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| Current File : //sys/mips/mips/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.
*
* 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.
* 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
* from: src/sys/i386/i386/pmap.c,v 1.250.2.8 2000/11/21 00:09:14 ps
* JNPR: pmap.c,v 1.11.2.1 2007/08/16 11:51:06 girish
*/
/*
* 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 <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/mips/mips/pmap.c 225418 2011-09-06 10:30:11Z kib $");
#include "opt_ddb.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/msgbuf.h>
#include <sys/vmmeter.h>
#include <sys/mman.h>
#include <sys/smp.h>
#ifdef DDB
#include <ddb/ddb.h>
#endif
#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_phys.h>
#include <sys/lock.h>
#include <sys/mutex.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/uma.h>
#include <sys/pcpu.h>
#include <sys/sched.h>
#ifdef SMP
#include <sys/smp.h>
#endif
#include <machine/cache.h>
#include <machine/md_var.h>
#include <machine/tlb.h>
#undef PMAP_DEBUG
#ifndef PMAP_SHPGPERPROC
#define PMAP_SHPGPERPROC 200
#endif
#if !defined(DIAGNOSTIC)
#define PMAP_INLINE __inline
#else
#define PMAP_INLINE
#endif
/*
* Get PDEs and PTEs for user/kernel address space
*/
#define pmap_seg_index(v) (((v) >> SEGSHIFT) & (NPDEPG - 1))
#define pmap_pde_index(v) (((v) >> PDRSHIFT) & (NPDEPG - 1))
#define pmap_pte_index(v) (((v) >> PAGE_SHIFT) & (NPTEPG - 1))
#define pmap_pde_pindex(v) ((v) >> PDRSHIFT)
#ifdef __mips_n64
#define NUPDE (NPDEPG * NPDEPG)
#define NUSERPGTBLS (NUPDE + NPDEPG)
#else
#define NUPDE (NPDEPG)
#define NUSERPGTBLS (NUPDE)
#endif
#define is_kernel_pmap(x) ((x) == kernel_pmap)
struct pmap kernel_pmap_store;
pd_entry_t *kernel_segmap;
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 nkpt;
unsigned pmap_max_asid; /* max ASID supported by the system */
#define PMAP_ASID_RESERVED 0
vm_offset_t kernel_vm_end = VM_MIN_KERNEL_ADDRESS;
static void pmap_asid_alloc(pmap_t pmap);
/*
* Data for the pv entry allocation mechanism
*/
static uma_zone_t pvzone;
static struct vm_object pvzone_obj;
static int pv_entry_count = 0, pv_entry_max = 0, pv_entry_high_water = 0;
static PMAP_INLINE void free_pv_entry(pv_entry_t pv);
static pv_entry_t get_pv_entry(pmap_t locked_pmap);
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 __inline void pmap_changebit(vm_page_t m, int bit, boolean_t setem);
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 int pmap_remove_pte(struct pmap *pmap, pt_entry_t *ptq, vm_offset_t va);
static void pmap_remove_page(struct pmap *pmap, vm_offset_t va);
static void pmap_remove_entry(struct pmap *pmap, vm_page_t m, vm_offset_t va);
static boolean_t pmap_try_insert_pv_entry(pmap_t pmap, vm_page_t mpte,
vm_offset_t va, vm_page_t m);
static void pmap_update_page(pmap_t pmap, vm_offset_t va, pt_entry_t pte);
static void pmap_invalidate_all(pmap_t pmap);
static void pmap_invalidate_page(pmap_t pmap, vm_offset_t va);
static int _pmap_unwire_pte_hold(pmap_t pmap, vm_offset_t va, vm_page_t m);
static vm_page_t pmap_allocpte(pmap_t pmap, vm_offset_t va, int flags);
static vm_page_t _pmap_allocpte(pmap_t pmap, unsigned ptepindex, int flags);
static int pmap_unuse_pt(pmap_t, vm_offset_t, vm_page_t);
static pt_entry_t init_pte_prot(vm_offset_t va, vm_page_t m, vm_prot_t prot);
#ifdef SMP
static void pmap_invalidate_page_action(void *arg);
static void pmap_invalidate_all_action(void *arg);
static void pmap_update_page_action(void *arg);
#endif
#ifndef __mips_n64
/*
* This structure is for high memory (memory above 512Meg in 32 bit) support.
* The highmem area does not have a KSEG0 mapping, and we need a mechanism to
* do temporary per-CPU mappings for pmap_zero_page, pmap_copy_page etc.
*
* At bootup, we reserve 2 virtual pages per CPU for mapping highmem pages. To
* access a highmem physical address on a CPU, we map the physical address to
* the reserved virtual address for the CPU in the kernel pagetable. This is
* done with interrupts disabled(although a spinlock and sched_pin would be
* sufficient).
*/
struct local_sysmaps {
vm_offset_t base;
uint32_t saved_intr;
uint16_t valid1, valid2;
};
static struct local_sysmaps sysmap_lmem[MAXCPU];
static __inline void
pmap_alloc_lmem_map(void)
{
int i;
for (i = 0; i < MAXCPU; i++) {
sysmap_lmem[i].base = virtual_avail;
virtual_avail += PAGE_SIZE * 2;
sysmap_lmem[i].valid1 = sysmap_lmem[i].valid2 = 0;
}
}
static __inline vm_offset_t
pmap_lmem_map1(vm_paddr_t phys)
{
struct local_sysmaps *sysm;
pt_entry_t *pte, npte;
vm_offset_t va;
uint32_t intr;
int cpu;
intr = intr_disable();
cpu = PCPU_GET(cpuid);
sysm = &sysmap_lmem[cpu];
sysm->saved_intr = intr;
va = sysm->base;
npte = TLBLO_PA_TO_PFN(phys) |
PTE_D | PTE_V | PTE_G | PTE_W | PTE_C_CACHE;
pte = pmap_pte(kernel_pmap, va);
*pte = npte;
sysm->valid1 = 1;
return (va);
}
static __inline vm_offset_t
pmap_lmem_map2(vm_paddr_t phys1, vm_paddr_t phys2)
{
struct local_sysmaps *sysm;
pt_entry_t *pte, npte;
vm_offset_t va1, va2;
uint32_t intr;
int cpu;
intr = intr_disable();
cpu = PCPU_GET(cpuid);
sysm = &sysmap_lmem[cpu];
sysm->saved_intr = intr;
va1 = sysm->base;
va2 = sysm->base + PAGE_SIZE;
npte = TLBLO_PA_TO_PFN(phys1) |
PTE_D | PTE_V | PTE_G | PTE_W | PTE_C_CACHE;
pte = pmap_pte(kernel_pmap, va1);
*pte = npte;
npte = TLBLO_PA_TO_PFN(phys2) |
PTE_D | PTE_V | PTE_G | PTE_W | PTE_C_CACHE;
pte = pmap_pte(kernel_pmap, va2);
*pte = npte;
sysm->valid1 = 1;
sysm->valid2 = 1;
return (va1);
}
static __inline void
pmap_lmem_unmap(void)
{
struct local_sysmaps *sysm;
pt_entry_t *pte;
int cpu;
cpu = PCPU_GET(cpuid);
sysm = &sysmap_lmem[cpu];
pte = pmap_pte(kernel_pmap, sysm->base);
*pte = PTE_G;
tlb_invalidate_address(kernel_pmap, sysm->base);
sysm->valid1 = 0;
if (sysm->valid2) {
pte = pmap_pte(kernel_pmap, sysm->base + PAGE_SIZE);
*pte = PTE_G;
tlb_invalidate_address(kernel_pmap, sysm->base + PAGE_SIZE);
sysm->valid2 = 0;
}
intr_restore(sysm->saved_intr);
}
#else /* __mips_n64 */
static __inline void
pmap_alloc_lmem_map(void)
{
}
static __inline vm_offset_t
pmap_lmem_map1(vm_paddr_t phys)
{
return (0);
}
static __inline vm_offset_t
pmap_lmem_map2(vm_paddr_t phys1, vm_paddr_t phys2)
{
return (0);
}
static __inline vm_offset_t
pmap_lmem_unmap(void)
{
return (0);
}
#endif /* !__mips_n64 */
/*
* Page table entry lookup routines.
*/
static __inline pd_entry_t *
pmap_segmap(pmap_t pmap, vm_offset_t va)
{
return (&pmap->pm_segtab[pmap_seg_index(va)]);
}
#ifdef __mips_n64
static __inline pd_entry_t *
pmap_pdpe_to_pde(pd_entry_t *pdpe, vm_offset_t va)
{
pd_entry_t *pde;
pde = (pd_entry_t *)*pdpe;
return (&pde[pmap_pde_index(va)]);
}
static __inline pd_entry_t *
pmap_pde(pmap_t pmap, vm_offset_t va)
{
pd_entry_t *pdpe;
pdpe = pmap_segmap(pmap, va);
if (pdpe == NULL || *pdpe == NULL)
return (NULL);
return (pmap_pdpe_to_pde(pdpe, va));
}
#else
static __inline pd_entry_t *
pmap_pdpe_to_pde(pd_entry_t *pdpe, vm_offset_t va)
{
return (pdpe);
}
static __inline
pd_entry_t *pmap_pde(pmap_t pmap, vm_offset_t va)
{
return (pmap_segmap(pmap, va));
}
#endif
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 *)*pde;
return (&pte[pmap_pte_index(va)]);
}
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 == NULL)
return (NULL);
return (pmap_pde_to_pte(pde, va));
}
vm_offset_t
pmap_steal_memory(vm_size_t size)
{
vm_paddr_t bank_size, pa;
vm_offset_t va;
size = round_page(size);
bank_size = phys_avail[1] - phys_avail[0];
while (size > bank_size) {
int i;
for (i = 0; phys_avail[i + 2]; i += 2) {
phys_avail[i] = phys_avail[i + 2];
phys_avail[i + 1] = phys_avail[i + 3];
}
phys_avail[i] = 0;
phys_avail[i + 1] = 0;
if (!phys_avail[0])
panic("pmap_steal_memory: out of memory");
bank_size = phys_avail[1] - phys_avail[0];
}
pa = phys_avail[0];
phys_avail[0] += size;
if (MIPS_DIRECT_MAPPABLE(pa) == 0)
panic("Out of memory below 512Meg?");
va = MIPS_PHYS_TO_DIRECT(pa);
bzero((caddr_t)va, size);
return (va);
}
/*
* Bootstrap the system enough to run with virtual memory. This
* assumes that the phys_avail array has been initialized.
