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| Current File : //usr/src/sys/amd64/amd64/pmap.c |
/*-
* Copyright (c) 1991 Regents of the University of California.
* All rights reserved.
* Copyright (c) 1994 John S. Dyson
* All rights reserved.
* Copyright (c) 1994 David Greenman
* All rights reserved.
* Copyright (c) 2003 Peter Wemm
* All rights reserved.
* Copyright (c) 2005-2010 Alan L. Cox <alc@cs.rice.edu>
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department and William Jolitz of UUNET Technologies Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* from: @(#)pmap.c 7.7 (Berkeley) 5/12/91
*/
/*-
* Copyright (c) 2003 Networks Associates Technology, Inc.
* All rights reserved.
*
* This software was developed for the FreeBSD Project by Jake Burkholder,
* Safeport Network Services, and Network Associates Laboratories, the
* Security Research Division of Network Associates, Inc. under
* DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the DARPA
* CHATS research program.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/amd64/amd64/pmap.c 238006 2012-07-02 17:37:40Z alc $");
/*
* Manages physical address maps.
*
* In addition to hardware address maps, this
* module is called upon to provide software-use-only
* maps which may or may not be stored in the same
* form as hardware maps. These pseudo-maps are
* used to store intermediate results from copy
* operations to and from address spaces.
*
* Since the information managed by this module is
* also stored by the logical address mapping module,
* this module may throw away valid virtual-to-physical
* mappings at almost any time. However, invalidations
* of virtual-to-physical mappings must be done as
* requested.
*
* In order to cope with hardware architectures which
* make virtual-to-physical map invalidates expensive,
* this module may delay invalidate or reduced protection
* operations until such time as they are actually
* necessary. This module is given full information as
* to which processors are currently using which maps,
* and to when physical maps must be made correct.
*/
#include "opt_pmap.h"
#include "opt_vm.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/ktr.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mman.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/rwlock.h>
#include <sys/sx.h>
#include <sys/vmmeter.h>
#include <sys/sched.h>
#include <sys/sysctl.h>
#ifdef SMP
#include <sys/smp.h>
#else
#include <sys/cpuset.h>
#endif
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_kern.h>
#include <vm/vm_page.h>
#include <vm/vm_map.h>
#include <vm/vm_object.h>
#include <vm/vm_extern.h>
#include <vm/vm_pageout.h>
#include <vm/vm_pager.h>
#include <vm/vm_reserv.h>
#include <vm/uma.h>
#include <machine/cpu.h>
#include <machine/cputypes.h>
#include <machine/md_var.h>
#include <machine/pcb.h>
#include <machine/specialreg.h>
#ifdef SMP
#include <machine/smp.h>
#endif
#if !defined(DIAGNOSTIC)
#ifdef __GNUC_GNU_INLINE__
#define PMAP_INLINE __attribute__((__gnu_inline__)) inline
#else
#define PMAP_INLINE extern inline
#endif
#else
#define PMAP_INLINE
#endif
#ifdef PV_STATS
#define PV_STAT(x) do { x ; } while (0)
#else
#define PV_STAT(x) do { } while (0)
#endif
#define pa_index(pa) ((pa) >> PDRSHIFT)
#define pa_to_pvh(pa) (&pv_table[pa_index(pa)])
struct pmap kernel_pmap_store;
vm_offset_t virtual_avail; /* VA of first avail page (after kernel bss) */
vm_offset_t virtual_end; /* VA of last avail page (end of kernel AS) */
static int ndmpdp;
static vm_paddr_t dmaplimit;
vm_offset_t kernel_vm_end = VM_MIN_KERNEL_ADDRESS;
pt_entry_t pg_nx;
SYSCTL_NODE(_vm, OID_AUTO, pmap, CTLFLAG_RD, 0, "VM/pmap parameters");
static int pat_works = 1;
SYSCTL_INT(_vm_pmap, OID_AUTO, pat_works, CTLFLAG_RD, &pat_works, 1,
"Is page attribute table fully functional?");
static int pg_ps_enabled = 1;
SYSCTL_INT(_vm_pmap, OID_AUTO, pg_ps_enabled, CTLFLAG_RDTUN, &pg_ps_enabled, 0,
"Are large page mappings enabled?");
#define PAT_INDEX_SIZE 8
static int pat_index[PAT_INDEX_SIZE]; /* cache mode to PAT index conversion */
static u_int64_t KPTphys; /* phys addr of kernel level 1 */
static u_int64_t KPDphys; /* phys addr of kernel level 2 */
u_int64_t KPDPphys; /* phys addr of kernel level 3 */
u_int64_t KPML4phys; /* phys addr of kernel level 4 */
static u_int64_t DMPDphys; /* phys addr of direct mapped level 2 */
static u_int64_t DMPDPphys; /* phys addr of direct mapped level 3 */
/*
* Isolate the global pv list lock from data and other locks to prevent false
* sharing within the cache.
*/
static struct {
struct rwlock lock;
char padding[CACHE_LINE_SIZE - sizeof(struct rwlock)];
} pvh_global __aligned(CACHE_LINE_SIZE);
#define pvh_global_lock pvh_global.lock
/*
* Data for the pv entry allocation mechanism
*/
static TAILQ_HEAD(pch, pv_chunk) pv_chunks = TAILQ_HEAD_INITIALIZER(pv_chunks);
static long pv_entry_count;
static struct md_page *pv_table;
/*
* All those kernel PT submaps that BSD is so fond of
*/
pt_entry_t *CMAP1 = 0;
caddr_t CADDR1 = 0;
/*
* Crashdump maps.
*/
static caddr_t crashdumpmap;
static void free_pv_chunk(struct pv_chunk *pc);
static void free_pv_entry(pmap_t pmap, pv_entry_t pv);
static pv_entry_t get_pv_entry(pmap_t pmap, boolean_t try);
static void pmap_pv_demote_pde(pmap_t pmap, vm_offset_t va, vm_paddr_t pa);
static boolean_t pmap_pv_insert_pde(pmap_t pmap, vm_offset_t va, vm_paddr_t pa);
static void pmap_pv_promote_pde(pmap_t pmap, vm_offset_t va, vm_paddr_t pa);
static void pmap_pvh_free(struct md_page *pvh, pmap_t pmap, vm_offset_t va);
static pv_entry_t pmap_pvh_remove(struct md_page *pvh, pmap_t pmap,
vm_offset_t va);
static int pmap_pvh_wired_mappings(struct md_page *pvh, int count);
static int pmap_change_attr_locked(vm_offset_t va, vm_size_t size, int mode);
static boolean_t pmap_demote_pde(pmap_t pmap, pd_entry_t *pde, vm_offset_t va);
static boolean_t pmap_demote_pdpe(pmap_t pmap, pdp_entry_t *pdpe,
vm_offset_t va);
static boolean_t pmap_enter_pde(pmap_t pmap, vm_offset_t va, vm_page_t m,
vm_prot_t prot);
static vm_page_t pmap_enter_quick_locked(pmap_t pmap, vm_offset_t va,
vm_page_t m, vm_prot_t prot, vm_page_t mpte);
static void pmap_fill_ptp(pt_entry_t *firstpte, pt_entry_t newpte);
static void pmap_insert_pt_page(pmap_t pmap, vm_page_t mpte);
static boolean_t pmap_is_modified_pvh(struct md_page *pvh);
static boolean_t pmap_is_referenced_pvh(struct md_page *pvh);
static void pmap_kenter_attr(vm_offset_t va, vm_paddr_t pa, int mode);
static vm_page_t pmap_lookup_pt_page(pmap_t pmap, vm_offset_t va);
static void pmap_pde_attr(pd_entry_t *pde, int cache_bits);
static void pmap_promote_pde(pmap_t pmap, pd_entry_t *pde, vm_offset_t va);
static boolean_t pmap_protect_pde(pmap_t pmap, pd_entry_t *pde, vm_offset_t sva,
vm_prot_t prot);
static void pmap_pte_attr(pt_entry_t *pte, int cache_bits);
static int pmap_remove_pde(pmap_t pmap, pd_entry_t *pdq, vm_offset_t sva,
vm_page_t *free);
static int pmap_remove_pte(pmap_t pmap, pt_entry_t *ptq,
vm_offset_t sva, pd_entry_t ptepde, vm_page_t *free);
static void pmap_remove_pt_page(pmap_t pmap, vm_page_t mpte);
static void pmap_remove_page(pmap_t pmap, vm_offset_t va, pd_entry_t *pde,
vm_page_t *free);
static void pmap_remove_entry(struct pmap *pmap, vm_page_t m,
vm_offset_t va);
static void pmap_insert_entry(pmap_t pmap, vm_offset_t va, vm_page_t m);
static boolean_t pmap_try_insert_pv_entry(pmap_t pmap, vm_offset_t va,
vm_page_t m);
static void pmap_update_pde(pmap_t pmap, vm_offset_t va, pd_entry_t *pde,
pd_entry_t newpde);
static void pmap_update_pde_invalidate(vm_offset_t va, pd_entry_t newpde);
static vm_page_t pmap_allocpde(pmap_t pmap, vm_offset_t va, int flags);
static vm_page_t pmap_allocpte(pmap_t pmap, vm_offset_t va, int flags);
static vm_page_t _pmap_allocpte(pmap_t pmap, vm_pindex_t ptepindex, int flags);
static int _pmap_unwire_pte_hold(pmap_t pmap, vm_offset_t va, vm_page_t m,
vm_page_t* free);
static int pmap_unuse_pt(pmap_t, vm_offset_t, pd_entry_t, vm_page_t *);
static vm_offset_t pmap_kmem_choose(vm_offset_t addr);
CTASSERT(1 << PDESHIFT == sizeof(pd_entry_t));
CTASSERT(1 << PTESHIFT == sizeof(pt_entry_t));
/*
* Move the kernel virtual free pointer to the next
* 2MB. This is used to help improve performance
* by using a large (2MB) page for much of the kernel
* (.text, .data, .bss)
*/
static vm_offset_t
pmap_kmem_choose(vm_offset_t addr)
{
vm_offset_t newaddr = addr;
newaddr = (addr + (NBPDR - 1)) & ~(NBPDR - 1);
return (newaddr);
}
/********************/
/* Inline functions */
/********************/
/* Return a non-clipped PD index for a given VA */
static __inline vm_pindex_t
pmap_pde_pindex(vm_offset_t va)
{
return (va >> PDRSHIFT);
}
/* Return various clipped indexes for a given VA */
static __inline vm_pindex_t
pmap_pte_index(vm_offset_t va)
{
return ((va >> PAGE_SHIFT) & ((1ul << NPTEPGSHIFT) - 1));
}
static __inline vm_pindex_t
pmap_pde_index(vm_offset_t va)
{
return ((va >> PDRSHIFT) & ((1ul << NPDEPGSHIFT) - 1));
}
static __inline vm_pindex_t
pmap_pdpe_index(vm_offset_t va)
{
return ((va >> PDPSHIFT) & ((1ul << NPDPEPGSHIFT) - 1));
}
static __inline vm_pindex_t
pmap_pml4e_index(vm_offset_t va)
{
return ((va >> PML4SHIFT) & ((1ul << NPML4EPGSHIFT) - 1));
}
/* Return a pointer to the PML4 slot that corresponds to a VA */
static __inline pml4_entry_t *
pmap_pml4e(pmap_t pmap, vm_offset_t va)
{
return (&pmap->pm_pml4[pmap_pml4e_index(va)]);
}
/* Return a pointer to the PDP slot that corresponds to a VA */
static __inline pdp_entry_t *
pmap_pml4e_to_pdpe(pml4_entry_t *pml4e, vm_offset_t va)
{
pdp_entry_t *pdpe;
pdpe = (pdp_entry_t *)PHYS_TO_DMAP(*pml4e & PG_FRAME);
return (&pdpe[pmap_pdpe_index(va)]);
}
/* Return a pointer to the PDP slot that corresponds to a VA */
static __inline pdp_entry_t *
pmap_pdpe(pmap_t pmap, vm_offset_t va)
{
pml4_entry_t *pml4e;
pml4e = pmap_pml4e(pmap, va);
if ((*pml4e & PG_V) == 0)
return (NULL);
return (pmap_pml4e_to_pdpe(pml4e, va));
}
/* Return a pointer to the PD slot that corresponds to a VA */
static __inline pd_entry_t *
pmap_pdpe_to_pde(pdp_entry_t *pdpe, vm_offset_t va)
{
pd_entry_t *pde;
pde = (pd_entry_t *)PHYS_TO_DMAP(*pdpe & PG_FRAME);
return (&pde[pmap_pde_index(va)]);
}
/* Return a pointer to the PD slot that corresponds to a VA */
static __inline pd_entry_t *
pmap_pde(pmap_t pmap, vm_offset_t va)
{
pdp_entry_t *pdpe;
pdpe = pmap_pdpe(pmap, va);
if (pdpe == NULL || (*pdpe & PG_V) == 0)
return (NULL);
return (pmap_pdpe_to_pde(pdpe, va));
}
/* Return a pointer to the PT slot that corresponds to a VA */
static __inline pt_entry_t *
pmap_pde_to_pte(pd_entry_t *pde, vm_offset_t va)
{
pt_entry_t *pte;
pte = (pt_entry_t *)PHYS_TO_DMAP(*pde & PG_FRAME);
return (&pte[pmap_pte_index(va)]);
}
/* Return a pointer to the PT slot that corresponds to a VA */
static __inline pt_entry_t *
pmap_pte(pmap_t pmap, vm_offset_t va)
{
pd_entry_t *pde;
pde = pmap_pde(pmap, va);
if (pde == NULL || (*pde & PG_V) == 0)
return (NULL);
if ((*pde & PG_PS) != 0) /* compat with i386 pmap_pte() */
return ((pt_entry_t *)pde);
return (pmap_pde_to_pte(pde, va));
}
static __inline void
pmap_resident_count_inc(pmap_t pmap, int count)
{
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
pmap->pm_stats.resident_count += count;
}
static __inline void
pmap_resident_count_dec(pmap_t pmap, int count)
{
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
pmap->pm_stats.resident_count -= count;
}
PMAP_INLINE pt_entry_t *
vtopte(vm_offset_t va)
{
u_int64_t mask = ((1ul << (NPTEPGSHIFT + NPDEPGSHIFT + NPDPEPGSHIFT + NPML4EPGSHIFT)) - 1);
return (PTmap + ((va >> PAGE_SHIFT) & mask));
}
static __inline pd_entry_t *
vtopde(vm_offset_t va)
{
u_int64_t mask = ((1ul << (NPDEPGSHIFT + NPDPEPGSHIFT + NPML4EPGSHIFT)) - 1);
return (PDmap + ((va >> PDRSHIFT) & mask));
}
static u_int64_t
allocpages(vm_paddr_t *firstaddr, int n)
{
u_int64_t ret;
ret = *firstaddr;
bzero((void *)ret, n * PAGE_SIZE);
*firstaddr += n * PAGE_SIZE;
return (ret);
}
CTASSERT(powerof2(NDMPML4E));
static void
create_pagetables(vm_paddr_t *firstaddr)
{
int i, j, ndm1g;
/* Allocate pages */
KPTphys = allocpages(firstaddr, NKPT);
KPML4phys = allocpages(firstaddr, 1);
KPDPphys = allocpages(firstaddr, NKPML4E);
KPDphys = allocpages(firstaddr, NKPDPE);
ndmpdp = (ptoa(Maxmem) + NBPDP - 1) >> PDPSHIFT;
if (ndmpdp < 4) /* Minimum 4GB of dirmap */
ndmpdp = 4;
DMPDPphys = allocpages(firstaddr, NDMPML4E);
ndm1g = 0;
if ((amd_feature & AMDID_PAGE1GB) != 0)
ndm1g = ptoa(Maxmem) >> PDPSHIFT;
if (ndm1g < ndmpdp)
DMPDphys = allocpages(firstaddr, ndmpdp - ndm1g);
dmaplimit = (vm_paddr_t)ndmpdp << PDPSHIFT;
/* Fill in the underlying page table pages */
/* Read-only from zero to physfree */
/* XXX not fully used, underneath 2M pages */
for (i = 0; (i << PAGE_SHIFT) < *firstaddr; i++) {
((pt_entry_t *)KPTphys)[i] = i << PAGE_SHIFT;
((pt_entry_t *)KPTphys)[i] |= PG_RW | PG_V | PG_G;
}
/* Now map the page tables at their location within PTmap */
for (i = 0; i < NKPT; i++) {
((pd_entry_t *)KPDphys)[i] = KPTphys + (i << PAGE_SHIFT);
((pd_entry_t *)KPDphys)[i] |= PG_RW | PG_V;
}
/* Map from zero to end of allocations under 2M pages */
/* This replaces some of the KPTphys entries above */
for (i = 0; (i << PDRSHIFT) < *firstaddr; i++) {
((pd_entry_t *)KPDphys)[i] = i << PDRSHIFT;
((pd_entry_t *)KPDphys)[i] |= PG_RW | PG_V | PG_PS | PG_G;
}
/* And connect up the PD to the PDP */
for (i = 0; i < NKPDPE; i++) {
((pdp_entry_t *)KPDPphys)[i + KPDPI] = KPDphys +
(i << PAGE_SHIFT);
((pdp_entry_t *)KPDPphys)[i + KPDPI] |= PG_RW | PG_V | PG_U;
}
/*
* Now, set up the direct map region using 2MB and/or 1GB pages. If
* the end of physical memory is not aligned to a 1GB page boundary,
* then the residual physical memory is mapped with 2MB pages. Later,
* if pmap_mapdev{_attr}() uses the direct map for non-write-back
* memory, pmap_change_attr() will demote any 2MB or 1GB page mappings
* that are partially used.
*/
for (i = NPDEPG * ndm1g, j = 0; i < NPDEPG * ndmpdp; i++, j++) {
((pd_entry_t *)DMPDphys)[j] = (vm_paddr_t)i << PDRSHIFT;
/* Preset PG_M and PG_A because demotion expects it. */
((pd_entry_t *)DMPDphys)[j] |= PG_RW | PG_V | PG_PS | PG_G |
PG_M | PG_A;
}
for (i = 0; i < ndm1g; i++) {
((pdp_entry_t *)DMPDPphys)[i] = (vm_paddr_t)i << PDPSHIFT;
/* Preset PG_M and PG_A because demotion expects it. */
((pdp_entry_t *)DMPDPphys)[i] |= PG_RW | PG_V | PG_PS | PG_G |
PG_M | PG_A;
}
for (j = 0; i < ndmpdp; i++, j++) {
((pdp_entry_t *)DMPDPphys)[i] = DMPDphys + (j << PAGE_SHIFT);
((pdp_entry_t *)DMPDPphys)[i] |= PG_RW | PG_V | PG_U;
}
/* And recursively map PML4 to itself in order to get PTmap */
((pdp_entry_t *)KPML4phys)[PML4PML4I] = KPML4phys;
((pdp_entry_t *)KPML4phys)[PML4PML4I] |= PG_RW | PG_V | PG_U;
/* Connect the Direct Map slot(s) up to the PML4. */
for (i = 0; i < NDMPML4E; i++) {
((pdp_entry_t *)KPML4phys)[DMPML4I + i] = DMPDPphys +
(i << PAGE_SHIFT);
((pdp_entry_t *)KPML4phys)[DMPML4I + i] |= PG_RW | PG_V | PG_U;
}
/* Connect the KVA slot up to the PML4 */
((pdp_entry_t *)KPML4phys)[KPML4I] = KPDPphys;
((pdp_entry_t *)KPML4phys)[KPML4I] |= PG_RW | PG_V | PG_U;
}
/*
* Bootstrap the system enough to run with virtual memory.
*
* On amd64 this is called after mapping has already been enabled
* and just syncs the pmap module with what has already been done.
* [We can't call it easily with mapping off since the kernel is not
* mapped with PA == VA, hence we would have to relocate every address
* from the linked base (virtual) address "KERNBASE" to the actual
* (physical) address starting relative to 0]
*/
void
pmap_bootstrap(vm_paddr_t *firstaddr)
{
vm_offset_t va;
pt_entry_t *pte, *unused;
/*
* Create an initial set of page tables to run the kernel in.
*/
create_pagetables(firstaddr);
virtual_avail = (vm_offset_t) KERNBASE + *firstaddr;
virtual_avail = pmap_kmem_choose(virtual_avail);
virtual_end = VM_MAX_KERNEL_ADDRESS;
/* XXX do %cr0 as well */
load_cr4(rcr4() | CR4_PGE | CR4_PSE);
load_cr3(KPML4phys);
/*
* Initialize the kernel pmap (which is statically allocated).
*/
PMAP_LOCK_INIT(kernel_pmap);
kernel_pmap->pm_pml4 = (pdp_entry_t *)PHYS_TO_DMAP(KPML4phys);
kernel_pmap->pm_root = NULL;
CPU_FILL(&kernel_pmap->pm_active); /* don't allow deactivation */
TAILQ_INIT(&kernel_pmap->pm_pvchunk);
/*
* Initialize the global pv list lock.
*/
rw_init(&pvh_global_lock, "pvh global");
/*
* Reserve some special page table entries/VA space for temporary
* mapping of pages.
*/
#define SYSMAP(c, p, v, n) \
v = (c)va; va += ((n)*PAGE_SIZE); p = pte; pte += (n);
va = virtual_avail;
pte = vtopte(va);
/*
* CMAP1 is only used for the memory test.
*/
SYSMAP(caddr_t, CMAP1, CADDR1, 1)
/*
* Crashdump maps.
*/
SYSMAP(caddr_t, unused, crashdumpmap, MAXDUMPPGS)
virtual_avail = va;
/* Initialize the PAT MSR. */
pmap_init_pat();
}
/*
* Setup the PAT MSR.
