pmap.c revision 132365
118316Swollman/*- 218316Swollman * Copyright (c) 1991 Regents of the University of California. 318316Swollman * All rights reserved. 418316Swollman * Copyright (c) 1994 John S. Dyson 518316Swollman * All rights reserved. 618316Swollman * Copyright (c) 1994 David Greenman 718316Swollman * All rights reserved. 818316Swollman * 918316Swollman * This code is derived from software contributed to Berkeley by 1018316Swollman * the Systems Programming Group of the University of Utah Computer 1118316Swollman * Science Department and William Jolitz of UUNET Technologies Inc. 1218316Swollman * 1318316Swollman * Redistribution and use in source and binary forms, with or without 1418316Swollman * modification, are permitted provided that the following conditions 1518316Swollman * are met: 1618316Swollman * 1. Redistributions of source code must retain the above copyright 1718316Swollman * notice, this list of conditions and the following disclaimer. 1818316Swollman * 2. Redistributions in binary form must reproduce the above copyright 1918316Swollman * notice, this list of conditions and the following disclaimer in the 2018316Swollman * documentation and/or other materials provided with the distribution. 2118316Swollman * 3. All advertising materials mentioning features or use of this software 2218316Swollman * must display the following acknowledgement: 2318316Swollman * This product includes software developed by the University of 2418316Swollman * California, Berkeley and its contributors. 2518316Swollman * 4. Neither the name of the University nor the names of its contributors 2618316Swollman * may be used to endorse or promote products derived from this software 2718316Swollman * without specific prior written permission. 2818316Swollman * 2918316Swollman * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 3018316Swollman * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 3118316Swollman * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 3218316Swollman * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 3318316Swollman * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 3419885Swollman * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3518316Swollman * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3618316Swollman * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3718316Swollman * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3818316Swollman * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3918316Swollman * SUCH DAMAGE. 4018316Swollman * 4118316Swollman * from: @(#)pmap.c 7.7 (Berkeley) 5/12/91 4218316Swollman */ 4318316Swollman/*- 4418316Swollman * Copyright (c) 2003 Networks Associates Technology, Inc. 4518316Swollman * All rights reserved. 4618316Swollman * 4718316Swollman * This software was developed for the FreeBSD Project by Jake Burkholder, 4818316Swollman * Safeport Network Services, and Network Associates Laboratories, the 4918316Swollman * Security Research Division of Network Associates, Inc. under 5018316Swollman * DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA 5118316Swollman * CHATS research program. 5218316Swollman * 5318316Swollman * Redistribution and use in source and binary forms, with or without 5418316Swollman * modification, are permitted provided that the following conditions 5518316Swollman * are met: 5618316Swollman * 1. Redistributions of source code must retain the above copyright 5718316Swollman * notice, this list of conditions and the following disclaimer. 5818316Swollman * 2. Redistributions in binary form must reproduce the above copyright 5918316Swollman * notice, this list of conditions and the following disclaimer in the 6018316Swollman * documentation and/or other materials provided with the distribution. 6118316Swollman * 6218316Swollman * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 6318316Swollman * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 6418316Swollman * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 6518316Swollman * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 6618316Swollman * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 6718316Swollman * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 6818316Swollman * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 6918316Swollman * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 7018316Swollman * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 7118316Swollman * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 7218316Swollman * SUCH DAMAGE. 7318316Swollman */ 7418316Swollman 7518316Swollman#include <sys/cdefs.h> 7618316Swollman__FBSDID("$FreeBSD: head/sys/i386/i386/pmap.c 132365 2004-07-18 21:19:10Z alc $"); 7718316Swollman 7818316Swollman/* 7918316Swollman * Manages physical address maps. 8018316Swollman * 8118316Swollman * In addition to hardware address maps, this 8218316Swollman * module is called upon to provide software-use-only 8318316Swollman * maps which may or may not be stored in the same 8418316Swollman * form as hardware maps. These pseudo-maps are 8518316Swollman * used to store intermediate results from copy 8618316Swollman * operations to and from address spaces. 8718316Swollman * 8818316Swollman * Since the information managed by this module is 8918316Swollman * also stored by the logical address mapping module, 9018316Swollman * this module may throw away valid virtual-to-physical 9118316Swollman * mappings at almost any time. However, invalidations 9218316Swollman * of virtual-to-physical mappings must be done as 9319885Swollman * requested. 9419885Swollman * 9519885Swollman * In order to cope with hardware architectures which 9618316Swollman * make virtual-to-physical map invalidates expensive, 9719885Swollman * this module may delay invalidate or reduced protection 9818316Swollman * operations until such time as they are actually 9918316Swollman * necessary. This module is given full information as 10018316Swollman * to which processors are currently using which maps, 10118316Swollman * and to when physical maps must be made correct. 10218316Swollman */ 10318316Swollman 10418316Swollman#include "opt_cpu.h" 10518316Swollman#include "opt_pmap.h" 10618316Swollman#include "opt_msgbuf.h" 10718316Swollman#include "opt_kstack_pages.h" 10818316Swollman 10918316Swollman#include <sys/param.h> 11018316Swollman#include <sys/systm.h> 11118316Swollman#include <sys/kernel.h> 11218316Swollman#include <sys/lock.h> 11318316Swollman#include <sys/mman.h> 11418316Swollman#include <sys/msgbuf.h> 11518316Swollman#include <sys/mutex.h> 11618316Swollman#include <sys/proc.h> 11718316Swollman#include <sys/sx.h> 11818316Swollman#include <sys/user.h> 11918316Swollman#include <sys/vmmeter.h> 12018316Swollman#include <sys/sched.h> 12118316Swollman#include <sys/sysctl.h> 12218316Swollman#ifdef SMP 12318316Swollman#include <sys/smp.h> 12418316Swollman#endif 12518316Swollman 12618316Swollman#include <vm/vm.h> 12718316Swollman#include <vm/vm_param.h> 12818316Swollman#include <vm/vm_kern.h> 12918316Swollman#include <vm/vm_page.h> 13018316Swollman#include <vm/vm_map.h> 13118316Swollman#include <vm/vm_object.h> 13218316Swollman#include <vm/vm_extern.h> 13319885Swollman#include <vm/vm_pageout.h> 13419885Swollman#include <vm/vm_pager.h> 13519885Swollman#include <vm/uma.h> 13619885Swollman 13719885Swollman#include <machine/cpu.h> 13819885Swollman#include <machine/cputypes.h> 13918316Swollman#include <machine/md_var.h> 14019885Swollman#include <machine/specialreg.h> 14118316Swollman#ifdef SMP 14218316Swollman#include <machine/smp.h> 14318316Swollman#endif 14418316Swollman 14518316Swollman#if !defined(CPU_ENABLE_SSE) && defined(I686_CPU) 14618316Swollman#define CPU_ENABLE_SSE 14718316Swollman#endif 14818316Swollman#if defined(CPU_DISABLE_SSE) 14918316Swollman#undef CPU_ENABLE_SSE 15018316Swollman#endif 15118316Swollman 15218316Swollman#ifndef PMAP_SHPGPERPROC 15318316Swollman#define PMAP_SHPGPERPROC 200 15418316Swollman#endif 15518316Swollman 15618316Swollman#if defined(DIAGNOSTIC) 15718316Swollman#define PMAP_DIAGNOSTIC 15818316Swollman#endif 15918316Swollman 16019885Swollman#define MINPV 2048 16119885Swollman 16219885Swollman#if !defined(PMAP_DIAGNOSTIC) 16319885Swollman#define PMAP_INLINE __inline 16418316Swollman#else 16518316Swollman#define PMAP_INLINE 16619885Swollman#endif 16718316Swollman 16818316Swollman/* 16918316Swollman * Get PDEs and PTEs for user/kernel address space 17018316Swollman */ 17119885Swollman#define pmap_pde(m, v) (&((m)->pm_pdir[(vm_offset_t)(v) >> PDRSHIFT])) 17219885Swollman#define pdir_pde(m, v) (m[(vm_offset_t)(v) >> PDRSHIFT]) 17318316Swollman 17418316Swollman#define pmap_pde_v(pte) ((*(int *)pte & PG_V) != 0) 17518316Swollman#define pmap_pte_w(pte) ((*(int *)pte & PG_W) != 0) 17618316Swollman#define pmap_pte_m(pte) ((*(int *)pte & PG_M) != 0) 17718316Swollman#define pmap_pte_u(pte) ((*(int *)pte & PG_A) != 0) 17818316Swollman#define pmap_pte_v(pte) ((*(int *)pte & PG_V) != 0) 17918316Swollman 18018316Swollman#define pmap_pte_set_w(pte, v) ((v) ? atomic_set_int((u_int *)(pte), PG_W) : \ 18118316Swollman atomic_clear_int((u_int *)(pte), PG_W)) 18218316Swollman#define pmap_pte_set_prot(pte, v) ((*(int *)pte &= ~PG_PROT), (*(int *)pte |= (v))) 18318316Swollman 18418316Swollmanstruct pmap kernel_pmap_store; 18518316SwollmanLIST_HEAD(pmaplist, pmap); 18618316Swollmanstatic struct pmaplist allpmaps; 18718316Swollmanstatic struct mtx allpmaps_lock; 18818316Swollman#ifdef SMP 18918316Swollmanstatic struct mtx lazypmap_lock; 19018316Swollman#endif 19118316Swollman 19218316Swollmanvm_paddr_t avail_end; /* PA of last available physical page */ 19318316Swollmanvm_offset_t virtual_avail; /* VA of first avail page (after kernel bss) */ 19418316Swollmanvm_offset_t virtual_end; /* VA of last avail page (end of kernel AS) */ 19518316Swollmanstatic boolean_t pmap_initialized = FALSE; /* Has pmap_init completed? */ 19618316Swollmanint pgeflag = 0; /* PG_G or-in */ 19718316Swollmanint pseflag = 0; /* PG_PS or-in */ 19818316Swollman 19918316Swollmanstatic int nkpt; 20018316Swollmanvm_offset_t kernel_vm_end; 20118316Swollmanextern u_int32_t KERNend; 20218316Swollman 20318316Swollman#ifdef PAE 20418316Swollmanstatic uma_zone_t pdptzone; 20518316Swollman#endif 20618316Swollman 20718316Swollman/* 20818316Swollman * Data for the pv entry allocation mechanism 20918316Swollman */ 21018316Swollmanstatic uma_zone_t pvzone; 21118316Swollmanstatic struct vm_object pvzone_obj; 21218316Swollmanstatic int pv_entry_count = 0, pv_entry_max = 0, pv_entry_high_water = 0; 21318316Swollmanint pmap_pagedaemon_waken; 21418316Swollman 21518316Swollman/* 21618316Swollman * All those kernel PT submaps that BSD is so fond of 21718316Swollman */ 21818316Swollmanpt_entry_t *CMAP1 = 0; 21918316Swollmanstatic pt_entry_t *CMAP2, *CMAP3; 22018316Swollmancaddr_t CADDR1 = 0, ptvmmap = 0; 22118316Swollmanstatic caddr_t CADDR2, CADDR3; 22218316Swollmanstatic struct mtx CMAPCADDR12_lock; 22318316Swollmanstruct msgbuf *msgbufp = 0; 22418316Swollman 22518316Swollman/* 22618316Swollman * Crashdump maps. 22718316Swollman */ 22818316Swollmanstatic caddr_t crashdumpmap; 22918316Swollman 23018316Swollman#ifdef SMP 23118316Swollmanextern pt_entry_t *SMPpt; 23218316Swollman#endif 23318316Swollmanstatic