pmap.c revision 45960
190618Stmm/* 290618Stmm * Copyright (c) 1991 Regents of the University of California. 390618Stmm * All rights reserved. 490618Stmm * Copyright (c) 1994 John S. Dyson 590618Stmm * All rights reserved. 690618Stmm * Copyright (c) 1994 David Greenman 790618Stmm * All rights reserved. 890618Stmm * 990618Stmm * This code is derived from software contributed to Berkeley by 1090618Stmm * the Systems Programming Group of the University of Utah Computer 1190618Stmm * Science Department and William Jolitz of UUNET Technologies Inc. 1290618Stmm * 1390618Stmm * Redistribution and use in source and binary forms, with or without 1490618Stmm * modification, are permitted provided that the following conditions 1590618Stmm * are met: 1690618Stmm * 1. Redistributions of source code must retain the above copyright 1790618Stmm * notice, this list of conditions and the following disclaimer. 1890618Stmm * 2. Redistributions in binary form must reproduce the above copyright 1990618Stmm * notice, this list of conditions and the following disclaimer in the 2090618Stmm * documentation and/or other materials provided with the distribution. 2190618Stmm * 3. All advertising materials mentioning features or use of this software 2290618Stmm * must display the following acknowledgement: 2390618Stmm * This product includes software developed by the University of 2490618Stmm * California, Berkeley and its contributors. 2590618Stmm * 4. Neither the name of the University nor the names of its contributors 2690618Stmm * may be used to endorse or promote products derived from this software 2790618Stmm * without specific prior written permission. 2890618Stmm * 2990618Stmm * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 3090618Stmm * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 3190618Stmm * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 3290618Stmm * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 3390618Stmm * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 3490618Stmm * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 3590618Stmm * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36139825Simp * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3790618Stmm * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3890618Stmm * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3990618Stmm * SUCH DAMAGE. 4090618Stmm * 4190618Stmm * from: @(#)pmap.c 7.7 (Berkeley) 5/12/91 4290618Stmm * $Id: pmap.c,v 1.231 1999/04/19 18:45:21 alc Exp $ 4390618Stmm */ 4490618Stmm 4590618Stmm/* 4690618Stmm * Manages physical address maps. 4790618Stmm * 4890618Stmm * In addition to hardware address maps, this 4990618Stmm * module is called upon to provide software-use-only 5090618Stmm * maps which may or may not be stored in the same 5190618Stmm * form as hardware maps. These pseudo-maps are 5290618Stmm * used to store intermediate results from copy 5390618Stmm * operations to and from address spaces. 5490618Stmm * 5590618Stmm * Since the information managed by this module is 5690618Stmm * also stored by the logical address mapping module, 5790618Stmm * this module may throw away valid virtual-to-physical 5890618Stmm * mappings at almost any time. However, invalidations 5990618Stmm * of virtual-to-physical mappings must be done as 6090618Stmm * requested. 6190618Stmm * 6290618Stmm * In order to cope with hardware architectures which 6390618Stmm * make virtual-to-physical map invalidates expensive, 6490618Stmm * this module may delay invalidate or reduced protection 6590618Stmm * operations until such time as they are actually 6690618Stmm * necessary. This module is given full information as 6790618Stmm * to which processors are currently using which maps, 6890618Stmm * and to when physical maps must be made correct. 6990618Stmm */ 7090618Stmm 7190618Stmm#include "opt_disable_pse.h" 7290618Stmm#include "opt_pmap.h" 73139825Simp#include "opt_msgbuf.h" 7490618Stmm 7590618Stmm#include <sys/param.h> 76167308Smarius#include <sys/systm.h> 7790618Stmm#include <sys/proc.h> 7890618Stmm#include <sys/msgbuf.h> 7990618Stmm#include <sys/vmmeter.h> 8090618Stmm#include <sys/mman.h> 8190618Stmm 8290618Stmm#include <vm/vm.h> 8390618Stmm#include <vm/vm_param.h> 8490618Stmm#include <vm/vm_prot.h> 8590618Stmm#include <sys/lock.h> 8690618Stmm#include <vm/vm_kern.h> 8790618Stmm#include <vm/vm_page.h> 8890618Stmm#include <vm/vm_map.h> 8990618Stmm#include <vm/vm_object.h> 9090618Stmm#include <vm/vm_extern.h> 9190618Stmm#include <vm/vm_pageout.h> 9290618Stmm#include <vm/vm_pager.h> 9390618Stmm#include <vm/vm_zone.h> 9490618Stmm 9590618Stmm#include <sys/user.h> 9690618Stmm 9790618Stmm#include <machine/cputypes.h> 9890618Stmm#include <machine/md_var.h> 9990618Stmm#include <machine/specialreg.h> 10090618Stmm#if defined(SMP) || defined(APIC_IO) 101145185Smarius#include <machine/smp.h> 102145185Smarius#include <machine/apic.h> 103145185Smarius#endif /* SMP || APIC_IO */ 10490618Stmm 105145185Smarius#define PMAP_KEEP_PDIRS 10690618Stmm#ifndef PMAP_SHPGPERPROC 107131376Smarius#define PMAP_SHPGPERPROC 200 10890618Stmm#endif 10990618Stmm 11090618Stmm#if defined(DIAGNOSTIC) 11190618Stmm#define PMAP_DIAGNOSTIC 11290618Stmm#endif 113130068Sphk 114107477Stmm#define MINPV 2048 11590618Stmm 11690618Stmm#if !defined(PMAP_DIAGNOSTIC) 117133589Smarius#define PMAP_INLINE __inline 118152684Smarius#else 119119338Simp#define PMAP_INLINE 12090618Stmm#endif 12190618Stmm 122116541Stmm/* 12390618Stmm * Get PDEs and PTEs for user/kernel address space 12490618Stmm */ 12590618Stmm#define pmap_pde(m, v) (&((m)->pm_pdir[(vm_offset_t)(v) >> PDRSHIFT])) 12690618Stmm#define pdir_pde(m, v) (m[(vm_offset_t)(v) >> PDRSHIFT]) 12790618Stmm 12890618Stmm#define pmap_pde_v(pte) ((*(int *)pte & PG_V) != 0) 12990618Stmm#define pmap_pte_w(pte) ((*(int *)pte & PG_W) != 0) 13090618Stmm#define pmap_pte_m(pte) ((*(int *)pte & PG_M) != 0) 13190618Stmm#define pmap_pte_u(pte) ((*(int *)pte & PG_A) != 0) 13290618Stmm#define pmap_pte_v(pte) ((*(int *)pte & PG_V) != 0) 13390618Stmm 13490618Stmm#define pmap_pte_set_w(pte, v) ((v)?(*(int *)pte |= PG_W):(*(int *)pte &= ~PG_W)) 13590618Stmm#define pmap_pte_set_prot(pte, v) ((*(int *)pte &= ~PG_PROT), (*(int *)pte |= (v))) 13690618Stmm 137145186Smarius/* 13890618Stmm * Given a map and a machine independent protection code, 13990618Stmm * convert to a vax protection code. 140152684Smarius */ 14190618Stmm#define pte_prot(m, p) (protection_codes[p]) 14290618Stmmstatic int protection_codes[8]; 14390618Stmm 14490618Stmm#define pa_index(pa) atop((pa) - vm_first_phys) 14590618Stmm#define pa_to_pvh(pa) (&pv_table[pa_index(pa)]) 14690618Stmm 14790618Stmmstatic struct pmap kernel_pmap_store; 14890618Stmmpmap_t kernel_pmap; 14990618Stmmextern pd_entry_t my_idlePTD; 15090618Stmm 15190618Stmmvm_offset_t avail_start; /* PA of first available physical page */ 15290618Stmmvm_offset_t avail_end; /* PA of last available physical page */ 15390618Stmmvm_offset_t virtual_avail; /* VA of first avail page (after kernel bss) */ 15490618Stmmvm_offset_t virtual_end; /* VA of last avail page (end of kernel AS) */ 15590618Stmmstatic boolean_t pmap_initialized = FALSE; /* Has pmap_init completed? */ 15690618Stmmstatic vm_offset_t vm_first_phys; 15790618Stmmstatic int pgeflag; /* PG_G or-in */ 15890618Stmmstatic int pseflag; /* PG_PS or-in */ 15990618Stmmstatic int pv_npg; 16090618Stmm 16190618Stmmstatic vm_object_t kptobj; 16290618Stmm 16390618Stmmstatic int nkpt; 164145185Smariusvm_offset_t kernel_vm_end; 16590618Stmm 16690618Stmm/* 167145185Smarius * Data for the pv entry allocation mechanism 168145185Smarius */ 16990618Stmmstatic vm_zone_t pvzone; 17090618Stmmstatic struct vm_zone pvzone_store; 17190618Stmmstatic struct vm_object pvzone_obj; 17290618Stmmstatic int pv_entry_count=0, pv_entry_max=0, pv_entry_high_water=0; 17390618Stmmstatic int pmap_pagedaemon_waken = 0; 17490618Stmmstatic struct pv_entry *pvinit; 17590618Stmm 17690618Stmm/* 17790618Stmm * All those kernel PT submaps that BSD is so fond of 178145185Smarius */ 179166901Spisopt_entry_t *CMAP1 = 0; 180145185Smariusstatic pt_entry_t *CMAP2, *ptmmap; 181145185Smariusstatic pv_table_t *pv_table; 18290618Stmmcaddr_t CADDR1 = 0, ptvmmap = 0; 18390618Stmmstatic caddr_t CADDR2; 18490618Stmmstatic pt_entry_t *msgbufmap; 18590618Stmmstruct msgbuf *msgbufp=0; 18690618Stmm 18790618Stmm/* AIO support */ 18890618Stmmextern struct vmspace *aiovmspace; 189145185Smarius 190145186Smarius#ifdef SMP 191145185Smariusextern char prv_CPAGE1[], prv_CPAGE2[], prv_CPAGE3[]; 192145185Smariusextern pt_entry_t *prv_CMAP1, *prv_CMAP2, *prv_CMAP3; 193145185Smariusextern pd_entry_t *IdlePTDS[]; 194145185Smariusextern pt_entry_t SMP_prvpt[]; 195145185Smarius#endif 196145185Smarius 197145185Smarius#ifdef SMP 198145185Smariusextern unsigned int prv_PPAGE1[]; 199145185Smariusextern pt_entry_t *prv_PMAP1; 200145185Smarius#else 201167308Smariusstatic pt_entry_t *PMAP1 = 0; 202152684Smariusstatic unsigned *PADDR1 = 0; 20390618Stmm#endif 204146391Smarius 205152684Smariusstatic PMAP_INLINE void free_pv_entry __P((pv_entry_t pv)); 206152684Smariusstatic unsigned * get_ptbase __P((pmap_t pmap)); 207152684Smariusstatic pv_entry_t get_pv_entry __P((void)); 208167308Smariusstatic void i386_protection_init __P((void)); 20990618Stmmstatic __inline void pmap_changebit __P((vm_offset_t pa, int bit, boolean_t setem)); 210167308Smariusstatic void pmap_clearbit __P((vm_offset_t pa, int bit)); 211167308Smarius 212152684Smariusstatic PMAP_INLINE int pmap_is_managed __P((vm_offset_t pa)); 21390618Stmmstatic void pmap_remove_all __P((vm_offset_t pa)); 21490618Stmmstatic vm_page_t pmap_enter_quick __P((pmap_t pmap, vm_offset_t va, 21590618Stmm vm_offset_t pa, vm_page_t mpte)); 21690618Stmmstatic int pmap_remove_pte __P((struct pmap *pmap, unsigned *ptq, 217145186Smarius vm_offset_t sva)); 218154870Smariusstatic void pmap_remove_page __P((struct pmap *pmap, vm_offset_t va)); 219154870Smariusstatic int pmap_remove_entry __P((struct pmap *pmap, pv_table_t *pv, 220154870Smarius vm_offset_t va)); 22190618Stmmstatic boolean_t pmap_testbit __P((vm_offset_t pa, int bit)); 22290618Stmmstatic void pmap_insert_entry __P((pmap_t pmap, vm_offset_t va, 22390618Stmm vm_page_t mpte, vm_offset_t pa)); 22490618Stmm 22590618Stmmstatic vm_page_t pmap_allocpte __P((pmap_t pmap, vm_offset_t va)); 22690618Stmm 22790618Stmmstatic int pmap_release_free_page __P((pmap_t pmap, vm_page_t p)); 22890618Stmmstatic vm_page_t _pmap_allocpte __P((pmap_t pmap, unsigned ptepindex)); 22990618Stmmstatic unsigned * pmap_pte_quick __P((pmap_t pmap, vm_offset_t va)); 23090618Stmmstatic vm_page_t pmap_page_lookup __P((vm_object_t object, vm_pindex_t pindex)); 23190618Stmmstatic int pmap_unuse_pt __P((pmap_t, vm_offset_t, vm_page_t)); 23290618Stmmstatic vm_offset_t pmap_kmem_choose(vm_offset_t addr); 23390618Stmm 234167308Smariusstatic unsigned pdir4mb; 23590618Stmm 236133589Smarius/* 237152684Smarius * Routine: pmap_pte 238152684Smarius * Function: 239152684Smarius * Extract the page table entry associated 240152684Smarius * with the given map/virtual_address pair. 241152684Smarius */ 242152684Smarius 243133589SmariusPMAP_INLINE unsigned * 24490618Stmmpmap_pte(pmap, va) 24590618Stmm register pmap_t pmap; 24690618Stmm vm_offset_t va; 24790618Stmm{ 24890618Stmm unsigned *pdeaddr; 24990618Stmm 25090618Stmm if (pmap) { 25190618Stmm pdeaddr = (unsigned *) pmap_pde(pmap, va); 25290618Stmm if (*pdeaddr & PG_PS) 25390618Stmm return pdeaddr; 25490618Stmm if (*pdeaddr) { 25590618Stmm return get_ptbase(pmap) + i386_btop(va); 25690618Stmm } 25790618Stmm } 25890618Stmm return (0); 25990618Stmm} 260146391Smarius 261146391Smarius/* 262146391Smarius * Move the kernel virtual free pointer to the next 263146391Smarius * 4MB. This is used to help improve performance 264146391Smarius * by using a large (4MB) page for much of the kernel 265146391Smarius * (.text, .data, .bss) 26690618Stmm */ 267146391Smariusstatic vm_offset_t 268146391Smariuspmap_kmem_choose(vm_offset_t addr) { 269146391Smarius vm_offset_t newaddr = addr; 270146391Smarius#ifndef DISABLE_PSE 271146391Smarius if (cpu_feature & CPUID_PSE) { 272146391Smarius newaddr = (addr + (NBPDR - 1)) & ~(NBPDR - 1); 273146391Smarius } 274146391Smarius#endif 275146391Smarius return newaddr; 276146391Smarius} 277146391Smarius 278146391Smarius/* 279146391Smarius * Bootstrap the system enough to run with virtual memory. 