pmap.c revision 152238
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/i386/pmap.c 152238 2005-11-09 12:22:26Z nyan $"); 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#ifndef PC98 110#include "opt_xbox.h" 111#endif 112 113#include <sys/param.h> 114#include <sys/systm.h> 115#include <sys/kernel.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/sx.h> 123#include <sys/vmmeter.h> 124#include <sys/sched.h> 125#include <sys/sysctl.h> 126#ifdef SMP 127#include <sys/smp.h> 128#endif 129 130#include <vm/vm.h> 131#include <vm/vm_param.h> 132#include <vm/vm_kern.h> 133#include <vm/vm_page.h> 134#include <vm/vm_map.h> 135#include <vm/vm_object.h> 136#include <vm/vm_extern.h> 137#include <vm/vm_pageout.h> 138#include <vm/vm_pager.h> 139#include <vm/uma.h> 140 141#include <machine/cpu.h> 142#include <machine/cputypes.h> 143#include <machine/md_var.h> 144#include <machine/pcb.h> 145#include <machine/specialreg.h> 146#ifdef SMP 147#include <machine/smp.h> 148#endif 149 150#ifdef XBOX 151#include <machine/xbox.h> 152#endif 153 154#if !defined(CPU_DISABLE_SSE) && defined(I686_CPU) 155#define CPU_ENABLE_SSE 156#endif 157 158#ifndef PMAP_SHPGPERPROC 159#define PMAP_SHPGPERPROC 200 160#endif 161 162#if defined(DIAGNOSTIC) 163#define PMAP_DIAGNOSTIC 164#endif 165 166#if !defined(PMAP_DIAGNOSTIC) 167#define PMAP_INLINE __inline 168#else 169#define PMAP_INLINE 170#endif 171 172/* 173 * Get PDEs and PTEs for user/kernel address space 174 */ 175#define pmap_pde(m, v) (&((m)->pm_pdir[(vm_offset_t)(v) >> PDRSHIFT])) 176#define pdir_pde(m, v) (m[(vm_offset_t)(v) >> PDRSHIFT]) 177 178#define pmap_pde_v(pte) ((*(int *)pte & PG_V) != 0) 179#define pmap_pte_w(pte) ((*(int *)pte & PG_W) != 0) 180#define pmap_pte_m(pte) ((*(int *)pte & PG_M) != 0) 181#define pmap_pte_u(pte) ((*(int *)pte & PG_A) != 0) 182#define pmap_pte_v(pte) ((*(int *)pte & PG_V) != 0) 183 184#define pmap_pte_set_w(pte, v) ((v) ? atomic_set_int((u_int *)(pte), PG_W) : \ 185 atomic_clear_int((u_int *)(pte), PG_W)) 186#define pmap_pte_set_prot(pte, v) ((*(int *)pte &= ~PG_PROT), (*(int *)pte |= (v))) 187 188struct pmap kernel_pmap_store; 189LIST_HEAD(pmaplist, pmap); 190static struct pmaplist allpmaps; 191static struct mtx allpmaps_lock; 192 193vm_paddr_t avail_end; /* PA of last available physical page */ 194vm_offset_t virtual_avail; /* VA of first avail page (after kernel bss) */ 195vm_offset_t virtual_end; /* VA of last avail page (end of kernel AS) */ 196int pgeflag = 0; /* PG_G or-in */ 197int pseflag = 0; /* PG_PS or-in */ 198 199static int nkpt; 200vm_offset_t kernel_vm_end; 201extern u_int32_t KERNend; 202 203#ifdef PAE 204static uma_zone_t pdptzone; 205#endif 206 207/* 208 * Data for the pv entry allocation mechanism 209 */ 210static uma_zone_t pvzone; 211static struct vm_object pvzone_obj; 212static int pv_entry_count = 0, pv_entry_max = 0, pv_entry_high_water = 0; 213 214/* 215 * All those kernel PT submaps that BSD is so fond of 216 */ 217struct sysmaps { 218 struct mtx lock; 219 pt_entry_t *CMAP1; 220 pt_entry_t *CMAP2; 221 caddr_t CADDR1; 222 caddr_t CADDR2; 223}; 224static struct sysmaps sysmaps_pcpu[MAXCPU]; 225pt_entry_t *CMAP1 = 0; 226static pt_entry_t *CMAP3; 227caddr_t CADDR1 = 0, ptvmmap = 0; 228static caddr_t CADDR3; 229struct msgbuf *msgbufp = 0; 230 231/* 232 * Crashdump maps. 233 */ 234static caddr_t crashdumpmap; 235 236#ifdef SMP 237extern pt_entry_t *SMPpt; 238#endif 239static pt_entry_t *PMAP1 = 0, *PMAP2; 240static pt_entry_t *PADDR1 = 0, *PADDR2; 241#ifdef SMP 242static int PMAP1cpu; 243static int PMAP1changedcpu; 244SYSCTL_INT(_debug, OID_AUTO, PMAP1changedcpu, CTLFLAG_RD, 245 &PMAP1changedcpu, 0, 246 "Number of times pmap_pte_quick changed CPU with same PMAP1"); 247#endif 248static int PMAP1changed; 249SYSCTL_INT(_debug, OID_AUTO, PMAP1changed, CTLFLAG_RD, 250 &PMAP1changed, 0, 251 "Number of times pmap_pte_quick changed PMAP1"); 252static int PMAP1unchanged; 253SYSCTL_INT(_debug, OID_AUTO, PMAP1unchanged, CTLFLAG_RD, 254 &PMAP1unchanged, 0, 255 "Number of times pmap_pte_quick didn't change PMAP1"); 256static struct mtx PMAP2mutex; 257 258static PMAP_INLINE void free_pv_entry(pv_entry_t pv); 259static pv_entry_t get_pv_entry(pmap_t locked_pmap); 260static void pmap_clear_ptes(vm_page_t m, int bit); 261 262static int pmap_remove_pte(pmap_t pmap, pt_entry_t *ptq, vm_offset_t sva); 263static void pmap_remove_page(struct pmap *pmap, vm_offset_t va); 264static void pmap_remove_entry(struct pmap *pmap, vm_page_t m, 265 vm_offset_t va); 266static void pmap_insert_entry(pmap_t pmap, vm_offset_t va, vm_page_t m); 267 268static vm_page_t pmap_allocpte(pmap_t pmap, vm_offset_t va, int flags); 269 270static vm_page_t _pmap_allocpte(pmap_t pmap, unsigned ptepindex, int flags); 271static int _pmap_unwire_pte_hold(pmap_t pmap, vm_page_t m); 272static pt_entry_t *pmap_pte_quick(pmap_t pmap, vm_offset_t va); 273static void pmap_pte_release(pt_entry_t *pte); 274static int pmap_unuse_pt(pmap_t, vm_offset_t); 275static vm_offset_t pmap_kmem_choose(vm_offset_t addr); 276#ifdef PAE 277static void *pmap_pdpt_allocf(uma_zone_t zone, int bytes, u_int8_t *flags, int wait); 278#endif 279 280CTASSERT(1 << PDESHIFT == sizeof(pd_entry_t)); 281CTASSERT(1 << PTESHIFT == sizeof(pt_entry_t)); 282 283/* 284 * Move the kernel virtual free pointer to the next 285 * 4MB. This is used to help improve performance 286 * by using a large (4MB) page for much of the kernel 287 * (.text, .data, .bss) 288 */ 289static vm_offset_t 290pmap_kmem_choose(vm_offset_t addr) 291{ 292 vm_offset_t newaddr = addr; 293 294#ifndef DISABLE_PSE 295 if (cpu_feature & CPUID_PSE) 296 newaddr = (addr + PDRMASK) & ~PDRMASK; 297#endif 298 return newaddr; 299} 300 301/* 302 * Bootstrap the system enough to run with virtual memory. 303 * 304 * On the i386 this is called after mapping has already been enabled 305 * and just syncs the pmap module with what has already been done. 306 * [We can't call it easily with mapping off since the kernel is not 307 * mapped with PA == VA, hence we would have to relocate every address 308 * from the linked base (virtual) address "KERNBASE" to the actual 309 * (physical) address starting relative to 0] 310 */ 311void 312pmap_bootstrap(firstaddr, loadaddr) 313 vm_paddr_t firstaddr; 314 vm_paddr_t loadaddr; 315{ 316 vm_offset_t va; 317 pt_entry_t *pte, *unused; 318 struct sysmaps *sysmaps; 319 int i; 320 321 /* 322 * XXX The calculation of virtual_avail is wrong. It's NKPT*PAGE_SIZE too 323 * large. It should instead be correctly calculated in locore.s and 324 * not based on 'first' (which is a physical address, not a virtual 325 * address, for the start of unused physical memory). The kernel 326 * page tables are NOT double mapped and thus should not be included 327 * in this calculation. 328 */ 329 virtual_avail = (vm_offset_t) KERNBASE + firstaddr; 330 virtual_avail = pmap_kmem_choose(virtual_avail); 331 332 virtual_end = VM_MAX_KERNEL_ADDRESS; 333 334 /* 335 * Initialize the kernel pmap (which is statically allocated). 336 */ 337 PMAP_LOCK_INIT(kernel_pmap); 338 kernel_pmap->pm_pdir = (pd_entry_t *) (KERNBASE + (u_int)IdlePTD); 339#ifdef PAE 340 kernel_pmap->pm_pdpt = (pdpt_entry_t *) (KERNBASE + (u_int)IdlePDPT); 341#endif 342 kernel_pmap->pm_active = -1; /* don't allow deactivation */ 343 TAILQ_INIT(&kernel_pmap->pm_pvlist); 344 LIST_INIT(&allpmaps); 345 mtx_init(&allpmaps_lock, "allpmaps", NULL, MTX_SPIN); 346 mtx_lock_spin(&allpmaps_lock); 347 LIST_INSERT_HEAD(&allpmaps, kernel_pmap, pm_list); 348 mtx_unlock_spin(&allpmaps_lock); 349 nkpt = NKPT; 350 351 /* 352 * Reserve some special page table entries/VA space for temporary 353 * mapping of pages. 354 */ 355#define SYSMAP(c, p, v, n) \ 356 v = (c)va; va += ((n)*PAGE_SIZE); p = pte; pte += (n); 357 358 va = virtual_avail; 359 pte = vtopte(va); 360 361 /* 362 * CMAP1/CMAP2 are used for zeroing and copying pages. 363 * CMAP3 is used for the idle process page zeroing. 364 */ 365 for (i = 0; i < MAXCPU; i++) { 366 sysmaps = &sysmaps_pcpu[i]; 367 mtx_init(&sysmaps->lock, "SYSMAPS", NULL, MTX_DEF); 368 SYSMAP(caddr_t, sysmaps->CMAP1, sysmaps->CADDR1, 1) 369 SYSMAP(caddr_t, sysmaps->CMAP2, sysmaps->CADDR2, 1) 370 } 371 SYSMAP(caddr_t, CMAP1, CADDR1, 1) 372 SYSMAP(caddr_t, CMAP3, CADDR3, 1) 373 *CMAP3 = 0; 374 375 /* 376 * Crashdump maps. 377 */ 378 SYSMAP(caddr_t, unused, crashdumpmap, MAXDUMPPGS) 379 380 /* 381 * ptvmmap is used for reading arbitrary physical pages via /dev/mem. 382 */ 383 SYSMAP(caddr_t, unused, ptvmmap, 1) 384 385 /* 386 * msgbufp is used to map the system message buffer. 387 */ 388 SYSMAP(struct msgbuf *, unused, msgbufp, atop(round_page(MSGBUF_SIZE))) 389 390 /* 391 * ptemap is used for pmap_pte_quick 392 */ 393 SYSMAP(pt_entry_t *, PMAP1, PADDR1, 1); 394 SYSMAP(pt_entry_t *, PMAP2, PADDR2, 1); 395 396 mtx_init(&PMAP2mutex, "PMAP2", NULL, MTX_DEF); 397 398 virtual_avail = va; 399 400 *CMAP1 = 0; 401 402#ifdef XBOX 403 /* FIXME: This is gross, but needed for the XBOX. Since we are in such 404 * an early stadium, we cannot yet neatly map video memory ... :-( 405 * Better fixes are very welcome! */ 406 if (!arch_i386_is_xbox) 407#endif 408 for (i = 0; i < NKPT; i++) 409 PTD[i] = 0; 410 411 /* Turn on PG_G on kernel page(s) */ 412 pmap_set_pg(); 413} 414 415/* 416 * Set PG_G on kernel pages. Only the BSP calls this when SMP is turned on. 417 */ 418void 419pmap_set_pg(void) 420{ 421 pd_entry_t pdir; 422 pt_entry_t *pte; 423 vm_offset_t va, endva; 424 int i; 425 426 if (pgeflag == 0) 427 return; 428 429 i = KERNLOAD/NBPDR; 430 endva = KERNBASE + KERNend; 431 432 if (pseflag) { 433 va = KERNBASE + KERNLOAD; 434 while (va < endva) { 435 pdir = kernel_pmap->pm_pdir[KPTDI+i]; 436 pdir |= pgeflag; 437 kernel_pmap->pm_pdir[KPTDI+i] = PTD[KPTDI+i] = pdir; 438 invltlb(); /* Play it safe, invltlb() every time */ 439 i++; 440 va += NBPDR; 441 } 442 } else { 443 va = (vm_offset_t)btext; 444 while (va < endva) { 445 pte = vtopte(va); 446 if (*pte) 447 *pte |= pgeflag; 448 invltlb(); /* Play it safe, invltlb() every time */ 449 va += PAGE_SIZE; 450 } 451 } 452} 453 454/* 455 * Initialize a vm_page's machine-dependent fields. 