*/
static void
pmap_create_kernel_pagetable(void)
{
int i, j;
vm_offset_t ptaddr;
pt_entry_t *pte;
#ifdef __mips_n64
pd_entry_t *pde;
vm_offset_t pdaddr;
int npt, npde;
#endif
/*
* Allocate segment table for the kernel
*/
kernel_segmap = (pd_entry_t *)pmap_steal_memory(PAGE_SIZE);
/*
* Allocate second level page tables for the kernel
*/
#ifdef __mips_n64
npde = howmany(NKPT, NPDEPG);
pdaddr = pmap_steal_memory(PAGE_SIZE * npde);
#endif
nkpt = NKPT;
ptaddr = pmap_steal_memory(PAGE_SIZE * nkpt);
/*
* The R[4-7]?00 stores only one copy of the Global bit in the
* translation lookaside buffer for each 2 page entry. Thus invalid
* entrys must have the Global bit set so when Entry LO and Entry HI
* G bits are anded together they will produce a global bit to store
* in the tlb.
*/
for (i = 0, pte = (pt_entry_t *)ptaddr; i < (nkpt * NPTEPG); i++, pte++)
*pte = PTE_G;
#ifdef __mips_n64
for (i = 0, npt = nkpt; npt > 0; i++) {
kernel_segmap[i] = (pd_entry_t)(pdaddr + i * PAGE_SIZE);
pde = (pd_entry_t *)kernel_segmap[i];
for (j = 0; j < NPDEPG && npt > 0; j++, npt--)
pde[j] = (pd_entry_t)(ptaddr + (i * NPDEPG + j) * PAGE_SIZE);
}
#else
for (i = 0, j = pmap_seg_index(VM_MIN_KERNEL_ADDRESS); i < nkpt; i++, j++)
kernel_segmap[j] = (pd_entry_t)(ptaddr + (i * PAGE_SIZE));
#endif
PMAP_LOCK_INIT(kernel_pmap);
kernel_pmap->pm_segtab = kernel_segmap;
CPU_FILL(&kernel_pmap->pm_active);
TAILQ_INIT(&kernel_pmap->pm_pvlist);
kernel_pmap->pm_asid[0].asid = PMAP_ASID_RESERVED;
kernel_pmap->pm_asid[0].gen = 0;
kernel_vm_end += nkpt * NPTEPG * PAGE_SIZE;
}
void
pmap_bootstrap(void)
{
int i;
int need_local_mappings = 0;
/* Sort. */
again:
for (i = 0; phys_avail[i + 1] != 0; i += 2) {
/*
* Keep the memory aligned on page boundary.
*/
phys_avail[i] = round_page(phys_avail[i]);
phys_avail[i + 1] = trunc_page(phys_avail[i + 1]);
if (i < 2)
continue;
if (phys_avail[i - 2] > phys_avail[i]) {
vm_paddr_t ptemp[2];
ptemp[0] = phys_avail[i + 0];
ptemp[1] = phys_avail[i + 1];
phys_avail[i + 0] = phys_avail[i - 2];
phys_avail[i + 1] = phys_avail[i - 1];
phys_avail[i - 2] = ptemp[0];
phys_avail[i - 1] = ptemp[1];
goto again;
}
}
/*
* In 32 bit, we may have memory which cannot be mapped directly.
* This memory will need temporary mapping before it can be
* accessed.
*/
if (!MIPS_DIRECT_MAPPABLE(phys_avail[i - 1] - 1))
need_local_mappings = 1;
/*
* Copy the phys_avail[] array before we start stealing memory from it.
*/
for (i = 0; phys_avail[i + 1] != 0; i += 2) {
physmem_desc[i] = phys_avail[i];
physmem_desc[i + 1] = phys_avail[i + 1];
}
Maxmem = atop(phys_avail[i - 1]);
if (bootverbose) {
printf("Physical memory chunk(s):\n");
for (i = 0; phys_avail[i + 1] != 0; i += 2) {
vm_paddr_t size;
size = phys_avail[i + 1] - phys_avail[i];
printf("%#08jx - %#08jx, %ju bytes (%ju pages)\n",
(uintmax_t) phys_avail[i],
(uintmax_t) phys_avail[i + 1] - 1,
(uintmax_t) size, (uintmax_t) size / PAGE_SIZE);
}
printf("Maxmem is 0x%0jx\n", ptoa((uintmax_t)Maxmem));
}
/*
* Steal the message buffer from the beginning of memory.
*/
msgbufp = (struct msgbuf *)pmap_steal_memory(msgbufsize);
msgbufinit(msgbufp, msgbufsize);
/*
* Steal thread0 kstack.
*/
kstack0 = pmap_steal_memory(KSTACK_PAGES << PAGE_SHIFT);
virtual_avail = VM_MIN_KERNEL_ADDRESS;
virtual_end = VM_MAX_KERNEL_ADDRESS;
#ifdef SMP
/*
* Steal some virtual address space to map the pcpu area.
*/
virtual_avail = roundup2(virtual_avail, PAGE_SIZE * 2);
pcpup = (struct pcpu *)virtual_avail;
virtual_avail += PAGE_SIZE * 2;
/*
* Initialize the wired TLB entry mapping the pcpu region for
* the BSP at 'pcpup'. Up until this point we were operating
* with the 'pcpup' for the BSP pointing to a virtual address
* in KSEG0 so there was no need for a TLB mapping.
*/
mips_pcpu_tlb_init(PCPU_ADDR(0));
if (bootverbose)
printf("pcpu is available at virtual address %p.\n", pcpup);
#endif
if (need_local_mappings)
pmap_alloc_lmem_map();
pmap_create_kernel_pagetable();
pmap_max_asid = VMNUM_PIDS;
mips_wr_entryhi(0);
mips_wr_pagemask(0);
}
/*
* Initialize a vm_page's machine-dependent fields.
*/
void
pmap_page_init(vm_page_t m)
{
TAILQ_INIT(&m->md.pv_list);
m->md.pv_list_count = 0;
m->md.pv_flags = 0;
}
/*
* Initialize the pmap module.
* Called by vm_init, to initialize any structures that the pmap
* system needs to map virtual memory.
* pmap_init has been enhanced to support in a fairly consistant
* way, discontiguous physical memory.
*/
void
pmap_init(void)
{
/*
* Initialize the address space (zone) for the pv entries. Set a
* high water mark so that the system can recover from excessive
* numbers of pv entries.
*/
pvzone = uma_zcreate("PV ENTRY", sizeof(struct pv_entry), NULL, NULL,
NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_VM | UMA_ZONE_NOFREE);
pv_entry_max = PMAP_SHPGPERPROC * maxproc + cnt.v_page_count;
pv_entry_high_water = 9 * (pv_entry_max / 10);
uma_zone_set_obj(pvzone, &pvzone_obj, pv_entry_max);
}
/***************************************************
* Low level helper routines.....
***************************************************/
static __inline void
pmap_invalidate_all_local(pmap_t pmap)
{
u_int cpuid;
cpuid = PCPU_GET(cpuid);
if (pmap == kernel_pmap) {
tlb_invalidate_all();
return;
}
if (CPU_ISSET(cpuid, &pmap->pm_active))
tlb_invalidate_all_user(pmap);
else
pmap->pm_asid[cpuid].gen = 0;
}
#ifdef SMP
static void
pmap_invalidate_all(pmap_t pmap)
{
smp_rendezvous(0, pmap_invalidate_all_action, 0, pmap);
}
static void
pmap_invalidate_all_action(void *arg)
{
pmap_invalidate_all_local((pmap_t)arg);
}
#else
static void
pmap_invalidate_all(pmap_t pmap)
{
pmap_invalidate_all_local(pmap);
}
#endif
static __inline void
pmap_invalidate_page_local(pmap_t pmap, vm_offset_t va)
{
u_int cpuid;
cpuid = PCPU_GET(cpuid);
if (is_kernel_pmap(pmap)) {
tlb_invalidate_address(pmap, va);
return;
}
if (pmap->pm_asid[cpuid].gen != PCPU_GET(asid_generation))
return;
else if (!CPU_ISSET(cpuid, &pmap->pm_active)) {
pmap->pm_asid[cpuid].gen = 0;
return;
}
tlb_invalidate_address(pmap, va);
}
#ifdef SMP
struct pmap_invalidate_page_arg {
pmap_t pmap;
vm_offset_t va;
};
static void
pmap_invalidate_page(pmap_t pmap, vm_offset_t va)
{
struct pmap_invalidate_page_arg arg;
arg.pmap = pmap;
arg.va = va;
smp_rendezvous(0, pmap_invalidate_page_action, 0, &arg);
}
static void
pmap_invalidate_page_action(void *arg)
{
struct pmap_invalidate_page_arg *p = arg;
pmap_invalidate_page_local(p->pmap, p->va);
}
#else
static void
pmap_invalidate_page(pmap_t pmap, vm_offset_t va)
{
pmap_invalidate_page_local(pmap, va);
}
#endif
static __inline void
pmap_update_page_local(pmap_t pmap, vm_offset_t va, pt_entry_t pte)
{
u_int cpuid;
cpuid = PCPU_GET(cpuid);
if (is_kernel_pmap(pmap)) {
tlb_update(pmap, va, pte);
return;
}
if (pmap->pm_asid[cpuid].gen != PCPU_GET(asid_generation))
return;
else if (!CPU_ISSET(cpuid, &pmap->pm_active)) {
pmap->pm_asid[cpuid].gen = 0;
return;
}
tlb_update(pmap, va, pte);
}
#ifdef SMP
struct pmap_update_page_arg {
pmap_t pmap;
vm_offset_t va;
pt_entry_t pte;
};
static void
pmap_update_page(pmap_t pmap, vm_offset_t va, pt_entry_t pte)
{
struct pmap_update_page_arg arg;
arg.pmap = pmap;
arg.va = va;
arg.pte = pte;
smp_rendezvous(0, pmap_update_page_action, 0, &arg);
}
static void
pmap_update_page_action(void *arg)
{
struct pmap_update_page_arg *p = arg;
pmap_update_page_local(p->pmap, p->va, p->pte);
}
#else
static void
pmap_update_page(pmap_t pmap, vm_offset_t va, pt_entry_t pte)
{
pmap_update_page_local(pmap, va, pte);
}
#endif
/*
* 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)
{
pt_entry_t *pte;
vm_offset_t retval = 0;
PMAP_LOCK(pmap);
pte = pmap_pte(pmap, va);
if (pte) {
retval = TLBLO_PTE_TO_PA(*pte) | (va & PAGE_MASK);
}
PMAP_UNLOCK(pmap);
return (retval);
}
/*
* 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)
{
pt_entry_t pte;
vm_page_t m;
vm_paddr_t pa;
m = NULL;
pa = 0;
PMAP_LOCK(pmap);
retry:
pte = *pmap_pte(pmap, va);
if (pte != 0 && pte_test(&pte, PTE_V) &&
(pte_test(&pte, PTE_D) || (prot & VM_PROT_WRITE) == 0)) {
if (vm_page_pa_tryrelock(pmap, TLBLO_PTE_TO_PA(pte), &pa))
goto retry;
m = PHYS_TO_VM_PAGE(TLBLO_PTE_TO_PA(pte));
vm_page_hold(m);
}
PA_UNLOCK_COND(pa);
PMAP_UNLOCK(pmap);
return (m);
}
/***************************************************
* Low level mapping routines.....
