pmap.c revision 156930
150477Speter/*- 235388Smjacob * Copyright (c) 1991 Regents of the University of California. 335388Smjacob * All rights reserved. 435388Smjacob * Copyright (c) 1994 John S. Dyson 535388Smjacob * All rights reserved. 645040Smjacob * Copyright (c) 1994 David Greenman 735388Smjacob * All rights reserved. 835388Smjacob * Copyright (c) 2005 Alan L. Cox <alc@cs.rice.edu> 945040Smjacob * All rights reserved. 1035388Smjacob * 1135388Smjacob * This code is derived from software contributed to Berkeley by 1235388Smjacob * the Systems Programming Group of the University of Utah Computer 1335388Smjacob * Science Department and William Jolitz of UUNET Technologies Inc. 1435388Smjacob * 1535388Smjacob * Redistribution and use in source and binary forms, with or without 1635388Smjacob * modification, are permitted provided that the following conditions 1735388Smjacob * are met: 1835388Smjacob * 1. Redistributions of source code must retain the above copyright 1935388Smjacob * notice, this list of conditions and the following disclaimer. 2035388Smjacob * 2. Redistributions in binary form must reproduce the above copyright 2135388Smjacob * notice, this list of conditions and the following disclaimer in the 2235388Smjacob * documentation and/or other materials provided with the distribution. 2335388Smjacob * 3. All advertising materials mentioning features or use of this software 2435388Smjacob * must display the following acknowledgement: 2535388Smjacob * This product includes software developed by the University of 2635388Smjacob * California, Berkeley and its contributors. 2735388Smjacob * 4. Neither the name of the University nor the names of its contributors 2835388Smjacob * may be used to endorse or promote products derived from this software 2935388Smjacob * without specific prior written permission. 3035388Smjacob * 3135388Smjacob * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 3235388Smjacob * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 3335388Smjacob * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 3435388Smjacob * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 3535388Smjacob * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 3635388Smjacob * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3735388Smjacob * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3835388Smjacob * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3935388Smjacob * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 4035388Smjacob * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 4135388Smjacob * SUCH DAMAGE. 4235388Smjacob * 4335388Smjacob * from: @(#)pmap.c 7.7 (Berkeley) 5/12/91 4435388Smjacob */ 4535388Smjacob/*- 4635388Smjacob * Copyright (c) 2003 Networks Associates Technology, Inc. 4735388Smjacob * All rights reserved. 4835388Smjacob * 4935388Smjacob * This software was developed for the FreeBSD Project by Jake Burkholder, 5035388Smjacob * Safeport Network Services, and Network Associates Laboratories, the 5135388Smjacob * Security Research Division of Network Associates, Inc. under 5235388Smjacob * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA 5335388Smjacob * CHATS research program. 5435388Smjacob * 5535388Smjacob * Redistribution and use in source and binary forms, with or without 5646967Smjacob * modification, are permitted provided that the following conditions 5746967Smjacob * are met: 5846967Smjacob * 1. Redistributions of source code must retain the above copyright 5946967Smjacob * notice, this list of conditions and the following disclaimer. 6046967Smjacob * 2. Redistributions in binary form must reproduce the above copyright 6146967Smjacob * notice, this list of conditions and the following disclaimer in the 6246967Smjacob * documentation and/or other materials provided with the distribution. 6346967Smjacob * 6435388Smjacob * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 6535388Smjacob * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 6644819Smjacob * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 6735388Smjacob * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 6844819Smjacob * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 6944819Smjacob * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 7035388Smjacob * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 7135388Smjacob * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 7244819Smjacob * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 7335388Smjacob * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 7435388Smjacob * SUCH DAMAGE. 7544819Smjacob */ 7635388Smjacob 7735388Smjacob#include <sys/cdefs.h> 7844819Smjacob__FBSDID("$FreeBSD: head/sys/i386/i386/pmap.c 156930 2006-03-21 06:46:27Z davidxu $"); 7944819Smjacob 8044819Smjacob/* 8144819Smjacob * Manages physical address maps. 8235388Smjacob * 8335388Smjacob * In addition to hardware address maps, this 8435388Smjacob * module is called upon to provide software-use-only 8535388Smjacob * maps which may or may not be stored in the same 8635388Smjacob * form as hardware maps. These pseudo-maps are 8744819Smjacob * used to store intermediate results from copy 8844819Smjacob * operations to and from address spaces. 8944819Smjacob * 9044819Smjacob * Since the information managed by this module is 9144819Smjacob * also stored by the logical address mapping module, 9244819Smjacob * this module may throw away valid virtual-to-physical 9344819Smjacob * mappings at almost any time. However, invalidations 9444819Smjacob * of virtual-to-physical mappings must be done as 9535388Smjacob * requested. 9635388Smjacob * 9735388Smjacob * In order to cope with hardware architectures which 9835388Smjacob * make virtual-to-physical map invalidates expensive, 9944819Smjacob * this module may delay invalidate or reduced protection 10054671Smjacob * operations until such time as they are actually 10154671Smjacob * necessary. This module is given full information as 10254671Smjacob * to which processors are currently using which maps, 10354671Smjacob * and to when physical maps must be made correct. 10454671Smjacob */ 10554671Smjacob 10654671Smjacob#include "opt_cpu.h" 10754671Smjacob#include "opt_pmap.h" 10854671Smjacob#include "opt_msgbuf.h" 10954671Smjacob#include "opt_smp.h" 11054671Smjacob#include "opt_xbox.h" 11154671Smjacob 11244819Smjacob#include <sys/param.h> 11354671Smjacob#include <sys/systm.h> 11444819Smjacob#include <sys/kernel.h> 11544819Smjacob#include <sys/lock.h> 11644819Smjacob#include <sys/malloc.h> 11744819Smjacob#include <sys/mman.h> 11854671Smjacob#include <sys/msgbuf.h> 11935388Smjacob#include <sys/mutex.h> 12054671Smjacob#include <sys/proc.h> 12154671Smjacob#include <sys/sx.h> 12254671Smjacob#include <sys/vmmeter.h> 12354671Smjacob#include <sys/sched.h> 12454671Smjacob#include <sys/sysctl.h> 12554671Smjacob#ifdef SMP 12654671Smjacob#include <sys/smp.h> 12754671Smjacob#endif 12835388Smjacob 12954671Smjacob#include <vm/vm.h> 13035388Smjacob#include <vm/vm_param.h> 13154671Smjacob#include <vm/vm_kern.h> 13254671Smjacob#include <vm/vm_page.h> 13354671Smjacob#include <vm/vm_map.h> 13454671Smjacob#include <vm/vm_object.h> 13554671Smjacob#include <vm/vm_extern.h> 13654671Smjacob#include <vm/vm_pageout.h> 13754671Smjacob#include <vm/vm_pager.h> 13835388Smjacob#include <vm/uma.h> 13954671Smjacob 14054671Smjacob#include <machine/cpu.h> 14135388Smjacob#include <machine/cputypes.h> 14235388Smjacob#include <machine/md_var.h> 14335388Smjacob#include <machine/pcb.h> 14435388Smjacob#include <machine/specialreg.h> 14535388Smjacob#ifdef SMP 14635388Smjacob#include <machine/smp.h> 14735388Smjacob#endif 14835388Smjacob 14935388Smjacob#ifdef XBOX 15035388Smjacob#include <machine/xbox.h> 15135388Smjacob#endif 15235388Smjacob 15335388Smjacob#if !defined(CPU_DISABLE_SSE) && defined(I686_CPU) 15435388Smjacob#define CPU_ENABLE_SSE 15535388Smjacob#endif 15635388Smjacob 15735388Smjacob#ifndef PMAP_SHPGPERPROC 15835388Smjacob#define PMAP_SHPGPERPROC 200 15935388Smjacob#endif 16035388Smjacob 16135388Smjacob#if defined(DIAGNOSTIC) 16235388Smjacob#define PMAP_DIAGNOSTIC 16335388Smjacob#endif 16435388Smjacob 16554671Smjacob#if !defined(PMAP_DIAGNOSTIC) 16654671Smjacob#define PMAP_INLINE __inline 16744819Smjacob#else 16844819Smjacob#define PMAP_INLINE 16945040Smjacob#endif 17035388Smjacob 17135388Smjacob/* 17235388Smjacob * Get PDEs and PTEs for user/kernel address space 17335388Smjacob */ 17435388Smjacob#define pmap_pde(m, v) (&((m)->pm_pdir[(vm_offset_t)(v) >> PDRSHIFT])) 17535388Smjacob#define pdir_pde(m, v) (m[(vm_offset_t)(v) >> PDRSHIFT]) 17635388Smjacob 17735388Smjacob#define pmap_pde_v(pte) ((*(int *)pte & PG_V) != 0) 17835388Smjacob#define pmap_pte_w(pte) ((*(int *)pte & PG_W) != 0) 17935388Smjacob#define pmap_pte_m(pte) ((*(int *)pte & PG_M) != 0) 18035388Smjacob#define pmap_pte_u(pte) ((*(int *)pte & PG_A) != 0) 18135388Smjacob#define pmap_pte_v(pte) ((*(int *)pte & PG_V) != 0) 18235388Smjacob 18335388Smjacob#define pmap_pte_set_w(pte, v) ((v) ? atomic_set_int((u_int *)(pte), PG_W) : \ 18435388Smjacob atomic_clear_int((u_int *)(pte), PG_W)) 18535388Smjacob#define pmap_pte_set_prot(pte, v) ((*(int *)pte &= ~PG_PROT), (*(int *)pte |= (v))) 18635388Smjacob 18735388Smjacobstruct pmap kernel_pmap_store; 18835388SmjacobLIST_HEAD(pmaplist, pmap); 18935388Smjacobstatic struct pmaplist allpmaps; 19035388Smjacobstatic struct mtx allpmaps_lock; 19135388Smjacob 19235388Smjacobvm_paddr_t avail_end; /* PA of last available physical page */ 19335388Smjacobvm_offset_t virtual_avail; /* VA of first avail page (after kernel bss) */ 19435388Smjacobvm_offset_t virtual_end; /* VA of last avail page (end of kernel AS) */ 19535388Smjacobint pgeflag = 0; /* PG_G or-in */ 19635388Smjacobint pseflag = 0; /* PG_PS or-in */ 19735388Smjacob 19835388Smjacobstatic int nkpt; 19946967Smjacobvm_offset_t kernel_vm_end; 20035388Smjacobextern u_int32_t KERNend; 20135388Smjacob 20235388Smjacob#ifdef PAE 20346967Smjacobstatic uma_zone_t pdptzone; 20444819Smjacob#endif 20544819Smjacob 20644819Smjacob/* 20744819Smjacob * Data for the pv entry allocation mechanism 20835388Smjacob */ 20935388Smjacobstatic uma_zone_t pvzone; 21035388Smjacobstatic struct vm_object pvzone_obj; 21135388Smjacobstatic int pv_entry_count = 0, pv_entry_max = 0, pv_entry_high_water = 0; 21235388Smjacob 21335388Smjacob/* 21435388Smjacob * All those kernel PT submaps that BSD is so fond of 21535388Smjacob */ 21635388Smjacobstruct sysmaps { 21735388Smjacob struct mtx lock; 21835388Smjacob pt_entry_t *CMAP1; 21935388Smjacob pt_entry_t *CMAP2; 22035388Smjacob caddr_t CADDR1; 22135388Smjacob caddr_t CADDR2; 22235388Smjacob}; 22335388Smjacobstatic struct sysmaps sysmaps_pcpu[MAXCPU]; 22435388Smjacobpt_entry_t *CMAP1 = 0; 22552346Smjacobstatic pt_entry_t *CMAP3; 22652346Smjacobcaddr_t CADDR1 = 0, ptvmmap = 0; 22735388Smjacobstatic caddr_t CADDR3; 22862170Smjacobstruct msgbuf *msgbufp = 0; 22962170Smjacob 23062170Smjacob/* 23135388Smjacob * Crashdump maps. 23235388Smjacob */ 23335388Smjacobstatic caddr_t crashdumpmap; 23435388Smjacob 23539235Sgibbs#ifdef SMP 23639235Sgibbsextern pt_entry_t *SMPpt; 23739235Sgibbs#endif 23839235Sgibbsstatic pt_entry_t *PMAP1 = 0, *PMAP2; 23939235Sgibbsstatic pt_entry_t *PADDR1 = 0, *PADDR2; 24039235Sgibbs#ifdef SMP 24135388Smjacobstatic int PMAP1cpu; 24235388Smjacobstatic int PMAP1changedcpu; 24335388SmjacobSYSCTL_INT(_debug, OID_AUTO, PMAP1changedcpu, CTLFLAG_RD, 24435388Smjacob &PMAP1changedcpu, 0, 24535388Smjacob "Number of times pmap_pte_quick changed CPU with same PMAP1"); 24635388Smjacob#endif 24735388Smjacobstatic int PMAP1changed; 24835388SmjacobSYSCTL_INT(_debug, OID_AUTO, PMAP1changed, CTLFLAG_RD, 24935388Smjacob &PMAP1changed, 0, 25035388Smjacob "Number of times pmap_pte_quick changed PMAP1"); 25135388Smjacobstatic int PMAP1unchanged; 25235388SmjacobSYSCTL_INT(_debug, OID_AUTO, PMAP1unchanged, CTLFLAG_RD, 25335388Smjacob &PMAP1unchanged, 0, 25435388Smjacob "Number of times pmap_pte_quick didn't change PMAP1"); 25535388Smjacobstatic struct mtx PMAP2mutex; 25635388Smjacob 