456 */ 457void 458pmap_page_init(vm_page_t m) 459{ 460 461 TAILQ_INIT(&m->md.pv_list); 462 m->md.pv_list_count = 0; 463} 464 465#ifdef PAE 466 467static MALLOC_DEFINE(M_PMAPPDPT, "pmap", "pmap pdpt"); 468 469static void * 470pmap_pdpt_allocf(uma_zone_t zone, int bytes, u_int8_t *flags, int wait) 471{ 472 *flags = UMA_SLAB_PRIV; 473 return (contigmalloc(PAGE_SIZE, M_PMAPPDPT, 0, 0x0ULL, 0xffffffffULL, 474 1, 0)); 475} 476#endif 477 478/* 479 * Initialize the pmap module. 480 * Called by vm_init, to initialize any structures that the pmap 481 * system needs to map virtual memory. 482 */ 483void 484pmap_init(void) 485{ 486 int shpgperproc = PMAP_SHPGPERPROC; 487 488 /* 489 * Initialize the address space (zone) for the pv entries. Set a 490 * high water mark so that the system can recover from excessive 491 * numbers of pv entries. 492 */ 493 pvzone = uma_zcreate("PV ENTRY", sizeof(struct pv_entry), NULL, NULL, 494 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_VM | UMA_ZONE_NOFREE); 495 TUNABLE_INT_FETCH("vm.pmap.shpgperproc", &shpgperproc); 496 pv_entry_max = shpgperproc * maxproc + cnt.v_page_count; 497 TUNABLE_INT_FETCH("vm.pmap.pv_entries", &pv_entry_max); 498 pv_entry_high_water = 9 * (pv_entry_max / 10); 499 uma_zone_set_obj(pvzone, &pvzone_obj, pv_entry_max); 500 501#ifdef PAE 502 pdptzone = uma_zcreate("PDPT", NPGPTD * sizeof(pdpt_entry_t), NULL, 503 NULL, NULL, NULL, (NPGPTD * sizeof(pdpt_entry_t)) - 1, 504 UMA_ZONE_VM | UMA_ZONE_NOFREE); 505 uma_zone_set_allocf(pdptzone, pmap_pdpt_allocf); 506#endif 507} 508 509void 510pmap_init2() 511{ 512} 513 514 515/*************************************************** 516 * Low level helper routines..... 517 ***************************************************/ 518 519 520/* 521 * this routine defines the region(s) of memory that should 522 * not be tested for the modified bit. 523 */ 524static PMAP_INLINE int 525pmap_track_modified(vm_offset_t va) 526{ 527 if ((va < kmi.clean_sva) || (va >= kmi.clean_eva)) 528 return 1; 529 else 530 return 0; 531} 532 533#ifdef SMP 534/* 535 * For SMP, these functions have to use the IPI mechanism for coherence. 536 */ 537void 538pmap_invalidate_page(pmap_t pmap, vm_offset_t va) 539{ 540 u_int cpumask; 541 u_int other_cpus; 542 543 if (smp_started) { 544 if (!(read_eflags() & PSL_I)) 545 panic("%s: interrupts disabled", __func__); 546 mtx_lock_spin(&smp_ipi_mtx); 547 } else 548 critical_enter(); 549 /* 550 * We need to disable interrupt preemption but MUST NOT have 551 * interrupts disabled here. 552 * XXX we may need to hold schedlock to get a coherent pm_active 553 * XXX critical sections disable interrupts again 554 */ 555 if (pmap == kernel_pmap || pmap->pm_active == all_cpus) { 556 invlpg(va); 557 smp_invlpg(va); 558 } else { 559 cpumask = PCPU_GET(cpumask); 560 other_cpus = PCPU_GET(other_cpus); 561 if (pmap->pm_active & cpumask) 562 invlpg(va); 563 if (pmap->pm_active & other_cpus) 564 smp_masked_invlpg(pmap->pm_active & other_cpus, va); 565 } 566 if (smp_started) 567 mtx_unlock_spin(&smp_ipi_mtx); 568 else 569 critical_exit(); 570} 571 572void 573pmap_invalidate_range(pmap_t pmap, vm_offset_t sva, vm_offset_t eva) 574{ 575 u_int cpumask; 576 u_int other_cpus; 577 vm_offset_t addr; 578 579 if (smp_started) { 580 if (!(read_eflags() & PSL_I)) 581 panic("%s: interrupts disabled", __func__); 582 mtx_lock_spin(&smp_ipi_mtx); 583 } else 584 critical_enter(); 585 /* 586 * We need to disable interrupt preemption but MUST NOT have 587 * interrupts disabled here. 588 * XXX we may need to hold schedlock to get a coherent pm_active 589 * XXX critical sections disable interrupts again 590 */ 591 if (pmap == kernel_pmap || pmap->pm_active == all_cpus) { 592 for (addr = sva; addr < eva; addr += PAGE_SIZE) 593 invlpg(addr); 594 smp_invlpg_range(sva, eva); 595 } else { 596 cpumask = PCPU_GET(cpumask); 597 other_cpus = PCPU_GET(other_cpus); 598 if (pmap->pm_active & cpumask) 599 for (addr = sva; addr < eva; addr += PAGE_SIZE) 600 invlpg(addr); 601 if (pmap->pm_active & other_cpus) 602 smp_masked_invlpg_range(pmap->pm_active & other_cpus, 603 sva, eva); 604 } 605 if (smp_started) 606 mtx_unlock_spin(&smp_ipi_mtx); 607 else 608 critical_exit(); 609} 610 611void 612pmap_invalidate_all(pmap_t pmap) 613{ 614 u_int cpumask; 615 u_int other_cpus; 616 617 if (smp_started) { 618 if (!(read_eflags() & PSL_I)) 619 panic("%s: interrupts disabled", __func__); 620 mtx_lock_spin(&smp_ipi_mtx); 621 } else 622 critical_enter(); 623 /* 624 * We need to disable interrupt preemption but MUST NOT have 625 * interrupts disabled here. 626 * XXX we may need to hold schedlock to get a coherent pm_active 627 * XXX critical sections disable interrupts again 628 */ 629 if (pmap == kernel_pmap || pmap->pm_active == all_cpus) { 630 invltlb(); 631 smp_invltlb(); 632 } else { 633 cpumask = PCPU_GET(cpumask); 634 other_cpus = PCPU_GET(other_cpus); 635 if (pmap->pm_active & cpumask) 636 invltlb(); 637 if (pmap->pm_active & other_cpus) 638 smp_masked_invltlb(pmap->pm_active & other_cpus); 639 } 640 if (smp_started) 641 mtx_unlock_spin(&smp_ipi_mtx); 642 else 643 critical_exit(); 644} 645#else /* !SMP */ 646/* 647 * Normal, non-SMP, 486+ invalidation functions. 648 * We inline these within pmap.c for speed. 649 */ 650PMAP_INLINE void 651pmap_invalidate_page(pmap_t pmap, vm_offset_t va) 652{ 653 654 if (pmap == kernel_pmap || pmap->pm_active) 655 invlpg(va); 656} 657 658PMAP_INLINE void 659pmap_invalidate_range(pmap_t pmap, vm_offset_t sva, vm_offset_t eva) 660{ 661 vm_offset_t addr; 662 663 if (pmap == kernel_pmap || pmap->pm_active) 664 for (addr = sva; addr < eva; addr += PAGE_SIZE) 665 invlpg(addr); 666} 667 668PMAP_INLINE void 669pmap_invalidate_all(pmap_t pmap) 670{ 671 672 if (pmap == kernel_pmap || pmap->pm_active) 673 invltlb(); 674} 675#endif /* !SMP */ 676 677/* 678 * Are we current address space or kernel? N.B. We return FALSE when 679 * a pmap's page table is in use because a kernel thread is borrowing 680 * it. The borrowed page table can change spontaneously, making any 681 * dependence on its continued use subject to a race condition. 682 */ 683static __inline int 684pmap_is_current(pmap_t pmap) 685{ 686 687 return (pmap == kernel_pmap || 688 (pmap == vmspace_pmap(curthread->td_proc->p_vmspace) && 689 (pmap->pm_pdir[PTDPTDI] & PG_FRAME) == (PTDpde[0] & PG_FRAME))); 690} 691 692/* 693 * If the given pmap is not the current or kernel pmap, the returned pte must 694 * be released by passing it to pmap_pte_release(). 695 */ 696pt_entry_t * 697pmap_pte(pmap_t pmap, vm_offset_t va) 698{ 699 pd_entry_t newpf; 700 pd_entry_t *pde; 701 702 pde = pmap_pde(pmap, va); 703 if (*pde & PG_PS) 704 return (pde); 705 if (*pde != 0) { 706 /* are we current address space or kernel? */ 707 if (pmap_is_current(pmap)) 708 return (vtopte(va)); 709 mtx_lock(&PMAP2mutex); 710 newpf = *pde & PG_FRAME; 711 if ((*PMAP2 & PG_FRAME) != newpf) { 712 *PMAP2 = newpf | PG_RW | PG_V | PG_A | PG_M; 713 pmap_invalidate_page(kernel_pmap, (vm_offset_t)PADDR2); 714 } 715 return (PADDR2 + (i386_btop(va) & (NPTEPG - 1))); 716 } 717 return (0); 718} 719 720/* 721 * Releases a pte that was obtained from pmap_pte(). Be prepared for the pte 722 * being NULL. 723 */ 724static __inline void 725pmap_pte_release(pt_entry_t *pte) 726{ 727 728 if ((pt_entry_t *)((vm_offset_t)pte & ~PAGE_MASK) == PADDR2) 729 mtx_unlock(&PMAP2mutex); 730} 731 732static __inline void 733invlcaddr(void *caddr) 734{ 735 736 invlpg((u_int)caddr); 737} 738 739/* 740 * Super fast pmap_pte routine best used when scanning 741 * the pv lists. This eliminates many coarse-grained 742 * invltlb calls. Note that many of the pv list 743 * scans are across different pmaps. It is very wasteful 744 * to do an entire invltlb for checking a single mapping. 745 * 746 * If the given pmap is not the current pmap, vm_page_queue_mtx 747 * must be held and curthread pinned to a CPU. 748 */ 749static pt_entry_t * 750pmap_pte_quick(pmap_t pmap, vm_offset_t va) 751{ 752 pd_entry_t newpf; 753 pd_entry_t *pde; 754 755 pde = pmap_pde(pmap, va); 756 if (*pde & PG_PS) 757 return (pde); 758 if (*pde != 0) { 759 /* are we current address space or kernel? */ 760 if (pmap_is_current(pmap)) 761 return (vtopte(va)); 762 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 763 KASSERT(curthread->td_pinned > 0, ("curthread not pinned")); 764 newpf = *pde & PG_FRAME; 765 if ((*PMAP1 & PG_FRAME) != newpf) { 766 *PMAP1 = newpf | PG_RW | PG_V | PG_A | PG_M; 767#ifdef SMP 768 PMAP1cpu = PCPU_GET(cpuid); 769#endif 770 invlcaddr(PADDR1); 771 PMAP1changed++; 772 } else 773#ifdef SMP 774 if (PMAP1cpu != PCPU_GET(cpuid)) { 775 PMAP1cpu = PCPU_GET(cpuid); 776 invlcaddr(PADDR1); 777 PMAP1changedcpu++; 778 } else 779#endif 780 PMAP1unchanged++; 781 return (PADDR1 + (i386_btop(va) & (NPTEPG - 1))); 782 } 783 return (0); 784} 785 786/* 787 * Routine: pmap_extract 788 * Function: 789 * Extract the physical page address associated 790 * with the given map/virtual_address pair. 791 */ 792vm_paddr_t 793pmap_extract(pmap_t pmap, vm_offset_t va) 794{ 795 vm_paddr_t rtval; 796 pt_entry_t *pte; 797 pd_entry_t pde; 798 799 rtval = 0; 800 PMAP_LOCK(pmap); 801 pde = pmap->pm_pdir[va >> PDRSHIFT]; 802 if (pde != 0) { 803 if ((pde & PG_PS) != 0) { 804 rtval = (pde & ~PDRMASK) | (va & PDRMASK); 805 PMAP_UNLOCK(pmap); 806 return rtval; 807 } 808 pte = pmap_pte(pmap, va); 809 rtval = (*pte & PG_FRAME) | (va & PAGE_MASK); 810 pmap_pte_release(pte); 811 } 812 PMAP_UNLOCK(pmap); 813 return (rtval); 814} 815 816/* 817 * Routine: pmap_extract_and_hold 818 * Function: 819 * Atomically extract and hold the physical page 820 * with the given pmap and virtual address pair 821 * if that mapping permits the given protection. 