***************************************************/
/*
* add a wired page to the kva
*/
void
pmap_kenter_attr(vm_offset_t va, vm_paddr_t pa, int attr)
{
pt_entry_t *pte;
pt_entry_t opte, npte;
#ifdef PMAP_DEBUG
printf("pmap_kenter: va: %p -> pa: %p\n", (void *)va, (void *)pa);
#endif
npte = TLBLO_PA_TO_PFN(pa) | PTE_D | PTE_V | PTE_G | PTE_W | attr;
pte = pmap_pte(kernel_pmap, va);
opte = *pte;
*pte = npte;
if (pte_test(&opte, PTE_V) && opte != npte)
pmap_update_page(kernel_pmap, va, npte);
}
void
pmap_kenter(vm_offset_t va, vm_paddr_t pa)
{
KASSERT(is_cacheable_mem(pa),
("pmap_kenter: memory at 0x%lx is not cacheable", (u_long)pa));
pmap_kenter_attr(va, pa, PTE_C_CACHE);
}
/*
* remove a page from the kernel pagetables
*/
/* PMAP_INLINE */ void
pmap_kremove(vm_offset_t va)
{
pt_entry_t *pte;
/*
* Write back all caches from the page being destroyed
*/
mips_dcache_wbinv_range_index(va, PAGE_SIZE);
pte = pmap_pte(kernel_pmap, va);
*pte = PTE_G;
pmap_invalidate_page(kernel_pmap, va);
}
/*
* 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.
*
* Use XKPHYS for 64 bit, and KSEG0 where possible for 32 bit.
*/
vm_offset_t
pmap_map(vm_offset_t *virt, vm_paddr_t start, vm_paddr_t end, int prot)
{
vm_offset_t va, sva;
if (MIPS_DIRECT_MAPPABLE(end - 1))
return (MIPS_PHYS_TO_DIRECT(start));
va = sva = *virt;
while (start < end) {
pmap_kenter(va, start);
va += PAGE_SIZE;
start += PAGE_SIZE;
}
*virt = va;
return (sva);
}
/*
* 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.
*/
void
pmap_qenter(vm_offset_t va, vm_page_t *m, int count)
{
int i;
vm_offset_t origva = va;
for (i = 0; i < count; i++) {
pmap_flush_pvcache(m[i]);
pmap_kenter(va, VM_PAGE_TO_PHYS(m[i]));
va += PAGE_SIZE;
}
mips_dcache_wbinv_range_index(origva, PAGE_SIZE*count);
}
/*
* this routine jerks page mappings from the
* kernel -- it is meant only for temporary mappings.
*/
void
pmap_qremove(vm_offset_t va, int count)
{
/*
* No need to wb/inv caches here,
* pmap_kremove will do it for us
*/
while (count-- > 0) {
pmap_kremove(va);
va += PAGE_SIZE;
}
}
/***************************************************
* Page table page management routines.....
***************************************************/
/* Revision 1.507
*
* Simplify the reference counting of page table pages. Specifically, use
* the page table page's wired count rather than its hold count to contain
* the reference count.
*/
/*
* This routine unholds page table pages, and if the hold count
* drops to zero, then it decrements the wire count.
*/
static PMAP_INLINE int
pmap_unwire_pte_hold(pmap_t pmap, vm_offset_t va, vm_page_t m)
{
--m->wire_count;
if (m->wire_count == 0)
return (_pmap_unwire_pte_hold(pmap, va, m));
else
return (0);
}
static int
_pmap_unwire_pte_hold(pmap_t pmap, vm_offset_t va, vm_page_t m)
{
pd_entry_t *pde;
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
/*
* unmap the page table page
*/
#ifdef __mips_n64
if (m->pindex < NUPDE)
pde = pmap_pde(pmap, va);
else
pde = pmap_segmap(pmap, va);
#else
pde = pmap_pde(pmap, va);
#endif
*pde = 0;
pmap->pm_stats.resident_count--;
#ifdef __mips_n64
if (m->pindex < NUPDE) {
pd_entry_t *pdp;
vm_page_t pdpg;
/*
* Recursively decrement next level pagetable refcount
*/
pdp = (pd_entry_t *)*pmap_segmap(pmap, va);
pdpg = PHYS_TO_VM_PAGE(MIPS_DIRECT_TO_PHYS(pdp));
pmap_unwire_pte_hold(pmap, va, pdpg);
}
#endif
if (pmap->pm_ptphint == m)
pmap->pm_ptphint = NULL;
/*
* If the page is finally unwired, simply free it.
*/
vm_page_free_zero(m);
atomic_subtract_int(&cnt.v_wire_count, 1);
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, vm_page_t mpte)
{
unsigned ptepindex;
pd_entry_t pteva;
if (va >= VM_MAXUSER_ADDRESS)
return (0);
if (mpte == NULL) {
ptepindex = pmap_pde_pindex(va);
if (pmap->pm_ptphint &&
(pmap->pm_ptphint->pindex == ptepindex)) {
mpte = pmap->pm_ptphint;
} else {
pteva = *pmap_pde(pmap, va);
mpte = PHYS_TO_VM_PAGE(MIPS_DIRECT_TO_PHYS(pteva));
pmap->pm_ptphint = mpte;
}
}
return (pmap_unwire_pte_hold(pmap, va, mpte));
}
void
pmap_pinit0(pmap_t pmap)
{
int i;
PMAP_LOCK_INIT(pmap);
pmap->pm_segtab = kernel_segmap;
CPU_ZERO(&pmap->pm_active);
pmap->pm_ptphint = NULL;
for (i = 0; i < MAXCPU; i++) {
pmap->pm_asid[i].asid = PMAP_ASID_RESERVED;
pmap->pm_asid[i].gen = 0;
}
PCPU_SET(curpmap, pmap);
TAILQ_INIT(&pmap->pm_pvlist);
bzero(&pmap->pm_stats, sizeof pmap->pm_stats);
}
void
pmap_grow_direct_page_cache()
{
#ifdef __mips_n64
vm_contig_grow_cache(3, 0, MIPS_XKPHYS_LARGEST_PHYS);
#else
vm_contig_grow_cache(3, 0, MIPS_KSEG0_LARGEST_PHYS);
#endif
}
vm_page_t
pmap_alloc_direct_page(unsigned int index, int req)
{
vm_page_t m;
m = vm_page_alloc_freelist(VM_FREELIST_DIRECT, req);
if (m == NULL)
return (NULL);
if ((m->flags & PG_ZERO) == 0)
pmap_zero_page(m);
m->pindex = index;
atomic_add_int(&cnt.v_wire_count, 1);
m->wire_count = 1;
return (m);
}
/*
* Initialize a preallocated and zeroed pmap structure,
* such as one in a vmspace structure.
*/
int
pmap_pinit(pmap_t pmap)
{
vm_offset_t ptdva;
vm_page_t ptdpg;
int i;
PMAP_LOCK_INIT(pmap);
/*
* allocate the page directory page
*/
while ((ptdpg = pmap_alloc_direct_page(NUSERPGTBLS, VM_ALLOC_NORMAL)) == NULL)
pmap_grow_direct_page_cache();
ptdva = MIPS_PHYS_TO_DIRECT(VM_PAGE_TO_PHYS(ptdpg));
pmap->pm_segtab = (pd_entry_t *)ptdva;
CPU_ZERO(&pmap->pm_active);
pmap->pm_ptphint = NULL;
for (i = 0; i < MAXCPU; i++) {
pmap->pm_asid[i].asid = PMAP_ASID_RESERVED;
pmap->pm_asid[i].gen = 0;
}
TAILQ_INIT(&pmap->pm_pvlist);
bzero(&pmap->pm_stats, sizeof pmap->pm_stats);
return (1);
}
/*
* this routine is called if the page table page is not
* mapped correctly.
*/
static vm_page_t
_pmap_allocpte(pmap_t pmap, unsigned ptepindex, int flags)
{
vm_offset_t pageva;
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"));
/*
* Find or fabricate a new pagetable page
*/
if ((m = pmap_alloc_direct_page(ptepindex, VM_ALLOC_NORMAL)) == NULL) {
if (flags & M_WAITOK) {
PMAP_UNLOCK(pmap);
vm_page_unlock_queues();
pmap_grow_direct_page_cache();
vm_page_lock_queues();
PMAP_LOCK(pmap);
}
/*
* Indicate the need to retry. While waiting, the page
* table page may have been allocated.
*/
return (NULL);
}
/*
* Map the pagetable page into the process address space, if it
* isn't already there.
*/
pageva = MIPS_PHYS_TO_DIRECT(VM_PAGE_TO_PHYS(m));
#ifdef __mips_n64
if (ptepindex >= NUPDE) {
pmap->pm_segtab[ptepindex - NUPDE] = (pd_entry_t)pageva;
} else {
pd_entry_t *pdep, *pde;
int segindex = ptepindex >> (SEGSHIFT - PDRSHIFT);
int pdeindex = ptepindex & (NPDEPG - 1);
vm_page_t pg;
pdep = &pmap->pm_segtab[segindex];
if (*pdep == NULL) {
/* recurse for allocating page dir */
if (_pmap_allocpte(pmap, NUPDE + segindex,
flags) == NULL) {
/* alloc failed, release current */
--m->wire_count;
atomic_subtract_int(&cnt.v_wire_count, 1);
vm_page_free_zero(m);
return (NULL);
}
} else {
pg = PHYS_TO_VM_PAGE(MIPS_DIRECT_TO_PHYS(*pdep));
pg->wire_count++;
}
/* Next level entry */
pde = (pd_entry_t *)*pdep;
pde[pdeindex] = (pd_entry_t)pageva;
pmap->pm_ptphint = m;
}
#else
pmap->pm_segtab[ptepindex] = (pd_entry_t)pageva;
#endif
pmap->pm_stats.resident_count++;
/*
* Set the page table hint
*/
pmap->pm_ptphint = m;
return (m);
}
static vm_page_t
pmap_allocpte(pmap_t pmap, vm_offset_t va, int flags)
{
unsigned ptepindex;
pd_entry_t *pde;
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
*/
pde = pmap_pde(pmap, va);
/*
* If the page table page is mapped, we just increment the hold
* count, and activate it.