25735388Smjacobstatic PMAP_INLINE void free_pv_entry(pv_entry_t pv); 25835388Smjacobstatic pv_entry_t get_pv_entry(pmap_t locked_pmap); 25935388Smjacobstatic void pmap_clear_ptes(vm_page_t m, int bit); 26035388Smjacob 26135388Smjacobstatic int pmap_remove_pte(pmap_t pmap, pt_entry_t *ptq, vm_offset_t sva); 26235388Smjacobstatic void pmap_remove_page(struct pmap *pmap, vm_offset_t va); 26335388Smjacobstatic void pmap_remove_entry(struct pmap *pmap, vm_page_t m, 26435388Smjacob vm_offset_t va); 26535388Smjacobstatic void pmap_insert_entry(pmap_t pmap, vm_offset_t va, vm_page_t m); 26635388Smjacob 26735388Smjacobstatic vm_page_t pmap_allocpte(pmap_t pmap, vm_offset_t va, int flags); 26835388Smjacob 26935388Smjacobstatic vm_page_t _pmap_allocpte(pmap_t pmap, unsigned ptepindex, int flags); 27035388Smjacobstatic int _pmap_unwire_pte_hold(pmap_t pmap, vm_page_t m); 27135388Smjacobstatic pt_entry_t *pmap_pte_quick(pmap_t pmap, vm_offset_t va); 27235388Smjacobstatic void pmap_pte_release(pt_entry_t *pte); 27335388Smjacobstatic int pmap_unuse_pt(pmap_t, vm_offset_t); 27435388Smjacobstatic vm_offset_t pmap_kmem_choose(vm_offset_t addr); 27535388Smjacob#ifdef PAE 27635388Smjacobstatic void *pmap_pdpt_allocf(uma_zone_t zone, int bytes, u_int8_t *flags, int wait); 27735388Smjacob#endif 27835388Smjacob 27935388SmjacobCTASSERT(1 << PDESHIFT == sizeof(pd_entry_t)); 28035388SmjacobCTASSERT(1 << PTESHIFT == sizeof(pt_entry_t)); 28135388Smjacob 28235388Smjacob/* 28335388Smjacob * Move the kernel virtual free pointer to the next 28435388Smjacob * 4MB. This is used to help improve performance 28535388Smjacob * by using a large (4MB) page for much of the kernel 28635388Smjacob * (.text, .data, .bss) 28735388Smjacob */ 28835388Smjacobstatic vm_offset_t 28935388Smjacobpmap_kmem_choose(vm_offset_t addr) 29035388Smjacob{ 29135388Smjacob vm_offset_t newaddr = addr; 29235388Smjacob 29335388Smjacob#ifndef DISABLE_PSE 29435388Smjacob if (cpu_feature & CPUID_PSE) 29535388Smjacob newaddr = (addr + PDRMASK) & ~PDRMASK; 29635388Smjacob#endif 29735388Smjacob return newaddr; 29835388Smjacob} 29935388Smjacob 30035388Smjacob/* 30135388Smjacob * Bootstrap the system enough to run with virtual memory. 30235388Smjacob * 30335388Smjacob * On the i386 this is called after mapping has already been enabled 30435388Smjacob * and just syncs the pmap module with what has already been done. 30535388Smjacob * [We can't call it easily with mapping off since the kernel is not 30635388Smjacob * mapped with PA == VA, hence we would have to relocate every address 30735388Smjacob * from the linked base (virtual) address "KERNBASE" to the actual 30835388Smjacob * (physical) address starting relative to 0] 30935388Smjacob */ 31035388Smjacobvoid 31135388Smjacobpmap_bootstrap(firstaddr, loadaddr) 31235388Smjacob vm_paddr_t firstaddr; 31335388Smjacob vm_paddr_t loadaddr; 31435388Smjacob{ 31535388Smjacob vm_offset_t va; 31635388Smjacob pt_entry_t *pte, *unused; 31735388Smjacob struct sysmaps *sysmaps; 31835388Smjacob int i; 31935388Smjacob 32035388Smjacob /* 32135388Smjacob * XXX The calculation of virtual_avail is wrong. It's NKPT*PAGE_SIZE too 32235388Smjacob * large. It should instead be correctly calculated in locore.s and 32335388Smjacob * not based on 'first' (which is a physical address, not a virtual 32435388Smjacob * address, for the start of unused physical memory). The kernel 32554671Smjacob * page tables are NOT double mapped and thus should not be included 32654671Smjacob * in this calculation. 32754671Smjacob */ 32854671Smjacob virtual_avail = (vm_offset_t) KERNBASE + firstaddr; 32954671Smjacob virtual_avail = pmap_kmem_choose(virtual_avail); 33054671Smjacob 33154671Smjacob virtual_end = VM_MAX_KERNEL_ADDRESS; 33254671Smjacob 33335388Smjacob /* 33454671Smjacob * Initialize the kernel pmap (which is statically allocated). 33554671Smjacob */ 33654671Smjacob PMAP_LOCK_INIT(kernel_pmap); 33754671Smjacob kernel_pmap->pm_pdir = (pd_entry_t *) (KERNBASE + (u_int)IdlePTD); 33854671Smjacob#ifdef PAE 33954671Smjacob kernel_pmap->pm_pdpt = (pdpt_entry_t *) (KERNBASE + (u_int)IdlePDPT); 34054671Smjacob#endif 34154671Smjacob kernel_pmap->pm_active = -1; /* don't allow deactivation */ 34235388Smjacob TAILQ_INIT(&kernel_pmap->pm_pvlist); 34362170Smjacob LIST_INIT(&allpmaps); 34435388Smjacob mtx_init(&allpmaps_lock, "allpmaps", NULL, MTX_SPIN); 34535388Smjacob mtx_lock_spin(&allpmaps_lock); 34635388Smjacob LIST_INSERT_HEAD(&allpmaps, kernel_pmap, pm_list); 34762170Smjacob mtx_unlock_spin(&allpmaps_lock); 34862170Smjacob nkpt = NKPT; 34962170Smjacob 35035388Smjacob /* 35162170Smjacob * Reserve some special page table entries/VA space for temporary 35262170Smjacob * mapping of pages. 35335388Smjacob */ 35435388Smjacob#define SYSMAP(c, p, v, n) \ 35535388Smjacob v = (c)va; va += ((n)*PAGE_SIZE); p = pte; pte += (n); 35654671Smjacob 35754671Smjacob va = virtual_avail; 35854671Smjacob pte = vtopte(va); 35954671Smjacob 36054671Smjacob /* 36154671Smjacob * CMAP1/CMAP2 are used for zeroing and copying pages. 36254671Smjacob * CMAP3 is used for the idle process page zeroing. 36354671Smjacob */ 36454671Smjacob for (i = 0; i < MAXCPU; i++) { 36554671Smjacob sysmaps = &sysmaps_pcpu[i]; 36654671Smjacob mtx_init(&sysmaps->lock, "SYSMAPS", NULL, MTX_DEF); 36754671Smjacob SYSMAP(caddr_t, sysmaps->CMAP1, sysmaps->CADDR1, 1) 36854671Smjacob SYSMAP(caddr_t, sysmaps->CMAP2, sysmaps->CADDR2, 1) 36954671Smjacob } 37054671Smjacob SYSMAP(caddr_t, CMAP1, CADDR1, 1) 37154671Smjacob SYSMAP(caddr_t, CMAP3, CADDR3, 1) 37254671Smjacob *CMAP3 = 0; 37354671Smjacob 37454671Smjacob /* 37554671Smjacob * Crashdump maps. 37654671Smjacob */ 37754671Smjacob SYSMAP(caddr_t, unused, crashdumpmap, MAXDUMPPGS) 37854671Smjacob 37954671Smjacob /* 38054671Smjacob * ptvmmap is used for reading arbitrary physical pages via /dev/mem. 38154671Smjacob */ 38254671Smjacob SYSMAP(caddr_t, unused, ptvmmap, 1) 38354671Smjacob 38454671Smjacob /* 38554671Smjacob * msgbufp is used to map the system message buffer. 38654671Smjacob */ 38754671Smjacob SYSMAP(struct msgbuf *, unused, msgbufp, atop(round_page(MSGBUF_SIZE))) 38854671Smjacob 38954671Smjacob /* 39054671Smjacob * ptemap is used for pmap_pte_quick 39154671Smjacob */ 39254671Smjacob SYSMAP(pt_entry_t *, PMAP1, PADDR1, 1); 39354671Smjacob SYSMAP(pt_entry_t *, PMAP2, PADDR2, 1); 39454671Smjacob 39535388Smjacob mtx_init(&PMAP2mutex, "PMAP2", NULL, MTX_DEF); 39654671Smjacob 39754671Smjacob virtual_avail = va; 39835388Smjacob 39954671Smjacob *CMAP1 = 0; 40035388Smjacob 40135388Smjacob#ifdef XBOX 40235388Smjacob /* FIXME: This is gross, but needed for the XBOX. Since we are in such 40335388Smjacob * an early stadium, we cannot yet neatly map video memory ... :-( 40435388Smjacob * Better fixes are very welcome! */ 40535388Smjacob if (!arch_i386_is_xbox) 40635388Smjacob#endif 40735388Smjacob for (i = 0; i < NKPT; i++) 40835388Smjacob PTD[i] = 0; 40935388Smjacob 41035388Smjacob /* Turn on PG_G on kernel page(s) */ 41135388Smjacob pmap_set_pg(); 41235388Smjacob} 41335388Smjacob 41435388Smjacob/* 41535388Smjacob * Set PG_G on kernel pages. Only the BSP calls this when SMP is turned on. 41635388Smjacob */ 41735388Smjacobvoid 41835388Smjacobpmap_set_pg(void) 41935388Smjacob{ 42035388Smjacob pd_entry_t pdir; 42135388Smjacob pt_entry_t *pte; 42235388Smjacob vm_offset_t va, endva; 42335388Smjacob int i; 42435388Smjacob 42535388Smjacob if (pgeflag == 0) 42635388Smjacob return; 42735388Smjacob 42835388Smjacob i = KERNLOAD/NBPDR; 42935388Smjacob endva = KERNBASE + KERNend; 43035388Smjacob 43135388Smjacob if (pseflag) { 43235388Smjacob va = KERNBASE + KERNLOAD; 43335388Smjacob while (va < endva) { 43435388Smjacob pdir = kernel_pmap->pm_pdir[KPTDI+i]; 43535388Smjacob pdir |= pgeflag; 43635388Smjacob kernel_pmap->pm_pdir[KPTDI+i] = PTD[KPTDI+i] = pdir; 43735388Smjacob invltlb(); /* Play it safe, invltlb() every time */ 43835388Smjacob i++; 43935388Smjacob va += NBPDR; 44035388Smjacob } 44135388Smjacob } else { 44235388Smjacob va = (vm_offset_t)btext; 44335388Smjacob while (va < endva) { 44435388Smjacob pte = vtopte(va); 44535388Smjacob if (*pte) 44635388Smjacob *pte |= pgeflag; 44735388Smjacob invltlb(); /* Play it safe, invltlb() every time */ 44835388Smjacob va += PAGE_SIZE; 44935388Smjacob } 45035388Smjacob } 45135388Smjacob} 45235388Smjacob 45335388Smjacob/* 45435388Smjacob * Initialize a vm_page's machine-dependent fields. 45535388Smjacob */ 45635388Smjacobvoid 45735388Smjacobpmap_page_init(vm_page_t m) 45835388Smjacob{ 45935388Smjacob 46035388Smjacob TAILQ_INIT(&m->md.pv_list); 46135388Smjacob m->md.pv_list_count = 0; 46235388Smjacob} 46335388Smjacob 46435388Smjacob#ifdef PAE 46535388Smjacob 46635388Smjacobstatic MALLOC_DEFINE(M_PMAPPDPT, "pmap", "pmap pdpt"); 46735388Smjacob 46835388Smjacobstatic void * 46935388Smjacobpmap_pdpt_allocf(uma_zone_t zone, int bytes, u_int8_t *flags, int wait) 47035388Smjacob{ 47135388Smjacob *flags = UMA_SLAB_PRIV; 47235388Smjacob return (contigmalloc(PAGE_SIZE, M_PMAPPDPT, 0, 0x0ULL, 0xffffffffULL, 47335388Smjacob 1, 0)); 47435388Smjacob} 47535388Smjacob#endif 47635388Smjacob 47735388Smjacob/* 47835388Smjacob * Initialize the pmap module. 47935388Smjacob * Called by vm_init, to initialize any structures that the pmap 48035388Smjacob * system needs to map virtual memory. 48135388Smjacob */ 48235388Smjacobvoid 48335388Smjacobpmap_init(void) 48435388Smjacob{ 48535388Smjacob int shpgperproc = PMAP_SHPGPERPROC; 48635388Smjacob 48735388Smjacob /* 48835388Smjacob * Initialize the address space (zone) for the pv entries. Set a 48935388Smjacob * high water mark so that the system can recover from excessive 49035388Smjacob * numbers of pv entries. 49135388Smjacob */ 49235388Smjacob pvzone = uma_zcreate("PV ENTRY", sizeof(struct pv_entry), NULL, NULL, 49335388Smjacob NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_VM | UMA_ZONE_NOFREE); 49435388Smjacob TUNABLE_INT_FETCH("vm.pmap.shpgperproc", &shpgperproc); 49535388Smjacob pv_entry_max = shpgperproc * maxproc + cnt.v_page_count; 49635388Smjacob TUNABLE_INT_FETCH("vm.pmap.pv_entries", &pv_entry_max); 49735388Smjacob pv_entry_high_water = 9 * (pv_entry_max / 10); 49835388Smjacob uma_zone_set_obj(pvzone, &pvzone_obj, pv_entry_max); 49935388Smjacob 50035388Smjacob#ifdef PAE 50135388Smjacob pdptzone = uma_zcreate("PDPT", NPGPTD * sizeof(pdpt_entry_t), NULL, 50235388Smjacob NULL, NULL, NULL, (NPGPTD * sizeof(pdpt_entry_t)) - 1, 50335388Smjacob UMA_ZONE_VM | UMA_ZONE_NOFREE); 50435388Smjacob uma_zone_set_allocf(pdptzone, pmap_pdpt_allocf); 50535388Smjacob#endif 50635388Smjacob} 50735388Smjacob 50835388Smjacob 50935388Smjacob/*************************************************** 51035388Smjacob * Low level helper routines..... 51135388Smjacob ***************************************************/ 51235388Smjacob 51335388Smjacob 51435388Smjacob/* 51535388Smjacob * this routine defines the region(s) of memory that should 51635388Smjacob * not be tested for the modified bit. 51735388Smjacob */ 51835388Smjacobstatic PMAP_INLINE int 51935388Smjacobpmap_track_modified(vm_offset_t va) 52035388Smjacob{ 52135388Smjacob if ((va < kmi.clean_sva) || (va >= kmi.clean_eva)) 52235388Smjacob return 1; 52335388Smjacob else 52435388Smjacob return 0; 52535388Smjacob} 52654671Smjacob 52745040Smjacob#ifdef SMP 52845040Smjacob/* 52945040Smjacob * For SMP, these functions have to use the IPI mechanism for coherence. 53045040Smjacob */ 53145040Smjacobvoid 53245040Smjacobpmap_invalidate_page(pmap_t pmap, vm_offset_t va) 53345040Smjacob{ 53445040Smjacob u_int cpumask; 53545040Smjacob u_int other_cpus; 53645040Smjacob 53745040Smjacob if (smp_started) { 53835388Smjacob if (!