822 */ 823vm_page_t 824pmap_extract_and_hold(pmap_t pmap, vm_offset_t va, vm_prot_t prot) 825{ 826 pd_entry_t pde; 827 pt_entry_t pte; 828 vm_page_t m; 829 830 m = NULL; 831 vm_page_lock_queues(); 832 PMAP_LOCK(pmap); 833 pde = *pmap_pde(pmap, va); 834 if (pde != 0) { 835 if (pde & PG_PS) { 836 if ((pde & PG_RW) || (prot & VM_PROT_WRITE) == 0) { 837 m = PHYS_TO_VM_PAGE((pde & ~PDRMASK) | 838 (va & PDRMASK)); 839 vm_page_hold(m); 840 } 841 } else { 842 sched_pin(); 843 pte = *pmap_pte_quick(pmap, va); 844 if (pte != 0 && 845 ((pte & PG_RW) || (prot & VM_PROT_WRITE) == 0)) { 846 m = PHYS_TO_VM_PAGE(pte & PG_FRAME); 847 vm_page_hold(m); 848 } 849 sched_unpin(); 850 } 851 } 852 vm_page_unlock_queues(); 853 PMAP_UNLOCK(pmap); 854 return (m); 855} 856 857/*************************************************** 858 * Low level mapping routines..... 859 ***************************************************/ 860 861/* 862 * Add a wired page to the kva. 863 * Note: not SMP coherent. 864 */ 865PMAP_INLINE void 866pmap_kenter(vm_offset_t va, vm_paddr_t pa) 867{ 868 pt_entry_t *pte; 869 870 pte = vtopte(va); 871 pte_store(pte, pa | PG_RW | PG_V | pgeflag); 872} 873 874/* 875 * Remove a page from the kernel pagetables. 876 * Note: not SMP coherent. 877 */ 878PMAP_INLINE void 879pmap_kremove(vm_offset_t va) 880{ 881 pt_entry_t *pte; 882 883 pte = vtopte(va); 884 pte_clear(pte); 885} 886 887/* 888 * Used to map a range of physical addresses into kernel 889 * virtual address space. 890 * 891 * The value passed in '*virt' is a suggested virtual address for 892 * the mapping. Architectures which can support a direct-mapped 893 * physical to virtual region can return the appropriate address 894 * within that region, leaving '*virt' unchanged. Other 895 * architectures should map the pages starting at '*virt' and 896 * update '*virt' with the first usable address after the mapped 897 * region. 898 */ 899vm_offset_t 900pmap_map(vm_offset_t *virt, vm_paddr_t start, vm_paddr_t end, int prot) 901{ 902 vm_offset_t va, sva; 903 904 va = sva = *virt; 905 while (start < end) { 906 pmap_kenter(va, start); 907 va += PAGE_SIZE; 908 start += PAGE_SIZE; 909 } 910 pmap_invalidate_range(kernel_pmap, sva, va); 911 *virt = va; 912 return (sva); 913} 914 915 916/* 917 * Add a list of wired pages to the kva 918 * this routine is only used for temporary 919 * kernel mappings that do not need to have 920 * page modification or references recorded. 921 * Note that old mappings are simply written 922 * over. The page *must* be wired. 923 * Note: SMP coherent. Uses a ranged shootdown IPI. 924 */ 925void 926pmap_qenter(vm_offset_t sva, vm_page_t *m, int count) 927{ 928 vm_offset_t va; 929 930 va = sva; 931 while (count-- > 0) { 932 pmap_kenter(va, VM_PAGE_TO_PHYS(*m)); 933 va += PAGE_SIZE; 934 m++; 935 } 936 pmap_invalidate_range(kernel_pmap, sva, va); 937} 938 939/* 940 * This routine tears out page mappings from the 941 * kernel -- it is meant only for temporary mappings. 942 * Note: SMP coherent. Uses a ranged shootdown IPI. 943 */ 944void 945pmap_qremove(vm_offset_t sva, int count) 946{ 947 vm_offset_t va; 948 949 va = sva; 950 while (count-- > 0) { 951 pmap_kremove(va); 952 va += PAGE_SIZE; 953 } 954 pmap_invalidate_range(kernel_pmap, sva, va); 955} 956 957/*************************************************** 958 * Page table page management routines..... 959 ***************************************************/ 960 961/* 962 * This routine unholds page table pages, and if the hold count 963 * drops to zero, then it decrements the wire count. 964 */ 965static PMAP_INLINE int 966pmap_unwire_pte_hold(pmap_t pmap, vm_page_t m) 967{ 968 969 --m->wire_count; 970 if (m->wire_count == 0) 971 return _pmap_unwire_pte_hold(pmap, m); 972 else 973 return 0; 974} 975 976static int 977_pmap_unwire_pte_hold(pmap_t pmap, vm_page_t m) 978{ 979 vm_offset_t pteva; 980 981 /* 982 * unmap the page table page 983 */ 984 pmap->pm_pdir[m->pindex] = 0; 985 --pmap->pm_stats.resident_count; 986 987 /* 988 * Do an invltlb to make the invalidated mapping 989 * take effect immediately. 990 */ 991 pteva = VM_MAXUSER_ADDRESS + i386_ptob(m->pindex); 992 pmap_invalidate_page(pmap, pteva); 993 994 vm_page_free_zero(m); 995 atomic_subtract_int(&cnt.v_wire_count, 1); 996 return 1; 997} 998 999/* 1000 * After removing a page table entry, this routine is used to 1001 * conditionally free the page, and manage the hold/wire counts. 1002 */ 1003static int 1004pmap_unuse_pt(pmap_t pmap, vm_offset_t va) 1005{ 1006 pd_entry_t ptepde; 1007 vm_page_t mpte; 1008 1009 if (va >= VM_MAXUSER_ADDRESS) 1010 return 0; 1011 ptepde = *pmap_pde(pmap, va); 1012 mpte = PHYS_TO_VM_PAGE(ptepde & PG_FRAME); 1013 return pmap_unwire_pte_hold(pmap, mpte); 1014} 1015 1016void 1017pmap_pinit0(pmap) 1018 struct pmap *pmap; 1019{ 1020 1021 PMAP_LOCK_INIT(pmap); 1022 pmap->pm_pdir = (pd_entry_t *)(KERNBASE + (vm_offset_t)IdlePTD); 1023#ifdef PAE 1024 pmap->pm_pdpt = (pdpt_entry_t *)(KERNBASE + (vm_offset_t)IdlePDPT); 1025#endif 1026 pmap->pm_active = 0; 1027 PCPU_SET(curpmap, pmap); 1028 TAILQ_INIT(&pmap->pm_pvlist); 1029 bzero(&pmap->pm_stats, sizeof pmap->pm_stats); 1030 mtx_lock_spin(&allpmaps_lock); 1031 LIST_INSERT_HEAD(&allpmaps, pmap, pm_list); 1032 mtx_unlock_spin(&allpmaps_lock); 1033} 1034 1035/* 1036 * Initialize a preallocated and zeroed pmap structure, 1037 * such as one in a vmspace structure. 1038 */ 1039void 1040pmap_pinit(pmap) 1041 register struct pmap *pmap; 1042{ 1043 vm_page_t m, ptdpg[NPGPTD]; 1044 vm_paddr_t pa; 1045 static int color; 1046 int i; 1047 1048 PMAP_LOCK_INIT(pmap); 1049 1050 /* 1051 * No need to allocate page table space yet but we do need a valid 1052 * page directory table. 1053 */ 1054 if (pmap->pm_pdir == NULL) { 1055 pmap->pm_pdir = (pd_entry_t *)kmem_alloc_nofault(kernel_map, 1056 NBPTD); 1057#ifdef PAE 1058 pmap->pm_pdpt = uma_zalloc(pdptzone, M_WAITOK | M_ZERO); 1059 KASSERT(((vm_offset_t)pmap->pm_pdpt & 1060 ((NPGPTD * sizeof(pdpt_entry_t)) - 1)) == 0, 1061 ("pmap_pinit: pdpt misaligned")); 1062 KASSERT(pmap_kextract((vm_offset_t)pmap->pm_pdpt) < (4ULL<<30), 1063 ("pmap_pinit: pdpt above 4g")); 1064#endif 1065 } 1066 1067 /* 1068 * allocate the page directory page(s) 1069 */ 1070 for (i = 0; i < NPGPTD;) { 1071 m = vm_page_alloc(NULL, color++, 1072 VM_ALLOC_NORMAL | VM_ALLOC_NOOBJ | VM_ALLOC_WIRED | 1073 VM_ALLOC_ZERO); 1074 if (m == NULL) 1075 VM_WAIT; 1076 else { 1077 ptdpg[i++] = m; 1078 } 1079 } 1080 1081 pmap_qenter((vm_offset_t)pmap->pm_pdir, ptdpg, NPGPTD); 1082 1083 for (i = 0; i < NPGPTD; i++) { 1084 if ((ptdpg[i]->flags & PG_ZERO) == 0) 1085 bzero(pmap->pm_pdir + (i * NPDEPG), PAGE_SIZE); 1086 } 1087 1088 mtx_lock_spin(&allpmaps_lock); 1089 LIST_INSERT_HEAD(&allpmaps, pmap, pm_list); 1090 mtx_unlock_spin(&allpmaps_lock); 1091 /* Wire in kernel global address entries. */ 1092 /* XXX copies current process, does not fill in MPPTDI */ 1093 bcopy(PTD + KPTDI, pmap->pm_pdir + KPTDI, nkpt * sizeof(pd_entry_t)); 1094#ifdef SMP 1095 pmap->pm_pdir[MPPTDI] = PTD[MPPTDI]; 1096#endif 1097 1098 /* install self-referential address mapping entry(s) */ 1099 for (i = 0; i < NPGPTD; i++) { 1100 pa = VM_PAGE_TO_PHYS(ptdpg[i]); 1101 pmap->pm_pdir[PTDPTDI + i] = pa | PG_V | PG_RW | PG_A | PG_M; 1102#ifdef PAE 1103 pmap->pm_pdpt[i] = pa | PG_V; 1104#endif 1105 } 1106 1107 pmap->pm_active = 0; 1108 TAILQ_INIT(&pmap->pm_pvlist); 1109 bzero(&pmap->pm_stats, sizeof pmap->pm_stats); 1110} 1111 1112/* 1113 * this routine is called if the page table page is not 1114 * mapped correctly. 1115 */ 1116static vm_page_t 1117_pmap_allocpte(pmap_t pmap, unsigned ptepindex, int flags) 1118{ 1119 vm_paddr_t ptepa; 1120 vm_page_t m; 1121 1122 KASSERT((flags & (M_NOWAIT | M_WAITOK)) == M_NOWAIT || 1123 (flags & (M_NOWAIT | M_WAITOK)) == M_WAITOK, 1124 ("_pmap_allocpte: flags is neither M_NOWAIT nor M_WAITOK")); 1125 1126 /* 1127 * Allocate a page table page. 1128 */ 1129 if ((m = vm_page_alloc(NULL, ptepindex, VM_ALLOC_NOOBJ | 1130 VM_ALLOC_WIRED | VM_ALLOC_ZERO)) == NULL) { 1131 if (flags & M_WAITOK) { 1132 PMAP_UNLOCK(pmap); 1133 vm_page_unlock_queues(); 1134 VM_WAIT; 1135 vm_page_lock_queues(); 1136 PMAP_LOCK(pmap); 1137 } 1138 1139 /* 1140 * Indicate the need to retry. While waiting, the page table 1141 * page may have been allocated. 1142 */ 1143 return (NULL); 1144 } 1145 if ((m->flags & PG_ZERO) == 0) 1146 pmap_zero_page(m); 1147 1148 /* 1149 * Map the pagetable page into the process address space, if 1150 * it isn't already there. 1151 */ 1152 1153 pmap->pm_stats.resident_count++; 1154 1155 ptepa = VM_PAGE_TO_PHYS(m); 1156 pmap->pm_pdir[ptepindex] = 1157 (pd_entry_t) (ptepa | PG_U | PG_RW | PG_V | PG_A | PG_M); 1158 1159 return m; 1160} 1161 1162static vm_page_t 1163pmap_allocpte(pmap_t pmap, vm_offset_t va, int flags) 1164{ 1165 unsigned ptepindex; 1166 pd_entry_t ptepa; 1167 vm_page_t m; 1168 1169 KASSERT((flags & (M_NOWAIT | M_WAITOK)) == M_NOWAIT || 1170 (flags & (M_NOWAIT | M_WAITOK)) == M_WAITOK, 1171 ("pmap_allocpte: flags is neither M_NOWAIT nor M_WAITOK")); 1172 1173 /* 1174 * Calculate pagetable page index 1175 */ 1176 ptepindex = va >> PDRSHIFT; 1177retry: 1178 /* 1179 * Get the page directory entry 1180 */ 1181 ptepa = pmap->pm_pdir[ptepindex]; 1182 1183 /* 1184 * This supports switching from a 4MB page to a 1185 * normal 4K page. 1186 */ 1187 if (ptepa & PG_PS) { 1188 pmap->pm_pdir[ptepindex] = 0; 1189 ptepa = 0; 1190 pmap->pm_stats.resident_count -= NBPDR / PAGE_SIZE; 1191 pmap_invalidate_all(kernel_pmap); 1192 } 1193 1194 /* 1195 * If the page table page is mapped, we just increment the 1196 * hold count, and activate it. 1197 */ 1198 if (ptepa) { 1199 m = PHYS_TO_VM_PAGE(ptepa); 1200 m->wire_count++; 1201 } else { 1202 /* 1203 * Here if the pte page isn't mapped, or if it has 1204 * been deallocated. 1205 */ 1206 m = _pmap_allocpte(pmap, ptepindex, flags); 1207 if (m == NULL && (flags & M_WAITOK)) 1208 goto retry; 1209 } 1210 return (m); 1211} 1212 1213 1214/*************************************************** 1215* Pmap allocation/deallocation routines. 1216 ***************************************************/ 1217 1218#ifdef SMP 1219/* 1220 * Deal with a SMP shootdown of other users of the pmap that we are 1221 * trying to dispose of. This can be a bit hairy. 