*/
void
pmap_init_pat(void)
{
int pat_table[PAT_INDEX_SIZE];
uint64_t pat_msr;
u_long cr0, cr4;
int i;
/* Bail if this CPU doesn't implement PAT. */
if ((cpu_feature & CPUID_PAT) == 0)
panic("no PAT??");
/* Set default PAT index table. */
for (i = 0; i < PAT_INDEX_SIZE; i++)
pat_table[i] = -1;
pat_table[PAT_WRITE_BACK] = 0;
pat_table[PAT_WRITE_THROUGH] = 1;
pat_table[PAT_UNCACHEABLE] = 3;
pat_table[PAT_WRITE_COMBINING] = 3;
pat_table[PAT_WRITE_PROTECTED] = 3;
pat_table[PAT_UNCACHED] = 3;
/* Initialize default PAT entries. */
pat_msr = PAT_VALUE(0, PAT_WRITE_BACK) |
PAT_VALUE(1, PAT_WRITE_THROUGH) |
PAT_VALUE(2, PAT_UNCACHED) |
PAT_VALUE(3, PAT_UNCACHEABLE) |
PAT_VALUE(4, PAT_WRITE_BACK) |
PAT_VALUE(5, PAT_WRITE_THROUGH) |
PAT_VALUE(6, PAT_UNCACHED) |
PAT_VALUE(7, PAT_UNCACHEABLE);
if (pat_works) {
/*
* Leave the indices 0-3 at the default of WB, WT, UC-, and UC.
* Program 5 and 6 as WP and WC.
* Leave 4 and 7 as WB and UC.
*/
pat_msr &= ~(PAT_MASK(5) | PAT_MASK(6));
pat_msr |= PAT_VALUE(5, PAT_WRITE_PROTECTED) |
PAT_VALUE(6, PAT_WRITE_COMBINING);
pat_table[PAT_UNCACHED] = 2;
pat_table[PAT_WRITE_PROTECTED] = 5;
pat_table[PAT_WRITE_COMBINING] = 6;
} else {
/*
* Just replace PAT Index 2 with WC instead of UC-.
*/
pat_msr &= ~PAT_MASK(2);
pat_msr |= PAT_VALUE(2, PAT_WRITE_COMBINING);
pat_table[PAT_WRITE_COMBINING] = 2;
}
/* Disable PGE. */
cr4 = rcr4();
load_cr4(cr4 & ~CR4_PGE);
/* Disable caches (CD = 1, NW = 0). */
cr0 = rcr0();
load_cr0((cr0 & ~CR0_NW) | CR0_CD);
/* Flushes caches and TLBs. */
wbinvd();
invltlb();
/* Update PAT and index table. */
wrmsr(MSR_PAT, pat_msr);
for (i = 0; i < PAT_INDEX_SIZE; i++)
pat_index[i] = pat_table[i];
/* Flush caches and TLBs again. */
wbinvd();
invltlb();
/* Restore caches and PGE. */
load_cr0(cr0);
load_cr4(cr4);
}
/*
* Initialize a vm_page's machine-dependent fields.
*/
void
pmap_page_init(vm_page_t m)
{
TAILQ_INIT(&m->md.pv_list);
m->md.pat_mode = PAT_WRITE_BACK;
}
/*
* Initialize the pmap module.
* Called by vm_init, to initialize any structures that the pmap
* system needs to map virtual memory.
*/
void
pmap_init(void)
{
vm_page_t mpte;
vm_size_t s;
int i, pv_npg;
/*
* Initialize the vm page array entries for the kernel pmap's
* page table pages.
*/
for (i = 0; i < NKPT; i++) {
mpte = PHYS_TO_VM_PAGE(KPTphys + (i << PAGE_SHIFT));
KASSERT(mpte >= vm_page_array &&
mpte < &vm_page_array[vm_page_array_size],
("pmap_init: page table page is out of range"));
mpte->pindex = pmap_pde_pindex(KERNBASE) + i;
mpte->phys_addr = KPTphys + (i << PAGE_SHIFT);
}
/*
* If the kernel is running in a virtual machine on an AMD Family 10h
* processor, then it must assume that MCA is enabled by the virtual
* machine monitor.
*/
if (vm_guest == VM_GUEST_VM && cpu_vendor_id == CPU_VENDOR_AMD &&
CPUID_TO_FAMILY(cpu_id) == 0x10)
workaround_erratum383 = 1;
/*
* Are large page mappings enabled?
*/
TUNABLE_INT_FETCH("vm.pmap.pg_ps_enabled", &pg_ps_enabled);
if (pg_ps_enabled) {
KASSERT(MAXPAGESIZES > 1 && pagesizes[1] == 0,
("pmap_init: can't assign to pagesizes[1]"));
pagesizes[1] = NBPDR;
}
/*
* Calculate the size of the pv head table for superpages.
*/
for (i = 0; phys_avail[i + 1]; i += 2);
pv_npg = round_2mpage(phys_avail[(i - 2) + 1]) / NBPDR;
/*
* Allocate memory for the pv head table for superpages.
*/
s = (vm_size_t)(pv_npg * sizeof(struct md_page));
s = round_page(s);
pv_table = (struct md_page *)kmem_alloc(kernel_map, s);
for (i = 0; i < pv_npg; i++)
TAILQ_INIT(&pv_table[i].pv_list);
}
SYSCTL_NODE(_vm_pmap, OID_AUTO, pde, CTLFLAG_RD, 0,
"2MB page mapping counters");
static u_long pmap_pde_demotions;
SYSCTL_ULONG(_vm_pmap_pde, OID_AUTO, demotions, CTLFLAG_RD,
&pmap_pde_demotions, 0, "2MB page demotions");
static u_long pmap_pde_mappings;
SYSCTL_ULONG(_vm_pmap_pde, OID_AUTO, mappings, CTLFLAG_RD,
&pmap_pde_mappings, 0, "2MB page mappings");
static u_long pmap_pde_p_failures;
SYSCTL_ULONG(_vm_pmap_pde, OID_AUTO, p_failures, CTLFLAG_RD,
&pmap_pde_p_failures, 0, "2MB page promotion failures");
static u_long pmap_pde_promotions;
SYSCTL_ULONG(_vm_pmap_pde, OID_AUTO, promotions, CTLFLAG_RD,
&pmap_pde_promotions, 0, "2MB page promotions");
SYSCTL_NODE(_vm_pmap, OID_AUTO, pdpe, CTLFLAG_RD, 0,
"1GB page mapping counters");
static u_long pmap_pdpe_demotions;
SYSCTL_ULONG(_vm_pmap_pdpe, OID_AUTO, demotions, CTLFLAG_RD,
&pmap_pdpe_demotions, 0, "1GB page demotions");
/***************************************************
* Low level helper routines.....
***************************************************/
/*
* Determine the appropriate bits to set in a PTE or PDE for a specified
* caching mode.
*/
static int
pmap_cache_bits(int mode, boolean_t is_pde)
{
int cache_bits, pat_flag, pat_idx;
if (mode < 0 || mode >= PAT_INDEX_SIZE || pat_index[mode] < 0)
panic("Unknown caching mode %d\n", mode);
/* The PAT bit is different for PTE's and PDE's. */
pat_flag = is_pde ? PG_PDE_PAT : PG_PTE_PAT;
/* Map the caching mode to a PAT index. */
pat_idx = pat_index[mode];
/* Map the 3-bit index value into the PAT, PCD, and PWT bits. */
cache_bits = 0;
if (pat_idx & 0x4)
cache_bits |= pat_flag;
if (pat_idx & 0x2)
cache_bits |= PG_NC_PCD;
if (pat_idx & 0x1)
cache_bits |= PG_NC_PWT;
return (cache_bits);
}
/*
* After changing the page size for the specified virtual address in the page
* table, flush the corresponding entries from the processor's TLB. Only the
* calling processor's TLB is affected.
*
* The calling thread must be pinned to a processor.
*/
static void
pmap_update_pde_invalidate(vm_offset_t va, pd_entry_t newpde)
{
u_long cr4;
if ((newpde & PG_PS) == 0)
/* Demotion: flush a specific 2MB page mapping. */
invlpg(va);
else if ((newpde & PG_G) == 0)
/*
* Promotion: flush every 4KB page mapping from the TLB
* because there are too many to flush individually.
*/
invltlb();
else {
/*
* Promotion: flush every 4KB page mapping from the TLB,
* including any global (PG_G) mappings.
*/
cr4 = rcr4();
load_cr4(cr4 & ~CR4_PGE);
/*
* Although preemption at this point could be detrimental to
* performance, it would not lead to an error. PG_G is simply
* ignored if CR4.PGE is clear. Moreover, in case this block
* is re-entered, the load_cr4() either above or below will
* modify CR4.PGE flushing the TLB.
*/
load_cr4(cr4 | CR4_PGE);
}
}
#ifdef SMP
/*
* For SMP, these functions have to use the IPI mechanism for coherence.
*
* N.B.: Before calling any of the following TLB invalidation functions,
* the calling processor must ensure that all stores updating a non-
* kernel page table are globally performed. Otherwise, another
* processor could cache an old, pre-update entry without being
* invalidated. This can happen one of two ways: (1) The pmap becomes
* active on another processor after its pm_active field is checked by
* one of the following functions but before a store updating the page
* table is globally performed. (2) The pmap becomes active on another
* processor before its pm_active field is checked but due to
* speculative loads one of the following functions stills reads the
* pmap as inactive on the other processor.
*
* The kernel page table is exempt because its pm_active field is
* immutable. The kernel page table is always active on every
* processor.
*/
void
pmap_invalidate_page(pmap_t pmap, vm_offset_t va)
{
cpuset_t other_cpus;
u_int cpuid;
sched_pin();
if (pmap == kernel_pmap || !CPU_CMP(&pmap->pm_active, &all_cpus)) {
invlpg(va);
smp_invlpg(va);
} else {
cpuid = PCPU_GET(cpuid);
other_cpus = all_cpus;
CPU_CLR(cpuid, &other_cpus);
if (CPU_ISSET(cpuid, &pmap->pm_active))
invlpg(va);
CPU_AND(&other_cpus, &pmap->pm_active);
if (!CPU_EMPTY(&other_cpus))
smp_masked_invlpg(other_cpus, va);
}
sched_unpin();
}
void
pmap_invalidate_range(pmap_t pmap, vm_offset_t sva, vm_offset_t eva)
{
cpuset_t other_cpus;
vm_offset_t addr;
u_int cpuid;
sched_pin();
if (pmap == kernel_pmap || !CPU_CMP(&pmap->pm_active, &all_cpus)) {
for (addr = sva; addr < eva; addr += PAGE_SIZE)
invlpg(addr);
smp_invlpg_range(sva, eva);
} else {
cpuid = PCPU_GET(cpuid);
other_cpus = all_cpus;
CPU_CLR(cpuid, &other_cpus);
if (CPU_ISSET(cpuid, &pmap->pm_active))
for (addr = sva; addr < eva; addr += PAGE_SIZE)
invlpg(addr);
CPU_AND(&other_cpus, &pmap->pm_active);
if (!CPU_EMPTY(&other_cpus))
smp_masked_invlpg_range(other_cpus, sva, eva);
}
sched_unpin();
}
void
pmap_invalidate_all(pmap_t pmap)
{
cpuset_t other_cpus;
u_int cpuid;
sched_pin();
if (pmap == kernel_pmap || !CPU_CMP(&pmap->pm_active, &all_cpus)) {
invltlb();
smp_invltlb();
} else {
cpuid = PCPU_GET(cpuid);
other_cpus = all_cpus;
CPU_CLR(cpuid, &other_cpus);
if (CPU_ISSET(cpuid, &pmap->pm_active))
invltlb();
CPU_AND(&other_cpus, &pmap->pm_active);
if (!CPU_EMPTY(&other_cpus))
smp_masked_invltlb(other_cpus);
}
sched_unpin();
}
void
pmap_invalidate_cache(void)
{
sched_pin();
wbinvd();
smp_cache_flush();
sched_unpin();
}
struct pde_action {
cpuset_t invalidate; /* processors that invalidate their TLB */
vm_offset_t va;
pd_entry_t *pde;
pd_entry_t newpde;
u_int store; /* processor that updates the PDE */
};
static void
pmap_update_pde_action(void *arg)
{
struct pde_action *act = arg;
if (act->store == PCPU_GET(cpuid))
pde_store(act->pde, act->newpde);
}
static void
pmap_update_pde_teardown(void *arg)
{
struct pde_action *act = arg;
if (CPU_ISSET(PCPU_GET(cpuid), &act->invalidate))
pmap_update_pde_invalidate(act->va, act->newpde);
}
/*
* Change the page size for the specified virtual address in a way that
* prevents any possibility of the TLB ever having two entries that map the
* same virtual address using different page sizes. This is the recommended
* workaround for Erratum 383 on AMD Family 10h processors. It prevents a
* machine check exception for a TLB state that is improperly diagnosed as a
* hardware error.
*/
static void
pmap_update_pde(pmap_t pmap, vm_offset_t va, pd_entry_t *pde, pd_entry_t newpde)
{
struct pde_action act;
cpuset_t active, other_cpus;
u_int cpuid;
sched_pin();
cpuid = PCPU_GET(cpuid);
other_cpus = all_cpus;
CPU_CLR(cpuid, &other_cpus);
if (pmap == kernel_pmap)
active = all_cpus;
else
active = pmap->pm_active;
if (CPU_OVERLAP(&active, &other_cpus)) {
act.store = cpuid;
act.invalidate = active;
act.va = va;
act.pde = pde;
act.newpde = newpde;
CPU_SET(cpuid, &active);
smp_rendezvous_cpus(active,
smp_no_rendevous_barrier, pmap_update_pde_action,
pmap_update_pde_teardown, &act);
} else {
pde_store(pde, newpde);
if (CPU_ISSET(cpuid, &active))
pmap_update_pde_invalidate(va, newpde);
}
sched_unpin();
}
#else /* !SMP */
/*
* Normal, non-SMP, invalidation functions.
* We inline these within pmap.c for speed.
*/
PMAP_INLINE void
pmap_invalidate_page(pmap_t pmap, vm_offset_t va)
{
if (pmap == kernel_pmap || !CPU_EMPTY(&pmap->pm_active))
invlpg(va);
}
PMAP_INLINE void
pmap_invalidate_range(pmap_t pmap, vm_offset_t sva, vm_offset_t eva)
{
vm_offset_t addr;
if (pmap == kernel_pmap || !CPU_EMPTY(&pmap->pm_active))
for (addr = sva; addr < eva; addr += PAGE_SIZE)
invlpg(addr);
}
PMAP_INLINE void
pmap_invalidate_all(pmap_t pmap)
{
if (pmap == kernel_pmap || !CPU_EMPTY(&pmap->pm_active))
invltlb();
}
PMAP_INLINE void
pmap_invalidate_cache(void)
{
wbinvd();
}
static void
pmap_update_pde(pmap_t pmap, vm_offset_t va, pd_entry_t *pde, pd_entry_t newpde)
{
pde_store(pde, newpde);
if (pmap == kernel_pmap || !CPU_EMPTY(&pmap->pm_active))
pmap_update_pde_invalidate(va, newpde);
}
#endif /* !SMP */
#define PMAP_CLFLUSH_THRESHOLD (2 * 1024 * 1024)
void
pmap_invalidate_cache_range(vm_offset_t sva, vm_offset_t eva)
{
KASSERT((sva & PAGE_MASK) == 0,
("pmap_invalidate_cache_range: sva not page-aligned"));
KASSERT((eva & PAGE_MASK) == 0,
("pmap_invalidate_cache_range: eva not page-aligned"));
if (cpu_feature & CPUID_SS)
; /* If "Self Snoop" is supported, do nothing. */
else if ((cpu_feature & CPUID_CLFSH) != 0 &&
eva - sva < PMAP_CLFLUSH_THRESHOLD) {
/*
* Otherwise, do per-cache line flush. Use the mfence
* instruction to insure that previous stores are
* included in the write-back. The processor
* propagates flush to other processors in the cache
* coherence domain.
*/
mfence();
for (; sva < eva; sva += cpu_clflush_line_size)
clflush(sva);
mfence();
} else {
/*
* No targeted cache flush methods are supported by CPU,
* or the supplied range is bigger than 2MB.
* Globally invalidate cache.
*/
pmap_invalidate_cache();
}
}
/*
* Remove the specified set of pages from the data and instruction caches.
*
* In contrast to pmap_invalidate_cache_range(), this function does not
* rely on the CPU's self-snoop feature, because it is intended for use
* when moving pages into a different cache domain.
*/
void
pmap_invalidate_cache_pages(vm_page_t *pages, int count)
{
vm_offset_t daddr, eva;
int i;
if (count >= PMAP_CLFLUSH_THRESHOLD / PAGE_SIZE ||
(cpu_feature & CPUID_CLFSH) == 0)
pmap_invalidate_cache();
else {
mfence();
for (i = 0; i < count; i++) {
daddr = PHYS_TO_DMAP(VM_PAGE_TO_PHYS(pages[i]));
eva = daddr + PAGE_SIZE;
for (; daddr < eva; daddr += cpu_clflush_line_size)
clflush(daddr);
}
mfence();
}
}
/*
* Are we current address space or kernel?
*/
static __inline int
pmap_is_current(pmap_t pmap)
{
return (pmap == kernel_pmap ||
(pmap->pm_pml4[PML4PML4I] & PG_FRAME) == (PML4pml4e[0] & PG_FRAME));
}
/*
* Routine: pmap_extract
* Function:
* Extract the physical page address associated
* with the given map/virtual_address pair.
*/
vm_paddr_t
pmap_extract(pmap_t pmap, vm_offset_t va)
{
pdp_entry_t *pdpe;
pd_entry_t *pde;
pt_entry_t *pte;
vm_paddr_t pa;
pa = 0;
PMAP_LOCK(pmap);
pdpe = pmap_pdpe(pmap, va);
if (pdpe != NULL && (*pdpe & PG_V) != 0) {
if ((*pdpe & PG_PS) != 0)
pa = (*pdpe & PG_PS_FRAME) | (va & PDPMASK);
else {
pde = pmap_pdpe_to_pde(pdpe, va);
if ((*pde & PG_V) != 0) {
if ((*pde & PG_PS) != 0) {
pa = (*pde & PG_PS_FRAME) |
(va & PDRMASK);
} else {
pte = pmap_pde_to_pte(pde, va);
pa = (*pte & PG_FRAME) |
(va & PAGE_MASK);
}
}
}
}
PMAP_UNLOCK(pmap);
return (pa);
}
/*
* Routine: pmap_extract_and_hold
* Function:
* Atomically extract and hold the physical page
* with the given pmap and virtual address pair
* if that mapping permits the given protection.
*/
vm_page_t
pmap_extract_and_hold(pmap_t pmap, vm_offset_t va, vm_prot_t prot)
{
pd_entry_t pde, *pdep;
pt_entry_t pte;
vm_paddr_t pa;
vm_page_t m;
pa = 0;
m = NULL;
PMAP_LOCK(pmap);
retry:
pdep = pmap_pde(pmap, va);
if (pdep != NULL && (pde = *pdep)) {
if (pde & PG_PS) {
if ((pde & PG_RW) || (prot & VM_PROT_WRITE) == 0) {
if (vm_page_pa_tryrelock(pmap, (pde &
PG_PS_FRAME) | (va & PDRMASK), &pa))
goto retry;
m = PHYS_TO_VM_PAGE((pde & PG_PS_FRAME) |
(va & PDRMASK));
vm_page_hold(m);
}
} else {
pte = *pmap_pde_to_pte(pdep, va);
if ((pte & PG_V) &&
((pte & PG_RW) || (prot & VM_PROT_WRITE) == 0)) {
if (vm_page_pa_tryrelock(pmap, pte & PG_FRAME,
&pa))
goto retry;
m = PHYS_TO_VM_PAGE(pte & PG_FRAME);
vm_page_hold(m);
}
}
}
PA_UNLOCK_COND(pa);
PMAP_UNLOCK(pmap);
return (m);
}
vm_paddr_t
pmap_kextract(vm_offset_t va)
{
pd_entry_t pde;
vm_paddr_t pa;
if (va >= DMAP_MIN_ADDRESS && va < DMAP_MAX_ADDRESS) {
pa = DMAP_TO_PHYS(va);
} else {
pde = *vtopde(va);
if (pde & PG_PS) {
pa = (pde & PG_PS_FRAME) | (va & PDRMASK);
} else {
/*
* Beware of a concurrent promotion that changes the
* PDE at this point! For example, vtopte() must not
* be used to access the PTE because it would use the
* new PDE. It is, however, safe to use the old PDE
* because the page table page is preserved by the
* promotion.
*/
pa = *pmap_pde_to_pte(&pde, va);
pa = (pa & PG_FRAME) | (va & PAGE_MASK);
}
}
return (pa);
}
/***************************************************
* Low level mapping routines.....
***************************************************/
/*
* Add a wired page to the kva.
* Note: not SMP coherent.
*/
PMAP_INLINE void
pmap_kenter(vm_offset_t va, vm_paddr_t pa)
{
pt_entry_t *pte;
pte = vtopte(va);
pte_store(pte, pa | PG_RW | PG_V | PG_G);
}
static __inline void
pmap_kenter_attr(vm_offset_t va, vm_paddr_t pa, int mode)
{
pt_entry_t *pte;
pte = vtopte(va);
pte_store(pte, pa | PG_RW | PG_V | PG_G | pmap_cache_bits(mode, 0));
}
/*
* Remove a page from the kernel pagetables.
* Note: not SMP coherent.