(read_eflags() & PSL_I)) 53935388Smjacob panic("%s: interrupts disabled", __func__); 54035388Smjacob mtx_lock_spin(&smp_ipi_mtx); 54135388Smjacob } else 54235388Smjacob critical_enter(); 54335388Smjacob /* 54435388Smjacob * We need to disable interrupt preemption but MUST NOT have 54535388Smjacob * interrupts disabled here. 54635388Smjacob * XXX we may need to hold schedlock to get a coherent pm_active 54735388Smjacob * XXX critical sections disable interrupts again 54835388Smjacob */ 54935388Smjacob if (pmap == kernel_pmap || pmap->pm_active == all_cpus) { 55035388Smjacob invlpg(va); 55135388Smjacob smp_invlpg(va); 55235388Smjacob } else { 55335388Smjacob cpumask = PCPU_GET(cpumask); 55435388Smjacob other_cpus = PCPU_GET(other_cpus); 55535388Smjacob if (pmap->pm_active & cpumask) 55635388Smjacob invlpg(va); 55735388Smjacob if (pmap->pm_active & other_cpus) 55835388Smjacob smp_masked_invlpg(pmap->pm_active & other_cpus, va); 55935388Smjacob } 56035388Smjacob if (smp_started) 56135388Smjacob mtx_unlock_spin(&smp_ipi_mtx); 56235388Smjacob else 56335388Smjacob critical_exit(); 56435388Smjacob} 56535388Smjacob 56635388Smjacobvoid 56735388Smjacobpmap_invalidate_range(pmap_t pmap, vm_offset_t sva, vm_offset_t eva) 56835388Smjacob{ 56943420Smjacob u_int cpumask; 57035388Smjacob u_int other_cpus; 57135388Smjacob vm_offset_t addr; 57235388Smjacob 57335388Smjacob if (smp_started) { 57435388Smjacob if (!(read_eflags() & PSL_I)) 57535388Smjacob panic("%s: interrupts disabled", __func__); 57635388Smjacob mtx_lock_spin(&smp_ipi_mtx); 57735388Smjacob } else 57835388Smjacob critical_enter(); 57935388Smjacob /* 58035388Smjacob * We need to disable interrupt preemption but MUST NOT have 58135388Smjacob * interrupts disabled here. 58235388Smjacob * XXX we may need to hold schedlock to get a coherent pm_active 58335388Smjacob * XXX critical sections disable interrupts again 58435388Smjacob */ 58535388Smjacob if (pmap == kernel_pmap || pmap->pm_active == all_cpus) { 58635388Smjacob for (addr = sva; addr < eva; addr += PAGE_SIZE) 58735388Smjacob invlpg(addr); 58839235Sgibbs smp_invlpg_range(sva, eva); 58939235Sgibbs } else { 59039235Sgibbs cpumask = PCPU_GET(cpumask); 59139235Sgibbs other_cpus = PCPU_GET(other_cpus); 59235388Smjacob if (pmap->pm_active & cpumask) 59335388Smjacob for (addr = sva; addr < eva; addr += PAGE_SIZE) 59435388Smjacob invlpg(addr); 59535388Smjacob if (pmap->pm_active & other_cpus) 59635388Smjacob smp_masked_invlpg_range(pmap->pm_active & other_cpus, 59735388Smjacob sva, eva); 59835388Smjacob } 59935388Smjacob if (smp_started) 60035388Smjacob mtx_unlock_spin(&smp_ipi_mtx); 60135388Smjacob else 60235388Smjacob critical_exit(); 60335388Smjacob} 60435388Smjacob 60535388Smjacobvoid 60635388Smjacobpmap_invalidate_all(pmap_t pmap) 60735388Smjacob{ 60835388Smjacob u_int cpumask; 60935388Smjacob u_int other_cpus; 61035388Smjacob 61135388Smjacob if (smp_started) { 61235388Smjacob if (!(read_eflags() & PSL_I)) 61335388Smjacob panic("%s: interrupts disabled", __func__); 61435388Smjacob mtx_lock_spin(&smp_ipi_mtx); 61535388Smjacob } else 61635388Smjacob critical_enter(); 61735388Smjacob /* 61835388Smjacob * We need to disable interrupt preemption but MUST NOT have 61935388Smjacob * interrupts disabled here. 62035388Smjacob * XXX we may need to hold schedlock to get a coherent pm_active 62135388Smjacob * XXX critical sections disable interrupts again 62235388Smjacob */ 62335388Smjacob if (pmap == kernel_pmap || pmap->pm_active == all_cpus) { 62435388Smjacob invltlb(); 62535388Smjacob smp_invltlb(); 62635388Smjacob } else { 62735388Smjacob cpumask = PCPU_GET(cpumask); 62839235Sgibbs other_cpus = PCPU_GET(other_cpus); 62939235Sgibbs if (pmap->pm_active & cpumask) 63046967Smjacob invltlb(); 63146967Smjacob if (pmap->pm_active & other_cpus) 63246967Smjacob smp_masked_invltlb(pmap->pm_active & other_cpus); 63346967Smjacob } 63446967Smjacob if (smp_started) 63546967Smjacob mtx_unlock_spin(&smp_ipi_mtx); 63646967Smjacob else 63739235Sgibbs critical_exit(); 63839235Sgibbs} 63939235Sgibbs#else /* !SMP */ 64039235Sgibbs/* 64139235Sgibbs * Normal, non-SMP, 486+ invalidation functions. 64239235Sgibbs * We inline these within pmap.c for speed. 64339235Sgibbs */ 64439235SgibbsPMAP_INLINE void 64545040Smjacobpmap_invalidate_page(pmap_t pmap, vm_offset_t va) 64639235Sgibbs{ 64739235Sgibbs 64839235Sgibbs if (pmap == kernel_pmap || pmap->pm_active) 64939235Sgibbs invlpg(va); 65039235Sgibbs} 65139235Sgibbs 65239235SgibbsPMAP_INLINE void 65339235Sgibbspmap_invalidate_range(pmap_t pmap, vm_offset_t sva, vm_offset_t eva) 65439235Sgibbs{ 65539235Sgibbs vm_offset_t addr; 65639235Sgibbs 65739235Sgibbs if (pmap == kernel_pmap || pmap->pm_active) 65839235Sgibbs for (addr = sva; addr < eva; addr += PAGE_SIZE) 65939235Sgibbs invlpg(addr); 66039235Sgibbs} 66139235Sgibbs 66239235SgibbsPMAP_INLINE void 66339235Sgibbspmap_invalidate_all(pmap_t pmap) 66439235Sgibbs{ 66539235Sgibbs 66639235Sgibbs if (pmap == kernel_pmap || pmap->pm_active) 66739235Sgibbs invltlb(); 66839235Sgibbs} 66939235Sgibbs#endif /* !SMP */ 67039235Sgibbs 67139235Sgibbs/* 67239235Sgibbs * Are we current address space or kernel? N.B. We return FALSE when 67339235Sgibbs * a pmap's page table is in use because a kernel thread is borrowing 67439235Sgibbs * it. The borrowed page table can change spontaneously, making any 67539235Sgibbs * dependence on its continued use subject to a race condition. 67639235Sgibbs */ 67739235Sgibbsstatic __inline int 67839235Sgibbspmap_is_current(pmap_t pmap) 67939235Sgibbs{ 68039235Sgibbs 68139235Sgibbs return (pmap == kernel_pmap || 68239235Sgibbs (pmap == vmspace_pmap(curthread->td_proc->p_vmspace) && 68339235Sgibbs (pmap->pm_pdir[PTDPTDI] & PG_FRAME) == (PTDpde[0] & PG_FRAME))); 68439235Sgibbs} 68539235Sgibbs 68639235Sgibbs/* 68739235Sgibbs * If the given pmap is not the current or kernel pmap, the returned pte must 68839235Sgibbs * be released by passing it to pmap_pte_release(). 68939235Sgibbs */ 69039235Sgibbspt_entry_t * 69139235Sgibbspmap_pte(pmap_t pmap, vm_offset_t va) 69239235Sgibbs{ 69339235Sgibbs pd_entry_t newpf; 69439235Sgibbs pd_entry_t *pde; 69539235Sgibbs 69646967Smjacob pde = pmap_pde(pmap, va); 69746967Smjacob if (*pde & PG_PS) 69846967Smjacob return (pde); 69946967Smjacob if (*pde != 0) { 70046967Smjacob /* are we current address space or kernel? */ 70146967Smjacob if (pmap_is_current(pmap)) 70246967Smjacob return (vtopte(va)); 70346967Smjacob mtx_lock(&PMAP2mutex); 70446967Smjacob newpf = *pde & PG_FRAME; 70546967Smjacob if ((*PMAP2 & PG_FRAME) != newpf) { 70646967Smjacob *PMAP2 = newpf | PG_RW | PG_V | PG_A | PG_M; 70746967Smjacob pmap_invalidate_page(kernel_pmap, (vm_offset_t)PADDR2); 70846967Smjacob } 70946967Smjacob return (PADDR2 + (i386_btop(va) & (NPTEPG - 1))); 71061769Smjacob } 71161769Smjacob return (0); 71261769Smjacob} 71361769Smjacob 71461769Smjacob/* 71561769Smjacob * Releases a pte that was obtained from pmap_pte(). Be prepared for the pte 71661769Smjacob * being NULL. 71746967Smjacob */ 71846967Smjacobstatic __inline void 71946967Smjacobpmap_pte_release(pt_entry_t *pte) 72046967Smjacob{ 72161769Smjacob 72261769Smjacob if ((pt_entry_t *)((vm_offset_t)pte & ~PAGE_MASK) == PADDR2) 72361769Smjacob mtx_unlock(&PMAP2mutex); 72461769Smjacob} 72561769Smjacob 72661769Smjacobstatic __inline void 72761769Smjacobinvlcaddr(void *caddr) 72861769Smjacob{ 72961769Smjacob 73046967Smjacob invlpg((u_int)caddr); 73146967Smjacob} 73246967Smjacob 73346967Smjacob/* 73446967Smjacob * Super fast pmap_pte routine best used when scanning 73546967Smjacob * the pv lists. This eliminates many coarse-grained 73646967Smjacob * invltlb calls. Note that many of the pv list 73746967Smjacob * scans are across different pmaps. It is very wasteful 73846967Smjacob * to do an entire invltlb for checking a single mapping. 73946967Smjacob * 74046967Smjacob * If the given pmap is not the current pmap, vm_page_queue_mtx 74146967Smjacob * must be held and curthread pinned to a CPU. 74246967Smjacob */ 74346967Smjacobstatic pt_entry_t * 74457148Smjacobpmap_pte_quick(pmap_t pmap, vm_offset_t va) 74557148Smjacob{ 74646967Smjacob pd_entry_t newpf; 74746967Smjacob pd_entry_t *pde; 74846967Smjacob 74946967Smjacob pde = pmap_pde(pmap, va); 75046967Smjacob if (*pde & PG_PS) 75146967Smjacob return (pde); 75246967Smjacob if (*pde != 0) { 75346967Smjacob /* are we current address space or kernel? */ 75446967Smjacob if (pmap_is_current(pmap)) 75546967Smjacob return (vtopte(va)); 75646967Smjacob mtx_assert(&vm_page_queue_mtx, MA_OWNED); 75746967Smjacob KASSERT(curthread->td_pinned > 0, ("curthread not pinned")); 75846967Smjacob newpf = *pde & PG_FRAME; 75946967Smjacob if ((*PMAP1 & PG_FRAME) != newpf) { 76046967Smjacob *PMAP1 = newpf | PG_RW | PG_V | PG_A | PG_M; 76146967Smjacob#ifdef SMP 76246967Smjacob PMAP1cpu = PCPU_GET(cpuid); 76346967Smjacob#endif 76446967Smjacob invlcaddr(PADDR1); 76546967Smjacob PMAP1changed++; 76646967Smjacob } else 76746967Smjacob#ifdef SMP 76846967Smjacob if (PMAP1cpu != PCPU_GET(cpuid)) { 76946967Smjacob PMAP1cpu = PCPU_GET(cpuid); 77046967Smjacob invlcaddr(PADDR1); 77146967Smjacob PMAP1changedcpu++; 77246967Smjacob } else 77346967Smjacob#endif 77446967Smjacob PMAP1unchanged++; 77546967Smjacob return (PADDR1 + (i386_btop(va) & (NPTEPG - 1))); 77646967Smjacob } 77746967Smjacob return (0); 77846967Smjacob} 77946967Smjacob 78046967Smjacob/* 78146967Smjacob * Routine: pmap_extract 78246967Smjacob * Function: 78346967Smjacob * Extract the physical page address associated 78446967Smjacob * with the given map/virtual_address pair. 78546967Smjacob */ 78646967Smjacobvm_paddr_t 78746967Smjacobpmap_extract(pmap_t pmap, vm_offset_t va) 78846967Smjacob{ 78946967Smjacob vm_paddr_t rtval; 79046967Smjacob pt_entry_t *pte; 79146967Smjacob pd_entry_t pde; 79246967Smjacob 79346967Smjacob rtval = 0; 79446967Smjacob PMAP_LOCK(pmap); 79546967Smjacob pde = pmap->pm_pdir[va >> PDRSHIFT]; 79646967Smjacob if (pde != 0) { 79746967Smjacob if ((pde & PG_PS) != 0) { 79846967Smjacob rtval = (pde & ~PDRMASK) | (va & PDRMASK); 79946967Smjacob PMAP_UNLOCK(pmap); 80046967Smjacob return rtval; 80146967Smjacob } 80246967Smjacob pte = pmap_pte(pmap, va); 80346967Smjacob rtval = (*pte & PG_FRAME) | (va & PAGE_MASK); 80457148Smjacob pmap_pte_release(pte); 80557148Smjacob } 80657148Smjacob PMAP_UNLOCK(pmap); 80757148Smjacob return (rtval); 80857148Smjacob} 80957148Smjacob 81057148Smjacob/* 81157148Smjacob * Routine: pmap_extract_and_hold 81257148Smjacob * Function: 81357148Smjacob * Atomically extract and hold the physical page 81457148Smjacob * with the given pmap and virtual address pair 81557148Smjacob * if that mapping permits the given protection. 81657148Smjacob */ 81757148Smjacobvm_page_t 81857148Smjacobpmap_extract_and_hold(pmap_t pmap, vm_offset_t va, vm_prot_t prot) 81957148Smjacob{ 82057148Smjacob pd_entry_t pde; 82157148Smjacob pt_entry_t pte; 82257148Smjacob vm_page_t m; 82357148Smjacob 82457148Smjacob m = NULL; 82557148Smjacob vm_page_lock_queues(); 82657148Smjacob PMAP_LOCK(pmap); 82757148Smjacob pde = *pmap_pde(pmap, va); 82857148Smjacob if (pde != 0) { 82957148Smjacob if (pde & PG_PS) { 83057148Smjacob if ((pde & PG_RW) || (prot & VM_PROT_WRITE) == 0) { 83157148Smjacob m = PHYS_TO_VM_PAGE((pde & ~PDRMASK) | 83257148Smjacob (va & PDRMASK)); 83357148Smjacob vm_page_hold(m); 83457148Smjacob } 83557148Smjacob } else { 83657148Smjacob sched_pin(); 83757148Smjacob pte = *pmap_pte_quick(pmap, va); 83857148Smjacob if (pte != 0 && 83957148Smjacob ((pte & PG_RW) || (prot & VM_PROT_WRITE) == 0)) { 84057148Smjacob m = PHYS_TO_VM_PAGE(pte & PG_FRAME); 84157148Smjacob vm_page_hold(m); 84257148Smjacob } 84357148Smjacob sched_unpin(); 84457148Smjacob } 84557148Smjacob } 84657148Smjacob vm_page_unlock_queues(); 84757148Smjacob PMAP_UNLOCK(pmap); 84857148Smjacob return (m); 84957148Smjacob} 85057148Smjacob 85157148Smjacob/*************************************************** 85257148Smjacob * Low level mapping routines..... 85357148Smjacob ***************************************************/ 85457148Smjacob 85557148Smjacob/* 85657148Smjacob * Add a wired page to the kva. 85757148Smjacob * Note: not SMP coherent. 85857148Smjacob */ 85957148SmjacobPMAP_INLINE void 86057148Smjacobpmap_kenter(vm_offset_t va, vm_paddr_t pa) 86157148Smjacob{ 86257148Smjacob pt_entry_t *pte; 86357148Smjacob 86457148Smjacob pte = vtopte(va); 86557148Smjacob pte_store(pte, pa | PG_RW | PG_V | pgeflag); 86657148Smjacob} 86757148Smjacob 86857148Smjacob/* 86957148Smjacob * Remove a page from the kernel pagetables. 