1222 */ 1223static u_int *lazymask; 1224static u_int lazyptd; 1225static volatile u_int lazywait; 1226 1227void pmap_lazyfix_action(void); 1228 1229void 1230pmap_lazyfix_action(void) 1231{ 1232 u_int mymask = PCPU_GET(cpumask); 1233 1234 if (rcr3() == lazyptd) 1235 load_cr3(PCPU_GET(curpcb)->pcb_cr3); 1236 atomic_clear_int(lazymask, mymask); 1237 atomic_store_rel_int(&lazywait, 1); 1238} 1239 1240static void 1241pmap_lazyfix_self(u_int mymask) 1242{ 1243 1244 if (rcr3() == lazyptd) 1245 load_cr3(PCPU_GET(curpcb)->pcb_cr3); 1246 atomic_clear_int(lazymask, mymask); 1247} 1248 1249 1250static void 1251pmap_lazyfix(pmap_t pmap) 1252{ 1253 u_int mymask; 1254 u_int mask; 1255 register u_int spins; 1256 1257 while ((mask = pmap->pm_active) != 0) { 1258 spins = 50000000; 1259 mask = mask & -mask; /* Find least significant set bit */ 1260 mtx_lock_spin(&smp_ipi_mtx); 1261#ifdef PAE 1262 lazyptd = vtophys(pmap->pm_pdpt); 1263#else 1264 lazyptd = vtophys(pmap->pm_pdir); 1265#endif 1266 mymask = PCPU_GET(cpumask); 1267 if (mask == mymask) { 1268 lazymask = &pmap->pm_active; 1269 pmap_lazyfix_self(mymask); 1270 } else { 1271 atomic_store_rel_int((u_int *)&lazymask, 1272 (u_int)&pmap->pm_active); 1273 atomic_store_rel_int(&lazywait, 0); 1274 ipi_selected(mask, IPI_LAZYPMAP); 1275 while (lazywait == 0) { 1276 ia32_pause(); 1277 if (--spins == 0) 1278 break; 1279 } 1280 } 1281 mtx_unlock_spin(&smp_ipi_mtx); 1282 if (spins == 0) 1283 printf("pmap_lazyfix: spun for 50000000\n"); 1284 } 1285} 1286 1287#else /* SMP */ 1288 1289/* 1290 * Cleaning up on uniprocessor is easy. For various reasons, we're 1291 * unlikely to have to even execute this code, including the fact 1292 * that the cleanup is deferred until the parent does a wait(2), which 1293 * means that another userland process has run. 1294 */ 1295static void 1296pmap_lazyfix(pmap_t pmap) 1297{ 1298 u_int cr3; 1299 1300 cr3 = vtophys(pmap->pm_pdir); 1301 if (cr3 == rcr3()) { 1302 load_cr3(PCPU_GET(curpcb)->pcb_cr3); 1303 pmap->pm_active &= ~(PCPU_GET(cpumask)); 1304 } 1305} 1306#endif /* SMP */ 1307 1308/* 1309 * Release any resources held by the given physical map. 1310 * Called when a pmap initialized by pmap_pinit is being released. 1311 * Should only be called if the map contains no valid mappings. 1312 */ 1313void 1314pmap_release(pmap_t pmap) 1315{ 1316 vm_page_t m, ptdpg[NPGPTD]; 1317 int i; 1318 1319 KASSERT(pmap->pm_stats.resident_count == 0, 1320 ("pmap_release: pmap resident count %ld != 0", 1321 pmap->pm_stats.resident_count)); 1322 1323 pmap_lazyfix(pmap); 1324 mtx_lock_spin(&allpmaps_lock); 1325 LIST_REMOVE(pmap, pm_list); 1326 mtx_unlock_spin(&allpmaps_lock); 1327 1328 for (i = 0; i < NPGPTD; i++) 1329 ptdpg[i] = PHYS_TO_VM_PAGE(pmap->pm_pdir[PTDPTDI + i]); 1330 1331 bzero(pmap->pm_pdir + PTDPTDI, (nkpt + NPGPTD) * 1332 sizeof(*pmap->pm_pdir)); 1333#ifdef SMP 1334 pmap->pm_pdir[MPPTDI] = 0; 1335#endif 1336 1337 pmap_qremove((vm_offset_t)pmap->pm_pdir, NPGPTD); 1338 1339 vm_page_lock_queues(); 1340 for (i = 0; i < NPGPTD; i++) { 1341 m = ptdpg[i]; 1342#ifdef PAE 1343 KASSERT(VM_PAGE_TO_PHYS(m) == (pmap->pm_pdpt[i] & PG_FRAME), 1344 ("pmap_release: got wrong ptd page")); 1345#endif 1346 m->wire_count--; 1347 atomic_subtract_int(&cnt.v_wire_count, 1); 1348 vm_page_free_zero(m); 1349 } 1350 vm_page_unlock_queues(); 1351 PMAP_LOCK_DESTROY(pmap); 1352} 1353 1354static int 1355kvm_size(SYSCTL_HANDLER_ARGS) 1356{ 1357 unsigned long ksize = VM_MAX_KERNEL_ADDRESS - KERNBASE; 1358 1359 return sysctl_handle_long(oidp, &ksize, 0, req); 1360} 1361SYSCTL_PROC(_vm, OID_AUTO, kvm_size, CTLTYPE_LONG|CTLFLAG_RD, 1362 0, 0, kvm_size, "IU", "Size of KVM"); 1363 1364static int 1365kvm_free(SYSCTL_HANDLER_ARGS) 1366{ 1367 unsigned long kfree = VM_MAX_KERNEL_ADDRESS - kernel_vm_end; 1368 1369 return sysctl_handle_long(oidp, &kfree, 0, req); 1370} 1371SYSCTL_PROC(_vm, OID_AUTO, kvm_free, CTLTYPE_LONG|CTLFLAG_RD, 1372 0, 0, kvm_free, "IU", "Amount of KVM free"); 1373 1374/* 1375 * grow the number of kernel page table entries, if needed 1376 */ 1377void 1378pmap_growkernel(vm_offset_t addr) 1379{ 1380 struct pmap *pmap; 1381 vm_paddr_t ptppaddr; 1382 vm_page_t nkpg; 1383 pd_entry_t newpdir; 1384 pt_entry_t *pde; 1385 1386 mtx_assert(&kernel_map->system_mtx, MA_OWNED); 1387 if (kernel_vm_end == 0) { 1388 kernel_vm_end = KERNBASE; 1389 nkpt = 0; 1390 while (pdir_pde(PTD, kernel_vm_end)) { 1391 kernel_vm_end = (kernel_vm_end + PAGE_SIZE * NPTEPG) & ~(PAGE_SIZE * NPTEPG - 1); 1392 nkpt++; 1393 } 1394 } 1395 addr = roundup2(addr, PAGE_SIZE * NPTEPG); 1396 while (kernel_vm_end < addr) { 1397 if (pdir_pde(PTD, kernel_vm_end)) { 1398 kernel_vm_end = (kernel_vm_end + PAGE_SIZE * NPTEPG) & ~(PAGE_SIZE * NPTEPG - 1); 1399 continue; 1400 } 1401 1402 /* 1403 * This index is bogus, but out of the way 1404 */ 1405 nkpg = vm_page_alloc(NULL, nkpt, 1406 VM_ALLOC_NOOBJ | VM_ALLOC_SYSTEM | VM_ALLOC_WIRED); 1407 if (!nkpg) 1408 panic("pmap_growkernel: no memory to grow kernel"); 1409 1410 nkpt++; 1411 1412 pmap_zero_page(nkpg); 1413 ptppaddr = VM_PAGE_TO_PHYS(nkpg); 1414 newpdir = (pd_entry_t) (ptppaddr | PG_V | PG_RW | PG_A | PG_M); 1415 pdir_pde(PTD, kernel_vm_end) = newpdir; 1416 1417 mtx_lock_spin(&allpmaps_lock); 1418 LIST_FOREACH(pmap, &allpmaps, pm_list) { 1419 pde = pmap_pde(pmap, kernel_vm_end); 1420 pde_store(pde, newpdir); 1421 } 1422 mtx_unlock_spin(&allpmaps_lock); 1423 kernel_vm_end = (kernel_vm_end + PAGE_SIZE * NPTEPG) & ~(PAGE_SIZE * NPTEPG - 1); 1424 } 1425} 1426 1427 1428/*************************************************** 1429 * page management routines. 1430 ***************************************************/ 1431 1432/* 1433 * free the pv_entry back to the free list 1434 */ 1435static PMAP_INLINE void 1436free_pv_entry(pv_entry_t pv) 1437{ 1438 pv_entry_count--; 1439 uma_zfree(pvzone, pv); 1440} 1441 1442/* 1443 * get a new pv_entry, allocating a block from the system 1444 * when needed. 1445 */ 1446static pv_entry_t 1447get_pv_entry(pmap_t locked_pmap) 1448{ 1449 static const struct timeval printinterval = { 60, 0 }; 1450 static struct timeval lastprint; 1451 struct vpgqueues *vpq; 1452 pmap_t pmap; 1453 pt_entry_t *pte, tpte; 1454 pv_entry_t allocated_pv, next_pv, pv; 1455 vm_offset_t va; 1456 vm_page_t m; 1457 1458 PMAP_LOCK_ASSERT(locked_pmap, MA_OWNED); 1459 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 1460 allocated_pv = uma_zalloc(pvzone, M_NOWAIT); 1461 if (allocated_pv != NULL) { 1462 pv_entry_count++; 1463 if (pv_entry_count > pv_entry_high_water) 1464 pagedaemon_wakeup(); 1465 else 1466 return (allocated_pv); 1467 } 1468 1469 /* 1470 * Reclaim pv entries: At first, destroy mappings to inactive 1471 * pages. After that, if a pv entry is still needed, destroy 1472 * mappings to active pages. 1473 */ 1474 if (ratecheck(&lastprint, &printinterval)) 1475 printf("Approaching the limit on PV entries, " 1476 "increase the vm.pmap.shpgperproc tunable.\n"); 1477 vpq = &vm_page_queues[PQ_INACTIVE]; 1478retry: 1479 sched_pin(); 1480 TAILQ_FOREACH(m, &vpq->pl, pageq) { 1481 if (m->hold_count || m->busy || (m->flags & PG_BUSY)) 1482 continue; 1483 TAILQ_FOREACH_SAFE(pv, &m->md.pv_list, pv_list, next_pv) { 1484 va = pv->pv_va; 1485 pmap = pv->pv_pmap; 1486 if (pmap != locked_pmap && !PMAP_TRYLOCK(pmap)) 1487 continue; 1488 pmap->pm_stats.resident_count--; 1489 pte = pmap_pte_quick(pmap, va); 1490 tpte = pte_load_clear(pte); 1491 KASSERT((tpte & PG_W) == 0, 1492 ("get_pv_entry: wired pte %#jx", (uintmax_t)tpte)); 1493 if (tpte & PG_A) 1494 vm_page_flag_set(m, PG_REFERENCED); 1495 if (tpte & PG_M) { 1496 KASSERT((tpte & PG_RW), 1497 ("get_pv_entry: modified page not writable: va: %#x, pte: %#jx", 1498 va, (uintmax_t)tpte)); 1499 if (pmap_track_modified(va)) 1500 vm_page_dirty(m); 1501 } 1502 pmap_invalidate_page(pmap, va); 1503 TAILQ_REMOVE(&pmap->pm_pvlist, pv, pv_plist); 1504 TAILQ_REMOVE(&m->md.pv_list, pv, pv_list); 1505 if (TAILQ_EMPTY(&m->md.pv_list)) 1506 vm_page_flag_clear(m, PG_WRITEABLE); 1507 m->md.pv_list_count--; 1508 pmap_unuse_pt(pmap, va); 1509 if (pmap != locked_pmap) 1510 PMAP_UNLOCK(pmap); 1511 if (allocated_pv == NULL) 1512 allocated_pv = pv; 1513 else 1514 free_pv_entry(pv); 1515 } 1516 } 1517 sched_unpin(); 1518 if (allocated_pv == NULL) { 1519 if (vpq == &vm_page_queues[PQ_INACTIVE]) { 1520 vpq = &vm_page_queues[PQ_ACTIVE]; 1521 goto retry; 1522 } 1523 panic("get_pv_entry: increase the vm.pmap.shpgperproc tunable"); 1524 } 1525 return (allocated_pv); 1526} 1527 1528static void 1529pmap_remove_entry(pmap_t pmap, vm_page_t m, vm_offset_t va) 1530{ 1531 pv_entry_t pv; 1532 1533 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 1534 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 1535 if (m->md.pv_list_count < pmap->pm_stats.resident_count) { 1536 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 1537 if (pmap == pv->pv_pmap && va == pv->pv_va) 1538 break; 1539 } 1540 } else { 1541 TAILQ_FOREACH(pv, &pmap->pm_pvlist, pv_plist) { 1542 if (va == pv->pv_va) 1543 break; 1544 } 1545 } 1546 KASSERT(pv != NULL, ("pmap_remove_entry: pv not found")); 1547 TAILQ_REMOVE(&m->md.pv_list, pv, pv_list); 1548 m->md.pv_list_count--; 1549 if (TAILQ_EMPTY(&m->md.pv_list)) 1550 vm_page_flag_clear(m, PG_WRITEABLE); 1551 TAILQ_REMOVE(&pmap->pm_pvlist, pv, pv_plist); 1552 free_pv_entry(pv); 1553} 1554 1555/* 1556 * Create a pv entry for page at pa for 1557 * (pmap, va). 