_RD, &pv_entry_allocs, 0, 2026 "Current number of pv entry allocs"); 2027SYSCTL_INT(_vm_pmap, OID_AUTO, pv_entry_spare, CTLFLAG_RD, &pv_entry_spare, 0, 2028 "Current number of spare pv entries"); 2029 2030static int pmap_collect_inactive, pmap_collect_active; 2031 2032SYSCTL_INT(_vm_pmap, OID_AUTO, pmap_collect_inactive, CTLFLAG_RD, &pmap_collect_inactive, 0, 2033 "Current number times pmap_collect called on inactive queue"); 2034SYSCTL_INT(_vm_pmap, OID_AUTO, pmap_collect_active, CTLFLAG_RD, &pmap_collect_active, 0, 2035 "Current number times pmap_collect called on active queue"); 2036#endif 2037 2038/* 2039 * We are in a serious low memory condition. Resort to 2040 * drastic measures to free some pages so we can allocate 2041 * another pv entry chunk. This is normally called to 2042 * unmap inactive pages, and if necessary, active pages. 2043 */ 2044static void 2045pmap_collect(pmap_t locked_pmap, struct vpgqueues *vpq) 2046{ 2047 pmap_t pmap; 2048 pt_entry_t *pte, tpte; 2049 pv_entry_t next_pv, pv; 2050 vm_offset_t va; 2051 vm_page_t m, free; 2052 2053 sched_pin(); 2054 TAILQ_FOREACH(m, &vpq->pl, pageq) { 2055 if (m->hold_count || m->busy) 2056 continue; 2057 TAILQ_FOREACH_SAFE(pv, &m->md.pv_list, pv_list, next_pv) { 2058 va = pv->pv_va; 2059 pmap = PV_PMAP(pv); 2060 /* Avoid deadlock and lock recursion. */ 2061 if (pmap > locked_pmap) 2062 PMAP_LOCK(pmap); 2063 else if (pmap != locked_pmap && !PMAP_TRYLOCK(pmap)) 2064 continue; 2065 pmap->pm_stats.resident_count--; 2066 pte = pmap_pte_quick(pmap, va); 2067 tpte = pte_load_clear(pte); 2068 KASSERT((tpte & PG_W) == 0, 2069 ("pmap_collect: wired pte %#jx", (uintmax_t)tpte)); 2070 if (tpte & PG_A) 2071 vm_page_flag_set(m, PG_REFERENCED); 2072 if ((tpte & (PG_M | PG_RW)) == (PG_M | PG_RW)) 2073 vm_page_dirty(m); 2074 free = NULL; 2075 pmap_unuse_pt(pmap, va, &free); 2076 pmap_invalidate_page(pmap, va); 2077 pmap_free_zero_pages(free); 2078 TAILQ_REMOVE(&m->md.pv_list, pv, pv_list); 2079 free_pv_entry(pmap, pv); 2080 if (pmap != locked_pmap) 2081 PMAP_UNLOCK(pmap); 2082 } 2083 if (TAILQ_EMPTY(&m->md.pv_list)) 2084 vm_page_flag_clear(m, PG_WRITEABLE); 2085 } 2086 sched_unpin(); 2087} 2088 2089 2090/* 2091 * free the pv_entry back to the free list 2092 */ 2093static void 2094free_pv_entry(pmap_t pmap, pv_entry_t pv) 2095{ 2096 vm_page_t m; 2097 struct pv_chunk *pc; 2098 int idx, field, bit; 2099 2100 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 2101 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 2102 PV_STAT(pv_entry_frees++); 2103 PV_STAT(pv_entry_spare++); 2104 pv_entry_count--; 2105 pc = pv_to_chunk(pv); 2106 idx = pv - &pc->pc_pventry[0]; 2107 field = idx / 32; 2108 bit = idx % 32; 2109 pc->pc_map[field] |= 1ul << bit; 2110 /* move to head of list */ 2111 TAILQ_REMOVE(&pmap->pm_pvchunk, pc, pc_list); 2112 TAILQ_INSERT_HEAD(&pmap->pm_pvchunk, pc, pc_list); 2113 for (idx = 0; idx < _NPCM; idx++) 2114 if (pc->pc_map[idx] != pc_freemask[idx]) 2115 return; 2116 PV_STAT(pv_entry_spare -= _NPCPV); 2117 PV_STAT(pc_chunk_count--); 2118 PV_STAT(pc_chunk_frees++); 2119 /* entire chunk is free, return it */ 2120 TAILQ_REMOVE(&pmap->pm_pvchunk, pc, pc_list); 2121 m = PHYS_TO_VM_PAGE(pmap_kextract((vm_offset_t)pc)); 2122 pmap_qremove((vm_offset_t)pc, 1); 2123 vm_page_unwire(m, 0); 2124 vm_page_free(m); 2125 pmap_ptelist_free(&pv_vafree, (vm_offset_t)pc); 2126} 2127 2128/* 2129 * get a new pv_entry, allocating a block from the system 2130 * when needed. 2131 */ 2132static pv_entry_t 2133get_pv_entry(pmap_t pmap, int try) 2134{ 2135 static const struct timeval printinterval = { 60, 0 }; 2136 static struct timeval lastprint; 2137 static vm_pindex_t colour; 2138 struct vpgqueues *pq; 2139 int bit, field; 2140 pv_entry_t pv; 2141 struct pv_chunk *pc; 2142 vm_page_t m; 2143 2144 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 2145 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 2146 PV_STAT(pv_entry_allocs++); 2147 pv_entry_count++; 2148 if (pv_entry_count > pv_entry_high_water) 2149 if (ratecheck(&lastprint, &printinterval)) 2150 printf("Approaching the limit on PV entries, consider " 2151 "increasing either the vm.pmap.shpgperproc or the " 2152 "vm.pmap.pv_entry_max tunable.\n"); 2153 pq = NULL; 2154retry: 2155 pc = TAILQ_FIRST(&pmap->pm_pvchunk); 2156 if (pc != NULL) { 2157 for (field = 0; field < _NPCM; field++) { 2158 if (pc->pc_map[field]) { 2159 bit = bsfl(pc->pc_map[field]); 2160 break; 2161 } 2162 } 2163 if (field < _NPCM) { 2164 pv = &pc->pc_pventry[field * 32 + bit]; 2165 pc->pc_map[field] &= ~(1ul << bit); 2166 /* If this was the last item, move it to tail */ 2167 for (field = 0; field < _NPCM; field++) 2168 if (pc->pc_map[field] != 0) { 2169 PV_STAT(pv_entry_spare--); 2170 return (pv); /* not full, return */ 2171 } 2172 TAILQ_REMOVE(&pmap->pm_pvchunk, pc, pc_list); 2173 TAILQ_INSERT_TAIL(&pmap->pm_pvchunk, pc, pc_list); 2174 PV_STAT(pv_entry_spare--); 2175 return (pv); 2176 } 2177 } 2178 /* 2179 * Access to the ptelist "pv_vafree" is synchronized by the page 2180 * queues lock. If "pv_vafree" is currently non-empty, it will 2181 * remain non-empty until pmap_ptelist_alloc() completes. 2182 */ 2183 if (pv_vafree == 0 || (m = vm_page_alloc(NULL, colour, (pq == 2184 &vm_page_queues[PQ_ACTIVE] ? VM_ALLOC_SYSTEM : VM_ALLOC_NORMAL) | 2185 VM_ALLOC_NOOBJ | VM_ALLOC_WIRED)) == NULL) { 2186 if (try) { 2187 pv_entry_count--; 2188 PV_STAT(pc_chunk_tryfail++); 2189 return (NULL); 2190 } 2191 /* 2192 * Reclaim pv entries: At first, destroy mappings to 2193 * inactive pages. After that, if a pv chunk entry 2194 * is still needed, destroy mappings to active pages. 2195 */ 2196 if (pq == NULL) { 2197 PV_STAT(pmap_collect_inactive++); 2198 pq = &vm_page_queues[PQ_INACTIVE]; 2199 } else if (pq == &vm_page_queues[PQ_INACTIVE]) { 2200 PV_STAT(pmap_collect_active++); 2201 pq = &vm_page_queues[PQ_ACTIVE]; 2202 } else 2203 panic("get_pv_entry: increase vm.pmap.shpgperproc"); 2204 pmap_collect(pmap, pq); 2205 goto retry; 2206 } 2207 PV_STAT(pc_chunk_count++); 2208 PV_STAT(pc_chunk_allocs++); 2209 colour++; 2210 pc = (struct pv_chunk *)pmap_ptelist_alloc(&pv_vafree); 2211 pmap_qenter((vm_offset_t)pc, &m, 1); 2212 if ((m->flags & PG_ZERO) == 0) 2213 pagezero(pc); 2214 pc->pc_pmap = pmap; 2215 pc->pc_map[0] = pc_freemask[0] & ~1ul; /* preallocated bit 0 */ 2216 for (field = 1; field < _NPCM; field++) 2217 pc->pc_map[field] = pc_freemask[field]; 2218 pv = &pc->pc_pventry[0]; 2219 TAILQ_INSERT_HEAD(&pmap->pm_pvchunk, pc, pc_list); 2220 PV_STAT(pv_entry_spare += _NPCPV - 1); 2221 return (pv); 2222} 2223 2224static __inline pv_entry_t 2225pmap_pvh_remove(struct md_page *pvh, pmap_t pmap, vm_offset_t va) 2226{ 2227 pv_entry_t pv; 2228 2229 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 2230 TAILQ_FOREACH(pv, &pvh->pv_list, pv_list) { 2231 if (pmap == PV_PMAP(pv) && va == pv->pv_va) { 2232 TAILQ_REMOVE(&pvh->pv_list, pv, pv_list); 2233 break; 2234 } 2235 } 2236 return (pv); 2237} 2238 2239static void 2240pmap_pvh_free(struct md_page *pvh, pmap_t pmap, vm_offset_t va) 2241{ 2242 pv_entry_t pv; 2243 2244 pv = pmap_pvh_remove(pvh, pmap, va); 2245 KASSERT(pv != NULL, ("pmap_pvh_free: pv not found")); 2246 free_pv_entry(pmap, pv); 2247} 2248 2249static void 2250pmap_remove_entry(pmap_t pmap, vm_page_t m, vm_offset_t va) 2251{ 2252 2253 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 2254 pmap_pvh_free(&m->md, pmap, va); 2255 if (TAILQ_EMPTY(&m->md.pv_list)) 2256 vm_page_flag_clear(m, PG_WRITEABLE); 2257} 2258 2259/* 2260 * Conditionally create a pv entry. 