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| Current File : //usr/src/sys/ia64/ia64/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) 1998,2000 Doug Rabson
* 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
* from: i386 Id: pmap.c,v 1.193 1998/04/19 15:22:48 bde Exp
* with some ideas from NetBSD's alpha pmap
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/ia64/ia64/pmap.c 226319 2011-10-12 20:08:25Z kib $");
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mman.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/smp.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <vm/vm.h>
#include <vm/vm_page.h>
#include <vm/vm_map.h>
#include <vm/vm_object.h>
#include <vm/vm_pageout.h>
#include <vm/uma.h>
#include <machine/bootinfo.h>
#include <machine/efi.h>
#include <machine/md_var.h>
#include <machine/pal.h>
/*
* 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.
*/
/*
* Following the Linux model, region IDs are allocated in groups of
* eight so that a single region ID can be used for as many RRs as we
* want by encoding the RR number into the low bits of the ID.
*
* We reserve region ID 0 for the kernel and allocate the remaining
* IDs for user pmaps.
*
* Region 0-3: User virtually mapped
* Region 4: PBVM and special mappings
* Region 5: Kernel virtual memory
* Region 6: Direct-mapped uncacheable
* Region 7: Direct-mapped cacheable
*/
/* XXX move to a header. */
extern uint64_t ia64_gateway_page[];
#ifndef PMAP_SHPGPERPROC
#define PMAP_SHPGPERPROC 200
#endif
#if !defined(DIAGNOSTIC)
#define PMAP_INLINE __inline
#else
#define PMAP_INLINE
#endif
#define pmap_accessed(lpte) ((lpte)->pte & PTE_ACCESSED)
#define pmap_dirty(lpte) ((lpte)->pte & PTE_DIRTY)
#define pmap_exec(lpte) ((lpte)->pte & PTE_AR_RX)
#define pmap_managed(lpte) ((lpte)->pte & PTE_MANAGED)
#define pmap_ppn(lpte) ((lpte)->pte & PTE_PPN_MASK)
#define pmap_present(lpte) ((lpte)->pte & PTE_PRESENT)
#define pmap_prot(lpte) (((lpte)->pte & PTE_PROT_MASK) >> 56)
#define pmap_wired(lpte) ((lpte)->pte & PTE_WIRED)
#define pmap_clear_accessed(lpte) (lpte)->pte &= ~PTE_ACCESSED
#define pmap_clear_dirty(lpte) (lpte)->pte &= ~PTE_DIRTY
#define pmap_clear_present(lpte) (lpte)->pte &= ~PTE_PRESENT
#define pmap_clear_wired(lpte) (lpte)->pte &= ~PTE_WIRED
#define pmap_set_wired(lpte) (lpte)->pte |= PTE_WIRED
/*
* The VHPT bucket head structure.
*/
struct ia64_bucket {
uint64_t chain;
struct mtx mutex;
u_int length;
};
/*
* Statically allocated kernel pmap
*/
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) */
/*
* Kernel virtual memory management.
*/
static int nkpt;
extern struct ia64_lpte ***ia64_kptdir;
#define KPTE_DIR0_INDEX(va) \
(((va) >> (3*PAGE_SHIFT-8)) & ((1<<(PAGE_SHIFT-3))-1))
#define KPTE_DIR1_INDEX(va) \
(((va) >> (2*PAGE_SHIFT-5)) & ((1<<(PAGE_SHIFT-3))-1))
#define KPTE_PTE_INDEX(va) \
(((va) >> PAGE_SHIFT) & ((1<<(PAGE_SHIFT-5))-1))
#define NKPTEPG (PAGE_SIZE / sizeof(struct ia64_lpte))
vm_offset_t kernel_vm_end;
/* Values for ptc.e. XXX values for SKI. */
static uint64_t pmap_ptc_e_base = 0x100000000;
static uint64_t pmap_ptc_e_count1 = 3;
static uint64_t pmap_ptc_e_count2 = 2;
static uint64_t pmap_ptc_e_stride1 = 0x2000;
static uint64_t pmap_ptc_e_stride2 = 0x100000000;
struct mtx pmap_ptc_mutex;
/*
* Data for the RID allocator
*/
static int pmap_ridcount;
static int pmap_rididx;
static int pmap_ridmapsz;
static int pmap_ridmax;
static uint64_t *pmap_ridmap;
struct mtx pmap_ridmutex;
/*
* Data for the pv entry allocation mechanism
*/
static uma_zone_t pvzone;
static int pv_entry_count = 0, pv_entry_max = 0, pv_entry_high_water = 0;
/*
* Data for allocating PTEs for user processes.
*/
static uma_zone_t ptezone;
/*
* Virtual Hash Page Table (VHPT) data.