1558 */ 1559static void 1560pmap_insert_entry(pmap_t pmap, vm_offset_t va, vm_page_t m) 1561{ 1562 pv_entry_t pv; 1563 1564 pv = get_pv_entry(pmap); 1565 pv->pv_va = va; 1566 pv->pv_pmap = pmap; 1567 1568 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 1569 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 1570 TAILQ_INSERT_TAIL(&pmap->pm_pvlist, pv, pv_plist); 1571 TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list); 1572 m->md.pv_list_count++; 1573} 1574 1575/* 1576 * pmap_remove_pte: do the things to unmap a page in a process 1577 */ 1578static int 1579pmap_remove_pte(pmap_t pmap, pt_entry_t *ptq, vm_offset_t va) 1580{ 1581 pt_entry_t oldpte; 1582 vm_page_t m; 1583 1584 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 1585 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 1586 oldpte = pte_load_clear(ptq); 1587 if (oldpte & PG_W) 1588 pmap->pm_stats.wired_count -= 1; 1589 /* 1590 * Machines that don't support invlpg, also don't support 1591 * PG_G. 1592 */ 1593 if (oldpte & PG_G) 1594 pmap_invalidate_page(kernel_pmap, va); 1595 pmap->pm_stats.resident_count -= 1; 1596 if (oldpte & PG_MANAGED) { 1597 m = PHYS_TO_VM_PAGE(oldpte); 1598 if (oldpte & PG_M) { 1599 KASSERT((oldpte & PG_RW), 1600 ("pmap_remove_pte: modified page not writable: va: %#x, pte: %#jx", 1601 va, (uintmax_t)oldpte)); 1602 if (pmap_track_modified(va)) 1603 vm_page_dirty(m); 1604 } 1605 if (oldpte & PG_A) 1606 vm_page_flag_set(m, PG_REFERENCED); 1607 pmap_remove_entry(pmap, m, va); 1608 } 1609 return (pmap_unuse_pt(pmap, va)); 1610} 1611 1612/* 1613 * Remove a single page from a process address space 1614 */ 1615static void 1616pmap_remove_page(pmap_t pmap, vm_offset_t va) 1617{ 1618 pt_entry_t *pte; 1619 1620 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 1621 KASSERT(curthread->td_pinned > 0, ("curthread not pinned")); 1622 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 1623 if ((pte = pmap_pte_quick(pmap, va)) == NULL || *pte == 0) 1624 return; 1625 pmap_remove_pte(pmap, pte, va); 1626 pmap_invalidate_page(pmap, va); 1627} 1628 1629/* 1630 * Remove the given range of addresses from the specified map. 1631 * 1632 * It is assumed that the start and end are properly 1633 * rounded to the page size. 1634 */ 1635void 1636pmap_remove(pmap_t pmap, vm_offset_t sva, vm_offset_t eva) 1637{ 1638 vm_offset_t pdnxt; 1639 pd_entry_t ptpaddr; 1640 pt_entry_t *pte; 1641 int anyvalid; 1642 1643 /* 1644 * Perform an unsynchronized read. This is, however, safe. 1645 */ 1646 if (pmap->pm_stats.resident_count == 0) 1647 return; 1648 1649 anyvalid = 0; 1650 1651 vm_page_lock_queues(); 1652 sched_pin(); 1653 PMAP_LOCK(pmap); 1654 1655 /* 1656 * special handling of removing one page. a very 1657 * common operation and easy to short circuit some 1658 * code. 1659 */ 1660 if ((sva + PAGE_SIZE == eva) && 1661 ((pmap->pm_pdir[(sva >> PDRSHIFT)] & PG_PS) == 0)) { 1662 pmap_remove_page(pmap, sva); 1663 goto out; 1664 } 1665 1666 for (; sva < eva; sva = pdnxt) { 1667 unsigned pdirindex; 1668 1669 /* 1670 * Calculate index for next page table. 1671 */ 1672 pdnxt = (sva + NBPDR) & ~PDRMASK; 1673 if (pmap->pm_stats.resident_count == 0) 1674 break; 1675 1676 pdirindex = sva >> PDRSHIFT; 1677 ptpaddr = pmap->pm_pdir[pdirindex]; 1678 1679 /* 1680 * Weed out invalid mappings. Note: we assume that the page 1681 * directory table is always allocated, and in kernel virtual. 1682 */ 1683 if (ptpaddr == 0) 1684 continue; 1685 1686 /* 1687 * Check for large page. 1688 */ 1689 if ((ptpaddr & PG_PS) != 0) { 1690 pmap->pm_pdir[pdirindex] = 0; 1691 pmap->pm_stats.resident_count -= NBPDR / PAGE_SIZE; 1692 anyvalid = 1; 1693 continue; 1694 } 1695 1696 /* 1697 * Limit our scan to either the end of the va represented 1698 * by the current page table page, or to the end of the 1699 * range being removed. 1700 */ 1701 if (pdnxt > eva) 1702 pdnxt = eva; 1703 1704 for (pte = pmap_pte_quick(pmap, sva); sva != pdnxt; pte++, 1705 sva += PAGE_SIZE) { 1706 if (*pte == 0) 1707 continue; 1708 anyvalid = 1; 1709 if (pmap_remove_pte(pmap, pte, sva)) 1710 break; 1711 } 1712 } 1713out: 1714 sched_unpin(); 1715 vm_page_unlock_queues(); 1716 if (anyvalid) 1717 pmap_invalidate_all(pmap); 1718 PMAP_UNLOCK(pmap); 1719} 1720 1721/* 1722 * Routine: pmap_remove_all 1723 * Function: 1724 * Removes this physical page from 1725 * all physical maps in which it resides. 1726 * Reflects back modify bits to the pager. 1727 * 1728 * Notes: 1729 * Original versions of this routine were very 1730 * inefficient because they iteratively called 1731 * pmap_remove (slow...) 1732 */ 1733 1734void 1735pmap_remove_all(vm_page_t m) 1736{ 1737 register pv_entry_t pv; 1738 pt_entry_t *pte, tpte; 1739 1740#if defined(PMAP_DIAGNOSTIC) 1741 /* 1742 * XXX This makes pmap_remove_all() illegal for non-managed pages! 1743 */ 1744 if (m->flags & PG_FICTITIOUS) { 1745 panic("pmap_remove_all: illegal for unmanaged page, va: 0x%x", 1746 VM_PAGE_TO_PHYS(m)); 1747 } 1748#endif 1749 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 1750 sched_pin(); 1751 while ((pv = TAILQ_FIRST(&m->md.pv_list)) != NULL) { 1752 PMAP_LOCK(pv->pv_pmap); 1753 pv->pv_pmap->pm_stats.resident_count--; 1754 pte = pmap_pte_quick(pv->pv_pmap, pv->pv_va); 1755 tpte = pte_load_clear(pte); 1756 if (tpte & PG_W) 1757 pv->pv_pmap->pm_stats.wired_count--; 1758 if (tpte & PG_A) 1759 vm_page_flag_set(m, PG_REFERENCED); 1760 1761 /* 1762 * Update the vm_page_t clean and reference bits. 1763 */ 1764 if (tpte & PG_M) { 1765 KASSERT((tpte & PG_RW), 1766 ("pmap_remove_all: modified page not writable: va: %#x, pte: %#jx", 1767 pv->pv_va, (uintmax_t)tpte)); 1768 if (pmap_track_modified(pv->pv_va)) 1769 vm_page_dirty(m); 1770 } 1771 pmap_invalidate_page(pv->pv_pmap, pv->pv_va); 1772 TAILQ_REMOVE(&pv->pv_pmap->pm_pvlist, pv, pv_plist); 1773 TAILQ_REMOVE(&m->md.pv_list, pv, pv_list); 1774 m->md.pv_list_count--; 1775 pmap_unuse_pt(pv->pv_pmap, pv->pv_va); 1776 PMAP_UNLOCK(pv->pv_pmap); 1777 free_pv_entry(pv); 1778 } 1779 vm_page_flag_clear(m, PG_WRITEABLE); 1780 sched_unpin(); 1781} 1782 1783/* 1784 * Set the physical protection on the 1785 * specified range of this map as requested. 1786 */ 1787void 1788pmap_protect(pmap_t pmap, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot) 1789{ 1790 vm_offset_t pdnxt; 1791 pd_entry_t ptpaddr; 1792 pt_entry_t *pte; 1793 int anychanged; 1794 1795 if ((prot & VM_PROT_READ) == VM_PROT_NONE) { 1796 pmap_remove(pmap, sva, eva); 1797 return; 1798 } 1799 1800 if (prot & VM_PROT_WRITE) 1801 return; 1802 1803 anychanged = 0; 1804 1805 vm_page_lock_queues(); 1806 sched_pin(); 1807 PMAP_LOCK(pmap); 1808 for (; sva < eva; sva = pdnxt) { 1809 unsigned obits, pbits, pdirindex; 1810 1811 pdnxt = (sva + NBPDR) & ~PDRMASK; 1812 1813 pdirindex = sva >> PDRSHIFT; 1814 ptpaddr = pmap->pm_pdir[pdirindex]; 1815 1816 /* 1817 * Weed out invalid mappings. Note: we assume that the page 1818 * directory table is always allocated, and in kernel virtual. 1819 */ 1820 if (ptpaddr == 0) 1821 continue; 1822 1823 /* 1824 * Check for large page. 1825 */ 1826 if ((ptpaddr & PG_PS) != 0) { 1827 pmap->pm_pdir[pdirindex] &= ~(PG_M|PG_RW); 1828 anychanged = 1; 1829 continue; 1830 } 1831 1832 if (pdnxt > eva) 1833 pdnxt = eva; 1834 1835 for (pte = pmap_pte_quick(pmap, sva); sva != pdnxt; pte++, 1836 sva += PAGE_SIZE) { 1837 vm_page_t m; 1838 1839retry: 1840 /* 1841 * Regardless of whether a pte is 32 or 64 bits in 1842 * size, PG_RW, PG_A, and PG_M are among the least 1843 * significant 32 bits. 1844 */ 1845 obits = pbits = *(u_int *)pte; 1846 if (pbits & PG_MANAGED) { 1847 m = NULL; 1848 if (pbits & PG_A) { 1849 m = PHYS_TO_VM_PAGE(*pte); 1850 vm_page_flag_set(m, PG_REFERENCED); 1851 pbits &= ~PG_A; 1852 } 1853 if ((pbits & PG_M) != 0 && 1854 pmap_track_modified(sva)) { 1855 if (m == NULL) 1856 m = PHYS_TO_VM_PAGE(*pte); 1857 vm_page_dirty(m); 1858 } 1859 } 1860 1861 pbits &= ~(PG_RW | PG_M); 1862 1863 if (pbits != obits) { 1864 if (!atomic_cmpset_int((u_int *)pte, obits, 1865 pbits)) 1866 goto retry; 1867 if (obits & PG_G) 1868 pmap_invalidate_page(pmap, sva); 1869 else 1870 anychanged = 1; 1871 } 1872 } 1873 } 1874 sched_unpin(); 1875 vm_page_unlock_queues(); 1876 if (anychanged) 1877 pmap_invalidate_all(pmap); 1878 PMAP_UNLOCK(pmap); 1879} 1880 1881/* 1882 * Insert the given physical page (p) at 1883 * the specified virtual address (v) in the 1884 * target physical map with the protection requested. 1885 * 1886 * If specified, the page will be wired down, meaning 1887 * that the related pte can not be reclaimed. 1888 * 1889 * NB: This is the only routine which MAY NOT lazy-evaluate 1890 * or lose information. That is, this routine must actually 1891 * insert this page into the given map NOW. 1892 */ 1893void 1894pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot, 1895 boolean_t wired) 1896{ 1897 vm_paddr_t pa; 1898 register pt_entry_t *pte; 1899 vm_paddr_t opa; 1900 pt_entry_t origpte, newpte; 1901 vm_page_t mpte, om; 1902 boolean_t invlva; 1903 1904 va &= PG_FRAME; 1905#ifdef PMAP_DIAGNOSTIC 1906 if (va > VM_MAX_KERNEL_ADDRESS) 1907 panic("pmap_enter: toobig"); 1908 if ((va >= UPT_MIN_ADDRESS) && (va < UPT_MAX_ADDRESS)) 1909 panic("pmap_enter: invalid to pmap_enter page table pages (va: 0x%x)", va); 1910#endif 1911 1912 mpte = NULL; 1913 1914 vm_page_lock_queues(); 1915 PMAP_LOCK(pmap); 1916 sched_pin(); 1917 1918 /* 1919 * In the case that a page table page is not 1920 * resident, we are creating it here. 1921 */ 1922 if (va < VM_MAXUSER_ADDRESS) { 1923 mpte = pmap_allocpte(pmap, va, M_WAITOK); 1924 } 1925#if 0 && defined(PMAP_DIAGNOSTIC) 1926 else { 1927 pd_entry_t *pdeaddr = pmap_pde(pmap, va); 1928 origpte = *pdeaddr; 1929 if ((origpte & PG_V) == 0) { 1930 panic("pmap_enter: invalid kernel page table page, pdir=%p, pde=%p, va=%p\n", 1931 pmap->pm_pdir[PTDPTDI], origpte, va); 1932 } 1933 } 1934#endif 1935 1936 pte = pmap_pte_quick(pmap, va); 1937 1938 /* 1939 * Page Directory table entry not valid, we need a new PT page 1940 */ 1941 if (pte == NULL) { 1942 panic("pmap_enter: invalid page directory pdir=%#jx, va=%#x\n", 1943 (uintmax_t)pmap->pm_pdir[PTDPTDI], va); 1944 } 1945 1946 pa = VM_PAGE_TO_PHYS(m); 1947 om = NULL; 1948 origpte = *pte; 1949 opa = origpte & PG_FRAME; 1950 1951 if (origpte & PG_PS) { 1952 /* 1953 * Yes, I know this will truncate upper address bits for PAE, 1954 * but I'm actually more interested in the lower bits 1955 */ 1956 printf("pmap_enter: va %p, pte %p, origpte %p\n", 1957 (void *)va, (void *)pte, (void *)(uintptr_t)origpte); 1958 panic("pmap_enter: attempted pmap_enter on 4MB page"); 1959 } 1960 1961 /* 1962 * Mapping has not changed, must be protection or wiring change. 