2261 */ 2262static boolean_t 2263pmap_try_insert_pv_entry(pmap_t pmap, vm_offset_t va, vm_page_t m) 2264{ 2265 pv_entry_t pv; 2266 2267 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 2268 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 2269 if (pv_entry_count < pv_entry_high_water && 2270 (pv = get_pv_entry(pmap, TRUE)) != NULL) { 2271 pv->pv_va = va; 2272 TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list); 2273 return (TRUE); 2274 } else 2275 return (FALSE); 2276} 2277 2278/* 2279 * pmap_remove_pte: do the things to unmap a page in a process 2280 */ 2281static int 2282pmap_remove_pte(pmap_t pmap, pt_entry_t *ptq, vm_offset_t va, vm_page_t *free) 2283{ 2284 pt_entry_t oldpte; 2285 vm_page_t m; 2286 2287 CTR3(KTR_PMAP, "pmap_remove_pte: pmap=%p *ptq=0x%x va=0x%x", 2288 pmap, (u_long)*ptq, va); 2289 2290 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 2291 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 2292 oldpte = *ptq; 2293 PT_SET_VA_MA(ptq, 0, TRUE); 2294 if (oldpte & PG_W) 2295 pmap->pm_stats.wired_count -= 1; 2296 /* 2297 * Machines that don't support invlpg, also don't support 2298 * PG_G. 2299 */ 2300 if (oldpte & PG_G) 2301 pmap_invalidate_page(kernel_pmap, va); 2302 pmap->pm_stats.resident_count -= 1; 2303 /* 2304 * XXX This is not strictly correctly, but somewhere along the line 2305 * we are losing the managed bit on some pages. It is unclear to me 2306 * why, but I think the most likely explanation is that xen's writable 2307 * page table implementation doesn't respect the unused bits. 2308 */ 2309 if ((oldpte & PG_MANAGED) || ((oldpte & PG_V) && (va < VM_MAXUSER_ADDRESS)) 2310 ) { 2311 m = PHYS_TO_VM_PAGE(xpmap_mtop(oldpte) & PG_FRAME); 2312 2313 if (!(oldpte & PG_MANAGED)) 2314 printf("va=0x%x is unmanaged :-( pte=0x%llx\n", va, oldpte); 2315 2316 if ((oldpte & (PG_M | PG_RW)) == (PG_M | PG_RW)) 2317 vm_page_dirty(m); 2318 if (oldpte & PG_A) 2319 vm_page_flag_set(m, PG_REFERENCED); 2320 pmap_remove_entry(pmap, m, va); 2321 } else if ((va < VM_MAXUSER_ADDRESS) && (oldpte & PG_V)) 2322 printf("va=0x%x is unmanaged :-( pte=0x%llx\n", va, oldpte); 2323 2324 return (pmap_unuse_pt(pmap, va, free)); 2325} 2326 2327/* 2328 * Remove a single page from a process address space 2329 */ 2330static void 2331pmap_remove_page(pmap_t pmap, vm_offset_t va, vm_page_t *free) 2332{ 2333 pt_entry_t *pte; 2334 2335 CTR2(KTR_PMAP, "pmap_remove_page: pmap=%p va=0x%x", 2336 pmap, va); 2337 2338 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 2339 KASSERT(curthread->td_pinned > 0, ("curthread not pinned")); 2340 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 2341 if ((pte = pmap_pte_quick(pmap, va)) == NULL || (*pte & PG_V) == 0) 2342 return; 2343 pmap_remove_pte(pmap, pte, va, free); 2344 pmap_invalidate_page(pmap, va); 2345 if (*PMAP1) 2346 PT_SET_MA(PADDR1, 0); 2347 2348} 2349 2350/* 2351 * Remove the given range of addresses from the specified map. 2352 * 2353 * It is assumed that the start and end are properly 2354 * rounded to the page size. 2355 */ 2356void 2357pmap_remove(pmap_t pmap, vm_offset_t sva, vm_offset_t eva) 2358{ 2359 vm_offset_t pdnxt; 2360 pd_entry_t ptpaddr; 2361 pt_entry_t *pte; 2362 vm_page_t free = NULL; 2363 int anyvalid; 2364 2365 CTR3(KTR_PMAP, "pmap_remove: pmap=%p sva=0x%x eva=0x%x", 2366 pmap, sva, eva); 2367 2368 /* 2369 * Perform an unsynchronized read. This is, however, safe. 2370 */ 2371 if (pmap->pm_stats.resident_count == 0) 2372 return; 2373 2374 anyvalid = 0; 2375 2376 vm_page_lock_queues(); 2377 sched_pin(); 2378 PMAP_LOCK(pmap); 2379 2380 /* 2381 * special handling of removing one page. a very 2382 * common operation and easy to short circuit some 2383 * code. 2384 */ 2385 if ((sva + PAGE_SIZE == eva) && 2386 ((pmap->pm_pdir[(sva >> PDRSHIFT)] & PG_PS) == 0)) { 2387 pmap_remove_page(pmap, sva, &free); 2388 goto out; 2389 } 2390 2391 for (; sva < eva; sva = pdnxt) { 2392 unsigned pdirindex; 2393 2394 /* 2395 * Calculate index for next page table. 2396 */ 2397 pdnxt = (sva + NBPDR) & ~PDRMASK; 2398 if (pmap->pm_stats.resident_count == 0) 2399 break; 2400 2401 pdirindex = sva >> PDRSHIFT; 2402 ptpaddr = pmap->pm_pdir[pdirindex]; 2403 2404 /* 2405 * Weed out invalid mappings. Note: we assume that the page 2406 * directory table is always allocated, and in kernel virtual. 2407 */ 2408 if (ptpaddr == 0) 2409 continue; 2410 2411 /* 2412 * Check for large page. 2413 */ 2414 if ((ptpaddr & PG_PS) != 0) { 2415 PD_CLEAR_VA(pmap, pdirindex, TRUE); 2416 pmap->pm_stats.resident_count -= NBPDR / PAGE_SIZE; 2417 anyvalid = 1; 2418 continue; 2419 } 2420 2421 /* 2422 * Limit our scan to either the end of the va represented 2423 * by the current page table page, or to the end of the 2424 * range being removed. 2425 */ 2426 if (pdnxt > eva) 2427 pdnxt = eva; 2428 2429 for (pte = pmap_pte_quick(pmap, sva); sva != pdnxt; pte++, 2430 sva += PAGE_SIZE) { 2431 if ((*pte & PG_V) == 0) 2432 continue; 2433 2434 /* 2435 * The TLB entry for a PG_G mapping is invalidated 2436 * by pmap_remove_pte(). 2437 */ 2438 if ((*pte & PG_G) == 0) 2439 anyvalid = 1; 2440 if (pmap_remove_pte(pmap, pte, sva, &free)) 2441 break; 2442 } 2443 } 2444 PT_UPDATES_FLUSH(); 2445 if (*PMAP1) 2446 PT_SET_VA_MA(PMAP1, 0, TRUE); 2447out: 2448 if (anyvalid) 2449 pmap_invalidate_all(pmap); 2450 sched_unpin(); 2451 vm_page_unlock_queues(); 2452 PMAP_UNLOCK(pmap); 2453 pmap_free_zero_pages(free); 2454} 2455 2456/* 2457 * Routine: pmap_remove_all 2458 * Function: 2459 * Removes this physical page from 2460 * all physical maps in which it resides. 2461 * Reflects back modify bits to the pager. 2462 * 2463 * Notes: 2464 * Original versions of this routine were very 2465 * inefficient because they iteratively called 2466 * pmap_remove (slow...) 2467 */ 2468 2469void 2470pmap_remove_all(vm_page_t m) 2471{ 2472 pv_entry_t pv; 2473 pmap_t pmap; 2474 pt_entry_t *pte, tpte; 2475 vm_page_t free; 2476 2477 KASSERT((m->flags & PG_FICTITIOUS) == 0, 2478 ("pmap_remove_all: page %p is fictitious", m)); 2479 free = NULL; 2480 vm_page_lock_queues(); 2481 sched_pin(); 2482 while ((pv = TAILQ_FIRST(&m->md.pv_list)) != NULL) { 2483 pmap = PV_PMAP(pv); 2484 PMAP_LOCK(pmap); 2485 pmap->pm_stats.resident_count--; 2486 pte = pmap_pte_quick(pmap, pv->pv_va); 2487 2488 tpte = *pte; 2489 PT_SET_VA_MA(pte, 0, TRUE); 2490 if (tpte & PG_W) 2491 pmap->pm_stats.wired_count--; 2492 if (tpte & PG_A) 2493 vm_page_flag_set(m, PG_REFERENCED); 2494 2495 /* 2496 * Update the vm_page_t clean and reference bits. 2497 */ 2498 if ((tpte & (PG_M | PG_RW)) == (PG_M | PG_RW)) 2499 vm_page_dirty(m); 2500 pmap_unuse_pt(pmap, pv->pv_va, &free); 2501 pmap_invalidate_page(pmap, pv->pv_va); 2502 TAILQ_REMOVE(&m->md.pv_list, pv, pv_list); 2503 free_pv_entry(pmap, pv); 2504 PMAP_UNLOCK(pmap); 2505 } 2506 vm_page_flag_clear(m, PG_WRITEABLE); 2507 PT_UPDATES_FLUSH(); 2508 if (*PMAP1) 2509 PT_SET_MA(PADDR1, 0); 2510 sched_unpin(); 2511 vm_page_unlock_queues(); 2512 pmap_free_zero_pages(free); 2513} 2514 2515/* 2516 * Set the physical protection on the 2517 * specified range of this map as requested. 2518 */ 2519void 2520pmap_protect(pmap_t pmap, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot) 2521{ 2522 vm_offset_t pdnxt; 2523 pd_entry_t ptpaddr; 2524 pt_entry_t *pte; 2525 int anychanged; 2526 2527 CTR4(KTR_PMAP, "pmap_protect: pmap=%p sva=0x%x eva=0x%x prot=0x%x", 2528 pmap, sva, eva, prot); 2529 2530 if ((prot & VM_PROT_READ) == VM_PROT_NONE) { 2531 pmap_remove(pmap, sva, eva); 2532 return; 2533 } 2534 2535#ifdef PAE 2536 if ((prot & (VM_PROT_WRITE|VM_PROT_EXECUTE)) == 2537 (VM_PROT_WRITE|VM_PROT_EXECUTE)) 2538 return; 2539#else 2540 if (prot & VM_PROT_WRITE) 2541 return; 2542#endif 2543 2544 anychanged = 0; 2545 2546 vm_page_lock_queues(); 2547 sched_pin(); 2548 PMAP_LOCK(pmap); 2549 for (; sva < eva; sva = pdnxt) { 2550 pt_entry_t obits, pbits; 2551 unsigned pdirindex; 2552 2553 pdnxt = (sva + NBPDR) & ~PDRMASK; 2554 2555 pdirindex = sva >> PDRSHIFT; 2556 ptpaddr = pmap->pm_pdir[pdirindex]; 2557 2558 /* 2559 * Weed out invalid mappings. Note: we assume that the page 2560 * directory table is always allocated, and in kernel virtual. 