4 * Copyright (c) 1991 Regents of the University of California.
6 * Copyright (c) 1994 John S. Dyson
8 * Copyright (c) 1994 David Greenman
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.
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
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.
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
43 * from: @(#)pmap.c 7.7 (Berkeley) 5/12/91
44 * $FreeBSD: src/sys/i386/i386/pmap.c,v 1.250.2.18 2002/03/06 22:48:53 silby Exp $
48 * Manages physical address maps.
50 * In most cases we hold page table pages busy in order to manipulate them.
53 * PMAP_DEBUG - see platform/pc32/include/pmap.h
56 #include "opt_disable_pse.h"
58 #include "opt_msgbuf.h"
60 #include <sys/param.h>
61 #include <sys/systm.h>
62 #include <sys/kernel.h>
64 #include <sys/msgbuf.h>
65 #include <sys/vmmeter.h>
67 #include <sys/thread.h>
70 #include <vm/vm_param.h>
71 #include <sys/sysctl.h>
73 #include <vm/vm_kern.h>
74 #include <vm/vm_page.h>
75 #include <vm/vm_map.h>
76 #include <vm/vm_object.h>
77 #include <vm/vm_extern.h>
78 #include <vm/vm_pageout.h>
79 #include <vm/vm_pager.h>
80 #include <vm/vm_zone.h>
83 #include <sys/thread2.h>
84 #include <sys/sysref2.h>
85 #include <sys/spinlock2.h>
86 #include <vm/vm_page2.h>
88 #include <machine/cputypes.h>
89 #include <machine/md_var.h>
90 #include <machine/specialreg.h>
91 #include <machine/smp.h>
92 #include <machine_base/apic/apicreg.h>
93 #include <machine/globaldata.h>
94 #include <machine/pmap.h>
95 #include <machine/pmap_inval.h>
97 #define PMAP_KEEP_PDIRS
98 #ifndef PMAP_SHPGPERPROC
99 #define PMAP_SHPGPERPROC 200
100 #define PMAP_PVLIMIT 1400000 /* i386 kvm problems */
103 #if defined(DIAGNOSTIC)
104 #define PMAP_DIAGNOSTIC
109 #if !defined(PMAP_DIAGNOSTIC)
110 #define PMAP_INLINE __inline
116 * Get PDEs and PTEs for user/kernel address space
118 #define pmap_pde(m, v) (&((m)->pm_pdir[(vm_offset_t)(v) >> PDRSHIFT]))
119 #define pdir_pde(m, v) (m[(vm_offset_t)(v) >> PDRSHIFT])
121 #define pmap_pde_v(pte) ((*(int *)pte & PG_V) != 0)
122 #define pmap_pte_w(pte) ((*(int *)pte & PG_W) != 0)
123 #define pmap_pte_m(pte) ((*(int *)pte & PG_M) != 0)
124 #define pmap_pte_u(pte) ((*(int *)pte & PG_A) != 0)
125 #define pmap_pte_v(pte) ((*(int *)pte & PG_V) != 0)
128 * Given a map and a machine independent protection code,
129 * convert to a vax protection code.
131 #define pte_prot(m, p) \
132 (protection_codes[p & (VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE)])
133 static int protection_codes[8];
135 struct pmap kernel_pmap;
136 static TAILQ_HEAD(,pmap) pmap_list = TAILQ_HEAD_INITIALIZER(pmap_list);
138 vm_paddr_t avail_start; /* PA of first available physical page */
139 vm_paddr_t avail_end; /* PA of last available physical page */
140 vm_offset_t virtual_start; /* VA of first avail page (after kernel bss) */
141 vm_offset_t virtual_end; /* VA of last avail page (end of kernel AS) */
142 vm_offset_t virtual2_start;
143 vm_offset_t virtual2_end;
144 vm_offset_t KvaStart; /* VA start of KVA space */
145 vm_offset_t KvaEnd; /* VA end of KVA space (non-inclusive) */
146 vm_offset_t KvaSize; /* max size of kernel virtual address space */
147 static boolean_t pmap_initialized = FALSE; /* Has pmap_init completed? */
148 static int pgeflag; /* PG_G or-in */
149 static int pseflag; /* PG_PS or-in */
151 static vm_object_t kptobj;
154 vm_offset_t kernel_vm_end;
157 * Data for the pv entry allocation mechanism
159 static vm_zone_t pvzone;
160 static struct vm_zone pvzone_store;
161 static struct vm_object pvzone_obj;
162 static int pv_entry_count=0, pv_entry_max=0, pv_entry_high_water=0;
163 static int pmap_pagedaemon_waken = 0;
164 static struct pv_entry *pvinit;
167 * Considering all the issues I'm having with pmap caching, if breakage
168 * continues to occur, and for debugging, I've added a sysctl that will
169 * just do an unconditional invltlb.
171 static int dreadful_invltlb;
173 SYSCTL_INT(_vm, OID_AUTO, dreadful_invltlb,
174 CTLFLAG_RW, &dreadful_invltlb, 0, "Debugging sysctl to force invltlb on pmap operations");
177 * All those kernel PT submaps that BSD is so fond of
179 pt_entry_t *CMAP1 = NULL, *ptmmap;
180 caddr_t CADDR1 = NULL, ptvmmap = NULL;
181 static pt_entry_t *msgbufmap;
182 struct msgbuf *msgbufp=NULL;
187 static pt_entry_t *pt_crashdumpmap;
188 static caddr_t crashdumpmap;
190 extern pt_entry_t *SMPpt;
192 static PMAP_INLINE void free_pv_entry (pv_entry_t pv);
193 static unsigned * get_ptbase (pmap_t pmap);
194 static pv_entry_t get_pv_entry (void);
195 static void i386_protection_init (void);
196 static __inline void pmap_clearbit (vm_page_t m, int bit);
198 static void pmap_remove_all (vm_page_t m);
199 static void pmap_remove_pte (struct pmap *pmap, unsigned *ptq,
200 vm_offset_t sva, pmap_inval_info_t info);
201 static void pmap_remove_page (struct pmap *pmap,
202 vm_offset_t va, pmap_inval_info_t info);
203 static void pmap_remove_entry (struct pmap *pmap, vm_page_t m,
204 vm_offset_t va, pmap_inval_info_t info);
205 static boolean_t pmap_testbit (vm_page_t m, int bit);
206 static void pmap_insert_entry (pmap_t pmap, pv_entry_t pv,
207 vm_offset_t va, vm_page_t mpte, vm_page_t m);
209 static vm_page_t pmap_allocpte (pmap_t pmap, vm_offset_t va);
211 static int pmap_release_free_page (pmap_t pmap, vm_page_t p);
212 static vm_page_t _pmap_allocpte (pmap_t pmap, unsigned ptepindex);
213 static unsigned * pmap_pte_quick (pmap_t pmap, vm_offset_t va);
214 static vm_page_t pmap_page_lookup (vm_object_t object, vm_pindex_t pindex);
215 static void pmap_unuse_pt (pmap_t, vm_offset_t, vm_page_t, pmap_inval_info_t);
216 static vm_offset_t pmap_kmem_choose(vm_offset_t addr);
218 static void pmap_hold(pmap_t pmap);
219 static void pmap_drop(pmap_t pmap);
220 static void pmap_wait(pmap_t pmap, int count);
222 static unsigned pdir4mb;
225 * Move the kernel virtual free pointer to the next
226 * 4MB. This is used to help improve performance
227 * by using a large (4MB) page for much of the kernel
228 * (.text, .data, .bss)
232 pmap_kmem_choose(vm_offset_t addr)
234 vm_offset_t newaddr = addr;
236 if (cpu_feature & CPUID_PSE) {
237 newaddr = (addr + (NBPDR - 1)) & ~(NBPDR - 1);
244 * This function returns a pointer to the pte entry in the pmap and has
245 * the side effect of potentially retaining a cached mapping of the pmap.
247 * The caller must hold vm_token and the returned value is only valid
248 * until the caller blocks or releases the token.
252 pmap_pte(pmap_t pmap, vm_offset_t va)
256 ASSERT_LWKT_TOKEN_HELD(&vm_token);
258 pdeaddr = (unsigned *) pmap_pde(pmap, va);
259 if (*pdeaddr & PG_PS)
262 return get_ptbase(pmap) + i386_btop(va);
268 * pmap_pte using the kernel_pmap
270 * Used for debugging, no requirements.
273 pmap_kernel_pte(vm_offset_t va)
277 pdeaddr = (unsigned *) pmap_pde(&kernel_pmap, va);
278 if (*pdeaddr & PG_PS)
281 return (unsigned *)vtopte(va);
288 * Super fast pmap_pte routine best used when scanning the pv lists.
289 * This eliminates many course-grained invltlb calls. Note that many of
290 * the pv list scans are across different pmaps and it is very wasteful
291 * to do an entire invltlb when checking a single mapping.
293 * Should only be called while in a critical section.
295 * The caller must hold vm_token and the returned value is only valid
296 * until the caller blocks or releases the token.
300 pmap_pte_quick(pmap_t pmap, vm_offset_t va)
302 struct mdglobaldata *gd = mdcpu;
305 ASSERT_LWKT_TOKEN_HELD(&vm_token);
306 if ((pde = (unsigned) pmap->pm_pdir[va >> PDRSHIFT]) != 0) {
307 unsigned frame = (unsigned) pmap->pm_pdir[PTDPTDI] & PG_FRAME;
308 unsigned index = i386_btop(va);
309 /* are we current address space or kernel? */
310 if ((pmap == &kernel_pmap) ||
311 (frame == (((unsigned) PTDpde) & PG_FRAME))) {
312 return (unsigned *) PTmap + index;
314 newpf = pde & PG_FRAME;
315 if (((*(unsigned *)gd->gd_PMAP1) & PG_FRAME) != newpf) {
316 *(unsigned *)gd->gd_PMAP1 = newpf | PG_RW | PG_V;
317 cpu_invlpg(gd->gd_PADDR1);
319 return gd->gd_PADDR1 + (index & (NPTEPG - 1));
326 * Bootstrap the system enough to run with virtual memory.
328 * On the i386 this is called after mapping has already been enabled
329 * and just syncs the pmap module with what has already been done.
330 * [We can't call it easily with mapping off since the kernel is not
331 * mapped with PA == VA, hence we would have to relocate every address
332 * from the linked base (virtual) address "KERNBASE" to the actual
333 * (physical) address starting relative to 0]
336 pmap_bootstrap(vm_paddr_t firstaddr, vm_paddr_t loadaddr)
340 struct mdglobaldata *gd;
344 KvaStart = (vm_offset_t)VADDR(PTDPTDI, 0);
345 KvaSize = (vm_offset_t)VADDR(APTDPTDI, 0) - KvaStart;
346 KvaEnd = KvaStart + KvaSize;
348 avail_start = firstaddr;
351 * XXX The calculation of virtual_start is wrong. It's NKPT*PAGE_SIZE
352 * too large. It should instead be correctly calculated in locore.s and
353 * not based on 'first' (which is a physical address, not a virtual
354 * address, for the start of unused physical memory). The kernel
355 * page tables are NOT double mapped and thus should not be included
356 * in this calculation.
358 virtual_start = (vm_offset_t) KERNBASE + firstaddr;
359 virtual_start = pmap_kmem_choose(virtual_start);
360 virtual_end = VADDR(KPTDI+NKPDE-1, NPTEPG-1);
363 * Initialize protection array.
365 i386_protection_init();
368 * The kernel's pmap is statically allocated so we don't have to use
369 * pmap_create, which is unlikely to work correctly at this part of
370 * the boot sequence (XXX and which no longer exists).
372 * The kernel_pmap's pm_pteobj is used only for locking and not
375 kernel_pmap.pm_pdir = (pd_entry_t *)(KERNBASE + (u_int)IdlePTD);
376 kernel_pmap.pm_count = 1;
377 kernel_pmap.pm_active = (cpumask_t)-1 & ~CPUMASK_LOCK;
378 kernel_pmap.pm_pteobj = &kernel_object;
379 TAILQ_INIT(&kernel_pmap.pm_pvlist);
380 TAILQ_INIT(&kernel_pmap.pm_pvlist_free);
381 spin_init(&kernel_pmap.pm_spin);
382 lwkt_token_init(&kernel_pmap.pm_token, "kpmap_tok");
386 * Reserve some special page table entries/VA space for temporary
389 #define SYSMAP(c, p, v, n) \
390 v = (c)va; va += ((n)*PAGE_SIZE); p = pte; pte += (n);
393 pte = (pt_entry_t *) pmap_kernel_pte(va);
396 * CMAP1/CMAP2 are used for zeroing and copying pages.