1963 */ 1964 if (origpte && (opa == pa)) { 1965 /* 1966 * Wiring change, just update stats. We don't worry about 1967 * wiring PT pages as they remain resident as long as there 1968 * are valid mappings in them. Hence, if a user page is wired, 1969 * the PT page will be also. 1970 */ 1971 if (wired && ((origpte & PG_W) == 0)) 1972 pmap->pm_stats.wired_count++; 1973 else if (!wired && (origpte & PG_W)) 1974 pmap->pm_stats.wired_count--; 1975 1976 /* 1977 * Remove extra pte reference 1978 */ 1979 if (mpte) 1980 mpte->wire_count--; 1981 1982 /* 1983 * We might be turning off write access to the page, 1984 * so we go ahead and sense modify status. 1985 */ 1986 if (origpte & PG_MANAGED) { 1987 om = m; 1988 pa |= PG_MANAGED; 1989 } 1990 goto validate; 1991 } 1992 /* 1993 * Mapping has changed, invalidate old range and fall through to 1994 * handle validating new mapping. 1995 */ 1996 if (opa) { 1997 if (origpte & PG_W) 1998 pmap->pm_stats.wired_count--; 1999 if (origpte & PG_MANAGED) { 2000 om = PHYS_TO_VM_PAGE(opa); 2001 pmap_remove_entry(pmap, om, va); 2002 } 2003 if (mpte != NULL) { 2004 mpte->wire_count--; 2005 KASSERT(mpte->wire_count > 0, 2006 ("pmap_enter: missing reference to page table page," 2007 " va: 0x%x", va)); 2008 } 2009 } else 2010 pmap->pm_stats.resident_count++; 2011 2012 /* 2013 * Enter on the PV list if part of our managed memory. 2014 */ 2015 if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0) { 2016 pmap_insert_entry(pmap, va, m); 2017 pa |= PG_MANAGED; 2018 } 2019 2020 /* 2021 * Increment counters 2022 */ 2023 if (wired) 2024 pmap->pm_stats.wired_count++; 2025 2026validate: 2027 /* 2028 * Now validate mapping with desired protection/wiring. 2029 */ 2030 newpte = (pt_entry_t)(pa | PG_V); 2031 if ((prot & VM_PROT_WRITE) != 0) 2032 newpte |= PG_RW; 2033 if (wired) 2034 newpte |= PG_W; 2035 if (va < VM_MAXUSER_ADDRESS) 2036 newpte |= PG_U; 2037 if (pmap == kernel_pmap) 2038 newpte |= pgeflag; 2039 2040 /* 2041 * if the mapping or permission bits are different, we need 2042 * to update the pte. 2043 */ 2044 if ((origpte & ~(PG_M|PG_A)) != newpte) { 2045 if (origpte & PG_V) { 2046 invlva = FALSE; 2047 origpte = pte_load_store(pte, newpte | PG_A); 2048 if (origpte & PG_A) { 2049 if (origpte & PG_MANAGED) 2050 vm_page_flag_set(om, PG_REFERENCED); 2051 if (opa != VM_PAGE_TO_PHYS(m)) 2052 invlva = TRUE; 2053 } 2054 if (origpte & PG_M) { 2055 KASSERT((origpte & PG_RW), 2056 ("pmap_enter: modified page not writable: va: %#x, pte: %#jx", 2057 va, (uintmax_t)origpte)); 2058 if ((origpte & PG_MANAGED) && 2059 pmap_track_modified(va)) 2060 vm_page_dirty(om); 2061 if ((prot & VM_PROT_WRITE) == 0) 2062 invlva = TRUE; 2063 } 2064 if (invlva) 2065 pmap_invalidate_page(pmap, va); 2066 } else 2067 pte_store(pte, newpte | PG_A); 2068 } 2069 sched_unpin(); 2070 vm_page_unlock_queues(); 2071 PMAP_UNLOCK(pmap); 2072} 2073 2074/* 2075 * this code makes some *MAJOR* assumptions: 2076 * 1. Current pmap & pmap exists. 2077 * 2. Not wired. 2078 * 3. Read access. 2079 * 4. No page table pages. 2080 * but is *MUCH* faster than pmap_enter... 2081 */ 2082 2083vm_page_t 2084pmap_enter_quick(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot, 2085 vm_page_t mpte) 2086{ 2087 pt_entry_t *pte; 2088 vm_paddr_t pa; 2089 2090 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 2091 VM_OBJECT_LOCK_ASSERT(m->object, MA_OWNED); 2092 PMAP_LOCK(pmap); 2093 2094 /* 2095 * In the case that a page table page is not 2096 * resident, we are creating it here. 2097 */ 2098 if (va < VM_MAXUSER_ADDRESS) { 2099 unsigned ptepindex; 2100 pd_entry_t ptepa; 2101 2102 /* 2103 * Calculate pagetable page index 2104 */ 2105 ptepindex = va >> PDRSHIFT; 2106 if (mpte && (mpte->pindex == ptepindex)) { 2107 mpte->wire_count++; 2108 } else { 2109retry: 2110 /* 2111 * Get the page directory entry 2112 */ 2113 ptepa = pmap->pm_pdir[ptepindex]; 2114 2115 /* 2116 * If the page table page is mapped, we just increment 2117 * the hold count, and activate it. 2118 */ 2119 if (ptepa) { 2120 if (ptepa & PG_PS) 2121 panic("pmap_enter_quick: unexpected mapping into 4MB page"); 2122 mpte = PHYS_TO_VM_PAGE(ptepa); 2123 mpte->wire_count++; 2124 } else { 2125 mpte = _pmap_allocpte(pmap, ptepindex, 2126 M_NOWAIT); 2127 if (mpte == NULL) { 2128 PMAP_UNLOCK(pmap); 2129 vm_page_busy(m); 2130 vm_page_unlock_queues(); 2131 VM_OBJECT_UNLOCK(m->object); 2132 VM_WAIT; 2133 VM_OBJECT_LOCK(m->object); 2134 vm_page_lock_queues(); 2135 vm_page_wakeup(m); 2136 PMAP_LOCK(pmap); 2137 goto retry; 2138 } 2139 } 2140 } 2141 } else { 2142 mpte = NULL; 2143 } 2144 2145 /* 2146 * This call to vtopte makes the assumption that we are 2147 * entering the page into the current pmap. In order to support 2148 * quick entry into any pmap, one would likely use pmap_pte_quick. 2149 * But that isn't as quick as vtopte. 2150 */ 2151 pte = vtopte(va); 2152 if (*pte) { 2153 if (mpte != NULL) { 2154 pmap_unwire_pte_hold(pmap, mpte); 2155 mpte = NULL; 2156 } 2157 goto out; 2158 } 2159 2160 /* 2161 * Enter on the PV list if part of our managed memory. Note that we 2162 * raise IPL while manipulating pv_table since pmap_enter can be 2163 * called at interrupt time. 2164 */ 2165 if ((m->flags & (PG_FICTITIOUS|PG_UNMANAGED)) == 0) 2166 pmap_insert_entry(pmap, va, m); 2167 2168 /* 2169 * Increment counters 2170 */ 2171 pmap->pm_stats.resident_count++; 2172 2173 pa = VM_PAGE_TO_PHYS(m); 2174 2175 /* 2176 * Now validate mapping with RO protection 2177 */ 2178 if (m->flags & (PG_FICTITIOUS|PG_UNMANAGED)) 2179 pte_store(pte, pa | PG_V | PG_U); 2180 else 2181 pte_store(pte, pa | PG_V | PG_U | PG_MANAGED); 2182out: 2183 PMAP_UNLOCK(pmap); 2184 return mpte; 2185} 2186 2187/* 2188 * Make a temporary mapping for a physical address. This is only intended 2189 * to be used for panic dumps. 2190 */ 2191void * 2192pmap_kenter_temporary(vm_paddr_t pa, int i) 2193{ 2194 vm_offset_t va; 2195 2196 va = (vm_offset_t)crashdumpmap + (i * PAGE_SIZE); 2197 pmap_kenter(va, pa); 2198 invlpg(va); 2199 return ((void *)crashdumpmap); 2200} 2201 2202/* 2203 * This code maps large physical mmap regions into the 2204 * processor address space. Note that some shortcuts 2205 * are taken, but the code works. 2206 */ 2207void 2208pmap_object_init_pt(pmap_t pmap, vm_offset_t addr, 2209 vm_object_t object, vm_pindex_t pindex, 2210 vm_size_t size) 2211{ 2212 vm_page_t p; 2213 2214 VM_OBJECT_LOCK_ASSERT(object, MA_OWNED); 2215 KASSERT(object->type == OBJT_DEVICE, 2216 ("pmap_object_init_pt: non-device object")); 2217 if (pseflag && 2218 ((addr & (NBPDR - 1)) == 0) && ((size & (NBPDR - 1)) == 0)) { 2219 int i; 2220 vm_page_t m[1]; 2221 unsigned int ptepindex; 2222 int npdes; 2223 pd_entry_t ptepa; 2224 2225 PMAP_LOCK(pmap); 2226 if (pmap->pm_pdir[ptepindex = (addr >> PDRSHIFT)]) 2227 goto out; 2228 PMAP_UNLOCK(pmap); 2229retry: 2230 p = vm_page_lookup(object, pindex); 2231 if (p != NULL) { 2232 vm_page_lock_queues(); 2233 if (vm_page_sleep_if_busy(p, FALSE, "init4p")) 2234 goto retry; 2235 } else { 2236 p = vm_page_alloc(object, pindex, VM_ALLOC_NORMAL); 2237 if (p == NULL) 2238 return; 2239 m[0] = p; 2240 2241 if (vm_pager_get_pages(object, m, 1, 0) != VM_PAGER_OK) { 2242 vm_page_lock_queues(); 2243 vm_page_free(p); 2244 vm_page_unlock_queues(); 2245 return; 2246 } 2247 2248 p = vm_page_lookup(object, pindex); 2249 vm_page_lock_queues(); 2250 vm_page_wakeup(p); 2251 } 2252 vm_page_unlock_queues(); 2253 2254 ptepa = VM_PAGE_TO_PHYS(p); 2255 if (ptepa & (NBPDR - 1)) 2256 return; 2257 2258 p->valid = VM_PAGE_BITS_ALL; 2259 2260 PMAP_LOCK(pmap); 2261 pmap->pm_stats.resident_count += size >> PAGE_SHIFT; 2262 npdes = size >> PDRSHIFT; 2263 for(i = 0; i < npdes; i++) { 2264 pde_store(&pmap->pm_pdir[ptepindex], 2265 ptepa | PG_U | PG_RW | PG_V | PG_PS); 2266 ptepa += NBPDR; 2267 ptepindex += 1; 2268 } 2269 pmap_invalidate_all(pmap); 2270out: 2271 PMAP_UNLOCK(pmap); 2272 } 2273} 2274 2275/* 2276 * Routine: pmap_change_wiring 2277 * Function: Change the wiring attribute for a map/virtual-address 2278 * pair. 2279 * In/out conditions: 2280 * The mapping must already exist in the pmap. 2281 */ 2282void 2283pmap_change_wiring(pmap, va, wired) 2284 register pmap_t pmap; 2285 vm_offset_t va; 2286 boolean_t wired; 2287{ 2288 register pt_entry_t *pte; 2289 2290 PMAP_LOCK(pmap); 2291 pte = pmap_pte(pmap, va); 2292 2293 if (wired && !pmap_pte_w(pte)) 2294 pmap->pm_stats.wired_count++; 2295 else if (!wired && pmap_pte_w(pte)) 2296 pmap->pm_stats.wired_count--; 2297 2298 /* 2299 * Wiring is not a hardware characteristic so there is no need to 2300 * invalidate TLB. 2301 */ 2302 pmap_pte_set_w(pte, wired); 2303 pmap_pte_release(pte); 2304 PMAP_UNLOCK(pmap); 2305} 2306 2307 2308 2309/* 2310 * Copy the range specified by src_addr/len 2311 * from the source map to the range dst_addr/len 2312 * in the destination map. 2313 * 2314 * This routine is only advisory and need not do anything. 2315 */ 2316 2317void 2318pmap_copy(pmap_t dst_pmap, pmap_t src_pmap, vm_offset_t dst_addr, vm_size_t len, 2319 vm_offset_t src_addr) 2320{ 2321 vm_offset_t addr; 2322 vm_offset_t end_addr = src_addr + len; 2323 vm_offset_t pdnxt; 2324 vm_page_t m; 2325 2326 if (dst_addr != src_addr) 2327 return; 2328 2329 if (!pmap_is_current(src_pmap)) 2330 return; 2331 2332 vm_page_lock_queues(); 2333 if (dst_pmap < src_pmap) { 2334 PMAP_LOCK(dst_pmap); 2335 PMAP_LOCK(src_pmap); 2336 } else { 2337 PMAP_LOCK(src_pmap); 2338 PMAP_LOCK(dst_pmap); 2339 } 2340 sched_pin(); 2341 for (addr = src_addr; addr < end_addr; addr = pdnxt) { 2342 pt_entry_t *src_pte, *dst_pte; 2343 vm_page_t dstmpte, srcmpte; 2344 pd_entry_t srcptepaddr; 2345 unsigned ptepindex; 2346 2347 if (addr >= UPT_MIN_ADDRESS) 2348 panic("pmap_copy: invalid to pmap_copy page tables"); 2349 2350 /* 2351 * Don't let optional prefaulting of pages make us go 2352 * way below the low water mark of free pages or way 2353 * above high water mark of used pv entries. 