2561 */ 2562 if (ptpaddr == 0) 2563 continue; 2564 2565 /* 2566 * Check for large page. 2567 */ 2568 if ((ptpaddr & PG_PS) != 0) { 2569 if ((prot & VM_PROT_WRITE) == 0) 2570 pmap->pm_pdir[pdirindex] &= ~(PG_M|PG_RW); 2571#ifdef PAE 2572 if ((prot & VM_PROT_EXECUTE) == 0) 2573 pmap->pm_pdir[pdirindex] |= pg_nx; 2574#endif 2575 anychanged = 1; 2576 continue; 2577 } 2578 2579 if (pdnxt > eva) 2580 pdnxt = eva; 2581 2582 for (pte = pmap_pte_quick(pmap, sva); sva != pdnxt; pte++, 2583 sva += PAGE_SIZE) { 2584 vm_page_t m; 2585 2586retry: 2587 /* 2588 * Regardless of whether a pte is 32 or 64 bits in 2589 * size, PG_RW, PG_A, and PG_M are among the least 2590 * significant 32 bits. 2591 */ 2592 obits = pbits = *pte; 2593 if ((pbits & PG_V) == 0) 2594 continue; 2595 2596 if ((prot & VM_PROT_WRITE) == 0) { 2597 if ((pbits & (PG_MANAGED | PG_M | PG_RW)) == 2598 (PG_MANAGED | PG_M | PG_RW)) { 2599 m = PHYS_TO_VM_PAGE(xpmap_mtop(pbits) & 2600 PG_FRAME); 2601 vm_page_dirty(m); 2602 } 2603 pbits &= ~(PG_RW | PG_M); 2604 } 2605#ifdef PAE 2606 if ((prot & VM_PROT_EXECUTE) == 0) 2607 pbits |= pg_nx; 2608#endif 2609 2610 if (pbits != obits) { 2611#ifdef XEN 2612 obits = *pte; 2613 PT_SET_VA_MA(pte, pbits, TRUE); 2614 if (*pte != pbits) 2615 goto retry; 2616#else 2617#ifdef PAE 2618 if (!atomic_cmpset_64(pte, obits, pbits)) 2619 goto retry; 2620#else 2621 if (!atomic_cmpset_int((u_int *)pte, obits, 2622 pbits)) 2623 goto retry; 2624#endif 2625#endif 2626 if (obits & PG_G) 2627 pmap_invalidate_page(pmap, sva); 2628 else 2629 anychanged = 1; 2630 } 2631 } 2632 } 2633 PT_UPDATES_FLUSH(); 2634 if (*PMAP1) 2635 PT_SET_VA_MA(PMAP1, 0, TRUE); 2636 if (anychanged) 2637 pmap_invalidate_all(pmap); 2638 sched_unpin(); 2639 vm_page_unlock_queues(); 2640 PMAP_UNLOCK(pmap); 2641} 2642 2643/* 2644 * Insert the given physical page (p) at 2645 * the specified virtual address (v) in the 2646 * target physical map with the protection requested. 2647 * 2648 * If specified, the page will be wired down, meaning 2649 * that the related pte can not be reclaimed. 2650 * 2651 * NB: This is the only routine which MAY NOT lazy-evaluate 2652 * or lose information. That is, this routine must actually 2653 * insert this page into the given map NOW. 2654 */ 2655void 2656pmap_enter(pmap_t pmap, vm_offset_t va, vm_prot_t access, vm_page_t m, 2657 vm_prot_t prot, boolean_t wired) 2658{ 2659 pd_entry_t *pde; 2660 pt_entry_t *pte; 2661 pt_entry_t newpte, origpte; 2662 pv_entry_t pv; 2663 vm_paddr_t opa, pa; 2664 vm_page_t mpte, om; 2665 boolean_t invlva; 2666 2667 CTR6(KTR_PMAP, "pmap_enter: pmap=%08p va=0x%08x access=0x%x ma=0x%08x prot=0x%x wired=%d", 2668 pmap, va, access, xpmap_ptom(VM_PAGE_TO_PHYS(m)), prot, wired); 2669 va = trunc_page(va); 2670 KASSERT(va <= VM_MAX_KERNEL_ADDRESS, ("pmap_enter: toobig")); 2671 KASSERT(va < UPT_MIN_ADDRESS || va >= UPT_MAX_ADDRESS, 2672 ("pmap_enter: invalid to pmap_enter page table pages (va: 0x%x)", 2673 va)); 2674 KASSERT((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0 || 2675 (m->oflags & VPO_BUSY) != 0, 2676 ("pmap_enter: page %p is not busy", m)); 2677 2678 mpte = NULL; 2679 2680 vm_page_lock_queues(); 2681 PMAP_LOCK(pmap); 2682 sched_pin(); 2683 2684 /* 2685 * In the case that a page table page is not 2686 * resident, we are creating it here. 2687 */ 2688 if (va < VM_MAXUSER_ADDRESS) { 2689 mpte = pmap_allocpte(pmap, va, M_WAITOK); 2690 } 2691 2692 pde = pmap_pde(pmap, va); 2693 if ((*pde & PG_PS) != 0) 2694 panic("pmap_enter: attempted pmap_enter on 4MB page"); 2695 pte = pmap_pte_quick(pmap, va); 2696 2697 /* 2698 * Page Directory table entry not valid, we need a new PT page 2699 */ 2700 if (pte == NULL) { 2701 panic("pmap_enter: invalid page directory pdir=%#jx, va=%#x", 2702 (uintmax_t)pmap->pm_pdir[va >> PDRSHIFT], va); 2703 } 2704 2705 pa = VM_PAGE_TO_PHYS(m); 2706 om = NULL; 2707 opa = origpte = 0; 2708 2709#if 0 2710 KASSERT((*pte & PG_V) || (*pte == 0), ("address set but not valid pte=%p *pte=0x%016jx", 2711 pte, *pte)); 2712#endif 2713 origpte = *pte; 2714 if (origpte) 2715 origpte = xpmap_mtop(origpte); 2716 opa = origpte & PG_FRAME; 2717 2718 /* 2719 * Mapping has not changed, must be protection or wiring change. 2720 */ 2721 if (origpte && (opa == pa)) { 2722 /* 2723 * Wiring change, just update stats. We don't worry about 2724 * wiring PT pages as they remain resident as long as there 2725 * are valid mappings in them. Hence, if a user page is wired, 2726 * the PT page will be also. 2727 */ 2728 if (wired && ((origpte & PG_W) == 0)) 2729 pmap->pm_stats.wired_count++; 2730 else if (!wired && (origpte & PG_W)) 2731 pmap->pm_stats.wired_count--; 2732 2733 /* 2734 * Remove extra pte reference 2735 */ 2736 if (mpte) 2737 mpte->wire_count--; 2738 2739 if (origpte & PG_MANAGED) { 2740 om = m; 2741 pa |= PG_MANAGED; 2742 } 2743 goto validate; 2744 } 2745 2746 pv = NULL; 2747 2748 /* 2749 * Mapping has changed, invalidate old range and fall through to 2750 * handle validating new mapping. 2751 */ 2752 if (opa) { 2753 if (origpte & PG_W) 2754 pmap->pm_stats.wired_count--; 2755 if (origpte & PG_MANAGED) { 2756 om = PHYS_TO_VM_PAGE(opa); 2757 pv = pmap_pvh_remove(&om->md, pmap, va); 2758 } else if (va < VM_MAXUSER_ADDRESS) 2759 printf("va=0x%x is unmanaged :-( \n", va); 2760 2761 if (mpte != NULL) { 2762 mpte->wire_count--; 2763 KASSERT(mpte->wire_count > 0, 2764 ("pmap_enter: missing reference to page table page," 2765 " va: 0x%x", va)); 2766 } 2767 } else 2768 pmap->pm_stats.resident_count++; 2769 2770 /* 2771 * Enter on the PV list if part of our managed memory. 2772 */ 2773 if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0) { 2774 KASSERT(va < kmi.clean_sva || va >= kmi.clean_eva, 2775 ("pmap_enter: managed mapping within the clean submap")); 2776 if (pv == NULL) 2777 pv = get_pv_entry(pmap, FALSE); 2778 pv->pv_va = va; 2779 TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list); 2780 pa |= PG_MANAGED; 2781 } else if (pv != NULL) 2782 free_pv_entry(pmap, pv); 2783 2784 /* 2785 * Increment counters 2786 */ 2787 if (wired) 2788 pmap->pm_stats.wired_count++; 2789 2790validate: 2791 /* 2792 * Now validate mapping with desired protection/wiring. 2793 */ 2794 newpte = (pt_entry_t)(pa | PG_V); 2795 if ((prot & VM_PROT_WRITE) != 0) { 2796 newpte |= PG_RW; 2797 if ((newpte & PG_MANAGED) != 0) 2798 vm_page_flag_set(m, PG_WRITEABLE); 2799 } 2800#ifdef PAE 2801 if ((prot & VM_PROT_EXECUTE) == 0) 2802 newpte |= pg_nx; 2803#endif 2804 if (wired) 2805 newpte |= PG_W; 2806 if (va < VM_MAXUSER_ADDRESS) 2807 newpte |= PG_U; 2808 if (pmap == kernel_pmap) 2809 newpte |= pgeflag; 2810 2811 critical_enter(); 2812 /* 2813 * if the mapping or permission bits are different, we need 2814 * to update the pte. 2815 */ 2816 if ((origpte & ~(PG_M|PG_A)) != newpte) { 2817 if (origpte) { 2818 invlva = FALSE; 2819 origpte = *pte; 2820 PT_SET_VA(pte, newpte | PG_A, FALSE); 2821 if (origpte & PG_A) { 2822 if (origpte & PG_MANAGED) 2823 vm_page_flag_set(om, PG_REFERENCED); 2824 if (opa != VM_PAGE_TO_PHYS(m)) 2825 invlva = TRUE; 2826#ifdef PAE 2827 if ((origpte & PG_NX) == 0 && 2828 (newpte & PG_NX) != 0) 2829 invlva = TRUE; 2830#endif 2831 } 2832 if ((origpte & (PG_M | PG_RW)) == (PG_M | PG_RW)) { 2833 if ((origpte & PG_MANAGED) != 0) 2834 vm_page_dirty(om); 2835 if ((prot & VM_PROT_WRITE) == 0) 2836 invlva = TRUE; 2837 } 2838 if ((origpte & PG_MANAGED) != 0 && 2839 TAILQ_EMPTY(&om->md.pv_list)) 2840 vm_page_flag_clear(om, PG_WRITEABLE); 2841 if (invlva) 2842 pmap_invalidate_page(pmap, va); 2843 } else{ 2844 PT_SET_VA(pte, newpte | PG_A, FALSE); 2845 } 2846 2847 } 2848 PT_UPDATES_FLUSH(); 2849 critical_exit(); 2850 if (*PMAP1) 2851 PT_SET_VA_MA(PMAP1, 0, TRUE); 2852 sched_unpin(); 2853 vm_page_unlock_queues(); 2854 PMAP_UNLOCK(pmap); 2855} 2856 2857/* 2858 * Maps a sequence of resident pages belonging to the same object. 2859 * The sequence begins with the given page m_start. This page is 2860 * mapped at the given virtual address start. Each subsequent page is 2861 * mapped at a virtual address that is offset from start by the same 2862 * amount as the page is offset from m_start within the object. The 2863 * last page in the sequence is the page with the largest offset from 2864 * m_start that can be mapped at a virtual address less than the given 2865 * virtual address end. Not every virtual page between start and end 2866 * is mapped; only those for which a resident page exists with the 2867 * corresponding offset from m_start are mapped. 2868 */ 2869void 2870pmap_enter_object(pmap_t pmap, vm_offset_t start, vm_offset_t end, 2871 vm_page_t m_start, vm_prot_t prot) 2872{ 2873 vm_page_t m, mpte; 2874 vm_pindex_t diff, psize; 2875 multicall_entry_t mcl[16]; 2876 multicall_entry_t *mclp = mcl; 2877 int error, count = 0; 2878 2879 VM_OBJECT_LOCK_ASSERT(m_start->object, MA_OWNED); 2880 psize = atop(end - start); 2881 2882 mpte = NULL; 2883 m = m_start; 2884 vm_page_lock_queues(); 2885 PMAP_LOCK(pmap); 2886 while (m != NULL && (diff = m->pindex - m_start->pindex) < psize) { 2887 mpte = pmap_enter_quick_locked(&mclp, &count, pmap, start + ptoa(diff), m, 2888 prot, mpte); 2889 m = TAILQ_NEXT(m, listq); 2890 if (count == 16) { 2891 error = HYPERVISOR_multicall(mcl, count); 2892 KASSERT(error == 0, ("bad multicall %d", error)); 2893 mclp = mcl; 2894 count = 0; 2895 } 2896 } 2897 if (count) { 2898 error = HYPERVISOR_multicall(mcl, count); 2899 KASSERT(error == 0, ("bad multicall %d", error)); 2900 } 2901 vm_page_unlock_queues(); 2902 PMAP_UNLOCK(pmap); 2903} 2904 2905/* 2906 * this code makes some *MAJOR* assumptions: 2907 * 1. Current pmap & pmap exists. 