*/
if (pde != NULL && *pde != NULL) {
/*
* In order to get the page table page, try the hint first.
*/
if (pmap->pm_ptphint &&
(pmap->pm_ptphint->pindex == ptepindex)) {
m = pmap->pm_ptphint;
} else {
m = PHYS_TO_VM_PAGE(MIPS_DIRECT_TO_PHYS(*pde));
pmap->pm_ptphint = m;
}
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.
***************************************************/
/*
* Revision 1.397
* - Merged pmap_release and pmap_release_free_page. When pmap_release is
* called only the page directory page(s) can be left in the pmap pte
* object, since all page table pages will have been freed by
* pmap_remove_pages and pmap_remove. In addition, there can only be one
* reference to the pmap and the page directory is wired, so the page(s)
* can never be busy. So all there is to do is clear the magic mappings
* from the page directory and free the page(s).
*/
/*
* 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_offset_t ptdva;
vm_page_t ptdpg;
KASSERT(pmap->pm_stats.resident_count == 0,
("pmap_release: pmap resident count %ld != 0",
pmap->pm_stats.resident_count));
ptdva = (vm_offset_t)pmap->pm_segtab;
ptdpg = PHYS_TO_VM_PAGE(MIPS_DIRECT_TO_PHYS(ptdva));
ptdpg->wire_count--;
atomic_subtract_int(&cnt.v_wire_count, 1);
vm_page_free_zero(ptdpg);
PMAP_LOCK_DESTROY(pmap);
}
/*
* grow the number of kernel page table entries, if needed
*/
void
pmap_growkernel(vm_offset_t addr)
{
vm_page_t nkpg;
pd_entry_t *pde, *pdpe;
pt_entry_t *pte;
int i;
mtx_assert(&kernel_map->system_mtx, MA_OWNED);
addr = roundup2(addr, NBSEG);
if (addr - 1 >= kernel_map->max_offset)
addr = kernel_map->max_offset;
while (kernel_vm_end < addr) {
pdpe = pmap_segmap(kernel_pmap, kernel_vm_end);
#ifdef __mips_n64
if (*pdpe == 0) {
/* new intermediate page table entry */
nkpg = pmap_alloc_direct_page(nkpt, VM_ALLOC_INTERRUPT);
if (nkpg == NULL)
panic("pmap_growkernel: no memory to grow kernel");
*pdpe = (pd_entry_t)MIPS_PHYS_TO_DIRECT(VM_PAGE_TO_PHYS(nkpg));
continue; /* try again */
}
#endif
pde = pmap_pdpe_to_pde(pdpe, kernel_vm_end);
if (*pde != 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;
}
/*
* This index is bogus, but out of the way
*/
nkpg = pmap_alloc_direct_page(nkpt, VM_ALLOC_INTERRUPT);
if (!nkpg)
panic("pmap_growkernel: no memory to grow kernel");
nkpt++;
*pde = (pd_entry_t)MIPS_PHYS_TO_DIRECT(VM_PAGE_TO_PHYS(nkpg));
/*
* The R[4-7]?00 stores only one copy of the Global bit in
* the translation lookaside buffer for each 2 page entry.
* Thus invalid entrys must have the Global bit set so when
* Entry LO and Entry HI G bits are anded together they will
* produce a global bit to store in the tlb.
*/
pte = (pt_entry_t *)*pde;
for (i = 0; i < NPTEPG; i++)
pte[i] = PTE_G;
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.
***************************************************/
/*
* free the pv_entry back to the free list
*/
static PMAP_INLINE void
free_pv_entry(pv_entry_t pv)
{
pv_entry_count--;
uma_zfree(pvzone, pv);
}
/*
* get a new pv_entry, allocating a block from the system
* when needed.
* the memory allocation is performed bypassing the malloc code
* because of the possibility of allocations at interrupt time.
*/
static pv_entry_t
get_pv_entry(pmap_t locked_pmap)
{
static const struct timeval printinterval = { 60, 0 };
static struct timeval lastprint;
struct vpgqueues *vpq;
pt_entry_t *pte, oldpte;
pmap_t pmap;
pv_entry_t allocated_pv, next_pv, pv;
vm_offset_t va;
vm_page_t m;
PMAP_LOCK_ASSERT(locked_pmap, MA_OWNED);
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
allocated_pv = uma_zalloc(pvzone, M_NOWAIT);
if (allocated_pv != NULL) {
pv_entry_count++;
if (pv_entry_count > pv_entry_high_water)
pagedaemon_wakeup();
else
return (allocated_pv);
}
/*
* Reclaim pv entries: At first, destroy mappings to inactive
* pages. After that, if a pv entry is still needed, destroy
* mappings to active pages.
*/
if (ratecheck(&lastprint, &printinterval))
printf("Approaching the limit on PV entries, "
"increase the vm.pmap.shpgperproc tunable.\n");
vpq = &vm_page_queues[PQ_INACTIVE];
retry:
TAILQ_FOREACH(m, &vpq->pl, pageq) {
if ((m->flags & PG_MARKER) != 0 || m->hold_count || m->busy)
continue;
TAILQ_FOREACH_SAFE(pv, &m->md.pv_list, pv_list, next_pv) {
va = pv->pv_va;
pmap = pv->pv_pmap;
/* Avoid deadlock and lock recursion. */
if (pmap > locked_pmap)
PMAP_LOCK(pmap);
else if (pmap != locked_pmap && !PMAP_TRYLOCK(pmap))
continue;
pmap->pm_stats.resident_count--;
pte = pmap_pte(pmap, va);
KASSERT(pte != NULL, ("pte"));
oldpte = *pte;
if (is_kernel_pmap(pmap))
*pte = PTE_G;
else
*pte = 0;
KASSERT(!pte_test(&oldpte, PTE_W),
("wired pte for unwired page"));
if (m->md.pv_flags & PV_TABLE_REF)
vm_page_aflag_set(m, PGA_REFERENCED);
if (pte_test(&oldpte, PTE_D))
vm_page_dirty(m);
pmap_invalidate_page(pmap, va);
TAILQ_REMOVE(&pmap->pm_pvlist, pv, pv_plist);
m->md.pv_list_count--;
TAILQ_REMOVE(&m->md.pv_list, pv, pv_list);
pmap_unuse_pt(pmap, va, pv->pv_ptem);
if (pmap != locked_pmap)
PMAP_UNLOCK(pmap);
if (allocated_pv == NULL)
allocated_pv = pv;
else
free_pv_entry(pv);
}
if (TAILQ_EMPTY(&m->md.pv_list)) {
vm_page_aflag_clear(m, PGA_WRITEABLE);
m->md.pv_flags &= ~(PV_TABLE_REF | PV_TABLE_MOD);
}
}
if (allocated_pv == NULL) {
if (vpq == &vm_page_queues[PQ_INACTIVE]) {
vpq = &vm_page_queues[PQ_ACTIVE];
goto retry;
}
panic("get_pv_entry: increase the vm.pmap.shpgperproc tunable");
}
return (allocated_pv);
}
/*
* Revision 1.370
*
* Move pmap_collect() out of the machine-dependent code, rename it
* to reflect its new location, and add page queue and flag locking.
*
* Notes: (1) alpha, i386, and ia64 had identical implementations
* of pmap_collect() in terms of machine-independent interfaces;
* (2) sparc64 doesn't require it; (3) powerpc had it as a TODO.
*
* MIPS implementation was identical to alpha [Junos 8.2]
*/
/*
* If it is the first entry on the list, it is actually
* in the header and we must copy the following entry up
* to the header. Otherwise we must search the list for
* the entry. In either case we free the now unused entry.
*/
static pv_entry_t
pmap_pvh_remove(struct md_page *pvh, pmap_t pmap, vm_offset_t va)
{
pv_entry_t pv;
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
if (pvh->pv_list_count < pmap->pm_stats.resident_count) {
TAILQ_FOREACH(pv, &pvh->pv_list, pv_list) {
if (pmap == pv->pv_pmap && va == pv->pv_va)
break;
}
} else {
TAILQ_FOREACH(pv, &pmap->pm_pvlist, pv_plist) {
if (va == pv->pv_va)
break;
}
}
if (pv != NULL) {
TAILQ_REMOVE(&pvh->pv_list, pv, pv_list);
pvh->pv_list_count--;
TAILQ_REMOVE(&pmap->pm_pvlist, pv, pv_plist);
}
return (pv);
}
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, pa %lx va %lx",
(u_long)VM_PAGE_TO_PHYS(member2struct(vm_page, md, pvh)),
(u_long)va));
free_pv_entry(pv);
}
static void
pmap_remove_entry(pmap_t pmap, vm_page_t m, vm_offset_t va)
{
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
pmap_pvh_free(&m->md, pmap, va);
if (TAILQ_EMPTY(&m->md.pv_list))
vm_page_aflag_clear(m, PGA_WRITEABLE);
}
/*
* Conditionally create a pv entry.
*/
static boolean_t
pmap_try_insert_pv_entry(pmap_t pmap, vm_page_t mpte, vm_offset_t va,
vm_page_t m)
{
pv_entry_t pv;
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
if (pv_entry_count < pv_entry_high_water &&
(pv = uma_zalloc(pvzone, M_NOWAIT)) != NULL) {
pv_entry_count++;
pv->pv_va = va;
pv->pv_pmap = pmap;
pv->pv_ptem = mpte;
TAILQ_INSERT_TAIL(&pmap->pm_pvlist, pv, pv_plist);
TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list);
m->md.pv_list_count++;
return (TRUE);
} else
return (FALSE);
}
/*
* pmap_remove_pte: do the things to unmap a page in a process
*/
static int
pmap_remove_pte(struct pmap *pmap, pt_entry_t *ptq, vm_offset_t va)
{
pt_entry_t oldpte;
vm_page_t m;
vm_paddr_t pa;
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
oldpte = *ptq;
if (is_kernel_pmap(pmap))
*ptq = PTE_G;
else
*ptq = 0;
if (pte_test(&oldpte, PTE_W))
pmap->pm_stats.wired_count -= 1;
pmap->pm_stats.resident_count -= 1;
pa = TLBLO_PTE_TO_PA(oldpte);
if (page_is_managed(pa)) {
m = PHYS_TO_VM_PAGE(pa);
if (pte_test(&oldpte, PTE_D)) {
KASSERT(!pte_test(&oldpte, PTE_RO),
("%s: modified page not writable: va: %p, pte: %#jx",
__func__, (void *)va, (uintmax_t)oldpte));
vm_page_dirty(m);
}
if (m->md.pv_flags & PV_TABLE_REF)
vm_page_aflag_set(m, PGA_REFERENCED);
m->md.pv_flags &= ~(PV_TABLE_REF | PV_TABLE_MOD);
pmap_remove_entry(pmap, m, va);
}
return (pmap_unuse_pt(pmap, va, NULL));
}
/*
* Remove a single page from a process address space
*/
static void
pmap_remove_page(struct pmap *pmap, vm_offset_t va)
{
pt_entry_t *ptq;
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
ptq = pmap_pte(pmap, va);
/*
* if there is no pte for this address, just skip it!!!