2354 */ 2355 if (cnt.v_free_count < cnt.v_free_reserved || 2356 pv_entry_count > pv_entry_high_water) 2357 break; 2358 2359 pdnxt = (addr + NBPDR) & ~PDRMASK; 2360 ptepindex = addr >> PDRSHIFT; 2361 2362 srcptepaddr = src_pmap->pm_pdir[ptepindex]; 2363 if (srcptepaddr == 0) 2364 continue; 2365 2366 if (srcptepaddr & PG_PS) { 2367 if (dst_pmap->pm_pdir[ptepindex] == 0) { 2368 dst_pmap->pm_pdir[ptepindex] = srcptepaddr; 2369 dst_pmap->pm_stats.resident_count += 2370 NBPDR / PAGE_SIZE; 2371 } 2372 continue; 2373 } 2374 2375 srcmpte = PHYS_TO_VM_PAGE(srcptepaddr); 2376 if (srcmpte->wire_count == 0) 2377 panic("pmap_copy: source page table page is unused"); 2378 2379 if (pdnxt > end_addr) 2380 pdnxt = end_addr; 2381 2382 src_pte = vtopte(addr); 2383 while (addr < pdnxt) { 2384 pt_entry_t ptetemp; 2385 ptetemp = *src_pte; 2386 /* 2387 * we only virtual copy managed pages 2388 */ 2389 if ((ptetemp & PG_MANAGED) != 0) { 2390 /* 2391 * We have to check after allocpte for the 2392 * pte still being around... allocpte can 2393 * block. 2394 */ 2395 dstmpte = pmap_allocpte(dst_pmap, addr, 2396 M_NOWAIT); 2397 if (dstmpte == NULL) 2398 break; 2399 dst_pte = pmap_pte_quick(dst_pmap, addr); 2400 if (*dst_pte == 0) { 2401 /* 2402 * Clear the modified and 2403 * accessed (referenced) bits 2404 * during the copy. 2405 */ 2406 m = PHYS_TO_VM_PAGE(ptetemp); 2407 *dst_pte = ptetemp & ~(PG_M | PG_A); 2408 dst_pmap->pm_stats.resident_count++; 2409 pmap_insert_entry(dst_pmap, addr, m); 2410 } else 2411 pmap_unwire_pte_hold(dst_pmap, dstmpte); 2412 if (dstmpte->wire_count >= srcmpte->wire_count) 2413 break; 2414 } 2415 addr += PAGE_SIZE; 2416 src_pte++; 2417 } 2418 } 2419 sched_unpin(); 2420 vm_page_unlock_queues(); 2421 PMAP_UNLOCK(src_pmap); 2422 PMAP_UNLOCK(dst_pmap); 2423} 2424 2425static __inline void 2426pagezero(void *page) 2427{ 2428#if defined(I686_CPU) 2429 if (cpu_class == CPUCLASS_686) { 2430#if defined(CPU_ENABLE_SSE) 2431 if (cpu_feature & CPUID_SSE2) 2432 sse2_pagezero(page); 2433 else 2434#endif 2435 i686_pagezero(page); 2436 } else 2437#endif 2438 bzero(page, PAGE_SIZE); 2439} 2440 2441/* 2442 * pmap_zero_page zeros the specified hardware page by mapping 2443 * the page into KVM and using bzero to clear its contents. 2444 */ 2445void 2446pmap_zero_page(vm_page_t m) 2447{ 2448 struct sysmaps *sysmaps; 2449 2450 sysmaps = &sysmaps_pcpu[PCPU_GET(cpuid)]; 2451 mtx_lock(&sysmaps->lock); 2452 if (*sysmaps->CMAP2) 2453 panic("pmap_zero_page: CMAP2 busy"); 2454 sched_pin(); 2455 *sysmaps->CMAP2 = PG_V | PG_RW | VM_PAGE_TO_PHYS(m) | PG_A | PG_M; 2456 invlcaddr(sysmaps->CADDR2); 2457 pagezero(sysmaps->CADDR2); 2458 *sysmaps->CMAP2 = 0; 2459 sched_unpin(); 2460 mtx_unlock(&sysmaps->lock); 2461} 2462 2463/* 2464 * pmap_zero_page_area zeros the specified hardware page by mapping 2465 * the page into KVM and using bzero to clear its contents. 2466 * 2467 * off and size may not cover an area beyond a single hardware page. 2468 */ 2469void 2470pmap_zero_page_area(vm_page_t m, int off, int size) 2471{ 2472 struct sysmaps *sysmaps; 2473 2474 sysmaps = &sysmaps_pcpu[PCPU_GET(cpuid)]; 2475 mtx_lock(&sysmaps->lock); 2476 if (*sysmaps->CMAP2) 2477 panic("pmap_zero_page: CMAP2 busy"); 2478 sched_pin(); 2479 *sysmaps->CMAP2 = PG_V | PG_RW | VM_PAGE_TO_PHYS(m) | PG_A | PG_M; 2480 invlcaddr(sysmaps->CADDR2); 2481 if (off == 0 && size == PAGE_SIZE) 2482 pagezero(sysmaps->CADDR2); 2483 else 2484 bzero((char *)sysmaps->CADDR2 + off, size); 2485 *sysmaps->CMAP2 = 0; 2486 sched_unpin(); 2487 mtx_unlock(&sysmaps->lock); 2488} 2489 2490/* 2491 * pmap_zero_page_idle zeros the specified hardware page by mapping 2492 * the page into KVM and using bzero to clear its contents. This 2493 * is intended to be called from the vm_pagezero process only and 2494 * outside of Giant. 2495 */ 2496void 2497pmap_zero_page_idle(vm_page_t m) 2498{ 2499 2500 if (*CMAP3) 2501 panic("pmap_zero_page: CMAP3 busy"); 2502 sched_pin(); 2503 *CMAP3 = PG_V | PG_RW | VM_PAGE_TO_PHYS(m) | PG_A | PG_M; 2504 invlcaddr(CADDR3); 2505 pagezero(CADDR3); 2506 *CMAP3 = 0; 2507 sched_unpin(); 2508} 2509 2510/* 2511 * pmap_copy_page copies the specified (machine independent) 2512 * page by mapping the page into virtual memory and using 2513 * bcopy to copy the page, one machine dependent page at a 2514 * time. 2515 */ 2516void 2517pmap_copy_page(vm_page_t src, vm_page_t dst) 2518{ 2519 struct sysmaps *sysmaps; 2520 2521 sysmaps = &sysmaps_pcpu[PCPU_GET(cpuid)]; 2522 mtx_lock(&sysmaps->lock); 2523 if (*sysmaps->CMAP1) 2524 panic("pmap_copy_page: CMAP1 busy"); 2525 if (*sysmaps->CMAP2) 2526 panic("pmap_copy_page: CMAP2 busy"); 2527 sched_pin(); 2528 invlpg((u_int)sysmaps->CADDR1); 2529 invlpg((u_int)sysmaps->CADDR2); 2530 *sysmaps->CMAP1 = PG_V | VM_PAGE_TO_PHYS(src) | PG_A; 2531 *sysmaps->CMAP2 = PG_V | PG_RW | VM_PAGE_TO_PHYS(dst) | PG_A | PG_M; 2532 bcopy(sysmaps->CADDR1, sysmaps->CADDR2, PAGE_SIZE); 2533 *sysmaps->CMAP1 = 0; 2534 *sysmaps->CMAP2 = 0; 2535 sched_unpin(); 2536 mtx_unlock(&sysmaps->lock); 2537} 2538 2539/* 2540 * Returns true if the pmap's pv is one of the first 2541 * 16 pvs linked to from this page. This count may 2542 * be changed upwards or downwards in the future; it 2543 * is only necessary that true be returned for a small 2544 * subset of pmaps for proper page aging. 2545 */ 2546boolean_t 2547pmap_page_exists_quick(pmap, m) 2548 pmap_t pmap; 2549 vm_page_t m; 2550{ 2551 pv_entry_t pv; 2552 int loops = 0; 2553 2554 if (m->flags & PG_FICTITIOUS) 2555 return FALSE; 2556 2557 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 2558 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 2559 if (pv->pv_pmap == pmap) { 2560 return TRUE; 2561 } 2562 loops++; 2563 if (loops >= 16) 2564 break; 2565 } 2566 return (FALSE); 2567} 2568 2569#define PMAP_REMOVE_PAGES_CURPROC_ONLY 2570/* 2571 * Remove all pages from specified address space 2572 * this aids process exit speeds. Also, this code 2573 * is special cased for current process only, but 2574 * can have the more generic (and slightly slower) 2575 * mode enabled. This is much faster than pmap_remove 2576 * in the case of running down an entire address space. 2577 */ 2578void 2579pmap_remove_pages(pmap, sva, eva) 2580 pmap_t pmap; 2581 vm_offset_t sva, eva; 2582{ 2583 pt_entry_t *pte, tpte; 2584 vm_page_t m; 2585 pv_entry_t pv, npv; 2586 2587#ifdef PMAP_REMOVE_PAGES_CURPROC_ONLY 2588 if (pmap != vmspace_pmap(curthread->td_proc->p_vmspace)) { 2589 printf("warning: pmap_remove_pages called with non-current pmap\n"); 2590 return; 2591 } 2592#endif 2593 vm_page_lock_queues(); 2594 PMAP_LOCK(pmap); 2595 sched_pin(); 2596 for (pv = TAILQ_FIRST(&pmap->pm_pvlist); pv; pv = npv) { 2597 2598 if (pv->pv_va >= eva || pv->pv_va < sva) { 2599 npv = TAILQ_NEXT(pv, pv_plist); 2600 continue; 2601 } 2602 2603#ifdef PMAP_REMOVE_PAGES_CURPROC_ONLY 2604 pte = vtopte(pv->pv_va); 2605#else 2606 pte = pmap_pte_quick(pmap, pv->pv_va); 2607#endif 2608 tpte = *pte; 2609 2610 if (tpte == 0) { 2611 printf("TPTE at %p IS ZERO @ VA %08x\n", 2612 pte, pv->pv_va); 2613 panic("bad pte"); 2614 } 2615 2616/* 2617 * We cannot remove wired pages from a process' mapping at this time 2618 */ 2619 if (tpte & PG_W) { 2620 npv = TAILQ_NEXT(pv, pv_plist); 2621 continue; 2622 } 2623 2624 m = PHYS_TO_VM_PAGE(tpte); 2625 KASSERT(m->phys_addr == (tpte & PG_FRAME), 2626 ("vm_page_t %p phys_addr mismatch %016jx %016jx", 2627 m, (uintmax_t)m->phys_addr, (uintmax_t)tpte)); 2628 2629 KASSERT(m < &vm_page_array[vm_page_array_size], 2630 ("pmap_remove_pages: bad tpte %#jx", (uintmax_t)tpte)); 2631 2632 pmap->pm_stats.resident_count--; 2633 2634 pte_clear(pte); 2635 2636 /* 2637 * Update the vm_page_t clean and reference bits. 2638 */ 2639 if (tpte & PG_M) { 2640 vm_page_dirty(m); 2641 } 2642 2643 npv = TAILQ_NEXT(pv, pv_plist); 2644 TAILQ_REMOVE(&pmap->pm_pvlist, pv, pv_plist); 2645 2646 m->md.pv_list_count--; 2647 TAILQ_REMOVE(&m->md.pv_list, pv, pv_list); 2648 if (TAILQ_EMPTY(&m->md.pv_list)) 2649 vm_page_flag_clear(m, PG_WRITEABLE); 2650 2651 pmap_unuse_pt(pmap, pv->pv_va); 2652 free_pv_entry(pv); 2653 } 2654 sched_unpin(); 2655 pmap_invalidate_all(pmap); 2656 PMAP_UNLOCK(pmap); 2657 vm_page_unlock_queues(); 2658} 2659 2660/* 2661 * pmap_is_modified: 2662 * 2663 * Return whether or not the specified physical page was modified 2664 * in any physical maps. 2665 */ 2666boolean_t 2667pmap_is_modified(vm_page_t m) 2668{ 2669 pv_entry_t pv; 2670 pt_entry_t *pte; 2671 boolean_t rv; 2672 2673 rv = FALSE; 2674 if (m->flags & PG_FICTITIOUS) 2675 return (rv); 2676 2677 sched_pin(); 2678 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 2679 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 2680 /* 2681 * if the bit being tested is the modified bit, then 2682 * mark clean_map and ptes as never 2683 * modified. 2684 */ 2685 if (!pmap_track_modified(pv->pv_va)) 2686 continue; 2687 PMAP_LOCK(pv->pv_pmap); 2688 pte = pmap_pte_quick(pv->pv_pmap, pv->pv_va); 2689 rv = (*pte & PG_M) != 0; 2690 PMAP_UNLOCK(pv->pv_pmap); 2691 if (rv) 2692 break; 2693 } 2694 sched_unpin(); 2695 return (rv); 2696} 2697 2698/* 2699 * pmap_is_prefaultable: 2700 * 2701 * Return whether or not the specified virtual address is elgible 2702 * for prefault. 2703 */ 2704boolean_t 2705pmap_is_prefaultable(pmap_t pmap, vm_offset_t addr) 2706{ 2707 pt_entry_t *pte; 2708 boolean_t rv; 2709 2710 rv = FALSE; 2711 PMAP_LOCK(pmap); 2712 if (*pmap_pde(pmap, addr)) { 2713 pte = vtopte(addr); 2714 rv = *pte == 0; 2715 } 2716 PMAP_UNLOCK(pmap); 2717 return (rv); 2718} 2719 2720/* 2721 * Clear the given bit in each of the given page's ptes. The bit is 2722 * expressed as a 32-bit mask. Consequently, if the pte is 64 bits in 2723 * size, only a bit within the least significant 32 can be cleared. 