398 SYSMAP(caddr_t, CMAP1, CADDR1, 1)
403 SYSMAP(caddr_t, pt_crashdumpmap, crashdumpmap, MAXDUMPPGS);
406 * ptvmmap is used for reading arbitrary physical pages via
409 SYSMAP(caddr_t, ptmmap, ptvmmap, 1)
412 * msgbufp is used to map the system message buffer.
413 * XXX msgbufmap is not used.
415 SYSMAP(struct msgbuf *, msgbufmap, msgbufp,
416 atop(round_page(MSGBUF_SIZE)))
421 for (i = 0; i < NKPT; i++)
425 * PG_G is terribly broken on SMP because we IPI invltlb's in some
426 * cases rather then invl1pg. Actually, I don't even know why it
427 * works under UP because self-referential page table mappings
432 * Initialize the 4MB page size flag
436 * The 4MB page version of the initial
437 * kernel page mapping.
441 #if !defined(DISABLE_PSE)
442 if (cpu_feature & CPUID_PSE) {
445 * Note that we have enabled PSE mode
448 ptditmp = *((unsigned *)PTmap + i386_btop(KERNBASE));
449 ptditmp &= ~(NBPDR - 1);
450 ptditmp |= PG_V | PG_RW | PG_PS | PG_U | pgeflag;
456 * We need to finish setting up the globaldata page for the BSP.
457 * locore has already populated the page table for the mdglobaldata
460 pg = MDGLOBALDATA_BASEALLOC_PAGES;
461 gd = &CPU_prvspace[0].mdglobaldata;
462 gd->gd_CMAP1 = &SMPpt[pg + 0];
463 gd->gd_CMAP2 = &SMPpt[pg + 1];
464 gd->gd_CMAP3 = &SMPpt[pg + 2];
465 gd->gd_PMAP1 = &SMPpt[pg + 3];
466 gd->gd_GDMAP1 = &PTD[APTDPTDI];
467 gd->gd_CADDR1 = CPU_prvspace[0].CPAGE1;
468 gd->gd_CADDR2 = CPU_prvspace[0].CPAGE2;
469 gd->gd_CADDR3 = CPU_prvspace[0].CPAGE3;
470 gd->gd_PADDR1 = (unsigned *)CPU_prvspace[0].PPAGE1;
471 gd->gd_GDADDR1= (unsigned *)VADDR(APTDPTDI, 0);
477 * Set 4mb pdir for mp startup
482 if (pseflag && (cpu_feature & CPUID_PSE)) {
483 load_cr4(rcr4() | CR4_PSE);
484 if (pdir4mb && mycpu->gd_cpuid == 0) { /* only on BSP */
485 kernel_pmap.pm_pdir[KPTDI] =
486 PTD[KPTDI] = (pd_entry_t)pdir4mb;
493 * Initialize the pmap module, called by vm_init()
495 * Called from the low level boot code only.
504 * object for kernel page table pages
506 kptobj = vm_object_allocate(OBJT_DEFAULT, NKPDE);
509 * Allocate memory for random pmap data structures. Includes the
513 for(i = 0; i < vm_page_array_size; i++) {
516 m = &vm_page_array[i];
517 TAILQ_INIT(&m->md.pv_list);
518 m->md.pv_list_count = 0;
522 * init the pv free list
524 initial_pvs = vm_page_array_size;
525 if (initial_pvs < MINPV)
527 pvzone = &pvzone_store;
528 pvinit = (void *)kmem_alloc(&kernel_map,
529 initial_pvs * sizeof (struct pv_entry));
530 zbootinit(pvzone, "PV ENTRY", sizeof (struct pv_entry),
531 pvinit, initial_pvs);
534 * Now it is safe to enable pv_table recording.
536 pmap_initialized = TRUE;
540 * Initialize the address space (zone) for the pv_entries. Set a
541 * high water mark so that the system can recover from excessive
542 * numbers of pv entries.
544 * Called from the low level boot code only.
549 int shpgperproc = PMAP_SHPGPERPROC;
552 TUNABLE_INT_FETCH("vm.pmap.shpgperproc", &shpgperproc);
553 pv_entry_max = shpgperproc * maxproc + vm_page_array_size;
557 * Horrible hack for systems with a lot of memory running i386.
558 * the calculated pv_entry_max can wind up eating a ton of KVM
559 * so put a cap on the number of entries if the user did not
560 * change any of the values. This saves about 44MB of KVM on
561 * boxes with 3+GB of ram.
563 * On the flip side, this makes it more likely that some setups
564 * will run out of pv entries. Those sysads will have to bump
565 * the limit up with vm.pamp.pv_entries or vm.pmap.shpgperproc.
567 if (shpgperproc == PMAP_SHPGPERPROC) {
568 if (pv_entry_max > PMAP_PVLIMIT)
569 pv_entry_max = PMAP_PVLIMIT;
572 TUNABLE_INT_FETCH("vm.pmap.pv_entries", &pv_entry_max);
573 pv_entry_high_water = 9 * (pv_entry_max / 10);
576 * Subtract out pages already installed in the zone (hack)
578 entry_max = pv_entry_max - vm_page_array_size;
582 zinitna(pvzone, &pvzone_obj, NULL, 0, entry_max, ZONE_INTERRUPT, 1);
586 * Typically used to initialize a fictitious page by vm/device_pager.c
589 pmap_page_init(struct vm_page *m)
592 TAILQ_INIT(&m->md.pv_list);
595 /***************************************************
596 * Low level helper routines.....
597 ***************************************************/
602 test_m_maps_pv(vm_page_t m, pv_entry_t pv)
607 KKASSERT(pv->pv_m == m);
608 TAILQ_FOREACH(spv, &m->md.pv_list, pv_list) {
615 panic("test_m_maps_pv: failed m %p pv %p", m, pv);
619 ptbase_assert(struct pmap *pmap)
621 unsigned frame = (unsigned) pmap->pm_pdir[PTDPTDI] & PG_FRAME;
623 /* are we current address space or kernel? */
624 if (pmap == &kernel_pmap || frame == (((unsigned)PTDpde) & PG_FRAME))
626 KKASSERT(frame == (*mdcpu->gd_GDMAP1 & PG_FRAME));
631 #define test_m_maps_pv(m, pv)
632 #define ptbase_assert(pmap)
636 #if defined(PMAP_DIAGNOSTIC)
639 * This code checks for non-writeable/modified pages.
640 * This should be an invalid condition.
643 pmap_nw_modified(pt_entry_t ptea)
649 if ((pte & (PG_M|PG_RW)) == PG_M)
658 * This routine defines the region(s) of memory that should not be tested
659 * for the modified bit.
663 static PMAP_INLINE int
664 pmap_track_modified(vm_offset_t va)
666 if ((va < clean_sva) || (va >= clean_eva))
673 * Retrieve the mapped page table base for a particular pmap. Use our self
674 * mapping for the kernel_pmap or our current pmap.
676 * For foreign pmaps we use the per-cpu page table map. Since this involves
677 * installing a ptd it's actually (per-process x per-cpu). However, we
678 * still cannot depend on our mapping to survive thread switches because
679 * the process might be threaded and switching to another thread for the
680 * same process on the same cpu will allow that other thread to make its
683 * This could be a bit confusing but the jist is for something like the
684 * vkernel which uses foreign pmaps all the time this represents a pretty
685 * good cache that avoids unnecessary invltlb()s.
687 * The caller must hold vm_token and the returned value is only valid
688 * until the caller blocks or releases the token.
691 get_ptbase(pmap_t pmap)
693 unsigned frame = (unsigned) pmap->pm_pdir[PTDPTDI] & PG_FRAME;
694 struct mdglobaldata *gd = mdcpu;
696 ASSERT_LWKT_TOKEN_HELD(&vm_token);
699 * We can use PTmap if the pmap is our current address space or
700 * the kernel address space.
702 if (pmap == &kernel_pmap || frame == (((unsigned) PTDpde) & PG_FRAME)) {
703 return (unsigned *) PTmap;
707 * Otherwise we use the per-cpu alternative page table map. Each
708 * cpu gets its own map. Because of this we cannot use this map
709 * from interrupts or threads which can preempt.
711 * Even if we already have the map cached we may still have to
712 * invalidate the TLB if another cpu modified a PDE in the map.
714 KKASSERT(gd->mi.gd_intr_nesting_level == 0 &&
715 (gd->mi.gd_curthread->td_flags & TDF_INTTHREAD) == 0);
717 if ((*gd->gd_GDMAP1 & PG_FRAME) != frame) {
718 *gd->gd_GDMAP1 = frame | PG_RW | PG_V;
719 pmap->pm_cached |= gd->mi.gd_cpumask;
721 } else if ((pmap->pm_cached & gd->mi.gd_cpumask) == 0) {
722 pmap->pm_cached |= gd->mi.gd_cpumask;
724 } else if (dreadful_invltlb) {
727 return ((unsigned *)gd->gd_GDADDR1);
733 * Extract the physical page address associated with the map/VA pair.
735 * The caller may hold vm_token if it desires non-blocking operation.
738 pmap_extract(pmap_t pmap, vm_offset_t va)
741 vm_offset_t pdirindex;
743 lwkt_gettoken(&vm_token);
744 pdirindex = va >> PDRSHIFT;
745 if (pmap && (rtval = (unsigned) pmap->pm_pdir[pdirindex])) {
747 if ((rtval & PG_PS) != 0) {
748 rtval &= ~(NBPDR - 1);
749 rtval |= va & (NBPDR - 1);
751 pte = get_ptbase(pmap) + i386_btop(va);
752 rtval = ((*pte & PG_FRAME) | (va & PAGE_MASK));
757 lwkt_reltoken(&vm_token);
761 /***************************************************
762 * Low level mapping routines.....
763 ***************************************************/
766 * Map a wired VM page to a KVA, fully SMP synchronized.
768 * No requirements, non blocking.
771 pmap_kenter(vm_offset_t va, vm_paddr_t pa)
775 pmap_inval_info info;
777 pmap_inval_init(&info);
778 npte = pa | PG_RW | PG_V | pgeflag;
779 pte = (unsigned *)vtopte(va);
780 pmap_inval_interlock(&info, &kernel_pmap, va);
782 pmap_inval_deinterlock(&info, &kernel_pmap);
783 pmap_inval_done(&info);
787 * Map a wired VM page to a KVA, synchronized on current cpu only.
789 * No requirements, non blocking.
792 pmap_kenter_quick(vm_offset_t va, vm_paddr_t pa)
797 npte = pa | PG_RW | PG_V | pgeflag;
798 pte = (unsigned *)vtopte(va);
800 cpu_invlpg((void *)va);
804 * Synchronize a previously entered VA on all cpus.
806 * No requirements, non blocking.
809 pmap_kenter_sync(vm_offset_t va)
811 pmap_inval_info info;
813 pmap_inval_init(&info);
814 pmap_inval_interlock(&info, &kernel_pmap, va);
815 pmap_inval_deinterlock(&info, &kernel_pmap);
816 pmap_inval_done(&info);
820 * Synchronize a previously entered VA on the current cpu only.
822 * No requirements, non blocking.
825 pmap_kenter_sync_quick(vm_offset_t va)
827 cpu_invlpg((void *)va);
831 * Remove a page from the kernel pagetables, fully SMP synchronized.
833 * No requirements, non blocking.
836 pmap_kremove(vm_offset_t va)
839 pmap_inval_info info;
841 pmap_inval_init(&info);
842 pte = (unsigned *)vtopte(va);
843 pmap_inval_interlock(&info, &kernel_pmap, va);
845 pmap_inval_deinterlock(&info, &kernel_pmap);
846 pmap_inval_done(&info);
850 * Remove a page from the kernel pagetables, synchronized on current cpu only.
852 * No requirements, non blocking.
855 pmap_kremove_quick(vm_offset_t va)
858 pte = (unsigned *)vtopte(va);
860 cpu_invlpg((void *)va);
864 * Adjust the permissions of a page in the kernel page table,
865 * synchronized on the current cpu only.
867 * No requirements, non blocking.
870 pmap_kmodify_rw(vm_offset_t va)
872 atomic_set_int(vtopte(va), PG_RW);
873 cpu_invlpg((void *)va);
877 * Adjust the permissions of a page in the kernel page table,
878 * synchronized on the current cpu only.