pt_entry_t *PMAP1 = 0, *PMAP2; 23418316Swollmanstatic pt_entry_t *PADDR1 = 0, *PADDR2; 23518316Swollman#ifdef SMP 23618316Swollmanstatic int PMAP1cpu; 23718316Swollmanstatic int PMAP1changedcpu; 23818316SwollmanSYSCTL_INT(_debug, OID_AUTO, PMAP1changedcpu, CTLFLAG_RD, 23918316Swollman &PMAP1changedcpu, 0, 24018316Swollman "Number of times pmap_pte_quick changed CPU with same PMAP1"); 24118316Swollman#endif 24218316Swollmanstatic int PMAP1changed; 24318316SwollmanSYSCTL_INT(_debug, OID_AUTO, PMAP1changed, CTLFLAG_RD, 24418316Swollman &PMAP1changed, 0, 24518316Swollman "Number of times pmap_pte_quick changed PMAP1"); 24618316Swollmanstatic int PMAP1unchanged; 24718316SwollmanSYSCTL_INT(_debug, OID_AUTO, PMAP1unchanged, CTLFLAG_RD, 24818316Swollman &PMAP1unchanged, 0, 24918316Swollman "Number of times pmap_pte_quick didn't change PMAP1"); 25018316Swollman 25118316Swollmanstatic PMAP_INLINE void free_pv_entry(pv_entry_t pv); 25218316Swollmanstatic pv_entry_t get_pv_entry(void); 25318316Swollmanstatic void pmap_clear_ptes(vm_page_t m, int bit); 25418316Swollman 25518316Swollmanstatic int pmap_remove_pte(pmap_t pmap, pt_entry_t *ptq, vm_offset_t sva); 25619885Swollmanstatic void pmap_remove_page(struct pmap *pmap, vm_offset_t va); 25719885Swollmanstatic int pmap_remove_entry(struct pmap *pmap, vm_page_t m, 25819885Swollman vm_offset_t va); 25919885Swollmanstatic void pmap_insert_entry(pmap_t pmap, vm_offset_t va, vm_page_t m); 26019885Swollman 26118316Swollmanstatic vm_page_t pmap_allocpte(pmap_t pmap, vm_offset_t va); 26218316Swollman 26318316Swollmanstatic vm_page_t _pmap_allocpte(pmap_t pmap, unsigned ptepindex); 26418316Swollmanstatic pt_entry_t *pmap_pte_quick(pmap_t pmap, vm_offset_t va); 26518316Swollmanstatic int pmap_unuse_pt(pmap_t, vm_offset_t); 26618316Swollmanstatic vm_offset_t pmap_kmem_choose(vm_offset_t addr); 26718316Swollman#ifdef PAE 26818316Swollmanstatic void *pmap_pdpt_allocf(uma_zone_t zone, int bytes, u_int8_t *flags, int wait); 26918316Swollman#endif 27018316Swollman 27118316SwollmanCTASSERT(1 << PDESHIFT == sizeof(pd_entry_t)); 27218316SwollmanCTASSERT(1 << PTESHIFT == sizeof(pt_entry_t)); 27318316Swollman 27418316Swollman/* 27518316Swollman * Move the kernel virtual free pointer to the next 27619885Swollman * 4MB. This is used to help improve performance 27718316Swollman * by using a large (4MB) page for much of the kernel 27818316Swollman * (.text, .data, .bss) 27918316Swollman */ 28018316Swollmanstatic vm_offset_t 28118316Swollmanpmap_kmem_choose(vm_offset_t addr) 28218316Swollman{ 28318316Swollman vm_offset_t newaddr = addr; 28418316Swollman 28518316Swollman#ifndef DISABLE_PSE 28618316Swollman if (cpu_feature & CPUID_PSE) 28718316Swollman newaddr = (addr + PDRMASK) & ~PDRMASK; 28818316Swollman#endif 28918316Swollman return newaddr; 29019885Swollman} 29119885Swollman 29219885Swollman/* 29319885Swollman * Bootstrap the system enough to run with virtual memory. 29419885Swollman * 29519885Swollman * On the i386 this is called after mapping has already been enabled 29619885Swollman * and just syncs the pmap module with what has already been done. 29719885Swollman * [We can't call it easily with mapping off since the kernel is not 29819885Swollman * mapped with PA == VA, hence we would have to relocate every address 29918316Swollman * from the linked base (virtual) address "KERNBASE" to the actual 30018316Swollman * (physical) address starting relative to 0] 30118316Swollman */ 30218316Swollmanvoid 30318316Swollmanpmap_bootstrap(firstaddr, loadaddr) 30418316Swollman vm_paddr_t firstaddr; 30518316Swollman vm_paddr_t loadaddr; 30618316Swollman{ 30718316Swollman vm_offset_t va; 30818316Swollman pt_entry_t *pte, *unused; 30918316Swollman int i; 31018316Swollman 31118316Swollman /* 31218316Swollman * XXX The calculation of virtual_avail is wrong. It's NKPT*PAGE_SIZE too 31318316Swollman * large. It should instead be correctly calculated in locore.s and 31419885Swollman * not based on 'first' (which is a physical address, not a virtual 31518316Swollman * address, for the start of unused physical memory). The kernel 31618316Swollman * page tables are NOT double mapped and thus should not be included 31718316Swollman * in this calculation. 31819885Swollman */ 31918316Swollman virtual_avail = (vm_offset_t) KERNBASE + firstaddr; 32018316Swollman virtual_avail = pmap_kmem_choose(virtual_avail); 32118316Swollman 32218316Swollman virtual_end = VM_MAX_KERNEL_ADDRESS; 32318316Swollman 32418316Swollman /* 32518316Swollman * Initialize the kernel pmap (which is statically allocated). 32618316Swollman */ 32718316Swollman PMAP_LOCK_INIT(kernel_pmap); 32818316Swollman kernel_pmap->pm_pdir = (pd_entry_t *) (KERNBASE + (u_int)IdlePTD); 32918316Swollman#ifdef PAE 33018316Swollman kernel_pmap->pm_pdpt = (pdpt_entry_t *) (KERNBASE + (u_int)IdlePDPT); 33118316Swollman#endif 33218316Swollman kernel_pmap->pm_active = -1; /* don't allow deactivation */ 33318316Swollman TAILQ_INIT(&kernel_pmap->pm_pvlist); 33418316Swollman LIST_INIT(&allpmaps); 33518316Swollman#ifdef SMP 33618316Swollman mtx_init(&lazypmap_lock, "lazypmap", NULL, MTX_SPIN); 33718316Swollman#endif 33818316Swollman mtx_init(&allpmaps_lock, "allpmaps", NULL, MTX_SPIN); 33918316Swollman mtx_lock_spin(&allpmaps_lock); 34018316Swollman LIST_INSERT_HEAD(&allpmaps, kernel_pmap, pm_list); 34118316Swollman mtx_unlock_spin(&allpmaps_lock); 34218316Swollman nkpt = NKPT; 34318316Swollman 34418316Swollman /* 34518316Swollman * Reserve some special page table entries/VA space for temporary 34618316Swollman * mapping of pages. 34718316Swollman */ 34818316Swollman#define SYSMAP(c, p, v, n) \ 34918316Swollman v = (c)va; va += ((n)*PAGE_SIZE); p = pte; pte += (n); 35018316Swollman 35118316Swollman va = virtual_avail; 35218316Swollman pte = vtopte(va); 35318316Swollman 35418316Swollman /* 35518316Swollman * CMAP1/CMAP2 are used for zeroing and copying pages. 35618316Swollman * CMAP3 is used for the idle process page zeroing. 35718316Swollman */ 35818316Swollman SYSMAP(caddr_t, CMAP1, CADDR1, 1) 35918316Swollman SYSMAP(caddr_t, CMAP2, CADDR2, 1) 36018316Swollman SYSMAP(caddr_t, CMAP3, CADDR3, 1) 36118316Swollman *CMAP3 = 0; 36218316Swollman 36318316Swollman mtx_init(&CMAPCADDR12_lock, "CMAPCADDR12", NULL, MTX_DEF); 36418316Swollman 36518316Swollman /* 36618316Swollman * Crashdump maps. 36718316Swollman */ 36818316Swollman SYSMAP(caddr_t, unused, crashdumpmap, MAXDUMPPGS) 36918316Swollman 37018316Swollman /* 37118316Swollman * ptvmmap is used for reading arbitrary physical pages via /dev/mem. 37218316Swollman */ 37318316Swollman SYSMAP(caddr_t, unused, ptvmmap, 1) 37418316Swollman 37518316Swollman /* 37618316Swollman * msgbufp is used to map the system message buffer. 37718316Swollman */ 37818316Swollman SYSMAP(struct msgbuf *, unused, msgbufp, atop(round_page(MSGBUF_SIZE))) 37918316Swollman 38018316Swollman /* 38118316Swollman * ptemap is used for pmap_pte_quick 38218316Swollman */ 38318316Swollman SYSMAP(pt_entry_t *, PMAP1, PADDR1, 1); 38418316Swollman SYSMAP(pt_entry_t *, PMAP2, PADDR2, 1); 38518316Swollman 38618316Swollman virtual_avail = va; 38718316Swollman 38818316Swollman *CMAP1 = *CMAP2 = 0; 38918316Swollman for (i = 0; i < NKPT; i++) 39019885Swollman PTD[i] = 0; 39118316Swollman 39218316Swollman /* Turn on PG_G on kernel page(s) */ 39318316Swollman pmap_set_pg(); 39418316Swollman} 39518316Swollman 39618316Swollman/* 39719885Swollman * Set PG_G on kernel pages. Only the BSP calls this when SMP is turned on. 39818316Swollman */ 39918316Swollmanvoid 40018316Swollmanpmap_set_pg(void) 40118316Swollman{ 40218316Swollman pd_entry_t pdir; 40318316Swollman pt_entry_t *pte; 40418316Swollman vm_offset_t va, endva; 40518316Swollman int i; 40618316Swollman 40718316Swollman if (pgeflag == 0) 40819885Swollman return; 40919885Swollman 41019885Swollman i = KERNLOAD/NBPDR; 41119885Swollman endva = KERNBASE + KERNend; 41219885Swollman 41318316Swollman if (pseflag) { 41419885Swollman va = KERNBASE + KERNLOAD; 41519885Swollman while (va < endva) { 41618316Swollman pdir = kernel_pmap->pm_pdir[KPTDI+i]; 41719885Swollman pdir |= pgeflag; 41819885Swollman kernel_pmap->pm_pdir[KPTDI+i] = PTD[KPTDI+i] = pdir; 41919885Swollman invltlb(); /* Play it safe, invltlb() every time */ 42019885Swollman i++; 42119885Swollman va += NBPDR; 42219885Swollman } 42319885Swollman } else { 42419885Swollman va = (vm_offset_t)btext; 42519885Swollman while (va < endva) { 42618316Swollman pte = vtopte(va); 42718316Swollman if (*pte) 42818316Swollman *pte |= pgeflag; 42918316Swollman invltlb(); /* Play it safe, invltlb() every time */ 43018316Swollman va += PAGE_SIZE; 43118316Swollman } 43218316Swollman } 43318316Swollman} 43418316Swollman 43518316Swollman#ifdef PAE 43618316Swollmanstatic void * 43718316Swollmanpmap_pdpt_allocf(uma_zone_t zone, int bytes, u_int8_t *flags, int wait) 43818316Swollman{ 43918316Swollman *flags = UMA_SLAB_PRIV; 44018316Swollman return (contigmalloc(PAGE_SIZE, NULL, 0, 0x0ULL, 0xffffffffULL, 1, 0)); 44118316Swollman} 44218316Swollman#endif 44318316Swollman 44418316Swollman/* 44518316Swollman * Initialize the pmap module. 44618316Swollman * Called by vm_init, to initialize any structures that the pmap 44719885Swollman * system needs to map virtual memory. 44819885Swollman * pmap_init has been enhanced to support in a fairly consistant 44918316Swollman * way, discontiguous physical memory. 45018316Swollman */ 45118316Swollmanvoid 45218316Swollmanpmap_init(void) 45318316Swollman{ 45418316Swollman int i; 45518316Swollman 45618316Swollman /* 45718316Swollman * Allocate memory for random pmap data structures. Includes the 45818316Swollman * pv_head_table. 45918316Swollman */ 46018316Swollman 46118316Swollman for(i = 0; i < vm_page_array_size; i++) { 46218316Swollman vm_page_t m; 46318316Swollman 46418316Swollman m = &vm_page_array[i]; 46518316Swollman TAILQ_INIT(&m->md.pv_list); 46619885Swollman m->md.pv_list_count = 0; 46718316Swollman } 46818316Swollman 46918316Swollman /* 47018316Swollman * init the pv free list 47118316Swollman */ 47218316Swollman pvzone = uma_zcreate("PV ENTRY", sizeof (struct pv_entry), NULL, NULL, 47318316Swollman NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_VM | UMA_ZONE_NOFREE); 47418316Swollman uma_prealloc(pvzone, MINPV); 47518316Swollman 47618316Swollman#ifdef PAE 47718316Swollman pdptzone = uma_zcreate("PDPT", NPGPTD * sizeof(pdpt_entry_t), NULL, 47818316Swollman NULL, NULL, NULL, (NPGPTD * sizeof(pdpt_entry_t)) - 1, 47918316Swollman UMA_ZONE_VM | UMA_ZONE_NOFREE); 48018316Swollman uma_zone_set_allocf(pdptzone, pmap_pdpt_allocf); 48118316Swollman#endif 48218316Swollman 48318316Swollman /* 48418316Swollman * Now it is safe to enable pv_table recording. 48518316Swollman */ 48618316Swollman pmap_initialized = TRUE; 48718316Swollman} 48818316Swollman 48918316Swollman/* 49018316Swollman * Initialize the address space (zone) for the pv_entries. Set a 49118316Swollman * high water mark so that the system can recover from excessive 49218316Swollman * numbers of pv entries. 