280146391Smarius * 28190618Stmm * On the i386 this is called after mapping has already been enabled 28290618Stmm * and just syncs the pmap module with what has already been done. 283167308Smarius * [We can't call it easily with mapping off since the kernel is not 284145186Smarius * mapped with PA == VA, hence we would have to relocate every address 285167308Smarius * from the linked base (virtual) address "KERNBASE" to the actual 286145186Smarius * (physical) address starting relative to 0] 287167308Smarius */ 288145186Smariusvoid 289145186Smariuspmap_bootstrap(firstaddr, loadaddr) 290145186Smarius vm_offset_t firstaddr; 291145186Smarius vm_offset_t loadaddr; 292145186Smarius{ 293145186Smarius vm_offset_t va; 294145186Smarius pt_entry_t *pte; 295145186Smarius#ifdef SMP 296145185Smarius int i, j; 29790618Stmm#endif 29890618Stmm 29990618Stmm avail_start = firstaddr; 300167308Smarius 30190618Stmm /* 30290618Stmm * XXX The calculation of virtual_avail is wrong. It's NKPT*PAGE_SIZE too 30390618Stmm * large. It should instead be correctly calculated in locore.s and 304152684Smarius * not based on 'first' (which is a physical address, not a virtual 305145185Smarius * address, for the start of unused physical memory). The kernel 30690618Stmm * page tables are NOT double mapped and thus should not be included 307167308Smarius * in this calculation. 30890618Stmm */ 309145185Smarius virtual_avail = (vm_offset_t) KERNBASE + firstaddr; 310167308Smarius virtual_avail = pmap_kmem_choose(virtual_avail); 311145185Smarius 31290618Stmm virtual_end = VM_MAX_KERNEL_ADDRESS; 313167308Smarius 314167308Smarius /* 315167308Smarius * Initialize protection array. 316145185Smarius */ 31790618Stmm i386_protection_init(); 31890618Stmm 31990618Stmm /* 32090618Stmm * The kernel's pmap is statically allocated so we don't have to use 321145185Smarius * pmap_create, which is unlikely to work correctly at this part of 322146391Smarius * the boot sequence (XXX and which no longer exists). 32390618Stmm */ 32490618Stmm kernel_pmap = &kernel_pmap_store; 32590618Stmm 32690618Stmm kernel_pmap->pm_pdir = (pd_entry_t *) (KERNBASE + (u_int)IdlePTD); 32790618Stmm kernel_pmap->pm_count = 1; 32890618Stmm kernel_pmap->pm_active = -1; /* don't allow deactivation */ 32990618Stmm TAILQ_INIT(&kernel_pmap->pm_pvlist); 33090618Stmm nkpt = NKPT; 33190618Stmm 33290618Stmm /* 33390618Stmm * Reserve some special page table entries/VA space for temporary 33490618Stmm * mapping of pages. 33590618Stmm */ 33690618Stmm#define SYSMAP(c, p, v, n) \ 33790618Stmm v = (c)va; va += ((n)*PAGE_SIZE); p = pte; pte += (n); 33890618Stmm 33990618Stmm va = virtual_avail; 340145185Smarius pte = (pt_entry_t *) pmap_pte(kernel_pmap, va); 34190618Stmm 34290618Stmm /* 34390618Stmm * CMAP1/CMAP2 are used for zeroing and copying pages. 34490618Stmm */ 345145185Smarius SYSMAP(caddr_t, CMAP1, CADDR1, 1) 34690618Stmm SYSMAP(caddr_t, CMAP2, CADDR2, 1) 34790618Stmm 34890618Stmm /* 34990618Stmm * ptvmmap is used for reading arbitrary physical pages via /dev/mem. 350167308Smarius * XXX ptmmap is not used. 35190618Stmm */ 35290618Stmm SYSMAP(caddr_t, ptmmap, ptvmmap, 1) 35390618Stmm 35490618Stmm /* 35590618Stmm * msgbufp is used to map the system message buffer. 35690618Stmm * XXX msgbufmap is not used. 357167308Smarius */ 358167308Smarius SYSMAP(struct msgbuf *, msgbufmap, msgbufp, 359167308Smarius atop(round_page(MSGBUF_SIZE))) 360167308Smarius 361145185Smarius#if !defined(SMP) 36290618Stmm /* 36390618Stmm * ptemap is used for pmap_pte_quick 36490618Stmm */ 36590618Stmm SYSMAP(unsigned *, PMAP1, PADDR1, 1); 36690618Stmm#endif 367145185Smarius 36890618Stmm virtual_avail = va; 36990618Stmm 37090618Stmm *(int *) CMAP1 = *(int *) CMAP2 = 0; 37190618Stmm *(int *) PTD = 0; 37290618Stmm 37390618Stmm 37490618Stmm pgeflag = 0; 37590618Stmm#if !defined(SMP) 37690618Stmm if (cpu_feature & CPUID_PGE) { 37790618Stmm pgeflag = PG_G; 37890618Stmm } 37990618Stmm#endif 38090618Stmm 38190618Stmm/* 38290618Stmm * Initialize the 4MB page size flag 38390618Stmm */ 38490618Stmm pseflag = 0; 38590618Stmm/* 38690618Stmm * The 4MB page version of the initial 38790618Stmm * kernel page mapping. 38890618Stmm */ 38990618Stmm pdir4mb = 0; 39090618Stmm 39190618Stmm#if !defined(DISABLE_PSE) 39290618Stmm if (cpu_feature & CPUID_PSE) { 39390618Stmm unsigned ptditmp; 394123865Sobrien /* 39590618Stmm * Enable the PSE mode 39690618Stmm */ 39790618Stmm load_cr4(rcr4() | CR4_PSE); 398145185Smarius 399145185Smarius /* 40090618Stmm * Note that we have enabled PSE mode 40190618Stmm */ 402100188Stmm pseflag = PG_PS; 403100188Stmm ptditmp = *((unsigned *)PTmap + i386_btop(KERNBASE)); 404100188Stmm ptditmp &= ~(NBPDR - 1); 405100188Stmm ptditmp |= PG_V | PG_RW | PG_PS | PG_U | pgeflag; 406100188Stmm pdir4mb = ptditmp; 407114484Stmm /* 40890618Stmm * We can do the mapping here for the single processor 409116213Stmm * case. We simply ignore the old page table page from 410167308Smarius * now on. 411167308Smarius */ 412167308Smarius#if !defined(SMP) 413145185Smarius PTD[KPTDI] = (pd_entry_t) ptditmp; 414116213Stmm kernel_pmap->pm_pdir[KPTDI] = (pd_entry_t) ptditmp; 415116213Stmm invltlb(); 416116541Stmm#endif 417116213Stmm } 418145185Smarius#endif 419167308Smarius 42090618Stmm#ifdef SMP 421167308Smarius if (cpu_apic_address == 0) 422167308Smarius panic("pmap_bootstrap: no local apic!"); 423166034Smarius 424167308Smarius /* 0 = private page */ 425166901Spiso /* 1 = page table page */ 426166901Spiso /* 2 = local apic */ 427166034Smarius /* 16-31 = io apics */ 428107477Stmm SMP_prvpt[2] = (pt_entry_t)(PG_V | PG_RW | pgeflag | 429167308Smarius (cpu_apic_address & PG_FRAME)); 43090618Stmm 431167308Smarius for (i = 0; i < mp_napics; i++) { 432167308Smarius for (j = 0; j < 16; j++) { 433166034Smarius /* same page frame as a previous IO apic? */ 434167308Smarius if (((vm_offset_t)SMP_prvpt[j + 16] & PG_FRAME) == 435166901Spiso (io_apic_address[0] & PG_FRAME)) { 436166901Spiso ioapic[i] = (ioapic_t *)&SMP_ioapic[j * PAGE_SIZE]; 437166034Smarius break; 438107477Stmm } 43990618Stmm /* use this slot if available */ 44090618Stmm if (((vm_offset_t)SMP_prvpt[j + 16] & PG_FRAME) == 0) { 44190618Stmm SMP_prvpt[j + 16] = (pt_entry_t)(PG_V | PG_RW | 44290618Stmm pgeflag | (io_apic_address[i] & PG_FRAME)); 44390618Stmm ioapic[i] = (ioapic_t *)&SMP_ioapic[j * PAGE_SIZE]; 44490618Stmm break; 44590618Stmm } 44690618Stmm } 44790618Stmm if (j == 16) 448152684Smarius panic("no space to map IO apic %d!", i); 44990618Stmm } 450146391Smarius 451146391Smarius /* BSP does this itself, AP's get it pre-set */ 452146391Smarius prv_CMAP1 = &SMP_prvpt[3 + UPAGES]; 453146391Smarius prv_CMAP2 = &SMP_prvpt[4 + UPAGES]; 454146391Smarius prv_CMAP3 = &SMP_prvpt[5 + UPAGES]; 455146391Smarius prv_PMAP1 = &SMP_prvpt[6 + UPAGES]; 456146391Smarius#endif 457146391Smarius 458146391Smarius invltlb(); 459146391Smarius 460146391Smarius} 461146391Smarius 462152684Smarius/* 463152684Smarius * Set 4mb pdir for mp startup, and global flags 464152684Smarius */ 465152684Smariusvoid 466152684Smariuspmap_set_opt(unsigned *pdir) { 467152684Smarius int i; 468152684Smarius 469152684Smarius if (pseflag && (cpu_feature & CPUID_PSE)) { 470152684Smarius load_cr4(rcr4() | CR4_PSE); 47190618Stmm if (pdir4mb) { 47290618Stmm pdir[KPTDI] = pdir4mb; 473145186Smarius } 47490618Stmm } 47590618Stmm 47690618Stmm if (pgeflag && (cpu_feature & CPUID_PGE)) { 477152684Smarius load_cr4(rcr4() | CR4_PGE); 47890618Stmm for(i = KPTDI; i < KPTDI + nkpt; i++) { 47990618Stmm if (pdir[i]) { 48090618Stmm pdir[i] |= PG_G; 48190618Stmm } 48290618Stmm } 48390618Stmm } 484111119Simp} 485152684Smarius 486152684Smarius/* 48790618Stmm * Setup the PTD for the boot processor 488152684Smarius */ 48990618Stmmvoid 49090618Stmmpmap_set_opt_bsp(void) 49190618Stmm{ 49290618Stmm pmap_set_opt((unsigned *)kernel_pmap->pm_pdir); 493152684Smarius pmap_set_opt((unsigned *)PTD); 494152684Smarius invltlb(); 495152684Smarius} 496152684Smarius 497152684Smarius/* 49890618Stmm * Initialize the pmap module. 49990618Stmm * Called by vm_init, to initialize any structures that the pmap 50090618Stmm * system needs to map virtual memory. 50190618Stmm * pmap_init has been enhanced to support in a fairly consistant 50290618Stmm * way, discontiguous physical memory. 50390618Stmm */ 50490618Stmmvoid 50590618Stmmpmap_init(phys_start, phys_end) 50690618Stmm vm_offset_t phys_start, phys_end; 507152684Smarius{ 508152684Smarius vm_offset_t addr; 509152684Smarius vm_size_t s; 510152684Smarius int i; 511152684Smarius int initial_pvs; 512152684Smarius 51390618Stmm /* 51490618Stmm * object for kernel page table pages 51590618Stmm */ 51690618Stmm kptobj = vm_object_allocate(OBJT_DEFAULT, NKPDE); 51790618Stmm 51890618Stmm /* 51990618Stmm * calculate the number of pv_entries needed 52090618Stmm */ 52190618Stmm vm_first_phys = phys_avail[0]; 52290618Stmm for (i = 0; phys_avail[i + 1]; i += 2); 523145185Smarius pv_npg = (phys_avail[(i - 2) + 1] - vm_first_phys) / PAGE_SIZE; 52490618Stmm 525145185Smarius /* 526145185Smarius * Allocate memory for random pmap data structures. Includes the 52790618Stmm * pv_head_table. 52890618Stmm */ 52990618Stmm s = (vm_size_t) (sizeof(pv_table_t) * pv_npg); 53090618Stmm s = round_page(s); 531145185Smarius 53290618Stmm addr = (vm_offset_t) kmem_alloc(kernel_map, s); 53390618Stmm pv_table = (pv_table_t *) addr; 534107477Stmm for(i = 0; i < pv_npg; i++) { 53590618Stmm vm_offset_t pa; 53690618Stmm TAILQ_INIT(&pv_table[i].pv_list); 537146391Smarius pv_table[i].pv_list_count = 0; 53890618Stmm pa = vm_first_phys + i * PAGE_SIZE; 53990618Stmm pv_table[i].pv_vm_page = PHYS_TO_VM_PAGE(pa); 54090618Stmm } 54190618Stmm 54290618Stmm /* 54390618Stmm * init the pv free list 54490618Stmm */ 54590618Stmm initial_pvs = pv_npg; 54690618Stmm if (initial_pvs < MINPV) 54790618Stmm initial_pvs = MINPV; 548145186Smarius pvzone = &pvzone_store; 549145186Smarius pvinit = (struct pv_entry *) kmem_alloc(kernel_map, 550145186Smarius initial_pvs * sizeof (struct pv_entry)); 55190618Stmm zbootinit(pvzone, "PV ENTRY", sizeof (struct pv_entry), pvinit, pv_npg); 55290618Stmm 553152684Smarius /* 554152684Smarius * Now it is safe to enable pv_table recording. 555152684Smarius */ 556152684Smarius pmap_initialized = TRUE; 55790618Stmm} 55890618Stmm 55990618Stmm/* 56090618Stmm * Initialize the address space (zone) for the pv_entries. Set a 56190618Stmm * high water mark so that the system can recover from excessive 56290618Stmm * numbers of pv entries. 56390618Stmm */ 564152684Smariusvoid 56590618Stmmpmap_init2() { 56690618Stmm pv_entry_max = PMAP_SHPGPERPROC * maxproc + pv_npg; 56790618Stmm pv_entry_high_water = 9 * (pv_entry_max / 10); 56890618Stmm zinitna(pvzone, &pvzone_obj, NULL, 0, pv_entry_max, ZONE_INTERRUPT, 1); 56990618Stmm} 57090618Stmm 57190618Stmm/* 57290618Stmm * Used to map a range of physical addresses into kernel 57390618Stmm * virtual address space. 574152684Smarius * 57590618Stmm * For now, VM is already on, we only need to map the 57690618Stmm * specified memory. 57790618Stmm */ 57890618Stmmvm_offset_t 57990618Stmmpmap_map(virt, start, end, prot) 58090618Stmm vm_offset_t virt; 58190618Stmm vm_offset_t start; 582152684Smarius vm_offset_t end; 58390618Stmm int prot; 584152684Smarius{ 585152684Smarius while (start < end) { 586152684Smarius pmap_enter(kernel_pmap, virt, start, prot, FALSE); 587145186Smarius virt += PAGE_SIZE; 588152684Smarius start += PAGE_SIZE; 58990618Stmm } 59090618Stmm return (virt); 59190618Stmm} 59290618Stmm 59390618Stmm 594146391Smarius/*************************************************** 59590618Stmm * Low level helper routines..... 59690618Stmm ***************************************************/ 597146391Smarius 59890618Stmm#if defined(PMAP_DIAGNOSTIC) 59990618Stmm 60090618Stmm/* 60190618Stmm * This code checks for non-writeable/modified pages. 60290618Stmm * This should be an invalid condition. 