880 * No requirements, non blocking.
883 pmap_kmodify_nc(vm_offset_t va)
885 atomic_set_int(vtopte(va), PG_N);
886 cpu_invlpg((void *)va);
890 * Map a range of physical addresses into kernel virtual address space.
892 * No requirements, non blocking.
895 pmap_map(vm_offset_t *virtp, vm_paddr_t start, vm_paddr_t end, int prot)
897 vm_offset_t sva, virt;
900 while (start < end) {
901 pmap_kenter(virt, start);
910 * Add a list of wired pages to the kva, fully SMP synchronized.
912 * No requirements, non blocking.
915 pmap_qenter(vm_offset_t va, vm_page_t *m, int count)
919 end_va = va + count * PAGE_SIZE;
921 while (va < end_va) {
924 pte = (unsigned *)vtopte(va);
925 *pte = VM_PAGE_TO_PHYS(*m) | PG_RW | PG_V | pgeflag;
926 cpu_invlpg((void *)va);
930 smp_invltlb(); /* XXX */
934 * Remove pages from KVA, fully SMP synchronized.
936 * No requirements, non blocking.
939 pmap_qremove(vm_offset_t va, int count)
943 end_va = va + count*PAGE_SIZE;
945 while (va < end_va) {
948 pte = (unsigned *)vtopte(va);
950 cpu_invlpg((void *)va);
957 * This routine works like vm_page_lookup() but also blocks as long as the
958 * page is busy. This routine does not busy the page it returns.
960 * The caller must hold the object.
963 pmap_page_lookup(vm_object_t object, vm_pindex_t pindex)
967 ASSERT_LWKT_TOKEN_HELD(vm_object_token(object));
968 m = vm_page_lookup_busy_wait(object, pindex, FALSE, "pplookp");
974 * Create a new thread and optionally associate it with a (new) process.
975 * NOTE! the new thread's cpu may not equal the current cpu.
978 pmap_init_thread(thread_t td)
980 /* enforce pcb placement */
981 td->td_pcb = (struct pcb *)(td->td_kstack + td->td_kstack_size) - 1;
982 td->td_savefpu = &td->td_pcb->pcb_save;
983 td->td_sp = (char *)td->td_pcb - 16;
987 * This routine directly affects the fork perf for a process.
990 pmap_init_proc(struct proc *p)
994 /***************************************************
995 * Page table page management routines.....
996 ***************************************************/
999 * This routine unwires page table pages, removing and freeing the page
1000 * tale page when the wire count drops to 0.
1002 * The caller must hold vm_token.
1003 * This function can block.
1006 _pmap_unwire_pte(pmap_t pmap, vm_page_t m, pmap_inval_info_t info)
1009 * Wait until we can busy the page ourselves. We cannot have
1010 * any active flushes if we block.
1012 vm_page_busy_wait(m, FALSE, "pmuwpt");
1013 KASSERT(m->queue == PQ_NONE,
1014 ("_pmap_unwire_pte: %p->queue != PQ_NONE", m));
1016 if (m->wire_count == 1) {
1018 * Unmap the page table page.
1020 * NOTE: We must clear pm_cached for all cpus, including
1021 * the current one, when clearing a page directory
1024 pmap_inval_interlock(info, pmap, -1);
1025 KKASSERT(pmap->pm_pdir[m->pindex]);
1026 pmap->pm_pdir[m->pindex] = 0;
1027 pmap->pm_cached = 0;
1028 pmap_inval_deinterlock(info, pmap);
1030 KKASSERT(pmap->pm_stats.resident_count > 0);
1031 --pmap->pm_stats.resident_count;
1033 if (pmap->pm_ptphint == m)
1034 pmap->pm_ptphint = NULL;
1037 * This was our last hold, the page had better be unwired
1038 * after we decrement wire_count.
1040 * FUTURE NOTE: shared page directory page could result in
1041 * multiple wire counts.
1043 vm_page_unwire(m, 0);
1044 vm_page_flag_clear(m, PG_MAPPED | PG_WRITEABLE);
1046 vm_page_free_zero(m);
1049 KKASSERT(m->wire_count > 1);
1050 if (vm_page_unwire_quick(m))
1051 panic("pmap_unwire_pte: Insufficient wire_count");
1058 * The caller must hold vm_token.
1060 * This function can block.
1062 * This function can race the wire_count 2->1 case because the page
1063 * is not busied during the unwire_quick operation. An eventual
1064 * pmap_release() will catch the case.
1066 static PMAP_INLINE int
1067 pmap_unwire_pte(pmap_t pmap, vm_page_t m, pmap_inval_info_t info)
1069 KKASSERT(m->wire_count > 0);
1070 if (m->wire_count > 1) {
1071 if (vm_page_unwire_quick(m))
1072 panic("pmap_unwire_pte: Insufficient wire_count");
1075 return _pmap_unwire_pte(pmap, m, info);
1080 * After removing a (user) page table entry, this routine is used to
1081 * conditionally free the page, and manage the hold/wire counts.
1083 * The caller must hold vm_token.
1084 * This function can block regardless.
1087 pmap_unuse_pt(pmap_t pmap, vm_offset_t va, vm_page_t mpte,
1088 pmap_inval_info_t info)
1092 ASSERT_LWKT_TOKEN_HELD(vm_object_token(pmap->pm_pteobj));
1094 if (va >= UPT_MIN_ADDRESS)
1098 ptepindex = (va >> PDRSHIFT);
1099 if ((mpte = pmap->pm_ptphint) != NULL &&
1100 mpte->pindex == ptepindex &&
1101 (mpte->flags & PG_BUSY) == 0) {
1104 mpte = pmap_page_lookup(pmap->pm_pteobj, ptepindex);
1105 pmap->pm_ptphint = mpte;
1106 vm_page_wakeup(mpte);
1109 pmap_unwire_pte(pmap, mpte, info);
1113 * Initialize pmap0/vmspace0. This pmap is not added to pmap_list because
1114 * it, and IdlePTD, represents the template used to update all other pmaps.
1116 * On architectures where the kernel pmap is not integrated into the user
1117 * process pmap, this pmap represents the process pmap, not the kernel pmap.
1118 * kernel_pmap should be used to directly access the kernel_pmap.
1123 pmap_pinit0(struct pmap *pmap)
1126 (pd_entry_t *)kmem_alloc_pageable(&kernel_map, PAGE_SIZE);
1127 pmap_kenter((vm_offset_t)pmap->pm_pdir, (vm_offset_t) IdlePTD);
1129 pmap->pm_active = 0;
1130 pmap->pm_cached = 0;
1131 pmap->pm_ptphint = NULL;
1132 TAILQ_INIT(&pmap->pm_pvlist);
1133 TAILQ_INIT(&pmap->pm_pvlist_free);
1134 spin_init(&pmap->pm_spin);
1135 lwkt_token_init(&pmap->pm_token, "pmap_tok");
1136 bzero(&pmap->pm_stats, sizeof pmap->pm_stats);
1140 * Initialize a preallocated and zeroed pmap structure,
1141 * such as one in a vmspace structure.
1146 pmap_pinit(struct pmap *pmap)
1151 * No need to allocate page table space yet but we do need a valid
1152 * page directory table.
1154 if (pmap->pm_pdir == NULL) {
1156 (pd_entry_t *)kmem_alloc_pageable(&kernel_map, PAGE_SIZE);
1160 * Allocate an object for the ptes
1162 if (pmap->pm_pteobj == NULL)
1163 pmap->pm_pteobj = vm_object_allocate(OBJT_DEFAULT, PTDPTDI + 1);
1166 * Allocate the page directory page, unless we already have
1167 * one cached. If we used the cached page the wire_count will
1168 * already be set appropriately.
1170 if ((ptdpg = pmap->pm_pdirm) == NULL) {
1171 ptdpg = vm_page_grab(pmap->pm_pteobj, PTDPTDI,
1172 VM_ALLOC_NORMAL | VM_ALLOC_RETRY |
1174 pmap->pm_pdirm = ptdpg;
1175 vm_page_flag_clear(ptdpg, PG_MAPPED);
1176 vm_page_wire(ptdpg);
1177 KKASSERT(ptdpg->valid == VM_PAGE_BITS_ALL);
1178 pmap_kenter((vm_offset_t)pmap->pm_pdir, VM_PAGE_TO_PHYS(ptdpg));
1179 vm_page_wakeup(ptdpg);
1181 pmap->pm_pdir[MPPTDI] = PTD[MPPTDI];
1183 /* install self-referential address mapping entry */
1184 *(unsigned *) (pmap->pm_pdir + PTDPTDI) =
1185 VM_PAGE_TO_PHYS(ptdpg) | PG_V | PG_RW | PG_A | PG_M;
1188 pmap->pm_active = 0;
1189 pmap->pm_cached = 0;
1190 pmap->pm_ptphint = NULL;
1191 TAILQ_INIT(&pmap->pm_pvlist);
1192 TAILQ_INIT(&pmap->pm_pvlist_free);
1193 spin_init(&pmap->pm_spin);
1194 lwkt_token_init(&pmap->pm_token, "pmap_tok");
1195 bzero(&pmap->pm_stats, sizeof pmap->pm_stats);
1196 pmap->pm_stats.resident_count = 1;
1200 * Clean up a pmap structure so it can be physically freed. This routine
1201 * is called by the vmspace dtor function. A great deal of pmap data is
1202 * left passively mapped to improve vmspace management so we have a bit
1203 * of cleanup work to do here.
1208 pmap_puninit(pmap_t pmap)
1212 pmap_wait(pmap, -1);
1213 KKASSERT(pmap->pm_active == 0);
1214 if ((p = pmap->pm_pdirm) != NULL) {
1215 KKASSERT(pmap->pm_pdir != NULL);
1216 pmap_kremove((vm_offset_t)pmap->pm_pdir);
1217 vm_page_busy_wait(p, FALSE, "pgpun");
1218 vm_page_unwire(p, 0);
1219 vm_page_free_zero(p);
1220 pmap->pm_pdirm = NULL;
1222 if (pmap->pm_pdir) {
1223 kmem_free(&kernel_map, (vm_offset_t)pmap->pm_pdir, PAGE_SIZE);
1224 pmap->pm_pdir = NULL;
1226 if (pmap->pm_pteobj) {
1227 vm_object_deallocate(pmap->pm_pteobj);
1228 pmap->pm_pteobj = NULL;
1233 * Wire in kernel global address entries. To avoid a race condition
1234 * between pmap initialization and pmap_growkernel, this procedure
1235 * adds the pmap to the master list (which growkernel scans to update),
1236 * then copies the template.
1241 pmap_pinit2(struct pmap *pmap)
1244 * XXX copies current process, does not fill in MPPTDI
1246 spin_lock(&pmap_spin);
1247 TAILQ_INSERT_TAIL(&pmap_list, pmap, pm_pmnode);
1248 bcopy(PTD + KPTDI, pmap->pm_pdir + KPTDI, nkpt * PTESIZE);
1249 spin_unlock(&pmap_spin);
1253 * Attempt to release and free a vm_page in a pmap. Returns 1 on success,
1254 * 0 on failure (if the procedure had to sleep).
1256 * When asked to remove the page directory page itself, we actually just
1257 * leave it cached so we do not have to incur the SMP inval overhead of
1258 * removing the kernel mapping. pmap_puninit() will take care of it.
1260 * The caller must hold vm_token.
1261 * This function can block regardless.
1264 pmap_release_free_page(struct pmap *pmap, vm_page_t p)
1266 unsigned *pde = (unsigned *) pmap->pm_pdir;
1269 * This code optimizes the case of freeing non-busy
1270 * page-table pages. Those pages are zero now, and
1271 * might as well be placed directly into the zero queue.
1273 if (vm_page_busy_try(p, FALSE)) {
1274 vm_page_sleep_busy(p, FALSE, "pmaprl");
1278 KKASSERT(pmap->pm_stats.resident_count > 0);
1279 KKASSERT(pde[p->pindex]);
1282 * page table page's wire_count must be 1. Caller is the pmap
1283 * termination code which holds the pm_pteobj, there is a race
1284 * if someone else is trying to hold the VM object in order to
1285 * clean up a wire_count.
1287 if (p->wire_count != 1) {
1288 if (pmap->pm_pteobj->hold_count <= 1)
1289 panic("pmap_release: freeing wired page table page");
1290 kprintf("pmap_release_free_page: unwire race detected\n");
1292 tsleep(p, 0, "pmapx", 1);
1297 * Remove the page table page from the processes address space.