2908 * 2. Not wired. 2909 * 3. Read access. 2910 * 4. No page table pages. 2911 * but is *MUCH* faster than pmap_enter... 2912 */ 2913 2914void 2915pmap_enter_quick(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot) 2916{ 2917 multicall_entry_t mcl, *mclp; 2918 int count = 0; 2919 mclp = &mcl; 2920 2921 CTR4(KTR_PMAP, "pmap_enter_quick: pmap=%p va=0x%x m=%p prot=0x%x", 2922 pmap, va, m, prot); 2923 2924 vm_page_lock_queues(); 2925 PMAP_LOCK(pmap); 2926 (void)pmap_enter_quick_locked(&mclp, &count, pmap, va, m, prot, NULL); 2927 if (count) 2928 HYPERVISOR_multicall(&mcl, count); 2929 vm_page_unlock_queues(); 2930 PMAP_UNLOCK(pmap); 2931} 2932 2933#ifdef notyet 2934void 2935pmap_enter_quick_range(pmap_t pmap, vm_offset_t *addrs, vm_page_t *pages, vm_prot_t *prots, int count) 2936{ 2937 int i, error, index = 0; 2938 multicall_entry_t mcl[16]; 2939 multicall_entry_t *mclp = mcl; 2940 2941 PMAP_LOCK(pmap); 2942 for (i = 0; i < count; i++, addrs++, pages++, prots++) { 2943 if (!pmap_is_prefaultable_locked(pmap, *addrs)) 2944 continue; 2945 2946 (void) pmap_enter_quick_locked(&mclp, &index, pmap, *addrs, *pages, *prots, NULL); 2947 if (index == 16) { 2948 error = HYPERVISOR_multicall(mcl, index); 2949 mclp = mcl; 2950 index = 0; 2951 KASSERT(error == 0, ("bad multicall %d", error)); 2952 } 2953 } 2954 if (index) { 2955 error = HYPERVISOR_multicall(mcl, index); 2956 KASSERT(error == 0, ("bad multicall %d", error)); 2957 } 2958 2959 PMAP_UNLOCK(pmap); 2960} 2961#endif 2962 2963static vm_page_t 2964pmap_enter_quick_locked(multicall_entry_t **mclpp, int *count, pmap_t pmap, vm_offset_t va, vm_page_t m, 2965 vm_prot_t prot, vm_page_t mpte) 2966{ 2967 pt_entry_t *pte; 2968 vm_paddr_t pa; 2969 vm_page_t free; 2970 multicall_entry_t *mcl = *mclpp; 2971 2972 KASSERT(va < kmi.clean_sva || va >= kmi.clean_eva || 2973 (m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0, 2974 ("pmap_enter_quick_locked: managed mapping within the clean submap")); 2975 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 2976 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 2977 2978 /* 2979 * In the case that a page table page is not 2980 * resident, we are creating it here. 2981 */ 2982 if (va < VM_MAXUSER_ADDRESS) { 2983 unsigned ptepindex; 2984 pd_entry_t ptema; 2985 2986 /* 2987 * Calculate pagetable page index 2988 */ 2989 ptepindex = va >> PDRSHIFT; 2990 if (mpte && (mpte->pindex == ptepindex)) { 2991 mpte->wire_count++; 2992 } else { 2993 /* 2994 * Get the page directory entry 2995 */ 2996 ptema = pmap->pm_pdir[ptepindex]; 2997 2998 /* 2999 * If the page table page is mapped, we just increment 3000 * the hold count, and activate it. 3001 */ 3002 if (ptema & PG_V) { 3003 if (ptema & PG_PS) 3004 panic("pmap_enter_quick: unexpected mapping into 4MB page"); 3005 mpte = PHYS_TO_VM_PAGE(xpmap_mtop(ptema) & PG_FRAME); 3006 mpte->wire_count++; 3007 } else { 3008 mpte = _pmap_allocpte(pmap, ptepindex, 3009 M_NOWAIT); 3010 if (mpte == NULL) 3011 return (mpte); 3012 } 3013 } 3014 } else { 3015 mpte = NULL; 3016 } 3017 3018 /* 3019 * This call to vtopte makes the assumption that we are 3020 * entering the page into the current pmap. In order to support 3021 * quick entry into any pmap, one would likely use pmap_pte_quick. 3022 * But that isn't as quick as vtopte. 3023 */ 3024 KASSERT(pmap_is_current(pmap), ("entering pages in non-current pmap")); 3025 pte = vtopte(va); 3026 if (*pte & PG_V) { 3027 if (mpte != NULL) { 3028 mpte->wire_count--; 3029 mpte = NULL; 3030 } 3031 return (mpte); 3032 } 3033 3034 /* 3035 * Enter on the PV list if part of our managed memory. 3036 */ 3037 if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0 && 3038 !pmap_try_insert_pv_entry(pmap, va, m)) { 3039 if (mpte != NULL) { 3040 free = NULL; 3041 if (pmap_unwire_pte_hold(pmap, mpte, &free)) { 3042 pmap_invalidate_page(pmap, va); 3043 pmap_free_zero_pages(free); 3044 } 3045 3046 mpte = NULL; 3047 } 3048 return (mpte); 3049 } 3050 3051 /* 3052 * Increment counters 3053 */ 3054 pmap->pm_stats.resident_count++; 3055 3056 pa = VM_PAGE_TO_PHYS(m); 3057#ifdef PAE 3058 if ((prot & VM_PROT_EXECUTE) == 0) 3059 pa |= pg_nx; 3060#endif 3061 3062#if 0 3063 /* 3064 * Now validate mapping with RO protection 3065 */ 3066 if (m->flags & (PG_FICTITIOUS|PG_UNMANAGED)) 3067 pte_store(pte, pa | PG_V | PG_U); 3068 else 3069 pte_store(pte, pa | PG_V | PG_U | PG_MANAGED); 3070#else 3071 /* 3072 * Now validate mapping with RO protection 3073 */ 3074 if (m->flags & (PG_FICTITIOUS|PG_UNMANAGED)) 3075 pa = xpmap_ptom(pa | PG_V | PG_U); 3076 else 3077 pa = xpmap_ptom(pa | PG_V | PG_U | PG_MANAGED); 3078 3079 mcl->op = __HYPERVISOR_update_va_mapping; 3080 mcl->args[0] = va; 3081 mcl->args[1] = (uint32_t)(pa & 0xffffffff); 3082 mcl->args[2] = (uint32_t)(pa >> 32); 3083 mcl->args[3] = 0; 3084 *mclpp = mcl + 1; 3085 *count = *count + 1; 3086#endif 3087 return mpte; 3088} 3089 3090/* 3091 * Make a temporary mapping for a physical address. This is only intended 3092 * to be used for panic dumps. 3093 */ 3094void * 3095pmap_kenter_temporary(vm_paddr_t pa, int i) 3096{ 3097 vm_offset_t va; 3098 vm_paddr_t ma = xpmap_ptom(pa); 3099 3100 va = (vm_offset_t)crashdumpmap + (i * PAGE_SIZE); 3101 PT_SET_MA(va, (ma & ~PAGE_MASK) | PG_V | pgeflag); 3102 invlpg(va); 3103 return ((void *)crashdumpmap); 3104} 3105 3106/* 3107 * This code maps large physical mmap regions into the 3108 * processor address space. Note that some shortcuts 3109 * are taken, but the code works. 3110 */ 3111void 3112pmap_object_init_pt(pmap_t pmap, vm_offset_t addr, 3113 vm_object_t object, vm_pindex_t pindex, 3114 vm_size_t size) 3115{ 3116 pd_entry_t *pde; 3117 vm_paddr_t pa, ptepa; 3118 vm_page_t p; 3119 int pat_mode; 3120 3121 VM_OBJECT_LOCK_ASSERT(object, MA_OWNED); 3122 KASSERT(object->type == OBJT_DEVICE || object->type == OBJT_SG, 3123 ("pmap_object_init_pt: non-device object")); 3124 if (pseflag && 3125 (addr & (NBPDR - 1)) == 0 && (size & (NBPDR - 1)) == 0) { 3126 if (!vm_object_populate(object, pindex, pindex + atop(size))) 3127 return; 3128 p = vm_page_lookup(object, pindex); 3129 KASSERT(p->valid == VM_PAGE_BITS_ALL, 3130 ("pmap_object_init_pt: invalid page %p", p)); 3131 pat_mode = p->md.pat_mode; 3132 /* 3133 * Abort the mapping if the first page is not physically 3134 * aligned to a 2/4MB page boundary. 3135 */ 3136 ptepa = VM_PAGE_TO_PHYS(p); 3137 if (ptepa & (NBPDR - 1)) 3138 return; 3139 /* 3140 * Skip the first page. Abort the mapping if the rest of 3141 * the pages are not physically contiguous or have differing 3142 * memory attributes. 3143 */ 3144 p = TAILQ_NEXT(p, listq); 3145 for (pa = ptepa + PAGE_SIZE; pa < ptepa + size; 3146 pa += PAGE_SIZE) { 3147 KASSERT(p->valid == VM_PAGE_BITS_ALL, 3148 ("pmap_object_init_pt: invalid page %p", p)); 3149 if (pa != VM_PAGE_TO_PHYS(p) || 3150 pat_mode != p->md.pat_mode) 3151 return; 3152 p = TAILQ_NEXT(p, listq); 3153 } 3154 /* Map using 2/4MB pages. */ 3155 PMAP_LOCK(pmap); 3156 for (pa = ptepa | pmap_cache_bits(pat_mode, 1); pa < ptepa + 3157 size; pa += NBPDR) { 3158 pde = pmap_pde(pmap, addr); 3159 if (*pde == 0) { 3160 pde_store(pde, pa | PG_PS | PG_M | PG_A | 3161 PG_U | PG_RW | PG_V); 3162 pmap->pm_stats.resident_count += NBPDR / 3163 PAGE_SIZE; 3164 pmap_pde_mappings++; 3165 } 3166 /* Else continue on if the PDE is already valid. */ 3167 addr += NBPDR; 3168 } 3169 PMAP_UNLOCK(pmap); 3170 } 3171} 3172 3173/* 3174 * Routine: pmap_change_wiring 3175 * Function: Change the wiring attribute for a map/virtual-address 3176 * pair. 3177 * In/out conditions: 3178 * The mapping must already exist in the pmap. 3179 */ 3180void 3181pmap_change_wiring(pmap_t pmap, vm_offset_t va, boolean_t wired) 3182{ 3183 pt_entry_t *pte; 3184 3185 vm_page_lock_queues(); 3186 PMAP_LOCK(pmap); 3187 pte = pmap_pte(pmap, va); 3188 3189 if (wired && !pmap_pte_w(pte)) { 3190 PT_SET_VA_MA((pte), *(pte) | PG_W, TRUE); 3191 pmap->pm_stats.wired_count++; 3192 } else if (!wired && pmap_pte_w(pte)) { 3193 PT_SET_VA_MA((pte), *(pte) & ~PG_W, TRUE); 3194 pmap->pm_stats.wired_count--; 3195 } 3196 3197 /* 3198 * Wiring is not a hardware characteristic so there is no need to 3199 * invalidate TLB. 3200 */ 3201 pmap_pte_release(pte); 3202 PMAP_UNLOCK(pmap); 3203 vm_page_unlock_queues(); 3204} 3205 3206 3207 3208/* 3209 * Copy the range specified by src_addr/len 3210 * from the source map to the range dst_addr/len 3211 * in the destination map. 3212 * 3213 * This routine is only advisory and need not do anything. 