60390618Stmm */ 60490618Stmmstatic int 605145186Smariuspmap_nw_modified(pt_entry_t ptea) { 60690618Stmm int pte; 607146391Smarius 608146391Smarius pte = (int) ptea; 609146391Smarius 61090618Stmm if ((pte & (PG_M|PG_RW)) == PG_M) 61190618Stmm return 1; 61290618Stmm else 61390618Stmm return 0; 61490618Stmm} 61590618Stmm#endif 616146391Smarius 61790618Stmm 61890618Stmm/* 61990618Stmm * this routine defines the region(s) of memory that should 62090618Stmm * not be tested for the modified bit. 62190618Stmm */ 62290618Stmmstatic PMAP_INLINE int 62390618Stmmpmap_track_modified( vm_offset_t va) { 62490618Stmm if ((va < clean_sva) || (va >= clean_eva)) 62590618Stmm return 1; 62690618Stmm else 62790618Stmm return 0; 62890618Stmm} 629166901Spiso 63090618Stmmstatic PMAP_INLINE void 63190618Stmminvltlb_1pg( vm_offset_t va) { 63290618Stmm#if defined(I386_CPU) 63390618Stmm if (cpu_class == CPUCLASS_386) { 63490618Stmm invltlb(); 63590618Stmm } else 63690618Stmm#endif 637166901Spiso { 63890618Stmm invlpg(va); 63990618Stmm } 64090618Stmm} 641145185Smarius 642166901Spisostatic __inline void 64390618Stmmpmap_TLB_invalidate(pmap_t pmap, vm_offset_t va) 64490618Stmm{ 64590618Stmm#if defined(SMP) 64690618Stmm if (pmap->pm_active & (1 << cpuid)) 64790618Stmm cpu_invlpg((void *)va); 64890618Stmm if (pmap->pm_active & other_cpus) 64990618Stmm smp_invltlb(); 650159413Smarius#else 65190618Stmm if (pmap->pm_active) 652166901Spiso invltlb_1pg(va); 653166901Spiso#endif 654145185Smarius} 65590618Stmm 65690618Stmmstatic __inline void 657159413Smariuspmap_TLB_invalidate_all(pmap_t pmap) 65890618Stmm{ 65990618Stmm#if defined(SMP) 660159413Smarius if (pmap->pm_active & (1 << cpuid)) 661107474Stmm cpu_invltlb(); 662107477Stmm if (pmap->pm_active & other_cpus) 663107474Stmm smp_invltlb(); 664145185Smarius#else 665107474Stmm if (pmap->pm_active) 666107474Stmm invltlb(); 667107474Stmm#endif 668107474Stmm} 669107474Stmm 670107474Stmmstatic unsigned * 671107474Stmmget_ptbase(pmap) 672146391Smarius pmap_t pmap; 673107474Stmm{ 674107474Stmm unsigned frame = (unsigned) pmap->pm_pdir[PTDPTDI] & PG_FRAME; 675107474Stmm 676146391Smarius /* are we current address space or kernel? */ 677107474Stmm if (pmap == kernel_pmap || frame == (((unsigned) PTDpde) & PG_FRAME)) { 678159413Smarius return (unsigned *) PTmap; 679159413Smarius } 680107474Stmm /* otherwise, we are alternate address space */ 681159413Smarius if (frame != (((unsigned) APTDpde) & PG_FRAME)) { 682107474Stmm APTDpde = (pd_entry_t) (frame | PG_RW | PG_V); 683107474Stmm#if defined(SMP) 684107474Stmm /* The page directory is not shared between CPUs */ 685107474Stmm cpu_invltlb(); 686107474Stmm#else 687145185Smarius invltlb(); 688107474Stmm#endif 68990618Stmm } 69090618Stmm return (unsigned *) APTmap; 69190618Stmm} 692166901Spiso 69390618Stmm/* 69490618Stmm * Super fast pmap_pte routine best used when scanning 695159413Smarius * the pv lists. This eliminates many coarse-grained 696166901Spiso * invltlb calls. Note that many of the pv list 697166901Spiso * scans are across different pmaps. It is very wasteful 698166901Spiso * to do an entire invltlb for checking a single mapping. 699166901Spiso */ 700166901Spiso 701166901Spisostatic unsigned * 702166901Spisopmap_pte_quick(pmap, va) 70390618Stmm register pmap_t pmap; 70490618Stmm vm_offset_t va; 70590618Stmm{ 70690618Stmm unsigned pde, newpf; 70790618Stmm if ((pde = (unsigned) pmap->pm_pdir[va >> PDRSHIFT]) != 0) { 70890618Stmm unsigned frame = (unsigned) pmap->pm_pdir[PTDPTDI] & PG_FRAME; 70990618Stmm unsigned index = i386_btop(va); 71090618Stmm /* are we current address space or kernel? */ 71190618Stmm if ((pmap == kernel_pmap) || 71290618Stmm (frame == (((unsigned) PTDpde) & PG_FRAME))) { 71390618Stmm return (unsigned *) PTmap + index; 714107474Stmm } 71590618Stmm newpf = pde & PG_FRAME; 716107477Stmm#ifdef SMP 717107477Stmm if ( ((* (unsigned *) prv_PMAP1) & PG_FRAME) != newpf) { 71890618Stmm * (unsigned *) prv_PMAP1 = newpf | PG_RW | PG_V; 719107477Stmm cpu_invlpg(&prv_PPAGE1); 72090618Stmm } 72190618Stmm return prv_PPAGE1 + ((unsigned) index & (NPTEPG - 1)); 72290618Stmm#else 72390618Stmm if ( ((* (unsigned *) PMAP1) & PG_FRAME) != newpf) { 724152684Smarius * (unsigned *) PMAP1 = newpf | PG_RW | PG_V; 725152684Smarius invltlb_1pg((vm_offset_t) PADDR1); 72690618Stmm } 72790618Stmm return PADDR1 + ((unsigned) index & (NPTEPG - 1)); 72890618Stmm#endif 72990618Stmm } 73090618Stmm return (0); 73190618Stmm} 73290618Stmm 73390618Stmm/* 734145185Smarius * Routine: pmap_extract 73590618Stmm * Function: 73690618Stmm * Extract the physical page address associated 73790618Stmm * with the given map/virtual_address pair. 73890618Stmm */ 73990618Stmmvm_offset_t 74090618Stmmpmap_extract(pmap, va) 74190618Stmm register pmap_t pmap; 74290618Stmm vm_offset_t va; 74390618Stmm{ 74490618Stmm vm_offset_t rtval; 74590618Stmm vm_offset_t pdirindex; 74690618Stmm pdirindex = va >> PDRSHIFT; 74790618Stmm if (pmap && (rtval = (unsigned) pmap->pm_pdir[pdirindex])) { 74890618Stmm unsigned *pte; 74990618Stmm if ((rtval & PG_PS) != 0) { 75090618Stmm rtval &= ~(NBPDR - 1); 751145186Smarius rtval |= va & (NBPDR - 1); 75290618Stmm return rtval; 75390618Stmm } 75490618Stmm pte = get_ptbase(pmap) + i386_btop(va); 755145186Smarius rtval = ((*pte & PG_FRAME) | (va & PAGE_MASK)); 756145186Smarius return rtval; 75790618Stmm } 758145185Smarius return 0; 759145185Smarius 760145186Smarius} 761145186Smarius 762145186Smarius/* 763145186Smarius * determine if a page is managed (memory vs. device) 76490618Stmm */ 76590618Stmmstatic PMAP_INLINE int 766145186Smariuspmap_is_managed(pa) 767145186Smarius vm_offset_t pa; 76890618Stmm{ 769145186Smarius int i; 770145186Smarius 771145186Smarius if (!pmap_initialized) 772145186Smarius return 0; 773145186Smarius 774145186Smarius for (i = 0; phys_avail[i + 1]; i += 2) { 775145186Smarius if (pa < phys_avail[i + 1] && pa >= phys_avail[i]) 776145186Smarius return 1; 777145186Smarius } 778145186Smarius return 0; 779145186Smarius} 780145186Smarius 78190618Stmm 78290618Stmm/*************************************************** 783145186Smarius * Low level mapping routines..... 784145186Smarius ***************************************************/ 785145186Smarius 786145186Smarius/* 78790618Stmm * add a wired page to the kva 788145186Smarius * note that in order for the mapping to take effect -- you 78990618Stmm * should do a invltlb after doing the pmap_kenter... 79090618Stmm */ 79190618StmmPMAP_INLINE void 79290618Stmmpmap_kenter(va, pa) 79390618Stmm vm_offset_t va; 79490618Stmm register vm_offset_t pa; 79590618Stmm{ 79690618Stmm register unsigned *pte; 79790618Stmm unsigned npte, opte; 79890618Stmm 79990618Stmm npte = pa | PG_RW | PG_V | pgeflag; 800159413Smarius pte = (unsigned *)vtopte(va); 80190618Stmm opte = *pte; 802159413Smarius *pte = npte; 80390618Stmm if (opte) 80490618Stmm invltlb_1pg(va); 80590618Stmm} 80690618Stmm 80790618Stmm/* 80890618Stmm * remove a page from the kernel pagetables 809157896Simp */ 81090618StmmPMAP_INLINE void 81190618Stmmpmap_kremove(va) 81290618Stmm vm_offset_t va; 81390618Stmm{ 81490618Stmm register unsigned *pte; 81590618Stmm 81690618Stmm pte = (unsigned *)vtopte(va); 81790618Stmm *pte = 0; 818145186Smarius invltlb_1pg(va); 819145186Smarius} 820145186Smarius 82190618Stmm/* 82290618Stmm * Add a list of wired pages to the kva 82390618Stmm * this routine is only used for temporary 82490618Stmm * kernel mappings that do not need to have 82590618Stmm * page modification or references recorded. 82690618Stmm * Note that old mappings are simply written 82790618Stmm * over. The page *must* be wired. 82890618Stmm */ 82990618Stmmvoid 830159413Smariuspmap_qenter(va, m, count) 831159413Smarius vm_offset_t va; 83290618Stmm vm_page_t *m; 833108798Stmm int count; 834108798Stmm{ 835108798Stmm int i; 836108798Stmm 837159413Smarius for (i = 0; i < count; i++) { 838159413Smarius vm_offset_t tva = va + i * PAGE_SIZE; 839159413Smarius pmap_kenter(tva, VM_PAGE_TO_PHYS(m[i])); 840159413Smarius } 841159413Smarius} 842159413Smarius 843159413Smarius/* 844159413Smarius * this routine jerks page mappings from the 845159413Smarius * kernel -- it is meant only for temporary mappings. 846159413Smarius */ 847159413Smariusvoid 84890618Stmmpmap_qremove(va, count) 84990618Stmm vm_offset_t va; 85090618Stmm int count; 85190618Stmm{ 85290618Stmm int i; 85390618Stmm 85490618Stmm for (i = 0; i < count; i++) { 85590618Stmm pmap_kremove(va); 856108798Stmm va += PAGE_SIZE; 857108798Stmm } 858108798Stmm} 859108798Stmm 860159413Smariusstatic vm_page_t 861159413Smariuspmap_page_lookup(object, pindex) 862159413Smarius vm_object_t object; 863159413Smarius vm_pindex_t pindex; 86490618Stmm{ 86590618Stmm vm_page_t m; 86690618Stmmretry: 86790618Stmm m = vm_page_lookup(object, pindex); 86890618Stmm if (m && vm_page_sleep_busy(m, FALSE, "pplookp")) 86990618Stmm goto retry; 87090618Stmm return m; 871145186Smarius} 872108798Stmm 873145186Smarius/* 87490618Stmm * Create the UPAGES for a new process. 875145186Smarius * This routine directly affects the fork perf for a process. 876145186Smarius */ 87790618Stmmvoid 878145186Smariuspmap_new_proc(p) 879145186Smarius struct proc *p; 880145186Smarius{ 881108798Stmm int i, updateneeded; 882108798Stmm vm_object_t upobj; 88390618Stmm vm_page_t m; 884145186Smarius struct user *up; 885145186Smarius unsigned *ptek, oldpte; 886108798Stmm 887145186Smarius /* 888108798Stmm * allocate object for the upages 889145185Smarius */ 890108798Stmm if ((upobj = p->p_upages_obj) == NULL) { 891145185Smarius upobj = vm_object_allocate( OBJT_DEFAULT, UPAGES); 892108798Stmm p->p_upages_obj = upobj; 893108798Stmm } 89490618Stmm 89590618Stmm /* get a kernel virtual address for the UPAGES for this proc */ 896167308Smarius if ((up = p->p_addr) == NULL) { 897167308Smarius up = (struct user *) kmem_alloc_pageable(kernel_map, 898167308Smarius UPAGES * PAGE_SIZE); 899167308Smarius#if !defined(MAX_PERF) 900167308Smarius if (up == NULL) 901167308Smarius panic("pmap_new_proc: u_map allocation failed"); 902167308Smarius#endif 903167308Smarius p->p_addr = up; 904167308Smarius } 905152684Smarius 906152684Smarius ptek = (unsigned *) vtopte((vm_offset_t) up); 907152684Smarius 908152684Smarius updateneeded = 0; 909152684Smarius for(i=0;i<UPAGES;i++) { 910152684Smarius /* 911152684Smarius * Get a kernel stack page 912152684Smarius */ 913152684Smarius m = vm_page_grab(upobj, i, VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 91490618Stmm 91590618Stmm /* 91690618Stmm * Wire the page 91790618Stmm */ 91890618Stmm m->wire_count++; 91990618Stmm cnt.v_wire_count++; 92090618Stmm 92190618Stmm oldpte = *(ptek + i); 922166901Spiso /* 92390618Stmm * Enter the page into the kernel address space. 92490618Stmm */ 92590618Stmm *(ptek + i) = VM_PAGE_TO_PHYS(m) | PG_RW | PG_V | pgeflag; 92690618Stmm if (oldpte) { 92790618Stmm if ((oldpte & PG_G) || (cpu_class > CPUCLASS_386)) { 928166901Spiso invlpg((vm_offset_t) up + i * PAGE_SIZE); 92990618Stmm } else { 93090618Stmm updateneeded = 1; 93190618Stmm } 932166901Spiso } 93390618Stmm 93490618Stmm vm_page_wakeup(m); 93590618Stmm vm_page_flag_clear(m, PG_ZERO); 93690618Stmm vm_page_flag_set(m, PG_MAPPED | PG_WRITEABLE); 93790618Stmm m->valid = VM_PAGE_BITS_ALL; 938166901Spiso } 93990618Stmm if (updateneeded) 94090618Stmm invltlb(); 94190618Stmm} 94290618Stmm 94390618Stmm/* 94490618Stmm * Dispose the UPAGES for a process that has exited. 94590618Stmm * This routine directly impacts the exit perf of a process. 