*/
PMAP_INLINE void
pmap_kremove(vm_offset_t va)
{
pt_entry_t *pte;
pte = vtopte(va);
pte_clear(pte);
}
/*
* Used to map a range of physical addresses into kernel
* virtual address space.
*
* The value passed in '*virt' is a suggested virtual address for
* the mapping. Architectures which can support a direct-mapped
* physical to virtual region can return the appropriate address
* within that region, leaving '*virt' unchanged. Other
* architectures should map the pages starting at '*virt' and
* update '*virt' with the first usable address after the mapped
* region.
*/
vm_offset_t
pmap_map(vm_offset_t *virt, vm_paddr_t start, vm_paddr_t end, int prot)
{
return PHYS_TO_DMAP(start);
}
/*
* Add a list of wired pages to the kva
* this routine is only used for temporary
* kernel mappings that do not need to have
* page modification or references recorded.
* Note that old mappings are simply written
* over. The page *must* be wired.
* Note: SMP coherent. Uses a ranged shootdown IPI.
*/
void
pmap_qenter(vm_offset_t sva, vm_page_t *ma, int count)
{
pt_entry_t *endpte, oldpte, pa, *pte;
vm_page_t m;
oldpte = 0;
pte = vtopte(sva);
endpte = pte + count;
while (pte < endpte) {
m = *ma++;
pa = VM_PAGE_TO_PHYS(m) | pmap_cache_bits(m->md.pat_mode, 0);
if ((*pte & (PG_FRAME | PG_PTE_CACHE)) != pa) {
oldpte |= *pte;
pte_store(pte, pa | PG_G | PG_RW | PG_V);
}
pte++;
}
if (__predict_false((oldpte & PG_V) != 0))
pmap_invalidate_range(kernel_pmap, sva, sva + count *
PAGE_SIZE);
}
/*
* This routine tears out page mappings from the
* kernel -- it is meant only for temporary mappings.
* Note: SMP coherent. Uses a ranged shootdown IPI.
*/
void
pmap_qremove(vm_offset_t sva, int count)
{
vm_offset_t va;
va = sva;
while (count-- > 0) {
pmap_kremove(va);
va += PAGE_SIZE;
}
pmap_invalidate_range(kernel_pmap, sva, va);
}
/***************************************************
* Page table page management routines.....
***************************************************/
static __inline void
pmap_free_zero_pages(vm_page_t free)
{
vm_page_t m;
while (free != NULL) {
m = free;
free = m->right;
/* Preserve the page's PG_ZERO setting. */
vm_page_free_toq(m);
}
}
/*
* Schedule the specified unused page table page to be freed. Specifically,
* add the page to the specified list of pages that will be released to the
* physical memory manager after the TLB has been updated.
*/
static __inline void
pmap_add_delayed_free_list(vm_page_t m, vm_page_t *free, boolean_t set_PG_ZERO)
{
if (set_PG_ZERO)
m->flags |= PG_ZERO;
else
m->flags &= ~PG_ZERO;
m->right = *free;
*free = m;
}
/*
* Inserts the specified page table page into the specified pmap's collection
* of idle page table pages. Each of a pmap's page table pages is responsible
* for mapping a distinct range of virtual addresses. The pmap's collection is
* ordered by this virtual address range.
*/
static void
pmap_insert_pt_page(pmap_t pmap, vm_page_t mpte)
{
vm_page_t root;
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
root = pmap->pm_root;
if (root == NULL) {
mpte->left = NULL;
mpte->right = NULL;
} else {
root = vm_page_splay(mpte->pindex, root);
if (mpte->pindex < root->pindex) {
mpte->left = root->left;
mpte->right = root;
root->left = NULL;
} else if (mpte->pindex == root->pindex)
panic("pmap_insert_pt_page: pindex already inserted");
else {
mpte->right = root->right;
mpte->left = root;
root->right = NULL;
}
}
pmap->pm_root = mpte;
}
/*
* Looks for a page table page mapping the specified virtual address in the
* specified pmap's collection of idle page table pages. Returns NULL if there
* is no page table page corresponding to the specified virtual address.
*/
static vm_page_t
pmap_lookup_pt_page(pmap_t pmap, vm_offset_t va)
{
vm_page_t mpte;
vm_pindex_t pindex = pmap_pde_pindex(va);
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
if ((mpte = pmap->pm_root) != NULL && mpte->pindex != pindex) {
mpte = vm_page_splay(pindex, mpte);
if ((pmap->pm_root = mpte)->pindex != pindex)
mpte = NULL;
}
return (mpte);
}
/*
* Removes the specified page table page from the specified pmap's collection
* of idle page table pages. The specified page table page must be a member of
* the pmap's collection.
*/
static void
pmap_remove_pt_page(pmap_t pmap, vm_page_t mpte)
{
vm_page_t root;
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
if (mpte != pmap->pm_root) {
root = vm_page_splay(mpte->pindex, pmap->pm_root);
KASSERT(mpte == root,
("pmap_remove_pt_page: mpte %p is missing from pmap %p",
mpte, pmap));
}
if (mpte->left == NULL)
root = mpte->right;
else {
root = vm_page_splay(mpte->pindex, mpte->left);
root->right = mpte->right;
}
pmap->pm_root = root;
}
/*
* This routine unholds page table pages, and if the hold count
* drops to zero, then it decrements the wire count.
*/
static __inline int
pmap_unwire_pte_hold(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_page_t *free)
{
--m->wire_count;
if (m->wire_count == 0)
return (_pmap_unwire_pte_hold(pmap, va, m, free));
else
return (0);
}
static int
_pmap_unwire_pte_hold(pmap_t pmap, vm_offset_t va, vm_page_t m,
vm_page_t *free)
{
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
/*
* unmap the page table page
*/
if (m->pindex >= (NUPDE + NUPDPE)) {
/* PDP page */
pml4_entry_t *pml4;
pml4 = pmap_pml4e(pmap, va);
*pml4 = 0;
} else if (m->pindex >= NUPDE) {
/* PD page */
pdp_entry_t *pdp;
pdp = pmap_pdpe(pmap, va);
*pdp = 0;
} else {
/* PTE page */
pd_entry_t *pd;
pd = pmap_pde(pmap, va);
*pd = 0;
}
pmap_resident_count_dec(pmap, 1);
if (m->pindex < NUPDE) {
/* We just released a PT, unhold the matching PD */
vm_page_t pdpg;
pdpg = PHYS_TO_VM_PAGE(*pmap_pdpe(pmap, va) & PG_FRAME);
pmap_unwire_pte_hold(pmap, va, pdpg, free);
}
if (m->pindex >= NUPDE && m->pindex < (NUPDE + NUPDPE)) {
/* We just released a PD, unhold the matching PDP */
vm_page_t pdppg;
pdppg = PHYS_TO_VM_PAGE(*pmap_pml4e(pmap, va) & PG_FRAME);
pmap_unwire_pte_hold(pmap, va, pdppg, free);
}
/*
* This is a release store so that the ordinary store unmapping
* the page table page is globally performed before TLB shoot-
* down is begun.
*/
atomic_subtract_rel_int(&cnt.v_wire_count, 1);
/*
* Put page on a list so that it is released after
* *ALL* TLB shootdown is done
*/
pmap_add_delayed_free_list(m, free, TRUE);
return (1);
}
/*
* After removing a page table entry, this routine is used to
* conditionally free the page, and manage the hold/wire counts.
*/
static int
pmap_unuse_pt(pmap_t pmap, vm_offset_t va, pd_entry_t ptepde, vm_page_t *free)
{
vm_page_t mpte;
if (va >= VM_MAXUSER_ADDRESS)
return (0);
KASSERT(ptepde != 0, ("pmap_unuse_pt: ptepde != 0"));
mpte = PHYS_TO_VM_PAGE(ptepde & PG_FRAME);
return (pmap_unwire_pte_hold(pmap, va, mpte, free));
}
void
pmap_pinit0(pmap_t pmap)
{
PMAP_LOCK_INIT(pmap);
pmap->pm_pml4 = (pml4_entry_t *)PHYS_TO_DMAP(KPML4phys);
pmap->pm_root = NULL;
CPU_ZERO(&pmap->pm_active);
PCPU_SET(curpmap, pmap);
TAILQ_INIT(&pmap->pm_pvchunk);
bzero(&pmap->pm_stats, sizeof pmap->pm_stats);
}
/*
* Initialize a preallocated and zeroed pmap structure,
* such as one in a vmspace structure.
*/
int
pmap_pinit(pmap_t pmap)
{
vm_page_t pml4pg;
int i;
PMAP_LOCK_INIT(pmap);
/*
* allocate the page directory page
*/
while ((pml4pg = vm_page_alloc(NULL, 0, VM_ALLOC_NORMAL |
VM_ALLOC_NOOBJ | VM_ALLOC_WIRED | VM_ALLOC_ZERO)) == NULL)
VM_WAIT;
pmap->pm_pml4 = (pml4_entry_t *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(pml4pg));
if ((pml4pg->flags & PG_ZERO) == 0)
pagezero(pmap->pm_pml4);
/* Wire in kernel global address entries. */
pmap->pm_pml4[KPML4I] = KPDPphys | PG_RW | PG_V | PG_U;
for (i = 0; i < NDMPML4E; i++) {
pmap->pm_pml4[DMPML4I + i] = (DMPDPphys + (i << PAGE_SHIFT)) |
PG_RW | PG_V | PG_U;
}
/* install self-referential address mapping entry(s) */
pmap->pm_pml4[PML4PML4I] = VM_PAGE_TO_PHYS(pml4pg) | PG_V | PG_RW | PG_A | PG_M;
pmap->pm_root = NULL;
CPU_ZERO(&pmap->pm_active);
TAILQ_INIT(&pmap->pm_pvchunk);
bzero(&pmap->pm_stats, sizeof pmap->pm_stats);
return (1);
}
/*
* this routine is called if the page table page is not
* mapped correctly.
*
* Note: If a page allocation fails at page table level two or three,
* one or two pages may be held during the wait, only to be released
* afterwards. This conservative approach is easily argued to avoid
* race conditions.
*/
static vm_page_t
_pmap_allocpte(pmap_t pmap, vm_pindex_t ptepindex, int flags)
{
vm_page_t m, pdppg, pdpg;
KASSERT((flags & (M_NOWAIT | M_WAITOK)) == M_NOWAIT ||
(flags & (M_NOWAIT | M_WAITOK)) == M_WAITOK,
("_pmap_allocpte: flags is neither M_NOWAIT nor M_WAITOK"));
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
/*
* Allocate a page table page.
*/
if ((m = vm_page_alloc(NULL, ptepindex, VM_ALLOC_NOOBJ |
VM_ALLOC_WIRED | VM_ALLOC_ZERO)) == NULL) {
if (flags & M_WAITOK) {
PMAP_UNLOCK(pmap);
rw_wunlock(&pvh_global_lock);
VM_WAIT;
rw_wlock(&pvh_global_lock);
PMAP_LOCK(pmap);
}
/*
* Indicate the need to retry. While waiting, the page table
* page may have been allocated.
*/
return (NULL);
}
if ((m->flags & PG_ZERO) == 0)
pmap_zero_page(m);
/*
* Map the pagetable page into the process address space, if
* it isn't already there.
*/
if (ptepindex >= (NUPDE + NUPDPE)) {
pml4_entry_t *pml4;
vm_pindex_t pml4index;
/* Wire up a new PDPE page */
pml4index = ptepindex - (NUPDE + NUPDPE);
pml4 = &pmap->pm_pml4[pml4index];
*pml4 = VM_PAGE_TO_PHYS(m) | PG_U | PG_RW | PG_V | PG_A | PG_M;
} else if (ptepindex >= NUPDE) {
vm_pindex_t pml4index;
vm_pindex_t pdpindex;
pml4_entry_t *pml4;
pdp_entry_t *pdp;
/* Wire up a new PDE page */
pdpindex = ptepindex - NUPDE;
pml4index = pdpindex >> NPML4EPGSHIFT;
pml4 = &pmap->pm_pml4[pml4index];
if ((*pml4 & PG_V) == 0) {
/* Have to allocate a new pdp, recurse */
if (_pmap_allocpte(pmap, NUPDE + NUPDPE + pml4index,
flags) == NULL) {
--m->wire_count;
atomic_subtract_int(&cnt.v_wire_count, 1);
vm_page_free_zero(m);
return (NULL);
}
} else {
/* Add reference to pdp page */
pdppg = PHYS_TO_VM_PAGE(*pml4 & PG_FRAME);
pdppg->wire_count++;
}
pdp = (pdp_entry_t *)PHYS_TO_DMAP(*pml4 & PG_FRAME);
/* Now find the pdp page */
pdp = &pdp[pdpindex & ((1ul << NPDPEPGSHIFT) - 1)];
*pdp = VM_PAGE_TO_PHYS(m) | PG_U | PG_RW | PG_V | PG_A | PG_M;
} else {
vm_pindex_t pml4index;
vm_pindex_t pdpindex;
pml4_entry_t *pml4;
pdp_entry_t *pdp;
pd_entry_t *pd;
/* Wire up a new PTE page */
pdpindex = ptepindex >> NPDPEPGSHIFT;
pml4index = pdpindex >> NPML4EPGSHIFT;
/* First, find the pdp and check that its valid. */
pml4 = &pmap->pm_pml4[pml4index];
if ((*pml4 & PG_V) == 0) {
/* Have to allocate a new pd, recurse */
if (_pmap_allocpte(pmap, NUPDE + pdpindex,
flags) == NULL) {
--m->wire_count;
atomic_subtract_int(&cnt.v_wire_count, 1);
vm_page_free_zero(m);
return (NULL);
}
pdp = (pdp_entry_t *)PHYS_TO_DMAP(*pml4 & PG_FRAME);
pdp = &pdp[pdpindex & ((1ul << NPDPEPGSHIFT) - 1)];
} else {
pdp = (pdp_entry_t *)PHYS_TO_DMAP(*pml4 & PG_FRAME);
pdp = &pdp[pdpindex & ((1ul << NPDPEPGSHIFT) - 1)];
if ((*pdp & PG_V) == 0) {
/* Have to allocate a new pd, recurse */
if (_pmap_allocpte(pmap, NUPDE + pdpindex,
flags) == NULL) {
--m->wire_count;
atomic_subtract_int(&cnt.v_wire_count,
1);
vm_page_free_zero(m);
return (NULL);
}
} else {
/* Add reference to the pd page */
pdpg = PHYS_TO_VM_PAGE(*pdp & PG_FRAME);
pdpg->wire_count++;
}
}
pd = (pd_entry_t *)PHYS_TO_DMAP(*pdp & PG_FRAME);
/* Now we know where the page directory page is */
pd = &pd[ptepindex & ((1ul << NPDEPGSHIFT) - 1)];
*pd = VM_PAGE_TO_PHYS(m) | PG_U | PG_RW | PG_V | PG_A | PG_M;
}
pmap_resident_count_inc(pmap, 1);
return (m);
}
static vm_page_t
pmap_allocpde(pmap_t pmap, vm_offset_t va, int flags)
{
vm_pindex_t pdpindex, ptepindex;
pdp_entry_t *pdpe;
vm_page_t pdpg;
KASSERT((flags & (M_NOWAIT | M_WAITOK)) == M_NOWAIT ||
(flags & (M_NOWAIT | M_WAITOK)) == M_WAITOK,
("pmap_allocpde: flags is neither M_NOWAIT nor M_WAITOK"));
retry:
pdpe = pmap_pdpe(pmap, va);
if (pdpe != NULL && (*pdpe & PG_V) != 0) {
/* Add a reference to the pd page. */
pdpg = PHYS_TO_VM_PAGE(*pdpe & PG_FRAME);
pdpg->wire_count++;
} else {
/* Allocate a pd page. */
ptepindex = pmap_pde_pindex(va);
pdpindex = ptepindex >> NPDPEPGSHIFT;
pdpg = _pmap_allocpte(pmap, NUPDE + pdpindex, flags);
if (pdpg == NULL && (flags & M_WAITOK))
goto retry;
}
return (pdpg);
}
static vm_page_t
pmap_allocpte(pmap_t pmap, vm_offset_t va, int flags)
{
vm_pindex_t ptepindex;
pd_entry_t *pd;
vm_page_t m;
KASSERT((flags & (M_NOWAIT | M_WAITOK)) == M_NOWAIT ||
(flags & (M_NOWAIT | M_WAITOK)) == M_WAITOK,
("pmap_allocpte: flags is neither M_NOWAIT nor M_WAITOK"));
/*
* Calculate pagetable page index
*/
ptepindex = pmap_pde_pindex(va);
retry:
/*
* Get the page directory entry
*/
pd = pmap_pde(pmap, va);
/*
* This supports switching from a 2MB page to a
* normal 4K page.
*/
if (pd != NULL && (*pd & (PG_PS | PG_V)) == (PG_PS | PG_V)) {
if (!pmap_demote_pde(pmap, pd, va)) {
/*
* Invalidation of the 2MB page mapping may have caused
* the deallocation of the underlying PD page.
*/
pd = NULL;
}
}
/*
* If the page table page is mapped, we just increment the
* hold count, and activate it.
*/
if (pd != NULL && (*pd & PG_V) != 0) {
m = PHYS_TO_VM_PAGE(*pd & PG_FRAME);
m->wire_count++;
} else {
/*
* Here if the pte page isn't mapped, or if it has been
* deallocated.
*/
m = _pmap_allocpte(pmap, ptepindex, flags);
if (m == NULL && (flags & M_WAITOK))
goto retry;
}
return (m);
}
/***************************************************
* Pmap allocation/deallocation routines.
***************************************************/
/*
* Release any resources held by the given physical map.
* Called when a pmap initialized by pmap_pinit is being released.
* Should only be called if the map contains no valid mappings.
*/
void
pmap_release(pmap_t pmap)
{
vm_page_t m;
int i;
KASSERT(pmap->pm_stats.resident_count == 0,
("pmap_release: pmap resident count %ld != 0",
pmap->pm_stats.resident_count));
KASSERT(pmap->pm_root == NULL,
("pmap_release: pmap has reserved page table page(s)"));
m = PHYS_TO_VM_PAGE(pmap->pm_pml4[PML4PML4I] & PG_FRAME);
pmap->pm_pml4[KPML4I] = 0; /* KVA */
for (i = 0; i < NDMPML4E; i++) /* Direct Map */
pmap->pm_pml4[DMPML4I + i] = 0;
pmap->pm_pml4[PML4PML4I] = 0; /* Recursive Mapping */
m->wire_count--;
atomic_subtract_int(&cnt.v_wire_count, 1);
vm_page_free_zero(m);
PMAP_LOCK_DESTROY(pmap);
}
static int
kvm_size(SYSCTL_HANDLER_ARGS)
{
unsigned long ksize = VM_MAX_KERNEL_ADDRESS - VM_MIN_KERNEL_ADDRESS;
return sysctl_handle_long(oidp, &ksize, 0, req);
}
SYSCTL_PROC(_vm, OID_AUTO, kvm_size, CTLTYPE_LONG|CTLFLAG_RD,
0, 0, kvm_size, "LU", "Size of KVM");
static int
kvm_free(SYSCTL_HANDLER_ARGS)
{
unsigned long kfree = VM_MAX_KERNEL_ADDRESS - kernel_vm_end;
return sysctl_handle_long(oidp, &kfree, 0, req);
}
SYSCTL_PROC(_vm, OID_AUTO, kvm_free, CTLTYPE_LONG|CTLFLAG_RD,
0, 0, kvm_free, "LU", "Amount of KVM free");
/*
* grow the number of kernel page table entries, if needed
*/
void
pmap_growkernel(vm_offset_t addr)
{
vm_paddr_t paddr;
vm_page_t nkpg;
pd_entry_t *pde, newpdir;
pdp_entry_t *pdpe;
mtx_assert(&kernel_map->system_mtx, MA_OWNED);
/*
* Return if "addr" is within the range of kernel page table pages
* that were preallocated during pmap bootstrap. Moreover, leave
* "kernel_vm_end" and the kernel page table as they were.
*
* The correctness of this action is based on the following
* argument: vm_map_findspace() allocates contiguous ranges of the
* kernel virtual address space. It calls this function if a range
* ends after "kernel_vm_end". If the kernel is mapped between
* "kernel_vm_end" and "addr", then the range cannot begin at
* "kernel_vm_end". In fact, its beginning address cannot be less
* than the kernel. Thus, there is no immediate need to allocate
* any new kernel page table pages between "kernel_vm_end" and
* "KERNBASE".
*/
if (KERNBASE < addr && addr <= KERNBASE + NKPT * NBPDR)
return;
addr = roundup2(addr, NBPDR);
if (addr - 1 >= kernel_map->max_offset)
addr = kernel_map->max_offset;
while (kernel_vm_end < addr) {
pdpe = pmap_pdpe(kernel_pmap, kernel_vm_end);
if ((*pdpe & PG_V) == 0) {
/* We need a new PDP entry */
nkpg = vm_page_alloc(NULL, kernel_vm_end >> PDPSHIFT,
VM_ALLOC_INTERRUPT | VM_ALLOC_NOOBJ |
VM_ALLOC_WIRED | VM_ALLOC_ZERO);
if (nkpg == NULL)
panic("pmap_growkernel: no memory to grow kernel");
if ((nkpg->flags & PG_ZERO) == 0)
pmap_zero_page(nkpg);
paddr = VM_PAGE_TO_PHYS(nkpg);
*pdpe = (pdp_entry_t)
(paddr | PG_V | PG_RW | PG_A | PG_M);
continue; /* try again */
}
pde = pmap_pdpe_to_pde(pdpe, kernel_vm_end);
if ((*pde & PG_V) != 0) {
kernel_vm_end = (kernel_vm_end + NBPDR) & ~PDRMASK;
if (kernel_vm_end - 1 >= kernel_map->max_offset) {
kernel_vm_end = kernel_map->max_offset;
break;
}
continue;
}
nkpg = vm_page_alloc(NULL, pmap_pde_pindex(kernel_vm_end),
VM_ALLOC_INTERRUPT | VM_ALLOC_NOOBJ | VM_ALLOC_WIRED |
VM_ALLOC_ZERO);
if (nkpg == NULL)
panic("pmap_growkernel: no memory to grow kernel");
if ((nkpg->flags & PG_ZERO) == 0)
pmap_zero_page(nkpg);
paddr = VM_PAGE_TO_PHYS(nkpg);
newpdir = (pd_entry_t) (paddr | PG_V | PG_RW | PG_A | PG_M);
pde_store(pde, newpdir);
kernel_vm_end = (kernel_vm_end + NBPDR) & ~PDRMASK;
if (kernel_vm_end - 1 >= kernel_map->max_offset) {
kernel_vm_end = kernel_map->max_offset;
break;
}
}
}
/***************************************************
* page management routines.