3214 */ 3215 3216void 3217pmap_copy(pmap_t dst_pmap, pmap_t src_pmap, vm_offset_t dst_addr, vm_size_t len, 3218 vm_offset_t src_addr) 3219{ 3220 vm_page_t free; 3221 vm_offset_t addr; 3222 vm_offset_t end_addr = src_addr + len; 3223 vm_offset_t pdnxt; 3224 3225 if (dst_addr != src_addr) 3226 return; 3227 3228 if (!pmap_is_current(src_pmap)) { 3229 CTR2(KTR_PMAP, 3230 "pmap_copy, skipping: pdir[PTDPTDI]=0x%jx PTDpde[0]=0x%jx", 3231 (src_pmap->pm_pdir[PTDPTDI] & PG_FRAME), (PTDpde[0] & PG_FRAME)); 3232 3233 return; 3234 } 3235 CTR5(KTR_PMAP, "pmap_copy: dst_pmap=%p src_pmap=%p dst_addr=0x%x len=%d src_addr=0x%x", 3236 dst_pmap, src_pmap, dst_addr, len, src_addr); 3237 3238 vm_page_lock_queues(); 3239 if (dst_pmap < src_pmap) { 3240 PMAP_LOCK(dst_pmap); 3241 PMAP_LOCK(src_pmap); 3242 } else { 3243 PMAP_LOCK(src_pmap); 3244 PMAP_LOCK(dst_pmap); 3245 } 3246 sched_pin(); 3247 for (addr = src_addr; addr < end_addr; addr = pdnxt) { 3248 pt_entry_t *src_pte, *dst_pte; 3249 vm_page_t dstmpte, srcmpte; 3250 pd_entry_t srcptepaddr; 3251 unsigned ptepindex; 3252 3253 KASSERT(addr < UPT_MIN_ADDRESS, 3254 ("pmap_copy: invalid to pmap_copy page tables")); 3255 3256 pdnxt = (addr + NBPDR) & ~PDRMASK; 3257 ptepindex = addr >> PDRSHIFT; 3258 3259 srcptepaddr = PT_GET(&src_pmap->pm_pdir[ptepindex]); 3260 if (srcptepaddr == 0) 3261 continue; 3262 3263 if (srcptepaddr & PG_PS) { 3264 if (dst_pmap->pm_pdir[ptepindex] == 0) { 3265 PD_SET_VA(dst_pmap, ptepindex, srcptepaddr & ~PG_W, TRUE); 3266 dst_pmap->pm_stats.resident_count += 3267 NBPDR / PAGE_SIZE; 3268 } 3269 continue; 3270 } 3271 3272 srcmpte = PHYS_TO_VM_PAGE(srcptepaddr & PG_FRAME); 3273 KASSERT(srcmpte->wire_count > 0, 3274 ("pmap_copy: source page table page is unused")); 3275 3276 if (pdnxt > end_addr) 3277 pdnxt = end_addr; 3278 3279 src_pte = vtopte(addr); 3280 while (addr < pdnxt) { 3281 pt_entry_t ptetemp; 3282 ptetemp = *src_pte; 3283 /* 3284 * we only virtual copy managed pages 3285 */ 3286 if ((ptetemp & PG_MANAGED) != 0) { 3287 dstmpte = pmap_allocpte(dst_pmap, addr, 3288 M_NOWAIT); 3289 if (dstmpte == NULL) 3290 break; 3291 dst_pte = pmap_pte_quick(dst_pmap, addr); 3292 if (*dst_pte == 0 && 3293 pmap_try_insert_pv_entry(dst_pmap, addr, 3294 PHYS_TO_VM_PAGE(xpmap_mtop(ptetemp) & PG_FRAME))) { 3295 /* 3296 * Clear the wired, modified, and 3297 * accessed (referenced) bits 3298 * during the copy. 3299 */ 3300 KASSERT(ptetemp != 0, ("src_pte not set")); 3301 PT_SET_VA_MA(dst_pte, ptetemp & ~(PG_W | PG_M | PG_A), TRUE /* XXX debug */); 3302 KASSERT(*dst_pte == (ptetemp & ~(PG_W | PG_M | PG_A)), 3303 ("no pmap copy expected: 0x%jx saw: 0x%jx", 3304 ptetemp & ~(PG_W | PG_M | PG_A), *dst_pte)); 3305 dst_pmap->pm_stats.resident_count++; 3306 } else { 3307 free = NULL; 3308 if (pmap_unwire_pte_hold(dst_pmap, 3309 dstmpte, &free)) { 3310 pmap_invalidate_page(dst_pmap, 3311 addr); 3312 pmap_free_zero_pages(free); 3313 } 3314 } 3315 if (dstmpte->wire_count >= srcmpte->wire_count) 3316 break; 3317 } 3318 addr += PAGE_SIZE; 3319 src_pte++; 3320 } 3321 } 3322 PT_UPDATES_FLUSH(); 3323 sched_unpin(); 3324 vm_page_unlock_queues(); 3325 PMAP_UNLOCK(src_pmap); 3326 PMAP_UNLOCK(dst_pmap); 3327} 3328 3329static __inline void 3330pagezero(void *page) 3331{ 3332#if defined(I686_CPU) 3333 if (cpu_class == CPUCLASS_686) { 3334#if defined(CPU_ENABLE_SSE) 3335 if (cpu_feature & CPUID_SSE2) 3336 sse2_pagezero(page); 3337 else 3338#endif 3339 i686_pagezero(page); 3340 } else 3341#endif 3342 bzero(page, PAGE_SIZE); 3343} 3344 3345/* 3346 * pmap_zero_page zeros the specified hardware page by mapping 3347 * the page into KVM and using bzero to clear its contents. 3348 */ 3349void 3350pmap_zero_page(vm_page_t m) 3351{ 3352 struct sysmaps *sysmaps; 3353 3354 sysmaps = &sysmaps_pcpu[PCPU_GET(cpuid)]; 3355 mtx_lock(&sysmaps->lock); 3356 if (*sysmaps->CMAP2) 3357 panic("pmap_zero_page: CMAP2 busy"); 3358 sched_pin(); 3359 PT_SET_MA(sysmaps->CADDR2, PG_V | PG_RW | xpmap_ptom(VM_PAGE_TO_PHYS(m)) | PG_A | PG_M); 3360 pagezero(sysmaps->CADDR2); 3361 PT_SET_MA(sysmaps->CADDR2, 0); 3362 sched_unpin(); 3363 mtx_unlock(&sysmaps->lock); 3364} 3365 3366/* 3367 * pmap_zero_page_area zeros the specified hardware page by mapping 3368 * the page into KVM and using bzero to clear its contents. 3369 * 3370 * off and size may not cover an area beyond a single hardware page. 3371 */ 3372void 3373pmap_zero_page_area(vm_page_t m, int off, int size) 3374{ 3375 struct sysmaps *sysmaps; 3376 3377 sysmaps = &sysmaps_pcpu[PCPU_GET(cpuid)]; 3378 mtx_lock(&sysmaps->lock); 3379 if (*sysmaps->CMAP2) 3380 panic("pmap_zero_page: CMAP2 busy"); 3381 sched_pin(); 3382 PT_SET_MA(sysmaps->CADDR2, PG_V | PG_RW | xpmap_ptom(VM_PAGE_TO_PHYS(m)) | PG_A | PG_M); 3383 3384 if (off == 0 && size == PAGE_SIZE) 3385 pagezero(sysmaps->CADDR2); 3386 else 3387 bzero((char *)sysmaps->CADDR2 + off, size); 3388 PT_SET_MA(sysmaps->CADDR2, 0); 3389 sched_unpin(); 3390 mtx_unlock(&sysmaps->lock); 3391} 3392 3393/* 3394 * pmap_zero_page_idle zeros the specified hardware page by mapping 3395 * the page into KVM and using bzero to clear its contents. This 3396 * is intended to be called from the vm_pagezero process only and 3397 * outside of Giant. 3398 */ 3399void 3400pmap_zero_page_idle(vm_page_t m) 3401{ 3402 3403 if (*CMAP3) 3404 panic("pmap_zero_page: CMAP3 busy"); 3405 sched_pin(); 3406 PT_SET_MA(CADDR3, PG_V | PG_RW | xpmap_ptom(VM_PAGE_TO_PHYS(m)) | PG_A | PG_M); 3407 pagezero(CADDR3); 3408 PT_SET_MA(CADDR3, 0); 3409 sched_unpin(); 3410} 3411 3412/* 3413 * pmap_copy_page copies the specified (machine independent) 3414 * page by mapping the page into virtual memory and using 3415 * bcopy to copy the page, one machine dependent page at a 3416 * time. 3417 */ 3418void 3419pmap_copy_page(vm_page_t src, vm_page_t dst) 3420{ 3421 struct sysmaps *sysmaps; 3422 3423 sysmaps = &sysmaps_pcpu[PCPU_GET(cpuid)]; 3424 mtx_lock(&sysmaps->lock); 3425 if (*sysmaps->CMAP1) 3426 panic("pmap_copy_page: CMAP1 busy"); 3427 if (*sysmaps->CMAP2) 3428 panic("pmap_copy_page: CMAP2 busy"); 3429 sched_pin(); 3430 PT_SET_MA(sysmaps->CADDR1, PG_V | xpmap_ptom(VM_PAGE_TO_PHYS(src)) | PG_A); 3431 PT_SET_MA(sysmaps->CADDR2, PG_V | PG_RW | xpmap_ptom(VM_PAGE_TO_PHYS(dst)) | PG_A | PG_M); 3432 bcopy(sysmaps->CADDR1, sysmaps->CADDR2, PAGE_SIZE); 3433 PT_SET_MA(sysmaps->CADDR1, 0); 3434 PT_SET_MA(sysmaps->CADDR2, 0); 3435 sched_unpin(); 3436 mtx_unlock(&sysmaps->lock); 3437} 3438 3439/* 3440 * Returns true if the pmap's pv is one of the first 3441 * 16 pvs linked to from this page. This count may 3442 * be changed upwards or downwards in the future; it 3443 * is only necessary that true be returned for a small 3444 * subset of pmaps for proper page aging. 3445 */ 3446boolean_t 3447pmap_page_exists_quick(pmap_t pmap, vm_page_t m) 3448{ 3449 pv_entry_t pv; 3450 int loops = 0; 3451 boolean_t rv; 3452 3453 KASSERT((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0, 3454 ("pmap_page_exists_quick: page %p is not managed", m)); 3455 rv = FALSE; 3456 vm_page_lock_queues(); 3457 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 3458 if (PV_PMAP(pv) == pmap) { 3459 rv = TRUE; 3460 break; 3461 } 3462 loops++; 3463 if (loops >= 16) 3464 break; 3465 } 3466 vm_page_unlock_queues(); 3467 return (rv); 3468} 3469 3470/* 3471 * pmap_page_wired_mappings: 3472 * 3473 * Return the number of managed mappings to the given physical page 3474 * that are wired. 