94690618Stmm */ 94790618Stmmvoid 94890618Stmmpmap_dispose_proc(p) 949145185Smarius struct proc *p; 95090618Stmm{ 951108815Stmm int i; 952108815Stmm vm_object_t upobj; 953108815Stmm vm_page_t m; 95490618Stmm unsigned *ptek, oldpte; 95590618Stmm 956133589Smarius upobj = p->p_upages_obj; 957152684Smarius 958152684Smarius ptek = (unsigned *) vtopte((vm_offset_t) p->p_addr); 959133589Smarius for(i=0;i<UPAGES;i++) { 960152684Smarius 961133589Smarius if ((m = vm_page_lookup(upobj, i)) == NULL) 962152684Smarius panic("pmap_dispose_proc: upage already missing???"); 963152684Smarius 964152684Smarius vm_page_busy(m); 965152684Smarius 966152684Smarius oldpte = *(ptek + i); 967152684Smarius *(ptek + i) = 0; 968133589Smarius if ((oldpte & PG_G) || (cpu_class > CPUCLASS_386)) 969 invlpg((vm_offset_t) p->p_addr + i * PAGE_SIZE); 970 vm_page_unwire(m, 0); 971 vm_page_free(m); 972 } 973 974 if (cpu_class <= CPUCLASS_386) 975 invltlb(); 976} 977 978/* 979 * Allow the UPAGES for a process to be prejudicially paged out. 980 */ 981void 982pmap_swapout_proc(p) 983 struct proc *p; 984{ 985 int i; 986 vm_object_t upobj; 987 vm_page_t m; 988 989 upobj = p->p_upages_obj; 990 /* 991 * let the upages be paged 992 */ 993 for(i=0;i<UPAGES;i++) { 994 if ((m = vm_page_lookup(upobj, i)) == NULL) 995 panic("pmap_swapout_proc: upage already missing???"); 996 vm_page_dirty(m); 997 vm_page_unwire(m, 0); 998 pmap_kremove( (vm_offset_t) p->p_addr + PAGE_SIZE * i); 999 } 1000} 1001 1002/* 1003 * Bring the UPAGES for a specified process back in. 1004 */ 1005void 1006pmap_swapin_proc(p) 1007 struct proc *p; 1008{ 1009 int i,rv; 1010 vm_object_t upobj; 1011 vm_page_t m; 1012 1013 upobj = p->p_upages_obj; 1014 for(i=0;i<UPAGES;i++) { 1015 1016 m = vm_page_grab(upobj, i, VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 1017 1018 pmap_kenter(((vm_offset_t) p->p_addr) + i * PAGE_SIZE, 1019 VM_PAGE_TO_PHYS(m)); 1020 1021 if (m->valid != VM_PAGE_BITS_ALL) { 1022 rv = vm_pager_get_pages(upobj, &m, 1, 0); 1023#if !defined(MAX_PERF) 1024 if (rv != VM_PAGER_OK) 1025 panic("pmap_swapin_proc: cannot get upages for proc: %d\n", p->p_pid); 1026#endif 1027 m = vm_page_lookup(upobj, i); 1028 m->valid = VM_PAGE_BITS_ALL; 1029 } 1030 1031 vm_page_wire(m); 1032 vm_page_wakeup(m); 1033 vm_page_flag_set(m, PG_MAPPED | PG_WRITEABLE); 1034 } 1035} 1036 1037/*************************************************** 1038 * Page table page management routines..... 1039 ***************************************************/ 1040 1041/* 1042 * This routine unholds page table pages, and if the hold count 1043 * drops to zero, then it decrements the wire count. 1044 */ 1045static int 1046_pmap_unwire_pte_hold(pmap_t pmap, vm_page_t m) { 1047 1048 while (vm_page_sleep_busy(m, FALSE, "pmuwpt")) 1049 ; 1050 1051 if (m->hold_count == 0) { 1052 vm_offset_t pteva; 1053 /* 1054 * unmap the page table page 1055 */ 1056 pmap->pm_pdir[m->pindex] = 0; 1057 --pmap->pm_stats.resident_count; 1058 if ((((unsigned)pmap->pm_pdir[PTDPTDI]) & PG_FRAME) == 1059 (((unsigned) PTDpde) & PG_FRAME)) { 1060 /* 1061 * Do a invltlb to make the invalidated mapping 1062 * take effect immediately. 1063 */ 1064 pteva = UPT_MIN_ADDRESS + i386_ptob(m->pindex); 1065 pmap_TLB_invalidate(pmap, pteva); 1066 } 1067 1068 if (pmap->pm_ptphint == m) 1069 pmap->pm_ptphint = NULL; 1070 1071 /* 1072 * If the page is finally unwired, simply free it. 1073 */ 1074 --m->wire_count; 1075 if (m->wire_count == 0) { 1076 1077 vm_page_flash(m); 1078 vm_page_busy(m); 1079 vm_page_free_zero(m); 1080 --cnt.v_wire_count; 1081 } 1082 return 1; 1083 } 1084 return 0; 1085} 1086 1087static PMAP_INLINE int 1088pmap_unwire_pte_hold(pmap_t pmap, vm_page_t m) { 1089 vm_page_unhold(m); 1090 if (m->hold_count == 0) 1091 return _pmap_unwire_pte_hold(pmap, m); 1092 else 1093 return 0; 1094} 1095 1096/* 1097 * After removing a page table entry, this routine is used to 1098 * conditionally free the page, and manage the hold/wire counts. 1099 */ 1100static int 1101pmap_unuse_pt(pmap, va, mpte) 1102 pmap_t pmap; 1103 vm_offset_t va; 1104 vm_page_t mpte; 1105{ 1106 unsigned ptepindex; 1107 if (va >= UPT_MIN_ADDRESS) 1108 return 0; 1109 1110 if (mpte == NULL) { 1111 ptepindex = (va >> PDRSHIFT); 1112 if (pmap->pm_ptphint && 1113 (pmap->pm_ptphint->pindex == ptepindex)) { 1114 mpte = pmap->pm_ptphint; 1115 } else { 1116 mpte = pmap_page_lookup( pmap->pm_pteobj, ptepindex); 1117 pmap->pm_ptphint = mpte; 1118 } 1119 } 1120 1121 return pmap_unwire_pte_hold(pmap, mpte); 1122} 1123 1124#if !defined(SMP) 1125void 1126pmap_pinit0(pmap) 1127 struct pmap *pmap; 1128{ 1129 pmap->pm_pdir = 1130 (pd_entry_t *)kmem_alloc_pageable(kernel_map, PAGE_SIZE); 1131 pmap_kenter((vm_offset_t) pmap->pm_pdir, (vm_offset_t) IdlePTD); 1132 pmap->pm_count = 1; 1133 pmap->pm_active = 0; 1134 pmap->pm_ptphint = NULL; 1135 TAILQ_INIT(&pmap->pm_pvlist); 1136 bzero(&pmap->pm_stats, sizeof pmap->pm_stats); 1137} 1138#else 1139void 1140pmap_pinit0(pmap) 1141 struct pmap *pmap; 1142{ 1143 pmap_pinit(pmap); 1144} 1145#endif 1146 1147/* 1148 * Initialize a preallocated and zeroed pmap structure, 1149 * such as one in a vmspace structure. 1150 */ 1151void 1152pmap_pinit(pmap) 1153 register struct pmap *pmap; 1154{ 1155 vm_page_t ptdpg; 1156 1157 /* 1158 * No need to allocate page table space yet but we do need a valid 1159 * page directory table. 1160 */ 1161 if (pmap->pm_pdir == NULL) 1162 pmap->pm_pdir = 1163 (pd_entry_t *)kmem_alloc_pageable(kernel_map, PAGE_SIZE); 1164 1165 /* 1166 * allocate object for the ptes 1167 */ 1168 if (pmap->pm_pteobj == NULL) 1169 pmap->pm_pteobj = vm_object_allocate( OBJT_DEFAULT, PTDPTDI + 1); 1170 1171 /* 1172 * allocate the page directory page 1173 */ 1174 ptdpg = vm_page_grab( pmap->pm_pteobj, PTDPTDI, 1175 VM_ALLOC_NORMAL | VM_ALLOC_RETRY); 1176 1177 ptdpg->wire_count = 1; 1178 ++cnt.v_wire_count; 1179 1180 1181 vm_page_flag_clear(ptdpg, PG_MAPPED | PG_BUSY); /* not usually mapped*/ 1182 ptdpg->valid = VM_PAGE_BITS_ALL; 1183 1184 pmap_kenter((vm_offset_t) pmap->pm_pdir, VM_PAGE_TO_PHYS(ptdpg)); 1185 if ((ptdpg->flags & PG_ZERO) == 0) 1186 bzero(pmap->pm_pdir, PAGE_SIZE); 1187 1188 /* wire in kernel global address entries */ 1189 /* XXX copies current process, does not fill in MPPTDI */ 1190 bcopy(PTD + KPTDI, pmap->pm_pdir + KPTDI, nkpt * PTESIZE); 1191 1192 /* install self-referential address mapping entry */ 1193 *(unsigned *) (pmap->pm_pdir + PTDPTDI) = 1194 VM_PAGE_TO_PHYS(ptdpg) | PG_V | PG_RW | PG_A | PG_M; 1195 1196 pmap->pm_count = 1; 1197 pmap->pm_active = 0; 1198 pmap->pm_ptphint = NULL; 1199 TAILQ_INIT(&pmap->pm_pvlist); 1200 bzero(&pmap->pm_stats, sizeof pmap->pm_stats); 1201} 1202 1203static int 1204pmap_release_free_page(pmap, p) 1205 struct pmap *pmap; 1206 vm_page_t p; 1207{ 1208 unsigned *pde = (unsigned *) pmap->pm_pdir; 1209 /* 1210 * This code optimizes the case of freeing non-busy 1211 * page-table pages. Those pages are zero now, and 1212 * might as well be placed directly into the zero queue. 1213 */ 1214 if (vm_page_sleep_busy(p, FALSE, "pmaprl")) 1215 return 0; 1216 1217 vm_page_busy(p); 1218 1219 /* 1220 * Remove the page table page from the processes address space. 1221 */ 1222 pde[p->pindex] = 0; 1223 pmap->pm_stats.resident_count--; 1224 1225#if !defined(MAX_PERF) 1226 if (p->hold_count) { 1227 panic("pmap_release: freeing held page table page"); 1228 } 1229#endif 1230 /* 1231 * Page directory pages need to have the kernel 1232 * stuff cleared, so they can go into the zero queue also. 1233 */ 1234 if (p->pindex == PTDPTDI) { 1235 bzero(pde + KPTDI, nkpt * PTESIZE); 1236#ifdef SMP 1237 pde[MPPTDI] = 0; 1238#endif 1239 pde[APTDPTDI] = 0; 1240 pmap_kremove((vm_offset_t) pmap->pm_pdir); 1241 } 1242 1243 if (pmap->pm_ptphint && (pmap->pm_ptphint->pindex == p->pindex)) 1244 pmap->pm_ptphint = NULL; 1245 1246 p->wire_count--; 1247 cnt.v_wire_count--; 1248 vm_page_free_zero(p); 1249 return 1; 1250} 1251 1252/* 1253 * this routine is called if the page table page is not 1254 * mapped correctly. 1255 */ 1256static vm_page_t 1257_pmap_allocpte(pmap, ptepindex) 1258 pmap_t pmap; 1259 unsigned ptepindex; 1260{ 1261 vm_offset_t pteva, ptepa; 1262 vm_page_t m; 1263 1264 /* 1265 * Find or fabricate a new pagetable page 1266 */ 1267 m = vm_page_grab(pmap->pm_pteobj, ptepindex, 1268 VM_ALLOC_ZERO | VM_ALLOC_RETRY); 1269 1270 if (m->queue != PQ_NONE) { 1271 int s = splvm(); 1272 vm_page_unqueue(m); 1273 splx(s); 1274 } 1275 1276 if (m->wire_count == 0) 1277 cnt.v_wire_count++; 1278 m->wire_count++; 1279 1280 /* 1281 * Increment the hold count for the page table page 1282 * (denoting a new mapping.) 1283 */ 1284 m->hold_count++; 1285 1286 /* 1287 * Map the pagetable page into the process address space, if 1288 * it isn't already there. 1289 */ 1290 1291 pmap->pm_stats.resident_count++; 1292 1293 ptepa = VM_PAGE_TO_PHYS(m); 1294 pmap->pm_pdir[ptepindex] = 1295 (pd_entry_t) (ptepa | PG_U | PG_RW | PG_V | PG_A | PG_M); 1296 1297 /* 1298 * Set the page table hint 1299 */ 1300 pmap->pm_ptphint = m; 1301 1302 /* 1303 * Try to use the new mapping, but if we cannot, then 1304 * do it with the routine that maps the page explicitly. 1305 */ 1306 if ((m->flags & PG_ZERO) == 0) { 1307 if ((((unsigned)pmap->pm_pdir[PTDPTDI]) & PG_FRAME) == 1308 (((unsigned) PTDpde) & PG_FRAME)) { 1309 pteva = UPT_MIN_ADDRESS + i386_ptob(ptepindex); 1310 bzero((caddr_t) pteva, PAGE_SIZE); 1311 } else { 1312 pmap_zero_page(ptepa); 1313 } 1314 } 1315 1316 m->valid = VM_PAGE_BITS_ALL; 1317 vm_page_flag_clear(m, PG_ZERO); 1318 vm_page_flag_set(m, PG_MAPPED); 1319 vm_page_wakeup(m); 1320 1321 return m; 1322} 1323 1324static vm_page_t 1325pmap_allocpte(pmap, va) 1326 pmap_t pmap; 1327 vm_offset_t va; 1328{ 1329 unsigned ptepindex; 1330 vm_offset_t ptepa; 1331 vm_page_t m; 1332 1333 /* 1334 * Calculate pagetable page index 1335 */ 1336 ptepindex = va >> PDRSHIFT; 1337 1338 /* 1339 * Get the page directory entry 1340 */ 1341 ptepa = (vm_offset_t) pmap->pm_pdir[ptepindex]; 1342 1343 /* 1344 * This supports switching from a 4MB page to a 1345 * normal 4K page. 1346 */ 1347 if (ptepa & PG_PS) { 1348 pmap->pm_pdir[ptepindex] = 0; 1349 ptepa = 0; 1350 invltlb(); 1351 } 1352 1353 /* 1354 * If the page table page is mapped, we just increment the 1355 * hold count, and activate it. 1356 */ 1357 if (ptepa) { 1358 /* 1359 * In order to get the page table page, try the 1360 * hint first. 1361 */ 1362 if (pmap->pm_ptphint && 1363 (pmap->pm_ptphint->pindex == ptepindex)) { 1364 m = pmap->pm_ptphint; 1365 } else { 1366 m = pmap_page_lookup( pmap->pm_pteobj, ptepindex); 1367 pmap->pm_ptphint = m; 1368 } 1369 m->hold_count++; 1370 return m; 1371 } 1372 /* 1373 * Here if the pte page isn't mapped, or if it has been deallocated. 1374 */ 1375 return _pmap_allocpte(pmap, ptepindex); 1376} 1377 1378 1379/*************************************************** 1380* Pmap allocation/deallocation routines. 1381 ***************************************************/ 1382 1383/* 1384 * Release any resources held by the given physical map. 1385 * Called when a pmap initialized by pmap_pinit is being released. 1386 * Should only be called if the map contains no valid mappings. 1387 */ 1388void 1389pmap_release(pmap) 1390 register struct pmap *pmap; 1391{ 1392 vm_page_t p,n,ptdpg; 1393 vm_object_t object = pmap->pm_pteobj; 1394 int curgeneration; 1395 1396#if defined(DIAGNOSTIC) 1397 if (object->ref_count != 1) 1398 panic("pmap_release: pteobj reference count != 1"); 1399#endif 1400 1401 ptdpg = NULL; 1402retry: 1403 curgeneration = object->generation; 1404 for (p = TAILQ_FIRST(&object->memq); p != NULL; p = n) { 1405 n = TAILQ_NEXT(p, listq); 1406 if (p->pindex == PTDPTDI) { 1407 ptdpg = p; 1408 continue; 1409 } 1410 while (1) { 1411 if (!pmap_release_free_page(pmap, p) && 1412 (object->generation != curgeneration)) 1413 goto retry; 1414 } 1415 } 1416 1417 if (ptdpg && !pmap_release_free_page(pmap, ptdpg)) 1418 goto retry; 1419} 1420 1421/* 1422 * grow the number of kernel page table entries, if needed 1423 */ 1424void 1425pmap_growkernel(vm_offset_t addr) 1426{ 1427 struct proc *p; 1428 struct pmap *pmap; 1429 int s; 1430 vm_offset_t ptppaddr; 1431 vm_page_t nkpg; 1432#ifdef SMP 1433 int i; 1434#endif 1435 pd_entry_t newpdir; 1436 1437 s = splhigh(); 1438 if (kernel_vm_end == 0) { 1439 kernel_vm_end = KERNBASE; 1440 nkpt = 0; 1441 while (pdir_pde(PTD, kernel_vm_end)) { 1442 kernel_vm_end = (kernel_vm_end + PAGE_SIZE * NPTEPG) & ~(PAGE_SIZE * NPTEPG - 1); 1443 nkpt++; 1444 } 1445 } 1446 addr = (addr + PAGE_SIZE * NPTEPG) & ~(PAGE_SIZE * NPTEPG - 1); 1447 while (kernel_vm_end < addr) { 1448 if (pdir_pde(PTD, kernel_vm_end)) { 1449 kernel_vm_end = (kernel_vm_end + PAGE_SIZE * NPTEPG) & ~(PAGE_SIZE * NPTEPG - 1); 1450 continue; 1451 } 1452 1453 /* 1454 * This index is bogus, but out of the way 1455 */ 1456 nkpg = vm_page_alloc(kptobj, nkpt, VM_ALLOC_SYSTEM); 1457#if !defined(MAX_PERF) 1458 if (!nkpg) 1459 panic("pmap_growkernel: no memory to grow kernel"); 1460#endif 1461 1462 nkpt++; 1463 1464 vm_page_wire(nkpg); 1465 ptppaddr = VM_PAGE_TO_PHYS(nkpg); 1466 pmap_zero_page(ptppaddr); 1467 newpdir = (pd_entry_t) (ptppaddr | PG_V | PG_RW | PG_A | PG_M); 1468 pdir_pde(PTD, kernel_vm_end) = newpdir; 1469 1470#ifdef SMP 1471 for (i = 0; i < mp_ncpus; i++) { 1472 if (IdlePTDS[i]) 1473 pdir_pde(IdlePTDS[i], kernel_vm_end) = newpdir; 1474 } 1475#endif 1476 1477 for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) { 1478 if (p->p_vmspace) { 1479 pmap = vmspace_pmap(p->p_vmspace); 1480 *pmap_pde(pmap, kernel_vm_end) = newpdir; 1481 } 1482 } 1483 if (aiovmspace != NULL) { 1484 pmap = vmspace_pmap(aiovmspace); 1485 *pmap_pde(pmap, kernel_vm_end) = newpdir; 1486 } 1487 *pmap_pde(kernel_pmap, kernel_vm_end) = newpdir; 1488 kernel_vm_end = (kernel_vm_end + PAGE_SIZE * NPTEPG) & ~(PAGE_SIZE * NPTEPG - 1); 1489 } 1490 splx(s); 1491} 1492 1493/* 1494 * Retire the given physical map from service. 