2724 */ 2725static __inline void 2726pmap_clear_ptes(vm_page_t m, int bit) 2727{ 2728 register pv_entry_t pv; 2729 pt_entry_t pbits, *pte; 2730 2731 if ((m->flags & PG_FICTITIOUS) || 2732 (bit == PG_RW && (m->flags & PG_WRITEABLE) == 0)) 2733 return; 2734 2735 sched_pin(); 2736 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 2737 /* 2738 * Loop over all current mappings setting/clearing as appropos If 2739 * setting RO do we need to clear the VAC? 2740 */ 2741 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 2742 /* 2743 * don't write protect pager mappings 2744 */ 2745 if (bit == PG_RW) { 2746 if (!pmap_track_modified(pv->pv_va)) 2747 continue; 2748 } 2749 2750 PMAP_LOCK(pv->pv_pmap); 2751 pte = pmap_pte_quick(pv->pv_pmap, pv->pv_va); 2752retry: 2753 pbits = *pte; 2754 if (pbits & bit) { 2755 if (bit == PG_RW) { 2756 /* 2757 * Regardless of whether a pte is 32 or 64 bits 2758 * in size, PG_RW and PG_M are among the least 2759 * significant 32 bits. 2760 */ 2761 if (!atomic_cmpset_int((u_int *)pte, pbits, 2762 pbits & ~(PG_RW | PG_M))) 2763 goto retry; 2764 if (pbits & PG_M) { 2765 vm_page_dirty(m); 2766 } 2767 } else { 2768 atomic_clear_int((u_int *)pte, bit); 2769 } 2770 pmap_invalidate_page(pv->pv_pmap, pv->pv_va); 2771 } 2772 PMAP_UNLOCK(pv->pv_pmap); 2773 } 2774 if (bit == PG_RW) 2775 vm_page_flag_clear(m, PG_WRITEABLE); 2776 sched_unpin(); 2777} 2778 2779/* 2780 * pmap_page_protect: 2781 * 2782 * Lower the permission for all mappings to a given page. 2783 */ 2784void 2785pmap_page_protect(vm_page_t m, vm_prot_t prot) 2786{ 2787 if ((prot & VM_PROT_WRITE) == 0) { 2788 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { 2789 pmap_clear_ptes(m, PG_RW); 2790 } else { 2791 pmap_remove_all(m); 2792 } 2793 } 2794} 2795 2796/* 2797 * pmap_ts_referenced: 2798 * 2799 * Return a count of reference bits for a page, clearing those bits. 2800 * It is not necessary for every reference bit to be cleared, but it 2801 * is necessary that 0 only be returned when there are truly no 2802 * reference bits set. 2803 * 2804 * XXX: The exact number of bits to check and clear is a matter that 2805 * should be tested and standardized at some point in the future for 2806 * optimal aging of shared pages. 2807 */ 2808int 2809pmap_ts_referenced(vm_page_t m) 2810{ 2811 register pv_entry_t pv, pvf, pvn; 2812 pt_entry_t *pte; 2813 pt_entry_t v; 2814 int rtval = 0; 2815 2816 if (m->flags & PG_FICTITIOUS) 2817 return (rtval); 2818 2819 sched_pin(); 2820 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 2821 if ((pv = TAILQ_FIRST(&m->md.pv_list)) != NULL) { 2822 2823 pvf = pv; 2824 2825 do { 2826 pvn = TAILQ_NEXT(pv, pv_list); 2827 2828 TAILQ_REMOVE(&m->md.pv_list, pv, pv_list); 2829 2830 TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list); 2831 2832 if (!pmap_track_modified(pv->pv_va)) 2833 continue; 2834 2835 PMAP_LOCK(pv->pv_pmap); 2836 pte = pmap_pte_quick(pv->pv_pmap, pv->pv_va); 2837 2838 if (pte && ((v = pte_load(pte)) & PG_A) != 0) { 2839 atomic_clear_int((u_int *)pte, PG_A); 2840 pmap_invalidate_page(pv->pv_pmap, pv->pv_va); 2841 2842 rtval++; 2843 if (rtval > 4) { 2844 PMAP_UNLOCK(pv->pv_pmap); 2845 break; 2846 } 2847 } 2848 PMAP_UNLOCK(pv->pv_pmap); 2849 } while ((pv = pvn) != NULL && pv != pvf); 2850 } 2851 sched_unpin(); 2852 2853 return (rtval); 2854} 2855 2856/* 2857 * Clear the modify bits on the specified physical page. 2858 */ 2859void 2860pmap_clear_modify(vm_page_t m) 2861{ 2862 pmap_clear_ptes(m, PG_M); 2863} 2864 2865/* 2866 * pmap_clear_reference: 2867 * 2868 * Clear the reference bit on the specified physical page. 2869 */ 2870void 2871pmap_clear_reference(vm_page_t m) 2872{ 2873 pmap_clear_ptes(m, PG_A); 2874} 2875 2876/* 2877 * Miscellaneous support routines follow 2878 */ 2879 2880/* 2881 * Map a set of physical memory pages into the kernel virtual 2882 * address space. Return a pointer to where it is mapped. This 2883 * routine is intended to be used for mapping device memory, 2884 * NOT real memory. 2885 */ 2886void * 2887pmap_mapdev(pa, size) 2888 vm_paddr_t pa; 2889 vm_size_t size; 2890{ 2891 vm_offset_t va, tmpva, offset; 2892 2893 offset = pa & PAGE_MASK; 2894 size = roundup(offset + size, PAGE_SIZE); 2895 pa = pa & PG_FRAME; 2896 2897 if (pa < KERNLOAD && pa + size <= KERNLOAD) 2898 va = KERNBASE + pa; 2899 else 2900 va = kmem_alloc_nofault(kernel_map, size); 2901 if (!va) 2902 panic("pmap_mapdev: Couldn't alloc kernel virtual memory"); 2903 2904 for (tmpva = va; size > 0; ) { 2905 pmap_kenter(tmpva, pa); 2906 size -= PAGE_SIZE; 2907 tmpva += PAGE_SIZE; 2908 pa += PAGE_SIZE; 2909 } 2910 pmap_invalidate_range(kernel_pmap, va, tmpva); 2911 return ((void *)(va + offset)); 2912} 2913 2914void 2915pmap_unmapdev(va, size) 2916 vm_offset_t va; 2917 vm_size_t size; 2918{ 2919 vm_offset_t base, offset, tmpva; 2920 2921 if (va >= KERNBASE && va + size <= KERNBASE + KERNLOAD) 2922 return; 2923 base = va & PG_FRAME; 2924 offset = va & PAGE_MASK; 2925 size = roundup(offset + size, PAGE_SIZE); 2926 for (tmpva = base; tmpva < (base + size); tmpva += PAGE_SIZE) 2927 pmap_kremove(tmpva); 2928 pmap_invalidate_range(kernel_pmap, va, tmpva); 2929 kmem_free(kernel_map, base, size); 2930} 2931 2932/* 2933 * perform the pmap work for mincore 2934 */ 2935int 2936pmap_mincore(pmap, addr) 2937 pmap_t pmap; 2938 vm_offset_t addr; 2939{ 2940 pt_entry_t *ptep, pte; 2941 vm_page_t m; 2942 int val = 0; 2943 2944 PMAP_LOCK(pmap); 2945 ptep = pmap_pte(pmap, addr); 2946 pte = (ptep != NULL) ? *ptep : 0; 2947 pmap_pte_release(ptep); 2948 PMAP_UNLOCK(pmap); 2949 2950 if (pte != 0) { 2951 vm_paddr_t pa; 2952 2953 val = MINCORE_INCORE; 2954 if ((pte & PG_MANAGED) == 0) 2955 return val; 2956 2957 pa = pte & PG_FRAME; 2958 2959 m = PHYS_TO_VM_PAGE(pa); 2960 2961 /* 2962 * Modified by us 2963 */ 2964 if (pte & PG_M) 2965 val |= MINCORE_MODIFIED|MINCORE_MODIFIED_OTHER; 2966 else { 2967 /* 2968 * Modified by someone else 2969 */ 2970 vm_page_lock_queues(); 2971 if (m->dirty || pmap_is_modified(m)) 2972 val |= MINCORE_MODIFIED_OTHER; 2973 vm_page_unlock_queues(); 2974 } 2975 /* 2976 * Referenced by us 2977 */ 2978 if (pte & PG_A) 2979 val |= MINCORE_REFERENCED|MINCORE_REFERENCED_OTHER; 2980 else { 2981 /* 2982 * Referenced by someone else 2983 */ 2984 vm_page_lock_queues(); 2985 if ((m->flags & PG_REFERENCED) || 2986 pmap_ts_referenced(m)) { 2987 val |= MINCORE_REFERENCED_OTHER; 2988 vm_page_flag_set(m, PG_REFERENCED); 2989 } 2990 vm_page_unlock_queues(); 2991 } 2992 } 2993 return val; 2994} 2995 2996void 2997pmap_activate(struct thread *td) 2998{ 2999 struct proc *p = td->td_proc; 3000 pmap_t pmap, oldpmap; 3001 u_int32_t cr3; 3002 3003 critical_enter(); 3004 pmap = vmspace_pmap(td->td_proc->p_vmspace); 3005 oldpmap = PCPU_GET(curpmap); 3006#if defined(SMP) 3007 atomic_clear_int(&oldpmap->pm_active, PCPU_GET(cpumask)); 3008 atomic_set_int(&pmap->pm_active, PCPU_GET(cpumask)); 3009#else 3010 oldpmap->pm_active &= ~1; 3011 pmap->pm_active |= 1; 3012#endif 3013#ifdef PAE 3014 cr3 = vtophys(pmap->pm_pdpt); 3015#else 3016 cr3 = vtophys(pmap->pm_pdir); 3017#endif 3018 /* XXXKSE this is wrong. 3019 * pmap_activate is for the current thread on the current cpu 3020 */ 3021 if (p->p_flag & P_SA) { 3022 /* Make sure all other cr3 entries are updated. */ 3023 /* what if they are running? XXXKSE (maybe abort them) */ 3024 FOREACH_THREAD_IN_PROC(p, td) { 3025 td->td_pcb->pcb_cr3 = cr3; 3026 } 3027 } else { 3028 td->td_pcb->pcb_cr3 = cr3; 3029 } 3030 load_cr3(cr3); 3031 PCPU_SET(curpmap, pmap); 3032 critical_exit(); 3033} 3034 3035vm_offset_t 3036pmap_addr_hint(vm_object_t obj, vm_offset_t addr, vm_size_t size) 3037{ 3038 3039 if ((obj == NULL) || (size < NBPDR) || (obj->type != OBJT_DEVICE)) { 3040 return addr; 3041 } 3042 3043 addr = (addr + PDRMASK) & ~PDRMASK; 3044 return addr; 3045} 3046 3047 3048#if defined(PMAP_DEBUG) 3049pmap_pid_dump(int pid) 3050{ 3051 pmap_t pmap; 3052 struct proc *p; 3053 int npte = 0; 3054 int index; 3055 3056 sx_slock(&allproc_lock); 3057 LIST_FOREACH(p, &allproc, p_list) { 3058 if (p->p_pid != pid) 3059 continue; 3060 3061 if (p->p_vmspace) { 3062 int i,j; 3063 index = 0; 3064 pmap = vmspace_pmap(p->p_vmspace); 3065 for (i = 0; i < NPDEPTD; i++) { 3066 pd_entry_t *pde; 3067 pt_entry_t *pte; 3068 vm_offset_t base = i << PDRSHIFT; 3069 3070 pde = &pmap->pm_pdir[i]; 3071 if (pde && pmap_pde_v(pde)) { 3072 for (j = 0; j < NPTEPG; j++) { 3073 vm_offset_t va = base + (j << PAGE_SHIFT); 3074 if (va >= (vm_offset_t) VM_MIN_KERNEL_ADDRESS) { 3075 if (index) { 3076 index = 0; 3077 printf("\n"); 3078 } 3079 sx_sunlock(&allproc_lock); 3080 return npte; 3081 } 3082 pte = pmap_pte(pmap, va); 3083 if (pte && pmap_pte_v(pte)) { 3084 pt_entry_t pa; 3085 vm_page_t m; 3086 pa = *pte; 3087 m = PHYS_TO_VM_PAGE(pa); 3088 printf("va: 0x%x, pt: 0x%x, h: %d, w: %d, f: 0x%x", 3089 va, pa, m->hold_count, m->wire_count, m->flags); 3090 npte++; 3091 index++; 3092 if (index >= 2) { 3093 index = 0; 3094 printf("\n"); 3095 } else { 3096 printf(" "); 3097 } 3098 } 3099 } 3100 } 3101 } 3102 } 3103 } 3104 sx_sunlock(&allproc_lock); 3105 return npte; 3106} 3107#endif 3108 3109#if defined(DEBUG) 3110 3111static void pads(pmap_t pm); 3112void pmap_pvdump(vm_offset_t pa); 3113 3114/* print address space of pmap*/ 3115static void 3116pads(pm) 3117 pmap_t pm; 3118{ 3119 int i, j; 3120 vm_paddr_t va; 3121 pt_entry_t *ptep; 3122 3123 if (pm == kernel_pmap) 3124 return; 3125 for (i = 0; i < NPDEPTD; i++) 3126 if (pm->pm_pdir[i]) 3127 for (j = 0; j < NPTEPG; j++) { 3128 va = (i << PDRSHIFT) + (j << PAGE_SHIFT); 3129 if (pm == kernel_pmap && va < KERNBASE) 3130 continue; 3131 if (pm != kernel_pmap && va > UPT_MAX_ADDRESS) 3132 continue; 3133 ptep = pmap_pte(pm, va); 3134 if (pmap_pte_v(ptep)) 3135 printf("%x:%x ", va, *ptep); 3136 }; 3137 3138} 3139 3140void 3141pmap_pvdump(pa) 3142 vm_paddr_t pa; 3143{ 3144 pv_entry_t pv; 3145 vm_page_t m; 3146 3147 printf("pa %x", pa); 3148 m = PHYS_TO_VM_PAGE(pa); 3149 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 3150 printf(" -> pmap %p, va %x", (void *)pv->pv_pmap, pv->pv_va); 3151 pads(pv->pv_pmap); 3152 } 3153 printf(" "); 3154} 3155#endif 3156