49318316Swollman */ 49419885Swollmanvoid 49519885Swollmanpmap_init2() 49619885Swollman{ 49719885Swollman int shpgperproc = PMAP_SHPGPERPROC; 49818316Swollman 49918316Swollman TUNABLE_INT_FETCH("vm.pmap.shpgperproc", &shpgperproc); 50018316Swollman pv_entry_max = shpgperproc * maxproc + vm_page_array_size; 50119885Swollman TUNABLE_INT_FETCH("vm.pmap.pv_entries", &pv_entry_max); 50218316Swollman pv_entry_high_water = 9 * (pv_entry_max / 10); 50318316Swollman uma_zone_set_obj(pvzone, &pvzone_obj, pv_entry_max); 50419885Swollman} 50519885Swollman 50619885Swollman 50719885Swollman/*************************************************** 50819885Swollman * Low level helper routines..... 50918316Swollman ***************************************************/ 51018316Swollman 51118316Swollman#if defined(PMAP_DIAGNOSTIC) 51218316Swollman 51318316Swollman/* 51418316Swollman * This code checks for non-writeable/modified pages. 51518316Swollman * This should be an invalid condition. 51618316Swollman */ 51718316Swollmanstatic int 51818316Swollmanpmap_nw_modified(pt_entry_t ptea) 51918316Swollman{ 52018316Swollman int pte; 52118316Swollman 52218316Swollman pte = (int) ptea; 52318316Swollman 52418316Swollman if ((pte & (PG_M|PG_RW)) == PG_M) 52518316Swollman return 1; 52618316Swollman else 52718316Swollman return 0; 52818316Swollman} 52918316Swollman#endif 53018316Swollman 53118316Swollman 53218316Swollman/* 53318316Swollman * this routine defines the region(s) of memory that should 53419885Swollman * not be tested for the modified bit. 53518316Swollman */ 53618316Swollmanstatic PMAP_INLINE int 53718316Swollmanpmap_track_modified(vm_offset_t va) 53818316Swollman{ 53918316Swollman if ((va < kmi.clean_sva) || (va >= kmi.clean_eva)) 54018316Swollman return 1; 54118316Swollman else 54218316Swollman return 0; 54318316Swollman} 54418316Swollman 54518316Swollman#ifdef I386_CPU 54618316Swollman/* 54718316Swollman * i386 only has "invalidate everything" and no SMP to worry about. 54818316Swollman */ 54918316SwollmanPMAP_INLINE void 55018316Swollmanpmap_invalidate_page(pmap_t pmap, vm_offset_t va) 55118316Swollman{ 55218316Swollman 55318316Swollman if (pmap == kernel_pmap || pmap->pm_active) 55418316Swollman invltlb(); 55518316Swollman} 55618316Swollman 55718316SwollmanPMAP_INLINE void 55818316Swollmanpmap_invalidate_range(pmap_t pmap, vm_offset_t sva, vm_offset_t eva) 55918316Swollman{ 56018316Swollman 56118316Swollman if (pmap == kernel_pmap || pmap->pm_active) 56218316Swollman invltlb(); 56318316Swollman} 56418316Swollman 56518316SwollmanPMAP_INLINE void 56618316Swollmanpmap_invalidate_all(pmap_t pmap) 56718316Swollman{ 56818316Swollman 56918316Swollman if (pmap == kernel_pmap || pmap->pm_active) 57018316Swollman invltlb(); 57118316Swollman} 57218316Swollman#else /* !I386_CPU */ 57318316Swollman#ifdef SMP 57418316Swollman/* 57518316Swollman * For SMP, these functions have to use the IPI mechanism for coherence. 57618316Swollman */ 57718316Swollmanvoid 57818316Swollmanpmap_invalidate_page(pmap_t pmap, vm_offset_t va) 57918316Swollman{ 58018316Swollman u_int cpumask; 58118316Swollman u_int other_cpus; 58218316Swollman 58318316Swollman if (smp_started) { 58418316Swollman if (!(read_eflags() & PSL_I)) 58518316Swollman panic("%s: interrupts disabled", __func__); 58618316Swollman mtx_lock_spin(&smp_tlb_mtx); 58718316Swollman } else 58818316Swollman critical_enter(); 58918316Swollman /* 59018316Swollman * We need to disable interrupt preemption but MUST NOT have 59118316Swollman * interrupts disabled here. 59218316Swollman * XXX we may need to hold schedlock to get a coherent pm_active 59318316Swollman * XXX critical sections disable interrupts again 59418316Swollman */ 59518316Swollman if (pmap == kernel_pmap || pmap->pm_active == all_cpus) { 59618316Swollman invlpg(va); 59718316Swollman smp_invlpg(va); 59818316Swollman } else { 59918316Swollman cpumask = PCPU_GET(cpumask); 60018316Swollman other_cpus = PCPU_GET(other_cpus); 60118316Swollman if (pmap->pm_active & cpumask) 60218316Swollman invlpg(va); 60319885Swollman if (pmap->pm_active & other_cpus) 60419885Swollman smp_masked_invlpg(pmap->pm_active & other_cpus, va); 60519885Swollman } 60618316Swollman if (smp_started) 60718316Swollman mtx_unlock_spin(&smp_tlb_mtx); 60818316Swollman else 60918316Swollman critical_exit(); 61018316Swollman} 61119885Swollman 61218316Swollmanvoid 61318316Swollmanpmap_invalidate_range(pmap_t pmap, vm_offset_t sva, vm_offset_t eva) 61418316Swollman{ 61518316Swollman u_int cpumask; 61619885Swollman u_int other_cpus; 61719885Swollman vm_offset_t addr; 61819885Swollman 61919885Swollman if (smp_started) { 62019885Swollman if (!(read_eflags() & PSL_I)) 621 panic("%s: interrupts disabled", __func__); 622 mtx_lock_spin(&smp_tlb_mtx); 623 } else 624 critical_enter(); 625 /* 626 * We need to disable interrupt preemption but MUST NOT have 627 * interrupts disabled here. 628 * XXX we may need to hold schedlock to get a coherent pm_active 629 * XXX critical sections disable interrupts again 630 */ 631 if (pmap == kernel_pmap || pmap->pm_active == all_cpus) { 632 for (addr = sva; addr < eva; addr += PAGE_SIZE) 633 invlpg(addr); 634 smp_invlpg_range(sva, eva); 635 } else { 636 cpumask = PCPU_GET(cpumask); 637 other_cpus = PCPU_GET(other_cpus); 638 if (pmap->pm_active & cpumask) 639 for (addr = sva; addr < eva; addr += PAGE_SIZE) 640 invlpg(addr); 641 if (pmap->pm_active & other_cpus) 642 smp_masked_invlpg_range(pmap->pm_active & other_cpus, 643 sva, eva); 644 } 645 if (smp_started) 646 mtx_unlock_spin(&smp_tlb_mtx); 647 else 648 critical_exit(); 649} 650 651void 652pmap_invalidate_all(pmap_t pmap) 653{ 654 u_int cpumask; 655 u_int other_cpus; 656 657 if (smp_started) { 658 if (!(read_eflags() & PSL_I)) 659 panic("%s: interrupts disabled", __func__); 660 mtx_lock_spin(&smp_tlb_mtx); 661 } else 662 critical_enter(); 663 /* 664 * We need to disable interrupt preemption but MUST NOT have 665 * interrupts disabled here. 666 * XXX we may need to hold schedlock to get a coherent pm_active 667 * XXX critical sections disable interrupts again 668 */ 669 if (pmap == kernel_pmap || pmap->pm_active == all_cpus) { 670 invltlb(); 671 smp_invltlb(); 672 } else { 673 cpumask = PCPU_GET(cpumask); 674 other_cpus = PCPU_GET(other_cpus); 675 if (pmap->pm_active & cpumask) 676 invltlb(); 677 if (pmap->pm_active & other_cpus) 678 smp_masked_invltlb(pmap->pm_active & other_cpus); 679 } 680 if (smp_started) 681 mtx_unlock_spin(&smp_tlb_mtx); 682 else 683 critical_exit(); 684} 685#else /* !SMP */ 686/* 687 * Normal, non-SMP, 486+ invalidation functions. 688 * We inline these within pmap.c for speed. 689 */ 690PMAP_INLINE void 691pmap_invalidate_page(pmap_t pmap, vm_offset_t va) 692{ 693 694 if (pmap == kernel_pmap || pmap->pm_active) 695 invlpg(va); 696} 697 698PMAP_INLINE void 699pmap_invalidate_range(pmap_t pmap, vm_offset_t sva, vm_offset_t eva) 700{ 701 vm_offset_t addr; 702 703 if (pmap == kernel_pmap || pmap->pm_active) 704 for (addr = sva; addr < eva; addr += PAGE_SIZE) 705 invlpg(addr); 706} 707 708PMAP_INLINE void 709pmap_invalidate_all(pmap_t pmap) 710{ 711 712 if (pmap == kernel_pmap || pmap->pm_active) 713 invltlb(); 714} 715#endif /* !SMP */ 716#endif /* !I386_CPU */ 717 718/* 719 * Are we current address space or kernel? N.B. We return FALSE when 720 * a pmap's page table is in use because a kernel thread is borrowing 721 * it. The borrowed page table can change spontaneously, making any 722 * dependence on its continued use subject to a race condition. 723 */ 724static __inline int 725pmap_is_current(pmap_t pmap) 726{ 727 728 return (pmap == kernel_pmap || 729 (pmap == vmspace_pmap(curthread->td_proc->p_vmspace) && 730 (pmap->pm_pdir[PTDPTDI] & PG_FRAME) == (PTDpde[0] & PG_FRAME))); 731} 732 733/* 734 * If the given pmap is not the current pmap, Giant must be held. 735 */ 736pt_entry_t * 737pmap_pte(pmap_t pmap, vm_offset_t va) 738{ 739 pd_entry_t newpf; 740 pd_entry_t *pde; 741 742 pde = pmap_pde(pmap, va); 743 if (*pde & PG_PS) 744 return (pde); 745 if (*pde != 0) { 746 /* are we current address space or kernel? */ 747 if (pmap_is_current(pmap)) 748 return (vtopte(va)); 749 GIANT_REQUIRED; 750 newpf = *pde & PG_FRAME; 751 if ((*PMAP2 & PG_FRAME) != newpf) { 752 *PMAP2 = newpf | PG_RW | PG_V | PG_A | PG_M; 753 pmap_invalidate_page(kernel_pmap, (vm_offset_t)PADDR2); 754 } 755 return (PADDR2 + (i386_btop(va) & (NPTEPG - 1))); 756 } 757 return (0); 758} 759 760static __inline void 761invlcaddr(void *caddr) 762{ 763#ifdef I386_CPU 764 invltlb(); 765#else 766 invlpg((u_int)caddr); 767#endif 768} 769 770/* 771 * Super fast pmap_pte routine best used when scanning 772 * the pv lists. This eliminates many coarse-grained 773 * invltlb calls. Note that many of the pv list 774 * scans are across different pmaps. It is very wasteful 775 * to do an entire invltlb for checking a single mapping. 776 * 777 * If the given pmap is not the current pmap, vm_page_queue_mtx 778 * must be held and curthread pinned to a CPU. 779 */ 780static pt_entry_t * 781pmap_pte_quick(pmap_t pmap, vm_offset_t va) 782{ 783 pd_entry_t newpf; 784 pd_entry_t *pde; 785 786 pde = pmap_pde(pmap, va); 787 if (*pde & PG_PS) 788 return (pde); 789 if (*pde != 0) { 790 /* are we current address space or kernel? */ 791 if (pmap_is_current(pmap)) 792 return (vtopte(va)); 793 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 794 KASSERT(curthread->td_pinned > 0, ("curthread not pinned")); 795 newpf = *pde & PG_FRAME; 796 if ((*PMAP1 & PG_FRAME) != newpf) { 797 *PMAP1 = newpf | PG_RW | PG_V | PG_A | PG_M; 798#ifdef SMP 799 PMAP1cpu = PCPU_GET(cpuid); 800#endif 801 invlcaddr(PADDR1); 802 PMAP1changed++; 803 } else 804#ifdef SMP 805 if (PMAP1cpu != PCPU_GET(cpuid)) { 806 PMAP1cpu = PCPU_GET(cpuid); 807 invlcaddr(PADDR1); 808 PMAP1changedcpu++; 809 } else 810#endif 811 PMAP1unchanged++; 812 return (PADDR1 + (i386_btop(va) & (NPTEPG - 1))); 813 } 814 return (0); 815} 816 817/* 818 * Routine: pmap_extract 819 * Function: 820 * Extract the physical page address associated 821 * with the given map/virtual_address pair. 822 */ 823vm_paddr_t 824pmap_extract(pmap_t pmap, vm_offset_t va) 825{ 826 vm_paddr_t rtval; 827 pt_entry_t *pte; 828 pd_entry_t pde; 829 830 rtval = 0; 831 if (pmap == NULL) 832 return (rtval); 833 PMAP_LOCK(pmap); 834 pde = pmap->pm_pdir[va >> PDRSHIFT]; 835 if (pde != 0) { 836 if ((pde & PG_PS) != 0) { 837 rtval = (pde & ~PDRMASK) | (va & PDRMASK); 838 PMAP_UNLOCK(pmap); 839 return rtval; 840 } 841 pte = pmap_pte(pmap, va); 842 rtval = (*pte & PG_FRAME) | (va & PAGE_MASK); 843 } 844 PMAP_UNLOCK(pmap); 845 return (rtval); 846} 847 848/* 849 * Routine: pmap_extract_and_hold 850 * Function: 851 * Atomically extract and hold the physical page 852 * with the given pmap and virtual address pair 853 * if that mapping permits the given protection. 854 */ 855vm_page_t 856pmap_extract_and_hold(pmap_t pmap, vm_offset_t va, vm_prot_t prot) 857{ 858 pd_entry_t pde; 859 pt_entry_t pte; 860 vm_page_t m; 861 862 m = NULL; 863 if (pmap == NULL) 864 return (m); 865 vm_page_lock_queues(); 866 PMAP_LOCK(pmap); 867 pde = *pmap_pde(pmap, va); 868 if (pde != 0) { 869 if (pde & PG_PS) { 870 if ((pde & PG_RW) || (prot & VM_PROT_WRITE) == 0) { 871 m = PHYS_TO_VM_PAGE((pde & ~PDRMASK) | 872 (va & PDRMASK)); 873 vm_page_hold(m); 874 } 875 } else { 876 sched_pin(); 877 pte = *pmap_pte_quick(pmap, va); 878 if (pte != 0 && 879 ((pte & PG_RW) || (prot & VM_PROT_WRITE) == 0)) { 880 m = PHYS_TO_VM_PAGE(pte & PG_FRAME); 881 vm_page_hold(m); 882 } 883 sched_unpin(); 884 } 885 } 886 vm_page_unlock_queues(); 887 PMAP_UNLOCK(pmap); 888 return (m); 889} 890 891/*************************************************** 892 * Low level mapping routines..... 