87057148Smjacob * Note: not SMP coherent. 87157148Smjacob */ 87257148SmjacobPMAP_INLINE void 87357148Smjacobpmap_kremove(vm_offset_t va) 87457148Smjacob{ 87557148Smjacob pt_entry_t *pte; 87657148Smjacob 87757148Smjacob pte = vtopte(va); 87846967Smjacob pte_clear(pte); 87939235Sgibbs} 88039235Sgibbs 88139235Sgibbs/* 88239235Sgibbs * Used to map a range of physical addresses into kernel 88339235Sgibbs * virtual address space. 88439235Sgibbs * 88539235Sgibbs * The value passed in '*virt' is a suggested virtual address for 88639235Sgibbs * the mapping. Architectures which can support a direct-mapped 88739235Sgibbs * physical to virtual region can return the appropriate address 88839235Sgibbs * within that region, leaving '*virt' unchanged. Other 88939235Sgibbs * architectures should map the pages starting at '*virt' and 89039235Sgibbs * update '*virt' with the first usable address after the mapped 89143792Smjacob * region. 89239235Sgibbs */ 89339235Sgibbsvm_offset_t 89439235Sgibbspmap_map(vm_offset_t *virt, vm_paddr_t start, vm_paddr_t end, int prot) 89539235Sgibbs{ 89639235Sgibbs vm_offset_t va, sva; 89739235Sgibbs 89860218Smjacob va = sva = *virt; 89939235Sgibbs while (start < end) { 90039235Sgibbs pmap_kenter(va, start); 90139235Sgibbs va += PAGE_SIZE; 90239235Sgibbs start += PAGE_SIZE; 90339235Sgibbs } 90439235Sgibbs pmap_invalidate_range(kernel_pmap, sva, va); 90539235Sgibbs *virt = va; 90639235Sgibbs return (sva); 90760218Smjacob} 90841518Smjacob 90939235Sgibbs 91060218Smjacob/* 91160218Smjacob * Add a list of wired pages to the kva 91260218Smjacob * this routine is only used for temporary 91360218Smjacob * kernel mappings that do not need to have 91460218Smjacob * page modification or references recorded. 91560218Smjacob * Note that old mappings are simply written 91660218Smjacob * over. The page *must* be wired. 91760218Smjacob * Note: SMP coherent. Uses a ranged shootdown IPI. 91860218Smjacob */ 91960218Smjacobvoid 92043792Smjacobpmap_qenter(vm_offset_t sva, vm_page_t *m, int count) 92139235Sgibbs{ 92239235Sgibbs vm_offset_t va; 92339235Sgibbs 92439235Sgibbs va = sva; 92539235Sgibbs while (count-- > 0) { 92639235Sgibbs pmap_kenter(va, VM_PAGE_TO_PHYS(*m)); 92739235Sgibbs va += PAGE_SIZE; 92845040Smjacob m++; 92939235Sgibbs } 93039235Sgibbs pmap_invalidate_range(kernel_pmap, sva, va); 93139235Sgibbs} 93239235Sgibbs 93339235Sgibbs/* 93439235Sgibbs * This routine tears out page mappings from the 93539235Sgibbs * kernel -- it is meant only for temporary mappings. 93639235Sgibbs * Note: SMP coherent. Uses a ranged shootdown IPI. 93743792Smjacob */ 93839235Sgibbsvoid 93939235Sgibbspmap_qremove(vm_offset_t sva, int count) 94035388Smjacob{ 941 vm_offset_t va; 942 943 va = sva; 944 while (count-- > 0) { 945 pmap_kremove(va); 946 va += PAGE_SIZE; 947 } 948 pmap_invalidate_range(kernel_pmap, sva, va); 949} 950 951/*************************************************** 952 * Page table page management routines..... 953 ***************************************************/ 954 955/* 956 * This routine unholds page table pages, and if the hold count 957 * drops to zero, then it decrements the wire count. 958 */ 959static PMAP_INLINE int 960pmap_unwire_pte_hold(pmap_t pmap, vm_page_t m) 961{ 962 963 --m->wire_count; 964 if (m->wire_count == 0) 965 return _pmap_unwire_pte_hold(pmap, m); 966 else 967 return 0; 968} 969 970static int 971_pmap_unwire_pte_hold(pmap_t pmap, vm_page_t m) 972{ 973 vm_offset_t pteva; 974 975 /* 976 * unmap the page table page 977 */ 978 pmap->pm_pdir[m->pindex] = 0; 979 --pmap->pm_stats.resident_count; 980 981 /* 982 * Do an invltlb to make the invalidated mapping 983 * take effect immediately. 984 */ 985 pteva = VM_MAXUSER_ADDRESS + i386_ptob(m->pindex); 986 pmap_invalidate_page(pmap, pteva); 987 988 vm_page_free_zero(m); 989 atomic_subtract_int(&cnt.v_wire_count, 1); 990 return 1; 991} 992 993/* 994 * After removing a page table entry, this routine is used to 995 * conditionally free the page, and manage the hold/wire counts. 996 */ 997static int 998pmap_unuse_pt(pmap_t pmap, vm_offset_t va) 999{ 1000 pd_entry_t ptepde; 1001 vm_page_t mpte; 1002 1003 if (va >= VM_MAXUSER_ADDRESS) 1004 return 0; 1005 ptepde = *pmap_pde(pmap, va); 1006 mpte = PHYS_TO_VM_PAGE(ptepde & PG_FRAME); 1007 return pmap_unwire_pte_hold(pmap, mpte); 1008} 1009 1010void 1011pmap_pinit0(pmap) 1012 struct pmap *pmap; 1013{ 1014 1015 PMAP_LOCK_INIT(pmap); 1016 pmap->pm_pdir = (pd_entry_t *)(KERNBASE + (vm_offset_t)IdlePTD); 1017#ifdef PAE 1018 pmap->pm_pdpt = (pdpt_entry_t *)(KERNBASE + (vm_offset_t)IdlePDPT); 1019#endif 1020 pmap->pm_active = 0; 1021 PCPU_SET(curpmap, pmap); 1022 TAILQ_INIT(&pmap->pm_pvlist); 1023 bzero(&pmap->pm_stats, sizeof pmap->pm_stats); 1024 mtx_lock_spin(&allpmaps_lock); 1025 LIST_INSERT_HEAD(&allpmaps, pmap, pm_list); 1026 mtx_unlock_spin(&allpmaps_lock); 1027} 1028 1029/* 1030 * Initialize a preallocated and zeroed pmap structure, 1031 * such as one in a vmspace structure. 1032 */ 1033void 1034pmap_pinit(pmap) 1035 register struct pmap *pmap; 1036{ 1037 vm_page_t m, ptdpg[NPGPTD]; 1038 vm_paddr_t pa; 1039 static int color; 1040 int i; 1041 1042 PMAP_LOCK_INIT(pmap); 1043 1044 /* 1045 * No need to allocate page table space yet but we do need a valid 1046 * page directory table. 1047 */ 1048 if (pmap->pm_pdir == NULL) { 1049 pmap->pm_pdir = (pd_entry_t *)kmem_alloc_nofault(kernel_map, 1050 NBPTD); 1051#ifdef PAE 1052 pmap->pm_pdpt = uma_zalloc(pdptzone, M_WAITOK | M_ZERO); 1053 KASSERT(((vm_offset_t)pmap->pm_pdpt & 1054 ((NPGPTD * sizeof(pdpt_entry_t)) - 1)) == 0, 1055 ("pmap_pinit: pdpt misaligned")); 1056 KASSERT(pmap_kextract((vm_offset_t)pmap->pm_pdpt) < (4ULL<<30), 1057 ("pmap_pinit: pdpt above 4g")); 1058#endif 1059 } 1060 1061 /* 1062 * allocate the page directory page(s) 1063 */ 1064 for (i = 0; i < NPGPTD;) { 1065 m = vm_page_alloc(NULL, color++, 1066 VM_ALLOC_NORMAL | VM_ALLOC_NOOBJ | VM_ALLOC_WIRED | 1067 VM_ALLOC_ZERO); 1068 if (m == NULL) 1069 VM_WAIT; 1070 else { 1071 ptdpg[i++] = m; 1072 } 1073 } 1074 1075 pmap_qenter((vm_offset_t)pmap->pm_pdir, ptdpg, NPGPTD); 1076 1077 for (i = 0; i < NPGPTD; i++) { 1078 if ((ptdpg[i]->flags & PG_ZERO) == 0) 1079 bzero(pmap->pm_pdir + (i * NPDEPG), PAGE_SIZE); 1080 } 1081 1082 mtx_lock_spin(&allpmaps_lock); 1083 LIST_INSERT_HEAD(&allpmaps, pmap, pm_list); 1084 mtx_unlock_spin(&allpmaps_lock); 1085 /* Wire in kernel global address entries. */ 1086 /* XXX copies current process, does not fill in MPPTDI */ 1087 bcopy(PTD + KPTDI, pmap->pm_pdir + KPTDI, nkpt * sizeof(pd_entry_t)); 1088#ifdef SMP 1089 pmap->pm_pdir[MPPTDI] = PTD[MPPTDI]; 1090#endif 1091 1092 /* install self-referential address mapping entry(s) */ 1093 for (i = 0; i < NPGPTD; i++) { 1094 pa = VM_PAGE_TO_PHYS(ptdpg[i]); 1095 pmap->pm_pdir[PTDPTDI + i] = pa | PG_V | PG_RW | PG_A | PG_M; 1096#ifdef PAE 1097 pmap->pm_pdpt[i] = pa | PG_V; 1098#endif 1099 } 1100 1101 pmap->pm_active = 0; 1102 TAILQ_INIT(&pmap->pm_pvlist); 1103 bzero(&pmap->pm_stats, sizeof pmap->pm_stats); 1104} 1105 1106/* 1107 * this routine is called if the page table page is not 1108 * mapped correctly. 1109 */ 1110static vm_page_t 1111_pmap_allocpte(pmap_t pmap, unsigned ptepindex, int flags) 1112{ 1113 vm_paddr_t ptepa; 1114 vm_page_t m; 1115 1116 KASSERT((flags & (M_NOWAIT | M_WAITOK)) == M_NOWAIT || 1117 (flags & (M_NOWAIT | M_WAITOK)) == M_WAITOK, 1118 ("_pmap_allocpte: flags is neither M_NOWAIT nor M_WAITOK")); 1119 1120 /* 1121 * Allocate a page table page. 1122 */ 1123 if ((m = vm_page_alloc(NULL, ptepindex, VM_ALLOC_NOOBJ | 1124 VM_ALLOC_WIRED | VM_ALLOC_ZERO)) == NULL) { 1125 if (flags & M_WAITOK) { 1126 PMAP_UNLOCK(pmap); 1127 vm_page_unlock_queues(); 1128 VM_WAIT; 1129 vm_page_lock_queues(); 1130 PMAP_LOCK(pmap); 1131 } 1132 1133 /* 1134 * Indicate the need to retry. While waiting, the page table 1135 * page may have been allocated. 1136 */ 1137 return (NULL); 1138 } 1139 if ((m->flags & PG_ZERO) == 0) 1140 pmap_zero_page(m); 1141 1142 /* 1143 * Map the pagetable page into the process address space, if 1144 * it isn't already there. 1145 */ 1146 1147 pmap->pm_stats.resident_count++; 1148 1149 ptepa = VM_PAGE_TO_PHYS(m); 1150 pmap->pm_pdir[ptepindex] = 1151 (pd_entry_t) (ptepa | PG_U | PG_RW | PG_V | PG_A | PG_M); 1152 1153 return m; 1154} 1155 1156static vm_page_t 1157pmap_allocpte(pmap_t pmap, vm_offset_t va, int flags) 1158{ 1159 unsigned ptepindex; 1160 pd_entry_t ptepa; 1161 vm_page_t m; 1162 1163 KASSERT((flags & (M_NOWAIT | M_WAITOK)) == M_NOWAIT || 1164 (flags & (M_NOWAIT | M_WAITOK)) == M_WAITOK, 1165 ("pmap_allocpte: flags is neither M_NOWAIT nor M_WAITOK")); 1166 1167 /* 1168 * Calculate pagetable page index 1169 */ 1170 ptepindex = va >> PDRSHIFT; 1171retry: 1172 /* 1173 * Get the page directory entry 1174 */ 1175 ptepa = pmap->pm_pdir[ptepindex]; 1176 1177 /* 1178 * This supports switching from a 4MB page to a 1179 * normal 4K page. 1180 */ 1181 if (ptepa & PG_PS) { 1182 pmap->pm_pdir[ptepindex] = 0; 1183 ptepa = 0; 1184 pmap->pm_stats.resident_count -= NBPDR / PAGE_SIZE; 1185 pmap_invalidate_all(kernel_pmap); 1186 } 1187 1188 /* 1189 * If the page table page is mapped, we just increment the 1190 * hold count, and activate it. 1191 */ 1192 if (ptepa) { 1193 m = PHYS_TO_VM_PAGE(ptepa); 1194 m->wire_count++; 1195 } else { 1196 /* 1197 * Here if the pte page isn't mapped, or if it has 1198 * been deallocated. 1199 */ 1200 m = _pmap_allocpte(pmap, ptepindex, flags); 1201 if (m == NULL && (flags & M_WAITOK)) 1202 goto retry; 1203 } 1204 return (m); 1205} 1206 1207 1208/*************************************************** 1209* Pmap allocation/deallocation routines. 1210 ***************************************************/ 1211 1212#ifdef SMP 1213/* 1214 * Deal with a SMP shootdown of other users of the pmap that we are 1215 * trying to dispose of. This can be a bit hairy. 1216 */ 1217static u_int *lazymask; 1218static u_int lazyptd; 1219static volatile u_int lazywait; 1220 1221void pmap_lazyfix_action(void); 1222 1223void 1224pmap_lazyfix_action(void) 1225{ 1226 u_int mymask = PCPU_GET(cpumask); 1227 1228#ifdef COUNT_IPIS 1229 *ipi_lazypmap_counts[PCPU_GET(cpuid)]++; 1230#endif 1231 if (rcr3() == lazyptd) 1232 load_cr3(PCPU_GET(curpcb)->pcb_cr3); 1233 atomic_clear_int(lazymask, mymask); 1234 atomic_store_rel_int(&lazywait, 1); 1235} 1236 1237static void 1238pmap_lazyfix_self(u_int mymask) 1239{ 1240 1241 if (rcr3() == lazyptd) 1242 load_cr3(PCPU_GET(curpcb)->pcb_cr3); 1243 atomic_clear_int(lazymask, mymask); 1244} 1245 1246 1247static void 1248pmap_lazyfix(pmap_t pmap) 1249{ 1250 u_int mymask; 1251 u_int mask; 1252 register u_int spins; 1253 1254 while ((mask = pmap->pm_active) != 0) { 1255 spins = 50000000; 1256 mask = mask & -mask; /* Find least significant set bit */ 1257 mtx_lock_spin(&smp_ipi_mtx); 1258#ifdef PAE 1259 lazyptd = vtophys(pmap->pm_pdpt); 1260#else 1261 lazyptd = vtophys(pmap->pm_pdir); 1262#endif 1263 mymask = PCPU_GET(cpumask); 1264 if (mask == mymask) { 1265 lazymask = &pmap->pm_active; 1266 pmap_lazyfix_self(mymask); 1267 } else { 1268 atomic_store_rel_int((u_int *)&lazymask, 1269 (u_int)&pmap->pm_active); 1270 atomic_store_rel_int(&lazywait, 0); 1271 ipi_selected(mask, IPI_LAZYPMAP); 1272 while (lazywait == 0) { 1273 ia32_pause(); 1274 if (--spins == 0) 1275 break; 1276 } 1277 } 1278 mtx_unlock_spin(&smp_ipi_mtx); 1279 if (spins == 0) 1280 printf("pmap_lazyfix: spun for 50000000\n"); 1281 } 1282} 1283 1284#else /* SMP */ 1285 1286/* 1287 * Cleaning up on uniprocessor is easy. For various reasons, we're 1288 * unlikely to have to even execute this code, including the fact 1289 * that the cleanup is deferred until the parent does a wait(2), which 1290 * means that another userland process has run. 1291 */ 1292static void 1293pmap_lazyfix(pmap_t pmap) 1294{ 1295 u_int cr3; 1296 1297 cr3 = vtophys(pmap->pm_pdir); 1298 if (cr3 == rcr3()) { 1299 load_cr3(PCPU_GET(curpcb)->pcb_cr3); 1300 pmap->pm_active &= ~(PCPU_GET(cpumask)); 1301 } 1302} 1303#endif /* SMP */ 1304 1305/* 1306 * Release any resources held by the given physical map. 1307 * Called when a pmap initialized by pmap_pinit is being released. 