1495 * Should only be called if the map contains 1496 * no valid mappings. 1497 */ 1498void 1499pmap_destroy(pmap) 1500 register pmap_t pmap; 1501{ 1502 int count; 1503 1504 if (pmap == NULL) 1505 return; 1506 1507 count = --pmap->pm_count; 1508 if (count == 0) { 1509 pmap_release(pmap); 1510#if !defined(MAX_PERF) 1511 panic("destroying a pmap is not yet implemented"); 1512#endif 1513 } 1514} 1515 1516/* 1517 * Add a reference to the specified pmap. 1518 */ 1519void 1520pmap_reference(pmap) 1521 pmap_t pmap; 1522{ 1523 if (pmap != NULL) { 1524 pmap->pm_count++; 1525 } 1526} 1527 1528/*************************************************** 1529* page management routines. 1530 ***************************************************/ 1531 1532/* 1533 * free the pv_entry back to the free list 1534 */ 1535static PMAP_INLINE void 1536free_pv_entry(pv) 1537 pv_entry_t pv; 1538{ 1539 pv_entry_count--; 1540 zfreei(pvzone, pv); 1541} 1542 1543/* 1544 * get a new pv_entry, allocating a block from the system 1545 * when needed. 1546 * the memory allocation is performed bypassing the malloc code 1547 * because of the possibility of allocations at interrupt time. 1548 */ 1549static pv_entry_t 1550get_pv_entry(void) 1551{ 1552 pv_entry_count++; 1553 if (pv_entry_high_water && 1554 (pv_entry_count > pv_entry_high_water) && 1555 (pmap_pagedaemon_waken == 0)) { 1556 pmap_pagedaemon_waken = 1; 1557 wakeup (&vm_pages_needed); 1558 } 1559 return zalloci(pvzone); 1560} 1561 1562/* 1563 * This routine is very drastic, but can save the system 1564 * in a pinch. 1565 */ 1566void 1567pmap_collect() { 1568 pv_table_t *ppv; 1569 int i; 1570 vm_offset_t pa; 1571 vm_page_t m; 1572 static int warningdone=0; 1573 1574 if (pmap_pagedaemon_waken == 0) 1575 return; 1576 1577 if (warningdone < 5) { 1578 printf("pmap_collect: collecting pv entries -- suggest increasing PMAP_SHPGPERPROC\n"); 1579 warningdone++; 1580 } 1581 1582 for(i = 0; i < pv_npg; i++) { 1583 if ((ppv = &pv_table[i]) == 0) 1584 continue; 1585 m = ppv->pv_vm_page; 1586 if ((pa = VM_PAGE_TO_PHYS(m)) == 0) 1587 continue; 1588 if (m->wire_count || m->hold_count || m->busy || 1589 (m->flags & PG_BUSY)) 1590 continue; 1591 pmap_remove_all(pa); 1592 } 1593 pmap_pagedaemon_waken = 0; 1594} 1595 1596 1597/* 1598 * If it is the first entry on the list, it is actually 1599 * in the header and we must copy the following entry up 1600 * to the header. Otherwise we must search the list for 1601 * the entry. In either case we free the now unused entry. 1602 */ 1603 1604static int 1605pmap_remove_entry(pmap, ppv, va) 1606 struct pmap *pmap; 1607 pv_table_t *ppv; 1608 vm_offset_t va; 1609{ 1610 pv_entry_t pv; 1611 int rtval; 1612 int s; 1613 1614 s = splvm(); 1615 if (ppv->pv_list_count < pmap->pm_stats.resident_count) { 1616 for (pv = TAILQ_FIRST(&ppv->pv_list); 1617 pv; 1618 pv = TAILQ_NEXT(pv, pv_list)) { 1619 if (pmap == pv->pv_pmap && va == pv->pv_va) 1620 break; 1621 } 1622 } else { 1623 for (pv = TAILQ_FIRST(&pmap->pm_pvlist); 1624 pv; 1625 pv = TAILQ_NEXT(pv, pv_plist)) { 1626 if (va == pv->pv_va) 1627 break; 1628 } 1629 } 1630 1631 rtval = 0; 1632 if (pv) { 1633 1634 rtval = pmap_unuse_pt(pmap, va, pv->pv_ptem); 1635 TAILQ_REMOVE(&ppv->pv_list, pv, pv_list); 1636 ppv->pv_list_count--; 1637 if (TAILQ_FIRST(&ppv->pv_list) == NULL) 1638 vm_page_flag_clear(ppv->pv_vm_page, PG_MAPPED | PG_WRITEABLE); 1639 1640 TAILQ_REMOVE(&pmap->pm_pvlist, pv, pv_plist); 1641 free_pv_entry(pv); 1642 } 1643 1644 splx(s); 1645 return rtval; 1646} 1647 1648/* 1649 * Create a pv entry for page at pa for 1650 * (pmap, va). 1651 */ 1652static void 1653pmap_insert_entry(pmap, va, mpte, pa) 1654 pmap_t pmap; 1655 vm_offset_t va; 1656 vm_page_t mpte; 1657 vm_offset_t pa; 1658{ 1659 1660 int s; 1661 pv_entry_t pv; 1662 pv_table_t *ppv; 1663 1664 s = splvm(); 1665 pv = get_pv_entry(); 1666 pv->pv_va = va; 1667 pv->pv_pmap = pmap; 1668 pv->pv_ptem = mpte; 1669 1670 TAILQ_INSERT_TAIL(&pmap->pm_pvlist, pv, pv_plist); 1671 1672 ppv = pa_to_pvh(pa); 1673 TAILQ_INSERT_TAIL(&ppv->pv_list, pv, pv_list); 1674 ppv->pv_list_count++; 1675 1676 splx(s); 1677} 1678 1679/* 1680 * pmap_remove_pte: do the things to unmap a page in a process 1681 */ 1682static int 1683pmap_remove_pte(pmap, ptq, va) 1684 struct pmap *pmap; 1685 unsigned *ptq; 1686 vm_offset_t va; 1687{ 1688 unsigned oldpte; 1689 pv_table_t *ppv; 1690 1691 oldpte = loadandclear(ptq); 1692 if (oldpte & PG_W) 1693 pmap->pm_stats.wired_count -= 1; 1694 /* 1695 * Machines that don't support invlpg, also don't support 1696 * PG_G. 1697 */ 1698 if (oldpte & PG_G) 1699 invlpg(va); 1700 pmap->pm_stats.resident_count -= 1; 1701 if (oldpte & PG_MANAGED) { 1702 ppv = pa_to_pvh(oldpte); 1703 if (oldpte & PG_M) { 1704#if defined(PMAP_DIAGNOSTIC) 1705 if (pmap_nw_modified((pt_entry_t) oldpte)) { 1706 printf( 1707 "pmap_remove: modified page not writable: va: 0x%x, pte: 0x%x\n", 1708 va, oldpte); 1709 } 1710#endif 1711 if (pmap_track_modified(va)) 1712 vm_page_dirty(ppv->pv_vm_page); 1713 } 1714 if (oldpte & PG_A) 1715 vm_page_flag_set(ppv->pv_vm_page, PG_REFERENCED); 1716 return pmap_remove_entry(pmap, ppv, va); 1717 } else { 1718 return pmap_unuse_pt(pmap, va, NULL); 1719 } 1720 1721 return 0; 1722} 1723 1724/* 1725 * Remove a single page from a process address space 1726 */ 1727static void 1728pmap_remove_page(pmap, va) 1729 struct pmap *pmap; 1730 register vm_offset_t va; 1731{ 1732 register unsigned *ptq; 1733 1734 /* 1735 * if there is no pte for this address, just skip it!!! 1736 */ 1737 if (*pmap_pde(pmap, va) == 0) { 1738 return; 1739 } 1740 1741 /* 1742 * get a local va for mappings for this pmap. 1743 */ 1744 ptq = get_ptbase(pmap) + i386_btop(va); 1745 if (*ptq) { 1746 (void) pmap_remove_pte(pmap, ptq, va); 1747 pmap_TLB_invalidate(pmap, va); 1748 } 1749 return; 1750} 1751 1752/* 1753 * Remove the given range of addresses from the specified map. 1754 * 1755 * It is assumed that the start and end are properly 1756 * rounded to the page size. 1757 */ 1758void 1759pmap_remove(pmap, sva, eva) 1760 struct pmap *pmap; 1761 register vm_offset_t sva; 1762 register vm_offset_t eva; 1763{ 1764 register unsigned *ptbase; 1765 vm_offset_t pdnxt; 1766 vm_offset_t ptpaddr; 1767 vm_offset_t sindex, eindex; 1768 int anyvalid; 1769 1770 if (pmap == NULL) 1771 return; 1772 1773 if (pmap->pm_stats.resident_count == 0) 1774 return; 1775 1776 /* 1777 * special handling of removing one page. a very 1778 * common operation and easy to short circuit some 1779 * code. 1780 */ 1781 if (((sva + PAGE_SIZE) == eva) && 1782 (((unsigned) pmap->pm_pdir[(sva >> PDRSHIFT)] & PG_PS) == 0)) { 1783 pmap_remove_page(pmap, sva); 1784 return; 1785 } 1786 1787 anyvalid = 0; 1788 1789 /* 1790 * Get a local virtual address for the mappings that are being 1791 * worked with. 1792 */ 1793 ptbase = get_ptbase(pmap); 1794 1795 sindex = i386_btop(sva); 1796 eindex = i386_btop(eva); 1797 1798 for (; sindex < eindex; sindex = pdnxt) { 1799 unsigned pdirindex; 1800 1801 /* 1802 * Calculate index for next page table. 1803 */ 1804 pdnxt = ((sindex + NPTEPG) & ~(NPTEPG - 1)); 1805 if (pmap->pm_stats.resident_count == 0) 1806 break; 1807 1808 pdirindex = sindex / NPDEPG; 1809 if (((ptpaddr = (unsigned) pmap->pm_pdir[pdirindex]) & PG_PS) != 0) { 1810 pmap->pm_pdir[pdirindex] = 0; 1811 pmap->pm_stats.resident_count -= NBPDR / PAGE_SIZE; 1812 anyvalid++; 1813 continue; 1814 } 1815 1816 /* 1817 * Weed out invalid mappings. Note: we assume that the page 1818 * directory table is always allocated, and in kernel virtual. 1819 */ 1820 if (ptpaddr == 0) 1821 continue; 1822 1823 /* 1824 * Limit our scan to either the end of the va represented 1825 * by the current page table page, or to the end of the 1826 * range being removed. 1827 */ 1828 if (pdnxt > eindex) { 1829 pdnxt = eindex; 1830 } 1831 1832 for ( ;sindex != pdnxt; sindex++) { 1833 vm_offset_t va; 1834 if (ptbase[sindex] == 0) { 1835 continue; 1836 } 1837 va = i386_ptob(sindex); 1838 1839 anyvalid++; 1840 if (pmap_remove_pte(pmap, 1841 ptbase + sindex, va)) 1842 break; 1843 } 1844 } 1845 1846 if (anyvalid) 1847 pmap_TLB_invalidate_all(pmap); 1848} 1849 1850/* 1851 * Routine: pmap_remove_all 1852 * Function: 1853 * Removes this physical page from 1854 * all physical maps in which it resides. 1855 * Reflects back modify bits to the pager. 1856 * 1857 * Notes: 1858 * Original versions of this routine were very 1859 * inefficient because they iteratively called 1860 * pmap_remove (slow...) 1861 */ 1862 1863static void 1864pmap_remove_all(pa) 1865 vm_offset_t pa; 1866{ 1867 register pv_entry_t pv; 1868 pv_table_t *ppv; 1869 register unsigned *pte, tpte; 1870 int s; 1871 1872#if defined(PMAP_DIAGNOSTIC) 1873 /* 1874 * XXX this makes pmap_page_protect(NONE) illegal for non-managed 1875 * pages! 1876 */ 1877 if (!pmap_is_managed(pa)) { 1878 panic("pmap_page_protect: illegal for unmanaged page, va: 0x%x", pa); 1879 } 1880#endif 1881 1882 s = splvm(); 1883 ppv = pa_to_pvh(pa); 1884 while ((pv = TAILQ_FIRST(&ppv->pv_list)) != NULL) { 1885 pv->pv_pmap->pm_stats.resident_count--; 1886 1887 pte = pmap_pte_quick(pv->pv_pmap, pv->pv_va); 1888 1889 tpte = loadandclear(pte); 1890 if (tpte & PG_W) 1891 pv->pv_pmap->pm_stats.wired_count--; 1892 1893 if (tpte & PG_A) 1894 vm_page_flag_set(ppv->pv_vm_page, PG_REFERENCED); 1895 1896 /* 1897 * Update the vm_page_t clean and reference bits. 1898 */ 1899 if (tpte & PG_M) { 1900#if defined(PMAP_DIAGNOSTIC) 1901 if (pmap_nw_modified((pt_entry_t) tpte)) { 1902 printf( 1903 "pmap_remove_all: modified page not writable: va: 0x%x, pte: 0x%x\n", 1904 pv->pv_va, tpte); 1905 } 1906#endif 1907 if (pmap_track_modified(pv->pv_va)) 1908 vm_page_dirty(ppv->pv_vm_page); 1909 } 1910 pmap_TLB_invalidate(pv->pv_pmap, pv->pv_va); 1911 1912 TAILQ_REMOVE(&pv->pv_pmap->pm_pvlist, pv, pv_plist); 1913 TAILQ_REMOVE(&ppv->pv_list, pv, pv_list); 1914 ppv->pv_list_count--; 1915 pmap_unuse_pt(pv->pv_pmap, pv->pv_va, pv->pv_ptem); 1916 free_pv_entry(pv); 1917 } 1918 1919 vm_page_flag_clear(ppv->pv_vm_page, PG_MAPPED | PG_WRITEABLE); 1920 1921 splx(s); 1922} 1923 1924/* 1925 * Set the physical protection on the 1926 * specified range of this map as requested. 1927 */ 1928void 1929pmap_protect(pmap_t pmap, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot) 1930{ 1931 register unsigned *ptbase; 1932 vm_offset_t pdnxt, ptpaddr; 1933 vm_pindex_t sindex, eindex; 1934 int anychanged; 1935 1936 1937 if (pmap == NULL) 1938 return; 1939 1940 if ((prot & VM_PROT_READ) == VM_PROT_NONE) { 1941 pmap_remove(pmap, sva, eva); 1942 return; 1943 } 1944 1945 if (prot & VM_PROT_WRITE) 1946 return; 1947 1948 anychanged = 0; 1949 1950 ptbase = get_ptbase(pmap); 1951 1952 sindex = i386_btop(sva); 1953 eindex = i386_btop(eva); 1954 1955 for (; sindex < eindex; sindex = pdnxt) { 1956 1957 unsigned pdirindex; 1958 1959 pdnxt = ((sindex + NPTEPG) & ~(NPTEPG - 1)); 1960 1961 pdirindex = sindex / NPDEPG; 1962 if (((ptpaddr = (unsigned) pmap->pm_pdir[pdirindex]) & PG_PS) != 0) { 1963 (unsigned) pmap->pm_pdir[pdirindex] &= ~(PG_M|PG_RW); 1964 pmap->pm_stats.resident_count -= NBPDR / PAGE_SIZE; 1965 anychanged++; 1966 continue; 1967 } 1968 1969 /* 1970 * Weed out invalid mappings. Note: we assume that the page 1971 * directory table is always allocated, and in kernel virtual. 