*/
if (!ptq || !pte_test(ptq, PTE_V)) {
return;
}
/*
* Write back all caches from the page being destroyed
*/
mips_dcache_wbinv_range_index(va, PAGE_SIZE);
/*
* get a local va for mappings for this pmap.
*/
(void)pmap_remove_pte(pmap, ptq, va);
pmap_invalidate_page(pmap, va);
return;
}
/*
* 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(struct pmap *pmap, vm_offset_t sva, vm_offset_t eva)
{
vm_offset_t va_next;
pd_entry_t *pde, *pdpe;
pt_entry_t *pte;
if (pmap == NULL)
return;
if (pmap->pm_stats.resident_count == 0)
return;
vm_page_lock_queues();
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) {
pmap_remove_page(pmap, sva);
goto out;
}
for (; sva < eva; sva = va_next) {
pdpe = pmap_segmap(pmap, sva);
#ifdef __mips_n64
if (*pdpe == 0) {
va_next = (sva + NBSEG) & ~SEGMASK;
if (va_next < sva)
va_next = eva;
continue;
}
#endif
va_next = (sva + NBPDR) & ~PDRMASK;
if (va_next < sva)
va_next = eva;
pde = pmap_pdpe_to_pde(pdpe, sva);
if (*pde == 0)
continue;
if (va_next > eva)
va_next = eva;
for (pte = pmap_pde_to_pte(pde, sva); sva != va_next;
pte++, sva += PAGE_SIZE) {
pmap_remove_page(pmap, sva);
}
}
out:
vm_page_unlock_queues();
PMAP_UNLOCK(pmap);
}
/*
* 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)
{
pv_entry_t pv;
pt_entry_t *pte, tpte;
KASSERT((m->oflags & VPO_UNMANAGED) == 0,
("pmap_remove_all: page %p is not managed", m));
vm_page_lock_queues();
if (m->md.pv_flags & PV_TABLE_REF)
vm_page_aflag_set(m, PGA_REFERENCED);
while ((pv = TAILQ_FIRST(&m->md.pv_list)) != NULL) {
PMAP_LOCK(pv->pv_pmap);
/*
* If it's last mapping writeback all caches from
* the page being destroyed
*/
if (m->md.pv_list_count == 1)
mips_dcache_wbinv_range_index(pv->pv_va, PAGE_SIZE);
pv->pv_pmap->pm_stats.resident_count--;
pte = pmap_pte(pv->pv_pmap, pv->pv_va);
tpte = *pte;
if (is_kernel_pmap(pv->pv_pmap))
*pte = PTE_G;
else
*pte = 0;
if (pte_test(&tpte, PTE_W))
pv->pv_pmap->pm_stats.wired_count--;
/*
* Update the vm_page_t clean and reference bits.
*/
if (pte_test(&tpte, PTE_D)) {
KASSERT(!pte_test(&tpte, PTE_RO),
("%s: modified page not writable: va: %p, pte: %#jx",
__func__, (void *)pv->pv_va, (uintmax_t)tpte));
vm_page_dirty(m);
}
pmap_invalidate_page(pv->pv_pmap, pv->pv_va);
TAILQ_REMOVE(&pv->pv_pmap->pm_pvlist, pv, pv_plist);
TAILQ_REMOVE(&m->md.pv_list, pv, pv_list);
m->md.pv_list_count--;
pmap_unuse_pt(pv->pv_pmap, pv->pv_va, pv->pv_ptem);
PMAP_UNLOCK(pv->pv_pmap);
free_pv_entry(pv);
}
vm_page_aflag_clear(m, PGA_WRITEABLE);
m->md.pv_flags &= ~(PV_TABLE_REF | PV_TABLE_MOD);
vm_page_unlock_queues();
}
/*
* 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)
{
pt_entry_t *pte;
pd_entry_t *pde, *pdpe;
vm_offset_t va_next;
if (pmap == NULL)
return;
if ((prot & VM_PROT_READ) == VM_PROT_NONE) {
pmap_remove(pmap, sva, eva);
return;
}
if (prot & VM_PROT_WRITE)
return;
vm_page_lock_queues();
PMAP_LOCK(pmap);
for (; sva < eva; sva = va_next) {
pt_entry_t pbits;
vm_page_t m;
vm_paddr_t pa;
pdpe = pmap_segmap(pmap, sva);
#ifdef __mips_n64
if (*pdpe == 0) {
va_next = (sva + NBSEG) & ~SEGMASK;
if (va_next < sva)
va_next = eva;
continue;
}
#endif
va_next = (sva + NBPDR) & ~PDRMASK;
if (va_next < sva)
va_next = eva;
pde = pmap_pdpe_to_pde(pdpe, sva);
if (pde == NULL || *pde == NULL)
continue;
if (va_next > eva)
va_next = eva;
for (pte = pmap_pde_to_pte(pde, sva); sva != va_next; pte++,
sva += PAGE_SIZE) {
/* Skip invalid PTEs */
if (!pte_test(pte, PTE_V))
continue;
pbits = *pte;
pa = TLBLO_PTE_TO_PA(pbits);
if (page_is_managed(pa) && pte_test(&pbits, PTE_D)) {
m = PHYS_TO_VM_PAGE(pa);
vm_page_dirty(m);
m->md.pv_flags &= ~PV_TABLE_MOD;
}
pte_clear(&pbits, PTE_D);
pte_set(&pbits, PTE_RO);
if (pbits != *pte) {
*pte = pbits;
pmap_update_page(pmap, sva, pbits);
}
}
}
vm_page_unlock_queues();
PMAP_UNLOCK(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)
{
vm_paddr_t pa, opa;
pt_entry_t *pte;
pt_entry_t origpte, newpte;
pv_entry_t pv;
vm_page_t mpte, om;
pt_entry_t rw = 0;
if (pmap == NULL)
return;
va &= ~PAGE_MASK;
KASSERT(va <= VM_MAX_KERNEL_ADDRESS, ("pmap_enter: toobig"));
KASSERT((m->oflags & (VPO_UNMANAGED | VPO_BUSY)) != 0,
("pmap_enter: page %p is not busy", m));
mpte = NULL;
vm_page_lock_queues();
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);
}
pte = pmap_pte(pmap, va);
/*
* Page Directory table entry not valid, we need a new PT page
*/
if (pte == NULL) {
panic("pmap_enter: invalid page directory, pdir=%p, va=%p",
(void *)pmap->pm_segtab, (void *)va);
}
pa = VM_PAGE_TO_PHYS(m);
om = NULL;
origpte = *pte;
opa = TLBLO_PTE_TO_PA(origpte);
/*
* Mapping has not changed, must be protection or wiring change.
*/
if (pte_test(&origpte, PTE_V) && 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 && !pte_test(&origpte, PTE_W))
pmap->pm_stats.wired_count++;
else if (!wired && pte_test(&origpte, PTE_W))
pmap->pm_stats.wired_count--;
KASSERT(!pte_test(&origpte, PTE_D | PTE_RO),
("%s: modified page not writable: va: %p, pte: %#jx",
__func__, (void *)va, (uintmax_t)origpte));
/*
* Remove extra pte reference
*/
if (mpte)
mpte->wire_count--;
if (page_is_managed(opa)) {
om = m;
}
goto validate;
}
pv = NULL;
/*
* Mapping has changed, invalidate old range and fall through to
* handle validating new mapping.
*/
if (opa) {
if (pte_test(&origpte, PTE_W))
pmap->pm_stats.wired_count--;
if (page_is_managed(opa)) {
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: %p", (void *)va));
}
} else
pmap->pm_stats.resident_count++;
/*
* Enter on the PV list if part of our managed memory. Note that we
* raise IPL while manipulating pv_table since pmap_enter can be
* called at interrupt time.
*/
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);
pv->pv_va = va;
pv->pv_pmap = pmap;
pv->pv_ptem = mpte;
TAILQ_INSERT_TAIL(&pmap->pm_pvlist, pv, pv_plist);
TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list);
m->md.pv_list_count++;
} else if (pv != NULL)
free_pv_entry(pv);
/*
* Increment counters
*/
if (wired)
pmap->pm_stats.wired_count++;
validate:
if ((access & VM_PROT_WRITE) != 0)
m->md.pv_flags |= PV_TABLE_MOD | PV_TABLE_REF;
rw = init_pte_prot(va, m, prot);
#ifdef PMAP_DEBUG
printf("pmap_enter: va: %p -> pa: %p\n", (void *)va, (void *)pa);
#endif
/*
* Now validate mapping with desired protection/wiring.
*/
newpte = TLBLO_PA_TO_PFN(pa) | rw | PTE_V;
if (is_cacheable_mem(pa))
newpte |= PTE_C_CACHE;
else
newpte |= PTE_C_UNCACHED;
if (wired)
newpte |= PTE_W;
if (is_kernel_pmap(pmap))
newpte |= PTE_G;
/*
* if the mapping or permission bits are different, we need to
* update the pte.
*/
if (origpte != newpte) {
if (pte_test(&origpte, PTE_V)) {
*pte = newpte;
if (page_is_managed(opa) && (opa != pa)) {
if (om->md.pv_flags & PV_TABLE_REF)
vm_page_aflag_set(om, PGA_REFERENCED);
om->md.pv_flags &=
~(PV_TABLE_REF | PV_TABLE_MOD);
}
if (pte_test(&origpte, PTE_D)) {
KASSERT(!pte_test(&origpte, PTE_RO),
("pmap_enter: modified page not writable:"
" va: %p, pte: %#jx", (void *)va, (uintmax_t)origpte));
if (page_is_managed(opa))
vm_page_dirty(om);
}
if (page_is_managed(opa) &&
TAILQ_EMPTY(&om->md.pv_list))
vm_page_aflag_clear(om, PGA_WRITEABLE);
} else {
*pte = newpte;
}
}
pmap_update_page(pmap, va, newpte);
/*
* Sync I & D caches for executable pages. Do this only if the
* target pmap belongs to the current process. Otherwise, an
* unresolvable TLB miss may occur.