***************************************************/
CTASSERT(sizeof(struct pv_chunk) == PAGE_SIZE);
CTASSERT(_NPCM == 3);
CTASSERT(_NPCPV == 168);
static __inline struct pv_chunk *
pv_to_chunk(pv_entry_t pv)
{
return ((struct pv_chunk *)((uintptr_t)pv & ~(uintptr_t)PAGE_MASK));
}
#define PV_PMAP(pv) (pv_to_chunk(pv)->pc_pmap)
#define PC_FREE0 0xfffffffffffffffful
#define PC_FREE1 0xfffffffffffffffful
#define PC_FREE2 0x000000fffffffffful
static const uint64_t pc_freemask[_NPCM] = { PC_FREE0, PC_FREE1, PC_FREE2 };
SYSCTL_LONG(_vm_pmap, OID_AUTO, pv_entry_count, CTLFLAG_RD, &pv_entry_count, 0,
"Current number of pv entries");
#ifdef PV_STATS
static int pc_chunk_count, pc_chunk_allocs, pc_chunk_frees, pc_chunk_tryfail;
SYSCTL_INT(_vm_pmap, OID_AUTO, pc_chunk_count, CTLFLAG_RD, &pc_chunk_count, 0,
"Current number of pv entry chunks");
SYSCTL_INT(_vm_pmap, OID_AUTO, pc_chunk_allocs, CTLFLAG_RD, &pc_chunk_allocs, 0,
"Current number of pv entry chunks allocated");
SYSCTL_INT(_vm_pmap, OID_AUTO, pc_chunk_frees, CTLFLAG_RD, &pc_chunk_frees, 0,
"Current number of pv entry chunks frees");
SYSCTL_INT(_vm_pmap, OID_AUTO, pc_chunk_tryfail, CTLFLAG_RD, &pc_chunk_tryfail, 0,
"Number of times tried to get a chunk page but failed.");
static long pv_entry_frees, pv_entry_allocs;
static int pv_entry_spare;
SYSCTL_LONG(_vm_pmap, OID_AUTO, pv_entry_frees, CTLFLAG_RD, &pv_entry_frees, 0,
"Current number of pv entry frees");
SYSCTL_LONG(_vm_pmap, OID_AUTO, pv_entry_allocs, CTLFLAG_RD, &pv_entry_allocs, 0,
"Current number of pv entry allocs");
SYSCTL_INT(_vm_pmap, OID_AUTO, pv_entry_spare, CTLFLAG_RD, &pv_entry_spare, 0,
"Current number of spare pv entries");
#endif
/*
* We are in a serious low memory condition. Resort to
* drastic measures to free some pages so we can allocate
* another pv entry chunk.
*
* We do not, however, unmap 2mpages because subsequent accesses will
* allocate per-page pv entries until repromotion occurs, thereby
* exacerbating the shortage of free pv entries.
*/
static vm_page_t
pmap_pv_reclaim(pmap_t locked_pmap)
{
struct pch newtail;
struct pv_chunk *pc;
struct md_page *pvh;
pd_entry_t *pde;
pmap_t pmap;
pt_entry_t *pte, tpte;
pv_entry_t pv;
vm_offset_t va;
vm_page_t free, m, m_pc;
uint64_t inuse;
int bit, field, freed;
rw_assert(&pvh_global_lock, RA_WLOCKED);
PMAP_LOCK_ASSERT(locked_pmap, MA_OWNED);
pmap = NULL;
free = m_pc = NULL;
TAILQ_INIT(&newtail);
while ((pc = TAILQ_FIRST(&pv_chunks)) != NULL && free == NULL) {
TAILQ_REMOVE(&pv_chunks, pc, pc_lru);
if (pmap != pc->pc_pmap) {
if (pmap != NULL) {
pmap_invalidate_all(pmap);
if (pmap != locked_pmap)
PMAP_UNLOCK(pmap);
}
pmap = pc->pc_pmap;
/* Avoid deadlock and lock recursion. */
if (pmap > locked_pmap)
PMAP_LOCK(pmap);
else if (pmap != locked_pmap && !PMAP_TRYLOCK(pmap)) {
pmap = NULL;
TAILQ_INSERT_TAIL(&newtail, pc, pc_lru);
continue;
}
}
/*
* Destroy every non-wired, 4 KB page mapping in the chunk.
*/
freed = 0;
for (field = 0; field < _NPCM; field++) {
for (inuse = ~pc->pc_map[field] & pc_freemask[field];
inuse != 0; inuse &= ~(1UL << bit)) {
bit = bsfq(inuse);
pv = &pc->pc_pventry[field * 64 + bit];
va = pv->pv_va;
pde = pmap_pde(pmap, va);
if ((*pde & PG_PS) != 0)
continue;
pte = pmap_pde_to_pte(pde, va);
if ((*pte & PG_W) != 0)
continue;
tpte = pte_load_clear(pte);
if ((tpte & PG_G) != 0)
pmap_invalidate_page(pmap, va);
m = PHYS_TO_VM_PAGE(tpte & PG_FRAME);
if ((tpte & (PG_M | PG_RW)) == (PG_M | PG_RW))
vm_page_dirty(m);
if ((tpte & PG_A) != 0)
vm_page_aflag_set(m, PGA_REFERENCED);
TAILQ_REMOVE(&m->md.pv_list, pv, pv_list);
if (TAILQ_EMPTY(&m->md.pv_list) &&
(m->flags & PG_FICTITIOUS) == 0) {
pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m));
if (TAILQ_EMPTY(&pvh->pv_list)) {
vm_page_aflag_clear(m,
PGA_WRITEABLE);
}
}
pc->pc_map[field] |= 1UL << bit;
pmap_unuse_pt(pmap, va, *pde, &free);
freed++;
}
}
if (freed == 0) {
TAILQ_INSERT_TAIL(&newtail, pc, pc_lru);
continue;
}
/* Every freed mapping is for a 4 KB page. */
pmap_resident_count_dec(pmap, freed);
PV_STAT(pv_entry_frees += freed);
PV_STAT(pv_entry_spare += freed);
pv_entry_count -= freed;
TAILQ_REMOVE(&pmap->pm_pvchunk, pc, pc_list);
if (pc->pc_map[0] == PC_FREE0 && pc->pc_map[1] == PC_FREE1 &&
pc->pc_map[2] == PC_FREE2) {
PV_STAT(pv_entry_spare -= _NPCPV);
PV_STAT(pc_chunk_count--);
PV_STAT(pc_chunk_frees++);
/* Entire chunk is free; return it. */
m_pc = PHYS_TO_VM_PAGE(DMAP_TO_PHYS((vm_offset_t)pc));
dump_drop_page(m_pc->phys_addr);
break;
}
TAILQ_INSERT_HEAD(&pmap->pm_pvchunk, pc, pc_list);
TAILQ_INSERT_TAIL(&newtail, pc, pc_lru);
/* One freed pv entry in locked_pmap is sufficient. */
if (pmap == locked_pmap)
break;
}
TAILQ_CONCAT(&pv_chunks, &newtail, pc_lru);
if (pmap != NULL) {
pmap_invalidate_all(pmap);
if (pmap != locked_pmap)
PMAP_UNLOCK(pmap);
}
if (m_pc == NULL && free != NULL) {
m_pc = free;
free = m_pc->right;
/* Recycle a freed page table page. */
m_pc->wire_count = 1;
atomic_add_int(&cnt.v_wire_count, 1);
}
pmap_free_zero_pages(free);
return (m_pc);
}
/*
* free the pv_entry back to the free list
*/
static void
free_pv_entry(pmap_t pmap, pv_entry_t pv)
{
struct pv_chunk *pc;
int idx, field, bit;
rw_assert(&pvh_global_lock, RA_WLOCKED);
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
PV_STAT(pv_entry_frees++);
PV_STAT(pv_entry_spare++);
pv_entry_count--;
pc = pv_to_chunk(pv);
idx = pv - &pc->pc_pventry[0];
field = idx / 64;
bit = idx % 64;
pc->pc_map[field] |= 1ul << bit;
if (pc->pc_map[0] != PC_FREE0 || pc->pc_map[1] != PC_FREE1 ||
pc->pc_map[2] != PC_FREE2) {
/* 98% of the time, pc is already at the head of the list. */
if (__predict_false(pc != TAILQ_FIRST(&pmap->pm_pvchunk))) {
TAILQ_REMOVE(&pmap->pm_pvchunk, pc, pc_list);
TAILQ_INSERT_HEAD(&pmap->pm_pvchunk, pc, pc_list);
}
return;
}
TAILQ_REMOVE(&pmap->pm_pvchunk, pc, pc_list);
free_pv_chunk(pc);
}
static void
free_pv_chunk(struct pv_chunk *pc)
{
vm_page_t m;
TAILQ_REMOVE(&pv_chunks, pc, pc_lru);
PV_STAT(pv_entry_spare -= _NPCPV);
PV_STAT(pc_chunk_count--);
PV_STAT(pc_chunk_frees++);
/* entire chunk is free, return it */
m = PHYS_TO_VM_PAGE(DMAP_TO_PHYS((vm_offset_t)pc));
dump_drop_page(m->phys_addr);
vm_page_unwire(m, 0);
vm_page_free(m);
}
/*
* get a new pv_entry, allocating a block from the system
* when needed.
*/
static pv_entry_t
get_pv_entry(pmap_t pmap, boolean_t try)
{
int bit, field;
pv_entry_t pv;
struct pv_chunk *pc;
vm_page_t m;
rw_assert(&pvh_global_lock, RA_WLOCKED);
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
PV_STAT(pv_entry_allocs++);
retry:
pc = TAILQ_FIRST(&pmap->pm_pvchunk);
if (pc != NULL) {
for (field = 0; field < _NPCM; field++) {
if (pc->pc_map[field]) {
bit = bsfq(pc->pc_map[field]);
break;
}
}
if (field < _NPCM) {
pv = &pc->pc_pventry[field * 64 + bit];
pc->pc_map[field] &= ~(1ul << bit);
/* If this was the last item, move it to tail */
if (pc->pc_map[0] == 0 && pc->pc_map[1] == 0 &&
pc->pc_map[2] == 0) {
TAILQ_REMOVE(&pmap->pm_pvchunk, pc, pc_list);
TAILQ_INSERT_TAIL(&pmap->pm_pvchunk, pc,
pc_list);
}
pv_entry_count++;
PV_STAT(pv_entry_spare--);
return (pv);
}
}
/* No free items, allocate another chunk */
m = vm_page_alloc(NULL, 0, VM_ALLOC_NORMAL | VM_ALLOC_NOOBJ |
VM_ALLOC_WIRED);
if (m == NULL) {
if (try) {
PV_STAT(pc_chunk_tryfail++);
return (NULL);
}
m = pmap_pv_reclaim(pmap);
if (m == NULL)
goto retry;
}
PV_STAT(pc_chunk_count++);
PV_STAT(pc_chunk_allocs++);
dump_add_page(m->phys_addr);
pc = (void *)PHYS_TO_DMAP(m->phys_addr);
pc->pc_pmap = pmap;
pc->pc_map[0] = PC_FREE0 & ~1ul; /* preallocated bit 0 */
pc->pc_map[1] = PC_FREE1;
pc->pc_map[2] = PC_FREE2;
TAILQ_INSERT_TAIL(&pv_chunks, pc, pc_lru);
pv = &pc->pc_pventry[0];
TAILQ_INSERT_HEAD(&pmap->pm_pvchunk, pc, pc_list);
pv_entry_count++;
PV_STAT(pv_entry_spare += _NPCPV - 1);
return (pv);
}
/*
* First find and then remove the pv entry for the specified pmap and virtual
* address from the specified pv list. Returns the pv entry if found and NULL
* otherwise. This operation can be performed on pv lists for either 4KB or
* 2MB page mappings.
*/
static __inline pv_entry_t
pmap_pvh_remove(struct md_page *pvh, pmap_t pmap, vm_offset_t va)
{
pv_entry_t pv;
rw_assert(&pvh_global_lock, RA_WLOCKED);
TAILQ_FOREACH(pv, &pvh->pv_list, pv_list) {
if (pmap == PV_PMAP(pv) && va == pv->pv_va) {
TAILQ_REMOVE(&pvh->pv_list, pv, pv_list);
break;
}
}
return (pv);
}
/*
* After demotion from a 2MB page mapping to 512 4KB page mappings,
* destroy the pv entry for the 2MB page mapping and reinstantiate the pv
* entries for each of the 4KB page mappings.
*/
static void
pmap_pv_demote_pde(pmap_t pmap, vm_offset_t va, vm_paddr_t pa)
{
struct md_page *pvh;
pv_entry_t pv;
vm_offset_t va_last;
vm_page_t m;
rw_assert(&pvh_global_lock, RA_WLOCKED);
KASSERT((pa & PDRMASK) == 0,
("pmap_pv_demote_pde: pa is not 2mpage aligned"));
/*
* Transfer the 2mpage's pv entry for this mapping to the first
* page's pv list.
*/
pvh = pa_to_pvh(pa);
va = trunc_2mpage(va);
pv = pmap_pvh_remove(pvh, pmap, va);
KASSERT(pv != NULL, ("pmap_pv_demote_pde: pv not found"));
m = PHYS_TO_VM_PAGE(pa);
TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list);
/* Instantiate the remaining NPTEPG - 1 pv entries. */
va_last = va + NBPDR - PAGE_SIZE;
do {
m++;
KASSERT((m->oflags & VPO_UNMANAGED) == 0,
("pmap_pv_demote_pde: page %p is not managed", m));
va += PAGE_SIZE;
pmap_insert_entry(pmap, va, m);
} while (va < va_last);
}
/*
* After promotion from 512 4KB page mappings to a single 2MB page mapping,
* replace the many pv entries for the 4KB page mappings by a single pv entry
* for the 2MB page mapping.
*/
static void
pmap_pv_promote_pde(pmap_t pmap, vm_offset_t va, vm_paddr_t pa)
{
struct md_page *pvh;
pv_entry_t pv;
vm_offset_t va_last;
vm_page_t m;
rw_assert(&pvh_global_lock, RA_WLOCKED);
KASSERT((pa & PDRMASK) == 0,
("pmap_pv_promote_pde: pa is not 2mpage aligned"));
/*
* Transfer the first page's pv entry for this mapping to the
* 2mpage's pv list. Aside from avoiding the cost of a call
* to get_pv_entry(), a transfer avoids the possibility that
* get_pv_entry() calls pmap_collect() and that pmap_collect()
* removes one of the mappings that is being promoted.
*/
m = PHYS_TO_VM_PAGE(pa);
va = trunc_2mpage(va);
pv = pmap_pvh_remove(&m->md, pmap, va);
KASSERT(pv != NULL, ("pmap_pv_promote_pde: pv not found"));
pvh = pa_to_pvh(pa);
TAILQ_INSERT_TAIL(&pvh->pv_list, pv, pv_list);
/* Free the remaining NPTEPG - 1 pv entries. */
va_last = va + NBPDR - PAGE_SIZE;
do {
m++;
va += PAGE_SIZE;
pmap_pvh_free(&m->md, pmap, va);
} while (va < va_last);
}
/*
* First find and then destroy the pv entry for the specified pmap and virtual
* address. This operation can be performed on pv lists for either 4KB or 2MB
* page mappings.
*/
static void
pmap_pvh_free(struct md_page *pvh, pmap_t pmap, vm_offset_t va)
{
pv_entry_t pv;
pv = pmap_pvh_remove(pvh, pmap, va);
KASSERT(pv != NULL, ("pmap_pvh_free: pv not found"));
free_pv_entry(pmap, pv);
}
static void
pmap_remove_entry(pmap_t pmap, vm_page_t m, vm_offset_t va)
{
struct md_page *pvh;
rw_assert(&pvh_global_lock, RA_WLOCKED);
pmap_pvh_free(&m->md, pmap, va);
if (TAILQ_EMPTY(&m->md.pv_list) && (m->flags & PG_FICTITIOUS) == 0) {
pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m));
if (TAILQ_EMPTY(&pvh->pv_list))
vm_page_aflag_clear(m, PGA_WRITEABLE);
}
}
/*
* Create a pv entry for page at pa for
* (pmap, va).
*/
static void
pmap_insert_entry(pmap_t pmap, vm_offset_t va, vm_page_t m)
{
pv_entry_t pv;
rw_assert(&pvh_global_lock, RA_WLOCKED);
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
pv = get_pv_entry(pmap, FALSE);
pv->pv_va = va;
TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list);
}
/*
* Conditionally create a pv entry.
*/
static boolean_t
pmap_try_insert_pv_entry(pmap_t pmap, vm_offset_t va, vm_page_t m)
{
pv_entry_t pv;
rw_assert(&pvh_global_lock, RA_WLOCKED);
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
if ((pv = get_pv_entry(pmap, TRUE)) != NULL) {
pv->pv_va = va;
TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list);
return (TRUE);
} else
return (FALSE);
}
/*
* Create the pv entry for a 2MB page mapping.
*/
static boolean_t
pmap_pv_insert_pde(pmap_t pmap, vm_offset_t va, vm_paddr_t pa)
{
struct md_page *pvh;
pv_entry_t pv;
rw_assert(&pvh_global_lock, RA_WLOCKED);
if ((pv = get_pv_entry(pmap, TRUE)) != NULL) {
pv->pv_va = va;
pvh = pa_to_pvh(pa);
TAILQ_INSERT_TAIL(&pvh->pv_list, pv, pv_list);
return (TRUE);
} else
return (FALSE);
}
/*
* Fills a page table page with mappings to consecutive physical pages.
*/
static void
pmap_fill_ptp(pt_entry_t *firstpte, pt_entry_t newpte)
{
pt_entry_t *pte;
for (pte = firstpte; pte < firstpte + NPTEPG; pte++) {
*pte = newpte;
newpte += PAGE_SIZE;
}
}
/*
* Tries to demote a 2MB page mapping. If demotion fails, the 2MB page
* mapping is invalidated.
*/
static boolean_t
pmap_demote_pde(pmap_t pmap, pd_entry_t *pde, vm_offset_t va)
{
pd_entry_t newpde, oldpde;
pt_entry_t *firstpte, newpte;
vm_paddr_t mptepa;
vm_page_t free, mpte;
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
oldpde = *pde;
KASSERT((oldpde & (PG_PS | PG_V)) == (PG_PS | PG_V),
("pmap_demote_pde: oldpde is missing PG_PS and/or PG_V"));
mpte = pmap_lookup_pt_page(pmap, va);
if (mpte != NULL)
pmap_remove_pt_page(pmap, mpte);
else {
KASSERT((oldpde & PG_W) == 0,
("pmap_demote_pde: page table page for a wired mapping"
" is missing"));
/*
* Invalidate the 2MB page mapping and return "failure" if the
* mapping was never accessed or the allocation of the new
* page table page fails. If the 2MB page mapping belongs to
* the direct map region of the kernel's address space, then
* the page allocation request specifies the highest possible
* priority (VM_ALLOC_INTERRUPT). Otherwise, the priority is
* normal. Page table pages are preallocated for every other
* part of the kernel address space, so the direct map region
* is the only part of the kernel address space that must be
* handled here.
*/
if ((oldpde & PG_A) == 0 || (mpte = vm_page_alloc(NULL,
pmap_pde_pindex(va), (va >= DMAP_MIN_ADDRESS && va <
DMAP_MAX_ADDRESS ? VM_ALLOC_INTERRUPT : VM_ALLOC_NORMAL) |
VM_ALLOC_NOOBJ | VM_ALLOC_WIRED)) == NULL) {
free = NULL;
pmap_remove_pde(pmap, pde, trunc_2mpage(va), &free);
pmap_invalidate_page(pmap, trunc_2mpage(va));
pmap_free_zero_pages(free);
CTR2(KTR_PMAP, "pmap_demote_pde: failure for va %#lx"
" in pmap %p", va, pmap);
return (FALSE);
}
if (va < VM_MAXUSER_ADDRESS)
pmap_resident_count_inc(pmap, 1);
}
mptepa = VM_PAGE_TO_PHYS(mpte);
firstpte = (pt_entry_t *)PHYS_TO_DMAP(mptepa);
newpde = mptepa | PG_M | PG_A | (oldpde & PG_U) | PG_RW | PG_V;
KASSERT((oldpde & PG_A) != 0,
("pmap_demote_pde: oldpde is missing PG_A"));
KASSERT((oldpde & (PG_M | PG_RW)) != PG_RW,
("pmap_demote_pde: oldpde is missing PG_M"));
newpte = oldpde & ~PG_PS;
if ((newpte & PG_PDE_PAT) != 0)
newpte ^= PG_PDE_PAT | PG_PTE_PAT;
/*
* If the page table page is new, initialize it.