1308 * Should only be called if the map contains no valid mappings. 1309 */ 1310void 1311pmap_release(pmap_t pmap) 1312{ 1313 vm_page_t m, ptdpg[NPGPTD]; 1314 int i; 1315 1316 KASSERT(pmap->pm_stats.resident_count == 0, 1317 ("pmap_release: pmap resident count %ld != 0", 1318 pmap->pm_stats.resident_count)); 1319 1320 pmap_lazyfix(pmap); 1321 mtx_lock_spin(&allpmaps_lock); 1322 LIST_REMOVE(pmap, pm_list); 1323 mtx_unlock_spin(&allpmaps_lock); 1324 1325 for (i = 0; i < NPGPTD; i++) 1326 ptdpg[i] = PHYS_TO_VM_PAGE(pmap->pm_pdir[PTDPTDI + i]); 1327 1328 bzero(pmap->pm_pdir + PTDPTDI, (nkpt + NPGPTD) * 1329 sizeof(*pmap->pm_pdir)); 1330#ifdef SMP 1331 pmap->pm_pdir[MPPTDI] = 0; 1332#endif 1333 1334 pmap_qremove((vm_offset_t)pmap->pm_pdir, NPGPTD); 1335 1336 vm_page_lock_queues(); 1337 for (i = 0; i < NPGPTD; i++) { 1338 m = ptdpg[i]; 1339#ifdef PAE 1340 KASSERT(VM_PAGE_TO_PHYS(m) == (pmap->pm_pdpt[i] & PG_FRAME), 1341 ("pmap_release: got wrong ptd page")); 1342#endif 1343 m->wire_count--; 1344 atomic_subtract_int(&cnt.v_wire_count, 1); 1345 vm_page_free_zero(m); 1346 } 1347 vm_page_unlock_queues(); 1348 PMAP_LOCK_DESTROY(pmap); 1349} 1350 1351static int 1352kvm_size(SYSCTL_HANDLER_ARGS) 1353{ 1354 unsigned long ksize = VM_MAX_KERNEL_ADDRESS - KERNBASE; 1355 1356 return sysctl_handle_long(oidp, &ksize, 0, req); 1357} 1358SYSCTL_PROC(_vm, OID_AUTO, kvm_size, CTLTYPE_LONG|CTLFLAG_RD, 1359 0, 0, kvm_size, "IU", "Size of KVM"); 1360 1361static int 1362kvm_free(SYSCTL_HANDLER_ARGS) 1363{ 1364 unsigned long kfree = VM_MAX_KERNEL_ADDRESS - kernel_vm_end; 1365 1366 return sysctl_handle_long(oidp, &kfree, 0, req); 1367} 1368SYSCTL_PROC(_vm, OID_AUTO, kvm_free, CTLTYPE_LONG|CTLFLAG_RD, 1369 0, 0, kvm_free, "IU", "Amount of KVM free"); 1370 1371/* 1372 * grow the number of kernel page table entries, if needed 1373 */ 1374void 1375pmap_growkernel(vm_offset_t addr) 1376{ 1377 struct pmap *pmap; 1378 vm_paddr_t ptppaddr; 1379 vm_page_t nkpg; 1380 pd_entry_t newpdir; 1381 pt_entry_t *pde; 1382 1383 mtx_assert(&kernel_map->system_mtx, MA_OWNED); 1384 if (kernel_vm_end == 0) { 1385 kernel_vm_end = KERNBASE; 1386 nkpt = 0; 1387 while (pdir_pde(PTD, kernel_vm_end)) { 1388 kernel_vm_end = (kernel_vm_end + PAGE_SIZE * NPTEPG) & ~(PAGE_SIZE * NPTEPG - 1); 1389 nkpt++; 1390 if (kernel_vm_end - 1 >= kernel_map->max_offset) { 1391 kernel_vm_end = kernel_map->max_offset; 1392 break; 1393 } 1394 } 1395 } 1396 addr = roundup2(addr, PAGE_SIZE * NPTEPG); 1397 if (addr - 1 >= kernel_map->max_offset) 1398 addr = kernel_map->max_offset; 1399 while (kernel_vm_end < addr) { 1400 if (pdir_pde(PTD, kernel_vm_end)) { 1401 kernel_vm_end = (kernel_vm_end + PAGE_SIZE * NPTEPG) & ~(PAGE_SIZE * NPTEPG - 1); 1402 if (kernel_vm_end - 1 >= kernel_map->max_offset) { 1403 kernel_vm_end = kernel_map->max_offset; 1404 break; 1405 } 1406 continue; 1407 } 1408 1409 /* 1410 * This index is bogus, but out of the way 1411 */ 1412 nkpg = vm_page_alloc(NULL, nkpt, 1413 VM_ALLOC_NOOBJ | VM_ALLOC_SYSTEM | VM_ALLOC_WIRED); 1414 if (!nkpg) 1415 panic("pmap_growkernel: no memory to grow kernel"); 1416 1417 nkpt++; 1418 1419 pmap_zero_page(nkpg); 1420 ptppaddr = VM_PAGE_TO_PHYS(nkpg); 1421 newpdir = (pd_entry_t) (ptppaddr | PG_V | PG_RW | PG_A | PG_M); 1422 pdir_pde(PTD, kernel_vm_end) = newpdir; 1423 1424 mtx_lock_spin(&allpmaps_lock); 1425 LIST_FOREACH(pmap, &allpmaps, pm_list) { 1426 pde = pmap_pde(pmap, kernel_vm_end); 1427 pde_store(pde, newpdir); 1428 } 1429 mtx_unlock_spin(&allpmaps_lock); 1430 kernel_vm_end = (kernel_vm_end + PAGE_SIZE * NPTEPG) & ~(PAGE_SIZE * NPTEPG - 1); 1431 if (kernel_vm_end - 1 >= kernel_map->max_offset) { 1432 kernel_vm_end = kernel_map->max_offset; 1433 break; 1434 } 1435 } 1436} 1437 1438 1439/*************************************************** 1440 * page management routines. 1441 ***************************************************/ 1442 1443/* 1444 * free the pv_entry back to the free list 1445 */ 1446static PMAP_INLINE void 1447free_pv_entry(pv_entry_t pv) 1448{ 1449 pv_entry_count--; 1450 uma_zfree(pvzone, pv); 1451} 1452 1453/* 1454 * get a new pv_entry, allocating a block from the system 1455 * when needed. 1456 */ 1457static pv_entry_t 1458get_pv_entry(pmap_t locked_pmap) 1459{ 1460 static const struct timeval printinterval = { 60, 0 }; 1461 static struct timeval lastprint; 1462 struct vpgqueues *vpq; 1463 pmap_t pmap; 1464 pt_entry_t *pte, tpte; 1465 pv_entry_t allocated_pv, next_pv, pv; 1466 vm_offset_t va; 1467 vm_page_t m; 1468 1469 PMAP_LOCK_ASSERT(locked_pmap, MA_OWNED); 1470 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 1471 allocated_pv = uma_zalloc(pvzone, M_NOWAIT); 1472 if (allocated_pv != NULL) { 1473 pv_entry_count++; 1474 if (pv_entry_count > pv_entry_high_water) 1475 pagedaemon_wakeup(); 1476 else 1477 return (allocated_pv); 1478 } 1479 1480 /* 1481 * Reclaim pv entries: At first, destroy mappings to inactive 1482 * pages. After that, if a pv entry is still needed, destroy 1483 * mappings to active pages. 1484 */ 1485 if (ratecheck(&lastprint, &printinterval)) 1486 printf("Approaching the limit on PV entries, " 1487 "increase the vm.pmap.shpgperproc tunable.\n"); 1488 vpq = &vm_page_queues[PQ_INACTIVE]; 1489retry: 1490 sched_pin(); 1491 TAILQ_FOREACH(m, &vpq->pl, pageq) { 1492 if (m->hold_count || m->busy || (m->flags & PG_BUSY)) 1493 continue; 1494 TAILQ_FOREACH_SAFE(pv, &m->md.pv_list, pv_list, next_pv) { 1495 va = pv->pv_va; 1496 pmap = pv->pv_pmap; 1497 /* Avoid deadlock and lock recursion. */ 1498 if (pmap > locked_pmap) 1499 PMAP_LOCK(pmap); 1500 else if (pmap != locked_pmap && !PMAP_TRYLOCK(pmap)) 1501 continue; 1502 pmap->pm_stats.resident_count--; 1503 pte = pmap_pte_quick(pmap, va); 1504 tpte = pte_load_clear(pte); 1505 KASSERT((tpte & PG_W) == 0, 1506 ("get_pv_entry: wired pte %#jx", (uintmax_t)tpte)); 1507 if (tpte & PG_A) 1508 vm_page_flag_set(m, PG_REFERENCED); 1509 if (tpte & PG_M) { 1510 KASSERT((tpte & PG_RW), 1511 ("get_pv_entry: modified page not writable: va: %#x, pte: %#jx", 1512 va, (uintmax_t)tpte)); 1513 if (pmap_track_modified(va)) 1514 vm_page_dirty(m); 1515 } 1516 pmap_invalidate_page(pmap, va); 1517 TAILQ_REMOVE(&pmap->pm_pvlist, pv, pv_plist); 1518 TAILQ_REMOVE(&m->md.pv_list, pv, pv_list); 1519 if (TAILQ_EMPTY(&m->md.pv_list)) 1520 vm_page_flag_clear(m, PG_WRITEABLE); 1521 m->md.pv_list_count--; 1522 pmap_unuse_pt(pmap, va); 1523 if (pmap != locked_pmap) 1524 PMAP_UNLOCK(pmap); 1525 if (allocated_pv == NULL) 1526 allocated_pv = pv; 1527 else 1528 free_pv_entry(pv); 1529 } 1530 } 1531 sched_unpin(); 1532 if (allocated_pv == NULL) { 1533 if (vpq == &vm_page_queues[PQ_INACTIVE]) { 1534 vpq = &vm_page_queues[PQ_ACTIVE]; 1535 goto retry; 1536 } 1537 panic("get_pv_entry: increase the vm.pmap.shpgperproc tunable"); 1538 } 1539 return (allocated_pv); 1540} 1541 1542static void 1543pmap_remove_entry(pmap_t pmap, vm_page_t m, vm_offset_t va) 1544{ 1545 pv_entry_t pv; 1546 1547 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 1548 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 1549 if (m->md.pv_list_count < pmap->pm_stats.resident_count) { 1550 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 1551 if (pmap == pv->pv_pmap && va == pv->pv_va) 1552 break; 1553 } 1554 } else { 1555 TAILQ_FOREACH(pv, &pmap->pm_pvlist, pv_plist) { 1556 if (va == pv->pv_va) 1557 break; 1558 } 1559 } 1560 KASSERT(pv != NULL, ("pmap_remove_entry: pv not found")); 1561 TAILQ_REMOVE(&m->md.pv_list, pv, pv_list); 1562 m->md.pv_list_count--; 1563 if (TAILQ_EMPTY(&m->md.pv_list)) 1564 vm_page_flag_clear(m, PG_WRITEABLE); 1565 TAILQ_REMOVE(&pmap->pm_pvlist, pv, pv_plist); 1566 free_pv_entry(pv); 1567} 1568 1569/* 1570 * Create a pv entry for page at pa for 1571 * (pmap, va). 1572 */ 1573static void 1574pmap_insert_entry(pmap_t pmap, vm_offset_t va, vm_page_t m) 1575{ 1576 pv_entry_t pv; 1577 1578 pv = get_pv_entry(pmap); 1579 pv->pv_va = va; 1580 pv->pv_pmap = pmap; 1581 1582 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 1583 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 1584 TAILQ_INSERT_TAIL(&pmap->pm_pvlist, pv, pv_plist); 1585 TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list); 1586 m->md.pv_list_count++; 1587} 1588 1589/* 1590 * pmap_remove_pte: do the things to unmap a page in a process 1591 */ 1592static int 1593pmap_remove_pte(pmap_t pmap, pt_entry_t *ptq, vm_offset_t va) 1594{ 1595 pt_entry_t oldpte; 1596 vm_page_t m; 1597 1598 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 1599 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 1600 oldpte = pte_load_clear(ptq); 1601 if (oldpte & PG_W) 1602 pmap->pm_stats.wired_count -= 1; 1603 /* 1604 * Machines that don't support invlpg, also don't support 1605 * PG_G. 1606 */ 1607 if (oldpte & PG_G) 1608 pmap_invalidate_page(kernel_pmap, va); 1609 pmap->pm_stats.resident_count -= 1; 1610 if (oldpte & PG_MANAGED) { 1611 m = PHYS_TO_VM_PAGE(oldpte); 1612 if (oldpte & PG_M) { 1613 KASSERT((oldpte & PG_RW), 1614 ("pmap_remove_pte: modified page not writable: va: %#x, pte: %#jx", 1615 va, (uintmax_t)oldpte)); 1616 if (pmap_track_modified(va)) 1617 vm_page_dirty(m); 1618 } 1619 if (oldpte & PG_A) 1620 vm_page_flag_set(m, PG_REFERENCED); 1621 pmap_remove_entry(pmap, m, va); 1622 } 1623 return (pmap_unuse_pt(pmap, va)); 1624} 1625 1626/* 1627 * Remove a single page from a process address space 1628 */ 1629static void 1630pmap_remove_page(pmap_t pmap, vm_offset_t va) 1631{ 1632 pt_entry_t *pte; 1633 1634 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 1635 KASSERT(curthread->td_pinned > 0, ("curthread not pinned")); 1636 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 1637 if ((pte = pmap_pte_quick(pmap, va)) == NULL || *pte == 0) 1638 return; 1639 pmap_remove_pte(pmap, pte, va); 1640 pmap_invalidate_page(pmap, va); 1641} 1642 1643/* 1644 * Remove the given range of addresses from the specified map. 1645 * 1646 * It is assumed that the start and end are properly 1647 * rounded to the page size. 1648 */ 1649void 1650pmap_remove(pmap_t pmap, vm_offset_t sva, vm_offset_t eva) 1651{ 1652 vm_offset_t pdnxt; 1653 pd_entry_t ptpaddr; 1654 pt_entry_t *pte; 1655 int anyvalid; 1656 1657 /* 1658 * Perform an unsynchronized read. This is, however, safe. 1659 */ 1660 if (pmap->pm_stats.resident_count == 0) 1661 return; 1662 1663 anyvalid = 0; 1664 1665 vm_page_lock_queues(); 1666 sched_pin(); 1667 PMAP_LOCK(pmap); 1668 1669 /* 1670 * special handling of removing one page. a very 1671 * common operation and easy to short circuit some 1672 * code. 1673 */ 1674 if ((sva + PAGE_SIZE == eva) && 1675 ((pmap->pm_pdir[(sva >> PDRSHIFT)] & PG_PS) == 0)) { 1676 pmap_remove_page(pmap, sva); 1677 goto out; 1678 } 1679 1680 for (; sva < eva; sva = pdnxt) { 1681 unsigned pdirindex; 1682 1683 /* 1684 * Calculate index for next page table. 1685 */ 1686 pdnxt = (sva + NBPDR) & ~PDRMASK; 1687 if (pmap->pm_stats.resident_count == 0) 1688 break; 1689 1690 pdirindex = sva >> PDRSHIFT; 1691 ptpaddr = pmap->pm_pdir[pdirindex]; 1692 1693 /* 1694 * Weed out invalid mappings. Note: we assume that the page 1695 * directory table is always allocated, and in kernel virtual. 1696 */ 1697 if (ptpaddr == 0) 1698 continue; 1699 1700 /* 1701 * Check for large page. 1702 */ 1703 if ((ptpaddr & PG_PS) != 0) { 1704 pmap->pm_pdir[pdirindex] = 0; 1705 pmap->pm_stats.resident_count -= NBPDR / PAGE_SIZE; 1706 anyvalid = 1; 1707 continue; 1708 } 1709 1710 /* 1711 * Limit our scan to either the end of the va represented 1712 * by the current page table page, or to the end of the 1713 * range being removed. 