3475 */ 3476int 3477pmap_page_wired_mappings(vm_page_t m) 3478{ 3479 pv_entry_t pv; 3480 pt_entry_t *pte; 3481 pmap_t pmap; 3482 int count; 3483 3484 count = 0; 3485 if ((m->flags & PG_FICTITIOUS) != 0) 3486 return (count); 3487 vm_page_lock_queues(); 3488 sched_pin(); 3489 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 3490 pmap = PV_PMAP(pv); 3491 PMAP_LOCK(pmap); 3492 pte = pmap_pte_quick(pmap, pv->pv_va); 3493 if ((*pte & PG_W) != 0) 3494 count++; 3495 PMAP_UNLOCK(pmap); 3496 } 3497 sched_unpin(); 3498 vm_page_unlock_queues(); 3499 return (count); 3500} 3501 3502/* 3503 * Returns TRUE if the given page is mapped individually or as part of 3504 * a 4mpage. Otherwise, returns FALSE. 3505 */ 3506boolean_t 3507pmap_page_is_mapped(vm_page_t m) 3508{ 3509 boolean_t rv; 3510 3511 if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) != 0) 3512 return (FALSE); 3513 vm_page_lock_queues(); 3514 rv = !TAILQ_EMPTY(&m->md.pv_list) || 3515 !TAILQ_EMPTY(&pa_to_pvh(VM_PAGE_TO_PHYS(m))->pv_list); 3516 vm_page_unlock_queues(); 3517 return (rv); 3518} 3519 3520/* 3521 * Remove all pages from specified address space 3522 * this aids process exit speeds. Also, this code 3523 * is special cased for current process only, but 3524 * can have the more generic (and slightly slower) 3525 * mode enabled. This is much faster than pmap_remove 3526 * in the case of running down an entire address space. 3527 */ 3528void 3529pmap_remove_pages(pmap_t pmap) 3530{ 3531 pt_entry_t *pte, tpte; 3532 vm_page_t m, free = NULL; 3533 pv_entry_t pv; 3534 struct pv_chunk *pc, *npc; 3535 int field, idx; 3536 int32_t bit; 3537 uint32_t inuse, bitmask; 3538 int allfree; 3539 3540 CTR1(KTR_PMAP, "pmap_remove_pages: pmap=%p", pmap); 3541 3542 if (pmap != vmspace_pmap(curthread->td_proc->p_vmspace)) { 3543 printf("warning: pmap_remove_pages called with non-current pmap\n"); 3544 return; 3545 } 3546 vm_page_lock_queues(); 3547 KASSERT(pmap_is_current(pmap), ("removing pages from non-current pmap")); 3548 PMAP_LOCK(pmap); 3549 sched_pin(); 3550 TAILQ_FOREACH_SAFE(pc, &pmap->pm_pvchunk, pc_list, npc) { 3551 allfree = 1; 3552 for (field = 0; field < _NPCM; field++) { 3553 inuse = (~(pc->pc_map[field])) & pc_freemask[field]; 3554 while (inuse != 0) { 3555 bit = bsfl(inuse); 3556 bitmask = 1UL << bit; 3557 idx = field * 32 + bit; 3558 pv = &pc->pc_pventry[idx]; 3559 inuse &= ~bitmask; 3560 3561 pte = vtopte(pv->pv_va); 3562 tpte = *pte ? xpmap_mtop(*pte) : 0; 3563 3564 if (tpte == 0) { 3565 printf( 3566 "TPTE at %p IS ZERO @ VA %08x\n", 3567 pte, pv->pv_va); 3568 panic("bad pte"); 3569 } 3570 3571/* 3572 * We cannot remove wired pages from a process' mapping at this time 3573 */ 3574 if (tpte & PG_W) { 3575 allfree = 0; 3576 continue; 3577 } 3578 3579 m = PHYS_TO_VM_PAGE(tpte & PG_FRAME); 3580 KASSERT(m->phys_addr == (tpte & PG_FRAME), 3581 ("vm_page_t %p phys_addr mismatch %016jx %016jx", 3582 m, (uintmax_t)m->phys_addr, 3583 (uintmax_t)tpte)); 3584 3585 KASSERT(m < &vm_page_array[vm_page_array_size], 3586 ("pmap_remove_pages: bad tpte %#jx", 3587 (uintmax_t)tpte)); 3588 3589 3590 PT_CLEAR_VA(pte, FALSE); 3591 3592 /* 3593 * Update the vm_page_t clean/reference bits. 3594 */ 3595 if (tpte & PG_M) 3596 vm_page_dirty(m); 3597 3598 TAILQ_REMOVE(&m->md.pv_list, pv, pv_list); 3599 if (TAILQ_EMPTY(&m->md.pv_list)) 3600 vm_page_flag_clear(m, PG_WRITEABLE); 3601 3602 pmap_unuse_pt(pmap, pv->pv_va, &free); 3603 3604 /* Mark free */ 3605 PV_STAT(pv_entry_frees++); 3606 PV_STAT(pv_entry_spare++); 3607 pv_entry_count--; 3608 pc->pc_map[field] |= bitmask; 3609 pmap->pm_stats.resident_count--; 3610 } 3611 } 3612 PT_UPDATES_FLUSH(); 3613 if (allfree) { 3614 PV_STAT(pv_entry_spare -= _NPCPV); 3615 PV_STAT(pc_chunk_count--); 3616 PV_STAT(pc_chunk_frees++); 3617 TAILQ_REMOVE(&pmap->pm_pvchunk, pc, pc_list); 3618 m = PHYS_TO_VM_PAGE(pmap_kextract((vm_offset_t)pc)); 3619 pmap_qremove((vm_offset_t)pc, 1); 3620 vm_page_unwire(m, 0); 3621 vm_page_free(m); 3622 pmap_ptelist_free(&pv_vafree, (vm_offset_t)pc); 3623 } 3624 } 3625 PT_UPDATES_FLUSH(); 3626 if (*PMAP1) 3627 PT_SET_MA(PADDR1, 0); 3628 3629 sched_unpin(); 3630 pmap_invalidate_all(pmap); 3631 vm_page_unlock_queues(); 3632 PMAP_UNLOCK(pmap); 3633 pmap_free_zero_pages(free); 3634} 3635 3636/* 3637 * pmap_is_modified: 3638 * 3639 * Return whether or not the specified physical page was modified 3640 * in any physical maps. 3641 */ 3642boolean_t 3643pmap_is_modified(vm_page_t m) 3644{ 3645 pv_entry_t pv; 3646 pt_entry_t *pte; 3647 pmap_t pmap; 3648 boolean_t rv; 3649 3650 KASSERT((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0, 3651 ("pmap_is_modified: page %p is not managed", m)); 3652 rv = FALSE; 3653 3654 /* 3655 * If the page is not VPO_BUSY, then PG_WRITEABLE cannot be 3656 * concurrently set while the object is locked. Thus, if PG_WRITEABLE 3657 * is clear, no PTEs can have PG_M set. 3658 */ 3659 VM_OBJECT_LOCK_ASSERT(m->object, MA_OWNED); 3660 if ((m->oflags & VPO_BUSY) == 0 && 3661 (m->flags & PG_WRITEABLE) == 0) 3662 return (rv); 3663 vm_page_lock_queues(); 3664 sched_pin(); 3665 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 3666 pmap = PV_PMAP(pv); 3667 PMAP_LOCK(pmap); 3668 pte = pmap_pte_quick(pmap, pv->pv_va); 3669 rv = (*pte & PG_M) != 0; 3670 PMAP_UNLOCK(pmap); 3671 if (rv) 3672 break; 3673 } 3674 if (*PMAP1) 3675 PT_SET_MA(PADDR1, 0); 3676 sched_unpin(); 3677 vm_page_unlock_queues(); 3678 return (rv); 3679} 3680 3681/* 3682 * pmap_is_prefaultable: 3683 * 3684 * Return whether or not the specified virtual address is elgible 3685 * for prefault. 3686 */ 3687static boolean_t 3688pmap_is_prefaultable_locked(pmap_t pmap, vm_offset_t addr) 3689{ 3690 pt_entry_t *pte; 3691 boolean_t rv = FALSE; 3692 3693 return (rv); 3694 3695 if (pmap_is_current(pmap) && *pmap_pde(pmap, addr)) { 3696 pte = vtopte(addr); 3697 rv = (*pte == 0); 3698 } 3699 return (rv); 3700} 3701 3702boolean_t 3703pmap_is_prefaultable(pmap_t pmap, vm_offset_t addr) 3704{ 3705 boolean_t rv; 3706 3707 PMAP_LOCK(pmap); 3708 rv = pmap_is_prefaultable_locked(pmap, addr); 3709 PMAP_UNLOCK(pmap); 3710 return (rv); 3711} 3712 3713boolean_t 3714pmap_is_referenced(vm_page_t m) 3715{ 3716 pv_entry_t pv; 3717 pt_entry_t *pte; 3718 pmap_t pmap; 3719 boolean_t rv; 3720 3721 KASSERT((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0, 3722 ("pmap_is_referenced: page %p is not managed", m)); 3723 rv = FALSE; 3724 vm_page_lock_queues(); 3725 sched_pin(); 3726 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 3727 pmap = PV_PMAP(pv); 3728 PMAP_LOCK(pmap); 3729 pte = pmap_pte_quick(pmap, pv->pv_va); 3730 rv = (*pte & (PG_A | PG_V)) == (PG_A | PG_V); 3731 PMAP_UNLOCK(pmap); 3732 if (rv) 3733 break; 3734 } 3735 if (*PMAP1) 3736 PT_SET_MA(PADDR1, 0); 3737 sched_unpin(); 3738 vm_page_unlock_queues(); 3739 return (rv); 3740} 3741 3742void 3743pmap_map_readonly(pmap_t pmap, vm_offset_t va, int len) 3744{ 3745 int i, npages = round_page(len) >> PAGE_SHIFT; 3746 for (i = 0; i < npages; i++) { 3747 pt_entry_t *pte; 3748 pte = pmap_pte(pmap, (vm_offset_t)(va + i*PAGE_SIZE)); 3749 pte_store(pte, xpmap_mtop(*pte & ~(PG_RW|PG_M))); 3750 PMAP_MARK_PRIV(xpmap_mtop(*pte)); 3751 pmap_pte_release(pte); 3752 } 3753} 3754 3755void 3756pmap_map_readwrite(pmap_t pmap, vm_offset_t va, int len) 3757{ 3758 int i, npages = round_page(len) >> PAGE_SHIFT; 3759 for (i = 0; i < npages; i++) { 3760 pt_entry_t *pte; 3761 pte = pmap_pte(pmap, (vm_offset_t)(va + i*PAGE_SIZE)); 3762 PMAP_MARK_UNPRIV(xpmap_mtop(*pte)); 3763 pte_store(pte, xpmap_mtop(*pte) | (PG_RW|PG_M)); 3764 pmap_pte_release(pte); 3765 } 3766} 3767 3768/* 3769 * Clear the write and modified bits in each of the given page's mappings. 3770 */ 3771void 3772pmap_remove_write(vm_page_t m) 3773{ 3774 pv_entry_t pv; 3775 pmap_t pmap; 3776 pt_entry_t oldpte, *pte; 3777 3778 KASSERT((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0, 3779 ("pmap_remove_write: page %p is not managed", m)); 3780 3781 /* 3782 * If the page is not VPO_BUSY, then PG_WRITEABLE cannot be set by 3783 * another thread while the object is locked. Thus, if PG_WRITEABLE 3784 * is clear, no page table entries need updating. 