*/
if (mpte->wire_count == 1) {
mpte->wire_count = NPTEPG;
pmap_fill_ptp(firstpte, newpte);
}
KASSERT((*firstpte & PG_FRAME) == (newpte & PG_FRAME),
("pmap_demote_pde: firstpte and newpte map different physical"
" addresses"));
/*
* If the mapping has changed attributes, update the page table
* entries.
*/
if ((*firstpte & PG_PTE_PROMOTE) != (newpte & PG_PTE_PROMOTE))
pmap_fill_ptp(firstpte, newpte);
/*
* Demote the mapping. This pmap is locked. The old PDE has
* PG_A set. If the old PDE has PG_RW set, it also has PG_M
* set. Thus, there is no danger of a race with another
* processor changing the setting of PG_A and/or PG_M between
* the read above and the store below.
*/
if (workaround_erratum383)
pmap_update_pde(pmap, va, pde, newpde);
else
pde_store(pde, newpde);
/*
* Invalidate a stale recursive mapping of the page table page.
*/
if (va >= VM_MAXUSER_ADDRESS)
pmap_invalidate_page(pmap, (vm_offset_t)vtopte(va));
/*
* Demote the pv entry. This depends on the earlier demotion
* of the mapping. Specifically, the (re)creation of a per-
* page pv entry might trigger the execution of pmap_collect(),
* which might reclaim a newly (re)created per-page pv entry
* and destroy the associated mapping. In order to destroy
* the mapping, the PDE must have already changed from mapping
* the 2mpage to referencing the page table page.
*/
if ((oldpde & PG_MANAGED) != 0)
pmap_pv_demote_pde(pmap, va, oldpde & PG_PS_FRAME);
pmap_pde_demotions++;
CTR2(KTR_PMAP, "pmap_demote_pde: success for va %#lx"
" in pmap %p", va, pmap);
return (TRUE);
}
/*
* pmap_remove_pde: do the things to unmap a superpage in a process
*/
static int
pmap_remove_pde(pmap_t pmap, pd_entry_t *pdq, vm_offset_t sva,
vm_page_t *free)
{
struct md_page *pvh;
pd_entry_t oldpde;
vm_offset_t eva, va;
vm_page_t m, mpte;
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
KASSERT((sva & PDRMASK) == 0,
("pmap_remove_pde: sva is not 2mpage aligned"));
oldpde = pte_load_clear(pdq);
if (oldpde & PG_W)
pmap->pm_stats.wired_count -= NBPDR / PAGE_SIZE;
/*
* Machines that don't support invlpg, also don't support
* PG_G.
*/
if (oldpde & PG_G)
pmap_invalidate_page(kernel_pmap, sva);
pmap_resident_count_dec(pmap, NBPDR / PAGE_SIZE);
if (oldpde & PG_MANAGED) {
pvh = pa_to_pvh(oldpde & PG_PS_FRAME);
pmap_pvh_free(pvh, pmap, sva);
eva = sva + NBPDR;
for (va = sva, m = PHYS_TO_VM_PAGE(oldpde & PG_PS_FRAME);
va < eva; va += PAGE_SIZE, m++) {
if ((oldpde & (PG_M | PG_RW)) == (PG_M | PG_RW))
vm_page_dirty(m);
if (oldpde & PG_A)
vm_page_aflag_set(m, PGA_REFERENCED);
if (TAILQ_EMPTY(&m->md.pv_list) &&
TAILQ_EMPTY(&pvh->pv_list))
vm_page_aflag_clear(m, PGA_WRITEABLE);
}
}
if (pmap == kernel_pmap) {
if (!pmap_demote_pde(pmap, pdq, sva))
panic("pmap_remove_pde: failed demotion");
} else {
mpte = pmap_lookup_pt_page(pmap, sva);
if (mpte != NULL) {
pmap_remove_pt_page(pmap, mpte);
pmap_resident_count_dec(pmap, 1);
KASSERT(mpte->wire_count == NPTEPG,
("pmap_remove_pde: pte page wire count error"));
mpte->wire_count = 0;
pmap_add_delayed_free_list(mpte, free, FALSE);
atomic_subtract_int(&cnt.v_wire_count, 1);
}
}
return (pmap_unuse_pt(pmap, sva, *pmap_pdpe(pmap, sva), free));
}
/*
* pmap_remove_pte: do the things to unmap a page in a process
*/
static int
pmap_remove_pte(pmap_t pmap, pt_entry_t *ptq, vm_offset_t va,
pd_entry_t ptepde, vm_page_t *free)
{
pt_entry_t oldpte;
vm_page_t m;
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
oldpte = pte_load_clear(ptq);
if (oldpte & PG_W)
pmap->pm_stats.wired_count -= 1;
pmap_resident_count_dec(pmap, 1);
if (oldpte & PG_MANAGED) {
m = PHYS_TO_VM_PAGE(oldpte & PG_FRAME);
if ((oldpte & (PG_M | PG_RW)) == (PG_M | PG_RW))
vm_page_dirty(m);
if (oldpte & PG_A)
vm_page_aflag_set(m, PGA_REFERENCED);
pmap_remove_entry(pmap, m, va);
}
return (pmap_unuse_pt(pmap, va, ptepde, free));
}
/*
* Remove a single page from a process address space
*/
static void
pmap_remove_page(pmap_t pmap, vm_offset_t va, pd_entry_t *pde, vm_page_t *free)
{
pt_entry_t *pte;
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
if ((*pde & PG_V) == 0)
return;
pte = pmap_pde_to_pte(pde, va);
if ((*pte & PG_V) == 0)
return;
pmap_remove_pte(pmap, pte, va, *pde, free);
pmap_invalidate_page(pmap, va);
}
/*
* Remove the given range of addresses from the specified map.
*
* It is assumed that the start and end are properly
* rounded to the page size.
*/
void
pmap_remove(pmap_t pmap, vm_offset_t sva, vm_offset_t eva)
{
vm_offset_t va, va_next;
pml4_entry_t *pml4e;
pdp_entry_t *pdpe;
pd_entry_t ptpaddr, *pde;
pt_entry_t *pte;
vm_page_t free = NULL;
int anyvalid;
/*
* Perform an unsynchronized read. This is, however, safe.
*/
if (pmap->pm_stats.resident_count == 0)
return;
anyvalid = 0;
rw_wlock(&pvh_global_lock);
PMAP_LOCK(pmap);
/*
* special handling of removing one page. a very
* common operation and easy to short circuit some
* code.
*/
if (sva + PAGE_SIZE == eva) {
pde = pmap_pde(pmap, sva);
if (pde && (*pde & PG_PS) == 0) {
pmap_remove_page(pmap, sva, pde, &free);
goto out;
}
}
for (; sva < eva; sva = va_next) {
if (pmap->pm_stats.resident_count == 0)
break;
pml4e = pmap_pml4e(pmap, sva);
if ((*pml4e & PG_V) == 0) {
va_next = (sva + NBPML4) & ~PML4MASK;
if (va_next < sva)
va_next = eva;
continue;
}
pdpe = pmap_pml4e_to_pdpe(pml4e, sva);
if ((*pdpe & PG_V) == 0) {
va_next = (sva + NBPDP) & ~PDPMASK;
if (va_next < sva)
va_next = eva;
continue;
}
/*
* Calculate index for next page table.
*/
va_next = (sva + NBPDR) & ~PDRMASK;
if (va_next < sva)
va_next = eva;
pde = pmap_pdpe_to_pde(pdpe, sva);
ptpaddr = *pde;
/*
* Weed out invalid mappings.
*/
if (ptpaddr == 0)
continue;
/*
* Check for large page.
*/
if ((ptpaddr & PG_PS) != 0) {
/*
* Are we removing the entire large page? If not,
* demote the mapping and fall through.
*/
if (sva + NBPDR == va_next && eva >= va_next) {
/*
* The TLB entry for a PG_G mapping is
* invalidated by pmap_remove_pde().
*/
if ((ptpaddr & PG_G) == 0)
anyvalid = 1;
pmap_remove_pde(pmap, pde, sva, &free);
continue;
} else if (!pmap_demote_pde(pmap, pde, sva)) {
/* The large page mapping was destroyed. */
continue;
} else
ptpaddr = *pde;
}
/*
* Limit our scan to either the end of the va represented
* by the current page table page, or to the end of the
* range being removed.
*/
if (va_next > eva)
va_next = eva;
va = va_next;
for (pte = pmap_pde_to_pte(pde, sva); sva != va_next; pte++,
sva += PAGE_SIZE) {
if (*pte == 0) {
if (va != va_next) {
pmap_invalidate_range(pmap, va, sva);
va = va_next;
}
continue;
}
if ((*pte & PG_G) == 0)
anyvalid = 1;
else if (va == va_next)
va = sva;
if (pmap_remove_pte(pmap, pte, sva, ptpaddr, &free)) {
sva += PAGE_SIZE;
break;
}
}
if (va != va_next)
pmap_invalidate_range(pmap, va, sva);
}
out:
if (anyvalid)
pmap_invalidate_all(pmap);
rw_wunlock(&pvh_global_lock);
PMAP_UNLOCK(pmap);
pmap_free_zero_pages(free);
}
/*
* Routine: pmap_remove_all
* Function:
* Removes this physical page from
* all physical maps in which it resides.
* Reflects back modify bits to the pager.
*
* Notes:
* Original versions of this routine were very
* inefficient because they iteratively called
* pmap_remove (slow...)
*/
void
pmap_remove_all(vm_page_t m)
{
struct md_page *pvh;
pv_entry_t pv;
pmap_t pmap;
pt_entry_t *pte, tpte;
pd_entry_t *pde;
vm_offset_t va;
vm_page_t free;
KASSERT((m->oflags & VPO_UNMANAGED) == 0,
("pmap_remove_all: page %p is not managed", m));
free = NULL;
rw_wlock(&pvh_global_lock);
if ((m->flags & PG_FICTITIOUS) != 0)
goto small_mappings;
pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m));
while ((pv = TAILQ_FIRST(&pvh->pv_list)) != NULL) {
pmap = PV_PMAP(pv);
PMAP_LOCK(pmap);
va = pv->pv_va;
pde = pmap_pde(pmap, va);
(void)pmap_demote_pde(pmap, pde, va);
PMAP_UNLOCK(pmap);
}
small_mappings:
while ((pv = TAILQ_FIRST(&m->md.pv_list)) != NULL) {
pmap = PV_PMAP(pv);
PMAP_LOCK(pmap);
pmap_resident_count_dec(pmap, 1);
pde = pmap_pde(pmap, pv->pv_va);
KASSERT((*pde & PG_PS) == 0, ("pmap_remove_all: found"
" a 2mpage in page %p's pv list", m));
pte = pmap_pde_to_pte(pde, pv->pv_va);
tpte = pte_load_clear(pte);
if (tpte & PG_W)
pmap->pm_stats.wired_count--;
if (tpte & PG_A)
vm_page_aflag_set(m, PGA_REFERENCED);
/*
* Update the vm_page_t clean and reference bits.
*/
if ((tpte & (PG_M | PG_RW)) == (PG_M | PG_RW))
vm_page_dirty(m);
pmap_unuse_pt(pmap, pv->pv_va, *pde, &free);
pmap_invalidate_page(pmap, pv->pv_va);
TAILQ_REMOVE(&m->md.pv_list, pv, pv_list);
free_pv_entry(pmap, pv);
PMAP_UNLOCK(pmap);
}
vm_page_aflag_clear(m, PGA_WRITEABLE);
rw_wunlock(&pvh_global_lock);
pmap_free_zero_pages(free);
}
/*
* pmap_protect_pde: do the things to protect a 2mpage in a process
*/
static boolean_t
pmap_protect_pde(pmap_t pmap, pd_entry_t *pde, vm_offset_t sva, vm_prot_t prot)
{
pd_entry_t newpde, oldpde;
vm_offset_t eva, va;
vm_page_t m;
boolean_t anychanged;
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
KASSERT((sva & PDRMASK) == 0,
("pmap_protect_pde: sva is not 2mpage aligned"));
anychanged = FALSE;
retry:
oldpde = newpde = *pde;
if (oldpde & PG_MANAGED) {
eva = sva + NBPDR;
for (va = sva, m = PHYS_TO_VM_PAGE(oldpde & PG_PS_FRAME);
va < eva; va += PAGE_SIZE, m++)
if ((oldpde & (PG_M | PG_RW)) == (PG_M | PG_RW))
vm_page_dirty(m);
}
if ((prot & VM_PROT_WRITE) == 0)
newpde &= ~(PG_RW | PG_M);
if ((prot & VM_PROT_EXECUTE) == 0)
newpde |= pg_nx;
if (newpde != oldpde) {
if (!atomic_cmpset_long(pde, oldpde, newpde))
goto retry;
if (oldpde & PG_G)
pmap_invalidate_page(pmap, sva);
else
anychanged = TRUE;
}
return (anychanged);
}
/*
* Set the physical protection on the
* specified range of this map as requested.
*/
void
pmap_protect(pmap_t pmap, vm_offset_t sva, vm_offset_t eva, vm_prot_t prot)
{
vm_offset_t va_next;
pml4_entry_t *pml4e;
pdp_entry_t *pdpe;
pd_entry_t ptpaddr, *pde;
pt_entry_t *pte;
int anychanged;
boolean_t pv_lists_locked;
if ((prot & VM_PROT_READ) == VM_PROT_NONE) {
pmap_remove(pmap, sva, eva);
return;
}
if ((prot & (VM_PROT_WRITE|VM_PROT_EXECUTE)) ==
(VM_PROT_WRITE|VM_PROT_EXECUTE))
return;
pv_lists_locked = FALSE;
resume:
anychanged = 0;
PMAP_LOCK(pmap);
for (; sva < eva; sva = va_next) {
pml4e = pmap_pml4e(pmap, sva);
if ((*pml4e & PG_V) == 0) {
va_next = (sva + NBPML4) & ~PML4MASK;
if (va_next < sva)
va_next = eva;
continue;
}
pdpe = pmap_pml4e_to_pdpe(pml4e, sva);
if ((*pdpe & PG_V) == 0) {
va_next = (sva + NBPDP) & ~PDPMASK;
if (va_next < sva)
va_next = eva;
continue;
}
va_next = (sva + NBPDR) & ~PDRMASK;
if (va_next < sva)
va_next = eva;
pde = pmap_pdpe_to_pde(pdpe, sva);
ptpaddr = *pde;
/*
* Weed out invalid mappings.
*/
if (ptpaddr == 0)
continue;
/*
* Check for large page.
*/
if ((ptpaddr & PG_PS) != 0) {
/*
* Are we protecting the entire large page? If not,
* demote the mapping and fall through.
*/
if (sva + NBPDR == va_next && eva >= va_next) {
/*
* The TLB entry for a PG_G mapping is
* invalidated by pmap_protect_pde().
*/
if (pmap_protect_pde(pmap, pde, sva, prot))
anychanged = 1;
continue;
} else {
if (!pv_lists_locked) {
pv_lists_locked = TRUE;
if (!rw_try_wlock(&pvh_global_lock)) {
if (anychanged)
pmap_invalidate_all(
pmap);
PMAP_UNLOCK(pmap);
rw_wlock(&pvh_global_lock);
goto resume;
}
}
if (!pmap_demote_pde(pmap, pde, sva)) {
/*
* The large page mapping was
* destroyed.
*/
continue;
}
}
}
if (va_next > eva)
va_next = eva;
for (pte = pmap_pde_to_pte(pde, sva); sva != va_next; pte++,
sva += PAGE_SIZE) {
pt_entry_t obits, pbits;
vm_page_t m;
retry:
obits = pbits = *pte;
if ((pbits & PG_V) == 0)
continue;
if ((prot & VM_PROT_WRITE) == 0) {
if ((pbits & (PG_MANAGED | PG_M | PG_RW)) ==
(PG_MANAGED | PG_M | PG_RW)) {
m = PHYS_TO_VM_PAGE(pbits & PG_FRAME);
vm_page_dirty(m);
}
pbits &= ~(PG_RW | PG_M);
}
if ((prot & VM_PROT_EXECUTE) == 0)
pbits |= pg_nx;
if (pbits != obits) {
if (!atomic_cmpset_long(pte, obits, pbits))
goto retry;
if (obits & PG_G)
pmap_invalidate_page(pmap, sva);
else
anychanged = 1;
}
}
}
if (anychanged)
pmap_invalidate_all(pmap);
if (pv_lists_locked)
rw_wunlock(&pvh_global_lock);
PMAP_UNLOCK(pmap);
}
/*
* Tries to promote the 512, contiguous 4KB page mappings that are within a
* single page table page (PTP) to a single 2MB page mapping. For promotion
* to occur, two conditions must be met: (1) the 4KB page mappings must map
* aligned, contiguous physical memory and (2) the 4KB page mappings must have
* identical characteristics.
*/
static void
pmap_promote_pde(pmap_t pmap, pd_entry_t *pde, vm_offset_t va)
{
pd_entry_t newpde;
pt_entry_t *firstpte, oldpte, pa, *pte;
vm_offset_t oldpteva;
vm_page_t mpte;
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
/*
* Examine the first PTE in the specified PTP. Abort if this PTE is
* either invalid, unused, or does not map the first 4KB physical page
* within a 2MB page.
*/
firstpte = (pt_entry_t *)PHYS_TO_DMAP(*pde & PG_FRAME);
setpde:
newpde = *firstpte;
if ((newpde & ((PG_FRAME & PDRMASK) | PG_A | PG_V)) != (PG_A | PG_V)) {
pmap_pde_p_failures++;
CTR2(KTR_PMAP, "pmap_promote_pde: failure for va %#lx"
" in pmap %p", va, pmap);
return;
}
if ((newpde & (PG_M | PG_RW)) == PG_RW) {
/*
* When PG_M is already clear, PG_RW can be cleared without
* a TLB invalidation.
*/
if (!atomic_cmpset_long(firstpte, newpde, newpde & ~PG_RW))
goto setpde;
newpde &= ~PG_RW;
}
/*
* Examine each of the other PTEs in the specified PTP. Abort if this
* PTE maps an unexpected 4KB physical page or does not have identical
* characteristics to the first PTE.
*/
pa = (newpde & (PG_PS_FRAME | PG_A | PG_V)) + NBPDR - PAGE_SIZE;
for (pte = firstpte + NPTEPG - 1; pte > firstpte; pte--) {
setpte:
oldpte = *pte;
if ((oldpte & (PG_FRAME | PG_A | PG_V)) != pa) {
pmap_pde_p_failures++;
CTR2(KTR_PMAP, "pmap_promote_pde: failure for va %#lx"
" in pmap %p", va, pmap);
return;
}
if ((oldpte & (PG_M | PG_RW)) == PG_RW) {
/*
* When PG_M is already clear, PG_RW can be cleared
* without a TLB invalidation.
*/
if (!atomic_cmpset_long(pte, oldpte, oldpte & ~PG_RW))
goto setpte;
oldpte &= ~PG_RW;
oldpteva = (oldpte & PG_FRAME & PDRMASK) |
(va & ~PDRMASK);
CTR2(KTR_PMAP, "pmap_promote_pde: protect for va %#lx"
" in pmap %p", oldpteva, pmap);
}
if ((oldpte & PG_PTE_PROMOTE) != (newpde & PG_PTE_PROMOTE)) {
pmap_pde_p_failures++;
CTR2(KTR_PMAP, "pmap_promote_pde: failure for va %#lx"
" in pmap %p", va, pmap);
return;
}
pa -= PAGE_SIZE;
}
/*
* Save the page table page in its current state until the PDE
* mapping the superpage is demoted by pmap_demote_pde() or
* destroyed by pmap_remove_pde().
*/
mpte = PHYS_TO_VM_PAGE(*pde & PG_FRAME);
KASSERT(mpte >= vm_page_array &&
mpte < &vm_page_array[vm_page_array_size],
("pmap_promote_pde: page table page is out of range"));
KASSERT(mpte->pindex == pmap_pde_pindex(va),
("pmap_promote_pde: page table page's pindex is wrong"));
pmap_insert_pt_page(pmap, mpte);
/*
* Promote the pv entries.
*/
if ((newpde & PG_MANAGED) != 0)
pmap_pv_promote_pde(pmap, va, newpde & PG_PS_FRAME);
/*
* Propagate the PAT index to its proper position.
*/
if ((newpde & PG_PTE_PAT) != 0)
newpde ^= PG_PDE_PAT | PG_PTE_PAT;
/*
* Map the superpage.
*/
if (workaround_erratum383)
pmap_update_pde(pmap, va, pde, PG_PS | newpde);
else
pde_store(pde, PG_PS | newpde);
pmap_pde_promotions++;
CTR2(KTR_PMAP, "pmap_promote_pde: success for va %#lx"
" in pmap %p", va, pmap);
}
/*
* Insert the given physical page (p) at
* the specified virtual address (v) in the
* target physical map with the protection requested.
*
* If specified, the page will be wired down, meaning
* that the related pte can not be reclaimed.
*
* NB: This is the only routine which MAY NOT lazy-evaluate
* or lose information. That is, this routine must actually
* insert this page into the given map NOW.