1714 */ 1715 if (pdnxt > eva) 1716 pdnxt = eva; 1717 1718 for (pte = pmap_pte_quick(pmap, sva); sva != pdnxt; pte++, 1719 sva += PAGE_SIZE) { 1720 if (*pte == 0) 1721 continue; 1722 anyvalid = 1; 1723 if (pmap_remove_pte(pmap, pte, sva)) 1724 break; 1725 } 1726 } 1727out: 1728 sched_unpin(); 1729 vm_page_unlock_queues(); 1730 if (anyvalid) 1731 pmap_invalidate_all(pmap); 1732 PMAP_UNLOCK(pmap); 1733} 1734 1735/* 1736 * Routine: pmap_remove_all 1737 * Function: 1738 * Removes this physical page from 1739 * all physical maps in which it resides. 1740 * Reflects back modify bits to the pager. 1741 * 1742 * Notes: 1743 * Original versions of this routine were very 1744 * inefficient because they iteratively called 1745 * pmap_remove (slow...) 1746 */ 1747 1748void 1749pmap_remove_all(vm_page_t m) 1750{ 1751 register pv_entry_t pv; 1752 pt_entry_t *pte, tpte; 1753 1754#if defined(PMAP_DIAGNOSTIC) 1755 /* 1756 * XXX This makes pmap_remove_all() illegal for non-managed pages! 1757 */ 1758 if (m->flags & PG_FICTITIOUS) { 1759 panic("pmap_remove_all: illegal for unmanaged page, va: 0x%x", 1760 VM_PAGE_TO_PHYS(m)); 1761 } 1762#endif 1763 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 1764 sched_pin(); 1765 while ((pv = TAILQ_FIRST(&m->md.pv_list)) != NULL) { 1766 PMAP_LOCK(pv->pv_pmap); 1767 pv->pv_pmap->pm_stats.resident_count--; 1768 pte = pmap_pte_quick(pv->pv_pmap, pv->pv_va); 1769 tpte = pte_load_clear(pte); 1770 if (tpte & PG_W) 1771 pv->pv_pmap->pm_stats.wired_count--; 1772 if (tpte & PG_A) 1773 vm_page_flag_set(m, PG_REFERENCED); 1774 1775 /* 1776 * Update the vm_page_t clean and reference bits. 1777 */ 1778 if (tpte & PG_M) { 1779 KASSERT((tpte & PG_RW), 1780 ("pmap_remove_all: modified page not writable: va: %#x, pte: %#jx", 1781 pv->pv_va, (uintmax_t)tpte)); 1782 if (pmap_track_modified(pv->pv_va)) 1783 vm_page_dirty(m); 1784 } 1785 pmap_invalidate_page(pv->pv_pmap, pv->pv_va); 1786 TAILQ_REMOVE(&pv->pv_pmap->pm_pvlist, pv, pv_plist); 1787 TAILQ_REMOVE(&m->md.pv_list, pv, pv_list); 1788 m->md.pv_list_count--; 1789 pmap_unuse_pt(pv->pv_pmap, pv->pv_va); 1790 PMAP_UNLOCK(pv->pv_pmap); 1791 free_pv_entry(pv); 1792 } 1793 vm_page_flag_clear(m, PG_WRITEABLE); 1794 sched_unpin(); 1795} 1796 1797/* 1798 * Set the physical protection on the 1799 * specified range of this map as requested. 1800 */ 1801void 1802pmap_protect(pmap_t pmap, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot) 1803{ 1804 vm_offset_t pdnxt; 1805 pd_entry_t ptpaddr; 1806 pt_entry_t *pte; 1807 int anychanged; 1808 1809 if ((prot & VM_PROT_READ) == VM_PROT_NONE) { 1810 pmap_remove(pmap, sva, eva); 1811 return; 1812 } 1813 1814 if (prot & VM_PROT_WRITE) 1815 return; 1816 1817 anychanged = 0; 1818 1819 vm_page_lock_queues(); 1820 sched_pin(); 1821 PMAP_LOCK(pmap); 1822 for (; sva < eva; sva = pdnxt) { 1823 unsigned obits, pbits, pdirindex; 1824 1825 pdnxt = (sva + NBPDR) & ~PDRMASK; 1826 1827 pdirindex = sva >> PDRSHIFT; 1828 ptpaddr = pmap->pm_pdir[pdirindex]; 1829 1830 /* 1831 * Weed out invalid mappings. Note: we assume that the page 1832 * directory table is always allocated, and in kernel virtual. 1833 */ 1834 if (ptpaddr == 0) 1835 continue; 1836 1837 /* 1838 * Check for large page. 1839 */ 1840 if ((ptpaddr & PG_PS) != 0) { 1841 pmap->pm_pdir[pdirindex] &= ~(PG_M|PG_RW); 1842 anychanged = 1; 1843 continue; 1844 } 1845 1846 if (pdnxt > eva) 1847 pdnxt = eva; 1848 1849 for (pte = pmap_pte_quick(pmap, sva); sva != pdnxt; pte++, 1850 sva += PAGE_SIZE) { 1851 vm_page_t m; 1852 1853retry: 1854 /* 1855 * Regardless of whether a pte is 32 or 64 bits in 1856 * size, PG_RW, PG_A, and PG_M are among the least 1857 * significant 32 bits. 1858 */ 1859 obits = pbits = *(u_int *)pte; 1860 if (pbits & PG_MANAGED) { 1861 m = NULL; 1862 if (pbits & PG_A) { 1863 m = PHYS_TO_VM_PAGE(*pte); 1864 vm_page_flag_set(m, PG_REFERENCED); 1865 pbits &= ~PG_A; 1866 } 1867 if ((pbits & PG_M) != 0 && 1868 pmap_track_modified(sva)) { 1869 if (m == NULL) 1870 m = PHYS_TO_VM_PAGE(*pte); 1871 vm_page_dirty(m); 1872 } 1873 } 1874 1875 pbits &= ~(PG_RW | PG_M); 1876 1877 if (pbits != obits) { 1878 if (!atomic_cmpset_int((u_int *)pte, obits, 1879 pbits)) 1880 goto retry; 1881 if (obits & PG_G) 1882 pmap_invalidate_page(pmap, sva); 1883 else 1884 anychanged = 1; 1885 } 1886 } 1887 } 1888 sched_unpin(); 1889 vm_page_unlock_queues(); 1890 if (anychanged) 1891 pmap_invalidate_all(pmap); 1892 PMAP_UNLOCK(pmap); 1893} 1894 1895/* 1896 * Insert the given physical page (p) at 1897 * the specified virtual address (v) in the 1898 * target physical map with the protection requested. 1899 * 1900 * If specified, the page will be wired down, meaning 1901 * that the related pte can not be reclaimed. 1902 * 1903 * NB: This is the only routine which MAY NOT lazy-evaluate 1904 * or lose information. That is, this routine must actually 1905 * insert this page into the given map NOW. 1906 */ 1907void 1908pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot, 1909 boolean_t wired) 1910{ 1911 vm_paddr_t pa; 1912 register pt_entry_t *pte; 1913 vm_paddr_t opa; 1914 pt_entry_t origpte, newpte; 1915 vm_page_t mpte, om; 1916 boolean_t invlva; 1917 1918 va &= PG_FRAME; 1919#ifdef PMAP_DIAGNOSTIC 1920 if (va > VM_MAX_KERNEL_ADDRESS) 1921 panic("pmap_enter: toobig"); 1922 if ((va >= UPT_MIN_ADDRESS) && (va < UPT_MAX_ADDRESS)) 1923 panic("pmap_enter: invalid to pmap_enter page table pages (va: 0x%x)", va); 1924#endif 1925 1926 mpte = NULL; 1927 1928 vm_page_lock_queues(); 1929 PMAP_LOCK(pmap); 1930 sched_pin(); 1931 1932 /* 1933 * In the case that a page table page is not 1934 * resident, we are creating it here. 1935 */ 1936 if (va < VM_MAXUSER_ADDRESS) { 1937 mpte = pmap_allocpte(pmap, va, M_WAITOK); 1938 } 1939#if 0 && defined(PMAP_DIAGNOSTIC) 1940 else { 1941 pd_entry_t *pdeaddr = pmap_pde(pmap, va); 1942 origpte = *pdeaddr; 1943 if ((origpte & PG_V) == 0) { 1944 panic("pmap_enter: invalid kernel page table page, pdir=%p, pde=%p, va=%p\n", 1945 pmap->pm_pdir[PTDPTDI], origpte, va); 1946 } 1947 } 1948#endif 1949 1950 pte = pmap_pte_quick(pmap, va); 1951 1952 /* 1953 * Page Directory table entry not valid, we need a new PT page 1954 */ 1955 if (pte == NULL) { 1956 panic("pmap_enter: invalid page directory pdir=%#jx, va=%#x\n", 1957 (uintmax_t)pmap->pm_pdir[PTDPTDI], va); 1958 } 1959 1960 pa = VM_PAGE_TO_PHYS(m); 1961 om = NULL; 1962 origpte = *pte; 1963 opa = origpte & PG_FRAME; 1964 1965 if (origpte & PG_PS) { 1966 /* 1967 * Yes, I know this will truncate upper address bits for PAE, 1968 * but I'm actually more interested in the lower bits 1969 */ 1970 printf("pmap_enter: va %p, pte %p, origpte %p\n", 1971 (void *)va, (void *)pte, (void *)(uintptr_t)origpte); 1972 panic("pmap_enter: attempted pmap_enter on 4MB page"); 1973 } 1974 1975 /* 1976 * Mapping has not changed, must be protection or wiring change. 1977 */ 1978 if (origpte && (opa == pa)) { 1979 /* 1980 * Wiring change, just update stats. We don't worry about 1981 * wiring PT pages as they remain resident as long as there 1982 * are valid mappings in them. Hence, if a user page is wired, 1983 * the PT page will be also. 1984 */ 1985 if (wired && ((origpte & PG_W) == 0)) 1986 pmap->pm_stats.wired_count++; 1987 else if (!wired && (origpte & PG_W)) 1988 pmap->pm_stats.wired_count--; 1989 1990 /* 1991 * Remove extra pte reference 1992 */ 1993 if (mpte) 1994 mpte->wire_count--; 1995 1996 /* 1997 * We might be turning off write access to the page, 1998 * so we go ahead and sense modify status. 1999 */ 2000 if (origpte & PG_MANAGED) { 2001 om = m; 2002 pa |= PG_MANAGED; 2003 } 2004 goto validate; 2005 } 2006 /* 2007 * Mapping has changed, invalidate old range and fall through to 2008 * handle validating new mapping. 2009 */ 2010 if (opa) { 2011 if (origpte & PG_W) 2012 pmap->pm_stats.wired_count--; 2013 if (origpte & PG_MANAGED) { 2014 om = PHYS_TO_VM_PAGE(opa); 2015 pmap_remove_entry(pmap, om, va); 2016 } 2017 if (mpte != NULL) { 2018 mpte->wire_count--; 2019 KASSERT(mpte->wire_count > 0, 2020 ("pmap_enter: missing reference to page table page," 2021 " va: 0x%x", va)); 2022 } 2023 } else 2024 pmap->pm_stats.resident_count++; 2025 2026 /* 2027 * Enter on the PV list if part of our managed memory. 2028 */ 2029 if ((m->flags & (PG_FICTITIOUS | PG_UNMANAGED)) == 0) { 2030 pmap_insert_entry(pmap, va, m); 2031 pa |= PG_MANAGED; 2032 } 2033 2034 /* 2035 * Increment counters 2036 */ 2037 if (wired) 2038 pmap->pm_stats.wired_count++; 2039 2040validate: 2041 /* 2042 * Now validate mapping with desired protection/wiring. 2043 */ 2044 newpte = (pt_entry_t)(pa | PG_V); 2045 if ((prot & VM_PROT_WRITE) != 0) 2046 newpte |= PG_RW; 2047 if (wired) 2048 newpte |= PG_W; 2049 if (va < VM_MAXUSER_ADDRESS) 2050 newpte |= PG_U; 2051 if (pmap == kernel_pmap) 2052 newpte |= pgeflag; 2053 2054 /* 2055 * if the mapping or permission bits are different, we need 2056 * to update the pte. 2057 */ 2058 if ((origpte & ~(PG_M|PG_A)) != newpte) { 2059 if (origpte & PG_V) { 2060 invlva = FALSE; 2061 origpte = pte_load_store(pte, newpte | PG_A); 2062 if (origpte & PG_A) { 2063 if (origpte & PG_MANAGED) 2064 vm_page_flag_set(om, PG_REFERENCED); 2065 if (opa != VM_PAGE_TO_PHYS(m)) 2066 invlva = TRUE; 2067 } 2068 if (origpte & PG_M) { 2069 KASSERT((origpte & PG_RW), 2070 ("pmap_enter: modified page not writable: va: %#x, pte: %#jx", 2071 va, (uintmax_t)origpte)); 2072 if ((origpte & PG_MANAGED) && 2073 pmap_track_modified(va)) 2074 vm_page_dirty(om); 2075 if ((prot & VM_PROT_WRITE) == 0) 2076 invlva = TRUE; 2077 } 2078 if (invlva) 2079 pmap_invalidate_page(pmap, va); 2080 } else 2081 pte_store(pte, newpte | PG_A); 2082 } 2083 sched_unpin(); 2084 vm_page_unlock_queues(); 2085 PMAP_UNLOCK(pmap); 2086} 2087 2088/* 2089 * this code makes some *MAJOR* assumptions: 2090 * 1. Current pmap & pmap exists. 2091 * 2. Not wired. 2092 * 3. Read access. 2093 * 4. No page table pages. 2094 * but is *MUCH* faster than pmap_enter... 2095 */ 2096 2097vm_page_t 2098pmap_enter_quick(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot, 2099 vm_page_t mpte) 2100{ 2101 pt_entry_t *pte; 2102 vm_paddr_t pa; 2103 2104 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 2105 VM_OBJECT_LOCK_ASSERT(m->object, MA_OWNED); 2106 PMAP_LOCK(pmap); 2107 2108 /* 2109 * In the case that a page table page is not 2110 * resident, we are creating it here. 2111 */ 2112 if (va < VM_MAXUSER_ADDRESS) { 2113 unsigned ptepindex; 2114 pd_entry_t ptepa; 2115 2116 /* 2117 * Calculate pagetable page index 2118 */ 2119 ptepindex = va >> PDRSHIFT; 2120 if (mpte && (mpte->pindex == ptepindex)) { 2121 mpte->wire_count++; 2122 } else { 2123retry: 2124 /* 2125 * Get the page directory entry 2126 */ 2127 ptepa = pmap->pm_pdir[ptepindex]; 2128 2129 /* 2130 * If the page table page is mapped, we just increment 2131 * the hold count, and activate it. 2132 */ 2133 if (ptepa) { 2134 if (ptepa & PG_PS) 2135 panic("pmap_enter_quick: unexpected mapping into 4MB page"); 2136 mpte = PHYS_TO_VM_PAGE(ptepa); 2137 mpte->wire_count++; 2138 } else { 2139 mpte = _pmap_allocpte(pmap, ptepindex, 2140 M_NOWAIT); 2141 if (mpte == NULL) { 2142 PMAP_UNLOCK(pmap); 2143 vm_page_busy(m); 2144 vm_page_unlock_queues(); 2145 VM_OBJECT_UNLOCK(m->object); 2146 VM_WAIT; 2147 VM_OBJECT_LOCK(m->object); 2148 vm_page_lock_queues(); 2149 vm_page_wakeup(m); 2150 PMAP_LOCK(pmap); 2151 goto retry; 2152 } 2153 } 2154 } 2155 } else { 2156 mpte = NULL; 2157 } 2158 2159 /* 2160 * This call to vtopte makes the assumption that we are 2161 * entering the page into the current pmap. In order to support 2162 * quick entry into any pmap, one would likely use pmap_pte_quick. 2163 * But that isn't as quick as vtopte. 2164 */ 2165 pte = vtopte(va); 2166 if (*pte) { 2167 if (mpte != NULL) { 2168 pmap_unwire_pte_hold(pmap, mpte); 2169 mpte = NULL; 2170 } 2171 goto out; 2172 } 2173 2174 /* 2175 * Enter on the PV list if part of our managed memory. Note that we 2176 * raise IPL while manipulating pv_table since pmap_enter can be 2177 * called at interrupt time. 2178 */ 2179 if ((m->flags & (PG_FICTITIOUS|PG_UNMANAGED)) == 0) 2180 pmap_insert_entry(pmap, va, m); 2181 2182 /* 2183 * Increment counters 2184 */ 2185 pmap->pm_stats.resident_count++; 2186 2187 pa = VM_PAGE_TO_PHYS(m); 2188 2189 /* 2190 * Now validate mapping with RO protection 2191 */ 2192 if (m->flags & (PG_FICTITIOUS|PG_UNMANAGED)) 2193 pte_store(pte, pa | PG_V | PG_U); 2194 else 2195 pte_store(pte, pa | PG_V | PG_U | PG_MANAGED); 2196out: 2197 PMAP_UNLOCK(pmap); 2198 return mpte; 2199} 2200 2201/* 2202 * Make a temporary mapping for a physical address. This is only intended 2203 * to be used for panic dumps. 