1972 */ 1973 if (ptpaddr == 0) 1974 continue; 1975 1976 if (pdnxt > eindex) { 1977 pdnxt = eindex; 1978 } 1979 1980 for (; sindex != pdnxt; sindex++) { 1981 1982 unsigned pbits; 1983 pv_table_t *ppv; 1984 1985 pbits = ptbase[sindex]; 1986 1987 if (pbits & PG_MANAGED) { 1988 ppv = NULL; 1989 if (pbits & PG_A) { 1990 ppv = pa_to_pvh(pbits); 1991 vm_page_flag_set(ppv->pv_vm_page, PG_REFERENCED); 1992 pbits &= ~PG_A; 1993 } 1994 if (pbits & PG_M) { 1995 if (pmap_track_modified(i386_ptob(sindex))) { 1996 if (ppv == NULL) 1997 ppv = pa_to_pvh(pbits); 1998 vm_page_dirty(ppv->pv_vm_page); 1999 pbits &= ~PG_M; 2000 } 2001 } 2002 } 2003 2004 pbits &= ~PG_RW; 2005 2006 if (pbits != ptbase[sindex]) { 2007 ptbase[sindex] = pbits; 2008 anychanged = 1; 2009 } 2010 } 2011 } 2012 if (anychanged) 2013 pmap_TLB_invalidate_all(pmap); 2014} 2015 2016/* 2017 * Insert the given physical page (p) at 2018 * the specified virtual address (v) in the 2019 * target physical map with the protection requested. 2020 * 2021 * If specified, the page will be wired down, meaning 2022 * that the related pte can not be reclaimed. 2023 * 2024 * NB: This is the only routine which MAY NOT lazy-evaluate 2025 * or lose information. That is, this routine must actually 2026 * insert this page into the given map NOW. 2027 */ 2028void 2029pmap_enter(pmap_t pmap, vm_offset_t va, vm_offset_t pa, vm_prot_t prot, 2030 boolean_t wired) 2031{ 2032 register unsigned *pte; 2033 vm_offset_t opa; 2034 vm_offset_t origpte, newpte; 2035 vm_page_t mpte; 2036 2037 if (pmap == NULL) 2038 return; 2039 2040 va &= PG_FRAME; 2041#ifdef PMAP_DIAGNOSTIC 2042 if (va > VM_MAX_KERNEL_ADDRESS) 2043 panic("pmap_enter: toobig"); 2044 if ((va >= UPT_MIN_ADDRESS) && (va < UPT_MAX_ADDRESS)) 2045 panic("pmap_enter: invalid to pmap_enter page table pages (va: 0x%x)", va); 2046#endif 2047 2048 mpte = NULL; 2049 /* 2050 * In the case that a page table page is not 2051 * resident, we are creating it here. 2052 */ 2053 if (va < UPT_MIN_ADDRESS) { 2054 mpte = pmap_allocpte(pmap, va); 2055 } 2056#if 0 && defined(PMAP_DIAGNOSTIC) 2057 else { 2058 vm_offset_t *pdeaddr = (vm_offset_t *)pmap_pde(pmap, va); 2059 if (((origpte = (vm_offset_t) *pdeaddr) & PG_V) == 0) { 2060 panic("pmap_enter: invalid kernel page table page(0), pdir=%p, pde=%p, va=%p\n", 2061 pmap->pm_pdir[PTDPTDI], origpte, va); 2062 } 2063 if (smp_active) { 2064 pdeaddr = (vm_offset_t *) IdlePTDS[cpuid]; 2065 if (((newpte = pdeaddr[va >> PDRSHIFT]) & PG_V) == 0) { 2066 if ((vm_offset_t) my_idlePTD != (vm_offset_t) vtophys(pdeaddr)) 2067 printf("pde mismatch: %x, %x\n", my_idlePTD, pdeaddr); 2068 printf("cpuid: %d, pdeaddr: 0x%x\n", cpuid, pdeaddr); 2069 panic("pmap_enter: invalid kernel page table page(1), pdir=%p, npde=%p, pde=%p, va=%p\n", 2070 pmap->pm_pdir[PTDPTDI], newpte, origpte, va); 2071 } 2072 } 2073 } 2074#endif 2075 2076 pte = pmap_pte(pmap, va); 2077 2078#if !defined(MAX_PERF) 2079 /* 2080 * Page Directory table entry not valid, we need a new PT page 2081 */ 2082 if (pte == NULL) { 2083 panic("pmap_enter: invalid page directory, pdir=%p, va=0x%x\n", 2084 (void *)pmap->pm_pdir[PTDPTDI], va); 2085 } 2086#endif 2087 2088 origpte = *(vm_offset_t *)pte; 2089 pa &= PG_FRAME; 2090 opa = origpte & PG_FRAME; 2091 2092#if !defined(MAX_PERF) 2093 if (origpte & PG_PS) 2094 panic("pmap_enter: attempted pmap_enter on 4MB page"); 2095#endif 2096 2097 /* 2098 * Mapping has not changed, must be protection or wiring change. 2099 */ 2100 if (origpte && (opa == pa)) { 2101 /* 2102 * Wiring change, just update stats. We don't worry about 2103 * wiring PT pages as they remain resident as long as there 2104 * are valid mappings in them. Hence, if a user page is wired, 2105 * the PT page will be also. 2106 */ 2107 if (wired && ((origpte & PG_W) == 0)) 2108 pmap->pm_stats.wired_count++; 2109 else if (!wired && (origpte & PG_W)) 2110 pmap->pm_stats.wired_count--; 2111 2112#if defined(PMAP_DIAGNOSTIC) 2113 if (pmap_nw_modified((pt_entry_t) origpte)) { 2114 printf( 2115 "pmap_enter: modified page not writable: va: 0x%x, pte: 0x%x\n", 2116 va, origpte); 2117 } 2118#endif 2119 2120 /* 2121 * Remove extra pte reference 2122 */ 2123 if (mpte) 2124 mpte->hold_count--; 2125 2126 if ((prot & VM_PROT_WRITE) && (origpte & PG_V)) { 2127 if ((origpte & PG_RW) == 0) { 2128 *pte |= PG_RW; 2129 invltlb_1pg(va); 2130 } 2131 return; 2132 } 2133 2134 /* 2135 * We might be turning off write access to the page, 2136 * so we go ahead and sense modify status. 2137 */ 2138 if (origpte & PG_MANAGED) { 2139 if ((origpte & PG_M) && pmap_track_modified(va)) { 2140 pv_table_t *ppv; 2141 ppv = pa_to_pvh(opa); 2142 vm_page_dirty(ppv->pv_vm_page); 2143 } 2144 pa |= PG_MANAGED; 2145 } 2146 goto validate; 2147 } 2148 /* 2149 * Mapping has changed, invalidate old range and fall through to 2150 * handle validating new mapping. 2151 */ 2152 if (opa) { 2153 int err; 2154 err = pmap_remove_pte(pmap, pte, va); 2155#if !defined(MAX_PERF) 2156 if (err) 2157 panic("pmap_enter: pte vanished, va: 0x%x", va); 2158#endif 2159 } 2160 2161 /* 2162 * Enter on the PV list if part of our managed memory Note that we 2163 * raise IPL while manipulating pv_table since pmap_enter can be 2164 * called at interrupt time. 2165 */ 2166 if (pmap_is_managed(pa)) { 2167 pmap_insert_entry(pmap, va, mpte, pa); 2168 pa |= PG_MANAGED; 2169 } 2170 2171 /* 2172 * Increment counters 2173 */ 2174 pmap->pm_stats.resident_count++; 2175 if (wired) 2176 pmap->pm_stats.wired_count++; 2177 2178validate: 2179 /* 2180 * Now validate mapping with desired protection/wiring. 2181 */ 2182 newpte = (vm_offset_t) (pa | pte_prot(pmap, prot) | PG_V); 2183 2184 if (wired) 2185 newpte |= PG_W; 2186 if (va < UPT_MIN_ADDRESS) 2187 newpte |= PG_U; 2188 if (pmap == kernel_pmap) 2189 newpte |= pgeflag; 2190 2191 /* 2192 * if the mapping or permission bits are different, we need 2193 * to update the pte. 2194 */ 2195 if ((origpte & ~(PG_M|PG_A)) != newpte) { 2196 *pte = newpte | PG_A; 2197 if (origpte) 2198 invltlb_1pg(va); 2199 } 2200} 2201 2202/* 2203 * this code makes some *MAJOR* assumptions: 2204 * 1. Current pmap & pmap exists. 2205 * 2. Not wired. 2206 * 3. Read access. 2207 * 4. No page table pages. 2208 * 5. Tlbflush is deferred to calling procedure. 2209 * 6. Page IS managed. 2210 * but is *MUCH* faster than pmap_enter... 2211 */ 2212 2213static vm_page_t 2214pmap_enter_quick(pmap, va, pa, mpte) 2215 register pmap_t pmap; 2216 vm_offset_t va; 2217 register vm_offset_t pa; 2218 vm_page_t mpte; 2219{ 2220 register unsigned *pte; 2221 2222 /* 2223 * In the case that a page table page is not 2224 * resident, we are creating it here. 2225 */ 2226 if (va < UPT_MIN_ADDRESS) { 2227 unsigned ptepindex; 2228 vm_offset_t ptepa; 2229 2230 /* 2231 * Calculate pagetable page index 2232 */ 2233 ptepindex = va >> PDRSHIFT; 2234 if (mpte && (mpte->pindex == ptepindex)) { 2235 mpte->hold_count++; 2236 } else { 2237retry: 2238 /* 2239 * Get the page directory entry 2240 */ 2241 ptepa = (vm_offset_t) pmap->pm_pdir[ptepindex]; 2242 2243 /* 2244 * If the page table page is mapped, we just increment 2245 * the hold count, and activate it. 2246 */ 2247 if (ptepa) { 2248#if !defined(MAX_PERF) 2249 if (ptepa & PG_PS) 2250 panic("pmap_enter_quick: unexpected mapping into 4MB page"); 2251#endif 2252 if (pmap->pm_ptphint && 2253 (pmap->pm_ptphint->pindex == ptepindex)) { 2254 mpte = pmap->pm_ptphint; 2255 } else { 2256 mpte = pmap_page_lookup( pmap->pm_pteobj, ptepindex); 2257 pmap->pm_ptphint = mpte; 2258 } 2259 if (mpte == NULL) 2260 goto retry; 2261 mpte->hold_count++; 2262 } else { 2263 mpte = _pmap_allocpte(pmap, ptepindex); 2264 } 2265 } 2266 } else { 2267 mpte = NULL; 2268 } 2269 2270 /* 2271 * This call to vtopte makes the assumption that we are 2272 * entering the page into the current pmap. In order to support 2273 * quick entry into any pmap, one would likely use pmap_pte_quick. 2274 * But that isn't as quick as vtopte. 2275 */ 2276 pte = (unsigned *)vtopte(va); 2277 if (*pte) { 2278 if (mpte) 2279 pmap_unwire_pte_hold(pmap, mpte); 2280 return 0; 2281 } 2282 2283 /* 2284 * Enter on the PV list if part of our managed memory Note that we 2285 * raise IPL while manipulating pv_table since pmap_enter can be 2286 * called at interrupt time. 2287 */ 2288 pmap_insert_entry(pmap, va, mpte, pa); 2289 2290 /* 2291 * Increment counters 2292 */ 2293 pmap->pm_stats.resident_count++; 2294 2295 /* 2296 * Now validate mapping with RO protection 2297 */ 2298 *pte = pa | PG_V | PG_U | PG_MANAGED; 2299 2300 return mpte; 2301} 2302 2303#define MAX_INIT_PT (96) 2304/* 2305 * pmap_object_init_pt preloads the ptes for a given object 2306 * into the specified pmap. This eliminates the blast of soft 2307 * faults on process startup and immediately after an mmap. 2308 */ 2309void 2310pmap_object_init_pt(pmap, addr, object, pindex, size, limit) 2311 pmap_t pmap; 2312 vm_offset_t addr; 2313 vm_object_t object; 2314 vm_pindex_t pindex; 2315 vm_size_t size; 2316 int limit; 2317{ 2318 vm_offset_t tmpidx; 2319 int psize; 2320 vm_page_t p, mpte; 2321 int objpgs; 2322 2323 if (!pmap) 2324 return; 2325 2326 /* 2327 * This code maps large physical mmap regions into the 2328 * processor address space. Note that some shortcuts 2329 * are taken, but the code works. 2330 */ 2331 if (pseflag && 2332 (object->type == OBJT_DEVICE) && 2333 ((addr & (NBPDR - 1)) == 0) && 2334 ((size & (NBPDR - 1)) == 0) ) { 2335 int i; 2336 vm_page_t m[1]; 2337 unsigned int ptepindex; 2338 int npdes; 2339 vm_offset_t ptepa; 2340 2341 if (pmap->pm_pdir[ptepindex = (addr >> PDRSHIFT)]) 2342 return; 2343 2344retry: 2345 p = vm_page_lookup(object, pindex); 2346 if (p && vm_page_sleep_busy(p, FALSE, "init4p")) 2347 goto retry; 2348 2349 if (p == NULL) { 2350 p = vm_page_alloc(object, pindex, VM_ALLOC_NORMAL); 2351 if (p == NULL) 2352 return; 2353 m[0] = p; 2354 2355 if (vm_pager_get_pages(object, m, 1, 0) != VM_PAGER_OK) { 2356 vm_page_free(p); 2357 return; 2358 } 2359 2360 p = vm_page_lookup(object, pindex); 2361 vm_page_wakeup(p); 2362 } 2363 2364 ptepa = (vm_offset_t) VM_PAGE_TO_PHYS(p); 2365 if (ptepa & (NBPDR - 1)) { 2366 return; 2367 } 2368 2369 p->valid = VM_PAGE_BITS_ALL; 2370 2371 pmap->pm_stats.resident_count += size >> PAGE_SHIFT; 2372 npdes = size >> PDRSHIFT; 2373 for(i=0;i<npdes;i++) { 2374 pmap->pm_pdir[ptepindex] = 2375 (pd_entry_t) (ptepa | PG_U | PG_RW | PG_V | PG_PS); 2376 ptepa += NBPDR; 2377 ptepindex += 1; 2378 } 2379 vm_page_flag_set(p, PG_MAPPED); 2380 invltlb(); 2381 return; 2382 } 2383 2384 psize = i386_btop(size); 2385 2386 if ((object->type != OBJT_VNODE) || 2387 (limit && (psize > MAX_INIT_PT) && 2388 (object->resident_page_count > MAX_INIT_PT))) { 2389 return; 2390 } 2391 2392 if (psize + pindex > object->size) 2393 psize = object->size - pindex; 2394 2395 mpte = NULL; 2396 /* 2397 * if we are processing a major portion of the object, then scan the 2398 * entire thing. 