893 ***************************************************/ 894 895/* 896 * Add a wired page to the kva. 897 * Note: not SMP coherent. 898 */ 899PMAP_INLINE void 900pmap_kenter(vm_offset_t va, vm_paddr_t pa) 901{ 902 pt_entry_t *pte; 903 904 pte = vtopte(va); 905 pte_store(pte, pa | PG_RW | PG_V | pgeflag); 906} 907 908/* 909 * Remove a page from the kernel pagetables. 910 * Note: not SMP coherent. 911 */ 912PMAP_INLINE void 913pmap_kremove(vm_offset_t va) 914{ 915 pt_entry_t *pte; 916 917 pte = vtopte(va); 918 pte_clear(pte); 919} 920 921/* 922 * Used to map a range of physical addresses into kernel 923 * virtual address space. 924 * 925 * The value passed in '*virt' is a suggested virtual address for 926 * the mapping. Architectures which can support a direct-mapped 927 * physical to virtual region can return the appropriate address 928 * within that region, leaving '*virt' unchanged. Other 929 * architectures should map the pages starting at '*virt' and 930 * update '*virt' with the first usable address after the mapped 931 * region. 932 */ 933vm_offset_t 934pmap_map(vm_offset_t *virt, vm_paddr_t start, vm_paddr_t end, int prot) 935{ 936 vm_offset_t va, sva; 937 938 va = sva = *virt; 939 while (start < end) { 940 pmap_kenter(va, start); 941 va += PAGE_SIZE; 942 start += PAGE_SIZE; 943 } 944 pmap_invalidate_range(kernel_pmap, sva, va); 945 *virt = va; 946 return (sva); 947} 948 949 950/* 951 * Add a list of wired pages to the kva 952 * this routine is only used for temporary 953 * kernel mappings that do not need to have 954 * page modification or references recorded. 955 * Note that old mappings are simply written 956 * over. The page *must* be wired. 957 * Note: SMP coherent. Uses a ranged shootdown IPI. 958 */ 959void 960pmap_qenter(vm_offset_t sva, vm_page_t *m, int count) 961{ 962 vm_offset_t va; 963 964 va = sva; 965 while (count-- > 0) { 966 pmap_kenter(va, VM_PAGE_TO_PHYS(*m)); 967 va += PAGE_SIZE; 968 m++; 969 } 970 pmap_invalidate_range(kernel_pmap, sva, va); 971} 972 973/* 974 * This routine tears out page mappings from the 975 * kernel -- it is meant only for temporary mappings. 976 * Note: SMP coherent. Uses a ranged shootdown IPI. 977 */ 978void 979pmap_qremove(vm_offset_t sva, int count) 980{ 981 vm_offset_t va; 982 983 va = sva; 984 while (count-- > 0) { 985 pmap_kremove(va); 986 va += PAGE_SIZE; 987 } 988 pmap_invalidate_range(kernel_pmap, sva, va); 989} 990 991/*************************************************** 992 * Page table page management routines..... 993 ***************************************************/ 994 995/* 996 * This routine unholds page table pages, and if the hold count 997 * drops to zero, then it decrements the wire count. 998 */ 999static int 1000_pmap_unwire_pte_hold(pmap_t pmap, vm_page_t m) 1001{ 1002 1003 while (vm_page_sleep_if_busy(m, FALSE, "pmuwpt")) 1004 vm_page_lock_queues(); 1005 1006 if (m->hold_count == 0) { 1007 vm_offset_t pteva; 1008 /* 1009 * unmap the page table page 1010 */ 1011 pmap->pm_pdir[m->pindex] = 0; 1012 --pmap->pm_stats.resident_count; 1013 /* 1014 * We never unwire a kernel page table page, making a 1015 * check for the kernel_pmap unnecessary. 1016 */ 1017 if ((pmap->pm_pdir[PTDPTDI] & PG_FRAME) == (PTDpde[0] & PG_FRAME)) { 1018 /* 1019 * Do an invltlb to make the invalidated mapping 1020 * take effect immediately. 1021 */ 1022 pteva = VM_MAXUSER_ADDRESS + i386_ptob(m->pindex); 1023 pmap_invalidate_page(pmap, pteva); 1024 } 1025 1026 /* 1027 * If the page is finally unwired, simply free it. 1028 */ 1029 --m->wire_count; 1030 if (m->wire_count == 0) { 1031 vm_page_busy(m); 1032 vm_page_free_zero(m); 1033 atomic_subtract_int(&cnt.v_wire_count, 1); 1034 } 1035 return 1; 1036 } 1037 return 0; 1038} 1039 1040static PMAP_INLINE int 1041pmap_unwire_pte_hold(pmap_t pmap, vm_page_t m) 1042{ 1043 vm_page_unhold(m); 1044 if (m->hold_count == 0) 1045 return _pmap_unwire_pte_hold(pmap, m); 1046 else 1047 return 0; 1048} 1049 1050/* 1051 * After removing a page table entry, this routine is used to 1052 * conditionally free the page, and manage the hold/wire counts. 1053 */ 1054static int 1055pmap_unuse_pt(pmap_t pmap, vm_offset_t va) 1056{ 1057 pd_entry_t ptepde; 1058 vm_page_t mpte; 1059 1060 if (va >= VM_MAXUSER_ADDRESS) 1061 return 0; 1062 ptepde = *pmap_pde(pmap, va); 1063 mpte = PHYS_TO_VM_PAGE(ptepde & PG_FRAME); 1064 return pmap_unwire_pte_hold(pmap, mpte); 1065} 1066 1067void 1068pmap_pinit0(pmap) 1069 struct pmap *pmap; 1070{ 1071 1072 PMAP_LOCK_INIT(pmap); 1073 pmap->pm_pdir = (pd_entry_t *)(KERNBASE + (vm_offset_t)IdlePTD); 1074#ifdef PAE 1075 pmap->pm_pdpt = (pdpt_entry_t *)(KERNBASE + (vm_offset_t)IdlePDPT); 1076#endif 1077 pmap->pm_active = 0; 1078 PCPU_SET(curpmap, pmap); 1079 TAILQ_INIT(&pmap->pm_pvlist); 1080 bzero(&pmap->pm_stats, sizeof pmap->pm_stats); 1081 mtx_lock_spin(&allpmaps_lock); 1082 LIST_INSERT_HEAD(&allpmaps, pmap, pm_list); 1083 mtx_unlock_spin(&allpmaps_lock); 1084} 1085 1086/* 1087 * Initialize a preallocated and zeroed pmap structure, 1088 * such as one in a vmspace structure. 1089 */ 1090void 1091pmap_pinit(pmap) 1092 register struct pmap *pmap; 1093{ 1094 vm_page_t m, ptdpg[NPGPTD]; 1095 vm_paddr_t pa; 1096 static int color; 1097 int i; 1098 1099 PMAP_LOCK_INIT(pmap); 1100 1101 /* 1102 * No need to allocate page table space yet but we do need a valid 1103 * page directory table. 1104 */ 1105 if (pmap->pm_pdir == NULL) { 1106 pmap->pm_pdir = (pd_entry_t *)kmem_alloc_nofault(kernel_map, 1107 NBPTD); 1108#ifdef PAE 1109 pmap->pm_pdpt = uma_zalloc(pdptzone, M_WAITOK | M_ZERO); 1110 KASSERT(((vm_offset_t)pmap->pm_pdpt & 1111 ((NPGPTD * sizeof(pdpt_entry_t)) - 1)) == 0, 1112 ("pmap_pinit: pdpt misaligned")); 1113 KASSERT(pmap_kextract((vm_offset_t)pmap->pm_pdpt) < (4ULL<<30), 1114 ("pmap_pinit: pdpt above 4g")); 1115#endif 1116 } 1117 1118 /* 1119 * allocate the page directory page(s) 1120 */ 1121 for (i = 0; i < NPGPTD;) { 1122 m = vm_page_alloc(NULL, color++, 1123 VM_ALLOC_NORMAL | VM_ALLOC_NOOBJ | VM_ALLOC_WIRED | 1124 VM_ALLOC_ZERO); 1125 if (m == NULL) 1126 VM_WAIT; 1127 else { 1128 ptdpg[i++] = m; 1129 } 1130 } 1131 1132 pmap_qenter((vm_offset_t)pmap->pm_pdir, ptdpg, NPGPTD); 1133 1134 for (i = 0; i < NPGPTD; i++) { 1135 if ((ptdpg[i]->flags & PG_ZERO) == 0) 1136 bzero(pmap->pm_pdir + (i * NPDEPG), PAGE_SIZE); 1137 } 1138 1139 mtx_lock_spin(&allpmaps_lock); 1140 LIST_INSERT_HEAD(&allpmaps, pmap, pm_list); 1141 mtx_unlock_spin(&allpmaps_lock); 1142 /* Wire in kernel global address entries. */ 1143 /* XXX copies current process, does not fill in MPPTDI */ 1144 bcopy(PTD + KPTDI, pmap->pm_pdir + KPTDI, nkpt * sizeof(pd_entry_t)); 1145#ifdef SMP 1146 pmap->pm_pdir[MPPTDI] = PTD[MPPTDI]; 1147#endif 1148 1149 /* install self-referential address mapping entry(s) */ 1150 for (i = 0; i < NPGPTD; i++) { 1151 pa = VM_PAGE_TO_PHYS(ptdpg[i]); 1152 pmap->pm_pdir[PTDPTDI + i] = pa | PG_V | PG_RW | PG_A | PG_M; 1153#ifdef PAE 1154 pmap->pm_pdpt[i] = pa | PG_V; 1155#endif 1156 } 1157 1158 pmap->pm_active = 0; 1159 TAILQ_INIT(&pmap->pm_pvlist); 1160 bzero(&pmap->pm_stats, sizeof pmap->pm_stats); 1161} 1162 1163/* 1164 * this routine is called if the page table page is not 1165 * mapped correctly. 1166 */ 1167static vm_page_t 1168_pmap_allocpte(pmap, ptepindex) 1169 pmap_t pmap; 1170 unsigned ptepindex; 1171{ 1172 vm_paddr_t ptepa; 1173 vm_page_t m; 1174 1175 /* 1176 * Allocate a page table page. 1177 */ 1178 if ((m = vm_page_alloc(NULL, ptepindex, VM_ALLOC_NOOBJ | 1179 VM_ALLOC_WIRED | VM_ALLOC_ZERO)) == NULL) { 1180 VM_WAIT; 1181 /* 1182 * Indicate the need to retry. While waiting, the page table 1183 * page may have been allocated. 1184 */ 1185 return (NULL); 1186 } 1187 if ((m->flags & PG_ZERO) == 0) 1188 pmap_zero_page(m); 1189 1190 KASSERT(m->queue == PQ_NONE, 1191 ("_pmap_allocpte: %p->queue != PQ_NONE", m)); 1192 1193 /* 1194 * Increment the hold count for the page table page 1195 * (denoting a new mapping.) 1196 */ 1197 m->hold_count++; 1198 1199 /* 1200 * Map the pagetable page into the process address space, if 1201 * it isn't already there. 1202 */ 1203 1204 pmap->pm_stats.resident_count++; 1205 1206 ptepa = VM_PAGE_TO_PHYS(m); 1207 pmap->pm_pdir[ptepindex] = 1208 (pd_entry_t) (ptepa | PG_U | PG_RW | PG_V | PG_A | PG_M); 1209 1210 return m; 1211} 1212 1213static vm_page_t 1214pmap_allocpte(pmap_t pmap, vm_offset_t va) 1215{ 1216 unsigned ptepindex; 1217 pd_entry_t ptepa; 1218 vm_page_t m; 1219 1220 /* 1221 * Calculate pagetable page index 1222 */ 1223 ptepindex = va >> PDRSHIFT; 1224retry: 1225 /* 1226 * Get the page directory entry 1227 */ 1228 ptepa = pmap->pm_pdir[ptepindex]; 1229 1230 /* 1231 * This supports switching from a 4MB page to a 1232 * normal 4K page. 1233 */ 1234 if (ptepa & PG_PS) { 1235 pmap->pm_pdir[ptepindex] = 0; 1236 ptepa = 0; 1237 pmap_invalidate_all(kernel_pmap); 1238 } 1239 1240 /* 1241 * If the page table page is mapped, we just increment the 1242 * hold count, and activate it. 1243 */ 1244 if (ptepa) { 1245 m = PHYS_TO_VM_PAGE(ptepa); 1246 m->hold_count++; 1247 } else { 1248 /* 1249 * Here if the pte page isn't mapped, or if it has 1250 * been deallocated. 1251 */ 1252 m = _pmap_allocpte(pmap, ptepindex); 1253 if (m == NULL) 1254 goto retry; 1255 } 1256 return (m); 1257} 1258 1259 1260/*************************************************** 1261* Pmap allocation/deallocation routines. 1262 ***************************************************/ 1263 1264#ifdef SMP 1265/* 1266 * Deal with a SMP shootdown of other users of the pmap that we are 1267 * trying to dispose of. This can be a bit hairy. 1268 */ 1269static u_int *lazymask; 1270static u_int lazyptd; 1271static volatile u_int lazywait; 1272 1273void pmap_lazyfix_action(void); 1274 1275void 1276pmap_lazyfix_action(void) 1277{ 1278 u_int mymask = PCPU_GET(cpumask); 1279 1280 if (rcr3() == lazyptd) 1281 load_cr3(PCPU_GET(curpcb)->pcb_cr3); 1282 atomic_clear_int(lazymask, mymask); 1283 atomic_store_rel_int(&lazywait, 1); 1284} 1285 1286static void 1287pmap_lazyfix_self(u_int mymask) 1288{ 1289 1290 if (rcr3() == lazyptd) 1291 load_cr3(PCPU_GET(curpcb)->pcb_cr3); 1292 atomic_clear_int(lazymask, mymask); 1293} 1294 1295 1296static void 1297pmap_lazyfix(pmap_t pmap) 1298{ 1299 u_int mymask = PCPU_GET(cpumask); 1300 u_int mask; 1301 register u_int spins; 1302 1303 while ((mask = pmap->pm_active) != 0) { 1304 spins = 50000000; 1305 mask = mask & -mask; /* Find least significant set bit */ 1306 mtx_lock_spin(&lazypmap_lock); 1307#ifdef PAE 1308 lazyptd = vtophys(pmap->pm_pdpt); 1309#else 1310 lazyptd = vtophys(pmap->pm_pdir); 1311#endif 1312 if (mask == mymask) { 1313 lazymask = &pmap->pm_active; 1314 pmap_lazyfix_self(mymask); 1315 } else { 1316 atomic_store_rel_int((u_int *)&lazymask, 1317 (u_int)&pmap->pm_active); 1318 atomic_store_rel_int(&lazywait, 0); 1319 ipi_selected(mask, IPI_LAZYPMAP); 1320 while (lazywait == 0) { 1321 ia32_pause(); 1322 if (--spins == 0) 1323 break; 1324 } 1325 } 1326 mtx_unlock_spin(&lazypmap_lock); 1327 if (spins == 0) 1328 printf("pmap_lazyfix: spun for 50000000\n"); 1329 } 1330} 1331 1332#else /* SMP */ 1333 1334/* 1335 * Cleaning up on uniprocessor is easy. For various reasons, we're 1336 * unlikely to have to even execute this code, including the fact 1337 * that the cleanup is deferred until the parent does a wait(2), which 1338 * means that another userland process has run. 1339 */ 1340static void 1341pmap_lazyfix(pmap_t pmap) 1342{ 1343 u_int cr3; 1344 1345 cr3 = vtophys(pmap->pm_pdir); 1346 if (cr3 == rcr3()) { 1347 load_cr3(PCPU_GET(curpcb)->pcb_cr3); 1348 pmap->pm_active &= ~(PCPU_GET(cpumask)); 1349 } 1350} 1351#endif /* SMP */ 1352 1353/* 1354 * Release any resources held by the given physical map. 1355 * Called when a pmap initialized by pmap_pinit is being released. 