*/
if (!is_kernel_pmap(pmap) && (pmap == &curproc->p_vmspace->vm_pmap) &&
(prot & VM_PROT_EXECUTE)) {
mips_icache_sync_range(va, PAGE_SIZE);
mips_dcache_wbinv_range(va, PAGE_SIZE);
}
vm_page_unlock_queues();
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)
{
vm_page_lock_queues();
PMAP_LOCK(pmap);
(void)pmap_enter_quick_locked(pmap, va, m, prot, NULL);
vm_page_unlock_queues();
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)
{
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"));
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
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) {
pd_entry_t *pde;
unsigned ptepindex;
/*
* Calculate pagetable page index
*/
ptepindex = pmap_pde_pindex(va);
if (mpte && (mpte->pindex == ptepindex)) {
mpte->wire_count++;
} else {
/*
* Get the page directory entry
*/
pde = pmap_pde(pmap, va);
/*
* If the page table page is mapped, we just
* increment the hold count, and activate it.
*/
if (pde && *pde != 0) {
if (pmap->pm_ptphint &&
(pmap->pm_ptphint->pindex == ptepindex)) {
mpte = pmap->pm_ptphint;
} else {
mpte = PHYS_TO_VM_PAGE(
MIPS_DIRECT_TO_PHYS(*pde));
pmap->pm_ptphint = mpte;
}
mpte->wire_count++;
} else {
mpte = _pmap_allocpte(pmap, ptepindex,
M_NOWAIT);
if (mpte == NULL)
return (mpte);
}
}
} else {
mpte = NULL;
}
pte = pmap_pte(pmap, va);
if (pte_test(pte, PTE_V)) {
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, mpte, va, m)) {
if (mpte != NULL) {
pmap_unwire_pte_hold(pmap, va, mpte);
mpte = NULL;
}
return (mpte);
}
/*
* Increment counters
*/
pmap->pm_stats.resident_count++;
pa = VM_PAGE_TO_PHYS(m);
/*
* Now validate mapping with RO protection
*/
*pte = TLBLO_PA_TO_PFN(pa) | PTE_V;
if (is_cacheable_mem(pa))
*pte |= PTE_C_CACHE;
else
*pte |= PTE_C_UNCACHED;
if (is_kernel_pmap(pmap))
*pte |= PTE_G;
else {
*pte |= PTE_RO;
/*
* Sync I & D caches. Do this only if the target pmap
* belongs to the current process. Otherwise, an
* unresolvable TLB miss may occur. */
if (pmap == &curproc->p_vmspace->vm_pmap) {
va &= ~PAGE_MASK;
mips_icache_sync_range(va, PAGE_SIZE);
mips_dcache_wbinv_range(va, PAGE_SIZE);
}
}
return (mpte);
}
/*
* Make a temporary mapping for a physical address. This is only intended
* to be used for panic dumps.
*
* Use XKPHYS for 64 bit, and KSEG0 where possible for 32 bit.
*/
void *
pmap_kenter_temporary(vm_paddr_t pa, int i)
{
vm_offset_t va;
if (i != 0)
printf("%s: ERROR!!! More than one page of virtual address mapping not supported\n",
__func__);
if (MIPS_DIRECT_MAPPABLE(pa)) {
va = MIPS_PHYS_TO_DIRECT(pa);
} else {
#ifndef __mips_n64 /* XXX : to be converted to new style */
int cpu;
register_t intr;
struct local_sysmaps *sysm;
pt_entry_t *pte, npte;
/* If this is used other than for dumps, we may need to leave
* interrupts disasbled on return. If crash dumps don't work when
* we get to this point, we might want to consider this (leaving things
* disabled as a starting point ;-)
*/
intr = intr_disable();
cpu = PCPU_GET(cpuid);
sysm = &sysmap_lmem[cpu];
/* Since this is for the debugger, no locks or any other fun */
npte = TLBLO_PA_TO_PFN(pa) | PTE_D | PTE_V | PTE_G | PTE_W | PTE_C_CACHE;
pte = pmap_pte(kernel_pmap, sysm->base);
*pte = npte;
sysm->valid1 = 1;
pmap_update_page(kernel_pmap, sysm->base, npte);
va = sysm->base;
intr_restore(intr);
#endif
}
return ((void *)va);
}
void
pmap_kenter_temporary_free(vm_paddr_t pa)
{
#ifndef __mips_n64 /* XXX : to be converted to new style */
int cpu;
register_t intr;
struct local_sysmaps *sysm;
#endif
if (MIPS_DIRECT_MAPPABLE(pa)) {
/* nothing to do for this case */
return;
}
#ifndef __mips_n64 /* XXX : to be converted to new style */
cpu = PCPU_GET(cpuid);
sysm = &sysmap_lmem[cpu];
if (sysm->valid1) {
pt_entry_t *pte;
intr = intr_disable();
pte = pmap_pte(kernel_pmap, sysm->base);
*pte = PTE_G;
pmap_invalidate_page(kernel_pmap, sysm->base);
intr_restore(intr);
sysm->valid1 = 0;
}
#endif
}
/*
* Moved the code to Machine Independent
* vm_map_pmap_enter()
*/
/*
* 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_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;
vm_page_lock_queues();
PMAP_LOCK(pmap);
while (m != NULL && (diff = m->pindex - m_start->pindex) < psize) {
mpte = pmap_enter_quick_locked(pmap, start + ptoa(diff), m,
prot, mpte);
m = TAILQ_NEXT(m, listq);
}
vm_page_unlock_queues();
PMAP_UNLOCK(pmap);
}
/*
* pmap_object_init_pt preloads the ptes for a given object
* into the specified pmap. This eliminates the blast of soft
* faults on process startup and immediately after an mmap.
*/
void
pmap_object_init_pt(pmap_t pmap, vm_offset_t addr,
vm_object_t object, vm_pindex_t pindex, vm_size_t size)
{
VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
KASSERT(object->type == OBJT_DEVICE || object->type == OBJT_SG,
("pmap_object_init_pt: non-device object"));
}
/*
* 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)
{
pt_entry_t *pte;
if (pmap == NULL)
return;
PMAP_LOCK(pmap);
pte = pmap_pte(pmap, va);
if (wired && !pte_test(pte, PTE_W))
pmap->pm_stats.wired_count++;
else if (!wired && pte_test(pte, PTE_W))
pmap->pm_stats.wired_count--;
/*
* Wiring is not a hardware characteristic so there is no need to
* invalidate TLB.
*/
if (wired)
pte_set(pte, PTE_W);
else
pte_clear(pte, PTE_W);
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)
{
}
/*
* pmap_zero_page zeros the specified hardware page by mapping
* the page into KVM and using bzero to clear its contents.
*
* Use XKPHYS for 64 bit, and KSEG0 where possible for 32 bit.
*/
void
pmap_zero_page(vm_page_t m)
{
vm_offset_t va;
vm_paddr_t phys = VM_PAGE_TO_PHYS(m);
if (MIPS_DIRECT_MAPPABLE(phys)) {
va = MIPS_PHYS_TO_DIRECT(phys);
bzero((caddr_t)va, PAGE_SIZE);
mips_dcache_wbinv_range(va, PAGE_SIZE);
} else {
va = pmap_lmem_map1(phys);
bzero((caddr_t)va, PAGE_SIZE);
mips_dcache_wbinv_range(va, PAGE_SIZE);
pmap_lmem_unmap();
}
}
/*
* 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;
vm_paddr_t phys = VM_PAGE_TO_PHYS(m);
if (MIPS_DIRECT_MAPPABLE(phys)) {
va = MIPS_PHYS_TO_DIRECT(phys);
bzero((char *)(caddr_t)va + off, size);
mips_dcache_wbinv_range(va + off, size);
} else {
va = pmap_lmem_map1(phys);
bzero((char *)va + off, size);
mips_dcache_wbinv_range(va + off, size);
pmap_lmem_unmap();
}
}
void
pmap_zero_page_idle(vm_page_t m)
{
vm_offset_t va;
vm_paddr_t phys = VM_PAGE_TO_PHYS(m);
if (MIPS_DIRECT_MAPPABLE(phys)) {
va = MIPS_PHYS_TO_DIRECT(phys);
bzero((caddr_t)va, PAGE_SIZE);
mips_dcache_wbinv_range(va, PAGE_SIZE);
} else {
va = pmap_lmem_map1(phys);
bzero((caddr_t)va, PAGE_SIZE);
mips_dcache_wbinv_range(va, PAGE_SIZE);
pmap_lmem_unmap();
}
}
/*
* 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.
*
* Use XKPHYS for 64 bit, and KSEG0 where possible for 32 bit.
*/
void
pmap_copy_page(vm_page_t src, vm_page_t dst)
{
vm_offset_t va_src, va_dst;
vm_paddr_t phys_src = VM_PAGE_TO_PHYS(src);
vm_paddr_t phys_dst = VM_PAGE_TO_PHYS(dst);
if (MIPS_DIRECT_MAPPABLE(phys_src) && MIPS_DIRECT_MAPPABLE(phys_dst)) {
/* easy case, all can be accessed via KSEG0 */
/*
* Flush all caches for VA that are mapped to this page
* to make sure that data in SDRAM is up to date
*/
pmap_flush_pvcache(src);
mips_dcache_wbinv_range_index(
MIPS_PHYS_TO_DIRECT(phys_dst), PAGE_SIZE);
va_src = MIPS_PHYS_TO_DIRECT(phys_src);
va_dst = MIPS_PHYS_TO_DIRECT(phys_dst);
bcopy((caddr_t)va_src, (caddr_t)va_dst, PAGE_SIZE);
mips_dcache_wbinv_range(va_dst, PAGE_SIZE);
} else {
va_src = pmap_lmem_map2(phys_src, phys_dst);
va_dst = va_src + PAGE_SIZE;
bcopy((void *)va_src, (void *)va_dst, PAGE_SIZE);
mips_dcache_wbinv_range(va_dst, PAGE_SIZE);
pmap_lmem_unmap();
}
}
/*
* 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)
{
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;
vm_page_lock_queues();
TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) {
if (pv->pv_pmap == pmap) {
rv = TRUE;
break;
}
loops++;
if (loops >= 16)
break;
}
vm_page_unlock_queues();
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)
{
pt_entry_t *pte, tpte;
pv_entry_t pv, npv;
vm_page_t m;
if (pmap != vmspace_pmap(curthread->td_proc->p_vmspace)) {
printf("warning: pmap_remove_pages called with non-current pmap\n");
return;
}
vm_page_lock_queues();
PMAP_LOCK(pmap);
for (pv = TAILQ_FIRST(&pmap->pm_pvlist); pv != NULL; pv = npv) {
pte = pmap_pte(pv->pv_pmap, pv->pv_va);
if (!pte_test(pte, PTE_V))
panic("pmap_remove_pages: page on pm_pvlist has no pte");
tpte = *pte;
/*
* We cannot remove wired pages from a process' mapping at this time
*/
if (pte_test(&tpte, PTE_W)) {
npv = TAILQ_NEXT(pv, pv_plist);
continue;
}
*pte = is_kernel_pmap(pmap) ? PTE_G : 0;
m = PHYS_TO_VM_PAGE(TLBLO_PTE_TO_PA(tpte));
KASSERT(m != NULL,
("pmap_remove_pages: bad tpte %#jx", (uintmax_t)tpte));
pv->pv_pmap->pm_stats.resident_count--;
/*
* Update the vm_page_t clean and reference bits.