*/
void
pmap_enter(pmap_t pmap, vm_offset_t va, vm_prot_t access, vm_page_t m,
vm_prot_t prot, boolean_t wired)
{
pd_entry_t *pde;
pt_entry_t *pte;
pt_entry_t newpte, origpte;
pv_entry_t pv;
vm_paddr_t opa, pa;
vm_page_t mpte, om;
boolean_t invlva;
va = trunc_page(va);
KASSERT(va <= VM_MAX_KERNEL_ADDRESS, ("pmap_enter: toobig"));
KASSERT(va < UPT_MIN_ADDRESS || va >= UPT_MAX_ADDRESS,
("pmap_enter: invalid to pmap_enter page table pages (va: 0x%lx)",
va));
KASSERT((m->oflags & (VPO_UNMANAGED | VPO_BUSY)) != 0 ||
VM_OBJECT_LOCKED(m->object),
("pmap_enter: page %p is not busy", m));
mpte = NULL;
rw_wlock(&pvh_global_lock);
PMAP_LOCK(pmap);
/*
* In the case that a page table page is not
* resident, we are creating it here.
*/
if (va < VM_MAXUSER_ADDRESS)
mpte = pmap_allocpte(pmap, va, M_WAITOK);
pde = pmap_pde(pmap, va);
if (pde != NULL && (*pde & PG_V) != 0) {
if ((*pde & PG_PS) != 0)
panic("pmap_enter: attempted pmap_enter on 2MB page");
pte = pmap_pde_to_pte(pde, va);
} else
panic("pmap_enter: invalid page directory va=%#lx", va);
pa = VM_PAGE_TO_PHYS(m);
om = NULL;
origpte = *pte;
opa = origpte & PG_FRAME;
/*
* Mapping has not changed, must be protection or wiring change.
*/
if (origpte && (opa == pa)) {
/*
* Wiring change, just update stats. We don't worry about
* wiring PT pages as they remain resident as long as there
* are valid mappings in them. Hence, if a user page is wired,
* the PT page will be also.
*/
if (wired && ((origpte & PG_W) == 0))
pmap->pm_stats.wired_count++;
else if (!wired && (origpte & PG_W))
pmap->pm_stats.wired_count--;
/*
* Remove extra pte reference
*/
if (mpte)
mpte->wire_count--;
if (origpte & PG_MANAGED) {
om = m;
pa |= PG_MANAGED;
}
goto validate;
}
pv = NULL;
/*
* Mapping has changed, invalidate old range and fall through to
* handle validating new mapping.
*/
if (opa) {
if (origpte & PG_W)
pmap->pm_stats.wired_count--;
if (origpte & PG_MANAGED) {
om = PHYS_TO_VM_PAGE(opa);
pv = pmap_pvh_remove(&om->md, pmap, va);
}
if (mpte != NULL) {
mpte->wire_count--;
KASSERT(mpte->wire_count > 0,
("pmap_enter: missing reference to page table page,"
" va: 0x%lx", va));
}
} else
pmap_resident_count_inc(pmap, 1);
/*
* Enter on the PV list if part of our managed memory.
*/
if ((m->oflags & VPO_UNMANAGED) == 0) {
KASSERT(va < kmi.clean_sva || va >= kmi.clean_eva,
("pmap_enter: managed mapping within the clean submap"));
if (pv == NULL)
pv = get_pv_entry(pmap, FALSE);
pv->pv_va = va;
TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list);
pa |= PG_MANAGED;
} else if (pv != NULL)
free_pv_entry(pmap, pv);
/*
* Increment counters
*/
if (wired)
pmap->pm_stats.wired_count++;
validate:
/*
* Now validate mapping with desired protection/wiring.
*/
newpte = (pt_entry_t)(pa | pmap_cache_bits(m->md.pat_mode, 0) | PG_V);
if ((prot & VM_PROT_WRITE) != 0) {
newpte |= PG_RW;
if ((newpte & PG_MANAGED) != 0)
vm_page_aflag_set(m, PGA_WRITEABLE);
}
if ((prot & VM_PROT_EXECUTE) == 0)
newpte |= pg_nx;
if (wired)
newpte |= PG_W;
if (va < VM_MAXUSER_ADDRESS)
newpte |= PG_U;
if (pmap == kernel_pmap)
newpte |= PG_G;
/*
* if the mapping or permission bits are different, we need
* to update the pte.
*/
if ((origpte & ~(PG_M|PG_A)) != newpte) {
newpte |= PG_A;
if ((access & VM_PROT_WRITE) != 0)
newpte |= PG_M;
if (origpte & PG_V) {
invlva = FALSE;
origpte = pte_load_store(pte, newpte);
if (origpte & PG_A) {
if (origpte & PG_MANAGED)
vm_page_aflag_set(om, PGA_REFERENCED);
if (opa != VM_PAGE_TO_PHYS(m) || ((origpte &
PG_NX) == 0 && (newpte & PG_NX)))
invlva = TRUE;
}
if ((origpte & (PG_M | PG_RW)) == (PG_M | PG_RW)) {
if ((origpte & PG_MANAGED) != 0)
vm_page_dirty(om);
if ((newpte & PG_RW) == 0)
invlva = TRUE;
}
if ((origpte & PG_MANAGED) != 0 &&
TAILQ_EMPTY(&om->md.pv_list) &&
((om->flags & PG_FICTITIOUS) != 0 ||
TAILQ_EMPTY(&pa_to_pvh(opa)->pv_list)))
vm_page_aflag_clear(om, PGA_WRITEABLE);
if (invlva)
pmap_invalidate_page(pmap, va);
} else
pte_store(pte, newpte);
}
/*
* If both the page table page and the reservation are fully
* populated, then attempt promotion.
*/
if ((mpte == NULL || mpte->wire_count == NPTEPG) &&
pg_ps_enabled && (m->flags & PG_FICTITIOUS) == 0 &&
vm_reserv_level_iffullpop(m) == 0)
pmap_promote_pde(pmap, pde, va);
rw_wunlock(&pvh_global_lock);
PMAP_UNLOCK(pmap);
}
/*
* Tries to create a 2MB page mapping. Returns TRUE if successful and FALSE
* otherwise. Fails if (1) a page table page cannot be allocated without
* blocking, (2) a mapping already exists at the specified virtual address, or
* (3) a pv entry cannot be allocated without reclaiming another pv entry.
*/
static boolean_t
pmap_enter_pde(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot)
{
pd_entry_t *pde, newpde;
vm_page_t free, mpde;
rw_assert(&pvh_global_lock, RA_WLOCKED);
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
if ((mpde = pmap_allocpde(pmap, va, M_NOWAIT)) == NULL) {
CTR2(KTR_PMAP, "pmap_enter_pde: failure for va %#lx"
" in pmap %p", va, pmap);
return (FALSE);
}
pde = (pd_entry_t *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(mpde));
pde = &pde[pmap_pde_index(va)];
if ((*pde & PG_V) != 0) {
KASSERT(mpde->wire_count > 1,
("pmap_enter_pde: mpde's wire count is too low"));
mpde->wire_count--;
CTR2(KTR_PMAP, "pmap_enter_pde: failure for va %#lx"
" in pmap %p", va, pmap);
return (FALSE);
}
newpde = VM_PAGE_TO_PHYS(m) | pmap_cache_bits(m->md.pat_mode, 1) |
PG_PS | PG_V;
if ((m->oflags & VPO_UNMANAGED) == 0) {
newpde |= PG_MANAGED;
/*
* Abort this mapping if its PV entry could not be created.
*/
if (!pmap_pv_insert_pde(pmap, va, VM_PAGE_TO_PHYS(m))) {
free = NULL;
if (pmap_unwire_pte_hold(pmap, va, mpde, &free)) {
pmap_invalidate_page(pmap, va);
pmap_free_zero_pages(free);
}
CTR2(KTR_PMAP, "pmap_enter_pde: failure for va %#lx"
" in pmap %p", va, pmap);
return (FALSE);
}
}
if ((prot & VM_PROT_EXECUTE) == 0)
newpde |= pg_nx;
if (va < VM_MAXUSER_ADDRESS)
newpde |= PG_U;
/*
* Increment counters.
*/
pmap_resident_count_inc(pmap, NBPDR / PAGE_SIZE);
/*
* Map the superpage.
*/
pde_store(pde, newpde);
pmap_pde_mappings++;
CTR2(KTR_PMAP, "pmap_enter_pde: success for va %#lx"
" in pmap %p", va, pmap);
return (TRUE);
}
/*
* Maps a sequence of resident pages belonging to the same object.
* The sequence begins with the given page m_start. This page is
* mapped at the given virtual address start. Each subsequent page is
* mapped at a virtual address that is offset from start by the same
* amount as the page is offset from m_start within the object. The
* last page in the sequence is the page with the largest offset from
* m_start that can be mapped at a virtual address less than the given
* virtual address end. Not every virtual page between start and end
* is mapped; only those for which a resident page exists with the
* corresponding offset from m_start are mapped.
*/
void
pmap_enter_object(pmap_t pmap, vm_offset_t start, vm_offset_t end,
vm_page_t m_start, vm_prot_t prot)
{
vm_offset_t va;
vm_page_t m, mpte;
vm_pindex_t diff, psize;
VM_OBJECT_LOCK_ASSERT(m_start->object, MA_OWNED);
psize = atop(end - start);
mpte = NULL;
m = m_start;
rw_wlock(&pvh_global_lock);
PMAP_LOCK(pmap);
while (m != NULL && (diff = m->pindex - m_start->pindex) < psize) {
va = start + ptoa(diff);
if ((va & PDRMASK) == 0 && va + NBPDR <= end &&
(VM_PAGE_TO_PHYS(m) & PDRMASK) == 0 &&
pg_ps_enabled && vm_reserv_level_iffullpop(m) == 0 &&
pmap_enter_pde(pmap, va, m, prot))
m = &m[NBPDR / PAGE_SIZE - 1];
else
mpte = pmap_enter_quick_locked(pmap, va, m, prot,
mpte);
m = TAILQ_NEXT(m, listq);
}
rw_wunlock(&pvh_global_lock);
PMAP_UNLOCK(pmap);
}
/*
* this code makes some *MAJOR* assumptions:
* 1. Current pmap & pmap exists.
* 2. Not wired.
* 3. Read access.
* 4. No page table pages.
* but is *MUCH* faster than pmap_enter...
*/
void
pmap_enter_quick(pmap_t pmap, vm_offset_t va, vm_page_t m, vm_prot_t prot)
{
rw_wlock(&pvh_global_lock);
PMAP_LOCK(pmap);
(void)pmap_enter_quick_locked(pmap, va, m, prot, NULL);
rw_wunlock(&pvh_global_lock);
PMAP_UNLOCK(pmap);
}
static vm_page_t
pmap_enter_quick_locked(pmap_t pmap, vm_offset_t va, vm_page_t m,
vm_prot_t prot, vm_page_t mpte)
{
vm_page_t free;
pt_entry_t *pte;
vm_paddr_t pa;
KASSERT(va < kmi.clean_sva || va >= kmi.clean_eva ||
(m->oflags & VPO_UNMANAGED) != 0,
("pmap_enter_quick_locked: managed mapping within the clean submap"));
rw_assert(&pvh_global_lock, RA_WLOCKED);
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
/*
* In the case that a page table page is not
* resident, we are creating it here.
*/
if (va < VM_MAXUSER_ADDRESS) {
vm_pindex_t ptepindex;
pd_entry_t *ptepa;
/*
* Calculate pagetable page index
*/
ptepindex = pmap_pde_pindex(va);
if (mpte && (mpte->pindex == ptepindex)) {
mpte->wire_count++;
} else {
/*
* Get the page directory entry
*/
ptepa = pmap_pde(pmap, va);
/*
* If the page table page is mapped, we just increment
* the hold count, and activate it.
*/
if (ptepa && (*ptepa & PG_V) != 0) {
if (*ptepa & PG_PS)
return (NULL);
mpte = PHYS_TO_VM_PAGE(*ptepa & PG_FRAME);
mpte->wire_count++;
} else {
mpte = _pmap_allocpte(pmap, ptepindex,
M_NOWAIT);
if (mpte == NULL)
return (mpte);
}
}
pte = (pt_entry_t *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(mpte));
pte = &pte[pmap_pte_index(va)];
} else {
mpte = NULL;
pte = vtopte(va);
}
if (*pte) {
if (mpte != NULL) {
mpte->wire_count--;
mpte = NULL;
}
return (mpte);
}
/*
* Enter on the PV list if part of our managed memory.
*/
if ((m->oflags & VPO_UNMANAGED) == 0 &&
!pmap_try_insert_pv_entry(pmap, va, m)) {
if (mpte != NULL) {
free = NULL;
if (pmap_unwire_pte_hold(pmap, va, mpte, &free)) {
pmap_invalidate_page(pmap, va);
pmap_free_zero_pages(free);
}
mpte = NULL;
}
return (mpte);
}
/*
* Increment counters
*/
pmap_resident_count_inc(pmap, 1);
pa = VM_PAGE_TO_PHYS(m) | pmap_cache_bits(m->md.pat_mode, 0);
if ((prot & VM_PROT_EXECUTE) == 0)
pa |= pg_nx;
/*
* Now validate mapping with RO protection
*/
if ((m->oflags & VPO_UNMANAGED) != 0)
pte_store(pte, pa | PG_V | PG_U);
else
pte_store(pte, pa | PG_V | PG_U | PG_MANAGED);
return (mpte);
}
/*
* Make a temporary mapping for a physical address. This is only intended
* to be used for panic dumps.
*/
void *
pmap_kenter_temporary(vm_paddr_t pa, int i)
{
vm_offset_t va;
va = (vm_offset_t)crashdumpmap + (i * PAGE_SIZE);
pmap_kenter(va, pa);
invlpg(va);
return ((void *)crashdumpmap);
}
/*
* This code maps large physical mmap regions into the
* processor address space. Note that some shortcuts
* are taken, but the code works.
*/
void
pmap_object_init_pt(pmap_t pmap, vm_offset_t addr, vm_object_t object,
vm_pindex_t pindex, vm_size_t size)
{
pd_entry_t *pde;
vm_paddr_t pa, ptepa;
vm_page_t p, pdpg;
int pat_mode;
VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
KASSERT(object->type == OBJT_DEVICE || object->type == OBJT_SG,
("pmap_object_init_pt: non-device object"));
if ((addr & (NBPDR - 1)) == 0 && (size & (NBPDR - 1)) == 0) {
if (!vm_object_populate(object, pindex, pindex + atop(size)))
return;
p = vm_page_lookup(object, pindex);
KASSERT(p->valid == VM_PAGE_BITS_ALL,
("pmap_object_init_pt: invalid page %p", p));
pat_mode = p->md.pat_mode;
/*
* Abort the mapping if the first page is not physically
* aligned to a 2MB page boundary.
*/
ptepa = VM_PAGE_TO_PHYS(p);
if (ptepa & (NBPDR - 1))
return;
/*
* Skip the first page. Abort the mapping if the rest of
* the pages are not physically contiguous or have differing
* memory attributes.
*/
p = TAILQ_NEXT(p, listq);
for (pa = ptepa + PAGE_SIZE; pa < ptepa + size;
pa += PAGE_SIZE) {
KASSERT(p->valid == VM_PAGE_BITS_ALL,
("pmap_object_init_pt: invalid page %p", p));
if (pa != VM_PAGE_TO_PHYS(p) ||
pat_mode != p->md.pat_mode)
return;
p = TAILQ_NEXT(p, listq);
}
/*
* Map using 2MB pages. Since "ptepa" is 2M aligned and
* "size" is a multiple of 2M, adding the PAT setting to "pa"
* will not affect the termination of this loop.
*/
PMAP_LOCK(pmap);
for (pa = ptepa | pmap_cache_bits(pat_mode, 1); pa < ptepa +
size; pa += NBPDR) {
pdpg = pmap_allocpde(pmap, addr, M_NOWAIT);
if (pdpg == NULL) {
/*
* The creation of mappings below is only an
* optimization. If a page directory page
* cannot be allocated without blocking,
* continue on to the next mapping rather than
* blocking.
*/
addr += NBPDR;
continue;
}
pde = (pd_entry_t *)PHYS_TO_DMAP(VM_PAGE_TO_PHYS(pdpg));
pde = &pde[pmap_pde_index(addr)];
if ((*pde & PG_V) == 0) {
pde_store(pde, pa | PG_PS | PG_M | PG_A |
PG_U | PG_RW | PG_V);
pmap_resident_count_inc(pmap, NBPDR / PAGE_SIZE);
pmap_pde_mappings++;
} else {
/* Continue on if the PDE is already valid. */
pdpg->wire_count--;
KASSERT(pdpg->wire_count > 0,
("pmap_object_init_pt: missing reference "
"to page directory page, va: 0x%lx", addr));
}
addr += NBPDR;
}
PMAP_UNLOCK(pmap);
}
}
/*
* Routine: pmap_change_wiring
* Function: Change the wiring attribute for a map/virtual-address
* pair.
* In/out conditions:
* The mapping must already exist in the pmap.
*/
void
pmap_change_wiring(pmap_t pmap, vm_offset_t va, boolean_t wired)
{
pd_entry_t *pde;
pt_entry_t *pte;
boolean_t are_queues_locked;
are_queues_locked = FALSE;
/*
* Wiring is not a hardware characteristic so there is no need to
* invalidate TLB.
*/
retry:
PMAP_LOCK(pmap);
pde = pmap_pde(pmap, va);
if ((*pde & PG_PS) != 0) {
if (!wired != ((*pde & PG_W) == 0)) {
if (!are_queues_locked) {
are_queues_locked = TRUE;
if (!rw_try_wlock(&pvh_global_lock)) {
PMAP_UNLOCK(pmap);
rw_wlock(&pvh_global_lock);
goto retry;
}
}
if (!pmap_demote_pde(pmap, pde, va))
panic("pmap_change_wiring: demotion failed");
} else
goto out;
}
pte = pmap_pde_to_pte(pde, va);
if (wired && (*pte & PG_W) == 0) {
pmap->pm_stats.wired_count++;
atomic_set_long(pte, PG_W);
} else if (!wired && (*pte & PG_W) != 0) {
pmap->pm_stats.wired_count--;
atomic_clear_long(pte, PG_W);
}
out:
if (are_queues_locked)
rw_wunlock(&pvh_global_lock);
PMAP_UNLOCK(pmap);
}
/*
* Copy the range specified by src_addr/len
* from the source map to the range dst_addr/len
* in the destination map.
*
* This routine is only advisory and need not do anything.
*/
void
pmap_copy(pmap_t dst_pmap, pmap_t src_pmap, vm_offset_t dst_addr, vm_size_t len,
vm_offset_t src_addr)
{
vm_page_t free;
vm_offset_t addr;
vm_offset_t end_addr = src_addr + len;
vm_offset_t va_next;
if (dst_addr != src_addr)
return;
rw_wlock(&pvh_global_lock);
if (dst_pmap < src_pmap) {
PMAP_LOCK(dst_pmap);
PMAP_LOCK(src_pmap);
} else {
PMAP_LOCK(src_pmap);
PMAP_LOCK(dst_pmap);
}
for (addr = src_addr; addr < end_addr; addr = va_next) {
pt_entry_t *src_pte, *dst_pte;
vm_page_t dstmpde, dstmpte, srcmpte;
pml4_entry_t *pml4e;
pdp_entry_t *pdpe;
pd_entry_t srcptepaddr, *pde;
KASSERT(addr < UPT_MIN_ADDRESS,
("pmap_copy: invalid to pmap_copy page tables"));
pml4e = pmap_pml4e(src_pmap, addr);
if ((*pml4e & PG_V) == 0) {
va_next = (addr + NBPML4) & ~PML4MASK;
if (va_next < addr)
va_next = end_addr;
continue;
}
pdpe = pmap_pml4e_to_pdpe(pml4e, addr);
if ((*pdpe & PG_V) == 0) {
va_next = (addr + NBPDP) & ~PDPMASK;
if (va_next < addr)
va_next = end_addr;
continue;
}
va_next = (addr + NBPDR) & ~PDRMASK;
if (va_next < addr)
va_next = end_addr;
pde = pmap_pdpe_to_pde(pdpe, addr);
srcptepaddr = *pde;
if (srcptepaddr == 0)
continue;
if (srcptepaddr & PG_PS) {
dstmpde = pmap_allocpde(dst_pmap, addr, M_NOWAIT);
if (dstmpde == NULL)
break;
pde = (pd_entry_t *)
PHYS_TO_DMAP(VM_PAGE_TO_PHYS(dstmpde));
pde = &pde[pmap_pde_index(addr)];
if (*pde == 0 && ((srcptepaddr & PG_MANAGED) == 0 ||
pmap_pv_insert_pde(dst_pmap, addr, srcptepaddr &
PG_PS_FRAME))) {
*pde = srcptepaddr & ~PG_W;
pmap_resident_count_inc(dst_pmap, NBPDR / PAGE_SIZE);
} else
dstmpde->wire_count--;
continue;
}
srcptepaddr &= PG_FRAME;
srcmpte = PHYS_TO_VM_PAGE(srcptepaddr);
KASSERT(srcmpte->wire_count > 0,
("pmap_copy: source page table page is unused"));
if (va_next > end_addr)
va_next = end_addr;
src_pte = (pt_entry_t *)PHYS_TO_DMAP(srcptepaddr);
src_pte = &src_pte[pmap_pte_index(addr)];
dstmpte = NULL;
while (addr < va_next) {
pt_entry_t ptetemp;
ptetemp = *src_pte;
/*
* we only virtual copy managed pages
*/
if ((ptetemp & PG_MANAGED) != 0) {
if (dstmpte != NULL &&
dstmpte->pindex == pmap_pde_pindex(addr))
dstmpte->wire_count++;
else if ((dstmpte = pmap_allocpte(dst_pmap,
addr, M_NOWAIT)) == NULL)
goto out;
dst_pte = (pt_entry_t *)
PHYS_TO_DMAP(VM_PAGE_TO_PHYS(dstmpte));
dst_pte = &dst_pte[pmap_pte_index(addr)];
if (*dst_pte == 0 &&
pmap_try_insert_pv_entry(dst_pmap, addr,
PHYS_TO_VM_PAGE(ptetemp & PG_FRAME))) {
/*
* Clear the wired, modified, and
* accessed (referenced) bits
* during the copy.