1356 * Should only be called if the map contains no valid mappings. 1357 */ 1358void 1359pmap_release(pmap_t pmap) 1360{ 1361 vm_page_t m, ptdpg[NPGPTD]; 1362 int i; 1363 1364 KASSERT(pmap->pm_stats.resident_count == 0, 1365 ("pmap_release: pmap resident count %ld != 0", 1366 pmap->pm_stats.resident_count)); 1367 1368 pmap_lazyfix(pmap); 1369 mtx_lock_spin(&allpmaps_lock); 1370 LIST_REMOVE(pmap, pm_list); 1371 mtx_unlock_spin(&allpmaps_lock); 1372 1373 for (i = 0; i < NPGPTD; i++) 1374 ptdpg[i] = PHYS_TO_VM_PAGE(pmap->pm_pdir[PTDPTDI + i]); 1375 1376 bzero(pmap->pm_pdir + PTDPTDI, (nkpt + NPGPTD) * 1377 sizeof(*pmap->pm_pdir)); 1378#ifdef SMP 1379 pmap->pm_pdir[MPPTDI] = 0; 1380#endif 1381 1382 pmap_qremove((vm_offset_t)pmap->pm_pdir, NPGPTD); 1383 1384 vm_page_lock_queues(); 1385 for (i = 0; i < NPGPTD; i++) { 1386 m = ptdpg[i]; 1387#ifdef PAE 1388 KASSERT(VM_PAGE_TO_PHYS(m) == (pmap->pm_pdpt[i] & PG_FRAME), 1389 ("pmap_release: got wrong ptd page")); 1390#endif 1391 m->wire_count--; 1392 atomic_subtract_int(&cnt.v_wire_count, 1); 1393 vm_page_free_zero(m); 1394 } 1395 vm_page_unlock_queues(); 1396 PMAP_LOCK_DESTROY(pmap); 1397} 1398 1399static int 1400kvm_size(SYSCTL_HANDLER_ARGS) 1401{ 1402 unsigned long ksize = VM_MAX_KERNEL_ADDRESS - KERNBASE; 1403 1404 return sysctl_handle_long(oidp, &ksize, 0, req); 1405} 1406SYSCTL_PROC(_vm, OID_AUTO, kvm_size, CTLTYPE_LONG|CTLFLAG_RD, 1407 0, 0, kvm_size, "IU", "Size of KVM"); 1408 1409static int 1410kvm_free(SYSCTL_HANDLER_ARGS) 1411{ 1412 unsigned long kfree = VM_MAX_KERNEL_ADDRESS - kernel_vm_end; 1413 1414 return sysctl_handle_long(oidp, &kfree, 0, req); 1415} 1416SYSCTL_PROC(_vm, OID_AUTO, kvm_free, CTLTYPE_LONG|CTLFLAG_RD, 1417 0, 0, kvm_free, "IU", "Amount of KVM free"); 1418 1419/* 1420 * grow the number of kernel page table entries, if needed 1421 */ 1422void 1423pmap_growkernel(vm_offset_t addr) 1424{ 1425 struct pmap *pmap; 1426 vm_paddr_t ptppaddr; 1427 vm_page_t nkpg; 1428 pd_entry_t newpdir; 1429 pt_entry_t *pde; 1430 1431 mtx_assert(&kernel_map->system_mtx, MA_OWNED); 1432 if (kernel_vm_end == 0) { 1433 kernel_vm_end = KERNBASE; 1434 nkpt = 0; 1435 while (pdir_pde(PTD, kernel_vm_end)) { 1436 kernel_vm_end = (kernel_vm_end + PAGE_SIZE * NPTEPG) & ~(PAGE_SIZE * NPTEPG - 1); 1437 nkpt++; 1438 } 1439 } 1440 addr = roundup2(addr, PAGE_SIZE * NPTEPG); 1441 while (kernel_vm_end < addr) { 1442 if (pdir_pde(PTD, kernel_vm_end)) { 1443 kernel_vm_end = (kernel_vm_end + PAGE_SIZE * NPTEPG) & ~(PAGE_SIZE * NPTEPG - 1); 1444 continue; 1445 } 1446 1447 /* 1448 * This index is bogus, but out of the way 1449 */ 1450 nkpg = vm_page_alloc(NULL, nkpt, 1451 VM_ALLOC_NOOBJ | VM_ALLOC_SYSTEM | VM_ALLOC_WIRED); 1452 if (!nkpg) 1453 panic("pmap_growkernel: no memory to grow kernel"); 1454 1455 nkpt++; 1456 1457 pmap_zero_page(nkpg); 1458 ptppaddr = VM_PAGE_TO_PHYS(nkpg); 1459 newpdir = (pd_entry_t) (ptppaddr | PG_V | PG_RW | PG_A | PG_M); 1460 pdir_pde(PTD, kernel_vm_end) = newpdir; 1461 1462 mtx_lock_spin(&allpmaps_lock); 1463 LIST_FOREACH(pmap, &allpmaps, pm_list) { 1464 pde = pmap_pde(pmap, kernel_vm_end); 1465 pde_store(pde, newpdir); 1466 } 1467 mtx_unlock_spin(&allpmaps_lock); 1468 kernel_vm_end = (kernel_vm_end + PAGE_SIZE * NPTEPG) & ~(PAGE_SIZE * NPTEPG - 1); 1469 } 1470} 1471 1472 1473/*************************************************** 1474 * page management routines. 1475 ***************************************************/ 1476 1477/* 1478 * free the pv_entry back to the free list 1479 */ 1480static PMAP_INLINE void 1481free_pv_entry(pv_entry_t pv) 1482{ 1483 pv_entry_count--; 1484 uma_zfree(pvzone, pv); 1485} 1486 1487/* 1488 * get a new pv_entry, allocating a block from the system 1489 * when needed. 1490 * the memory allocation is performed bypassing the malloc code 1491 * because of the possibility of allocations at interrupt time. 1492 */ 1493static pv_entry_t 1494get_pv_entry(void) 1495{ 1496 pv_entry_count++; 1497 if (pv_entry_high_water && 1498 (pv_entry_count > pv_entry_high_water) && 1499 (pmap_pagedaemon_waken == 0)) { 1500 pmap_pagedaemon_waken = 1; 1501 wakeup (&vm_pages_needed); 1502 } 1503 return uma_zalloc(pvzone, M_NOWAIT); 1504} 1505 1506 1507static int 1508pmap_remove_entry(pmap_t pmap, vm_page_t m, vm_offset_t va) 1509{ 1510 pv_entry_t pv; 1511 int rtval; 1512 1513 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 1514 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 1515 if (m->md.pv_list_count < pmap->pm_stats.resident_count) { 1516 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 1517 if (pmap == pv->pv_pmap && va == pv->pv_va) 1518 break; 1519 } 1520 } else { 1521 TAILQ_FOREACH(pv, &pmap->pm_pvlist, pv_plist) { 1522 if (va == pv->pv_va) 1523 break; 1524 } 1525 } 1526 1527 rtval = 0; 1528 if (pv) { 1529 rtval = pmap_unuse_pt(pmap, va); 1530 TAILQ_REMOVE(&m->md.pv_list, pv, pv_list); 1531 m->md.pv_list_count--; 1532 if (TAILQ_FIRST(&m->md.pv_list) == NULL) 1533 vm_page_flag_clear(m, PG_WRITEABLE); 1534 1535 TAILQ_REMOVE(&pmap->pm_pvlist, pv, pv_plist); 1536 free_pv_entry(pv); 1537 } 1538 1539 return rtval; 1540} 1541 1542/* 1543 * Create a pv entry for page at pa for 1544 * (pmap, va). 1545 */ 1546static void 1547pmap_insert_entry(pmap_t pmap, vm_offset_t va, vm_page_t m) 1548{ 1549 pv_entry_t pv; 1550 1551 pv = get_pv_entry(); 1552 pv->pv_va = va; 1553 pv->pv_pmap = pmap; 1554 1555 vm_page_lock_queues(); 1556 TAILQ_INSERT_TAIL(&pmap->pm_pvlist, pv, pv_plist); 1557 TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list); 1558 m->md.pv_list_count++; 1559 vm_page_unlock_queues(); 1560} 1561 1562/* 1563 * pmap_remove_pte: do the things to unmap a page in a process 1564 */ 1565static int 1566pmap_remove_pte(pmap_t pmap, pt_entry_t *ptq, vm_offset_t va) 1567{ 1568 pt_entry_t oldpte; 1569 vm_page_t m; 1570 1571 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 1572 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 1573 oldpte = pte_load_clear(ptq); 1574 if (oldpte & PG_W) 1575 pmap->pm_stats.wired_count -= 1; 1576 /* 1577 * Machines that don't support invlpg, also don't support 1578 * PG_G. 1579 */ 1580 if (oldpte & PG_G) 1581 pmap_invalidate_page(kernel_pmap, va); 1582 pmap->pm_stats.resident_count -= 1; 1583 if (oldpte & PG_MANAGED) { 1584 m = PHYS_TO_VM_PAGE(oldpte); 1585 if (oldpte & PG_M) { 1586#if defined(PMAP_DIAGNOSTIC) 1587 if (pmap_nw_modified((pt_entry_t) oldpte)) { 1588 printf( 1589 "pmap_remove: modified page not writable: va: 0x%x, pte: 0x%x\n", 1590 va, oldpte); 1591 } 1592#endif 1593 if (pmap_track_modified(va)) 1594 vm_page_dirty(m); 1595 } 1596 if (oldpte & PG_A) 1597 vm_page_flag_set(m, PG_REFERENCED); 1598 return pmap_remove_entry(pmap, m, va); 1599 } else { 1600 return pmap_unuse_pt(pmap, va); 1601 } 1602} 1603 1604/* 1605 * Remove a single page from a process address space 1606 */ 1607static void 1608pmap_remove_page(pmap_t pmap, vm_offset_t va) 1609{ 1610 pt_entry_t *pte; 1611 1612 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 1613 KASSERT(curthread->td_pinned > 0, ("curthread not pinned")); 1614 PMAP_LOCK_ASSERT(pmap, MA_OWNED); 1615 if ((pte = pmap_pte_quick(pmap, va)) == NULL || *pte == 0) 1616 return; 1617 pmap_remove_pte(pmap, pte, va); 1618 pmap_invalidate_page(pmap, va); 1619} 1620 1621/* 1622 * Remove the given range of addresses from the specified map. 1623 * 1624 * It is assumed that the start and end are properly 1625 * rounded to the page size. 1626 */ 1627void 1628pmap_remove(pmap_t pmap, vm_offset_t sva, vm_offset_t eva) 1629{ 1630 vm_offset_t pdnxt; 1631 pd_entry_t ptpaddr; 1632 pt_entry_t *pte; 1633 int anyvalid; 1634 1635 if (pmap == NULL) 1636 return; 1637 1638 /* 1639 * Perform an unsynchronized read. This is, however, safe. 1640 */ 1641 if (pmap->pm_stats.resident_count == 0) 1642 return; 1643 1644 vm_page_lock_queues(); 1645 sched_pin(); 1646 PMAP_LOCK(pmap); 1647 1648 /* 1649 * special handling of removing one page. a very 1650 * common operation and easy to short circuit some 1651 * code. 1652 */ 1653 if ((sva + PAGE_SIZE == eva) && 1654 ((pmap->pm_pdir[(sva >> PDRSHIFT)] & PG_PS) == 0)) { 1655 pmap_remove_page(pmap, sva); 1656 goto out; 1657 } 1658 1659 anyvalid = 0; 1660 1661 for (; sva < eva; sva = pdnxt) { 1662 unsigned pdirindex; 1663 1664 /* 1665 * Calculate index for next page table. 1666 */ 1667 pdnxt = (sva + NBPDR) & ~PDRMASK; 1668 if (pmap->pm_stats.resident_count == 0) 1669 break; 1670 1671 pdirindex = sva >> PDRSHIFT; 1672 ptpaddr = pmap->pm_pdir[pdirindex]; 1673 1674 /* 1675 * Weed out invalid mappings. Note: we assume that the page 1676 * directory table is always allocated, and in kernel virtual. 1677 */ 1678 if (ptpaddr == 0) 1679 continue; 1680 1681 /* 1682 * Check for large page. 1683 */ 1684 if ((ptpaddr & PG_PS) != 0) { 1685 pmap->pm_pdir[pdirindex] = 0; 1686 pmap->pm_stats.resident_count -= NBPDR / PAGE_SIZE; 1687 anyvalid = 1; 1688 continue; 1689 } 1690 1691 /* 1692 * Limit our scan to either the end of the va represented 1693 * by the current page table page, or to the end of the 1694 * range being removed. 1695 */ 1696 if (pdnxt > eva) 1697 pdnxt = eva; 1698 1699 for (; sva != pdnxt; sva += PAGE_SIZE) { 1700 if ((pte = pmap_pte_quick(pmap, sva)) == NULL || 1701 *pte == 0) 1702 continue; 1703 anyvalid = 1; 1704 if (pmap_remove_pte(pmap, pte, sva)) 1705 break; 1706 } 1707 } 1708 1709 if (anyvalid) 1710 pmap_invalidate_all(pmap); 1711out: 1712 sched_unpin(); 1713 vm_page_unlock_queues(); 1714 PMAP_UNLOCK(pmap); 1715} 1716 1717/* 1718 * Routine: pmap_remove_all 1719 * Function: 1720 * Removes this physical page from 1721 * all physical maps in which it resides. 1722 * Reflects back modify bits to the pager. 1723 * 1724 * Notes: 1725 * Original versions of this routine were very 1726 * inefficient because they iteratively called 1727 * pmap_remove (slow...) 1728 */ 1729 1730void 1731pmap_remove_all(vm_page_t m) 1732{ 1733 register pv_entry_t pv; 1734 pt_entry_t *pte, tpte; 1735 1736#if defined(PMAP_DIAGNOSTIC) 1737 /* 1738 * XXX This makes pmap_remove_all() illegal for non-managed pages! 