*/
/* SYSCTL_DECL(_machdep); */
SYSCTL_NODE(_machdep, OID_AUTO, vhpt, CTLFLAG_RD, 0, "");
struct ia64_bucket *pmap_vhpt_bucket;
int pmap_vhpt_nbuckets;
SYSCTL_INT(_machdep_vhpt, OID_AUTO, nbuckets, CTLFLAG_RD,
&pmap_vhpt_nbuckets, 0, "");
int pmap_vhpt_log2size = 0;
TUNABLE_INT("machdep.vhpt.log2size", &pmap_vhpt_log2size);
SYSCTL_INT(_machdep_vhpt, OID_AUTO, log2size, CTLFLAG_RD,
&pmap_vhpt_log2size, 0, "");
static int pmap_vhpt_inserts;
SYSCTL_INT(_machdep_vhpt, OID_AUTO, inserts, CTLFLAG_RD,
&pmap_vhpt_inserts, 0, "");
static int pmap_vhpt_population(SYSCTL_HANDLER_ARGS);
SYSCTL_PROC(_machdep_vhpt, OID_AUTO, population, CTLTYPE_INT | CTLFLAG_RD,
NULL, 0, pmap_vhpt_population, "I", "");
static struct ia64_lpte *pmap_find_vhpt(vm_offset_t va);
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_enter_quick_locked(pmap_t pmap, vm_offset_t va,
vm_page_t m, vm_prot_t prot);
static void pmap_free_pte(struct ia64_lpte *pte, vm_offset_t va);
static void pmap_invalidate_all(void);
static int pmap_remove_pte(pmap_t pmap, struct ia64_lpte *pte,
vm_offset_t va, pv_entry_t pv, int freepte);
static int pmap_remove_vhpt(vm_offset_t va);
static boolean_t pmap_try_insert_pv_entry(pmap_t pmap, vm_offset_t va,
vm_page_t m);
vm_offset_t
pmap_steal_memory(vm_size_t size)
{
vm_size_t bank_size;
vm_offset_t pa, 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;
va = IA64_PHYS_TO_RR7(pa);
bzero((caddr_t) va, size);
return va;
}
static void
pmap_initialize_vhpt(vm_offset_t vhpt)
{
struct ia64_lpte *pte;
u_int i;
pte = (struct ia64_lpte *)vhpt;
for (i = 0; i < pmap_vhpt_nbuckets; i++) {
pte[i].pte = 0;
pte[i].itir = 0;
pte[i].tag = 1UL << 63; /* Invalid tag */
pte[i].chain = (uintptr_t)(pmap_vhpt_bucket + i);
}
}
#ifdef SMP
MALLOC_DECLARE(M_SMP);
vm_offset_t
pmap_alloc_vhpt(void)
{
vm_offset_t vhpt;
vm_size_t size;
size = 1UL << pmap_vhpt_log2size;
vhpt = (uintptr_t)contigmalloc(size, M_SMP, 0, 0UL, ~0UL, size, 0UL);
if (vhpt != 0) {
vhpt = IA64_PHYS_TO_RR7(ia64_tpa(vhpt));
pmap_initialize_vhpt(vhpt);
}
return (vhpt);
}
#endif
/*
* Bootstrap the system enough to run with virtual memory.
*/
void
pmap_bootstrap()
{
struct ia64_pal_result res;
vm_offset_t base;
size_t size;
int i, j, count, ridbits;
/*
* Query the PAL Code to find the loop parameters for the
* ptc.e instruction.
*/
res = ia64_call_pal_static(PAL_PTCE_INFO, 0, 0, 0);
if (res.pal_status != 0)
panic("Can't configure ptc.e parameters");
pmap_ptc_e_base = res.pal_result[0];
pmap_ptc_e_count1 = res.pal_result[1] >> 32;
pmap_ptc_e_count2 = res.pal_result[1] & ((1L<<32) - 1);
pmap_ptc_e_stride1 = res.pal_result[2] >> 32;
pmap_ptc_e_stride2 = res.pal_result[2] & ((1L<<32) - 1);
if (bootverbose)
printf("ptc.e base=0x%lx, count1=%ld, count2=%ld, "
"stride1=0x%lx, stride2=0x%lx\n",
pmap_ptc_e_base,
pmap_ptc_e_count1,
pmap_ptc_e_count2,
pmap_ptc_e_stride1,
pmap_ptc_e_stride2);
mtx_init(&pmap_ptc_mutex, "PTC.G mutex", NULL, MTX_SPIN);
/*
* Setup RIDs. RIDs 0..7 are reserved for the kernel.