1299 pmap->pm_cached = 0;
1301 --pmap->pm_stats.resident_count;
1302 if (pmap->pm_ptphint && (pmap->pm_ptphint->pindex == p->pindex))
1303 pmap->pm_ptphint = NULL;
1306 * We leave the page directory page cached, wired, and mapped in
1307 * the pmap until the dtor function (pmap_puninit()) gets called.
1308 * However, still clean it up so we can set PG_ZERO.
1310 * The pmap has already been removed from the pmap_list in the
1313 if (p->pindex == PTDPTDI) {
1314 bzero(pde + KPTDI, nkpt * PTESIZE);
1315 bzero(pde + MPPTDI, (NPDEPG - MPPTDI) * PTESIZE);
1316 vm_page_flag_set(p, PG_ZERO);
1320 * This case can occur if a pmap_unwire_pte() loses a race
1321 * while the page is unbusied.
1323 /*panic("pmap_release: page should already be gone %p", p);*/
1324 vm_page_flag_clear(p, PG_MAPPED);
1325 vm_page_unwire(p, 0);
1326 vm_page_free_zero(p);
1332 * This routine is called if the page table page is not mapped correctly.
1334 * The caller must hold vm_token.
1337 _pmap_allocpte(pmap_t pmap, unsigned ptepindex)
1343 * Find or fabricate a new pagetable page. Setting VM_ALLOC_ZERO
1344 * will zero any new page and mark it valid.
1346 m = vm_page_grab(pmap->pm_pteobj, ptepindex,
1347 VM_ALLOC_NORMAL | VM_ALLOC_ZERO | VM_ALLOC_RETRY);
1349 KASSERT(m->queue == PQ_NONE,
1350 ("_pmap_allocpte: %p->queue != PQ_NONE", m));
1353 * Increment the wire count for the page we will be returning to
1359 * It is possible that someone else got in and mapped by the page
1360 * directory page while we were blocked, if so just unbusy and
1361 * return the wired page.
1363 if ((ptepa = pmap->pm_pdir[ptepindex]) != 0) {
1364 KKASSERT((ptepa & PG_FRAME) == VM_PAGE_TO_PHYS(m));
1370 * Map the pagetable page into the process address space, if
1371 * it isn't already there.
1373 * NOTE: For safety clear pm_cached for all cpus including the
1374 * current one when adding a PDE to the map.
1376 ++pmap->pm_stats.resident_count;
1378 ptepa = VM_PAGE_TO_PHYS(m);
1379 pmap->pm_pdir[ptepindex] =
1380 (pd_entry_t) (ptepa | PG_U | PG_RW | PG_V | PG_A | PG_M);
1381 pmap->pm_cached = 0;
1384 * Set the page table hint
1386 pmap->pm_ptphint = m;
1387 vm_page_flag_set(m, PG_MAPPED);
1394 * Allocate a page table entry for a va.
1396 * The caller must hold vm_token.
1399 pmap_allocpte(pmap_t pmap, vm_offset_t va)
1405 ASSERT_LWKT_TOKEN_HELD(vm_object_token(pmap->pm_pteobj));
1408 * Calculate pagetable page index
1410 ptepindex = va >> PDRSHIFT;
1413 * Get the page directory entry
1415 ptepa = (vm_offset_t) pmap->pm_pdir[ptepindex];
1418 * This supports switching from a 4MB page to a
1421 if (ptepa & PG_PS) {
1422 pmap->pm_pdir[ptepindex] = 0;
1429 * If the page table page is mapped, we just increment the
1430 * wire count, and activate it.
1434 * In order to get the page table page, try the
1437 if ((mpte = pmap->pm_ptphint) != NULL &&
1438 (mpte->pindex == ptepindex) &&
1439 (mpte->flags & PG_BUSY) == 0) {
1440 vm_page_wire_quick(mpte);
1442 mpte = pmap_page_lookup(pmap->pm_pteobj, ptepindex);
1443 pmap->pm_ptphint = mpte;
1444 vm_page_wire_quick(mpte);
1445 vm_page_wakeup(mpte);
1450 * Here if the pte page isn't mapped, or if it has been deallocated.
1452 return _pmap_allocpte(pmap, ptepindex);
1456 /***************************************************
1457 * Pmap allocation/deallocation routines.
1458 ***************************************************/
1461 * Release any resources held by the given physical map.
1462 * Called when a pmap initialized by pmap_pinit is being released.
1463 * Should only be called if the map contains no valid mappings.
1465 * Caller must hold pmap->pm_token
1467 static int pmap_release_callback(struct vm_page *p, void *data);
1470 pmap_release(struct pmap *pmap)
1472 vm_object_t object = pmap->pm_pteobj;
1473 struct rb_vm_page_scan_info info;
1475 KASSERT(pmap->pm_active == 0,
1476 ("pmap still active! %08x", pmap->pm_active));
1477 #if defined(DIAGNOSTIC)
1478 if (object->ref_count != 1)
1479 panic("pmap_release: pteobj reference count != 1");
1483 info.object = object;
1485 spin_lock(&pmap_spin);
1486 TAILQ_REMOVE(&pmap_list, pmap, pm_pmnode);
1487 spin_unlock(&pmap_spin);
1489 vm_object_hold(object);
1490 /*lwkt_gettoken(&vm_token);*/
1494 info.limit = object->generation;
1496 vm_page_rb_tree_RB_SCAN(&object->rb_memq, NULL,
1497 pmap_release_callback, &info);
1498 if (info.error == 0 && info.mpte) {
1499 if (!pmap_release_free_page(pmap, info.mpte))
1502 } while (info.error);
1503 /*lwkt_reltoken(&vm_token);*/
1504 vm_object_drop(object);
1506 pmap->pm_cached = 0;
1510 * The caller must hold vm_token.
1513 pmap_release_callback(struct vm_page *p, void *data)
1515 struct rb_vm_page_scan_info *info = data;
1517 if (p->pindex == PTDPTDI) {
1521 if (!pmap_release_free_page(info->pmap, p)) {
1525 if (info->object->generation != info->limit) {
1533 * Grow the number of kernel page table entries, if needed.
1538 pmap_growkernel(vm_offset_t kstart, vm_offset_t kend)
1540 vm_offset_t addr = kend;
1542 vm_offset_t ptppaddr;
1546 vm_object_hold(kptobj);
1547 if (kernel_vm_end == 0) {
1548 kernel_vm_end = KERNBASE;
1550 while (pdir_pde(PTD, kernel_vm_end)) {
1551 kernel_vm_end = (kernel_vm_end + PAGE_SIZE * NPTEPG) &
1552 ~(PAGE_SIZE * NPTEPG - 1);
1556 addr = (addr + PAGE_SIZE * NPTEPG) & ~(PAGE_SIZE * NPTEPG - 1);
1557 while (kernel_vm_end < addr) {
1558 if (pdir_pde(PTD, kernel_vm_end)) {
1559 kernel_vm_end = (kernel_vm_end + PAGE_SIZE * NPTEPG) &
1560 ~(PAGE_SIZE * NPTEPG - 1);
1565 * This index is bogus, but out of the way
1567 nkpg = vm_page_alloc(kptobj, nkpt, VM_ALLOC_NORMAL |
1569 VM_ALLOC_INTERRUPT);
1571 panic("pmap_growkernel: no memory to grow kernel");
1574 ptppaddr = VM_PAGE_TO_PHYS(nkpg);
1575 pmap_zero_page(ptppaddr);
1576 newpdir = (pd_entry_t) (ptppaddr | PG_V | PG_RW | PG_A | PG_M);
1577 pdir_pde(PTD, kernel_vm_end) = newpdir;
1578 *pmap_pde(&kernel_pmap, kernel_vm_end) = newpdir;
1582 * This update must be interlocked with pmap_pinit2.
1584 spin_lock(&pmap_spin);
1585 TAILQ_FOREACH(pmap, &pmap_list, pm_pmnode) {
1586 *pmap_pde(pmap, kernel_vm_end) = newpdir;
1588 spin_unlock(&pmap_spin);
1589 kernel_vm_end = (kernel_vm_end + PAGE_SIZE * NPTEPG) &
1590 ~(PAGE_SIZE * NPTEPG - 1);
1592 vm_object_drop(kptobj);
1596 * Add a reference to the specified pmap.
1601 pmap_reference(pmap_t pmap)
1604 lwkt_gettoken(&vm_token);
1606 lwkt_reltoken(&vm_token);
1611 * vm_token must be held
1615 pmap_hold(pmap_t pmap)
1621 * vm_token must be held
1625 pmap_drop(pmap_t pmap)
1628 if (pmap->pm_count == (int)0x80000000)
1634 pmap_wait(pmap_t pmap, int count)
1636 lwkt_gettoken(&vm_token);
1637 pmap->pm_count += count;
1638 if (pmap->pm_count & 0x7FFFFFFF) {
1639 while (pmap->pm_count & 0x7FFFFFFF) {
1640 pmap->pm_count |= 0x80000000;
1641 tsleep(pmap, 0, "pmapd", 0);
1642 pmap->pm_count &= ~0x80000000;
1643 kprintf("pmap_wait: race averted\n");
1646 lwkt_reltoken(&vm_token);
1649 /***************************************************
1650 * page management routines.
1651 ***************************************************/
1654 * free the pv_entry back to the free list. This function may be
1655 * called from an interrupt.
1657 * The caller must hold vm_token.
1659 static PMAP_INLINE void
1660 free_pv_entry(pv_entry_t pv)
1662 struct mdglobaldata *gd;
1664 KKASSERT(pv->pv_m != NULL);
1668 if (gd->gd_freepv == NULL)
1675 * get a new pv_entry, allocating a block from the system
1676 * when needed. This function may be called from an interrupt thread.
1678 * THIS FUNCTION CAN BLOCK ON THE ZALLOC TOKEN, serialization of other
1679 * tokens (aka vm_token) to be temporarily lost.
1681 * The caller must hold vm_token.
1686 struct mdglobaldata *gd;
1690 if (pv_entry_high_water &&
1691 (pv_entry_count > pv_entry_high_water) &&
1692 (pmap_pagedaemon_waken == 0)) {
1693 pmap_pagedaemon_waken = 1;
1694 wakeup (&vm_pages_needed);
1697 if ((pv = gd->gd_freepv) != NULL)
1698 gd->gd_freepv = NULL;
1700 pv = zalloc(pvzone);
1705 * This routine is very drastic, but can save the system
1715 static int warningdone=0;
1717 if (pmap_pagedaemon_waken == 0)
1719 lwkt_gettoken(&vm_token);
1720 pmap_pagedaemon_waken = 0;
1722 if (warningdone < 5) {
1723 kprintf("pmap_collect: collecting pv entries -- "
1724 "suggest increasing PMAP_SHPGPERPROC\n");
1728 for (i = 0; i < vm_page_array_size; i++) {
1729 m = &vm_page_array[i];
1730 if (m->wire_count || m->hold_count)
1732 if (vm_page_busy_try(m, TRUE) == 0) {
1733 if (m->wire_count == 0 && m->hold_count == 0) {
1739 lwkt_reltoken(&vm_token);
1744 * Remove the pv entry and unwire the page table page related to the
1745 * pte the caller has cleared from the page table.
1747 * The caller must hold vm_token.
1750 pmap_remove_entry(struct pmap *pmap, vm_page_t m,
1751 vm_offset_t va, pmap_inval_info_t info)
1758 * XXX very poor performance for PG_FICTITIOUS pages (m will be NULL).
1760 ASSERT_LWKT_TOKEN_HELD(&vm_token);
1761 if (m && m->md.pv_list_count < pmap->pm_stats.resident_count) {
1762 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) {
1763 if (pmap == pv->pv_pmap && va == pv->pv_va)
1767 TAILQ_FOREACH(pv, &pmap->pm_pvlist, pv_plist) {
1768 KKASSERT(pv->pv_pmap == pmap);
1769 if (va == pv->pv_va) {
1770 if (m == NULL) /* PG_FICTITIOUS case */
1781 test_m_maps_pv(m, pv);
1782 TAILQ_REMOVE(&m->md.pv_list, pv, pv_list);
1783 m->md.pv_list_count--;
1785 atomic_add_int(&m->object->agg_pv_list_count, -1);
1786 if (TAILQ_EMPTY(&m->md.pv_list))
1787 vm_page_flag_clear(m, PG_MAPPED | PG_WRITEABLE);
1788 TAILQ_REMOVE(&pmap->pm_pvlist, pv, pv_plist);
1789 ++pmap->pm_generation;
1794 vm_object_hold(pmap->pm_pteobj);
1795 pmap_unuse_pt(pmap, va, pv->pv_ptem, info);
1796 vm_object_drop(pmap->pm_pteobj);
1801 * Create a pv entry for page at pa for (pmap, va).