1739 */ 1740 if (!pmap_initialized || (m->flags & PG_FICTITIOUS)) { 1741 panic("pmap_remove_all: illegal for unmanaged page, va: 0x%x", 1742 VM_PAGE_TO_PHYS(m)); 1743 } 1744#endif 1745 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 1746 sched_pin(); 1747 while ((pv = TAILQ_FIRST(&m->md.pv_list)) != NULL) { 1748 PMAP_LOCK(pv->pv_pmap); 1749 pv->pv_pmap->pm_stats.resident_count--; 1750 pte = pmap_pte_quick(pv->pv_pmap, pv->pv_va); 1751 tpte = pte_load_clear(pte); 1752 if (tpte & PG_W) 1753 pv->pv_pmap->pm_stats.wired_count--; 1754 if (tpte & PG_A) 1755 vm_page_flag_set(m, PG_REFERENCED); 1756 1757 /* 1758 * Update the vm_page_t clean and reference bits. 1759 */ 1760 if (tpte & PG_M) { 1761#if defined(PMAP_DIAGNOSTIC) 1762 if (pmap_nw_modified((pt_entry_t) tpte)) { 1763 printf( 1764 "pmap_remove_all: modified page not writable: va: 0x%x, pte: 0x%x\n", 1765 pv->pv_va, tpte); 1766 } 1767#endif 1768 if (pmap_track_modified(pv->pv_va)) 1769 vm_page_dirty(m); 1770 } 1771 pmap_invalidate_page(pv->pv_pmap, pv->pv_va); 1772 TAILQ_REMOVE(&pv->pv_pmap->pm_pvlist, pv, pv_plist); 1773 TAILQ_REMOVE(&m->md.pv_list, pv, pv_list); 1774 m->md.pv_list_count--; 1775 pmap_unuse_pt(pv->pv_pmap, pv->pv_va); 1776 PMAP_UNLOCK(pv->pv_pmap); 1777 free_pv_entry(pv); 1778 } 1779 vm_page_flag_clear(m, PG_WRITEABLE); 1780 sched_unpin(); 1781} 1782 1783/* 1784 * Set the physical protection on the 1785 * specified range of this map as requested. 1786 */ 1787void 1788pmap_protect(pmap_t pmap, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot) 1789{ 1790 vm_offset_t pdnxt; 1791 pd_entry_t ptpaddr; 1792 int anychanged; 1793 1794 if (pmap == NULL) 1795 return; 1796 1797 if ((prot & VM_PROT_READ) == VM_PROT_NONE) { 1798 pmap_remove(pmap, sva, eva); 1799 return; 1800 } 1801 1802 if (prot & VM_PROT_WRITE) 1803 return; 1804 1805 anychanged = 0; 1806 1807 vm_page_lock_queues(); 1808 sched_pin(); 1809 PMAP_LOCK(pmap); 1810 for (; sva < eva; sva = pdnxt) { 1811 unsigned pdirindex; 1812 1813 pdnxt = (sva + NBPDR) & ~PDRMASK; 1814 1815 pdirindex = sva >> PDRSHIFT; 1816 ptpaddr = pmap->pm_pdir[pdirindex]; 1817 1818 /* 1819 * Weed out invalid mappings. Note: we assume that the page 1820 * directory table is always allocated, and in kernel virtual. 1821 */ 1822 if (ptpaddr == 0) 1823 continue; 1824 1825 /* 1826 * Check for large page. 1827 */ 1828 if ((ptpaddr & PG_PS) != 0) { 1829 pmap->pm_pdir[pdirindex] &= ~(PG_M|PG_RW); 1830 pmap->pm_stats.resident_count -= NBPDR / PAGE_SIZE; 1831 anychanged = 1; 1832 continue; 1833 } 1834 1835 if (pdnxt > eva) 1836 pdnxt = eva; 1837 1838 for (; sva != pdnxt; sva += PAGE_SIZE) { 1839 pt_entry_t pbits; 1840 pt_entry_t *pte; 1841 vm_page_t m; 1842 1843 if ((pte = pmap_pte_quick(pmap, sva)) == NULL) 1844 continue; 1845 pbits = *pte; 1846 if (pbits & PG_MANAGED) { 1847 m = NULL; 1848 if (pbits & PG_A) { 1849 m = PHYS_TO_VM_PAGE(pbits); 1850 vm_page_flag_set(m, PG_REFERENCED); 1851 pbits &= ~PG_A; 1852 } 1853 if ((pbits & PG_M) != 0 && 1854 pmap_track_modified(sva)) { 1855 if (m == NULL) 1856 m = PHYS_TO_VM_PAGE(pbits); 1857 vm_page_dirty(m); 1858 pbits &= ~PG_M; 1859 } 1860 } 1861 1862 pbits &= ~PG_RW; 1863 1864 if (pbits != *pte) { 1865 pte_store(pte, pbits); 1866 anychanged = 1; 1867 } 1868 } 1869 } 1870 if (anychanged) 1871 pmap_invalidate_all(pmap); 1872 sched_unpin(); 1873 vm_page_unlock_queues(); 1874 PMAP_UNLOCK(pmap); 1875} 1876 1877/* 1878 * Insert the given physical page (p) at 1879 * the specified virtual address (v) in the 1880 * target physical map with the protection requested. 1881 * 1882 * If specified, the page will be wired down, meaning 1883 * that the related pte can not be reclaimed. 1884 * 1885 * NB: This is the only routine which MAY NOT lazy-evaluate 1886 * or lose information. That is, this routine must actually 1887 * insert this page into the given map NOW. 1888 */ 1889void 1890pmap_enter(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot, 1891 boolean_t wired) 1892{ 1893 vm_paddr_t pa; 1894 register pt_entry_t *pte; 1895 vm_paddr_t opa; 1896 pt_entry_t origpte, newpte; 1897 vm_page_t mpte; 1898 1899 if (pmap == NULL) 1900 return; 1901 1902 va &= PG_FRAME; 1903#ifdef PMAP_DIAGNOSTIC 1904 if (va > VM_MAX_KERNEL_ADDRESS) 1905 panic("pmap_enter: toobig"); 1906 if ((va >= UPT_MIN_ADDRESS) && (va < UPT_MAX_ADDRESS)) 1907 panic("pmap_enter: invalid to pmap_enter page table pages (va: 0x%x)", va); 1908#endif 1909 1910 mpte = NULL; 1911 /* 1912 * In the case that a page table page is not 1913 * resident, we are creating it here. 1914 */ 1915 if (va < VM_MAXUSER_ADDRESS) { 1916 mpte = pmap_allocpte(pmap, va); 1917 } 1918#if 0 && defined(PMAP_DIAGNOSTIC) 1919 else { 1920 pd_entry_t *pdeaddr = pmap_pde(pmap, va); 1921 origpte = *pdeaddr; 1922 if ((origpte & PG_V) == 0) { 1923 panic("pmap_enter: invalid kernel page table page, pdir=%p, pde=%p, va=%p\n", 1924 pmap->pm_pdir[PTDPTDI], origpte, va); 1925 } 1926 } 1927#endif 1928 1929 pte = pmap_pte(pmap, va); 1930 1931 /* 1932 * Page Directory table entry not valid, we need a new PT page 1933 */ 1934 if (pte == NULL) { 1935 panic("pmap_enter: invalid page directory pdir=%#jx, va=%#x\n", 1936 (uintmax_t)pmap->pm_pdir[PTDPTDI], va); 1937 } 1938 1939 pa = VM_PAGE_TO_PHYS(m) & PG_FRAME; 1940 origpte = *pte; 1941 opa = origpte & PG_FRAME; 1942 1943 if (origpte & PG_PS) { 1944 /* 1945 * Yes, I know this will truncate upper address bits for PAE, 1946 * but I'm actually more interested in the lower bits 1947 */ 1948 printf("pmap_enter: va %p, pte %p, origpte %p\n", 1949 (void *)va, (void *)pte, (void *)(uintptr_t)origpte); 1950 panic("pmap_enter: attempted pmap_enter on 4MB page"); 1951 } 1952 1953 /* 1954 * Mapping has not changed, must be protection or wiring change. 1955 */ 1956 if (origpte && (opa == pa)) { 1957 /* 1958 * Wiring change, just update stats. We don't worry about 1959 * wiring PT pages as they remain resident as long as there 1960 * are valid mappings in them. Hence, if a user page is wired, 1961 * the PT page will be also. 1962 */ 1963 if (wired && ((origpte & PG_W) == 0)) 1964 pmap->pm_stats.wired_count++; 1965 else if (!wired && (origpte & PG_W)) 1966 pmap->pm_stats.wired_count--; 1967 1968#if defined(PMAP_DIAGNOSTIC) 1969 if (pmap_nw_modified((pt_entry_t) origpte)) { 1970 printf( 1971 "pmap_enter: modified page not writable: va: 0x%x, pte: 0x%x\n", 1972 va, origpte); 1973 } 1974#endif 1975 1976 /* 1977 * Remove extra pte reference 1978 */ 1979 if (mpte) 1980 mpte->hold_count--; 1981 1982 /* 1983 * We might be turning off write access to the page, 1984 * so we go ahead and sense modify status. 1985 */ 1986 if (origpte & PG_MANAGED) { 1987 if ((origpte & PG_M) && pmap_track_modified(va)) { 1988 vm_page_t om; 1989 om = PHYS_TO_VM_PAGE(opa); 1990 vm_page_dirty(om); 1991 } 1992 pa |= PG_MANAGED; 1993 } 1994 goto validate; 1995 } 1996 /* 1997 * Mapping has changed, invalidate old range and fall through to 1998 * handle validating new mapping. 1999 */ 2000 if (opa) { 2001 int err; 2002 vm_page_lock_queues(); 2003 PMAP_LOCK(pmap); 2004 err = pmap_remove_pte(pmap, pte, va); 2005 PMAP_UNLOCK(pmap); 2006 vm_page_unlock_queues(); 2007 if (err) 2008 panic("pmap_enter: pte vanished, va: 0x%x", va); 2009 } 2010 2011 /* 2012 * Enter on the PV list if part of our managed memory. Note that we 2013 * raise IPL while manipulating pv_table since pmap_enter can be 2014 * called at interrupt time. 2015 */ 2016 if (pmap_initialized && 2017 (m->flags & (PG_FICTITIOUS|PG_UNMANAGED)) == 0) { 2018 pmap_insert_entry(pmap, va, m); 2019 pa |= PG_MANAGED; 2020 } 2021 2022 /* 2023 * Increment counters 2024 */ 2025 pmap->pm_stats.resident_count++; 2026 if (wired) 2027 pmap->pm_stats.wired_count++; 2028 2029validate: 2030 /* 2031 * Now validate mapping with desired protection/wiring. 2032 */ 2033 newpte = (pt_entry_t)(pa | PG_V); 2034 if ((prot & VM_PROT_WRITE) != 0) 2035 newpte |= PG_RW; 2036 if (wired) 2037 newpte |= PG_W; 2038 if (va < VM_MAXUSER_ADDRESS) 2039 newpte |= PG_U; 2040 if (pmap == kernel_pmap) 2041 newpte |= pgeflag; 2042 2043 /* 2044 * if the mapping or permission bits are different, we need 2045 * to update the pte. 2046 */ 2047 if ((origpte & ~(PG_M|PG_A)) != newpte) { 2048 pte_store(pte, newpte | PG_A); 2049 /*if (origpte)*/ { 2050 pmap_invalidate_page(pmap, va); 2051 } 2052 } 2053} 2054 2055/* 2056 * this code makes some *MAJOR* assumptions: 2057 * 1. Current pmap & pmap exists. 2058 * 2. Not wired. 2059 * 3. Read access. 2060 * 4. No page table pages. 2061 * 5. Tlbflush is deferred to calling procedure. 2062 * 6. Page IS managed. 2063 * but is *MUCH* faster than pmap_enter... 2064 */ 2065 2066vm_page_t 2067pmap_enter_quick(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_page_t mpte) 2068{ 2069 pt_entry_t *pte; 2070 vm_paddr_t pa; 2071 2072 /* 2073 * In the case that a page table page is not 2074 * resident, we are creating it here. 2075 */ 2076 if (va < VM_MAXUSER_ADDRESS) { 2077 unsigned ptepindex; 2078 pd_entry_t ptepa; 2079 2080 /* 2081 * Calculate pagetable page index 2082 */ 2083 ptepindex = va >> PDRSHIFT; 2084 if (mpte && (mpte->pindex == ptepindex)) { 2085 mpte->hold_count++; 2086 } else { 2087retry: 2088 /* 2089 * Get the page directory entry 2090 */ 2091 ptepa = pmap->pm_pdir[ptepindex]; 2092 2093 /* 2094 * If the page table page is mapped, we just increment 2095 * the hold count, and activate it. 2096 */ 2097 if (ptepa) { 2098 if (ptepa & PG_PS) 2099 panic("pmap_enter_quick: unexpected mapping into 4MB page"); 2100 mpte = PHYS_TO_VM_PAGE(ptepa); 2101 mpte->hold_count++; 2102 } else { 2103 mpte = _pmap_allocpte(pmap, ptepindex); 2104 if (mpte == NULL) 2105 goto retry; 2106 } 2107 } 2108 } else { 2109 mpte = NULL; 2110 } 2111 2112 /* 2113 * This call to vtopte makes the assumption that we are 2114 * entering the page into the current pmap. In order to support 2115 * quick entry into any pmap, one would likely use pmap_pte_quick. 2116 * But that isn't as quick as vtopte. 2117 */ 2118 pte = vtopte(va); 2119 if (*pte) { 2120 if (mpte != NULL) { 2121 vm_page_lock_queues(); 2122 pmap_unwire_pte_hold(pmap, mpte); 2123 vm_page_unlock_queues(); 2124 } 2125 return 0; 2126 } 2127 2128 /* 2129 * Enter on the PV list if part of our managed memory. Note that we 2130 * raise IPL while manipulating pv_table since pmap_enter can be 2131 * called at interrupt time. 2132 */ 2133 if ((m->flags & (PG_FICTITIOUS|PG_UNMANAGED)) == 0) 2134 pmap_insert_entry(pmap, va, m); 2135 2136 /* 2137 * Increment counters 2138 */ 2139 pmap->pm_stats.resident_count++; 2140 2141 pa = VM_PAGE_TO_PHYS(m); 2142 2143 /* 2144 * Now validate mapping with RO protection 2145 */ 2146 if (m->flags & (PG_FICTITIOUS|PG_UNMANAGED)) 2147 pte_store(pte, pa | PG_V | PG_U); 2148 else 2149 pte_store(pte, pa | PG_V | PG_U | PG_MANAGED); 2150 2151 return mpte; 2152} 2153 2154/* 2155 * Make a temporary mapping for a physical address. This is only intended 2156 * to be used for panic dumps. 2157 */ 2158void * 2159pmap_kenter_temporary(vm_paddr_t pa, int i) 2160{ 2161 vm_offset_t va; 2162 2163 va = (vm_offset_t)crashdumpmap + (i * PAGE_SIZE); 2164 pmap_kenter(va, pa); 2165#ifndef I386_CPU 2166 invlpg(va); 2167#else 2168 invltlb(); 2169#endif 2170 return ((void *)crashdumpmap); 2171} 2172 2173/* 2174 * This code maps large physical mmap regions into the 2175 * processor address space. Note that some shortcuts 2176 * are taken, but the code works. 