2399 */ 2400 if (psize > (object->size >> 2)) { 2401 objpgs = psize; 2402 2403 for (p = TAILQ_FIRST(&object->memq); 2404 ((objpgs > 0) && (p != NULL)); 2405 p = TAILQ_NEXT(p, listq)) { 2406 2407 tmpidx = p->pindex; 2408 if (tmpidx < pindex) { 2409 continue; 2410 } 2411 tmpidx -= pindex; 2412 if (tmpidx >= psize) { 2413 continue; 2414 } 2415 if (((p->valid & VM_PAGE_BITS_ALL) == VM_PAGE_BITS_ALL) && 2416 (p->busy == 0) && 2417 (p->flags & (PG_BUSY | PG_FICTITIOUS)) == 0) { 2418 if ((p->queue - p->pc) == PQ_CACHE) 2419 vm_page_deactivate(p); 2420 vm_page_busy(p); 2421 mpte = pmap_enter_quick(pmap, 2422 addr + i386_ptob(tmpidx), 2423 VM_PAGE_TO_PHYS(p), mpte); 2424 vm_page_flag_set(p, PG_MAPPED); 2425 vm_page_wakeup(p); 2426 } 2427 objpgs -= 1; 2428 } 2429 } else { 2430 /* 2431 * else lookup the pages one-by-one. 2432 */ 2433 for (tmpidx = 0; tmpidx < psize; tmpidx += 1) { 2434 p = vm_page_lookup(object, tmpidx + pindex); 2435 if (p && 2436 ((p->valid & VM_PAGE_BITS_ALL) == VM_PAGE_BITS_ALL) && 2437 (p->busy == 0) && 2438 (p->flags & (PG_BUSY | PG_FICTITIOUS)) == 0) { 2439 if ((p->queue - p->pc) == PQ_CACHE) 2440 vm_page_deactivate(p); 2441 vm_page_busy(p); 2442 mpte = pmap_enter_quick(pmap, 2443 addr + i386_ptob(tmpidx), 2444 VM_PAGE_TO_PHYS(p), mpte); 2445 vm_page_flag_set(p, PG_MAPPED); 2446 vm_page_wakeup(p); 2447 } 2448 } 2449 } 2450 return; 2451} 2452 2453/* 2454 * pmap_prefault provides a quick way of clustering 2455 * pagefaults into a processes address space. It is a "cousin" 2456 * of pmap_object_init_pt, except it runs at page fault time instead 2457 * of mmap time. 2458 */ 2459#define PFBAK 4 2460#define PFFOR 4 2461#define PAGEORDER_SIZE (PFBAK+PFFOR) 2462 2463static int pmap_prefault_pageorder[] = { 2464 -PAGE_SIZE, PAGE_SIZE, 2465 -2 * PAGE_SIZE, 2 * PAGE_SIZE, 2466 -3 * PAGE_SIZE, 3 * PAGE_SIZE 2467 -4 * PAGE_SIZE, 4 * PAGE_SIZE 2468}; 2469 2470void 2471pmap_prefault(pmap, addra, entry) 2472 pmap_t pmap; 2473 vm_offset_t addra; 2474 vm_map_entry_t entry; 2475{ 2476 int i; 2477 vm_offset_t starta; 2478 vm_offset_t addr; 2479 vm_pindex_t pindex; 2480 vm_page_t m, mpte; 2481 vm_object_t object; 2482 2483 if (!curproc || (pmap != vmspace_pmap(curproc->p_vmspace))) 2484 return; 2485 2486 object = entry->object.vm_object; 2487 2488 starta = addra - PFBAK * PAGE_SIZE; 2489 if (starta < entry->start) { 2490 starta = entry->start; 2491 } else if (starta > addra) { 2492 starta = 0; 2493 } 2494 2495 mpte = NULL; 2496 for (i = 0; i < PAGEORDER_SIZE; i++) { 2497 vm_object_t lobject; 2498 unsigned *pte; 2499 2500 addr = addra + pmap_prefault_pageorder[i]; 2501 if (addr > addra + (PFFOR * PAGE_SIZE)) 2502 addr = 0; 2503 2504 if (addr < starta || addr >= entry->end) 2505 continue; 2506 2507 if ((*pmap_pde(pmap, addr)) == NULL) 2508 continue; 2509 2510 pte = (unsigned *) vtopte(addr); 2511 if (*pte) 2512 continue; 2513 2514 pindex = ((addr - entry->start) + entry->offset) >> PAGE_SHIFT; 2515 lobject = object; 2516 for (m = vm_page_lookup(lobject, pindex); 2517 (!m && (lobject->type == OBJT_DEFAULT) && (lobject->backing_object)); 2518 lobject = lobject->backing_object) { 2519 if (lobject->backing_object_offset & PAGE_MASK) 2520 break; 2521 pindex += (lobject->backing_object_offset >> PAGE_SHIFT); 2522 m = vm_page_lookup(lobject->backing_object, pindex); 2523 } 2524 2525 /* 2526 * give-up when a page is not in memory 2527 */ 2528 if (m == NULL) 2529 break; 2530 2531 if (((m->valid & VM_PAGE_BITS_ALL) == VM_PAGE_BITS_ALL) && 2532 (m->busy == 0) && 2533 (m->flags & (PG_BUSY | PG_FICTITIOUS)) == 0) { 2534 2535 if ((m->queue - m->pc) == PQ_CACHE) { 2536 vm_page_deactivate(m); 2537 } 2538 vm_page_busy(m); 2539 mpte = pmap_enter_quick(pmap, addr, 2540 VM_PAGE_TO_PHYS(m), mpte); 2541 vm_page_flag_set(m, PG_MAPPED); 2542 vm_page_wakeup(m); 2543 } 2544 } 2545} 2546 2547/* 2548 * Routine: pmap_change_wiring 2549 * Function: Change the wiring attribute for a map/virtual-address 2550 * pair. 2551 * In/out conditions: 2552 * The mapping must already exist in the pmap. 2553 */ 2554void 2555pmap_change_wiring(pmap, va, wired) 2556 register pmap_t pmap; 2557 vm_offset_t va; 2558 boolean_t wired; 2559{ 2560 register unsigned *pte; 2561 2562 if (pmap == NULL) 2563 return; 2564 2565 pte = pmap_pte(pmap, va); 2566 2567 if (wired && !pmap_pte_w(pte)) 2568 pmap->pm_stats.wired_count++; 2569 else if (!wired && pmap_pte_w(pte)) 2570 pmap->pm_stats.wired_count--; 2571 2572 /* 2573 * Wiring is not a hardware characteristic so there is no need to 2574 * invalidate TLB. 2575 */ 2576 pmap_pte_set_w(pte, wired); 2577} 2578 2579 2580 2581/* 2582 * Copy the range specified by src_addr/len 2583 * from the source map to the range dst_addr/len 2584 * in the destination map. 2585 * 2586 * This routine is only advisory and need not do anything. 2587 */ 2588 2589void 2590pmap_copy(dst_pmap, src_pmap, dst_addr, len, src_addr) 2591 pmap_t dst_pmap, src_pmap; 2592 vm_offset_t dst_addr; 2593 vm_size_t len; 2594 vm_offset_t src_addr; 2595{ 2596 vm_offset_t addr; 2597 vm_offset_t end_addr = src_addr + len; 2598 vm_offset_t pdnxt; 2599 unsigned src_frame, dst_frame; 2600 2601 if (dst_addr != src_addr) 2602 return; 2603 2604 src_frame = ((unsigned) src_pmap->pm_pdir[PTDPTDI]) & PG_FRAME; 2605 if (src_frame != (((unsigned) PTDpde) & PG_FRAME)) { 2606 return; 2607 } 2608 2609 dst_frame = ((unsigned) dst_pmap->pm_pdir[PTDPTDI]) & PG_FRAME; 2610 if (dst_frame != (((unsigned) APTDpde) & PG_FRAME)) { 2611 APTDpde = (pd_entry_t) (dst_frame | PG_RW | PG_V); 2612#if defined(SMP) 2613 /* The page directory is not shared between CPUs */ 2614 cpu_invltlb(); 2615#else 2616 invltlb(); 2617#endif 2618 } 2619 2620 for(addr = src_addr; addr < end_addr; addr = pdnxt) { 2621 unsigned *src_pte, *dst_pte; 2622 vm_page_t dstmpte, srcmpte; 2623 vm_offset_t srcptepaddr; 2624 unsigned ptepindex; 2625 2626#if !defined(MAX_PERF) 2627 if (addr >= UPT_MIN_ADDRESS) 2628 panic("pmap_copy: invalid to pmap_copy page tables\n"); 2629#endif 2630 2631 /* 2632 * Don't let optional prefaulting of pages make us go 2633 * way below the low water mark of free pages or way 2634 * above high water mark of used pv entries. 2635 */ 2636 if (cnt.v_free_count < cnt.v_free_reserved || 2637 pv_entry_count > pv_entry_high_water) 2638 break; 2639 2640 pdnxt = ((addr + PAGE_SIZE*NPTEPG) & ~(PAGE_SIZE*NPTEPG - 1)); 2641 ptepindex = addr >> PDRSHIFT; 2642 2643 srcptepaddr = (vm_offset_t) src_pmap->pm_pdir[ptepindex]; 2644 if (srcptepaddr == 0) 2645 continue; 2646 2647 if (srcptepaddr & PG_PS) { 2648 if (dst_pmap->pm_pdir[ptepindex] == 0) { 2649 dst_pmap->pm_pdir[ptepindex] = (pd_entry_t) srcptepaddr; 2650 dst_pmap->pm_stats.resident_count += NBPDR; 2651 } 2652 continue; 2653 } 2654 2655 srcmpte = vm_page_lookup(src_pmap->pm_pteobj, ptepindex); 2656 if ((srcmpte == NULL) || 2657 (srcmpte->hold_count == 0) || (srcmpte->flags & PG_BUSY)) 2658 continue; 2659 2660 if (pdnxt > end_addr) 2661 pdnxt = end_addr; 2662 2663 src_pte = (unsigned *) vtopte(addr); 2664 dst_pte = (unsigned *) avtopte(addr); 2665 while (addr < pdnxt) { 2666 unsigned ptetemp; 2667 ptetemp = *src_pte; 2668 /* 2669 * we only virtual copy managed pages 2670 */ 2671 if ((ptetemp & PG_MANAGED) != 0) { 2672 /* 2673 * We have to check after allocpte for the 2674 * pte still being around... allocpte can 2675 * block. 2676 */ 2677 dstmpte = pmap_allocpte(dst_pmap, addr); 2678 if ((*dst_pte == 0) && (ptetemp = *src_pte)) { 2679 /* 2680 * Clear the modified and 2681 * accessed (referenced) bits 2682 * during the copy. 2683 */ 2684 *dst_pte = ptetemp & ~(PG_M | PG_A); 2685 dst_pmap->pm_stats.resident_count++; 2686 pmap_insert_entry(dst_pmap, addr, 2687 dstmpte, 2688 (ptetemp & PG_FRAME)); 2689 } else { 2690 pmap_unwire_pte_hold(dst_pmap, dstmpte); 2691 } 2692 if (dstmpte->hold_count >= srcmpte->hold_count) 2693 break; 2694 } 2695 addr += PAGE_SIZE; 2696 src_pte++; 2697 dst_pte++; 2698 } 2699 } 2700} 2701 2702/* 2703 * Routine: pmap_kernel 2704 * Function: 2705 * Returns the physical map handle for the kernel. 2706 */ 2707pmap_t 2708pmap_kernel() 2709{ 2710 return (kernel_pmap); 2711} 2712 2713/* 2714 * pmap_zero_page zeros the specified hardware page by mapping 2715 * the page into KVM and using bzero to clear its contents. 2716 */ 2717void 2718pmap_zero_page(phys) 2719 vm_offset_t phys; 2720{ 2721#ifdef SMP 2722#if !defined(MAX_PERF) 2723 if (*(int *) prv_CMAP3) 2724 panic("pmap_zero_page: prv_CMAP3 busy"); 2725#endif 2726 2727 *(int *) prv_CMAP3 = PG_V | PG_RW | (phys & PG_FRAME) | PG_A | PG_M; 2728 cpu_invlpg(&prv_CPAGE3); 2729 2730#if defined(I686_CPU) 2731 if (cpu_class == CPUCLASS_686) 2732 i686_pagezero(&prv_CPAGE3); 2733 else 2734#endif 2735 bzero(&prv_CPAGE3, PAGE_SIZE); 2736 2737 *(int *) prv_CMAP3 = 0; 2738#else 2739#if !defined(MAX_PERF) 2740 if (*(int *) CMAP2) 2741 panic("pmap_zero_page: CMAP2 busy"); 2742#endif 2743 2744 *(int *) CMAP2 = PG_V | PG_RW | (phys & PG_FRAME) | PG_A | PG_M; 2745 if (cpu_class == CPUCLASS_386) { 2746 invltlb(); 2747 } else { 2748 invlpg((u_int)CADDR2); 2749 } 2750 2751#if defined(I686_CPU) 2752 if (cpu_class == CPUCLASS_686) 2753 i686_pagezero(CADDR2); 2754 else 2755#endif 2756 bzero(CADDR2, PAGE_SIZE); 2757 *(int *) CMAP2 = 0; 2758#endif 2759} 2760 2761/* 2762 * pmap_zero_page_area zeros the specified hardware page by mapping 2763 * the page into KVM and using bzero to clear its contents. 2764 * 2765 * off and size may not cover an area beyond a single hardware page. 2766 */ 2767void 2768pmap_zero_page_area(phys, off, size) 2769 vm_offset_t phys; 2770 int off; 2771 int size; 2772{ 2773#ifdef SMP 2774#if !defined(MAX_PERF) 2775 if (*(int *) prv_CMAP3) 2776 panic("pmap_zero_page: prv_CMAP3 busy"); 2777#endif 2778 2779 *(int *) prv_CMAP3 = PG_V | PG_RW | (phys & PG_FRAME) | PG_A | PG_M; 2780 cpu_invlpg(&prv_CPAGE3); 2781 2782#if defined(I686_CPU) 2783 if (cpu_class == CPUCLASS_686 && off == 0 && size == PAGE_SIZE) 2784 i686_pagezero(&prv_CPAGE3); 2785 else 2786#endif 2787 bzero((char *)&prv_CPAGE3 + off, size); 2788 2789 *(int *) prv_CMAP3 = 0; 2790#else 2791#if !defined(MAX_PERF) 2792 if (*(int *) CMAP2) 2793 panic("pmap_zero_page: CMAP2 busy"); 2794#endif 2795 2796 *(int *) CMAP2 = PG_V | PG_RW | (phys & PG_FRAME) | PG_A | PG_M; 2797 if (cpu_class == CPUCLASS_386) { 2798 invltlb(); 2799 } else { 2800 invlpg((u_int)CADDR2); 2801 } 2802 2803#if defined(I686_CPU) 2804 if (cpu_class == CPUCLASS_686 && off == 0 && size == PAGE_SIZE) 2805 i686_pagezero(CADDR2); 2806 else 2807#endif 2808 bzero((char *)CADDR2 + off, size); 2809 *(int *) CMAP2 = 0; 2810#endif 2811} 2812 2813/* 2814 * pmap_copy_page copies the specified (machine independent) 2815 * page by mapping the page into virtual memory and using 2816 * bcopy to copy the page, one machine dependent page at a 2817 * time. 2818 */ 2819void 2820pmap_copy_page(src, dst) 2821 vm_offset_t src; 2822 vm_offset_t dst; 2823{ 2824#ifdef SMP 2825#if !defined(MAX_PERF) 2826 if (*(int *) prv_CMAP1) 2827 panic("pmap_copy_page: prv_CMAP1 busy"); 2828 if (*(int *) prv_CMAP2) 2829 panic("pmap_copy_page: prv_CMAP2 busy"); 2830#endif 2831 2832 *(int *) prv_CMAP1 = PG_V | (src & PG_FRAME) | PG_A; 2833 *(int *) prv_CMAP2 = PG_V | PG_RW | (dst & PG_FRAME) | PG_A | PG_M; 2834 2835 cpu_invlpg(&prv_CPAGE1); 2836 cpu_invlpg(&prv_CPAGE2); 2837 2838 bcopy(&prv_CPAGE1, &prv_CPAGE2, PAGE_SIZE); 2839 2840 *(int *) prv_CMAP1 = 0; 2841 *(int *) prv_CMAP2 = 0; 2842#else 2843#if !defined(MAX_PERF) 2844 if (*(int *) CMAP1 || *(int *) CMAP2) 2845 panic("pmap_copy_page: CMAP busy"); 2846#endif 2847 2848 *(int *) CMAP1 = PG_V | (src & PG_FRAME) | PG_A; 2849 *(int *) CMAP2 = PG_V | PG_RW | (dst & PG_FRAME) | PG_A | PG_M; 2850 if (cpu_class == CPUCLASS_386) { 2851 invltlb(); 2852 } else { 2853 invlpg((u_int)CADDR1); 2854 invlpg((u_int)CADDR2); 2855 } 2856 2857 bcopy(CADDR1, CADDR2, PAGE_SIZE); 2858 2859 *(int *) CMAP1 = 0; 2860 *(int *) CMAP2 = 0; 2861#endif 2862} 2863 2864 2865/* 2866 * Routine: pmap_pageable 2867 * Function: 2868 * Make the specified pages (by pmap, offset) 2869 * pageable (or not) as requested. 2870 * 2871 * A page which is not pageable may not take 2872 * a fault; therefore, its page table entry 2873 * must remain valid for the duration. 2874 * 2875 * This routine is merely advisory; pmap_enter 2876 * will specify that these pages are to be wired 2877 * down (or not) as appropriate. 2878 */ 2879void 2880pmap_pageable(pmap, sva, eva, pageable) 2881 pmap_t pmap; 2882 vm_offset_t sva, eva; 2883 boolean_t pageable; 2884{ 2885} 2886 2887/* 2888 * this routine returns true if a physical page resides 2889 * in the given pmap. 2890 */ 2891boolean_t 2892pmap_page_exists(pmap, pa) 2893 pmap_t pmap; 2894 vm_offset_t pa; 2895{ 2896 register pv_entry_t pv; 2897 pv_table_t *ppv; 2898 int s; 2899 2900 if (!pmap_is_managed(pa)) 2901 return FALSE; 2902 2903 s = splvm(); 2904 2905 ppv = pa_to_pvh(pa); 2906 /* 2907 * Not found, check current mappings returning immediately if found. 2908 */ 2909 for (pv = TAILQ_FIRST(&ppv->pv_list); 2910 pv; 2911 pv = TAILQ_NEXT(pv, pv_list)) { 2912 if (pv->pv_pmap == pmap) { 2913 splx(s); 2914 return TRUE; 2915 } 2916 } 2917 splx(s); 2918 return (FALSE); 2919} 2920 2921#define PMAP_REMOVE_PAGES_CURPROC_ONLY 2922/* 2923 * Remove all pages from specified address space 2924 * this aids process exit speeds. Also, this code 2925 * is special cased for current process only, but 2926 * can have the more generic (and slightly slower) 2927 * mode enabled. This is much faster than pmap_remove 2928 * in the case of running down an entire address space. 