1803 * The caller must hold vm_token.
1806 pmap_insert_entry(pmap_t pmap, pv_entry_t pv, vm_offset_t va,
1807 vm_page_t mpte, vm_page_t m)
1809 KKASSERT(pv->pv_m == NULL);
1815 TAILQ_INSERT_TAIL(&pmap->pm_pvlist, pv, pv_plist);
1816 TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list);
1817 ++pmap->pm_generation;
1818 m->md.pv_list_count++;
1820 atomic_add_int(&m->object->agg_pv_list_count, 1);
1824 * pmap_remove_pte: do the things to unmap a page in a process.
1826 * The caller must hold vm_token.
1828 * WARNING! As with most other pmap functions this one can block, so
1829 * callers using temporary page table mappings must reload
1833 pmap_remove_pte(struct pmap *pmap, unsigned *ptq, vm_offset_t va,
1834 pmap_inval_info_t info)
1839 ptbase_assert(pmap);
1840 pmap_inval_interlock(info, pmap, va);
1841 ptbase_assert(pmap);
1842 oldpte = loadandclear(ptq);
1844 pmap->pm_stats.wired_count -= 1;
1845 pmap_inval_deinterlock(info, pmap);
1846 KKASSERT(oldpte & PG_V);
1848 * Machines that don't support invlpg, also don't support
1849 * PG_G. XXX PG_G is disabled for SMP so don't worry about
1853 cpu_invlpg((void *)va);
1854 KKASSERT(pmap->pm_stats.resident_count > 0);
1855 --pmap->pm_stats.resident_count;
1856 if (oldpte & PG_MANAGED) {
1857 if (oldpte & PG_DEVICE)
1860 m = PHYS_TO_VM_PAGE(oldpte);
1861 if (oldpte & PG_M) {
1862 #if defined(PMAP_DIAGNOSTIC)
1863 if (pmap_nw_modified((pt_entry_t) oldpte)) {
1864 kprintf("pmap_remove: modified page not "
1865 "writable: va: %p, pte: 0x%lx\n",
1866 (void *)va, (long)oldpte);
1869 if (m && pmap_track_modified(va))
1872 if (m && (oldpte & PG_A))
1873 vm_page_flag_set(m, PG_REFERENCED);
1874 pmap_remove_entry(pmap, m, va, info);
1876 pmap_unuse_pt(pmap, va, NULL, info);
1881 * Remove a single page from a process address space.
1883 * The caller must hold vm_token.
1886 pmap_remove_page(struct pmap *pmap, vm_offset_t va, pmap_inval_info_t info)
1891 * If there is no pte for this address, just skip it!!! Otherwise
1892 * get a local va for mappings for this pmap and remove the entry.
1894 if (*pmap_pde(pmap, va) != 0) {
1895 ptq = get_ptbase(pmap) + i386_btop(va);
1897 pmap_remove_pte(pmap, ptq, va, info);
1904 * Remove the given range of addresses from the specified map.
1906 * It is assumed that the start and end are properly rounded to the page
1912 pmap_remove(struct pmap *pmap, vm_offset_t sva, vm_offset_t eva)
1916 vm_offset_t ptpaddr;
1917 vm_offset_t sindex, eindex;
1918 struct pmap_inval_info info;
1923 vm_object_hold(pmap->pm_pteobj);
1924 lwkt_gettoken(&vm_token);
1925 if (pmap->pm_stats.resident_count == 0) {
1926 lwkt_reltoken(&vm_token);
1927 vm_object_drop(pmap->pm_pteobj);
1931 pmap_inval_init(&info);
1934 * special handling of removing one page. a very
1935 * common operation and easy to short circuit some
1938 if (((sva + PAGE_SIZE) == eva) &&
1939 (((unsigned) pmap->pm_pdir[(sva >> PDRSHIFT)] & PG_PS) == 0)) {
1940 pmap_remove_page(pmap, sva, &info);
1941 pmap_inval_done(&info);
1942 lwkt_reltoken(&vm_token);
1943 vm_object_drop(pmap->pm_pteobj);
1948 * Get a local virtual address for the mappings that are being
1951 sindex = i386_btop(sva);
1952 eindex = i386_btop(eva);
1954 while (sindex < eindex) {
1958 * Stop scanning if no pages are left
1960 if (pmap->pm_stats.resident_count == 0)
1964 * Calculate index for next page table, limited by eindex.
1966 pdnxt = ((sindex + NPTEPG) & ~(NPTEPG - 1));
1970 pdirindex = sindex / NPDEPG;
1971 ptpaddr = (unsigned)pmap->pm_pdir[pdirindex];
1972 if (ptpaddr & PG_PS) {
1973 pmap_inval_interlock(&info, pmap, -1);
1974 pmap->pm_pdir[pdirindex] = 0;
1975 pmap->pm_stats.resident_count -= NBPDR / PAGE_SIZE;
1976 pmap->pm_cached = 0;
1977 pmap_inval_deinterlock(&info, pmap);
1983 * Weed out invalid mappings. Note: we assume that the page
1984 * directory table is always allocated, and in kernel virtual.
1992 * Sub-scan the page table page. pmap_remove_pte() can
1993 * block on us, invalidating ptbase, so we must reload
1994 * ptbase and we must also check whether the page directory
1995 * page is still present.
1997 while (sindex < pdnxt) {
2000 ptbase = get_ptbase(pmap);
2001 if (ptbase[sindex]) {
2002 va = i386_ptob(sindex);
2003 pmap_remove_pte(pmap, ptbase + sindex,
2006 if (pmap->pm_pdir[pdirindex] == 0 ||
2007 (pmap->pm_pdir[pdirindex] & PG_PS)) {
2013 pmap_inval_done(&info);
2014 lwkt_reltoken(&vm_token);
2015 vm_object_drop(pmap->pm_pteobj);
2019 * Removes this physical page from all physical maps in which it resides.
2020 * Reflects back modify bits to the pager.
2022 * vm_token must be held by caller.
2025 pmap_remove_all(vm_page_t m)
2027 struct pmap_inval_info info;
2028 unsigned *pte, tpte;
2032 if (!pmap_initialized /* || (m->flags & PG_FICTITIOUS)*/)
2034 if (TAILQ_EMPTY(&m->md.pv_list))
2037 pmap_inval_init(&info);
2038 while ((pv = TAILQ_FIRST(&m->md.pv_list)) != NULL) {
2040 KKASSERT(pmap->pm_stats.resident_count > 0);
2042 vm_object_hold(pmap->pm_pteobj);
2044 if (pv != TAILQ_FIRST(&m->md.pv_list)) {
2045 vm_object_drop(pmap->pm_pteobj);
2050 --pmap->pm_stats.resident_count;
2051 pte = pmap_pte_quick(pmap, pv->pv_va);
2052 pmap_inval_interlock(&info, pmap, pv->pv_va);
2053 tpte = loadandclear(pte);
2055 pmap->pm_stats.wired_count--;
2056 pmap_inval_deinterlock(&info, pmap);
2058 vm_page_flag_set(m, PG_REFERENCED);
2059 KKASSERT((tpte & PG_DEVICE) || PHYS_TO_VM_PAGE(tpte) == m);
2062 * Update the vm_page_t clean and reference bits.
2065 #if defined(PMAP_DIAGNOSTIC)
2066 if (pmap_nw_modified((pt_entry_t) tpte)) {
2067 kprintf("pmap_remove_all: modified page "
2068 "not writable: va: %p, pte: 0x%lx\n",
2069 (void *)pv->pv_va, (long)tpte);
2072 if (pmap_track_modified(pv->pv_va))
2075 KKASSERT(pv->pv_m == m);
2076 KKASSERT(pv == TAILQ_FIRST(&m->md.pv_list));
2077 TAILQ_REMOVE(&m->md.pv_list, pv, pv_list);
2078 TAILQ_REMOVE(&pmap->pm_pvlist, pv, pv_plist);
2079 ++pmap->pm_generation;
2080 m->md.pv_list_count--;
2082 atomic_add_int(&m->object->agg_pv_list_count, -1);
2083 if (TAILQ_EMPTY(&m->md.pv_list))
2084 vm_page_flag_clear(m, PG_MAPPED | PG_WRITEABLE);
2085 pmap_unuse_pt(pmap, pv->pv_va, pv->pv_ptem, &info);
2086 vm_object_drop(pmap->pm_pteobj);
2090 KKASSERT((m->flags & (PG_MAPPED|PG_WRITEABLE)) == 0);
2091 pmap_inval_done(&info);
2095 * Set the physical protection on the specified range of this map
2101 pmap_protect(pmap_t pmap, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot)
2104 vm_offset_t pdnxt, ptpaddr;
2105 vm_pindex_t sindex, eindex;
2106 pmap_inval_info info;
2111 if ((prot & VM_PROT_READ) == VM_PROT_NONE) {
2112 pmap_remove(pmap, sva, eva);
2116 if (prot & VM_PROT_WRITE)
2119 lwkt_gettoken(&vm_token);
2120 pmap_inval_init(&info);
2122 ptbase = get_ptbase(pmap);
2124 sindex = i386_btop(sva);
2125 eindex = i386_btop(eva);
2127 for (; sindex < eindex; sindex = pdnxt) {
2130 pdnxt = ((sindex + NPTEPG) & ~(NPTEPG - 1));
2132 pdirindex = sindex / NPDEPG;
2133 if (((ptpaddr = (unsigned) pmap->pm_pdir[pdirindex]) & PG_PS) != 0) {
2134 pmap_inval_interlock(&info, pmap, -1);
2135 pmap->pm_pdir[pdirindex] &= ~(PG_M|PG_RW);
2136 pmap->pm_stats.resident_count -= NBPDR / PAGE_SIZE;
2137 pmap_inval_deinterlock(&info, pmap);
2142 * Weed out invalid mappings. Note: we assume that the page
2143 * directory table is always allocated, and in kernel virtual.
2148 if (pdnxt > eindex) {
2152 for (; sindex != pdnxt; sindex++) {
2160 pmap_inval_interlock(&info, pmap, i386_ptob(sindex));
2162 pbits = ptbase[sindex];
2165 if (pbits & PG_MANAGED) {
2168 if ((pbits & PG_DEVICE) == 0) {
2169 m = PHYS_TO_VM_PAGE(pbits);
2176 if (pmap_track_modified(i386_ptob(sindex))) {
2177 if ((pbits & PG_DEVICE) == 0) {
2179 m = PHYS_TO_VM_PAGE(pbits);
2187 if (pbits != cbits &&
2188 !atomic_cmpset_int(ptbase + sindex, pbits, cbits)) {
2191 pmap_inval_deinterlock(&info, pmap);
2194 pmap_inval_done(&info);
2195 lwkt_reltoken(&vm_token);
2199 * Insert the given physical page (p) at the specified virtual address (v)
2200 * in the target physical map with the protection requested.
2202 * If specified, the page will be wired down, meaning that the related pte
2203 * cannot be reclaimed.
2208 pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot,
2209 boolean_t wired, vm_map_entry_t entry __unused)
2214 vm_offset_t origpte, newpte;
2216 pmap_inval_info info;
2223 #ifdef PMAP_DIAGNOSTIC
2225 panic("pmap_enter: toobig");
2226 if ((va >= UPT_MIN_ADDRESS) && (va < UPT_MAX_ADDRESS)) {
2227 panic("pmap_enter: invalid to pmap_enter page "
2228 "table pages (va: %p)", (void *)va);
2231 if (va < UPT_MAX_ADDRESS && pmap == &kernel_pmap) {
2232 kprintf("Warning: pmap_enter called on UVA with kernel_pmap\n");
2233 print_backtrace(-1);
2235 if (va >= UPT_MAX_ADDRESS && pmap != &kernel_pmap) {
2236 kprintf("Warning: pmap_enter called on KVA without kernel_pmap\n");
2237 print_backtrace(-1);
2240 vm_object_hold(pmap->pm_pteobj);
2241 lwkt_gettoken(&vm_token);
2244 * This can block, get it before we do anything important.