2177 */ 2178void 2179pmap_object_init_pt(pmap_t pmap, vm_offset_t addr, 2180 vm_object_t object, vm_pindex_t pindex, 2181 vm_size_t size) 2182{ 2183 vm_page_t p; 2184 2185 VM_OBJECT_LOCK_ASSERT(object, MA_OWNED); 2186 KASSERT(object->type == OBJT_DEVICE, 2187 ("pmap_object_init_pt: non-device object")); 2188 if (pseflag && 2189 ((addr & (NBPDR - 1)) == 0) && ((size & (NBPDR - 1)) == 0)) { 2190 int i; 2191 vm_page_t m[1]; 2192 unsigned int ptepindex; 2193 int npdes; 2194 pd_entry_t ptepa; 2195 2196 if (pmap->pm_pdir[ptepindex = (addr >> PDRSHIFT)]) 2197 return; 2198retry: 2199 p = vm_page_lookup(object, pindex); 2200 if (p != NULL) { 2201 vm_page_lock_queues(); 2202 if (vm_page_sleep_if_busy(p, FALSE, "init4p")) 2203 goto retry; 2204 } else { 2205 p = vm_page_alloc(object, pindex, VM_ALLOC_NORMAL); 2206 if (p == NULL) 2207 return; 2208 m[0] = p; 2209 2210 if (vm_pager_get_pages(object, m, 1, 0) != VM_PAGER_OK) { 2211 vm_page_lock_queues(); 2212 vm_page_free(p); 2213 vm_page_unlock_queues(); 2214 return; 2215 } 2216 2217 p = vm_page_lookup(object, pindex); 2218 vm_page_lock_queues(); 2219 vm_page_wakeup(p); 2220 } 2221 vm_page_unlock_queues(); 2222 2223 ptepa = VM_PAGE_TO_PHYS(p); 2224 if (ptepa & (NBPDR - 1)) 2225 return; 2226 2227 p->valid = VM_PAGE_BITS_ALL; 2228 2229 pmap->pm_stats.resident_count += size >> PAGE_SHIFT; 2230 npdes = size >> PDRSHIFT; 2231 for(i = 0; i < npdes; i++) { 2232 pde_store(&pmap->pm_pdir[ptepindex], 2233 ptepa | PG_U | PG_RW | PG_V | PG_PS); 2234 ptepa += NBPDR; 2235 ptepindex += 1; 2236 } 2237 pmap_invalidate_all(pmap); 2238 } 2239} 2240 2241/* 2242 * Routine: pmap_change_wiring 2243 * Function: Change the wiring attribute for a map/virtual-address 2244 * pair. 2245 * In/out conditions: 2246 * The mapping must already exist in the pmap. 2247 */ 2248void 2249pmap_change_wiring(pmap, va, wired) 2250 register pmap_t pmap; 2251 vm_offset_t va; 2252 boolean_t wired; 2253{ 2254 register pt_entry_t *pte; 2255 2256 if (pmap == NULL) 2257 return; 2258 2259 PMAP_LOCK(pmap); 2260 pte = pmap_pte(pmap, va); 2261 2262 if (wired && !pmap_pte_w(pte)) 2263 pmap->pm_stats.wired_count++; 2264 else if (!wired && pmap_pte_w(pte)) 2265 pmap->pm_stats.wired_count--; 2266 2267 /* 2268 * Wiring is not a hardware characteristic so there is no need to 2269 * invalidate TLB. 2270 */ 2271 pmap_pte_set_w(pte, wired); 2272 PMAP_UNLOCK(pmap); 2273} 2274 2275 2276 2277/* 2278 * Copy the range specified by src_addr/len 2279 * from the source map to the range dst_addr/len 2280 * in the destination map. 2281 * 2282 * This routine is only advisory and need not do anything. 2283 */ 2284 2285void 2286pmap_copy(pmap_t dst_pmap, pmap_t src_pmap, vm_offset_t dst_addr, vm_size_t len, 2287 vm_offset_t src_addr) 2288{ 2289 vm_offset_t addr; 2290 vm_offset_t end_addr = src_addr + len; 2291 vm_offset_t pdnxt; 2292 vm_page_t m; 2293 2294 if (dst_addr != src_addr) 2295 return; 2296 2297 if (!pmap_is_current(src_pmap)) 2298 return; 2299 2300 for (addr = src_addr; addr < end_addr; addr = pdnxt) { 2301 pt_entry_t *src_pte, *dst_pte; 2302 vm_page_t dstmpte, srcmpte; 2303 pd_entry_t srcptepaddr; 2304 unsigned ptepindex; 2305 2306 if (addr >= UPT_MIN_ADDRESS) 2307 panic("pmap_copy: invalid to pmap_copy page tables\n"); 2308 2309 /* 2310 * Don't let optional prefaulting of pages make us go 2311 * way below the low water mark of free pages or way 2312 * above high water mark of used pv entries. 2313 */ 2314 if (cnt.v_free_count < cnt.v_free_reserved || 2315 pv_entry_count > pv_entry_high_water) 2316 break; 2317 2318 pdnxt = (addr + NBPDR) & ~PDRMASK; 2319 ptepindex = addr >> PDRSHIFT; 2320 2321 srcptepaddr = src_pmap->pm_pdir[ptepindex]; 2322 if (srcptepaddr == 0) 2323 continue; 2324 2325 if (srcptepaddr & PG_PS) { 2326 if (dst_pmap->pm_pdir[ptepindex] == 0) { 2327 dst_pmap->pm_pdir[ptepindex] = srcptepaddr; 2328 dst_pmap->pm_stats.resident_count += 2329 NBPDR / PAGE_SIZE; 2330 } 2331 continue; 2332 } 2333 2334 srcmpte = PHYS_TO_VM_PAGE(srcptepaddr); 2335 if (srcmpte->hold_count == 0 || (srcmpte->flags & PG_BUSY)) 2336 continue; 2337 2338 if (pdnxt > end_addr) 2339 pdnxt = end_addr; 2340 2341 src_pte = vtopte(addr); 2342 while (addr < pdnxt) { 2343 pt_entry_t ptetemp; 2344 ptetemp = *src_pte; 2345 /* 2346 * we only virtual copy managed pages 2347 */ 2348 if ((ptetemp & PG_MANAGED) != 0) { 2349 /* 2350 * We have to check after allocpte for the 2351 * pte still being around... allocpte can 2352 * block. 2353 */ 2354 dstmpte = pmap_allocpte(dst_pmap, addr); 2355 dst_pte = pmap_pte(dst_pmap, addr); 2356 if ((*dst_pte == 0) && (ptetemp = *src_pte)) { 2357 /* 2358 * Clear the modified and 2359 * accessed (referenced) bits 2360 * during the copy. 2361 */ 2362 m = PHYS_TO_VM_PAGE(ptetemp); 2363 *dst_pte = ptetemp & ~(PG_M | PG_A); 2364 dst_pmap->pm_stats.resident_count++; 2365 pmap_insert_entry(dst_pmap, addr, m); 2366 } else { 2367 vm_page_lock_queues(); 2368 pmap_unwire_pte_hold(dst_pmap, dstmpte); 2369 vm_page_unlock_queues(); 2370 } 2371 if (dstmpte->hold_count >= srcmpte->hold_count) 2372 break; 2373 } 2374 addr += PAGE_SIZE; 2375 src_pte++; 2376 } 2377 } 2378} 2379 2380static __inline void 2381pagezero(void *page) 2382{ 2383#if defined(I686_CPU) 2384 if (cpu_class == CPUCLASS_686) { 2385#if defined(CPU_ENABLE_SSE) 2386 if (cpu_feature & CPUID_SSE2) 2387 sse2_pagezero(page); 2388 else 2389#endif 2390 i686_pagezero(page); 2391 } else 2392#endif 2393 bzero(page, PAGE_SIZE); 2394} 2395 2396/* 2397 * pmap_zero_page zeros the specified hardware page by mapping 2398 * the page into KVM and using bzero to clear its contents. 2399 */ 2400void 2401pmap_zero_page(vm_page_t m) 2402{ 2403 2404 mtx_lock(&CMAPCADDR12_lock); 2405 if (*CMAP2) 2406 panic("pmap_zero_page: CMAP2 busy"); 2407 sched_pin(); 2408 *CMAP2 = PG_V | PG_RW | VM_PAGE_TO_PHYS(m) | PG_A | PG_M; 2409 invlcaddr(CADDR2); 2410 pagezero(CADDR2); 2411 *CMAP2 = 0; 2412 sched_unpin(); 2413 mtx_unlock(&CMAPCADDR12_lock); 2414} 2415 2416/* 2417 * pmap_zero_page_area zeros the specified hardware page by mapping 2418 * the page into KVM and using bzero to clear its contents. 2419 * 2420 * off and size may not cover an area beyond a single hardware page. 2421 */ 2422void 2423pmap_zero_page_area(vm_page_t m, int off, int size) 2424{ 2425 2426 mtx_lock(&CMAPCADDR12_lock); 2427 if (*CMAP2) 2428 panic("pmap_zero_page: CMAP2 busy"); 2429 sched_pin(); 2430 *CMAP2 = PG_V | PG_RW | VM_PAGE_TO_PHYS(m) | PG_A | PG_M; 2431 invlcaddr(CADDR2); 2432 if (off == 0 && size == PAGE_SIZE) 2433 pagezero(CADDR2); 2434 else 2435 bzero((char *)CADDR2 + off, size); 2436 *CMAP2 = 0; 2437 sched_unpin(); 2438 mtx_unlock(&CMAPCADDR12_lock); 2439} 2440 2441/* 2442 * pmap_zero_page_idle zeros the specified hardware page by mapping 2443 * the page into KVM and using bzero to clear its contents. This 2444 * is intended to be called from the vm_pagezero process only and 2445 * outside of Giant. 2446 */ 2447void 2448pmap_zero_page_idle(vm_page_t m) 2449{ 2450 2451 if (*CMAP3) 2452 panic("pmap_zero_page: CMAP3 busy"); 2453 sched_pin(); 2454 *CMAP3 = PG_V | PG_RW | VM_PAGE_TO_PHYS(m) | PG_A | PG_M; 2455 invlcaddr(CADDR3); 2456 pagezero(CADDR3); 2457 *CMAP3 = 0; 2458 sched_unpin(); 2459} 2460 2461/* 2462 * pmap_copy_page copies the specified (machine independent) 2463 * page by mapping the page into virtual memory and using 2464 * bcopy to copy the page, one machine dependent page at a 2465 * time. 2466 */ 2467void 2468pmap_copy_page(vm_page_t src, vm_page_t dst) 2469{ 2470 2471 mtx_lock(&CMAPCADDR12_lock); 2472 if (*CMAP1) 2473 panic("pmap_copy_page: CMAP1 busy"); 2474 if (*CMAP2) 2475 panic("pmap_copy_page: CMAP2 busy"); 2476 sched_pin(); 2477#ifdef I386_CPU 2478 invltlb(); 2479#else 2480 invlpg((u_int)CADDR1); 2481 invlpg((u_int)CADDR2); 2482#endif 2483 *CMAP1 = PG_V | VM_PAGE_TO_PHYS(src) | PG_A; 2484 *CMAP2 = PG_V | PG_RW | VM_PAGE_TO_PHYS(dst) | PG_A | PG_M; 2485 bcopy(CADDR1, CADDR2, PAGE_SIZE); 2486 *CMAP1 = 0; 2487 *CMAP2 = 0; 2488 sched_unpin(); 2489 mtx_unlock(&CMAPCADDR12_lock); 2490} 2491 2492/* 2493 * Returns true if the pmap's pv is one of the first 2494 * 16 pvs linked to from this page. This count may 2495 * be changed upwards or downwards in the future; it 2496 * is only necessary that true be returned for a small 2497 * subset of pmaps for proper page aging. 2498 */ 2499boolean_t 2500pmap_page_exists_quick(pmap, m) 2501 pmap_t pmap; 2502 vm_page_t m; 2503{ 2504 pv_entry_t pv; 2505 int loops = 0; 2506 2507 if (!pmap_initialized || (m->flags & PG_FICTITIOUS)) 2508 return FALSE; 2509 2510 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 2511 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 2512 if (pv->pv_pmap == pmap) { 2513 return TRUE; 2514 } 2515 loops++; 2516 if (loops >= 16) 2517 break; 2518 } 2519 return (FALSE); 2520} 2521 2522#define PMAP_REMOVE_PAGES_CURPROC_ONLY 2523/* 2524 * Remove all pages from specified address space 2525 * this aids process exit speeds. Also, this code 2526 * is special cased for current process only, but 2527 * can have the more generic (and slightly slower) 2528 * mode enabled. This is much faster than pmap_remove 2529 * in the case of running down an entire address space. 2530 */ 2531void 2532pmap_remove_pages(pmap, sva, eva) 2533 pmap_t pmap; 2534 vm_offset_t sva, eva; 2535{ 2536 pt_entry_t *pte, tpte; 2537 vm_page_t m; 2538 pv_entry_t pv, npv; 2539 2540#ifdef PMAP_REMOVE_PAGES_CURPROC_ONLY 2541 if (!curthread || (pmap != vmspace_pmap(curthread->td_proc->p_vmspace))) { 2542 printf("warning: pmap_remove_pages called with non-current pmap\n"); 2543 return; 2544 } 2545#endif 2546 vm_page_lock_queues(); 2547 PMAP_LOCK(pmap); 2548 sched_pin(); 2549 for (pv = TAILQ_FIRST(&pmap->pm_pvlist); pv; pv = npv) { 2550 2551 if (pv->pv_va >= eva || pv->pv_va < sva) { 2552 npv = TAILQ_NEXT(pv, pv_plist); 2553 continue; 2554 } 2555 2556#ifdef PMAP_REMOVE_PAGES_CURPROC_ONLY 2557 pte = vtopte(pv->pv_va); 2558#else 2559 pte = pmap_pte_quick(pmap, pv->pv_va); 2560#endif 2561 tpte = *pte; 2562 2563 if (tpte == 0) { 2564 printf("TPTE at %p IS ZERO @ VA %08x\n", 2565 pte, pv->pv_va); 2566 panic("bad pte"); 2567 } 2568 2569/* 2570 * We cannot remove wired pages from a process' mapping at this time 2571 */ 2572 if (tpte & PG_W) { 2573 npv = TAILQ_NEXT(pv, pv_plist); 2574 continue; 2575 } 2576 2577 m = PHYS_TO_VM_PAGE(tpte); 2578 KASSERT(m->phys_addr == (tpte & PG_FRAME), 2579 ("vm_page_t %p phys_addr mismatch %016jx %016jx", 2580 m, (uintmax_t)m->phys_addr, (uintmax_t)tpte)); 2581 2582 KASSERT(m < &vm_page_array[vm_page_array_size], 2583 ("pmap_remove_pages: bad tpte %#jx", (uintmax_t)tpte)); 2584 2585 pmap->pm_stats.resident_count--; 2586 2587 pte_clear(pte); 2588 2589 /* 2590 * Update the vm_page_t clean and reference bits. 2591 */ 2592 if (tpte & PG_M) { 2593 vm_page_dirty(m); 2594 } 2595 2596 npv = TAILQ_NEXT(pv, pv_plist); 2597 TAILQ_REMOVE(&pmap->pm_pvlist, pv, pv_plist); 2598 2599 m->md.pv_list_count--; 2600 TAILQ_REMOVE(&m->md.pv_list, pv, pv_list); 2601 if (TAILQ_EMPTY(&m->md.pv_list)) 2602 vm_page_flag_clear(m, PG_WRITEABLE); 2603 2604 pmap_unuse_pt(pmap, pv->pv_va); 2605 free_pv_entry(pv); 2606 } 2607 sched_unpin(); 2608 pmap_invalidate_all(pmap); 2609 PMAP_UNLOCK(pmap); 2610 vm_page_unlock_queues(); 2611} 2612 2613/* 2614 * pmap_is_modified: 2615 * 2616 * Return whether or not the specified physical page was modified 2617 * in any physical maps. 2618 */ 2619boolean_t 2620pmap_is_modified(vm_page_t m) 2621{ 2622 pv_entry_t pv; 2623 pt_entry_t *pte; 2624 boolean_t rv; 2625 2626 rv = FALSE; 2627 if (!pmap_initialized || (m->flags & PG_FICTITIOUS)) 2628 return (rv); 2629 2630 sched_pin(); 2631 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 2632 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 2633 /* 2634 * if the bit being tested is the modified bit, then 2635 * mark clean_map and ptes as never 2636 * modified. 