2929 */ 2930void 2931pmap_remove_pages(pmap, sva, eva) 2932 pmap_t pmap; 2933 vm_offset_t sva, eva; 2934{ 2935 unsigned *pte, tpte; 2936 pv_table_t *ppv; 2937 pv_entry_t pv, npv; 2938 int s; 2939 2940#ifdef PMAP_REMOVE_PAGES_CURPROC_ONLY 2941 if (!curproc || (pmap != vmspace_pmap(curproc->p_vmspace))) { 2942 printf("warning: pmap_remove_pages called with non-current pmap\n"); 2943 return; 2944 } 2945#endif 2946 2947 s = splvm(); 2948 for(pv = TAILQ_FIRST(&pmap->pm_pvlist); 2949 pv; 2950 pv = npv) { 2951 2952 if (pv->pv_va >= eva || pv->pv_va < sva) { 2953 npv = TAILQ_NEXT(pv, pv_plist); 2954 continue; 2955 } 2956 2957#ifdef PMAP_REMOVE_PAGES_CURPROC_ONLY 2958 pte = (unsigned *)vtopte(pv->pv_va); 2959#else 2960 pte = pmap_pte_quick(pv->pv_pmap, pv->pv_va); 2961#endif 2962 tpte = *pte; 2963 2964/* 2965 * We cannot remove wired pages from a process' mapping at this time 2966 */ 2967 if (tpte & PG_W) { 2968 npv = TAILQ_NEXT(pv, pv_plist); 2969 continue; 2970 } 2971 *pte = 0; 2972 2973 ppv = pa_to_pvh(tpte); 2974 2975 pv->pv_pmap->pm_stats.resident_count--; 2976 2977 /* 2978 * Update the vm_page_t clean and reference bits. 2979 */ 2980 if (tpte & PG_M) { 2981 vm_page_dirty(ppv->pv_vm_page); 2982 } 2983 2984 2985 npv = TAILQ_NEXT(pv, pv_plist); 2986 TAILQ_REMOVE(&pv->pv_pmap->pm_pvlist, pv, pv_plist); 2987 2988 ppv->pv_list_count--; 2989 TAILQ_REMOVE(&ppv->pv_list, pv, pv_list); 2990 if (TAILQ_FIRST(&ppv->pv_list) == NULL) { 2991 vm_page_flag_clear(ppv->pv_vm_page, PG_MAPPED | PG_WRITEABLE); 2992 } 2993 2994 pmap_unuse_pt(pv->pv_pmap, pv->pv_va, pv->pv_ptem); 2995 free_pv_entry(pv); 2996 } 2997 splx(s); 2998 pmap_TLB_invalidate_all(pmap); 2999} 3000 3001/* 3002 * pmap_testbit tests bits in pte's 3003 * note that the testbit/changebit routines are inline, 3004 * and a lot of things compile-time evaluate. 3005 */ 3006static boolean_t 3007pmap_testbit(pa, bit) 3008 register vm_offset_t pa; 3009 int bit; 3010{ 3011 register pv_entry_t pv; 3012 pv_table_t *ppv; 3013 unsigned *pte; 3014 int s; 3015 3016 if (!pmap_is_managed(pa)) 3017 return FALSE; 3018 3019 ppv = pa_to_pvh(pa); 3020 if (TAILQ_FIRST(&ppv->pv_list) == NULL) 3021 return FALSE; 3022 3023 s = splvm(); 3024 3025 for (pv = TAILQ_FIRST(&ppv->pv_list); 3026 pv; 3027 pv = TAILQ_NEXT(pv, pv_list)) { 3028 3029 /* 3030 * if the bit being tested is the modified bit, then 3031 * mark clean_map and ptes as never 3032 * modified. 3033 */ 3034 if (bit & (PG_A|PG_M)) { 3035 if (!pmap_track_modified(pv->pv_va)) 3036 continue; 3037 } 3038 3039#if defined(PMAP_DIAGNOSTIC) 3040 if (!pv->pv_pmap) { 3041 printf("Null pmap (tb) at va: 0x%x\n", pv->pv_va); 3042 continue; 3043 } 3044#endif 3045 pte = pmap_pte_quick(pv->pv_pmap, pv->pv_va); 3046 if (*pte & bit) { 3047 splx(s); 3048 return TRUE; 3049 } 3050 } 3051 splx(s); 3052 return (FALSE); 3053} 3054 3055/* 3056 * this routine is used to modify bits in ptes 3057 */ 3058static __inline void 3059pmap_changebit(pa, bit, setem) 3060 vm_offset_t pa; 3061 int bit; 3062 boolean_t setem; 3063{ 3064 register pv_entry_t pv; 3065 pv_table_t *ppv; 3066 register unsigned *pte; 3067 int s; 3068 3069 if (!pmap_is_managed(pa)) 3070 return; 3071 3072 s = splvm(); 3073 ppv = pa_to_pvh(pa); 3074 3075 /* 3076 * Loop over all current mappings setting/clearing as appropos If 3077 * setting RO do we need to clear the VAC? 3078 */ 3079 for (pv = TAILQ_FIRST(&ppv->pv_list); 3080 pv; 3081 pv = TAILQ_NEXT(pv, pv_list)) { 3082 3083 /* 3084 * don't write protect pager mappings 3085 */ 3086 if (!setem && (bit == PG_RW)) { 3087 if (!pmap_track_modified(pv->pv_va)) 3088 continue; 3089 } 3090 3091#if defined(PMAP_DIAGNOSTIC) 3092 if (!pv->pv_pmap) { 3093 printf("Null pmap (cb) at va: 0x%x\n", pv->pv_va); 3094 continue; 3095 } 3096#endif 3097 3098 pte = pmap_pte_quick(pv->pv_pmap, pv->pv_va); 3099 3100 if (setem) { 3101 *(int *)pte |= bit; 3102 pmap_TLB_invalidate(pv->pv_pmap, pv->pv_va); 3103 } else { 3104 vm_offset_t pbits = *(vm_offset_t *)pte; 3105 if (pbits & bit) { 3106 if (bit == PG_RW) { 3107 if (pbits & PG_M) { 3108 vm_page_dirty(ppv->pv_vm_page); 3109 } 3110 *(int *)pte = pbits & ~(PG_M|PG_RW); 3111 } else { 3112 *(int *)pte = pbits & ~bit; 3113 } 3114 pmap_TLB_invalidate(pv->pv_pmap, pv->pv_va); 3115 } 3116 } 3117 } 3118 splx(s); 3119} 3120 3121/* 3122 * pmap_clearbit: 3123 * 3124 * Clear a bit/bits in every pte mapping a given physical page. 3125 */ 3126static void 3127pmap_clearbit( 3128 vm_offset_t pa, 3129 int bit) 3130{ 3131 pmap_changebit(pa, bit, FALSE); 3132} 3133 3134/* 3135 * pmap_page_protect: 3136 * 3137 * Lower the permission for all mappings to a given page. 3138 */ 3139void 3140pmap_page_protect(vm_offset_t phys, vm_prot_t prot) 3141{ 3142 if ((prot & VM_PROT_WRITE) == 0) { 3143 if (prot & (VM_PROT_READ | VM_PROT_EXECUTE)) { 3144 pmap_clearbit(phys, PG_RW); 3145 } else { 3146 pmap_remove_all(phys); 3147 } 3148 } 3149} 3150 3151vm_offset_t 3152pmap_phys_address(ppn) 3153 int ppn; 3154{ 3155 return (i386_ptob(ppn)); 3156} 3157 3158/* 3159 * pmap_ts_referenced: 3160 * 3161 * Return the count of reference bits for a page, clearing all of them. 3162 */ 3163int 3164pmap_ts_referenced(vm_offset_t pa) 3165{ 3166 register pv_entry_t pv, pvf, pvn; 3167 pv_table_t *ppv; 3168 unsigned *pte; 3169 int s; 3170 int rtval = 0; 3171 3172 if (!pmap_is_managed(pa)) 3173 return (rtval); 3174 3175 s = splvm(); 3176 3177 ppv = pa_to_pvh(pa); 3178 3179 if ((pv = TAILQ_FIRST(&ppv->pv_list)) != NULL) { 3180 3181 pvf = pv; 3182 3183 do { 3184 pvn = TAILQ_NEXT(pv, pv_list); 3185 3186 TAILQ_REMOVE(&ppv->pv_list, pv, pv_list); 3187 3188 TAILQ_INSERT_TAIL(&ppv->pv_list, pv, pv_list); 3189 3190 if (!pmap_track_modified(pv->pv_va)) 3191 continue; 3192 3193 pte = pmap_pte_quick(pv->pv_pmap, pv->pv_va); 3194 3195 if (pte && *pte & PG_A) { 3196 *pte &= ~PG_A; 3197 3198 pmap_TLB_invalidate(pv->pv_pmap, pv->pv_va); 3199 3200 rtval++; 3201 if (rtval > 4) { 3202 break; 3203 } 3204 } 3205 } while ((pv = pvn) != NULL && pv != pvf); 3206 } 3207 splx(s); 3208 3209 return (rtval); 3210} 3211 3212/* 3213 * pmap_is_modified: 3214 * 3215 * Return whether or not the specified physical page was modified 3216 * in any physical maps. 3217 */ 3218boolean_t 3219pmap_is_modified(vm_offset_t pa) 3220{ 3221 return pmap_testbit((pa), PG_M); 3222} 3223 3224/* 3225 * Clear the modify bits on the specified physical page. 3226 */ 3227void 3228pmap_clear_modify(vm_offset_t pa) 3229{ 3230 pmap_clearbit(pa, PG_M); 3231} 3232 3233/* 3234 * pmap_clear_reference: 3235 * 3236 * Clear the reference bit on the specified physical page. 3237 */ 3238void 3239pmap_clear_reference(vm_offset_t pa) 3240{ 3241 pmap_clearbit(pa, PG_A); 3242} 3243 3244/* 3245 * Miscellaneous support routines follow 3246 */ 3247 3248static void 3249i386_protection_init() 3250{ 3251 register int *kp, prot; 3252 3253 kp = protection_codes; 3254 for (prot = 0; prot < 8; prot++) { 3255 switch (prot) { 3256 case VM_PROT_NONE | VM_PROT_NONE | VM_PROT_NONE: 3257 /* 3258 * Read access is also 0. There isn't any execute bit, 3259 * so just make it readable. 3260 */ 3261 case VM_PROT_READ | VM_PROT_NONE | VM_PROT_NONE: 3262 case VM_PROT_READ | VM_PROT_NONE | VM_PROT_EXECUTE: 3263 case VM_PROT_NONE | VM_PROT_NONE | VM_PROT_EXECUTE: 3264 *kp++ = 0; 3265 break; 3266 case VM_PROT_NONE | VM_PROT_WRITE | VM_PROT_NONE: 3267 case VM_PROT_NONE | VM_PROT_WRITE | VM_PROT_EXECUTE: 3268 case VM_PROT_READ | VM_PROT_WRITE | VM_PROT_NONE: 3269 case VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE: 3270 *kp++ = PG_RW; 3271 break; 3272 } 3273 } 3274} 3275 3276/* 3277 * Map a set of physical memory pages into the kernel virtual 3278 * address space. Return a pointer to where it is mapped. This 3279 * routine is intended to be used for mapping device memory, 3280 * NOT real memory. 3281 */ 3282void * 3283pmap_mapdev(pa, size) 3284 vm_offset_t pa; 3285 vm_size_t size; 3286{ 3287 vm_offset_t va, tmpva; 3288 unsigned *pte; 3289 3290 size = roundup(size, PAGE_SIZE); 3291 3292 va = kmem_alloc_pageable(kernel_map, size); 3293#if !defined(MAX_PERF) 3294 if (!va) 3295 panic("pmap_mapdev: Couldn't alloc kernel virtual memory"); 3296#endif 3297 3298 pa = pa & PG_FRAME; 3299 for (tmpva = va; size > 0;) { 3300 pte = (unsigned *)vtopte(tmpva); 3301 *pte = pa | PG_RW | PG_V | pgeflag; 3302 size -= PAGE_SIZE; 3303 tmpva += PAGE_SIZE; 3304 pa += PAGE_SIZE; 3305 } 3306 invltlb(); 3307 3308 return ((void *) va); 3309} 3310 3311/* 3312 * perform the pmap work for mincore 3313 */ 3314int 3315pmap_mincore(pmap, addr) 3316 pmap_t pmap; 3317 vm_offset_t addr; 3318{ 3319 3320 unsigned *ptep, pte; 3321 vm_page_t m; 3322 int val = 0; 3323 3324 ptep = pmap_pte(pmap, addr); 3325 if (ptep == 0) { 3326 return 0; 3327 } 3328 3329 if ((pte = *ptep) != 0) { 3330 pv_table_t *ppv; 3331 vm_offset_t pa; 3332 3333 val = MINCORE_INCORE; 3334 if ((pte & PG_MANAGED) == 0) 3335 return val; 3336 3337 pa = pte & PG_FRAME; 3338 3339 ppv = pa_to_pvh((pa & PG_FRAME)); 3340 m = ppv->pv_vm_page; 3341 3342 /* 3343 * Modified by us 3344 */ 3345 if (pte & PG_M) 3346 val |= MINCORE_MODIFIED|MINCORE_MODIFIED_OTHER; 3347 /* 3348 * Modified by someone 3349 */ 3350 else if (m->dirty || pmap_is_modified(pa)) 3351 val |= MINCORE_MODIFIED_OTHER; 3352 /* 3353 * Referenced by us 3354 */ 3355 if (pte & PG_A) 3356 val |= MINCORE_REFERENCED|MINCORE_REFERENCED_OTHER; 3357 3358 /* 3359 * Referenced by someone 3360 */ 3361 else if ((m->flags & PG_REFERENCED) || pmap_ts_referenced(pa)) { 3362 val |= MINCORE_REFERENCED_OTHER; 3363 vm_page_flag_set(m, PG_REFERENCED); 3364 } 3365 } 3366 return val; 3367} 3368 3369void 3370pmap_activate(struct proc *p) 3371{ 3372 pmap_t pmap; 3373 3374 pmap = vmspace_pmap(p->p_vmspace); 3375#if defined(SMP) 3376 pmap->pm_active |= 1 << cpuid; 3377#else 3378 pmap->pm_active |= 1; 3379#endif 3380#if defined(SWTCH_OPTIM_STATS) 3381 tlb_flush_count++; 3382#endif 3383 load_cr3(p->p_addr->u_pcb.pcb_cr3 = vtophys(pmap->pm_pdir)); 3384} 3385 3386vm_offset_t 3387pmap_addr_hint(vm_object_t obj, vm_offset_t addr, vm_size_t size) { 3388 3389 if ((obj == NULL) || (size < NBPDR) || (obj->type != OBJT_DEVICE)) { 3390 return addr; 3391 } 3392 3393 addr = (addr + (NBPDR - 1)) & ~(NBPDR - 1); 3394 return addr; 3395} 3396 3397 3398#if defined(PMAP_DEBUG) 3399pmap_pid_dump(int pid) { 3400 pmap_t pmap; 3401 struct proc *p; 3402 int npte = 0; 3403 int index; 3404 for (p = allproc.lh_first; p != NULL; p = p->p_list.le_next) { 3405 if (p->p_pid != pid) 3406 continue; 3407 3408 if (p->p_vmspace) { 3409 int i,j; 3410 index = 0; 3411 pmap = vmspace_pmap(p->p_vmspace); 3412 for(i=0;i<1024;i++) { 3413 pd_entry_t *pde; 3414 unsigned *pte; 3415 unsigned base = i << PDRSHIFT; 3416 3417 pde = &pmap->pm_pdir[i]; 3418 if (pde && pmap_pde_v(pde)) { 3419 for(j=0;j<1024;j++) { 3420 unsigned va = base + (j << PAGE_SHIFT); 3421 if (va >= (vm_offset_t) VM_MIN_KERNEL_ADDRESS) { 3422 if (index) { 3423 index = 0; 3424 printf("\n"); 3425 } 3426 return npte; 3427 } 3428 pte = pmap_pte_quick( pmap, va); 3429 if (pte && pmap_pte_v(pte)) { 3430 vm_offset_t pa; 3431 vm_page_t m; 3432 pa = *(int *)pte; 3433 m = PHYS_TO_VM_PAGE((pa & PG_FRAME)); 3434 printf("va: 0x%x, pt: 0x%x, h: %d, w: %d, f: 0x%x", 3435 va, pa, m->hold_count, m->wire_count, m->flags); 3436 npte++; 3437 index++; 3438 if (index >= 2) { 3439 index = 0; 3440 printf("\n"); 3441 } else { 3442 printf(" "); 3443 } 3444 } 3445 } 3446 } 3447 } 3448 } 3449 } 3450 return npte; 3451} 3452#endif 3453 3454#if defined(DEBUG) 3455 3456static void pads __P((pmap_t pm)); 3457void pmap_pvdump __P((vm_offset_t pa)); 3458 3459/* print address space of pmap*/ 3460static void 3461pads(pm) 3462 pmap_t pm; 3463{ 3464 unsigned va, i, j; 3465 unsigned *ptep; 3466 3467 if (pm == kernel_pmap) 3468 return; 3469 for (i = 0; i < 1024; i++) 3470 if (pm->pm_pdir[i]) 3471 for (j = 0; j < 1024; j++) { 3472 va = (i << PDRSHIFT) + (j << PAGE_SHIFT); 3473 if (pm == kernel_pmap && va < KERNBASE) 3474 continue; 3475 if (pm != kernel_pmap && va > UPT_MAX_ADDRESS) 3476 continue; 3477 ptep = pmap_pte_quick(pm, va); 3478 if (pmap_pte_v(ptep)) 3479 printf("%x:%x ", va, *(int *) ptep); 3480 }; 3481 3482} 3483 3484void 3485pmap_pvdump(pa) 3486 vm_offset_t pa; 3487{ 3488 pv_table_t *ppv; 3489 register pv_entry_t pv; 3490 3491 printf("pa %x", pa); 3492 ppv = pa_to_pvh(pa); 3493 for (pv = TAILQ_FIRST(&ppv->pv_list); 3494 pv; 3495 pv = TAILQ_NEXT(pv, pv_list)) { 3496#ifdef used_to_be 3497 printf(" -> pmap %p, va %x, flags %x", 3498 (void *)pv->pv_pmap, pv->pv_va, pv->pv_flags); 3499#endif 3500 printf(" -> pmap %p, va %x", (void *)pv->pv_pmap, pv->pv_va); 3501 pads(pv->pv_pmap); 3502 } 3503 printf(" "); 3504} 3505#endif 3506