*/
*dst_pte = ptetemp & ~(PG_W | PG_M |
PG_A);
pmap_resident_count_inc(dst_pmap, 1);
} else {
free = NULL;
if (pmap_unwire_pte_hold(dst_pmap,
addr, dstmpte, &free)) {
pmap_invalidate_page(dst_pmap,
addr);
pmap_free_zero_pages(free);
}
goto out;
}
if (dstmpte->wire_count >= srcmpte->wire_count)
break;
}
addr += PAGE_SIZE;
src_pte++;
}
}
out:
rw_wunlock(&pvh_global_lock);
PMAP_UNLOCK(src_pmap);
PMAP_UNLOCK(dst_pmap);
}
/*
* pmap_zero_page zeros the specified hardware page by mapping
* the page into KVM and using bzero to clear its contents.
*/
void
pmap_zero_page(vm_page_t m)
{
vm_offset_t va = PHYS_TO_DMAP(VM_PAGE_TO_PHYS(m));
pagezero((void *)va);
}
/*
* pmap_zero_page_area zeros the specified hardware page by mapping
* the page into KVM and using bzero to clear its contents.
*
* off and size may not cover an area beyond a single hardware page.
*/
void
pmap_zero_page_area(vm_page_t m, int off, int size)
{
vm_offset_t va = PHYS_TO_DMAP(VM_PAGE_TO_PHYS(m));
if (off == 0 && size == PAGE_SIZE)
pagezero((void *)va);
else
bzero((char *)va + off, size);
}
/*
* pmap_zero_page_idle zeros the specified hardware page by mapping
* the page into KVM and using bzero to clear its contents. This
* is intended to be called from the vm_pagezero process only and
* outside of Giant.
*/
void
pmap_zero_page_idle(vm_page_t m)
{
vm_offset_t va = PHYS_TO_DMAP(VM_PAGE_TO_PHYS(m));
pagezero((void *)va);
}
/*
* pmap_copy_page copies the specified (machine independent)
* page by mapping the page into virtual memory and using
* bcopy to copy the page, one machine dependent page at a
* time.
*/
void
pmap_copy_page(vm_page_t msrc, vm_page_t mdst)
{
vm_offset_t src = PHYS_TO_DMAP(VM_PAGE_TO_PHYS(msrc));
vm_offset_t dst = PHYS_TO_DMAP(VM_PAGE_TO_PHYS(mdst));
pagecopy((void *)src, (void *)dst);
}
/*
* Returns true if the pmap's pv is one of the first
* 16 pvs linked to from this page. This count may
* be changed upwards or downwards in the future; it
* is only necessary that true be returned for a small
* subset of pmaps for proper page aging.
*/
boolean_t
pmap_page_exists_quick(pmap_t pmap, vm_page_t m)
{
struct md_page *pvh;
pv_entry_t pv;
int loops = 0;
boolean_t rv;
KASSERT((m->oflags & VPO_UNMANAGED) == 0,
("pmap_page_exists_quick: page %p is not managed", m));
rv = FALSE;
rw_wlock(&pvh_global_lock);
TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) {
if (PV_PMAP(pv) == pmap) {
rv = TRUE;
break;
}
loops++;
if (loops >= 16)
break;
}
if (!rv && loops < 16 && (m->flags & PG_FICTITIOUS) == 0) {
pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m));
TAILQ_FOREACH(pv, &pvh->pv_list, pv_list) {
if (PV_PMAP(pv) == pmap) {
rv = TRUE;
break;
}
loops++;
if (loops >= 16)
break;
}
}
rw_wunlock(&pvh_global_lock);
return (rv);
}
/*
* pmap_page_wired_mappings:
*
* Return the number of managed mappings to the given physical page
* that are wired.
*/
int
pmap_page_wired_mappings(vm_page_t m)
{
int count;
count = 0;
if ((m->oflags & VPO_UNMANAGED) != 0)
return (count);
rw_wlock(&pvh_global_lock);
count = pmap_pvh_wired_mappings(&m->md, count);
if ((m->flags & PG_FICTITIOUS) == 0) {
count = pmap_pvh_wired_mappings(pa_to_pvh(VM_PAGE_TO_PHYS(m)),
count);
}
rw_wunlock(&pvh_global_lock);
return (count);
}
/*
* pmap_pvh_wired_mappings:
*
* Return the updated number "count" of managed mappings that are wired.
*/
static int
pmap_pvh_wired_mappings(struct md_page *pvh, int count)
{
pmap_t pmap;
pt_entry_t *pte;
pv_entry_t pv;
rw_assert(&pvh_global_lock, RA_WLOCKED);
TAILQ_FOREACH(pv, &pvh->pv_list, pv_list) {
pmap = PV_PMAP(pv);
PMAP_LOCK(pmap);
pte = pmap_pte(pmap, pv->pv_va);
if ((*pte & PG_W) != 0)
count++;
PMAP_UNLOCK(pmap);
}
return (count);
}
/*
* Returns TRUE if the given page is mapped individually or as part of
* a 2mpage. Otherwise, returns FALSE.
*/
boolean_t
pmap_page_is_mapped(vm_page_t m)
{
boolean_t rv;
if ((m->oflags & VPO_UNMANAGED) != 0)
return (FALSE);
rw_wlock(&pvh_global_lock);
rv = !TAILQ_EMPTY(&m->md.pv_list) ||
((m->flags & PG_FICTITIOUS) == 0 &&
!TAILQ_EMPTY(&pa_to_pvh(VM_PAGE_TO_PHYS(m))->pv_list));
rw_wunlock(&pvh_global_lock);
return (rv);
}
/*
* Remove all pages from specified address space
* this aids process exit speeds. Also, this code
* is special cased for current process only, but
* can have the more generic (and slightly slower)
* mode enabled. This is much faster than pmap_remove
* in the case of running down an entire address space.
*/
void
pmap_remove_pages(pmap_t pmap)
{
pd_entry_t ptepde;
pt_entry_t *pte, tpte;
vm_page_t free = NULL;
vm_page_t m, mpte, mt;
pv_entry_t pv;
struct md_page *pvh;
struct pv_chunk *pc, *npc;
int field, idx;
int64_t bit;
uint64_t inuse, bitmask;
int allfree;
if (pmap != PCPU_GET(curpmap)) {
printf("warning: pmap_remove_pages called with non-current pmap\n");
return;
}
rw_wlock(&pvh_global_lock);
PMAP_LOCK(pmap);
TAILQ_FOREACH_SAFE(pc, &pmap->pm_pvchunk, pc_list, npc) {
allfree = 1;
for (field = 0; field < _NPCM; field++) {
inuse = ~pc->pc_map[field] & pc_freemask[field];
while (inuse != 0) {
bit = bsfq(inuse);
bitmask = 1UL << bit;
idx = field * 64 + bit;
pv = &pc->pc_pventry[idx];
inuse &= ~bitmask;
pte = pmap_pdpe(pmap, pv->pv_va);
ptepde = *pte;
pte = pmap_pdpe_to_pde(pte, pv->pv_va);
tpte = *pte;
if ((tpte & (PG_PS | PG_V)) == PG_V) {
ptepde = tpte;
pte = (pt_entry_t *)PHYS_TO_DMAP(tpte &
PG_FRAME);
pte = &pte[pmap_pte_index(pv->pv_va)];
tpte = *pte & ~PG_PTE_PAT;
}
if ((tpte & PG_V) == 0)
panic("bad pte");
/*
* We cannot remove wired pages from a process' mapping at this time
*/
if (tpte & PG_W) {
allfree = 0;
continue;
}
m = PHYS_TO_VM_PAGE(tpte & PG_FRAME);
KASSERT(m->phys_addr == (tpte & PG_FRAME),
("vm_page_t %p phys_addr mismatch %016jx %016jx",
m, (uintmax_t)m->phys_addr,
(uintmax_t)tpte));
KASSERT((m->flags & PG_FICTITIOUS) != 0 ||
m < &vm_page_array[vm_page_array_size],
("pmap_remove_pages: bad tpte %#jx",
(uintmax_t)tpte));
pte_clear(pte);
/*
* Update the vm_page_t clean/reference bits.
*/
if ((tpte & (PG_M | PG_RW)) == (PG_M | PG_RW)) {
if ((tpte & PG_PS) != 0) {
for (mt = m; mt < &m[NBPDR / PAGE_SIZE]; mt++)
vm_page_dirty(mt);
} else
vm_page_dirty(m);
}
/* Mark free */
PV_STAT(pv_entry_frees++);
PV_STAT(pv_entry_spare++);
pv_entry_count--;
pc->pc_map[field] |= bitmask;
if ((tpte & PG_PS) != 0) {
pmap_resident_count_dec(pmap, NBPDR / PAGE_SIZE);
pvh = pa_to_pvh(tpte & PG_PS_FRAME);
TAILQ_REMOVE(&pvh->pv_list, pv, pv_list);
if (TAILQ_EMPTY(&pvh->pv_list)) {
for (mt = m; mt < &m[NBPDR / PAGE_SIZE]; mt++)
if ((mt->aflags & PGA_WRITEABLE) != 0 &&
TAILQ_EMPTY(&mt->md.pv_list))
vm_page_aflag_clear(mt, PGA_WRITEABLE);
}
mpte = pmap_lookup_pt_page(pmap, pv->pv_va);
if (mpte != NULL) {
pmap_remove_pt_page(pmap, mpte);
pmap_resident_count_dec(pmap, 1);
KASSERT(mpte->wire_count == NPTEPG,
("pmap_remove_pages: pte page wire count error"));
mpte->wire_count = 0;
pmap_add_delayed_free_list(mpte, &free, FALSE);
atomic_subtract_int(&cnt.v_wire_count, 1);
}
} else {
pmap_resident_count_dec(pmap, 1);
TAILQ_REMOVE(&m->md.pv_list, pv, pv_list);
if ((m->aflags & PGA_WRITEABLE) != 0 &&
TAILQ_EMPTY(&m->md.pv_list) &&
(m->flags & PG_FICTITIOUS) == 0) {
pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m));
if (TAILQ_EMPTY(&pvh->pv_list))
vm_page_aflag_clear(m, PGA_WRITEABLE);
}
}
pmap_unuse_pt(pmap, pv->pv_va, ptepde, &free);
}
}
if (allfree) {
TAILQ_REMOVE(&pmap->pm_pvchunk, pc, pc_list);
free_pv_chunk(pc);
}
}
pmap_invalidate_all(pmap);
rw_wunlock(&pvh_global_lock);
PMAP_UNLOCK(pmap);
pmap_free_zero_pages(free);
}
/*
* pmap_is_modified:
*
* Return whether or not the specified physical page was modified
* in any physical maps.
*/
boolean_t
pmap_is_modified(vm_page_t m)
{
boolean_t rv;
KASSERT((m->oflags & VPO_UNMANAGED) == 0,
("pmap_is_modified: page %p is not managed", m));
/*
* If the page is not VPO_BUSY, then PGA_WRITEABLE cannot be
* concurrently set while the object is locked. Thus, if PGA_WRITEABLE
* is clear, no PTEs can have PG_M set.
*/
VM_OBJECT_LOCK_ASSERT(m->object, MA_OWNED);
if ((m->oflags & VPO_BUSY) == 0 &&
(m->aflags & PGA_WRITEABLE) == 0)
return (FALSE);
rw_wlock(&pvh_global_lock);
rv = pmap_is_modified_pvh(&m->md) ||
((m->flags & PG_FICTITIOUS) == 0 &&
pmap_is_modified_pvh(pa_to_pvh(VM_PAGE_TO_PHYS(m))));
rw_wunlock(&pvh_global_lock);
return (rv);
}
/*
* Returns TRUE if any of the given mappings were used to modify
* physical memory. Otherwise, returns FALSE. Both page and 2mpage
* mappings are supported.
*/
static boolean_t
pmap_is_modified_pvh(struct md_page *pvh)
{
pv_entry_t pv;
pt_entry_t *pte;
pmap_t pmap;
boolean_t rv;
rw_assert(&pvh_global_lock, RA_WLOCKED);
rv = FALSE;
TAILQ_FOREACH(pv, &pvh->pv_list, pv_list) {
pmap = PV_PMAP(pv);
PMAP_LOCK(pmap);
pte = pmap_pte(pmap, pv->pv_va);
rv = (*pte & (PG_M | PG_RW)) == (PG_M | PG_RW);
PMAP_UNLOCK(pmap);
if (rv)
break;
}
return (rv);
}
/*
* pmap_is_prefaultable:
*
* Return whether or not the specified virtual address is elgible
* for prefault.
*/
boolean_t
pmap_is_prefaultable(pmap_t pmap, vm_offset_t addr)
{
pd_entry_t *pde;
pt_entry_t *pte;
boolean_t rv;
rv = FALSE;
PMAP_LOCK(pmap);
pde = pmap_pde(pmap, addr);
if (pde != NULL && (*pde & (PG_PS | PG_V)) == PG_V) {
pte = pmap_pde_to_pte(pde, addr);
rv = (*pte & PG_V) == 0;
}
PMAP_UNLOCK(pmap);
return (rv);
}
/*
* pmap_is_referenced:
*
* Return whether or not the specified physical page was referenced
* in any physical maps.
*/
boolean_t
pmap_is_referenced(vm_page_t m)
{
boolean_t rv;
KASSERT((m->oflags & VPO_UNMANAGED) == 0,
("pmap_is_referenced: page %p is not managed", m));
rw_wlock(&pvh_global_lock);
rv = pmap_is_referenced_pvh(&m->md) ||
((m->flags & PG_FICTITIOUS) == 0 &&
pmap_is_referenced_pvh(pa_to_pvh(VM_PAGE_TO_PHYS(m))));
rw_wunlock(&pvh_global_lock);
return (rv);
}
/*
* Returns TRUE if any of the given mappings were referenced and FALSE
* otherwise. Both page and 2mpage mappings are supported.
*/
static boolean_t
pmap_is_referenced_pvh(struct md_page *pvh)
{
pv_entry_t pv;
pt_entry_t *pte;
pmap_t pmap;
boolean_t rv;
rw_assert(&pvh_global_lock, RA_WLOCKED);
rv = FALSE;
TAILQ_FOREACH(pv, &pvh->pv_list, pv_list) {
pmap = PV_PMAP(pv);
PMAP_LOCK(pmap);
pte = pmap_pte(pmap, pv->pv_va);
rv = (*pte & (PG_A | PG_V)) == (PG_A | PG_V);
PMAP_UNLOCK(pmap);
if (rv)
break;
}
return (rv);
}
/*
* Clear the write and modified bits in each of the given page's mappings.
*/
void
pmap_remove_write(vm_page_t m)
{
struct md_page *pvh;
pmap_t pmap;
pv_entry_t next_pv, pv;
pd_entry_t *pde;
pt_entry_t oldpte, *pte;
vm_offset_t va;
KASSERT((m->oflags & VPO_UNMANAGED) == 0,
("pmap_remove_write: page %p is not managed", m));
/*
* If the page is not VPO_BUSY, then PGA_WRITEABLE cannot be set by
* another thread while the object is locked. Thus, if PGA_WRITEABLE
* is clear, no page table entries need updating.
*/
VM_OBJECT_LOCK_ASSERT(m->object, MA_OWNED);
if ((m->oflags & VPO_BUSY) == 0 &&
(m->aflags & PGA_WRITEABLE) == 0)
return;
rw_wlock(&pvh_global_lock);
if ((m->flags & PG_FICTITIOUS) != 0)
goto small_mappings;
pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m));
TAILQ_FOREACH_SAFE(pv, &pvh->pv_list, pv_list, next_pv) {
pmap = PV_PMAP(pv);
PMAP_LOCK(pmap);
va = pv->pv_va;
pde = pmap_pde(pmap, va);
if ((*pde & PG_RW) != 0)
(void)pmap_demote_pde(pmap, pde, va);
PMAP_UNLOCK(pmap);
}
small_mappings:
TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) {
pmap = PV_PMAP(pv);
PMAP_LOCK(pmap);
pde = pmap_pde(pmap, pv->pv_va);
KASSERT((*pde & PG_PS) == 0,
("pmap_remove_write: found a 2mpage in page %p's pv list",
m));
pte = pmap_pde_to_pte(pde, pv->pv_va);
retry:
oldpte = *pte;
if (oldpte & PG_RW) {
if (!atomic_cmpset_long(pte, oldpte, oldpte &
~(PG_RW | PG_M)))
goto retry;
if ((oldpte & PG_M) != 0)
vm_page_dirty(m);
pmap_invalidate_page(pmap, pv->pv_va);
}
PMAP_UNLOCK(pmap);
}
vm_page_aflag_clear(m, PGA_WRITEABLE);
rw_wunlock(&pvh_global_lock);
}
/*
* pmap_ts_referenced:
*
* Return a count of reference bits for a page, clearing those bits.
* It is not necessary for every reference bit to be cleared, but it
* is necessary that 0 only be returned when there are truly no
* reference bits set.
*
* XXX: The exact number of bits to check and clear is a matter that
* should be tested and standardized at some point in the future for
* optimal aging of shared pages.
*/
int
pmap_ts_referenced(vm_page_t m)
{
struct md_page *pvh;
pv_entry_t pv, pvf, pvn;
pmap_t pmap;
pd_entry_t oldpde, *pde;
pt_entry_t *pte;
vm_offset_t va;
int rtval = 0;
KASSERT((m->oflags & VPO_UNMANAGED) == 0,
("pmap_ts_referenced: page %p is not managed", m));
rw_wlock(&pvh_global_lock);
if ((m->flags & PG_FICTITIOUS) != 0)
goto small_mappings;
pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m));
TAILQ_FOREACH_SAFE(pv, &pvh->pv_list, pv_list, pvn) {
pmap = PV_PMAP(pv);
PMAP_LOCK(pmap);
va = pv->pv_va;
pde = pmap_pde(pmap, va);
oldpde = *pde;
if ((oldpde & PG_A) != 0) {
if (pmap_demote_pde(pmap, pde, va)) {
if ((oldpde & PG_W) == 0) {
/*
* Remove the mapping to a single page
* so that a subsequent access may
* repromote. Since the underlying
* page table page is fully populated,
* this removal never frees a page
* table page.
*/
va += VM_PAGE_TO_PHYS(m) - (oldpde &
PG_PS_FRAME);
pmap_remove_page(pmap, va, pde, NULL);
rtval++;
if (rtval > 4) {
PMAP_UNLOCK(pmap);
goto out;
}
}
}
}
PMAP_UNLOCK(pmap);
}
small_mappings:
if ((pv = TAILQ_FIRST(&m->md.pv_list)) != NULL) {
pvf = pv;
do {
pvn = TAILQ_NEXT(pv, pv_list);
TAILQ_REMOVE(&m->md.pv_list, pv, pv_list);
TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list);
pmap = PV_PMAP(pv);
PMAP_LOCK(pmap);
pde = pmap_pde(pmap, pv->pv_va);
KASSERT((*pde & PG_PS) == 0, ("pmap_ts_referenced:"
" found a 2mpage in page %p's pv list", m));
pte = pmap_pde_to_pte(pde, pv->pv_va);
if ((*pte & PG_A) != 0) {
atomic_clear_long(pte, PG_A);
pmap_invalidate_page(pmap, pv->pv_va);
rtval++;
if (rtval > 4)
pvn = NULL;
}
PMAP_UNLOCK(pmap);
} while ((pv = pvn) != NULL && pv != pvf);
}
out:
rw_wunlock(&pvh_global_lock);
return (rtval);
}
/*
* Clear the modify bits on the specified physical page.
*/
void
pmap_clear_modify(vm_page_t m)
{
struct md_page *pvh;
pmap_t pmap;
pv_entry_t next_pv, pv;
pd_entry_t oldpde, *pde;
pt_entry_t oldpte, *pte;
vm_offset_t va;
KASSERT((m->oflags & VPO_UNMANAGED) == 0,
("pmap_clear_modify: page %p is not managed", m));
VM_OBJECT_LOCK_ASSERT(m->object, MA_OWNED);
KASSERT((m->oflags & VPO_BUSY) == 0,
("pmap_clear_modify: page %p is busy", m));
/*
* If the page is not PGA_WRITEABLE, then no PTEs can have PG_M set.
* If the object containing the page is locked and the page is not
* VPO_BUSY, then PGA_WRITEABLE cannot be concurrently set.
*/
if ((m->aflags & PGA_WRITEABLE) == 0)
return;
rw_wlock(&pvh_global_lock);
if ((m->flags & PG_FICTITIOUS) != 0)
goto small_mappings;
pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m));
TAILQ_FOREACH_SAFE(pv, &pvh->pv_list, pv_list, next_pv) {
pmap = PV_PMAP(pv);
PMAP_LOCK(pmap);
va = pv->pv_va;
pde = pmap_pde(pmap, va);
oldpde = *pde;
if ((oldpde & PG_RW) != 0) {
if (pmap_demote_pde(pmap, pde, va)) {
if ((oldpde & PG_W) == 0) {
/*
* Write protect the mapping to a
* single page so that a subsequent
* write access may repromote.