3785 */ 3786 VM_OBJECT_LOCK_ASSERT(m->object, MA_OWNED); 3787 if ((m->oflags & VPO_BUSY) == 0 && 3788 (m->flags & PG_WRITEABLE) == 0) 3789 return; 3790 vm_page_lock_queues(); 3791 sched_pin(); 3792 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 3793 pmap = PV_PMAP(pv); 3794 PMAP_LOCK(pmap); 3795 pte = pmap_pte_quick(pmap, pv->pv_va); 3796retry: 3797 oldpte = *pte; 3798 if ((oldpte & PG_RW) != 0) { 3799 vm_paddr_t newpte = oldpte & ~(PG_RW | PG_M); 3800 3801 /* 3802 * Regardless of whether a pte is 32 or 64 bits 3803 * in size, PG_RW and PG_M are among the least 3804 * significant 32 bits. 3805 */ 3806 PT_SET_VA_MA(pte, newpte, TRUE); 3807 if (*pte != newpte) 3808 goto retry; 3809 3810 if ((oldpte & PG_M) != 0) 3811 vm_page_dirty(m); 3812 pmap_invalidate_page(pmap, pv->pv_va); 3813 } 3814 PMAP_UNLOCK(pmap); 3815 } 3816 vm_page_flag_clear(m, PG_WRITEABLE); 3817 PT_UPDATES_FLUSH(); 3818 if (*PMAP1) 3819 PT_SET_MA(PADDR1, 0); 3820 sched_unpin(); 3821 vm_page_unlock_queues(); 3822} 3823 3824/* 3825 * pmap_ts_referenced: 3826 * 3827 * Return a count of reference bits for a page, clearing those bits. 3828 * It is not necessary for every reference bit to be cleared, but it 3829 * is necessary that 0 only be returned when there are truly no 3830 * reference bits set. 3831 * 3832 * XXX: The exact number of bits to check and clear is a matter that 3833 * should be tested and standardized at some point in the future for 3834 * optimal aging of shared pages. 3835 */ 3836int 3837pmap_ts_referenced(vm_page_t m) 3838{ 3839 pv_entry_t pv, pvf, pvn; 3840 pmap_t pmap; 3841 pt_entry_t *pte; 3842 int rtval = 0; 3843 3844 KASSERT((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0, 3845 ("pmap_ts_referenced: page %p is not managed", m)); 3846 vm_page_lock_queues(); 3847 sched_pin(); 3848 if ((pv = TAILQ_FIRST(&m->md.pv_list)) != NULL) { 3849 pvf = pv; 3850 do { 3851 pvn = TAILQ_NEXT(pv, pv_list); 3852 TAILQ_REMOVE(&m->md.pv_list, pv, pv_list); 3853 TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list); 3854 pmap = PV_PMAP(pv); 3855 PMAP_LOCK(pmap); 3856 pte = pmap_pte_quick(pmap, pv->pv_va); 3857 if ((*pte & PG_A) != 0) { 3858 PT_SET_VA_MA(pte, *pte & ~PG_A, FALSE); 3859 pmap_invalidate_page(pmap, pv->pv_va); 3860 rtval++; 3861 if (rtval > 4) 3862 pvn = NULL; 3863 } 3864 PMAP_UNLOCK(pmap); 3865 } while ((pv = pvn) != NULL && pv != pvf); 3866 } 3867 PT_UPDATES_FLUSH(); 3868 if (*PMAP1) 3869 PT_SET_MA(PADDR1, 0); 3870 3871 sched_unpin(); 3872 vm_page_unlock_queues(); 3873 return (rtval); 3874} 3875 3876/* 3877 * Clear the modify bits on the specified physical page. 3878 */ 3879void 3880pmap_clear_modify(vm_page_t m) 3881{ 3882 pv_entry_t pv; 3883 pmap_t pmap; 3884 pt_entry_t *pte; 3885 3886 KASSERT((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0, 3887 ("pmap_clear_modify: page %p is not managed", m)); 3888 VM_OBJECT_LOCK_ASSERT(m->object, MA_OWNED); 3889 KASSERT((m->oflags & VPO_BUSY) == 0, 3890 ("pmap_clear_modify: page %p is busy", m)); 3891 3892 /* 3893 * If the page is not PG_WRITEABLE, then no PTEs can have PG_M set. 3894 * If the object containing the page is locked and the page is not 3895 * VPO_BUSY, then PG_WRITEABLE cannot be concurrently set. 3896 */ 3897 if ((m->flags & PG_WRITEABLE) == 0) 3898 return; 3899 vm_page_lock_queues(); 3900 sched_pin(); 3901 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 3902 pmap = PV_PMAP(pv); 3903 PMAP_LOCK(pmap); 3904 pte = pmap_pte_quick(pmap, pv->pv_va); 3905 if ((*pte & PG_M) != 0) { 3906 /* 3907 * Regardless of whether a pte is 32 or 64 bits 3908 * in size, PG_M is among the least significant 3909 * 32 bits. 3910 */ 3911 PT_SET_VA_MA(pte, *pte & ~PG_M, FALSE); 3912 pmap_invalidate_page(pmap, pv->pv_va); 3913 } 3914 PMAP_UNLOCK(pmap); 3915 } 3916 sched_unpin(); 3917 vm_page_unlock_queues(); 3918} 3919 3920/* 3921 * pmap_clear_reference: 3922 * 3923 * Clear the reference bit on the specified physical page. 3924 */ 3925void 3926pmap_clear_reference(vm_page_t m) 3927{ 3928 pv_entry_t pv; 3929 pmap_t pmap; 3930 pt_entry_t *pte; 3931 3932 KASSERT((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0, 3933 ("pmap_clear_reference: page %p is not managed", m)); 3934 vm_page_lock_queues(); 3935 sched_pin(); 3936 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 3937 pmap = PV_PMAP(pv); 3938 PMAP_LOCK(pmap); 3939 pte = pmap_pte_quick(pmap, pv->pv_va); 3940 if ((*pte & PG_A) != 0) { 3941 /* 3942 * Regardless of whether a pte is 32 or 64 bits 3943 * in size, PG_A is among the least significant 3944 * 32 bits. 3945 */ 3946 PT_SET_VA_MA(pte, *pte & ~PG_A, FALSE); 3947 pmap_invalidate_page(pmap, pv->pv_va); 3948 } 3949 PMAP_UNLOCK(pmap); 3950 } 3951 sched_unpin(); 3952 vm_page_unlock_queues(); 3953} 3954 3955/* 3956 * Miscellaneous support routines follow 3957 */ 3958 3959/* 3960 * Map a set of physical memory pages into the kernel virtual 3961 * address space. Return a pointer to where it is mapped. This 3962 * routine is intended to be used for mapping device memory, 3963 * NOT real memory. 3964 */ 3965void * 3966pmap_mapdev_attr(vm_paddr_t pa, vm_size_t size, int mode) 3967{ 3968 vm_offset_t va, offset; 3969 vm_size_t tmpsize; 3970 3971 offset = pa & PAGE_MASK; 3972 size = roundup(offset + size, PAGE_SIZE); 3973 pa = pa & PG_FRAME; 3974 3975 if (pa < KERNLOAD && pa + size <= KERNLOAD) 3976 va = KERNBASE + pa; 3977 else 3978 va = kmem_alloc_nofault(kernel_map, size); 3979 if (!va) 3980 panic("pmap_mapdev: Couldn't alloc kernel virtual memory"); 3981 3982 for (tmpsize = 0; tmpsize < size; tmpsize += PAGE_SIZE) 3983 pmap_kenter_attr(va + tmpsize, pa + tmpsize, mode); 3984 pmap_invalidate_range(kernel_pmap, va, va + tmpsize); 3985 pmap_invalidate_cache_range(va, va + size); 3986 return ((void *)(va + offset)); 3987} 3988 3989void * 3990pmap_mapdev(vm_paddr_t pa, vm_size_t size) 3991{ 3992 3993 return (pmap_mapdev_attr(pa, size, PAT_UNCACHEABLE)); 3994} 3995 3996void * 3997pmap_mapbios(vm_paddr_t pa, vm_size_t size) 3998{ 3999 4000 return (pmap_mapdev_attr(pa, size, PAT_WRITE_BACK)); 4001} 4002 4003void 4004pmap_unmapdev(vm_offset_t va, vm_size_t size) 4005{ 4006 vm_offset_t base, offset, tmpva; 4007 4008 if (va >= KERNBASE && va + size <= KERNBASE + KERNLOAD) 4009 return; 4010 base = trunc_page(va); 4011 offset = va & PAGE_MASK; 4012 size = roundup(offset + size, PAGE_SIZE); 4013 critical_enter(); 4014 for (tmpva = base; tmpva < (base + size); tmpva += PAGE_SIZE) 4015 pmap_kremove(tmpva); 4016 pmap_invalidate_range(kernel_pmap, va, tmpva); 4017 critical_exit(); 4018 kmem_free(kernel_map, base, size); 4019} 4020 4021/* 4022 * Sets the memory attribute for the specified page. 4023 */ 4024void 4025pmap_page_set_memattr(vm_page_t m, vm_memattr_t ma) 4026{ 4027 struct sysmaps *sysmaps; 4028 vm_offset_t sva, eva; 4029 4030 m->md.pat_mode = ma; 4031 if ((m->flags & PG_FICTITIOUS) != 0) 4032 return; 4033 4034 /* 4035 * If "m" is a normal page, flush it from the cache. 4036 * See pmap_invalidate_cache_range(). 4037 * 4038 * First, try to find an existing mapping of the page by sf 4039 * buffer. sf_buf_invalidate_cache() modifies mapping and 4040 * flushes the cache. 4041 */ 4042 if (sf_buf_invalidate_cache(m)) 4043 return; 4044 4045 /* 4046 * If page is not mapped by sf buffer, but CPU does not 4047 * support self snoop, map the page transient and do 4048 * invalidation. In the worst case, whole cache is flushed by 4049 * pmap_invalidate_cache_range(). 