*
* We currently need at least 19 bits in the RID because PID_MAX
* can only be encoded in 17 bits and we need RIDs for 4 regions
* per process. With PID_MAX equalling 99999 this means that we
* need to be able to encode 399996 (=4*PID_MAX).
* The Itanium processor only has 18 bits and the architected
* minimum is exactly that. So, we cannot use a PID based scheme
* in those cases. Enter pmap_ridmap...
* We should avoid the map when running on a processor that has
* implemented enough bits. This means that we should pass the
* process/thread ID to pmap. This we currently don't do, so we
* use the map anyway. However, we don't want to allocate a map
* that is large enough to cover the range dictated by the number
* of bits in the RID, because that may result in a RID map of
* 2MB in size for a 24-bit RID. A 64KB map is enough.
* The bottomline: we create a 32KB map when the processor only
* implements 18 bits (or when we can't figure it out). Otherwise
* we create a 64KB map.
*/
res = ia64_call_pal_static(PAL_VM_SUMMARY, 0, 0, 0);
if (res.pal_status != 0) {
if (bootverbose)
printf("Can't read VM Summary - assuming 18 Region ID bits\n");
ridbits = 18; /* guaranteed minimum */
} else {
ridbits = (res.pal_result[1] >> 8) & 0xff;
if (bootverbose)
printf("Processor supports %d Region ID bits\n",
ridbits);
}
if (ridbits > 19)
ridbits = 19;
pmap_ridmax = (1 << ridbits);
pmap_ridmapsz = pmap_ridmax / 64;
pmap_ridmap = (uint64_t *)pmap_steal_memory(pmap_ridmax / 8);
pmap_ridmap[0] |= 0xff;
pmap_rididx = 0;
pmap_ridcount = 8;
mtx_init(&pmap_ridmutex, "RID allocator lock", NULL, MTX_DEF);
/*
* Allocate some memory for initial kernel 'page tables'.
*/
ia64_kptdir = (void *)pmap_steal_memory(PAGE_SIZE);
nkpt = 0;
kernel_vm_end = VM_MIN_KERNEL_ADDRESS;
for (i = 0; phys_avail[i+2]; i+= 2)
;
count = i+2;
/*
* Determine a valid (mappable) VHPT size.
*/
TUNABLE_INT_FETCH("machdep.vhpt.log2size", &pmap_vhpt_log2size);
if (pmap_vhpt_log2size == 0)
pmap_vhpt_log2size = 20;
else if (pmap_vhpt_log2size < 16)
pmap_vhpt_log2size = 16;
else if (pmap_vhpt_log2size > 28)
pmap_vhpt_log2size = 28;
if (pmap_vhpt_log2size & 1)
pmap_vhpt_log2size--;
base = 0;
size = 1UL << pmap_vhpt_log2size;
for (i = 0; i < count; i += 2) {
base = (phys_avail[i] + size - 1) & ~(size - 1);
if (base + size <= phys_avail[i+1])
break;
}
if (!phys_avail[i])
panic("Unable to allocate VHPT");
if (base != phys_avail[i]) {
/* Split this region. */
for (j = count; j > i; j -= 2) {
phys_avail[j] = phys_avail[j-2];
phys_avail[j+1] = phys_avail[j-2+1];
}
phys_avail[i+1] = base;
phys_avail[i+2] = base + size;
} else
phys_avail[i] = base + size;
base = IA64_PHYS_TO_RR7(base);
PCPU_SET(md.vhpt, base);
if (bootverbose)
printf("VHPT: address=%#lx, size=%#lx\n", base, size);
pmap_vhpt_nbuckets = size / sizeof(struct ia64_lpte);
pmap_vhpt_bucket = (void *)pmap_steal_memory(pmap_vhpt_nbuckets *
sizeof(struct ia64_bucket));
for (i = 0; i < pmap_vhpt_nbuckets; i++) {
/* Stolen memory is zeroed. */
mtx_init(&pmap_vhpt_bucket[i].mutex, "VHPT bucket lock", NULL,
MTX_NOWITNESS | MTX_SPIN);
}
pmap_initialize_vhpt(base);
map_vhpt(base);
ia64_set_pta(base + (1 << 8) + (pmap_vhpt_log2size << 2) + 1);
ia64_srlz_i();
virtual_avail = VM_MIN_KERNEL_ADDRESS;
virtual_end = VM_MAX_KERNEL_ADDRESS;
/*
* Initialize the kernel pmap (which is statically allocated).
*/
PMAP_LOCK_INIT(kernel_pmap);
for (i = 0; i < IA64_VM_MINKERN_REGION; i++)
kernel_pmap->pm_rid[i] = 0;
TAILQ_INIT(&kernel_pmap->pm_pvlist);
PCPU_SET(md.current_pmap, kernel_pmap);
/* Region 5 is mapped via the VHPT. */
ia64_set_rr(IA64_RR_BASE(5), (5 << 8) | (PAGE_SHIFT << 2) | 1);
/*
* Clear out any random TLB entries left over from booting.