*/
if (pte_test(&tpte, PTE_D)) {
vm_page_dirty(m);
}
npv = TAILQ_NEXT(pv, pv_plist);
TAILQ_REMOVE(&pv->pv_pmap->pm_pvlist, pv, pv_plist);
m->md.pv_list_count--;
TAILQ_REMOVE(&m->md.pv_list, pv, pv_list);
if (TAILQ_FIRST(&m->md.pv_list) == NULL) {
vm_page_aflag_clear(m, PGA_WRITEABLE);
}
pmap_unuse_pt(pv->pv_pmap, pv->pv_va, pv->pv_ptem);
free_pv_entry(pv);
}
pmap_invalidate_all(pmap);
PMAP_UNLOCK(pmap);
vm_page_unlock_queues();
}
/*
* pmap_testbit tests bits in pte's
* note that the testbit/changebit routines are inline,
* and a lot of things compile-time evaluate.
*/
static boolean_t
pmap_testbit(vm_page_t m, int bit)
{
pv_entry_t pv;
pt_entry_t *pte;
boolean_t rv = FALSE;
if (m->oflags & VPO_UNMANAGED)
return (rv);
if (TAILQ_FIRST(&m->md.pv_list) == NULL)
return (rv);
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) {
PMAP_LOCK(pv->pv_pmap);
pte = pmap_pte(pv->pv_pmap, pv->pv_va);
rv = pte_test(pte, bit);
PMAP_UNLOCK(pv->pv_pmap);
if (rv)
break;
}
return (rv);
}
/*
* this routine is used to clear dirty bits in ptes
*/
static __inline void
pmap_changebit(vm_page_t m, int bit, boolean_t setem)
{
pv_entry_t pv;
pt_entry_t *pte;
if (m->oflags & VPO_UNMANAGED)
return;
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
/*
* Loop over all current mappings setting/clearing as appropos If
* setting RO do we need to clear the VAC?
*/
TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) {
PMAP_LOCK(pv->pv_pmap);
pte = pmap_pte(pv->pv_pmap, pv->pv_va);
if (setem) {
*pte |= bit;
pmap_update_page(pv->pv_pmap, pv->pv_va, *pte);
} else {
pt_entry_t pbits = *pte;
if (pbits & bit) {
if (bit == PTE_D) {
if (pbits & PTE_D)
vm_page_dirty(m);
*pte = (pbits & ~PTE_D) | PTE_RO;
} else {
*pte = pbits & ~bit;
}
pmap_update_page(pv->pv_pmap, pv->pv_va, *pte);
}
}
PMAP_UNLOCK(pv->pv_pmap);
}
if (!setem && bit == PTE_D)
vm_page_aflag_clear(m, PGA_WRITEABLE);
}
/*
* 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)
{
pv_entry_t pv;
pmap_t pmap;
pt_entry_t *pte;
int count;
count = 0;
if ((m->oflags & VPO_UNMANAGED) != 0)
return (count);
vm_page_lock_queues();
TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) {
pmap = pv->pv_pmap;
PMAP_LOCK(pmap);
pte = pmap_pte(pmap, pv->pv_va);
if (pte_test(pte, PTE_W))
count++;
PMAP_UNLOCK(pmap);
}
vm_page_unlock_queues();
return (count);
}
/*
* Clear the write and modified bits in each of the given page's mappings.
*/
void
pmap_remove_write(vm_page_t m)
{
pv_entry_t pv, npv;
vm_offset_t va;
pt_entry_t *pte;
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;
/*
* Loop over all current mappings setting/clearing as appropos.
*/
vm_page_lock_queues();
for (pv = TAILQ_FIRST(&m->md.pv_list); pv; pv = npv) {
npv = TAILQ_NEXT(pv, pv_plist);
pte = pmap_pte(pv->pv_pmap, pv->pv_va);
if (pte == NULL || !pte_test(pte, PTE_V))
panic("page on pm_pvlist has no pte");
va = pv->pv_va;
pmap_protect(pv->pv_pmap, va, va + PAGE_SIZE,
VM_PROT_READ | VM_PROT_EXECUTE);
}
vm_page_aflag_clear(m, PGA_WRITEABLE);
vm_page_unlock_queues();
}
/*
* pmap_ts_referenced:
*
* Return the count of reference bits for a page, clearing all of them.
*/
int
pmap_ts_referenced(vm_page_t m)
{
KASSERT((m->oflags & VPO_UNMANAGED) == 0,
("pmap_ts_referenced: page %p is not managed", m));
if (m->md.pv_flags & PV_TABLE_REF) {
vm_page_lock_queues();
m->md.pv_flags &= ~PV_TABLE_REF;
vm_page_unlock_queues();
return (1);
}
return (0);
}
/*
* 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 PTE_D set.
*/
VM_OBJECT_LOCK_ASSERT(m->object, MA_OWNED);
if ((m->oflags & VPO_BUSY) == 0 &&
(m->aflags & PGA_WRITEABLE) == 0)
return (FALSE);
vm_page_lock_queues();
if (m->md.pv_flags & PV_TABLE_MOD)
rv = TRUE;
else
rv = pmap_testbit(m, PTE_D);
vm_page_unlock_queues();
return (rv);
}
/* N/C */
/*
* 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 != 0) {
pte = pmap_pde_to_pte(pde, addr);
rv = (*pte == 0);
}
PMAP_UNLOCK(pmap);
return (rv);
}
/*
* Clear the modify bits on the specified physical page.
*/
void
pmap_clear_modify(vm_page_t m)
{
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 PTE_D 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;
vm_page_lock_queues();
if (m->md.pv_flags & PV_TABLE_MOD) {
pmap_changebit(m, PTE_D, FALSE);
m->md.pv_flags &= ~PV_TABLE_MOD;
}
vm_page_unlock_queues();
}
/*
* 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)
{
KASSERT((m->oflags & VPO_UNMANAGED) == 0,
("pmap_is_referenced: page %p is not managed", m));
return ((m->md.pv_flags & PV_TABLE_REF) != 0);
}
/*
* pmap_clear_reference:
*
* Clear the reference bit on the specified physical page.
*/
void
pmap_clear_reference(vm_page_t m)
{
KASSERT((m->oflags & VPO_UNMANAGED) == 0,
("pmap_clear_reference: page %p is not managed", m));
vm_page_lock_queues();
if (m->md.pv_flags & PV_TABLE_REF) {
m->md.pv_flags &= ~PV_TABLE_REF;
}
vm_page_unlock_queues();
}
/*
* Miscellaneous support routines follow
*/
/*
* 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.
*/
/*
* 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.
*
* Use XKPHYS uncached for 64 bit, and KSEG1 where possible for 32 bit.
*/
void *
pmap_mapdev(vm_paddr_t pa, vm_size_t size)
{
vm_offset_t va, tmpva, offset;
/*
* KSEG1 maps only first 512M of phys address space. For
* pa > 0x20000000 we should make proper mapping * using pmap_kenter.
*/
if (MIPS_DIRECT_MAPPABLE(pa + size - 1))
return ((void *)MIPS_PHYS_TO_DIRECT_UNCACHED(pa));
else {
offset = pa & PAGE_MASK;
size = roundup(size + offset, 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 (tmpva = va; size > 0;) {
pmap_kenter_attr(tmpva, pa, PTE_C_UNCACHED);
size -= PAGE_SIZE;
tmpva += PAGE_SIZE;
pa += PAGE_SIZE;
}
}
return ((void *)(va + offset));
}
void
pmap_unmapdev(vm_offset_t va, vm_size_t size)
{
#ifndef __mips_n64
vm_offset_t base, offset, tmpva;
/* If the address is within KSEG1 then there is nothing to do */
if (va >= MIPS_KSEG1_START && va <= MIPS_KSEG1_END)
return;
base = trunc_page(va);
offset = va & PAGE_MASK;
size = roundup(size + offset, PAGE_SIZE);
for (tmpva = base; tmpva < base + size; tmpva += PAGE_SIZE)
pmap_kremove(tmpva);
kmem_free(kernel_map, base, size);
#endif
}
/*
* perform the pmap work for mincore
*/
int
pmap_mincore(pmap_t pmap, vm_offset_t addr, vm_paddr_t *locked_pa)
{
pt_entry_t *ptep, pte;
vm_paddr_t pa;
vm_page_t m;
int val;
boolean_t managed;
PMAP_LOCK(pmap);
retry:
ptep = pmap_pte(pmap, addr);
pte = (ptep != NULL) ? *ptep : 0;
if (!pte_test(&pte, PTE_V)) {
val = 0;
goto out;
}
val = MINCORE_INCORE;
if (pte_test(&pte, PTE_D))
val |= MINCORE_MODIFIED | MINCORE_MODIFIED_OTHER;
pa = TLBLO_PTE_TO_PA(pte);
managed = page_is_managed(pa);
if (managed) {
/*
* This may falsely report the given address as
* MINCORE_REFERENCED. Unfortunately, due to the lack of
* per-PTE reference information, it is impossible to
* determine if the address is MINCORE_REFERENCED.
*/
m = PHYS_TO_VM_PAGE(pa);
if ((m->aflags & PGA_REFERENCED) != 0)
val |= MINCORE_REFERENCED | MINCORE_REFERENCED_OTHER;
}
if ((val & (MINCORE_MODIFIED_OTHER | MINCORE_REFERENCED_OTHER)) !=
(MINCORE_MODIFIED_OTHER | MINCORE_REFERENCED_OTHER) && managed) {
/* Ensure that "PHYS_TO_VM_PAGE(pa)->object" doesn't change. */
if (vm_page_pa_tryrelock(pmap, pa, locked_pa))
goto retry;
} else
out:
PA_UNLOCK_COND(*locked_pa);
PMAP_UNLOCK(pmap);
return (val);
}
void
pmap_activate(struct thread *td)
{
pmap_t pmap, oldpmap;
struct proc *p = td->td_proc;
u_int cpuid;
critical_enter();
pmap = vmspace_pmap(p->p_vmspace);
oldpmap = PCPU_GET(curpmap);
cpuid = PCPU_GET(cpuid);
if (oldpmap)
CPU_CLR_ATOMIC(cpuid, &oldpmap->pm_active);
CPU_SET_ATOMIC(cpuid, &pmap->pm_active);
pmap_asid_alloc(pmap);
if (td == curthread) {
PCPU_SET(segbase, pmap->pm_segtab);
mips_wr_entryhi(pmap->pm_asid[cpuid].asid);
}
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 < NBSEG)
return;
if (object != NULL && (object->flags & OBJ_COLORED) != 0)
offset += ptoa(object->pg_color);
superpage_offset = offset & SEGMASK;
if (size - ((NBSEG - superpage_offset) & SEGMASK) < NBSEG ||
(*addr & SEGMASK) == superpage_offset)
return;
if ((*addr & SEGMASK) < superpage_offset)
*addr = (*addr & ~SEGMASK) + superpage_offset;
else
*addr = ((*addr + SEGMASK) & ~SEGMASK) + superpage_offset;
}
/*
* Increase the starting virtual address of the given mapping so
* that it is aligned to not be the second page in a TLB entry.