2204 */ 2205void * 2206pmap_kenter_temporary(vm_paddr_t pa, int i) 2207{ 2208 vm_offset_t va; 2209 2210 va = (vm_offset_t)crashdumpmap + (i * PAGE_SIZE); 2211 pmap_kenter(va, pa); 2212 invlpg(va); 2213 return ((void *)crashdumpmap); 2214} 2215 2216/* 2217 * This code maps large physical mmap regions into the 2218 * processor address space. Note that some shortcuts 2219 * are taken, but the code works. 2220 */ 2221void 2222pmap_object_init_pt(pmap_t pmap, vm_offset_t addr, 2223 vm_object_t object, vm_pindex_t pindex, 2224 vm_size_t size) 2225{ 2226 vm_page_t p; 2227 2228 VM_OBJECT_LOCK_ASSERT(object, MA_OWNED); 2229 KASSERT(object->type == OBJT_DEVICE, 2230 ("pmap_object_init_pt: non-device object")); 2231 if (pseflag && 2232 ((addr & (NBPDR - 1)) == 0) && ((size & (NBPDR - 1)) == 0)) { 2233 int i; 2234 vm_page_t m[1]; 2235 unsigned int ptepindex; 2236 int npdes; 2237 pd_entry_t ptepa; 2238 2239 PMAP_LOCK(pmap); 2240 if (pmap->pm_pdir[ptepindex = (addr >> PDRSHIFT)]) 2241 goto out; 2242 PMAP_UNLOCK(pmap); 2243retry: 2244 p = vm_page_lookup(object, pindex); 2245 if (p != NULL) { 2246 vm_page_lock_queues(); 2247 if (vm_page_sleep_if_busy(p, FALSE, "init4p")) 2248 goto retry; 2249 } else { 2250 p = vm_page_alloc(object, pindex, VM_ALLOC_NORMAL); 2251 if (p == NULL) 2252 return; 2253 m[0] = p; 2254 2255 if (vm_pager_get_pages(object, m, 1, 0) != VM_PAGER_OK) { 2256 vm_page_lock_queues(); 2257 vm_page_free(p); 2258 vm_page_unlock_queues(); 2259 return; 2260 } 2261 2262 p = vm_page_lookup(object, pindex); 2263 vm_page_lock_queues(); 2264 vm_page_wakeup(p); 2265 } 2266 vm_page_unlock_queues(); 2267 2268 ptepa = VM_PAGE_TO_PHYS(p); 2269 if (ptepa & (NBPDR - 1)) 2270 return; 2271 2272 p->valid = VM_PAGE_BITS_ALL; 2273 2274 PMAP_LOCK(pmap); 2275 pmap->pm_stats.resident_count += size >> PAGE_SHIFT; 2276 npdes = size >> PDRSHIFT; 2277 for(i = 0; i < npdes; i++) { 2278 pde_store(&pmap->pm_pdir[ptepindex], 2279 ptepa | PG_U | PG_RW | PG_V | PG_PS); 2280 ptepa += NBPDR; 2281 ptepindex += 1; 2282 } 2283 pmap_invalidate_all(pmap); 2284out: 2285 PMAP_UNLOCK(pmap); 2286 } 2287} 2288 2289/* 2290 * Routine: pmap_change_wiring 2291 * Function: Change the wiring attribute for a map/virtual-address 2292 * pair. 2293 * In/out conditions: 2294 * The mapping must already exist in the pmap. 2295 */ 2296void 2297pmap_change_wiring(pmap, va, wired) 2298 register pmap_t pmap; 2299 vm_offset_t va; 2300 boolean_t wired; 2301{ 2302 register pt_entry_t *pte; 2303 2304 PMAP_LOCK(pmap); 2305 pte = pmap_pte(pmap, va); 2306 2307 if (wired && !pmap_pte_w(pte)) 2308 pmap->pm_stats.wired_count++; 2309 else if (!wired && pmap_pte_w(pte)) 2310 pmap->pm_stats.wired_count--; 2311 2312 /* 2313 * Wiring is not a hardware characteristic so there is no need to 2314 * invalidate TLB. 2315 */ 2316 pmap_pte_set_w(pte, wired); 2317 pmap_pte_release(pte); 2318 PMAP_UNLOCK(pmap); 2319} 2320 2321 2322 2323/* 2324 * Copy the range specified by src_addr/len 2325 * from the source map to the range dst_addr/len 2326 * in the destination map. 2327 * 2328 * This routine is only advisory and need not do anything. 2329 */ 2330 2331void 2332pmap_copy(pmap_t dst_pmap, pmap_t src_pmap, vm_offset_t dst_addr, vm_size_t len, 2333 vm_offset_t src_addr) 2334{ 2335 vm_offset_t addr; 2336 vm_offset_t end_addr = src_addr + len; 2337 vm_offset_t pdnxt; 2338 vm_page_t m; 2339 2340 if (dst_addr != src_addr) 2341 return; 2342 2343 if (!pmap_is_current(src_pmap)) 2344 return; 2345 2346 vm_page_lock_queues(); 2347 if (dst_pmap < src_pmap) { 2348 PMAP_LOCK(dst_pmap); 2349 PMAP_LOCK(src_pmap); 2350 } else { 2351 PMAP_LOCK(src_pmap); 2352 PMAP_LOCK(dst_pmap); 2353 } 2354 sched_pin(); 2355 for (addr = src_addr; addr < end_addr; addr = pdnxt) { 2356 pt_entry_t *src_pte, *dst_pte; 2357 vm_page_t dstmpte, srcmpte; 2358 pd_entry_t srcptepaddr; 2359 unsigned ptepindex; 2360 2361 if (addr >= UPT_MIN_ADDRESS) 2362 panic("pmap_copy: invalid to pmap_copy page tables"); 2363 2364 /* 2365 * Don't let optional prefaulting of pages make us go 2366 * way below the low water mark of free pages or way 2367 * above high water mark of used pv entries. 2368 */ 2369 if (cnt.v_free_count < cnt.v_free_reserved || 2370 pv_entry_count > pv_entry_high_water) 2371 break; 2372 2373 pdnxt = (addr + NBPDR) & ~PDRMASK; 2374 ptepindex = addr >> PDRSHIFT; 2375 2376 srcptepaddr = src_pmap->pm_pdir[ptepindex]; 2377 if (srcptepaddr == 0) 2378 continue; 2379 2380 if (srcptepaddr & PG_PS) { 2381 if (dst_pmap->pm_pdir[ptepindex] == 0) { 2382 dst_pmap->pm_pdir[ptepindex] = srcptepaddr; 2383 dst_pmap->pm_stats.resident_count += 2384 NBPDR / PAGE_SIZE; 2385 } 2386 continue; 2387 } 2388 2389 srcmpte = PHYS_TO_VM_PAGE(srcptepaddr); 2390 if (srcmpte->wire_count == 0) 2391 panic("pmap_copy: source page table page is unused"); 2392 2393 if (pdnxt > end_addr) 2394 pdnxt = end_addr; 2395 2396 src_pte = vtopte(addr); 2397 while (addr < pdnxt) { 2398 pt_entry_t ptetemp; 2399 ptetemp = *src_pte; 2400 /* 2401 * we only virtual copy managed pages 2402 */ 2403 if ((ptetemp & PG_MANAGED) != 0) { 2404 /* 2405 * We have to check after allocpte for the 2406 * pte still being around... allocpte can 2407 * block. 2408 */ 2409 dstmpte = pmap_allocpte(dst_pmap, addr, 2410 M_NOWAIT); 2411 if (dstmpte == NULL) 2412 break; 2413 dst_pte = pmap_pte_quick(dst_pmap, addr); 2414 if (*dst_pte == 0) { 2415 /* 2416 * Clear the modified and 2417 * accessed (referenced) bits 2418 * during the copy. 2419 */ 2420 m = PHYS_TO_VM_PAGE(ptetemp); 2421 *dst_pte = ptetemp & ~(PG_M | PG_A); 2422 dst_pmap->pm_stats.resident_count++; 2423 pmap_insert_entry(dst_pmap, addr, m); 2424 } else 2425 pmap_unwire_pte_hold(dst_pmap, dstmpte); 2426 if (dstmpte->wire_count >= srcmpte->wire_count) 2427 break; 2428 } 2429 addr += PAGE_SIZE; 2430 src_pte++; 2431 } 2432 } 2433 sched_unpin(); 2434 vm_page_unlock_queues(); 2435 PMAP_UNLOCK(src_pmap); 2436 PMAP_UNLOCK(dst_pmap); 2437} 2438 2439static __inline void 2440pagezero(void *page) 2441{ 2442#if defined(I686_CPU) 2443 if (cpu_class == CPUCLASS_686) { 2444#if defined(CPU_ENABLE_SSE) 2445 if (cpu_feature & CPUID_SSE2) 2446 sse2_pagezero(page); 2447 else 2448#endif 2449 i686_pagezero(page); 2450 } else 2451#endif 2452 bzero(page, PAGE_SIZE); 2453} 2454 2455/* 2456 * pmap_zero_page zeros the specified hardware page by mapping 2457 * the page into KVM and using bzero to clear its contents. 2458 */ 2459void 2460pmap_zero_page(vm_page_t m) 2461{ 2462 struct sysmaps *sysmaps; 2463 2464 sysmaps = &sysmaps_pcpu[PCPU_GET(cpuid)]; 2465 mtx_lock(&sysmaps->lock); 2466 if (*sysmaps->CMAP2) 2467 panic("pmap_zero_page: CMAP2 busy"); 2468 sched_pin(); 2469 *sysmaps->CMAP2 = PG_V | PG_RW | VM_PAGE_TO_PHYS(m) | PG_A | PG_M; 2470 invlcaddr(sysmaps->CADDR2); 2471 pagezero(sysmaps->CADDR2); 2472 *sysmaps->CMAP2 = 0; 2473 sched_unpin(); 2474 mtx_unlock(&sysmaps->lock); 2475} 2476 2477/* 2478 * pmap_zero_page_area zeros the specified hardware page by mapping 2479 * the page into KVM and using bzero to clear its contents. 2480 * 2481 * off and size may not cover an area beyond a single hardware page. 2482 */ 2483void 2484pmap_zero_page_area(vm_page_t m, int off, int size) 2485{ 2486 struct sysmaps *sysmaps; 2487 2488 sysmaps = &sysmaps_pcpu[PCPU_GET(cpuid)]; 2489 mtx_lock(&sysmaps->lock); 2490 if (*sysmaps->CMAP2) 2491 panic("pmap_zero_page: CMAP2 busy"); 2492 sched_pin(); 2493 *sysmaps->CMAP2 = PG_V | PG_RW | VM_PAGE_TO_PHYS(m) | PG_A | PG_M; 2494 invlcaddr(sysmaps->CADDR2); 2495 if (off == 0 && size == PAGE_SIZE) 2496 pagezero(sysmaps->CADDR2); 2497 else 2498 bzero((char *)sysmaps->CADDR2 + off, size); 2499 *sysmaps->CMAP2 = 0; 2500 sched_unpin(); 2501 mtx_unlock(&sysmaps->lock); 2502} 2503 2504/* 2505 * pmap_zero_page_idle zeros the specified hardware page by mapping 2506 * the page into KVM and using bzero to clear its contents. This 2507 * is intended to be called from the vm_pagezero process only and 2508 * outside of Giant. 2509 */ 2510void 2511pmap_zero_page_idle(vm_page_t m) 2512{ 2513 2514 if (*CMAP3) 2515 panic("pmap_zero_page: CMAP3 busy"); 2516 sched_pin(); 2517 *CMAP3 = PG_V | PG_RW | VM_PAGE_TO_PHYS(m) | PG_A | PG_M; 2518 invlcaddr(CADDR3); 2519 pagezero(CADDR3); 2520 *CMAP3 = 0; 2521 sched_unpin(); 2522} 2523 2524/* 2525 * pmap_copy_page copies the specified (machine independent) 2526 * page by mapping the page into virtual memory and using 2527 * bcopy to copy the page, one machine dependent page at a 2528 * time. 2529 */ 2530void 2531pmap_copy_page(vm_page_t src, vm_page_t dst) 2532{ 2533 struct sysmaps *sysmaps; 2534 2535 sysmaps = &sysmaps_pcpu[PCPU_GET(cpuid)]; 2536 mtx_lock(&sysmaps->lock); 2537 if (*sysmaps->CMAP1) 2538 panic("pmap_copy_page: CMAP1 busy"); 2539 if (*sysmaps->CMAP2) 2540 panic("pmap_copy_page: CMAP2 busy"); 2541 sched_pin(); 2542 invlpg((u_int)sysmaps->CADDR1); 2543 invlpg((u_int)sysmaps->CADDR2); 2544 *sysmaps->CMAP1 = PG_V | VM_PAGE_TO_PHYS(src) | PG_A; 2545 *sysmaps->CMAP2 = PG_V | PG_RW | VM_PAGE_TO_PHYS(dst) | PG_A | PG_M; 2546 bcopy(sysmaps->CADDR1, sysmaps->CADDR2, PAGE_SIZE); 2547 *sysmaps->CMAP1 = 0; 2548 *sysmaps->CMAP2 = 0; 2549 sched_unpin(); 2550 mtx_unlock(&sysmaps->lock); 2551} 2552 2553/* 2554 * Returns true if the pmap's pv is one of the first 2555 * 16 pvs linked to from this page. This count may 2556 * be changed upwards or downwards in the future; it 2557 * is only necessary that true be returned for a small 2558 * subset of pmaps for proper page aging. 2559 */ 2560boolean_t 2561pmap_page_exists_quick(pmap, m) 2562 pmap_t pmap; 2563 vm_page_t m; 2564{ 2565 pv_entry_t pv; 2566 int loops = 0; 2567 2568 if (m->flags & PG_FICTITIOUS) 2569 return FALSE; 2570 2571 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 2572 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 2573 if (pv->pv_pmap == pmap) { 2574 return TRUE; 2575 } 2576 loops++; 2577 if (loops >= 16) 2578 break; 2579 } 2580 return (FALSE); 2581} 2582 2583#define PMAP_REMOVE_PAGES_CURPROC_ONLY 2584/* 2585 * Remove all pages from specified address space 2586 * this aids process exit speeds. Also, this code 2587 * is special cased for current process only, but 2588 * can have the more generic (and slightly slower) 2589 * mode enabled. This is much faster than pmap_remove 2590 * in the case of running down an entire address space. 2591 */ 2592void 2593pmap_remove_pages(pmap, sva, eva) 2594 pmap_t pmap; 2595 vm_offset_t sva, eva; 2596{ 2597 pt_entry_t *pte, tpte; 2598 vm_page_t m; 2599 pv_entry_t pv, npv; 2600 2601#ifdef PMAP_REMOVE_PAGES_CURPROC_ONLY 2602 if (pmap != vmspace_pmap(curthread->td_proc->p_vmspace)) { 2603 printf("warning: pmap_remove_pages called with non-current pmap\n"); 2604 return; 2605 } 2606#endif 2607 vm_page_lock_queues(); 2608 PMAP_LOCK(pmap); 2609 sched_pin(); 2610 for (pv = TAILQ_FIRST(&pmap->pm_pvlist); pv; pv = npv) { 2611 2612 if (pv->pv_va >= eva || pv->pv_va < sva) { 2613 npv = TAILQ_NEXT(pv, pv_plist); 2614 continue; 2615 } 2616 2617#ifdef PMAP_REMOVE_PAGES_CURPROC_ONLY 2618 pte = vtopte(pv->pv_va); 2619#else 2620 pte = pmap_pte_quick(pmap, pv->pv_va); 2621#endif 2622 tpte = *pte; 2623 2624 if (tpte == 0) { 2625 printf("TPTE at %p IS ZERO @ VA %08x\n", 2626 pte, pv->pv_va); 2627 panic("bad pte"); 2628 } 2629 2630/* 2631 * We cannot remove wired pages from a process' mapping at this time 2632 */ 2633 if (tpte & PG_W) { 2634 npv = TAILQ_NEXT(pv, pv_plist); 2635 continue; 2636 } 2637 2638 m = PHYS_TO_VM_PAGE(tpte); 2639 KASSERT(m->phys_addr == (tpte & PG_FRAME), 2640 ("vm_page_t %p phys_addr mismatch %016jx %016jx", 2641 m, (uintmax_t)m->phys_addr, (uintmax_t)tpte)); 2642 2643 KASSERT(m < &vm_page_array[vm_page_array_size], 2644 ("pmap_remove_pages: bad tpte %#jx", (uintmax_t)tpte)); 2645 2646 pmap->pm_stats.resident_count--; 2647 2648 pte_clear(pte); 2649 2650 /* 2651 * Update the vm_page_t clean and reference bits. 2652 */ 2653 if (tpte & PG_M) { 2654 vm_page_dirty(m); 2655 } 2656 2657 npv = TAILQ_NEXT(pv, pv_plist); 2658 TAILQ_REMOVE(&pmap->pm_pvlist, pv, pv_plist); 2659 2660 m->md.pv_list_count--; 2661 TAILQ_REMOVE(&m->md.pv_list, pv, pv_list); 2662 if (TAILQ_EMPTY(&m->md.pv_list)) 2663 vm_page_flag_clear(m, PG_WRITEABLE); 2664 2665 pmap_unuse_pt(pmap, pv->pv_va); 2666 free_pv_entry(pv); 2667 } 2668 sched_unpin(); 2669 pmap_invalidate_all(pmap); 2670 PMAP_UNLOCK(pmap); 2671 vm_page_unlock_queues(); 2672} 2673 2674/* 2675 * pmap_is_modified: 2676 * 2677 * Return whether or not the specified physical page was modified 2678 * in any physical maps. 2679 */ 2680boolean_t 2681pmap_is_modified(vm_page_t m) 2682{ 2683 pv_entry_t pv; 2684 pt_entry_t *pte; 2685 boolean_t rv; 2686 2687 rv = FALSE; 2688 if (m->flags & PG_FICTITIOUS) 2689 return (rv); 2690 2691 sched_pin(); 2692 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 2693 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 2694 /* 2695 * if the bit being tested is the modified bit, then 2696 * mark clean_map and ptes as never 2697 * modified. 