*/
pmap_invalidate_all();
map_gateway_page();
}
static int
pmap_vhpt_population(SYSCTL_HANDLER_ARGS)
{
int count, error, i;
count = 0;
for (i = 0; i < pmap_vhpt_nbuckets; i++)
count += pmap_vhpt_bucket[i].length;
error = SYSCTL_OUT(req, &count, sizeof(count));
return (error);
}
vm_offset_t
pmap_page_to_va(vm_page_t m)
{
vm_paddr_t pa;
vm_offset_t va;
pa = VM_PAGE_TO_PHYS(m);
va = (m->md.memattr == VM_MEMATTR_UNCACHEABLE) ? IA64_PHYS_TO_RR6(pa) :
IA64_PHYS_TO_RR7(pa);
return (va);
}
/*
* 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.memattr = VM_MEMATTR_DEFAULT;
}
/*
* 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)
{
int shpgperproc = PMAP_SHPGPERPROC;
/*
* 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);
TUNABLE_INT_FETCH("vm.pmap.shpgperproc", &shpgperproc);
pv_entry_max = shpgperproc * maxproc + cnt.v_page_count;
TUNABLE_INT_FETCH("vm.pmap.pv_entries", &pv_entry_max);
pv_entry_high_water = 9 * (pv_entry_max / 10);
ptezone = uma_zcreate("PT ENTRY", sizeof (struct ia64_lpte),
NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_VM|UMA_ZONE_NOFREE);
}
/***************************************************
* Manipulate TLBs for a pmap
***************************************************/
static void
pmap_invalidate_page(vm_offset_t va)
{
struct ia64_lpte *pte;
struct pcpu *pc;
uint64_t tag;
u_int vhpt_ofs;
critical_enter();
vhpt_ofs = ia64_thash(va) - PCPU_GET(md.vhpt);
tag = ia64_ttag(va);
STAILQ_FOREACH(pc, &cpuhead, pc_allcpu) {
pte = (struct ia64_lpte *)(pc->pc_md.vhpt + vhpt_ofs);
atomic_cmpset_64(&pte->tag, tag, 1UL << 63);
}
mtx_lock_spin(&pmap_ptc_mutex);
ia64_ptc_ga(va, PAGE_SHIFT << 2);
ia64_mf();
ia64_srlz_i();
mtx_unlock_spin(&pmap_ptc_mutex);
ia64_invala();
critical_exit();
}
static void
pmap_invalidate_all_1(void *arg)
{
uint64_t addr;
int i, j;
critical_enter();
addr = pmap_ptc_e_base;
for (i = 0; i < pmap_ptc_e_count1; i++) {
for (j = 0; j < pmap_ptc_e_count2; j++) {
ia64_ptc_e(addr);
addr += pmap_ptc_e_stride2;
}
addr += pmap_ptc_e_stride1;
}
critical_exit();
}
static void
pmap_invalidate_all(void)
{
#ifdef SMP
if (mp_ncpus > 1) {
smp_rendezvous(NULL, pmap_invalidate_all_1, NULL, NULL);
return;
}
#endif
pmap_invalidate_all_1(NULL);
}
static uint32_t
pmap_allocate_rid(void)
{
uint64_t bit, bits;
int rid;
mtx_lock(&pmap_ridmutex);
if (pmap_ridcount == pmap_ridmax)
panic("pmap_allocate_rid: All Region IDs used");
/* Find an index with a free bit. */
while ((bits = pmap_ridmap[pmap_rididx]) == ~0UL) {
pmap_rididx++;
if (pmap_rididx == pmap_ridmapsz)
pmap_rididx = 0;
}
rid = pmap_rididx * 64;
/* Find a free bit. */
bit = 1UL;
while (bits & bit) {
rid++;
bit <<= 1;
}
pmap_ridmap[pmap_rididx] |= bit;
pmap_ridcount++;
mtx_unlock(&pmap_ridmutex);
return rid;
}
static void
pmap_free_rid(uint32_t rid)
{
uint64_t bit;
int idx;
idx = rid / 64;
bit = ~(1UL << (rid & 63));
mtx_lock(&pmap_ridmutex);
pmap_ridmap[idx] &= bit;
pmap_ridcount--;
mtx_unlock(&pmap_ridmutex);
}
/***************************************************
* Page table page management routines.....