2637 */ 2638 if (!pmap_track_modified(pv->pv_va)) 2639 continue; 2640#if defined(PMAP_DIAGNOSTIC) 2641 if (!pv->pv_pmap) { 2642 printf("Null pmap (tb) at va: 0x%x\n", pv->pv_va); 2643 continue; 2644 } 2645#endif 2646 PMAP_LOCK(pv->pv_pmap); 2647 pte = pmap_pte_quick(pv->pv_pmap, pv->pv_va); 2648 rv = (*pte & PG_M) != 0; 2649 PMAP_UNLOCK(pv->pv_pmap); 2650 if (rv) 2651 break; 2652 } 2653 sched_unpin(); 2654 return (rv); 2655} 2656 2657/* 2658 * pmap_is_prefaultable: 2659 * 2660 * Return whether or not the specified virtual address is elgible 2661 * for prefault. 2662 */ 2663boolean_t 2664pmap_is_prefaultable(pmap_t pmap, vm_offset_t addr) 2665{ 2666 pt_entry_t *pte; 2667 boolean_t rv; 2668 2669 rv = FALSE; 2670 PMAP_LOCK(pmap); 2671 if (*pmap_pde(pmap, addr)) { 2672 pte = vtopte(addr); 2673 rv = *pte == 0; 2674 } 2675 PMAP_UNLOCK(pmap); 2676 return (rv); 2677} 2678 2679/* 2680 * Clear the given bit in each of the given page's ptes. 2681 */ 2682static __inline void 2683pmap_clear_ptes(vm_page_t m, int bit) 2684{ 2685 register pv_entry_t pv; 2686 pt_entry_t pbits, *pte; 2687 2688 if (!pmap_initialized || (m->flags & PG_FICTITIOUS) || 2689 (bit == PG_RW && (m->flags & PG_WRITEABLE) == 0)) 2690 return; 2691 2692 sched_pin(); 2693 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 2694 /* 2695 * Loop over all current mappings setting/clearing as appropos If 2696 * setting RO do we need to clear the VAC? 2697 */ 2698 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 2699 /* 2700 * don't write protect pager mappings 2701 */ 2702 if (bit == PG_RW) { 2703 if (!pmap_track_modified(pv->pv_va)) 2704 continue; 2705 } 2706 2707#if defined(PMAP_DIAGNOSTIC) 2708 if (!pv->pv_pmap) { 2709 printf("Null pmap (cb) at va: 0x%x\n", pv->pv_va); 2710 continue; 2711 } 2712#endif 2713 2714 PMAP_LOCK(pv->pv_pmap); 2715 pte = pmap_pte_quick(pv->pv_pmap, pv->pv_va); 2716 pbits = *pte; 2717 if (pbits & bit) { 2718 if (bit == PG_RW) { 2719 if (pbits & PG_M) { 2720 vm_page_dirty(m); 2721 } 2722 pte_store(pte, pbits & ~(PG_M|PG_RW)); 2723 } else { 2724 pte_store(pte, pbits & ~bit); 2725 } 2726 pmap_invalidate_page(pv->pv_pmap, pv->pv_va); 2727 } 2728 PMAP_UNLOCK(pv->pv_pmap); 2729 } 2730 if (bit == PG_RW) 2731 vm_page_flag_clear(m, PG_WRITEABLE); 2732 sched_unpin(); 2733} 2734 2735/* 2736 * pmap_page_protect: 2737 * 2738 * Lower the permission for all mappings to a given page. 2739 */ 2740void 2741pmap_page_protect(vm_page_t m, vm_prot_t prot) 2742{ 2743 if ((prot & VM_PROT_WRITE) == 0) { 2744 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { 2745 pmap_clear_ptes(m, PG_RW); 2746 } else { 2747 pmap_remove_all(m); 2748 } 2749 } 2750} 2751 2752/* 2753 * pmap_ts_referenced: 2754 * 2755 * Return a count of reference bits for a page, clearing those bits. 2756 * It is not necessary for every reference bit to be cleared, but it 2757 * is necessary that 0 only be returned when there are truly no 2758 * reference bits set. 2759 * 2760 * XXX: The exact number of bits to check and clear is a matter that 2761 * should be tested and standardized at some point in the future for 2762 * optimal aging of shared pages. 2763 */ 2764int 2765pmap_ts_referenced(vm_page_t m) 2766{ 2767 register pv_entry_t pv, pvf, pvn; 2768 pt_entry_t *pte; 2769 pt_entry_t v; 2770 int rtval = 0; 2771 2772 if (!pmap_initialized || (m->flags & PG_FICTITIOUS)) 2773 return (rtval); 2774 2775 sched_pin(); 2776 mtx_assert(&vm_page_queue_mtx, MA_OWNED); 2777 if ((pv = TAILQ_FIRST(&m->md.pv_list)) != NULL) { 2778 2779 pvf = pv; 2780 2781 do { 2782 pvn = TAILQ_NEXT(pv, pv_list); 2783 2784 TAILQ_REMOVE(&m->md.pv_list, pv, pv_list); 2785 2786 TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list); 2787 2788 if (!pmap_track_modified(pv->pv_va)) 2789 continue; 2790 2791 PMAP_LOCK(pv->pv_pmap); 2792 pte = pmap_pte_quick(pv->pv_pmap, pv->pv_va); 2793 2794 if (pte && ((v = pte_load(pte)) & PG_A) != 0) { 2795 atomic_clear_int((u_int *)pte, PG_A); 2796 pmap_invalidate_page(pv->pv_pmap, pv->pv_va); 2797 2798 rtval++; 2799 if (rtval > 4) { 2800 PMAP_UNLOCK(pv->pv_pmap); 2801 break; 2802 } 2803 } 2804 PMAP_UNLOCK(pv->pv_pmap); 2805 } while ((pv = pvn) != NULL && pv != pvf); 2806 } 2807 sched_unpin(); 2808 2809 return (rtval); 2810} 2811 2812/* 2813 * Clear the modify bits on the specified physical page. 2814 */ 2815void 2816pmap_clear_modify(vm_page_t m) 2817{ 2818 pmap_clear_ptes(m, PG_M); 2819} 2820 2821/* 2822 * pmap_clear_reference: 2823 * 2824 * Clear the reference bit on the specified physical page. 2825 */ 2826void 2827pmap_clear_reference(vm_page_t m) 2828{ 2829 pmap_clear_ptes(m, PG_A); 2830} 2831 2832/* 2833 * Miscellaneous support routines follow 2834 */ 2835 2836/* 2837 * Map a set of physical memory pages into the kernel virtual 2838 * address space. Return a pointer to where it is mapped. This 2839 * routine is intended to be used for mapping device memory, 2840 * NOT real memory. 2841 */ 2842void * 2843pmap_mapdev(pa, size) 2844 vm_paddr_t pa; 2845 vm_size_t size; 2846{ 2847 vm_offset_t va, tmpva, offset; 2848 2849 offset = pa & PAGE_MASK; 2850 size = roundup(offset + size, PAGE_SIZE); 2851 pa = pa & PG_FRAME; 2852 2853 if (pa < KERNLOAD && pa + size <= KERNLOAD) 2854 va = KERNBASE + pa; 2855 else 2856 va = kmem_alloc_nofault(kernel_map, size); 2857 if (!va) 2858 panic("pmap_mapdev: Couldn't alloc kernel virtual memory"); 2859 2860 for (tmpva = va; size > 0; ) { 2861 pmap_kenter(tmpva, pa); 2862 size -= PAGE_SIZE; 2863 tmpva += PAGE_SIZE; 2864 pa += PAGE_SIZE; 2865 } 2866 pmap_invalidate_range(kernel_pmap, va, tmpva); 2867 return ((void *)(va + offset)); 2868} 2869 2870void 2871pmap_unmapdev(va, size) 2872 vm_offset_t va; 2873 vm_size_t size; 2874{ 2875 vm_offset_t base, offset, tmpva; 2876 2877 if (va >= KERNBASE && va + size <= KERNBASE + KERNLOAD) 2878 return; 2879 base = va & PG_FRAME; 2880 offset = va & PAGE_MASK; 2881 size = roundup(offset + size, PAGE_SIZE); 2882 for (tmpva = base; tmpva < (base + size); tmpva += PAGE_SIZE) 2883 pmap_kremove(tmpva); 2884 pmap_invalidate_range(kernel_pmap, va, tmpva); 2885 kmem_free(kernel_map, base, size); 2886} 2887 2888/* 2889 * perform the pmap work for mincore 2890 */ 2891int 2892pmap_mincore(pmap, addr) 2893 pmap_t pmap; 2894 vm_offset_t addr; 2895{ 2896 pt_entry_t *ptep, pte; 2897 vm_page_t m; 2898 int val = 0; 2899 2900 PMAP_LOCK(pmap); 2901 ptep = pmap_pte(pmap, addr); 2902 pte = (ptep != NULL) ? *ptep : 0; 2903 PMAP_UNLOCK(pmap); 2904 2905 if (pte != 0) { 2906 vm_paddr_t pa; 2907 2908 val = MINCORE_INCORE; 2909 if ((pte & PG_MANAGED) == 0) 2910 return val; 2911 2912 pa = pte & PG_FRAME; 2913 2914 m = PHYS_TO_VM_PAGE(pa); 2915 2916 /* 2917 * Modified by us 2918 */ 2919 if (pte & PG_M) 2920 val |= MINCORE_MODIFIED|MINCORE_MODIFIED_OTHER; 2921 else { 2922 /* 2923 * Modified by someone else 2924 */ 2925 vm_page_lock_queues(); 2926 if (m->dirty || pmap_is_modified(m)) 2927 val |= MINCORE_MODIFIED_OTHER; 2928 vm_page_unlock_queues(); 2929 } 2930 /* 2931 * Referenced by us 2932 */ 2933 if (pte & PG_A) 2934 val |= MINCORE_REFERENCED|MINCORE_REFERENCED_OTHER; 2935 else { 2936 /* 2937 * Referenced by someone else 2938 */ 2939 vm_page_lock_queues(); 2940 if ((m->flags & PG_REFERENCED) || 2941 pmap_ts_referenced(m)) { 2942 val |= MINCORE_REFERENCED_OTHER; 2943 vm_page_flag_set(m, PG_REFERENCED); 2944 } 2945 vm_page_unlock_queues(); 2946 } 2947 } 2948 return val; 2949} 2950 2951void 2952pmap_activate(struct thread *td) 2953{ 2954 struct proc *p = td->td_proc; 2955 pmap_t pmap, oldpmap; 2956 u_int32_t cr3; 2957 2958 critical_enter(); 2959 pmap = vmspace_pmap(td->td_proc->p_vmspace); 2960 oldpmap = PCPU_GET(curpmap); 2961#if defined(SMP) 2962 atomic_clear_int(&oldpmap->pm_active, PCPU_GET(cpumask)); 2963 atomic_set_int(&pmap->pm_active, PCPU_GET(cpumask)); 2964#else 2965 oldpmap->pm_active &= ~1; 2966 pmap->pm_active |= 1; 2967#endif 2968#ifdef PAE 2969 cr3 = vtophys(pmap->pm_pdpt); 2970#else 2971 cr3 = vtophys(pmap->pm_pdir); 2972#endif 2973 /* XXXKSE this is wrong. 2974 * pmap_activate is for the current thread on the current cpu 2975 */ 2976 if (p->p_flag & P_SA) { 2977 /* Make sure all other cr3 entries are updated. */ 2978 /* what if they are running? XXXKSE (maybe abort them) */ 2979 FOREACH_THREAD_IN_PROC(p, td) { 2980 td->td_pcb->pcb_cr3 = cr3; 2981 } 2982 } else { 2983 td->td_pcb->pcb_cr3 = cr3; 2984 } 2985 load_cr3(cr3); 2986 PCPU_SET(curpmap, pmap); 2987 critical_exit(); 2988} 2989 2990vm_offset_t 2991pmap_addr_hint(vm_object_t obj, vm_offset_t addr, vm_size_t size) 2992{ 2993 2994 if ((obj == NULL) || (size < NBPDR) || (obj->type != OBJT_DEVICE)) { 2995 return addr; 2996 } 2997 2998 addr = (addr + PDRMASK) & ~PDRMASK; 2999 return addr; 3000} 3001 3002 3003#if defined(PMAP_DEBUG) 3004pmap_pid_dump(int pid) 3005{ 3006 pmap_t pmap; 3007 struct proc *p; 3008 int npte = 0; 3009 int index; 3010 3011 sx_slock(&allproc_lock); 3012 LIST_FOREACH(p, &allproc, p_list) { 3013 if (p->p_pid != pid) 3014 continue; 3015 3016 if (p->p_vmspace) { 3017 int i,j; 3018 index = 0; 3019 pmap = vmspace_pmap(p->p_vmspace); 3020 for (i = 0; i < NPDEPTD; i++) { 3021 pd_entry_t *pde; 3022 pt_entry_t *pte; 3023 vm_offset_t base = i << PDRSHIFT; 3024 3025 pde = &pmap->pm_pdir[i]; 3026 if (pde && pmap_pde_v(pde)) { 3027 for (j = 0; j < NPTEPG; j++) { 3028 vm_offset_t va = base + (j << PAGE_SHIFT); 3029 if (va >= (vm_offset_t) VM_MIN_KERNEL_ADDRESS) { 3030 if (index) { 3031 index = 0; 3032 printf("\n"); 3033 } 3034 sx_sunlock(&allproc_lock); 3035 return npte; 3036 } 3037 pte = pmap_pte(pmap, va); 3038 if (pte && pmap_pte_v(pte)) { 3039 pt_entry_t pa; 3040 vm_page_t m; 3041 pa = *pte; 3042 m = PHYS_TO_VM_PAGE(pa); 3043 printf("va: 0x%x, pt: 0x%x, h: %d, w: %d, f: 0x%x", 3044 va, pa, m->hold_count, m->wire_count, m->flags); 3045 npte++; 3046 index++; 3047 if (index >= 2) { 3048 index = 0; 3049 printf("\n"); 3050 } else { 3051 printf(" "); 3052 } 3053 } 3054 } 3055 } 3056 } 3057 } 3058 } 3059 sx_sunlock(&allproc_lock); 3060 return npte; 3061} 3062#endif 3063 3064#if defined(DEBUG) 3065 3066static void pads(pmap_t pm); 3067void pmap_pvdump(vm_offset_t pa); 3068 3069/* print address space of pmap*/ 3070static void 3071pads(pm) 3072 pmap_t pm; 3073{ 3074 int i, j; 3075 vm_paddr_t va; 3076 pt_entry_t *ptep; 3077 3078 if (pm == kernel_pmap) 3079 return; 3080 for (i = 0; i < NPDEPTD; i++) 3081 if (pm->pm_pdir[i]) 3082 for (j = 0; j < NPTEPG; j++) { 3083 va = (i << PDRSHIFT) + (j << PAGE_SHIFT); 3084 if (pm == kernel_pmap && va < KERNBASE) 3085 continue; 3086 if (pm != kernel_pmap && va > UPT_MAX_ADDRESS) 3087 continue; 3088 ptep = pmap_pte(pm, va); 3089 if (pmap_pte_v(ptep)) 3090 printf("%x:%x ", va, *ptep); 3091 }; 3092 3093} 3094 3095void 3096pmap_pvdump(pa) 3097 vm_paddr_t pa; 3098{ 3099 pv_entry_t pv; 3100 vm_page_t m; 3101 3102 printf("pa %x", pa); 3103 m = PHYS_TO_VM_PAGE(pa); 3104 TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) { 3105 printf(" -> pmap %p, va %x", (void *)pv->pv_pmap, pv->pv_va); 3106 pads(pv->pv_pmap); 3107 } 3108 printf(" "); 3109} 3110#endif 3111