2246 if (pmap_initialized &&
2247 (m->flags & (/*PG_FICTITIOUS|*/PG_UNMANAGED)) == 0) {
2248 pv = get_pv_entry();
2254 * In the case that a page table page is not
2255 * resident, we are creating it here.
2257 if (va < UPT_MIN_ADDRESS)
2258 mpte = pmap_allocpte(pmap, va);
2262 if ((prot & VM_PROT_NOSYNC) == 0)
2263 pmap_inval_init(&info);
2264 pte = pmap_pte(pmap, va);
2267 * Page Directory table entry not valid, we need a new PT page
2270 panic("pmap_enter: invalid page directory pdir=0x%lx, va=%p",
2271 (long)pmap->pm_pdir[PTDPTDI], (void *)va);
2274 pa = VM_PAGE_TO_PHYS(m) & PG_FRAME;
2275 origpte = *(vm_offset_t *)pte;
2276 opa = origpte & PG_FRAME;
2278 if (origpte & PG_PS)
2279 panic("pmap_enter: attempted pmap_enter on 4MB page");
2282 * Mapping has not changed, must be protection or wiring change.
2284 if (origpte && (opa == pa)) {
2286 * Wiring change, just update stats. We don't worry about
2287 * wiring PT pages as they remain resident as long as there
2288 * are valid mappings in them. Hence, if a user page is wired,
2289 * the PT page will be also.
2291 if (wired && ((origpte & PG_W) == 0))
2292 pmap->pm_stats.wired_count++;
2293 else if (!wired && (origpte & PG_W))
2294 pmap->pm_stats.wired_count--;
2296 #if defined(PMAP_DIAGNOSTIC)
2297 if (pmap_nw_modified((pt_entry_t) origpte)) {
2298 kprintf("pmap_enter: modified page not "
2299 "writable: va: %p, pte: 0x%lx\n",
2300 (void *)va, (long )origpte);
2305 * We might be turning off write access to the page,
2306 * so we go ahead and sense modify status.
2308 if (origpte & PG_MANAGED) {
2309 if ((origpte & PG_M) &&
2310 (origpte & PG_DEVICE) == 0 &&
2311 pmap_track_modified(va)) {
2313 om = PHYS_TO_VM_PAGE(opa);
2317 KKASSERT(m->flags & PG_MAPPED);
2322 * Mapping has changed, invalidate old range and fall through to
2323 * handle validating new mapping.
2325 * Since we have a ref on the page directory page pmap_pte()
2326 * will always return non-NULL.
2328 * NOTE: pmap_remove_pte() can block and cause the temporary ptbase
2329 * to get wiped. reload the ptbase. I'm not sure if it is
2330 * also possible to race another pmap_enter() but check for
2334 KKASSERT((origpte & PG_FRAME) ==
2335 (*(vm_offset_t *)pte & PG_FRAME));
2336 if (prot & VM_PROT_NOSYNC) {
2337 prot &= ~VM_PROT_NOSYNC;
2338 pmap_inval_init(&info);
2340 pmap_remove_pte(pmap, pte, va, &info);
2341 pte = pmap_pte(pmap, va);
2342 origpte = *(vm_offset_t *)pte;
2343 opa = origpte & PG_FRAME;
2345 kprintf("pmap_enter: Warning, raced pmap %p va %p\n",
2351 * Enter on the PV list if part of our managed memory. Note that we
2352 * raise IPL while manipulating pv_table since pmap_enter can be
2353 * called at interrupt time.
2355 if (pmap_initialized &&
2356 (m->flags & (/*PG_FICTITIOUS|*/PG_UNMANAGED)) == 0) {
2357 pmap_insert_entry(pmap, pv, va, mpte, m);
2359 ptbase_assert(pmap);
2361 vm_page_flag_set(m, PG_MAPPED);
2365 * Increment counters
2367 ++pmap->pm_stats.resident_count;
2369 pmap->pm_stats.wired_count++;
2370 KKASSERT(*pte == 0);
2374 * Now validate mapping with desired protection/wiring.
2376 ptbase_assert(pmap);
2377 newpte = (vm_offset_t) (pa | pte_prot(pmap, prot) | PG_V);
2381 if (va < UPT_MIN_ADDRESS)
2383 if (pmap == &kernel_pmap)
2385 if (m->flags & PG_FICTITIOUS)
2386 newpte |= PG_DEVICE;
2389 * If the mapping or permission bits are different, we need
2390 * to update the pte. If the pte is already present we have
2391 * to get rid of the extra wire-count on mpte we had obtained
2394 * mpte has a new wire_count, which also serves to prevent the
2395 * page table page from getting ripped out while we work. If we
2396 * are modifying an existing pte instead of installing a new one
2397 * we have to drop it.
2399 if ((origpte & ~(PG_M|PG_A)) != newpte) {
2400 if (prot & VM_PROT_NOSYNC)
2401 cpu_invlpg((void *)va);
2403 pmap_inval_interlock(&info, pmap, va);
2404 ptbase_assert(pmap);
2407 KKASSERT((*pte & PG_FRAME) == (newpte & PG_FRAME));
2408 if (mpte && vm_page_unwire_quick(mpte))
2409 panic("pmap_enter: Insufficient wire_count");
2412 *pte = newpte | PG_A;
2413 if ((prot & VM_PROT_NOSYNC) == 0)
2414 pmap_inval_deinterlock(&info, pmap);
2416 vm_page_flag_set(m, PG_WRITEABLE);
2419 KKASSERT((*pte & PG_FRAME) == (newpte & PG_FRAME));
2420 if (mpte && vm_page_unwire_quick(mpte))
2421 panic("pmap_enter: Insufficient wire_count");
2426 * NOTE: mpte invalid after this point if we block.
2428 KKASSERT((newpte & PG_MANAGED) == 0 || (m->flags & PG_MAPPED));
2429 if ((prot & VM_PROT_NOSYNC) == 0)
2430 pmap_inval_done(&info);
2433 lwkt_reltoken(&vm_token);
2434 vm_object_drop(pmap->pm_pteobj);
2438 * This code works like pmap_enter() but assumes VM_PROT_READ and not-wired.
2439 * This code also assumes that the pmap has no pre-existing entry for this
2442 * This code currently may only be used on user pmaps, not kernel_pmap.
2447 pmap_enter_quick(pmap_t pmap, vm_offset_t va, vm_page_t m)
2454 pmap_inval_info info;
2458 vm_object_hold(pmap->pm_pteobj);
2459 lwkt_gettoken(&vm_token);
2462 * This can block, get it before we do anything important.
2464 if (pmap_initialized &&
2465 (m->flags & (/*PG_FICTITIOUS|*/PG_UNMANAGED)) == 0) {
2466 pv = get_pv_entry();
2471 pmap_inval_init(&info);
2473 if (va < UPT_MAX_ADDRESS && pmap == &kernel_pmap) {
2474 kprintf("Warning: pmap_enter_quick called on UVA with kernel_pmap\n");
2475 print_backtrace(-1);
2477 if (va >= UPT_MAX_ADDRESS && pmap != &kernel_pmap) {
2478 kprintf("Warning: pmap_enter_quick called on KVA without kernel_pmap\n");
2479 print_backtrace(-1);
2482 KKASSERT(va < UPT_MIN_ADDRESS); /* assert used on user pmaps only */
2485 * Calculate the page table page (mpte), allocating it if necessary.
2487 * A held page table page (mpte), or NULL, is passed onto the
2488 * section following.
2490 if (va < UPT_MIN_ADDRESS) {
2492 * Calculate pagetable page index
2494 ptepindex = va >> PDRSHIFT;
2498 * Get the page directory entry
2500 ptepa = (vm_offset_t) pmap->pm_pdir[ptepindex];
2503 * If the page table page is mapped, we just increment
2504 * the wire count, and activate it.
2508 panic("pmap_enter_quick: unexpected mapping into 4MB page");
2509 if ((mpte = pmap->pm_ptphint) != NULL &&
2510 (mpte->pindex == ptepindex) &&
2511 (mpte->flags & PG_BUSY) == 0) {
2512 vm_page_wire_quick(mpte);
2514 mpte = pmap_page_lookup(pmap->pm_pteobj,
2516 pmap->pm_ptphint = mpte;
2517 vm_page_wire_quick(mpte);
2518 vm_page_wakeup(mpte);
2521 mpte = _pmap_allocpte(pmap, ptepindex);
2523 } while (mpte == NULL);
2526 /* this code path is not yet used */
2530 * With a valid (and held) page directory page, we can just use
2531 * vtopte() to get to the pte. If the pte is already present
2532 * we do not disturb it.
2534 pte = (unsigned *)vtopte(va);
2536 KKASSERT(*pte & PG_V);
2537 pa = VM_PAGE_TO_PHYS(m);
2538 KKASSERT(((*pte ^ pa) & PG_FRAME) == 0);
2539 pmap_inval_done(&info);
2541 pmap_unwire_pte(pmap, mpte, &info);
2546 lwkt_reltoken(&vm_token);
2547 vm_object_drop(pmap->pm_pteobj);
2552 * Enter on the PV list if part of our managed memory
2554 if (pmap_initialized &&
2555 (m->flags & (/*PG_FICTITIOUS|*/PG_UNMANAGED)) == 0) {
2556 pmap_insert_entry(pmap, pv, va, mpte, m);
2558 vm_page_flag_set(m, PG_MAPPED);
2562 * Increment counters
2564 ++pmap->pm_stats.resident_count;
2566 pa = VM_PAGE_TO_PHYS(m);
2569 * Now validate mapping with RO protection
2571 newpte = pa | PG_V | PG_U;
2572 if (m->flags & PG_FICTITIOUS)
2573 newpte |= PG_DEVICE;
2574 if ((m->flags & PG_UNMANAGED) == 0)
2575 newpte |= PG_MANAGED;
2577 /* pmap_inval_add(&info, pmap, va); shouldn't be needed inval->valid */
2578 pmap_inval_done(&info);
2583 lwkt_reltoken(&vm_token);
2584 vm_object_drop(pmap->pm_pteobj);
2588 * Make a temporary mapping for a physical address. This is only intended
2589 * to be used for panic dumps.
2591 * The caller is responsible for calling smp_invltlb().
2596 pmap_kenter_temporary(vm_paddr_t pa, long i)
2598 pmap_kenter_quick((vm_offset_t)crashdumpmap + (i * PAGE_SIZE), pa);
2599 return ((void *)crashdumpmap);
2602 #define MAX_INIT_PT (96)
2605 * This routine preloads the ptes for a given object into the specified pmap.
2606 * This eliminates the blast of soft faults on process startup and
2607 * immediately after an mmap.
2611 static int pmap_object_init_pt_callback(vm_page_t p, void *data);
2614 pmap_object_init_pt(pmap_t pmap, vm_offset_t addr, vm_prot_t prot,
2615 vm_object_t object, vm_pindex_t pindex,
2616 vm_size_t size, int limit)
2618 struct rb_vm_page_scan_info info;
2623 * We can't preinit if read access isn't set or there is no pmap
2626 if ((prot & VM_PROT_READ) == 0 || pmap == NULL || object == NULL)
2630 * We can't preinit if the pmap is not the current pmap
2632 lp = curthread->td_lwp;
2633 if (lp == NULL || pmap != vmspace_pmap(lp->lwp_vmspace))
2636 psize = i386_btop(size);
2638 if ((object->type != OBJT_VNODE) ||
2639 ((limit & MAP_PREFAULT_PARTIAL) && (psize > MAX_INIT_PT) &&
2640 (object->resident_page_count > MAX_INIT_PT))) {
2644 if (psize + pindex > object->size) {
2645 if (object->size < pindex)
2647 psize = object->size - pindex;
2654 * Use a red-black scan to traverse the requested range and load
2655 * any valid pages found into the pmap.
2657 * We cannot safely scan the object's memq unless we are in a
2658 * critical section since interrupts can remove pages from objects.
2660 info.start_pindex = pindex;
2661 info.end_pindex = pindex + psize - 1;
2667 vm_object_hold_shared(object);
2668 vm_page_rb_tree_RB_SCAN(&object->rb_memq, rb_vm_page_scancmp,
2669 pmap_object_init_pt_callback, &info);
2670 vm_object_drop(object);
2674 * The caller must hold vm_token.
2678 pmap_object_init_pt_callback(vm_page_t p, void *data)
2680 struct rb_vm_page_scan_info *info = data;
2681 vm_pindex_t rel_index;
2683 * don't allow an madvise to blow away our really
2684 * free pages allocating pv entries.