***************************************************/
void
pmap_pinit0(struct pmap *pmap)
{
/* kernel_pmap is the same as any other pmap. */
pmap_pinit(pmap);
}
/*
* Initialize a preallocated and zeroed pmap structure,
* such as one in a vmspace structure.
*/
int
pmap_pinit(struct pmap *pmap)
{
int i;
PMAP_LOCK_INIT(pmap);
for (i = 0; i < IA64_VM_MINKERN_REGION; i++)
pmap->pm_rid[i] = pmap_allocate_rid();
TAILQ_INIT(&pmap->pm_pvlist);
bzero(&pmap->pm_stats, sizeof pmap->pm_stats);
return (1);
}
/***************************************************
* 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)
{
int i;
for (i = 0; i < IA64_VM_MINKERN_REGION; i++)
if (pmap->pm_rid[i])
pmap_free_rid(pmap->pm_rid[i]);
PMAP_LOCK_DESTROY(pmap);
}
/*
* grow the number of kernel page table entries, if needed
*/
void
pmap_growkernel(vm_offset_t addr)
{
struct ia64_lpte **dir1;
struct ia64_lpte *leaf;
vm_page_t nkpg;
while (kernel_vm_end <= addr) {
if (nkpt == PAGE_SIZE/8 + PAGE_SIZE*PAGE_SIZE/64)
panic("%s: out of kernel address space", __func__);
dir1 = ia64_kptdir[KPTE_DIR0_INDEX(kernel_vm_end)];
if (dir1 == NULL) {
nkpg = vm_page_alloc(NULL, nkpt++,
VM_ALLOC_NOOBJ|VM_ALLOC_INTERRUPT|VM_ALLOC_WIRED);
if (!nkpg)
panic("%s: cannot add dir. page", __func__);
dir1 = (struct ia64_lpte **)pmap_page_to_va(nkpg);
bzero(dir1, PAGE_SIZE);
ia64_kptdir[KPTE_DIR0_INDEX(kernel_vm_end)] = dir1;
}
nkpg = vm_page_alloc(NULL, nkpt++,
VM_ALLOC_NOOBJ|VM_ALLOC_INTERRUPT|VM_ALLOC_WIRED);
if (!nkpg)
panic("%s: cannot add PTE page", __func__);
leaf = (struct ia64_lpte *)pmap_page_to_va(nkpg);
bzero(leaf, PAGE_SIZE);
dir1[KPTE_DIR1_INDEX(kernel_vm_end)] = leaf;
kernel_vm_end += PAGE_SIZE * NKPTEPG;
}
}
/***************************************************
* 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.
*/
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;
struct ia64_lpte *pte;
pmap_t oldpmap, 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--;
oldpmap = pmap_switch(pmap);
pte = pmap_find_vhpt(va);
KASSERT(pte != NULL, ("pte"));
pmap_remove_vhpt(va);
pmap_invalidate_page(va);
pmap_switch(oldpmap);
if (pmap_accessed(pte))
vm_page_aflag_set(m, PGA_REFERENCED);
if (pmap_dirty(pte))
vm_page_dirty(m);
pmap_free_pte(pte, va);
TAILQ_REMOVE(&pmap->pm_pvlist, pv, pv_plist);
m->md.pv_list_count--;
TAILQ_REMOVE(&m->md.pv_list, pv, pv_list);
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);
}
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);
}
/*
* 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;
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;
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);
}
/*
* Add an ia64_lpte to the VHPT.
*/
static void
pmap_enter_vhpt(struct ia64_lpte *pte, vm_offset_t va)
{
struct ia64_bucket *bckt;
struct ia64_lpte *vhpte;
uint64_t pte_pa;
/* Can fault, so get it out of the way. */
pte_pa = ia64_tpa((vm_offset_t)pte);
vhpte = (struct ia64_lpte *)ia64_thash(va);
bckt = (struct ia64_bucket *)vhpte->chain;
mtx_lock_spin(&bckt->mutex);
pte->chain = bckt->chain;
ia64_mf();
bckt->chain = pte_pa;
pmap_vhpt_inserts++;
bckt->length++;
mtx_unlock_spin(&bckt->mutex);
}
/*
* Remove the ia64_lpte matching va from the VHPT. Return zero if it
* worked or an appropriate error code otherwise.