*/
va += VM_PAGE_TO_PHYS(m) - (oldpde &
PG_PS_FRAME);
pte = pmap_pde_to_pte(pde, va);
oldpte = *pte;
if ((oldpte & PG_V) != 0) {
while (!atomic_cmpset_long(pte,
oldpte,
oldpte & ~(PG_M | PG_RW)))
oldpte = *pte;
vm_page_dirty(m);
pmap_invalidate_page(pmap, va);
}
}
}
}
PMAP_UNLOCK(pmap);
}
small_mappings:
TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) {
pmap = PV_PMAP(pv);
PMAP_LOCK(pmap);
pde = pmap_pde(pmap, pv->pv_va);
KASSERT((*pde & PG_PS) == 0, ("pmap_clear_modify: found"
" a 2mpage in page %p's pv list", m));
pte = pmap_pde_to_pte(pde, pv->pv_va);
if ((*pte & (PG_M | PG_RW)) == (PG_M | PG_RW)) {
atomic_clear_long(pte, PG_M);
pmap_invalidate_page(pmap, pv->pv_va);
}
PMAP_UNLOCK(pmap);
}
rw_wunlock(&pvh_global_lock);
}
/*
* pmap_clear_reference:
*
* Clear the reference bit on the specified physical page.
*/
void
pmap_clear_reference(vm_page_t m)
{
struct md_page *pvh;
pmap_t pmap;
pv_entry_t next_pv, pv;
pd_entry_t oldpde, *pde;
pt_entry_t *pte;
vm_offset_t va;
KASSERT((m->oflags & VPO_UNMANAGED) == 0,
("pmap_clear_reference: page %p is not managed", m));
rw_wlock(&pvh_global_lock);
if ((m->flags & PG_FICTITIOUS) != 0)
goto small_mappings;
pvh = pa_to_pvh(VM_PAGE_TO_PHYS(m));
TAILQ_FOREACH_SAFE(pv, &pvh->pv_list, pv_list, next_pv) {
pmap = PV_PMAP(pv);
PMAP_LOCK(pmap);
va = pv->pv_va;
pde = pmap_pde(pmap, va);
oldpde = *pde;
if ((oldpde & PG_A) != 0) {
if (pmap_demote_pde(pmap, pde, va)) {
/*
* Remove the mapping to a single page so
* that a subsequent access may repromote.
* Since the underlying page table page is
* fully populated, this removal never frees
* a page table page.
*/
va += VM_PAGE_TO_PHYS(m) - (oldpde &
PG_PS_FRAME);
pmap_remove_page(pmap, va, pde, NULL);
}
}
PMAP_UNLOCK(pmap);
}
small_mappings:
TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) {
pmap = PV_PMAP(pv);
PMAP_LOCK(pmap);
pde = pmap_pde(pmap, pv->pv_va);
KASSERT((*pde & PG_PS) == 0, ("pmap_clear_reference: found"
" a 2mpage in page %p's pv list", m));
pte = pmap_pde_to_pte(pde, pv->pv_va);
if (*pte & PG_A) {
atomic_clear_long(pte, PG_A);
pmap_invalidate_page(pmap, pv->pv_va);
}
PMAP_UNLOCK(pmap);
}
rw_wunlock(&pvh_global_lock);
}
/*
* Miscellaneous support routines follow
*/
/* Adjust the cache mode for a 4KB page mapped via a PTE. */
static __inline void
pmap_pte_attr(pt_entry_t *pte, int cache_bits)
{
u_int opte, npte;
/*
* The cache mode bits are all in the low 32-bits of the
* PTE, so we can just spin on updating the low 32-bits.
*/
do {
opte = *(u_int *)pte;
npte = opte & ~PG_PTE_CACHE;
npte |= cache_bits;
} while (npte != opte && !atomic_cmpset_int((u_int *)pte, opte, npte));
}
/* Adjust the cache mode for a 2MB page mapped via a PDE. */
static __inline void
pmap_pde_attr(pd_entry_t *pde, int cache_bits)
{
u_int opde, npde;
/*
* The cache mode bits are all in the low 32-bits of the
* PDE, so we can just spin on updating the low 32-bits.
*/
do {
opde = *(u_int *)pde;
npde = opde & ~PG_PDE_CACHE;
npde |= cache_bits;
} while (npde != opde && !atomic_cmpset_int((u_int *)pde, opde, npde));
}
/*
* Map a set of physical memory pages into the kernel virtual
* address space. Return a pointer to where it is mapped. This
* routine is intended to be used for mapping device memory,
* NOT real memory.
*/
void *
pmap_mapdev_attr(vm_paddr_t pa, vm_size_t size, int mode)
{
vm_offset_t va, offset;
vm_size_t tmpsize;
/*
* If the specified range of physical addresses fits within the direct
* map window, use the direct map.
*/
if (pa < dmaplimit && pa + size < dmaplimit) {
va = PHYS_TO_DMAP(pa);
if (!pmap_change_attr(va, size, mode))
return ((void *)va);
}
offset = pa & PAGE_MASK;
size = roundup(offset + size, PAGE_SIZE);
va = kmem_alloc_nofault(kernel_map, size);
if (!va)
panic("pmap_mapdev: Couldn't alloc kernel virtual memory");
pa = trunc_page(pa);
for (tmpsize = 0; tmpsize < size; tmpsize += PAGE_SIZE)
pmap_kenter_attr(va + tmpsize, pa + tmpsize, mode);
pmap_invalidate_range(kernel_pmap, va, va + tmpsize);
pmap_invalidate_cache_range(va, va + tmpsize);
return ((void *)(va + offset));
}
void *
pmap_mapdev(vm_paddr_t pa, vm_size_t size)
{
return (pmap_mapdev_attr(pa, size, PAT_UNCACHEABLE));
}
void *
pmap_mapbios(vm_paddr_t pa, vm_size_t size)
{
return (pmap_mapdev_attr(pa, size, PAT_WRITE_BACK));
}
void
pmap_unmapdev(vm_offset_t va, vm_size_t size)
{
vm_offset_t base, offset, tmpva;
/* If we gave a direct map region in pmap_mapdev, do nothing */
if (va >= DMAP_MIN_ADDRESS && va < DMAP_MAX_ADDRESS)
return;
base = trunc_page(va);
offset = va & PAGE_MASK;
size = roundup(offset + size, PAGE_SIZE);
for (tmpva = base; tmpva < (base + size); tmpva += PAGE_SIZE)
pmap_kremove(tmpva);
pmap_invalidate_range(kernel_pmap, va, tmpva);
kmem_free(kernel_map, base, size);
}
/*
* Tries to demote a 1GB page mapping.
*/
static boolean_t
pmap_demote_pdpe(pmap_t pmap, pdp_entry_t *pdpe, vm_offset_t va)
{
pdp_entry_t newpdpe, oldpdpe;
pd_entry_t *firstpde, newpde, *pde;
vm_paddr_t mpdepa;
vm_page_t mpde;
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
oldpdpe = *pdpe;
KASSERT((oldpdpe & (PG_PS | PG_V)) == (PG_PS | PG_V),
("pmap_demote_pdpe: oldpdpe is missing PG_PS and/or PG_V"));
if ((mpde = vm_page_alloc(NULL, va >> PDPSHIFT, VM_ALLOC_INTERRUPT |
VM_ALLOC_NOOBJ | VM_ALLOC_WIRED)) == NULL) {
CTR2(KTR_PMAP, "pmap_demote_pdpe: failure for va %#lx"
" in pmap %p", va, pmap);
return (FALSE);
}
mpdepa = VM_PAGE_TO_PHYS(mpde);
firstpde = (pd_entry_t *)PHYS_TO_DMAP(mpdepa);
newpdpe = mpdepa | PG_M | PG_A | (oldpdpe & PG_U) | PG_RW | PG_V;
KASSERT((oldpdpe & PG_A) != 0,
("pmap_demote_pdpe: oldpdpe is missing PG_A"));
KASSERT((oldpdpe & (PG_M | PG_RW)) != PG_RW,
("pmap_demote_pdpe: oldpdpe is missing PG_M"));
newpde = oldpdpe;
/*
* Initialize the page directory page.
*/
for (pde = firstpde; pde < firstpde + NPDEPG; pde++) {
*pde = newpde;
newpde += NBPDR;
}
/*
* Demote the mapping.
*/
*pdpe = newpdpe;
/*
* Invalidate a stale recursive mapping of the page directory page.
*/
pmap_invalidate_page(pmap, (vm_offset_t)vtopde(va));
pmap_pdpe_demotions++;
CTR2(KTR_PMAP, "pmap_demote_pdpe: success for va %#lx"
" in pmap %p", va, pmap);
return (TRUE);
}
/*
* Sets the memory attribute for the specified page.
*/
void
pmap_page_set_memattr(vm_page_t m, vm_memattr_t ma)
{
m->md.pat_mode = ma;
/*
* If "m" is a normal page, update its direct mapping. This update
* can be relied upon to perform any cache operations that are
* required for data coherence.
*/
if ((m->flags & PG_FICTITIOUS) == 0 &&
pmap_change_attr(PHYS_TO_DMAP(VM_PAGE_TO_PHYS(m)), PAGE_SIZE,
m->md.pat_mode))
panic("memory attribute change on the direct map failed");
}
/*
* Changes the specified virtual address range's memory type to that given by
* the parameter "mode". The specified virtual address range must be
* completely contained within either the direct map or the kernel map. If
* the virtual address range is contained within the kernel map, then the
* memory type for each of the corresponding ranges of the direct map is also
* changed. (The corresponding ranges of the direct map are those ranges that
* map the same physical pages as the specified virtual address range.) These
* changes to the direct map are necessary because Intel describes the
* behavior of their processors as "undefined" if two or more mappings to the
* same physical page have different memory types.
*
* Returns zero if the change completed successfully, and either EINVAL or
* ENOMEM if the change failed. Specifically, EINVAL is returned if some part
* of the virtual address range was not mapped, and ENOMEM is returned if
* there was insufficient memory available to complete the change. In the
* latter case, the memory type may have been changed on some part of the
* virtual address range or the direct map.
*/
int
pmap_change_attr(vm_offset_t va, vm_size_t size, int mode)
{
int error;
PMAP_LOCK(kernel_pmap);
error = pmap_change_attr_locked(va, size, mode);
PMAP_UNLOCK(kernel_pmap);
return (error);
}
static int
pmap_change_attr_locked(vm_offset_t va, vm_size_t size, int mode)
{
vm_offset_t base, offset, tmpva;
vm_paddr_t pa_start, pa_end;
pdp_entry_t *pdpe;
pd_entry_t *pde;
pt_entry_t *pte;
int cache_bits_pte, cache_bits_pde, error;
boolean_t changed;
PMAP_LOCK_ASSERT(kernel_pmap, MA_OWNED);
base = trunc_page(va);
offset = va & PAGE_MASK;
size = roundup(offset + size, PAGE_SIZE);
/*
* Only supported on kernel virtual addresses, including the direct
* map but excluding the recursive map.
*/
if (base < DMAP_MIN_ADDRESS)
return (EINVAL);
cache_bits_pde = pmap_cache_bits(mode, 1);
cache_bits_pte = pmap_cache_bits(mode, 0);
changed = FALSE;
/*
* Pages that aren't mapped aren't supported. Also break down 2MB pages
* into 4KB pages if required.
*/
for (tmpva = base; tmpva < base + size; ) {
pdpe = pmap_pdpe(kernel_pmap, tmpva);
if (*pdpe == 0)
return (EINVAL);
if (*pdpe & PG_PS) {
/*
* If the current 1GB page already has the required
* memory type, then we need not demote this page. Just
* increment tmpva to the next 1GB page frame.
*/
if ((*pdpe & PG_PDE_CACHE) == cache_bits_pde) {
tmpva = trunc_1gpage(tmpva) + NBPDP;
continue;
}
/*
* If the current offset aligns with a 1GB page frame
* and there is at least 1GB left within the range, then
* we need not break down this page into 2MB pages.
*/
if ((tmpva & PDPMASK) == 0 &&
tmpva + PDPMASK < base + size) {
tmpva += NBPDP;
continue;
}
if (!pmap_demote_pdpe(kernel_pmap, pdpe, tmpva))
return (ENOMEM);
}
pde = pmap_pdpe_to_pde(pdpe, tmpva);
if (*pde == 0)
return (EINVAL);
if (*pde & PG_PS) {
/*
* If the current 2MB page already has the required
* memory type, then we need not demote this page. Just
* increment tmpva to the next 2MB page frame.
*/
if ((*pde & PG_PDE_CACHE) == cache_bits_pde) {
tmpva = trunc_2mpage(tmpva) + NBPDR;
continue;
}
/*
* If the current offset aligns with a 2MB page frame
* and there is at least 2MB left within the range, then
* we need not break down this page into 4KB pages.
*/
if ((tmpva & PDRMASK) == 0 &&
tmpva + PDRMASK < base + size) {
tmpva += NBPDR;
continue;
}
if (!pmap_demote_pde(kernel_pmap, pde, tmpva))
return (ENOMEM);
}
pte = pmap_pde_to_pte(pde, tmpva);
if (*pte == 0)
return (EINVAL);
tmpva += PAGE_SIZE;
}
error = 0;
/*
* Ok, all the pages exist, so run through them updating their
* cache mode if required.
*/
pa_start = pa_end = 0;
for (tmpva = base; tmpva < base + size; ) {
pdpe = pmap_pdpe(kernel_pmap, tmpva);
if (*pdpe & PG_PS) {
if ((*pdpe & PG_PDE_CACHE) != cache_bits_pde) {
pmap_pde_attr(pdpe, cache_bits_pde);
changed = TRUE;
}
if (tmpva >= VM_MIN_KERNEL_ADDRESS) {
if (pa_start == pa_end) {
/* Start physical address run. */
pa_start = *pdpe & PG_PS_FRAME;
pa_end = pa_start + NBPDP;
} else if (pa_end == (*pdpe & PG_PS_FRAME))
pa_end += NBPDP;
else {
/* Run ended, update direct map. */
error = pmap_change_attr_locked(
PHYS_TO_DMAP(pa_start),
pa_end - pa_start, mode);
if (error != 0)
break;
/* Start physical address run. */
pa_start = *pdpe & PG_PS_FRAME;
pa_end = pa_start + NBPDP;
}
}
tmpva = trunc_1gpage(tmpva) + NBPDP;
continue;
}
pde = pmap_pdpe_to_pde(pdpe, tmpva);
if (*pde & PG_PS) {
if ((*pde & PG_PDE_CACHE) != cache_bits_pde) {
pmap_pde_attr(pde, cache_bits_pde);
changed = TRUE;
}
if (tmpva >= VM_MIN_KERNEL_ADDRESS) {
if (pa_start == pa_end) {
/* Start physical address run. */
pa_start = *pde & PG_PS_FRAME;
pa_end = pa_start + NBPDR;
} else if (pa_end == (*pde & PG_PS_FRAME))
pa_end += NBPDR;
else {
/* Run ended, update direct map. */
error = pmap_change_attr_locked(
PHYS_TO_DMAP(pa_start),
pa_end - pa_start, mode);
if (error != 0)
break;
/* Start physical address run. */
pa_start = *pde & PG_PS_FRAME;
pa_end = pa_start + NBPDR;
}
}
tmpva = trunc_2mpage(tmpva) + NBPDR;
} else {
pte = pmap_pde_to_pte(pde, tmpva);
if ((*pte & PG_PTE_CACHE) != cache_bits_pte) {
pmap_pte_attr(pte, cache_bits_pte);
changed = TRUE;
}
if (tmpva >= VM_MIN_KERNEL_ADDRESS) {
if (pa_start == pa_end) {
/* Start physical address run. */
pa_start = *pte & PG_FRAME;
pa_end = pa_start + PAGE_SIZE;
} else if (pa_end == (*pte & PG_FRAME))
pa_end += PAGE_SIZE;
else {
/* Run ended, update direct map. */
error = pmap_change_attr_locked(
PHYS_TO_DMAP(pa_start),
pa_end - pa_start, mode);
if (error != 0)
break;
/* Start physical address run. */
pa_start = *pte & PG_FRAME;
pa_end = pa_start + PAGE_SIZE;
}
}
tmpva += PAGE_SIZE;
}
}
if (error == 0 && pa_start != pa_end)
error = pmap_change_attr_locked(PHYS_TO_DMAP(pa_start),
pa_end - pa_start, mode);
/*
* Flush CPU caches if required to make sure any data isn't cached that
* shouldn't be, etc.
*/
if (changed) {
pmap_invalidate_range(kernel_pmap, base, tmpva);
pmap_invalidate_cache_range(base, tmpva);
}
return (error);
}
/*
* Demotes any mapping within the direct map region that covers more than the
* specified range of physical addresses. This range's size must be a power
* of two and its starting address must be a multiple of its size. Since the
* demotion does not change any attributes of the mapping, a TLB invalidation
* is not mandatory. The caller may, however, request a TLB invalidation.
*/
void
pmap_demote_DMAP(vm_paddr_t base, vm_size_t len, boolean_t invalidate)
{
pdp_entry_t *pdpe;
pd_entry_t *pde;
vm_offset_t va;
boolean_t changed;
if (len == 0)
return;
KASSERT(powerof2(len), ("pmap_demote_DMAP: len is not a power of 2"));
KASSERT((base & (len - 1)) == 0,
("pmap_demote_DMAP: base is not a multiple of len"));
if (len < NBPDP && base < dmaplimit) {
va = PHYS_TO_DMAP(base);
changed = FALSE;
PMAP_LOCK(kernel_pmap);
pdpe = pmap_pdpe(kernel_pmap, va);
if ((*pdpe & PG_V) == 0)
panic("pmap_demote_DMAP: invalid PDPE");
if ((*pdpe & PG_PS) != 0) {
if (!pmap_demote_pdpe(kernel_pmap, pdpe, va))
panic("pmap_demote_DMAP: PDPE failed");
changed = TRUE;
}
if (len < NBPDR) {
pde = pmap_pdpe_to_pde(pdpe, va);
if ((*pde & PG_V) == 0)
panic("pmap_demote_DMAP: invalid PDE");
if ((*pde & PG_PS) != 0) {
if (!pmap_demote_pde(kernel_pmap, pde, va))
panic("pmap_demote_DMAP: PDE failed");
changed = TRUE;
}
}
if (changed && invalidate)
pmap_invalidate_page(kernel_pmap, va);
PMAP_UNLOCK(kernel_pmap);
}
}
/*
* perform the pmap work for mincore
*/
int
pmap_mincore(pmap_t pmap, vm_offset_t addr, vm_paddr_t *locked_pa)
{
pd_entry_t *pdep;
pt_entry_t pte;
vm_paddr_t pa;
int val;
PMAP_LOCK(pmap);
retry:
pdep = pmap_pde(pmap, addr);
if (pdep != NULL && (*pdep & PG_V)) {
if (*pdep & PG_PS) {
pte = *pdep;
/* Compute the physical address of the 4KB page. */
pa = ((*pdep & PG_PS_FRAME) | (addr & PDRMASK)) &
PG_FRAME;
val = MINCORE_SUPER;
} else {
pte = *pmap_pde_to_pte(pdep, addr);
pa = pte & PG_FRAME;
val = 0;
}
} else {
pte = 0;
pa = 0;
val = 0;
}
if ((pte & PG_V) != 0) {
val |= MINCORE_INCORE;
if ((pte & (PG_M | PG_RW)) == (PG_M | PG_RW))
val |= MINCORE_MODIFIED | MINCORE_MODIFIED_OTHER;
if ((pte & PG_A) != 0)
val |= MINCORE_REFERENCED | MINCORE_REFERENCED_OTHER;
}
if ((val & (MINCORE_MODIFIED_OTHER | MINCORE_REFERENCED_OTHER)) !=
(MINCORE_MODIFIED_OTHER | MINCORE_REFERENCED_OTHER) &&
(pte & (PG_MANAGED | PG_V)) == (PG_MANAGED | PG_V)) {
/* Ensure that "PHYS_TO_VM_PAGE(pa)->object" doesn't change. */
if (vm_page_pa_tryrelock(pmap, pa, locked_pa))
goto retry;
} else
PA_UNLOCK_COND(*locked_pa);
PMAP_UNLOCK(pmap);
return (val);
}
void
pmap_activate(struct thread *td)
{
pmap_t pmap, oldpmap;
u_int cpuid;
u_int64_t cr3;
critical_enter();
pmap = vmspace_pmap(td->td_proc->p_vmspace);
oldpmap = PCPU_GET(curpmap);
cpuid = PCPU_GET(cpuid);
#ifdef SMP
CPU_CLR_ATOMIC(cpuid, &oldpmap->pm_active);
CPU_SET_ATOMIC(cpuid, &pmap->pm_active);
#else
CPU_CLR(cpuid, &oldpmap->pm_active);
CPU_SET(cpuid, &pmap->pm_active);
#endif
cr3 = DMAP_TO_PHYS((vm_offset_t)pmap->pm_pml4);
td->td_pcb->pcb_cr3 = cr3;
load_cr3(cr3);
PCPU_SET(curpmap, pmap);
critical_exit();
}
void
pmap_sync_icache(pmap_t pm, vm_offset_t va, vm_size_t sz)
{
}
/*
* Increase the starting virtual address of the given mapping if a
* different alignment might result in more superpage mappings.
*/
void
pmap_align_superpage(vm_object_t object, vm_ooffset_t offset,
vm_offset_t *addr, vm_size_t size)
{
vm_offset_t superpage_offset;
if (size < NBPDR)
return;
if (object != NULL && (object->flags & OBJ_COLORED) != 0)
offset += ptoa(object->pg_color);
superpage_offset = offset & PDRMASK;
if (size - ((NBPDR - superpage_offset) & PDRMASK) < NBPDR ||
(*addr & PDRMASK) == superpage_offset)
return;
if ((*addr & PDRMASK) < superpage_offset)
*addr = (*addr & ~PDRMASK) + superpage_offset;
else
*addr = ((*addr + PDRMASK) & ~PDRMASK) + superpage_offset;
}