2686 if ((info->limit & MAP_PREFAULT_MADVISE) &&
2687 vmstats.v_free_count < vmstats.v_free_reserved) {
2692 * Ignore list markers and ignore pages we cannot instantly
2693 * busy (while holding the object token).
2695 if (p->flags & PG_MARKER)
2697 if (vm_page_busy_try(p, TRUE))
2699 if (((p->valid & VM_PAGE_BITS_ALL) == VM_PAGE_BITS_ALL) &&
2700 (p->flags & PG_FICTITIOUS) == 0) {
2701 if ((p->queue - p->pc) == PQ_CACHE)
2702 vm_page_deactivate(p);
2703 rel_index = p->pindex - info->start_pindex;
2704 pmap_enter_quick(info->pmap,
2705 info->addr + i386_ptob(rel_index), p);
2712 * Return TRUE if the pmap is in shape to trivially
2713 * pre-fault the specified address.
2715 * Returns FALSE if it would be non-trivial or if a
2716 * pte is already loaded into the slot.
2721 pmap_prefault_ok(pmap_t pmap, vm_offset_t addr)
2726 lwkt_gettoken(&vm_token);
2727 if ((*pmap_pde(pmap, addr)) == 0) {
2730 pte = (unsigned *) vtopte(addr);
2731 ret = (*pte) ? 0 : 1;
2733 lwkt_reltoken(&vm_token);
2738 * Change the wiring attribute for a map/virtual-adderss pair. The mapping
2739 * must already exist.
2744 pmap_change_wiring(pmap_t pmap, vm_offset_t va, boolean_t wired,
2745 vm_map_entry_t entry __unused)
2752 lwkt_gettoken(&vm_token);
2753 pte = pmap_pte(pmap, va);
2755 if (wired && !pmap_pte_w(pte))
2756 pmap->pm_stats.wired_count++;
2757 else if (!wired && pmap_pte_w(pte))
2758 pmap->pm_stats.wired_count--;
2761 * Wiring is not a hardware characteristic so there is no need to
2762 * invalidate TLB. However, in an SMP environment we must use
2763 * a locked bus cycle to update the pte (if we are not using
2764 * the pmap_inval_*() API that is)... it's ok to do this for simple
2768 atomic_set_int(pte, PG_W);
2770 atomic_clear_int(pte, PG_W);
2771 lwkt_reltoken(&vm_token);
2775 * Copy the range specified by src_addr/len from the source map to the
2776 * range dst_addr/len in the destination map.
2778 * This routine is only advisory and need not do anything.
2783 pmap_copy(pmap_t dst_pmap, pmap_t src_pmap, vm_offset_t dst_addr,
2784 vm_size_t len, vm_offset_t src_addr)
2790 * Zero the specified PA by mapping the page into KVM and clearing its
2796 pmap_zero_page(vm_paddr_t phys)
2798 struct mdglobaldata *gd = mdcpu;
2801 if (*(int *)gd->gd_CMAP3)
2802 panic("pmap_zero_page: CMAP3 busy");
2803 *(int *)gd->gd_CMAP3 =
2804 PG_V | PG_RW | (phys & PG_FRAME) | PG_A | PG_M;
2805 cpu_invlpg(gd->gd_CADDR3);
2806 bzero(gd->gd_CADDR3, PAGE_SIZE);
2807 *(int *) gd->gd_CMAP3 = 0;
2812 * Assert that a page is empty, panic if it isn't.
2817 pmap_page_assertzero(vm_paddr_t phys)
2819 struct mdglobaldata *gd = mdcpu;
2823 if (*(int *)gd->gd_CMAP3)
2824 panic("pmap_zero_page: CMAP3 busy");
2825 *(int *)gd->gd_CMAP3 =
2826 PG_V | PG_RW | (phys & PG_FRAME) | PG_A | PG_M;
2827 cpu_invlpg(gd->gd_CADDR3);
2828 for (i = 0; i < PAGE_SIZE; i += 4) {
2829 if (*(int *)((char *)gd->gd_CADDR3 + i) != 0) {
2830 panic("pmap_page_assertzero() @ %p not zero!",
2831 (void *)gd->gd_CADDR3);
2834 *(int *) gd->gd_CMAP3 = 0;
2839 * Zero part of a physical page by mapping it into memory and clearing
2840 * its contents with bzero.
2842 * off and size may not cover an area beyond a single hardware page.
2847 pmap_zero_page_area(vm_paddr_t phys, int off, int size)
2849 struct mdglobaldata *gd = mdcpu;
2852 if (*(int *) gd->gd_CMAP3)
2853 panic("pmap_zero_page: CMAP3 busy");
2854 *(int *) gd->gd_CMAP3 = PG_V | PG_RW | (phys & PG_FRAME) | PG_A | PG_M;
2855 cpu_invlpg(gd->gd_CADDR3);
2856 bzero((char *)gd->gd_CADDR3 + off, size);
2857 *(int *) gd->gd_CMAP3 = 0;
2862 * Copy the physical page from the source PA to the target PA.
2863 * This function may be called from an interrupt. No locking
2869 pmap_copy_page(vm_paddr_t src, vm_paddr_t dst)
2871 struct mdglobaldata *gd = mdcpu;
2874 if (*(int *) gd->gd_CMAP1)
2875 panic("pmap_copy_page: CMAP1 busy");
2876 if (*(int *) gd->gd_CMAP2)
2877 panic("pmap_copy_page: CMAP2 busy");
2879 *(int *) gd->gd_CMAP1 = PG_V | (src & PG_FRAME) | PG_A;
2880 *(int *) gd->gd_CMAP2 = PG_V | PG_RW | (dst & PG_FRAME) | PG_A | PG_M;
2882 cpu_invlpg(gd->gd_CADDR1);
2883 cpu_invlpg(gd->gd_CADDR2);
2885 bcopy(gd->gd_CADDR1, gd->gd_CADDR2, PAGE_SIZE);
2887 *(int *) gd->gd_CMAP1 = 0;
2888 *(int *) gd->gd_CMAP2 = 0;
2893 * Copy the physical page from the source PA to the target PA.
2894 * This function may be called from an interrupt. No locking
2900 pmap_copy_page_frag(vm_paddr_t src, vm_paddr_t dst, size_t bytes)
2902 struct mdglobaldata *gd = mdcpu;
2905 if (*(int *) gd->gd_CMAP1)
2906 panic("pmap_copy_page: CMAP1 busy");
2907 if (*(int *) gd->gd_CMAP2)
2908 panic("pmap_copy_page: CMAP2 busy");
2910 *(int *) gd->gd_CMAP1 = PG_V | (src & PG_FRAME) | PG_A;
2911 *(int *) gd->gd_CMAP2 = PG_V | PG_RW | (dst & PG_FRAME) | PG_A | PG_M;
2913 cpu_invlpg(gd->gd_CADDR1);
2914 cpu_invlpg(gd->gd_CADDR2);
2916 bcopy((char *)gd->gd_CADDR1 + (src & PAGE_MASK),
2917 (char *)gd->gd_CADDR2 + (dst & PAGE_MASK),
2920 *(int *) gd->gd_CMAP1 = 0;
2921 *(int *) gd->gd_CMAP2 = 0;
2926 * Returns true if the pmap's pv is one of the first
2927 * 16 pvs linked to from this page. This count may
2928 * be changed upwards or downwards in the future; it
2929 * is only necessary that true be returned for a small
2930 * subset of pmaps for proper page aging.
2935 pmap_page_exists_quick(pmap_t pmap, vm_page_t m)
2940 if (!pmap_initialized || (m->flags & PG_FICTITIOUS))
2943 lwkt_gettoken(&vm_token);
2944 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) {
2945 if (pv->pv_pmap == pmap) {
2946 lwkt_reltoken(&vm_token);
2953 lwkt_reltoken(&vm_token);
2958 * Remove all pages from specified address space
2959 * this aids process exit speeds. Also, this code
2960 * is special cased for current process only, but
2961 * can have the more generic (and slightly slower)
2962 * mode enabled. This is much faster than pmap_remove
2963 * in the case of running down an entire address space.
2968 pmap_remove_pages(pmap_t pmap, vm_offset_t sva, vm_offset_t eva)
2971 unsigned *pte, tpte;
2974 pmap_inval_info info;
2976 int32_t save_generation;
2978 lp = curthread->td_lwp;
2979 if (lp && pmap == vmspace_pmap(lp->lwp_vmspace))
2984 if (pmap->pm_pteobj)
2985 vm_object_hold(pmap->pm_pteobj);
2986 lwkt_gettoken(&vm_token);
2987 pmap_inval_init(&info);
2989 for (pv = TAILQ_FIRST(&pmap->pm_pvlist); pv; pv = npv) {
2990 if (pv->pv_va >= eva || pv->pv_va < sva) {
2991 npv = TAILQ_NEXT(pv, pv_plist);
2995 KKASSERT(pmap == pv->pv_pmap);
2998 pte = (unsigned *)vtopte(pv->pv_va);
3000 pte = pmap_pte_quick(pmap, pv->pv_va);
3002 pmap_inval_interlock(&info, pmap, pv->pv_va);
3005 * We cannot remove wired pages from a process' mapping
3009 pmap_inval_deinterlock(&info, pmap);
3010 npv = TAILQ_NEXT(pv, pv_plist);
3014 tpte = loadandclear(pte);
3015 pmap_inval_deinterlock(&info, pmap);
3017 if (tpte & PG_DEVICE)
3020 m = PHYS_TO_VM_PAGE(tpte);
3021 test_m_maps_pv(m, pv);
3023 KASSERT(m < &vm_page_array[vm_page_array_size],
3024 ("pmap_remove_pages: bad tpte %x", tpte));
3026 KKASSERT(pmap->pm_stats.resident_count > 0);
3027 --pmap->pm_stats.resident_count;
3030 * Update the vm_page_t clean and reference bits.
3036 npv = TAILQ_NEXT(pv, pv_plist);
3037 KKASSERT(pv->pv_m == m);
3038 KKASSERT(pv->pv_pmap == pmap);
3039 TAILQ_REMOVE(&pmap->pm_pvlist, pv, pv_plist);
3040 save_generation = ++pmap->pm_generation;
3042 m->md.pv_list_count--;
3044 atomic_add_int(&m->object->agg_pv_list_count, -1);
3045 TAILQ_REMOVE(&m->md.pv_list, pv, pv_list);
3046 if (TAILQ_EMPTY(&m->md.pv_list))
3047 vm_page_flag_clear(m, PG_MAPPED | PG_WRITEABLE);
3049 pmap_unuse_pt(pmap, pv->pv_va, pv->pv_ptem, &info);
3053 * Restart the scan if we blocked during the unuse or free
3054 * calls and other removals were made.
3056 if (save_generation != pmap->pm_generation) {
3057 kprintf("Warning: pmap_remove_pages race-A avoided\n");
3058 npv = TAILQ_FIRST(&pmap->pm_pvlist);
3061 pmap_inval_done(&info);
3062 lwkt_reltoken(&vm_token);
3063 if (pmap->pm_pteobj)
3064 vm_object_drop(pmap->pm_pteobj);
3068 * pmap_testbit tests bits in pte's
3069 * note that the testbit/clearbit routines are inline,
3070 * and a lot of things compile-time evaluate.
3072 * The caller must hold vm_token.
3075 pmap_testbit(vm_page_t m, int bit)
3080 if (!pmap_initialized || (m->flags & PG_FICTITIOUS))
3083 if (TAILQ_FIRST(&m->md.pv_list) == NULL)
3086 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) {
3088 * if the bit being tested is the modified bit, then
3089 * mark clean_map and ptes as never
3092 if (bit & (PG_A|PG_M)) {
3093 if (!pmap_track_modified(pv->pv_va))
3097 #if defined(PMAP_DIAGNOSTIC)
3099 kprintf("Null pmap (tb) at va: %p\n",
3104 pte = pmap_pte_quick(pv->pv_pmap, pv->pv_va);
3113 * This routine is used to modify bits in ptes
3115 * The caller must hold vm_token.
3117 static __inline void
3118 pmap_clearbit(vm_page_t m, int bit)
3120 struct pmap_inval_info info;
3125 if (!pmap_initialized || (m->flags & PG_FICTITIOUS))
3128 pmap_inval_init(&info);
3131 * Loop over all current mappings setting/clearing as appropos If
3132 * setting RO do we need to clear the VAC?