2698 */ 2699 if (!pmap_track_modified(pv->pv_va)) 2700 continue; 2701 PMAP_LOCK(pv->pv_pmap); 2702 pte = pmap_pte_quick(pv->pv_pmap, pv->pv_va); 2703 rv = (*pte & PG_M) != 0; 2704 PMAP_UNLOCK(pv->pv_pmap); 2705 if (rv) 2706 break; 2707 } 2708 sched_unpin(); 2709 return (rv); 2710} 2711 2712/* 2713 * pmap_is_prefaultable: 2714 * 2715 * Return whether or not the specified virtual address is elgible 2716 * for prefault. 2717 */ 2718boolean_t 2719pmap_is_prefaultable(pmap_t pmap, vm_offset_t addr) 2720{ 2721 pt_entry_t *pte; 2722 boolean_t rv; 2723 2724 rv = FALSE; 2725 PMAP_LOCK(pmap); 2726 if (*pmap_pde(pmap, addr)) { 2727 pte = vtopte(addr); 2728 rv = *pte == 0; 2729 } 2730 PMAP_UNLOCK(pmap); 2731 return (rv); 2732} 2733 2734/* 2735 * Clear the given bit in each of the given page's ptes. The bit is 2736 * expressed as a 32-bit mask. Consequently, if the pte is 64 bits in 2737 * size, only a bit within the least significant 32 can be cleared. 2738 */ 2739static __inline void 2740pmap_clear_ptes(vm_page_t m, int bit) 2741{ 2742 register pv_entry_t pv; 2743 pt_entry_t pbits, *pte; 2744 2745 if ((m->flags & PG_FICTITIOUS) || 2746 (bit == PG_RW && (m->flags & PG_WRITEABLE) == 0)) 2747 return; 2748 2749 sched_pin(); 2750 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 2751 /* 2752 * Loop over all current mappings setting/clearing as appropos If 2753 * setting RO do we need to clear the VAC? 2754 */ 2755 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 2756 /* 2757 * don't write protect pager mappings 2758 */ 2759 if (bit == PG_RW) { 2760 if (!pmap_track_modified(pv->pv_va)) 2761 continue; 2762 } 2763 2764 PMAP_LOCK(pv->pv_pmap); 2765 pte = pmap_pte_quick(pv->pv_pmap, pv->pv_va); 2766retry: 2767 pbits = *pte; 2768 if (pbits & bit) { 2769 if (bit == PG_RW) { 2770 /* 2771 * Regardless of whether a pte is 32 or 64 bits 2772 * in size, PG_RW and PG_M are among the least 2773 * significant 32 bits. 2774 */ 2775 if (!atomic_cmpset_int((u_int *)pte, pbits, 2776 pbits & ~(PG_RW | PG_M))) 2777 goto retry; 2778 if (pbits & PG_M) { 2779 vm_page_dirty(m); 2780 } 2781 } else { 2782 atomic_clear_int((u_int *)pte, bit); 2783 } 2784 pmap_invalidate_page(pv->pv_pmap, pv->pv_va); 2785 } 2786 PMAP_UNLOCK(pv->pv_pmap); 2787 } 2788 if (bit == PG_RW) 2789 vm_page_flag_clear(m, PG_WRITEABLE); 2790 sched_unpin(); 2791} 2792 2793/* 2794 * pmap_page_protect: 2795 * 2796 * Lower the permission for all mappings to a given page. 2797 */ 2798void 2799pmap_page_protect(vm_page_t m, vm_prot_t prot) 2800{ 2801 if ((prot & VM_PROT_WRITE) == 0) { 2802 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { 2803 pmap_clear_ptes(m, PG_RW); 2804 } else { 2805 pmap_remove_all(m); 2806 } 2807 } 2808} 2809 2810/* 2811 * pmap_ts_referenced: 2812 * 2813 * Return a count of reference bits for a page, clearing those bits. 2814 * It is not necessary for every reference bit to be cleared, but it 2815 * is necessary that 0 only be returned when there are truly no 2816 * reference bits set. 2817 * 2818 * XXX: The exact number of bits to check and clear is a matter that 2819 * should be tested and standardized at some point in the future for 2820 * optimal aging of shared pages. 2821 */ 2822int 2823pmap_ts_referenced(vm_page_t m) 2824{ 2825 register pv_entry_t pv, pvf, pvn; 2826 pt_entry_t *pte; 2827 pt_entry_t v; 2828 int rtval = 0; 2829 2830 if (m->flags & PG_FICTITIOUS) 2831 return (rtval); 2832 2833 sched_pin(); 2834 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 2835 if ((pv = TAILQ_FIRST(&m->md.pv_list)) != NULL) { 2836 2837 pvf = pv; 2838 2839 do { 2840 pvn = TAILQ_NEXT(pv, pv_list); 2841 2842 TAILQ_REMOVE(&m->md.pv_list, pv, pv_list); 2843 2844 TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list); 2845 2846 if (!pmap_track_modified(pv->pv_va)) 2847 continue; 2848 2849 PMAP_LOCK(pv->pv_pmap); 2850 pte = pmap_pte_quick(pv->pv_pmap, pv->pv_va); 2851 2852 if (pte && ((v = pte_load(pte)) & PG_A) != 0) { 2853 atomic_clear_int((u_int *)pte, PG_A); 2854 pmap_invalidate_page(pv->pv_pmap, pv->pv_va); 2855 2856 rtval++; 2857 if (rtval > 4) { 2858 PMAP_UNLOCK(pv->pv_pmap); 2859 break; 2860 } 2861 } 2862 PMAP_UNLOCK(pv->pv_pmap); 2863 } while ((pv = pvn) != NULL && pv != pvf); 2864 } 2865 sched_unpin(); 2866 2867 return (rtval); 2868} 2869 2870/* 2871 * Clear the modify bits on the specified physical page. 2872 */ 2873void 2874pmap_clear_modify(vm_page_t m) 2875{ 2876 pmap_clear_ptes(m, PG_M); 2877} 2878 2879/* 2880 * pmap_clear_reference: 2881 * 2882 * Clear the reference bit on the specified physical page. 2883 */ 2884void 2885pmap_clear_reference(vm_page_t m) 2886{ 2887 pmap_clear_ptes(m, PG_A); 2888} 2889 2890/* 2891 * Miscellaneous support routines follow 2892 */ 2893 2894/* 2895 * Map a set of physical memory pages into the kernel virtual 2896 * address space. Return a pointer to where it is mapped. This 2897 * routine is intended to be used for mapping device memory, 2898 * NOT real memory. 2899 */ 2900void * 2901pmap_mapdev(pa, size) 2902 vm_paddr_t pa; 2903 vm_size_t size; 2904{ 2905 vm_offset_t va, tmpva, offset; 2906 2907 offset = pa & PAGE_MASK; 2908 size = roundup(offset + size, PAGE_SIZE); 2909 pa = pa & PG_FRAME; 2910 2911 if (pa < KERNLOAD && pa + size <= KERNLOAD) 2912 va = KERNBASE + pa; 2913 else 2914 va = kmem_alloc_nofault(kernel_map, size); 2915 if (!va) 2916 panic("pmap_mapdev: Couldn't alloc kernel virtual memory"); 2917 2918 for (tmpva = va; size > 0; ) { 2919 pmap_kenter(tmpva, pa); 2920 size -= PAGE_SIZE; 2921 tmpva += PAGE_SIZE; 2922 pa += PAGE_SIZE; 2923 } 2924 pmap_invalidate_range(kernel_pmap, va, tmpva); 2925 return ((void *)(va + offset)); 2926} 2927 2928void 2929pmap_unmapdev(va, size) 2930 vm_offset_t va; 2931 vm_size_t size; 2932{ 2933 vm_offset_t base, offset, tmpva; 2934 2935 if (va >= KERNBASE && va + size <= KERNBASE + KERNLOAD) 2936 return; 2937 base = va & PG_FRAME; 2938 offset = va & PAGE_MASK; 2939 size = roundup(offset + size, PAGE_SIZE); 2940 for (tmpva = base; tmpva < (base + size); tmpva += PAGE_SIZE) 2941 pmap_kremove(tmpva); 2942 pmap_invalidate_range(kernel_pmap, va, tmpva); 2943 kmem_free(kernel_map, base, size); 2944} 2945 2946/* 2947 * perform the pmap work for mincore 2948 */ 2949int 2950pmap_mincore(pmap, addr) 2951 pmap_t pmap; 2952 vm_offset_t addr; 2953{ 2954 pt_entry_t *ptep, pte; 2955 vm_page_t m; 2956 int val = 0; 2957 2958 PMAP_LOCK(pmap); 2959 ptep = pmap_pte(pmap, addr); 2960 pte = (ptep != NULL) ? *ptep : 0; 2961 pmap_pte_release(ptep); 2962 PMAP_UNLOCK(pmap); 2963 2964 if (pte != 0) { 2965 vm_paddr_t pa; 2966 2967 val = MINCORE_INCORE; 2968 if ((pte & PG_MANAGED) == 0) 2969 return val; 2970 2971 pa = pte & PG_FRAME; 2972 2973 m = PHYS_TO_VM_PAGE(pa); 2974 2975 /* 2976 * Modified by us 2977 */ 2978 if (pte & PG_M) 2979 val |= MINCORE_MODIFIED|MINCORE_MODIFIED_OTHER; 2980 else { 2981 /* 2982 * Modified by someone else 2983 */ 2984 vm_page_lock_queues(); 2985 if (m->dirty || pmap_is_modified(m)) 2986 val |= MINCORE_MODIFIED_OTHER; 2987 vm_page_unlock_queues(); 2988 } 2989 /* 2990 * Referenced by us 2991 */ 2992 if (pte & PG_A) 2993 val |= MINCORE_REFERENCED|MINCORE_REFERENCED_OTHER; 2994 else { 2995 /* 2996 * Referenced by someone else 2997 */ 2998 vm_page_lock_queues(); 2999 if ((m->flags & PG_REFERENCED) || 3000 pmap_ts_referenced(m)) { 3001 val |= MINCORE_REFERENCED_OTHER; 3002 vm_page_flag_set(m, PG_REFERENCED); 3003 } 3004 vm_page_unlock_queues(); 3005 } 3006 } 3007 return val; 3008} 3009 3010void 3011pmap_activate(struct thread *td) 3012{ 3013 pmap_t pmap, oldpmap; 3014 u_int32_t cr3; 3015 3016 critical_enter(); 3017 pmap = vmspace_pmap(td->td_proc->p_vmspace); 3018 oldpmap = PCPU_GET(curpmap); 3019#if defined(SMP) 3020 atomic_clear_int(&oldpmap->pm_active, PCPU_GET(cpumask)); 3021 atomic_set_int(&pmap->pm_active, PCPU_GET(cpumask)); 3022#else 3023 oldpmap->pm_active &= ~1; 3024 pmap->pm_active |= 1; 3025#endif 3026#ifdef PAE 3027 cr3 = vtophys(pmap->pm_pdpt); 3028#else 3029 cr3 = vtophys(pmap->pm_pdir); 3030#endif 3031 /* 3032 * pmap_activate is for the current thread on the current cpu 3033 */ 3034 td->td_pcb->pcb_cr3 = cr3; 3035 load_cr3(cr3); 3036 PCPU_SET(curpmap, pmap); 3037 critical_exit(); 3038} 3039 3040vm_offset_t 3041pmap_addr_hint(vm_object_t obj, vm_offset_t addr, vm_size_t size) 3042{ 3043 3044 if ((obj == NULL) || (size < NBPDR) || (obj->type != OBJT_DEVICE)) { 3045 return addr; 3046 } 3047 3048 addr = (addr + PDRMASK) & ~PDRMASK; 3049 return addr; 3050} 3051 3052 3053#if defined(PMAP_DEBUG) 3054pmap_pid_dump(int pid) 3055{ 3056 pmap_t pmap; 3057 struct proc *p; 3058 int npte = 0; 3059 int index; 3060 3061 sx_slock(&allproc_lock); 3062 LIST_FOREACH(p, &allproc, p_list) { 3063 if (p->p_pid != pid) 3064 continue; 3065 3066 if (p->p_vmspace) { 3067 int i,j; 3068 index = 0; 3069 pmap = vmspace_pmap(p->p_vmspace); 3070 for (i = 0; i < NPDEPTD; i++) { 3071 pd_entry_t *pde; 3072 pt_entry_t *pte; 3073 vm_offset_t base = i << PDRSHIFT; 3074 3075 pde = &pmap->pm_pdir[i]; 3076 if (pde && pmap_pde_v(pde)) { 3077 for (j = 0; j < NPTEPG; j++) { 3078 vm_offset_t va = base + (j << PAGE_SHIFT); 3079 if (va >= (vm_offset_t) VM_MIN_KERNEL_ADDRESS) { 3080 if (index) { 3081 index = 0; 3082 printf("\n"); 3083 } 3084 sx_sunlock(&allproc_lock); 3085 return npte; 3086 } 3087 pte = pmap_pte(pmap, va); 3088 if (pte && pmap_pte_v(pte)) { 3089 pt_entry_t pa; 3090 vm_page_t m; 3091 pa = *pte; 3092 m = PHYS_TO_VM_PAGE(pa); 3093 printf("va: 0x%x, pt: 0x%x, h: %d, w: %d, f: 0x%x", 3094 va, pa, m->hold_count, m->wire_count, m->flags); 3095 npte++; 3096 index++; 3097 if (index >= 2) { 3098 index = 0; 3099 printf("\n"); 3100 } else { 3101 printf(" "); 3102 } 3103 } 3104 } 3105 } 3106 } 3107 } 3108 } 3109 sx_sunlock(&allproc_lock); 3110 return npte; 3111} 3112#endif 3113 3114#if defined(DEBUG) 3115 3116static void pads(pmap_t pm); 3117void pmap_pvdump(vm_offset_t pa); 3118 3119/* print address space of pmap*/ 3120static void 3121pads(pm) 3122 pmap_t pm; 3123{ 3124 int i, j; 3125 vm_paddr_t va; 3126 pt_entry_t *ptep; 3127 3128 if (pm == kernel_pmap) 3129 return; 3130 for (i = 0; i < NPDEPTD; i++) 3131 if (pm->pm_pdir[i]) 3132 for (j = 0; j < NPTEPG; j++) { 3133 va = (i << PDRSHIFT) + (j << PAGE_SHIFT); 3134 if (pm == kernel_pmap && va < KERNBASE) 3135 continue; 3136 if (pm != kernel_pmap && va > UPT_MAX_ADDRESS) 3137 continue; 3138 ptep = pmap_pte(pm, va); 3139 if (pmap_pte_v(ptep)) 3140 printf("%x:%x ", va, *ptep); 3141 }; 3142 3143} 3144 3145void 3146pmap_pvdump(pa) 3147 vm_paddr_t pa; 3148{ 3149 pv_entry_t pv; 3150 vm_page_t m; 3151 3152 printf("pa %x", pa); 3153 m = PHYS_TO_VM_PAGE(pa); 3154 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 3155 printf(" -> pmap %p, va %x", (void *)pv->pv_pmap, pv->pv_va); 3156 pads(pv->pv_pmap); 3157 } 3158 printf(" "); 3159} 3160#endif 3161