4050 */ 4051 if ((cpu_feature & (CPUID_SS|CPUID_CLFSH)) == CPUID_CLFSH) { 4052 sysmaps = &sysmaps_pcpu[PCPU_GET(cpuid)]; 4053 mtx_lock(&sysmaps->lock); 4054 if (*sysmaps->CMAP2) 4055 panic("pmap_page_set_memattr: CMAP2 busy"); 4056 sched_pin(); 4057 PT_SET_MA(sysmaps->CADDR2, PG_V | PG_RW | 4058 xpmap_ptom(VM_PAGE_TO_PHYS(m)) | PG_A | PG_M | 4059 pmap_cache_bits(m->md.pat_mode, 0)); 4060 invlcaddr(sysmaps->CADDR2); 4061 sva = (vm_offset_t)sysmaps->CADDR2; 4062 eva = sva + PAGE_SIZE; 4063 } else 4064 sva = eva = 0; /* gcc */ 4065 pmap_invalidate_cache_range(sva, eva); 4066 if (sva != 0) { 4067 PT_SET_MA(sysmaps->CADDR2, 0); 4068 sched_unpin(); 4069 mtx_unlock(&sysmaps->lock); 4070 } 4071} 4072 4073int 4074pmap_change_attr(va, size, mode) 4075 vm_offset_t va; 4076 vm_size_t size; 4077 int mode; 4078{ 4079 vm_offset_t base, offset, tmpva; 4080 pt_entry_t *pte; 4081 u_int opte, npte; 4082 pd_entry_t *pde; 4083 boolean_t changed; 4084 4085 base = trunc_page(va); 4086 offset = va & PAGE_MASK; 4087 size = roundup(offset + size, PAGE_SIZE); 4088 4089 /* Only supported on kernel virtual addresses. */ 4090 if (base <= VM_MAXUSER_ADDRESS) 4091 return (EINVAL); 4092 4093 /* 4MB pages and pages that aren't mapped aren't supported. */ 4094 for (tmpva = base; tmpva < (base + size); tmpva += PAGE_SIZE) { 4095 pde = pmap_pde(kernel_pmap, tmpva); 4096 if (*pde & PG_PS) 4097 return (EINVAL); 4098 if ((*pde & PG_V) == 0) 4099 return (EINVAL); 4100 pte = vtopte(va); 4101 if ((*pte & PG_V) == 0) 4102 return (EINVAL); 4103 } 4104 4105 changed = FALSE; 4106 4107 /* 4108 * Ok, all the pages exist and are 4k, so run through them updating 4109 * their cache mode. 4110 */ 4111 for (tmpva = base; size > 0; ) { 4112 pte = vtopte(tmpva); 4113 4114 /* 4115 * The cache mode bits are all in the low 32-bits of the 4116 * PTE, so we can just spin on updating the low 32-bits. 4117 */ 4118 do { 4119 opte = *(u_int *)pte; 4120 npte = opte & ~(PG_PTE_PAT | PG_NC_PCD | PG_NC_PWT); 4121 npte |= pmap_cache_bits(mode, 0); 4122 PT_SET_VA_MA(pte, npte, TRUE); 4123 } while (npte != opte && (*pte != npte)); 4124 if (npte != opte) 4125 changed = TRUE; 4126 tmpva += PAGE_SIZE; 4127 size -= PAGE_SIZE; 4128 } 4129 4130 /* 4131 * Flush CPU caches to make sure any data isn't cached that shouldn't 4132 * be, etc. 4133 */ 4134 if (changed) { 4135 pmap_invalidate_range(kernel_pmap, base, tmpva); 4136 pmap_invalidate_cache_range(base, tmpva); 4137 } 4138 return (0); 4139} 4140 4141/* 4142 * perform the pmap work for mincore 4143 */ 4144int 4145pmap_mincore(pmap_t pmap, vm_offset_t addr, vm_paddr_t *locked_pa) 4146{ 4147 pt_entry_t *ptep, pte; 4148 vm_paddr_t pa; 4149 int val; 4150 4151 PMAP_LOCK(pmap); 4152retry: 4153 ptep = pmap_pte(pmap, addr); 4154 pte = (ptep != NULL) ? PT_GET(ptep) : 0; 4155 pmap_pte_release(ptep); 4156 val = 0; 4157 if ((pte & PG_V) != 0) { 4158 val |= MINCORE_INCORE; 4159 if ((pte & (PG_M | PG_RW)) == (PG_M | PG_RW)) 4160 val |= MINCORE_MODIFIED | MINCORE_MODIFIED_OTHER; 4161 if ((pte & PG_A) != 0) 4162 val |= MINCORE_REFERENCED | MINCORE_REFERENCED_OTHER; 4163 } 4164 if ((val & (MINCORE_MODIFIED_OTHER | MINCORE_REFERENCED_OTHER)) != 4165 (MINCORE_MODIFIED_OTHER | MINCORE_REFERENCED_OTHER) && 4166 (pte & (PG_MANAGED | PG_V)) == (PG_MANAGED | PG_V)) { 4167 pa = pte & PG_FRAME; 4168 /* Ensure that "PHYS_TO_VM_PAGE(pa)->object" doesn't change. */ 4169 if (vm_page_pa_tryrelock(pmap, pa, locked_pa)) 4170 goto retry; 4171 } else 4172 PA_UNLOCK_COND(*locked_pa); 4173 PMAP_UNLOCK(pmap); 4174 return (val); 4175} 4176 4177void 4178pmap_activate(struct thread *td) 4179{ 4180 pmap_t pmap, oldpmap; 4181 u_int32_t cr3; 4182 4183 critical_enter(); 4184 pmap = vmspace_pmap(td->td_proc->p_vmspace); 4185 oldpmap = PCPU_GET(curpmap); 4186#if defined(SMP) 4187 atomic_clear_int(&oldpmap->pm_active, PCPU_GET(cpumask)); 4188 atomic_set_int(&pmap->pm_active, PCPU_GET(cpumask)); 4189#else 4190 oldpmap->pm_active &= ~1; 4191 pmap->pm_active |= 1; 4192#endif 4193#ifdef PAE 4194 cr3 = vtophys(pmap->pm_pdpt); 4195#else 4196 cr3 = vtophys(pmap->pm_pdir); 4197#endif 4198 /* 4199 * pmap_activate is for the current thread on the current cpu 4200 */ 4201 td->td_pcb->pcb_cr3 = cr3; 4202 PT_UPDATES_FLUSH(); 4203 load_cr3(cr3); 4204 PCPU_SET(curpmap, pmap); 4205 critical_exit(); 4206} 4207 4208void 4209pmap_sync_icache(pmap_t pm, vm_offset_t va, vm_size_t sz) 4210{ 4211} 4212 4213/* 4214 * Increase the starting virtual address of the given mapping if a 4215 * different alignment might result in more superpage mappings. 4216 */ 4217void 4218pmap_align_superpage(vm_object_t object, vm_ooffset_t offset, 4219 vm_offset_t *addr, vm_size_t size) 4220{ 4221 vm_offset_t superpage_offset; 4222 4223 if (size < NBPDR) 4224 return; 4225 if (object != NULL && (object->flags & OBJ_COLORED) != 0) 4226 offset += ptoa(object->pg_color); 4227 superpage_offset = offset & PDRMASK; 4228 if (size - ((NBPDR - superpage_offset) & PDRMASK) < NBPDR || 4229 (*addr & PDRMASK) == superpage_offset) 4230 return; 4231 if ((*addr & PDRMASK) < superpage_offset) 4232 *addr = (*addr & ~PDRMASK) + superpage_offset; 4233 else 4234 *addr = ((*addr + PDRMASK) & ~PDRMASK) + superpage_offset; 4235} 4236 4237#ifdef XEN 4238 4239void 4240pmap_suspend() 4241{ 4242 pmap_t pmap; 4243 int i, pdir, offset; 4244 vm_paddr_t pdirma; 4245 mmu_update_t mu[4]; 4246 4247 /* 4248 * We need to remove the recursive mapping structure from all 4249 * our pmaps so that Xen doesn't get confused when it restores 4250 * the page tables. The recursive map lives at page directory 4251 * index PTDPTDI. We assume that the suspend code has stopped 4252 * the other vcpus (if any). 4253 */ 4254 LIST_FOREACH(pmap, &allpmaps, pm_list) { 4255 for (i = 0; i < 4; i++) { 4256 /* 4257 * Figure out which page directory (L2) page 4258 * contains this bit of the recursive map and 4259 * the offset within that page of the map 4260 * entry 4261 */ 4262 pdir = (PTDPTDI + i) / NPDEPG; 4263 offset = (PTDPTDI + i) % NPDEPG; 4264 pdirma = pmap->pm_pdpt[pdir] & PG_FRAME; 4265 mu[i].ptr = pdirma + offset * sizeof(pd_entry_t); 4266 mu[i].val = 0; 4267 } 4268 HYPERVISOR_mmu_update(mu, 4, NULL, DOMID_SELF); 4269 } 4270} 4271 4272void 4273pmap_resume() 4274{ 4275 pmap_t pmap; 4276 int i, pdir, offset; 4277 vm_paddr_t pdirma; 4278 mmu_update_t mu[4]; 4279 4280 /* 4281 * Restore the recursive map that we removed on suspend. 4282 */ 4283 LIST_FOREACH(pmap, &allpmaps, pm_list) { 4284 for (i = 0; i < 4; i++) { 4285 /* 4286 * Figure out which page directory (L2) page 4287 * contains this bit of the recursive map and 4288 * the offset within that page of the map 4289 * entry 4290 */ 4291 pdir = (PTDPTDI + i) / NPDEPG; 4292 offset = (PTDPTDI + i) % NPDEPG; 4293 pdirma = pmap->pm_pdpt[pdir] & PG_FRAME; 4294 mu[i].ptr = pdirma + offset * sizeof(pd_entry_t); 4295 mu[i].val = (pmap->pm_pdpt[i] & PG_FRAME) | PG_V; 4296 } 4297 HYPERVISOR_mmu_update(mu, 4, NULL, DOMID_SELF); 4298 } 4299} 4300 4301#endif 4302 4303#if defined(PMAP_DEBUG) 4304pmap_pid_dump(int pid) 4305{ 4306 pmap_t pmap; 4307 struct proc *p; 4308 int npte = 0; 4309 int index; 4310 4311 sx_slock(&allproc_lock); 4312 FOREACH_PROC_IN_SYSTEM(p) { 4313 if (p->p_pid != pid) 4314 continue; 4315 4316 if (p->p_vmspace) { 4317 int i,j; 4318 index = 0; 4319 pmap = vmspace_pmap(p->p_vmspace); 4320 for (i = 0; i < NPDEPTD; i++) { 4321 pd_entry_t *pde; 4322 pt_entry_t *pte; 4323 vm_offset_t base = i << PDRSHIFT; 4324 4325 pde = &pmap->pm_pdir[i]; 4326 if (pde && pmap_pde_v(pde)) { 4327 for (j = 0; j < NPTEPG; j++) { 4328 vm_offset_t va = base + (j << PAGE_SHIFT); 4329 if (va >= (vm_offset_t) VM_MIN_KERNEL_ADDRESS) { 4330 if (index) { 4331 index = 0; 4332 printf("\n"); 4333 } 4334 sx_sunlock(&allproc_lock); 4335 return npte; 4336 } 4337 pte = pmap_pte(pmap, va); 4338 if (pte && pmap_pte_v(pte)) { 4339 pt_entry_t pa; 4340 vm_page_t m; 4341 pa = PT_GET(pte); 4342 m = PHYS_TO_VM_PAGE(pa & PG_FRAME); 4343 printf("va: 0x%x, pt: 0x%x, h: %d, w: %d, f: 0x%x", 4344 va, pa, m->hold_count, m->wire_count, m->flags); 4345 npte++; 4346 index++; 4347 if (index >= 2) { 4348 index = 0; 4349 printf("\n"); 4350 } else { 4351 printf(" "); 4352 } 4353 } 4354 } 4355 } 4356 } 4357 } 4358 } 4359 sx_sunlock(&allproc_lock); 4360 return npte; 4361} 4362#endif 4363 4364#if defined(DEBUG) 4365 4366static void pads(pmap_t pm); 4367void pmap_pvdump(vm_paddr_t pa); 4368 4369/* print address space of pmap*/ 4370static void 4371pads(pmap_t pm) 4372{ 4373 int i, j; 4374 vm_paddr_t va; 4375 pt_entry_t *ptep; 4376 4377 if (pm == kernel_pmap) 4378 return; 4379 for (i = 0; i < NPDEPTD; i++) 4380 if (pm->pm_pdir[i]) 4381 for (j = 0; j < NPTEPG; j++) { 4382 va = (i << PDRSHIFT) + (j << PAGE_SHIFT); 4383 if (pm == kernel_pmap && va < KERNBASE) 4384 continue; 4385 if (pm != kernel_pmap && va > UPT_MAX_ADDRESS) 4386 continue; 4387 ptep = pmap_pte(pm, va); 4388 if (pmap_pte_v(ptep)) 4389 printf("%x:%x ", va, *ptep); 4390 }; 4391 4392} 4393 4394void 4395pmap_pvdump(vm_paddr_t pa) 4396{ 4397 pv_entry_t pv; 4398 pmap_t pmap; 4399 vm_page_t m; 4400 4401 printf("pa %x", pa); 4402 m = PHYS_TO_VM_PAGE(pa); 4403 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 4404 pmap = PV_PMAP(pv); 4405 printf(" -> pmap %p, va %x", (void *)pmap, pv->pv_va); 4406 pads(pmap); 4407 } 4408 printf(" "); 4409} 4410#endif 4411