3134 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) {
3136 * don't write protect pager mappings
3139 if (!pmap_track_modified(pv->pv_va))
3143 #if defined(PMAP_DIAGNOSTIC)
3145 kprintf("Null pmap (cb) at va: %p\n",
3152 * Careful here. We can use a locked bus instruction to
3153 * clear PG_A or PG_M safely but we need to synchronize
3154 * with the target cpus when we mess with PG_RW.
3156 * We do not have to force synchronization when clearing
3157 * PG_M even for PTEs generated via virtual memory maps,
3158 * because the virtual kernel will invalidate the pmap
3159 * entry when/if it needs to resynchronize the Modify bit.
3162 pmap_inval_interlock(&info, pv->pv_pmap, pv->pv_va);
3163 pte = pmap_pte_quick(pv->pv_pmap, pv->pv_va);
3170 atomic_clear_int(pte, PG_M|PG_RW);
3173 * The cpu may be trying to set PG_M
3174 * simultaniously with our clearing
3177 if (!atomic_cmpset_int(pte, pbits,
3181 } else if (bit == PG_M) {
3183 * We could also clear PG_RW here to force
3184 * a fault on write to redetect PG_M for
3185 * virtual kernels, but it isn't necessary
3186 * since virtual kernels invalidate the pte
3187 * when they clear the VPTE_M bit in their
3188 * virtual page tables.
3190 atomic_clear_int(pte, PG_M);
3192 atomic_clear_int(pte, bit);
3196 pmap_inval_deinterlock(&info, pv->pv_pmap);
3198 pmap_inval_done(&info);
3202 * Lower the permission for all mappings to a given page.
3207 pmap_page_protect(vm_page_t m, vm_prot_t prot)
3209 if ((prot & VM_PROT_WRITE) == 0) {
3210 lwkt_gettoken(&vm_token);
3211 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) {
3212 pmap_clearbit(m, PG_RW);
3213 vm_page_flag_clear(m, PG_WRITEABLE);
3217 lwkt_reltoken(&vm_token);
3222 * Return the physical address given a physical page index.
3227 pmap_phys_address(vm_pindex_t ppn)
3229 return (i386_ptob(ppn));
3233 * Return a count of reference bits for a page, clearing those bits.
3234 * It is not necessary for every reference bit to be cleared, but it
3235 * is necessary that 0 only be returned when there are truly no
3236 * reference bits set.
3241 pmap_ts_referenced(vm_page_t m)
3243 pv_entry_t pv, pvf, pvn;
3247 if (!pmap_initialized || (m->flags & PG_FICTITIOUS))
3250 lwkt_gettoken(&vm_token);
3252 if ((pv = TAILQ_FIRST(&m->md.pv_list)) != NULL) {
3257 pvn = TAILQ_NEXT(pv, pv_list);
3259 TAILQ_REMOVE(&m->md.pv_list, pv, pv_list);
3260 TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list);
3262 if (!pmap_track_modified(pv->pv_va))
3265 pte = pmap_pte_quick(pv->pv_pmap, pv->pv_va);
3267 if (pte && (*pte & PG_A)) {
3268 atomic_clear_int(pte, PG_A);
3274 } while ((pv = pvn) != NULL && pv != pvf);
3277 lwkt_reltoken(&vm_token);
3283 * Return whether or not the specified physical page was modified
3284 * in any physical maps.
3289 pmap_is_modified(vm_page_t m)
3293 lwkt_gettoken(&vm_token);
3294 res = pmap_testbit(m, PG_M);
3295 lwkt_reltoken(&vm_token);
3300 * Clear the modify bits on the specified physical page.
3305 pmap_clear_modify(vm_page_t m)
3307 lwkt_gettoken(&vm_token);
3308 pmap_clearbit(m, PG_M);
3309 lwkt_reltoken(&vm_token);
3313 * Clear the reference bit on the specified physical page.
3318 pmap_clear_reference(vm_page_t m)
3320 lwkt_gettoken(&vm_token);
3321 pmap_clearbit(m, PG_A);
3322 lwkt_reltoken(&vm_token);
3326 * Miscellaneous support routines follow
3328 * Called from the low level boot code only.
3331 i386_protection_init(void)
3335 kp = protection_codes;
3336 for (prot = 0; prot < 8; prot++) {
3338 case VM_PROT_NONE | VM_PROT_NONE | VM_PROT_NONE:
3340 * Read access is also 0. There isn't any execute bit,
3341 * so just make it readable.
3343 case VM_PROT_READ | VM_PROT_NONE | VM_PROT_NONE:
3344 case VM_PROT_READ | VM_PROT_NONE | VM_PROT_EXECUTE:
3345 case VM_PROT_NONE | VM_PROT_NONE | VM_PROT_EXECUTE:
3348 case VM_PROT_NONE | VM_PROT_WRITE | VM_PROT_NONE:
3349 case VM_PROT_NONE | VM_PROT_WRITE | VM_PROT_EXECUTE:
3350 case VM_PROT_READ | VM_PROT_WRITE | VM_PROT_NONE:
3351 case VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE:
3359 * Map a set of physical memory pages into the kernel virtual
3360 * address space. Return a pointer to where it is mapped. This
3361 * routine is intended to be used for mapping device memory,
3364 * NOTE: we can't use pgeflag unless we invalidate the pages one at
3370 pmap_mapdev(vm_paddr_t pa, vm_size_t size)
3372 vm_offset_t va, tmpva, offset;
3375 offset = pa & PAGE_MASK;
3376 size = roundup(offset + size, PAGE_SIZE);
3378 va = kmem_alloc_nofault(&kernel_map, size, PAGE_SIZE);
3380 panic("pmap_mapdev: Couldn't alloc kernel virtual memory");
3383 for (tmpva = va; size > 0;) {
3384 pte = (unsigned *)vtopte(tmpva);
3385 *pte = pa | PG_RW | PG_V; /* | pgeflag; */
3393 return ((void *)(va + offset));
3397 pmap_mapdev_uncacheable(vm_paddr_t pa, vm_size_t size)
3399 vm_offset_t va, tmpva, offset;
3402 offset = pa & PAGE_MASK;
3403 size = roundup(offset + size, PAGE_SIZE);
3405 va = kmem_alloc_nofault(&kernel_map, size, PAGE_SIZE);
3407 panic("pmap_mapdev_uncacheable: "
3408 "Couldn't alloc kernel virtual memory");
3412 for (tmpva = va; size > 0;) {
3413 pte = (unsigned *)vtopte(tmpva);
3414 *pte = pa | PG_RW | PG_V | PG_N; /* | pgeflag; */
3422 return ((void *)(va + offset));
3429 pmap_unmapdev(vm_offset_t va, vm_size_t size)
3431 vm_offset_t base, offset;
3433 base = va & PG_FRAME;
3434 offset = va & PAGE_MASK;
3435 size = roundup(offset + size, PAGE_SIZE);
3436 pmap_qremove(va, size >> PAGE_SHIFT);
3437 kmem_free(&kernel_map, base, size);
3441 * Change the PAT attribute on an existing kernel memory map. Caller
3442 * must ensure that the virtual memory in question is not accessed
3443 * during the adjustment.
3446 pmap_change_attr(vm_offset_t va, vm_size_t count, int mode)
3448 /* XXX pmap_change_attr() not implemented on i386 */
3452 * Perform the pmap work for mincore
3454 * The caller must hold vm_token if the caller wishes a stable result,
3455 * and even in that case some bits can change due to third party accesses
3461 pmap_mincore(pmap_t pmap, vm_offset_t addr)
3463 unsigned *ptep, pte;
3467 lwkt_gettoken(&vm_token);
3468 ptep = pmap_pte(pmap, addr);
3470 if (ptep && (pte = *ptep) != 0) {
3473 val = MINCORE_INCORE;
3474 if ((pte & PG_MANAGED) == 0)
3477 pa = pte & PG_FRAME;
3479 if (pte & PG_DEVICE)
3482 m = PHYS_TO_VM_PAGE(pa);
3488 val |= MINCORE_MODIFIED|MINCORE_MODIFIED_OTHER;
3489 } else if (m && (m->dirty || pmap_is_modified(m))) {
3491 * Modified by someone else
3493 val |= MINCORE_MODIFIED_OTHER;
3500 val |= MINCORE_REFERENCED|MINCORE_REFERENCED_OTHER;
3501 } else if (m && ((m->flags & PG_REFERENCED) ||
3502 pmap_ts_referenced(m))) {
3504 * Referenced by someone else
3506 val |= MINCORE_REFERENCED_OTHER;
3507 vm_page_flag_set(m, PG_REFERENCED);
3511 lwkt_reltoken(&vm_token);
3516 * Replace p->p_vmspace with a new one. If adjrefs is non-zero the new
3517 * vmspace will be ref'd and the old one will be deref'd.
3519 * cr3 will be reloaded if any lwp is the current lwp.
3521 * Only called with new VM spaces.
3522 * The process must have only a single thread.
3523 * The process must hold the vmspace->vm_map.token for oldvm and newvm
3524 * No other requirements.
3527 pmap_replacevm(struct proc *p, struct vmspace *newvm, int adjrefs)
3529 struct vmspace *oldvm;
3532 oldvm = p->p_vmspace;
3533 if (oldvm != newvm) {
3535 sysref_get(&newvm->vm_sysref);
3536 p->p_vmspace = newvm;
3537 KKASSERT(p->p_nthreads == 1);
3538 lp = RB_ROOT(&p->p_lwp_tree);
3539 pmap_setlwpvm(lp, newvm);
3541 sysref_put(&oldvm->vm_sysref);
3546 * Set the vmspace for a LWP. The vmspace is almost universally set the
3547 * same as the process vmspace, but virtual kernels need to swap out contexts
3548 * on a per-lwp basis.
3550 * Always called with a lp under the caller's direct control, either
3551 * unscheduled or the current lwp.
3556 pmap_setlwpvm(struct lwp *lp, struct vmspace *newvm)
3558 struct vmspace *oldvm;
3561 oldvm = lp->lwp_vmspace;
3563 if (oldvm != newvm) {
3564 lp->lwp_vmspace = newvm;
3565 if (curthread->td_lwp == lp) {
3566 pmap = vmspace_pmap(newvm);
3567 atomic_set_cpumask(&pmap->pm_active, mycpu->gd_cpumask);
3568 if (pmap->pm_active & CPUMASK_LOCK)
3569 pmap_interlock_wait(newvm);
3570 #if defined(SWTCH_OPTIM_STATS)
3573 curthread->td_pcb->pcb_cr3 = vtophys(pmap->pm_pdir);
3574 load_cr3(curthread->td_pcb->pcb_cr3);
3575 pmap = vmspace_pmap(oldvm);
3576 atomic_clear_cpumask(&pmap->pm_active,
3583 * Called when switching to a locked pmap, used to interlock against pmaps
3584 * undergoing modifications to prevent us from activating the MMU for the
3585 * target pmap until all such modifications have completed. We have to do
3586 * this because the thread making the modifications has already set up its
3587 * SMP synchronization mask.
3592 pmap_interlock_wait(struct vmspace *vm)
3594 struct pmap *pmap = &vm->vm_pmap;
3596 if (pmap->pm_active & CPUMASK_LOCK) {
3598 DEBUG_PUSH_INFO("pmap_interlock_wait");
3599 while (pmap->pm_active & CPUMASK_LOCK) {
3601 lwkt_process_ipiq();
3609 * Return a page-directory alignment hint for device mappings which will
3610 * allow the use of super-pages for the mapping.
3615 pmap_addr_hint(vm_object_t obj, vm_offset_t addr, vm_size_t size)
3618 if ((obj == NULL) || (size < NBPDR) ||
3619 ((obj->type != OBJT_DEVICE) && (obj->type != OBJT_MGTDEVICE))) {
3623 addr = (addr + (NBPDR - 1)) & ~(NBPDR - 1);
3628 * Return whether the PGE flag is supported globally.
3633 pmap_get_pgeflag(void)
3639 * Used by kmalloc/kfree, page already exists at va
3642 pmap_kvtom(vm_offset_t va)
3644 unsigned *ptep = vtopte(va);
3646 KKASSERT((*ptep & PG_DEVICE) == 0);
3647 return(PHYS_TO_VM_PAGE(*ptep & PG_FRAME));
3651 pmap_object_init(vm_object_t object)
3657 pmap_object_free(vm_object_t object)