* This routine assumes that the length is appropriately-sized so
* that the allocation does not share a TLB entry at all if required.
*/
void
pmap_align_tlb(vm_offset_t *addr)
{
if ((*addr & PAGE_SIZE) == 0)
return;
*addr += PAGE_SIZE;
return;
}
#ifdef DDB
DB_SHOW_COMMAND(ptable, ddb_pid_dump)
{
pmap_t pmap;
struct thread *td = NULL;
struct proc *p;
int i, j, k;
vm_paddr_t pa;
vm_offset_t va;
if (have_addr) {
td = db_lookup_thread(addr, TRUE);
if (td == NULL) {
db_printf("Invalid pid or tid");
return;
}
p = td->td_proc;
if (p->p_vmspace == NULL) {
db_printf("No vmspace for process");
return;
}
pmap = vmspace_pmap(p->p_vmspace);
} else
pmap = kernel_pmap;
db_printf("pmap:%p segtab:%p asid:%x generation:%x\n",
pmap, pmap->pm_segtab, pmap->pm_asid[0].asid,
pmap->pm_asid[0].gen);
for (i = 0; i < NPDEPG; i++) {
pd_entry_t *pdpe;
pt_entry_t *pde;
pt_entry_t pte;
pdpe = (pd_entry_t *)pmap->pm_segtab[i];
if (pdpe == NULL)
continue;
db_printf("[%4d] %p\n", i, pdpe);
#ifdef __mips_n64
for (j = 0; j < NPDEPG; j++) {
pde = (pt_entry_t *)pdpe[j];
if (pde == NULL)
continue;
db_printf("\t[%4d] %p\n", j, pde);
#else
{
j = 0;
pde = (pt_entry_t *)pdpe;
#endif
for (k = 0; k < NPTEPG; k++) {
pte = pde[k];
if (pte == 0 || !pte_test(&pte, PTE_V))
continue;
pa = TLBLO_PTE_TO_PA(pte);
va = ((u_long)i << SEGSHIFT) | (j << PDRSHIFT) | (k << PAGE_SHIFT);
db_printf("\t\t[%04d] va: %p pte: %8jx pa:%jx\n",
k, (void *)va, (uintmax_t)pte, (uintmax_t)pa);
}
}
}
}
#endif
#if defined(DEBUG)
static void pads(pmap_t pm);
void pmap_pvdump(vm_offset_t pa);
/* print address space of pmap*/
static void
pads(pmap_t pm)
{
unsigned va, i, j;
pt_entry_t *ptep;
if (pm == kernel_pmap)
return;
for (i = 0; i < NPTEPG; i++)
if (pm->pm_segtab[i])
for (j = 0; j < NPTEPG; j++) {
va = (i << SEGSHIFT) + (j << PAGE_SHIFT);
if (pm == kernel_pmap && va < KERNBASE)
continue;
if (pm != kernel_pmap &&
va >= VM_MAXUSER_ADDRESS)
continue;
ptep = pmap_pte(pm, va);
if (pte_test(ptep, PTE_V))
printf("%x:%x ", va, *(int *)ptep);
}
}
void
pmap_pvdump(vm_offset_t pa)
{
register pv_entry_t pv;
vm_page_t m;
printf("pa %x", pa);
m = PHYS_TO_VM_PAGE(pa);
for (pv = TAILQ_FIRST(&m->md.pv_list); pv;
pv = TAILQ_NEXT(pv, pv_list)) {
printf(" -> pmap %p, va %x", (void *)pv->pv_pmap, pv->pv_va);
pads(pv->pv_pmap);
}
printf(" ");
}
/* N/C */
#endif
/*
* Allocate TLB address space tag (called ASID or TLBPID) and return it.
* It takes almost as much or more time to search the TLB for a
* specific ASID and flush those entries as it does to flush the entire TLB.
* Therefore, when we allocate a new ASID, we just take the next number. When
* we run out of numbers, we flush the TLB, increment the generation count
* and start over. ASID zero is reserved for kernel use.
*/
static void
pmap_asid_alloc(pmap)
pmap_t pmap;
{
if (pmap->pm_asid[PCPU_GET(cpuid)].asid != PMAP_ASID_RESERVED &&
pmap->pm_asid[PCPU_GET(cpuid)].gen == PCPU_GET(asid_generation));
else {
if (PCPU_GET(next_asid) == pmap_max_asid) {
tlb_invalidate_all_user(NULL);
PCPU_SET(asid_generation,
(PCPU_GET(asid_generation) + 1) & ASIDGEN_MASK);
if (PCPU_GET(asid_generation) == 0) {
PCPU_SET(asid_generation, 1);
}
PCPU_SET(next_asid, 1); /* 0 means invalid */
}
pmap->pm_asid[PCPU_GET(cpuid)].asid = PCPU_GET(next_asid);
pmap->pm_asid[PCPU_GET(cpuid)].gen = PCPU_GET(asid_generation);
PCPU_SET(next_asid, PCPU_GET(next_asid) + 1);
}
}
int
page_is_managed(vm_paddr_t pa)
{
vm_offset_t pgnum = atop(pa);
if (pgnum >= first_page) {
vm_page_t m;
m = PHYS_TO_VM_PAGE(pa);
if (m == NULL)
return (0);
if ((m->oflags & VPO_UNMANAGED) == 0)
return (1);
}
return (0);
}
static pt_entry_t
init_pte_prot(vm_offset_t va, vm_page_t m, vm_prot_t prot)
{
pt_entry_t rw;
if (!(prot & VM_PROT_WRITE))
rw = PTE_V | PTE_RO | PTE_C_CACHE;
else if ((m->oflags & VPO_UNMANAGED) == 0) {
if ((m->md.pv_flags & PV_TABLE_MOD) != 0)
rw = PTE_V | PTE_D | PTE_C_CACHE;
else
rw = PTE_V | PTE_C_CACHE;
vm_page_aflag_set(m, PGA_WRITEABLE);
} else
/* Needn't emulate a modified bit for unmanaged pages. */
rw = PTE_V | PTE_D | PTE_C_CACHE;
return (rw);
}
/*
* pmap_emulate_modified : do dirty bit emulation
*
* On SMP, update just the local TLB, other CPUs will update their
* TLBs from PTE lazily, if they get the exception.
* Returns 0 in case of sucess, 1 if the page is read only and we
* need to fault.
*/
int
pmap_emulate_modified(pmap_t pmap, vm_offset_t va)
{
vm_page_t m;
pt_entry_t *pte;
vm_paddr_t pa;
PMAP_LOCK(pmap);
pte = pmap_pte(pmap, va);
if (pte == NULL)
panic("pmap_emulate_modified: can't find PTE");
#ifdef SMP
/* It is possible that some other CPU changed m-bit */
if (!pte_test(pte, PTE_V) || pte_test(pte, PTE_D)) {
pmap_update_page_local(pmap, va, *pte);
PMAP_UNLOCK(pmap);
return (0);
}
#else
if (!pte_test(pte, PTE_V) || pte_test(pte, PTE_D))
panic("pmap_emulate_modified: invalid pte");
#endif
if (pte_test(pte, PTE_RO)) {
/* write to read only page in the kernel */
PMAP_UNLOCK(pmap);
return (1);
}
pte_set(pte, PTE_D);
pmap_update_page_local(pmap, va, *pte);
pa = TLBLO_PTE_TO_PA(*pte);
if (!page_is_managed(pa))
panic("pmap_emulate_modified: unmanaged page");
m = PHYS_TO_VM_PAGE(pa);
m->md.pv_flags |= (PV_TABLE_REF | PV_TABLE_MOD);
PMAP_UNLOCK(pmap);
return (0);
}
/*
* Routine: pmap_kextract
* Function:
* Extract the physical page address associated
* virtual address.
*/
/* PMAP_INLINE */ vm_offset_t
pmap_kextract(vm_offset_t va)
{
int mapped;
/*
* First, the direct-mapped regions.
*/
#if defined(__mips_n64)
if (va >= MIPS_XKPHYS_START && va < MIPS_XKPHYS_END)
return (MIPS_XKPHYS_TO_PHYS(va));
#endif
if (va >= MIPS_KSEG0_START && va < MIPS_KSEG0_END)
return (MIPS_KSEG0_TO_PHYS(va));
if (va >= MIPS_KSEG1_START && va < MIPS_KSEG1_END)
return (MIPS_KSEG1_TO_PHYS(va));
/*
* User virtual addresses.
*/
if (va < VM_MAXUSER_ADDRESS) {
pt_entry_t *ptep;
if (curproc && curproc->p_vmspace) {
ptep = pmap_pte(&curproc->p_vmspace->vm_pmap, va);
if (ptep) {
return (TLBLO_PTE_TO_PA(*ptep) |
(va & PAGE_MASK));
}
return (0);
}
}
/*
* Should be kernel virtual here, otherwise fail
*/
mapped = (va >= MIPS_KSEG2_START || va < MIPS_KSEG2_END);
#if defined(__mips_n64)
mapped = mapped || (va >= MIPS_XKSEG_START || va < MIPS_XKSEG_END);
#endif
/*
* Kernel virtual.
*/
if (mapped) {
pt_entry_t *ptep;
/* Is the kernel pmap initialized? */
if (!CPU_EMPTY(&kernel_pmap->pm_active)) {
/* It's inside the virtual address range */
ptep = pmap_pte(kernel_pmap, va);
if (ptep) {
return (TLBLO_PTE_TO_PA(*ptep) |
(va & PAGE_MASK));
}
}
return (0);
}
panic("%s for unknown address space %p.", __func__, (void *)va);
}
void
pmap_flush_pvcache(vm_page_t m)
{
pv_entry_t pv;
if (m != NULL) {
for (pv = TAILQ_FIRST(&m->md.pv_list); pv;
pv = TAILQ_NEXT(pv, pv_list)) {
mips_dcache_wbinv_range_index(pv->pv_va, PAGE_SIZE);
}
}
}