*/
static int
pmap_remove_vhpt(vm_offset_t va)
{
struct ia64_bucket *bckt;
struct ia64_lpte *pte;
struct ia64_lpte *lpte;
struct ia64_lpte *vhpte;
uint64_t chain, tag;
tag = ia64_ttag(va);
vhpte = (struct ia64_lpte *)ia64_thash(va);
bckt = (struct ia64_bucket *)vhpte->chain;
lpte = NULL;
mtx_lock_spin(&bckt->mutex);
chain = bckt->chain;
pte = (struct ia64_lpte *)IA64_PHYS_TO_RR7(chain);
while (chain != 0 && pte->tag != tag) {
lpte = pte;
chain = pte->chain;
pte = (struct ia64_lpte *)IA64_PHYS_TO_RR7(chain);
}
if (chain == 0) {
mtx_unlock_spin(&bckt->mutex);
return (ENOENT);
}
/* Snip this pv_entry out of the collision chain. */
if (lpte == NULL)
bckt->chain = pte->chain;
else
lpte->chain = pte->chain;
ia64_mf();
bckt->length--;
mtx_unlock_spin(&bckt->mutex);
return (0);
}
/*
* Find the ia64_lpte for the given va, if any.
*/
static struct ia64_lpte *
pmap_find_vhpt(vm_offset_t va)
{
struct ia64_bucket *bckt;
struct ia64_lpte *pte;
uint64_t chain, tag;
tag = ia64_ttag(va);
pte = (struct ia64_lpte *)ia64_thash(va);
bckt = (struct ia64_bucket *)pte->chain;
mtx_lock_spin(&bckt->mutex);
chain = bckt->chain;
pte = (struct ia64_lpte *)IA64_PHYS_TO_RR7(chain);
while (chain != 0 && pte->tag != tag) {
chain = pte->chain;
pte = (struct ia64_lpte *)IA64_PHYS_TO_RR7(chain);
}
mtx_unlock_spin(&bckt->mutex);
return ((chain != 0) ? pte : NULL);
}
/*
* Remove an entry from the list of managed mappings.
*/
static int
pmap_remove_entry(pmap_t pmap, vm_page_t m, vm_offset_t va, pv_entry_t pv)
{
if (!pv) {
if (m->md.pv_list_count < pmap->pm_stats.resident_count) {
TAILQ_FOREACH(pv, &m->md.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) {
TAILQ_REMOVE(&m->md.pv_list, pv, pv_list);
m->md.pv_list_count--;
if (TAILQ_FIRST(&m->md.pv_list) == NULL)
vm_page_aflag_clear(m, PGA_WRITEABLE);
TAILQ_REMOVE(&pmap->pm_pvlist, pv, pv_plist);
free_pv_entry(pv);
return 0;
} else {
return ENOENT;
}
}
/*
* 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;
pv = get_pv_entry(pmap);
pv->pv_pmap = pmap;
pv->pv_va = va;
PMAP_LOCK_ASSERT(pmap, MA_OWNED);
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
TAILQ_INSERT_TAIL(&pmap->pm_pvlist, pv, pv_plist);
TAILQ_INSERT_TAIL(&m->md.pv_list, pv, pv_list);
m->md.pv_list_count++;
}
/*
* 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)
{
struct ia64_lpte *pte;
pmap_t oldpmap;
vm_paddr_t pa;
pa = 0;
PMAP_LOCK(pmap);
oldpmap = pmap_switch(pmap);
pte = pmap_find_vhpt(va);
if (pte != NULL && pmap_present(pte))
pa = pmap_ppn(pte);
pmap_switch(oldpmap);
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)
{
struct ia64_lpte *pte;
pmap_t oldpmap;
vm_page_t m;
vm_paddr_t pa;
pa = 0;
m = NULL;
PMAP_LOCK(pmap);
oldpmap = pmap_switch(pmap);
retry:
pte = pmap_find_vhpt(va);
if (pte != NULL && pmap_present(pte) &&
(pmap_prot(pte) & prot) == prot) {
m = PHYS_TO_VM_PAGE(pmap_ppn(pte));
if (vm_page_pa_tryrelock(pmap, pmap_ppn(pte), &pa))
goto retry;
vm_page_hold(m);
}
PA_UNLOCK_COND(pa);
pmap_switch(oldpmap);
PMAP_UNLOCK(pmap);
return (m);
}
/***************************************************
* Low level mapping routines.....
***************************************************/
/*
* Find the kernel lpte for mapping the given virtual address, which
* must be in the part of region 5 which we can cover with our kernel
* 'page tables'.
*/
static struct ia64_lpte *
pmap_find_kpte(vm_offset_t va)
{
struct ia64_lpte **dir1;
struct ia64_lpte *leaf;
KASSERT((va >> 61) == 5,
("kernel mapping 0x%lx not in region 5", va));
KASSERT(va < kernel_vm_end,
("kernel mapping 0x%lx out of range", va));
dir1 = ia64_kptdir[KPTE_DIR0_INDEX(va)];
leaf = dir1[KPTE_DIR1_INDEX(va)];
return (&leaf[KPTE_PTE_INDEX(va)]);
}
/*
* Find a pte suitable for mapping a user-space address. If one exists
* in the VHPT, that one will be returned, otherwise a new pte is
* allocated.
*/
static struct ia64_lpte *
pmap_find_pte(vm_offset_t va)
{
struct ia64_lpte *pte;
if (va >= VM_MAXUSER_ADDRESS)
return pmap_find_kpte(va);
pte = pmap_find_vhpt(va);
if (pte == NULL) {
pte = uma_zalloc(ptezone, M_NOWAIT | M_ZERO);
pte->tag = 1UL << 63;
}
return (pte);
}
/*
* Free a pte which is now unused. This simply returns it to the zone
* allocator if it is a user mapping. For kernel mappings, clear the
* valid bit to make it clear that the mapping is not currently used.
*/
static void
pmap_free_pte(struct ia64_lpte *pte, vm_offset_t va)
{
if (va < VM_MAXUSER_ADDRESS)
uma_zfree(ptezone, pte);
else
pmap_clear_present(pte);
}
static PMAP_INLINE void
pmap_pte_prot(pmap_t pm, struct ia64_lpte *pte, vm_prot_t prot)
{
static long prot2ar[4] = {
PTE_AR_R, /* VM_PROT_NONE */
PTE_AR_RW, /* VM_PROT_WRITE */
PTE_AR_RX|PTE_ED, /* VM_PROT_EXECUTE */
PTE_AR_RWX|PTE_ED /* VM_PROT_WRITE|VM_PROT_EXECUTE */
};
pte->pte &= ~(PTE_PROT_MASK | PTE_PL_MASK | PTE_AR_MASK | PTE_ED);
pte->pte |= (uint64_t)(prot & VM_PROT_ALL) << 56;
pte->pte |= (prot == VM_PROT_NONE || pm == kernel_pmap)
? PTE_PL_KERN : PTE_PL_USER;
pte->pte |= prot2ar[(prot & VM_PROT_ALL) >> 1];
}
static PMAP_INLINE void
pmap_pte_attr(struct ia64_lpte *pte, vm_memattr_t ma)
{
pte->pte &= ~PTE_MA_MASK;
pte->pte |= (ma & PTE_MA_MASK);
}
/*
* Set a pte to contain a valid mapping and enter it in the VHPT. If
* the pte was orginally valid, then its assumed to already be in the
* VHPT.
* This functions does not set the protection bits. It's expected
* that those have been set correctly prior to calling this function.
*/
static void
pmap_set_pte(struct ia64_lpte *pte, vm_offset_t va, vm_offset_t pa,
boolean_t wired, boolean_t managed)
{
pte->pte &= PTE_PROT_MASK | PTE_MA_MASK | PTE_PL_MASK |
PTE_AR_MASK | PTE_ED;
pte->pte |= PTE_PRESENT;
pte->pte |= (managed) ? PTE_MANAGED : (PTE_DIRTY | PTE_ACCESSED);
pte->pte |= (wired) ? PTE_WIRED : 0;
pte->pte |= pa & PTE_PPN_MASK;
pte->itir = PAGE_SHIFT << 2;
pte->tag = ia64_ttag(va);
}
/*
* Remove the (possibly managed) mapping represented by pte from the
* given pmap.
*/
static int
pmap_remove_pte(pmap_t pmap, struct ia64_lpte *pte, vm_offset_t va,
pv_entry_t pv, int freepte)
{
int error;
vm_page_t m;
/*
* First remove from the VHPT.
*/
error = pmap_remove_vhpt(va);
if (error)
return (error);
pmap_invalidate_page(va);
if (pmap_wired(pte))
pmap->pm_stats.wired_count -= 1;
pmap->pm_stats.resident_count -= 1;
if (pmap_managed(pte)) {
m = PHYS_TO_VM_PAGE(pmap_ppn(pte));
if (pmap_dirty(pte))
vm_page_dirty(m);
if (pmap_accessed(pte))
vm_page_aflag_set(m, PGA_REFERENCED);
error = pmap_remove_entry(pmap, m, va, pv);
}
if (freepte)
pmap_free_pte(pte, va);
return (error);
}
/*
* Extract the physical page address associated with a kernel
* virtual address.
*/
vm_paddr_t
pmap_kextract(vm_offset_t va)
{
struct ia64_lpte *pte;
uint64_t *pbvm_pgtbl;
vm_paddr_t pa;
u_int idx;
KASSERT(va >= VM_MAXUSER_ADDRESS, ("Must be kernel VA"));
/* Regions 6 and 7 are direct mapped. */
if (va >= IA64_RR_BASE(6)) {
pa = IA64_RR_MASK(va);
goto out;
}
/* Region 5 is our KVA. Bail out if the VA is beyond our limits. */
if (va >= kernel_vm_end)
goto err_out;
if (va >= VM_MIN_KERNEL_ADDRESS) {
pte = pmap_find_kpte(va);
pa = pmap_present(pte) ? pmap_ppn(pte) | (va & PAGE_MASK) : 0;
goto out;
}
/* The PBVM page table. */
if (va >= IA64_PBVM_PGTBL + bootinfo->bi_pbvm_pgtblsz)
goto err_out;
if (va >= IA64_PBVM_PGTBL) {
pa = (va - IA64_PBVM_PGTBL) + bootinfo->bi_pbvm_pgtbl;
goto out;
}
/* The PBVM itself. */
if (va >= IA64_PBVM_BASE) {
pbvm_pgtbl = (void *)IA64_PBVM_PGTBL;
idx = (va - IA64_PBVM_BASE) >> IA64_PBVM_PAGE_SHIFT;
if (idx >= (bootinfo->bi_pbvm_pgtblsz >> 3))
goto err_out;
if ((pbvm_pgtbl[idx] & PTE_PRESENT) == 0)
goto err_out;
pa = (pbvm_pgtbl[idx] & PTE_PPN_MASK) +
(va & IA64_PBVM_PAGE_MASK);
goto out;
}
err_out:
printf("XXX: %s: va=%#lx is invalid\n", __func__, va);
pa = 0;
/* FALLTHROUGH */
out:
return (pa);
}
/*
* 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 is effectively wired, but it's customary to not have
* the PTE reflect that, nor update statistics.
*/
void
pmap_qenter(vm_offset_t va, vm_page_t *m, int count)
{
struct ia64_lpte *pte;
int i;
for (i = 0; i < count; i++) {
pte = pmap_find_kpte(va);
if (pmap_present(pte))
pmap_invalidate_page(va);
else
pmap_enter_vhpt(pte, va);
pmap_pte_prot(kernel_pmap, pte, VM_PROT_ALL);
pmap_pte_attr(pte, m[i]->md.memattr);
pmap_set_pte(pte, va, VM_PAGE_TO_PHYS(m[i]), FALSE, FALSE);
va += PAGE_SIZE;
}
}
/*
* this routine jerks page mappings from the
* kernel -- it is meant only for temporary mappings.
*/
void
pmap_qremove(vm_offset_t va, int count)
{
struct ia64_lpte *pte;
int i;
for (i = 0; i < count; i++) {
pte = pmap_find_kpte(va);
if (pmap_present(pte)) {
pmap_remove_vhpt(va);
pmap_invalidate_page(va);
pmap_clear_present(pte);
}
va += PAGE_SIZE;
}
}
/*
* Add a wired page to the kva. As for pmap_qenter(), it's customary
* to not have the PTE reflect that, nor update statistics.
*/
void
pmap_kenter(vm_offset_t va, vm_offset_t pa)
{
struct ia64_lpte *pte;
pte = pmap_find_kpte(va);
if (pmap_present(pte))
pmap_invalidate_page(va);
else
pmap_enter_vhpt(pte, va);
pmap_pte_prot(kernel_pmap, pte, VM_PROT_ALL);
pmap_pte_attr(pte, VM_MEMATTR_DEFAULT);
pmap_set_pte(pte, va, pa, FALSE, FALSE);
}
/*
* Remove a page from the kva
*/
void
pmap_kremove(vm_offset_t va)
{
struct ia64_lpte *pte;
pte = pmap_find_kpte(va);
if (pmap_present(pte)) {
pmap_remove_vhpt(va);
pmap_invalidate_page(va);
pmap_clear_present(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_offset_t start, vm_offset_t end, int prot)
{
return IA64_PHYS_TO_RR7(start);
}
/*
* 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)
{
pmap_t oldpmap;
vm_offset_t va;
pv_entry_t npv, pv;
struct ia64_lpte *pte;
if (pmap->pm_stats.resident_count == 0)
return;
vm_page_lock_queues();
PMAP_LOCK(pmap);
oldpmap = pmap_switch(pmap);
/*
* special handling of removing one page. a very
* common operation and easy to short circuit some
* code.
*/
if (sva + PAGE_SIZE == eva) {
pte = pmap_find_vhpt(sva);
if (pte != NULL)
pmap_remove_pte(pmap, pte, sva, 0, 1);
goto out;
}
if (pmap->pm_stats.resident_count < ((eva - sva) >> PAGE_SHIFT)) {
TAILQ_FOREACH_SAFE(pv, &pmap->pm_pvlist, pv_plist, npv) {
va = pv->pv_va;
if (va >= sva && va < eva) {
pte = pmap_find_vhpt(va);
KASSERT(pte != NULL, ("pte"));
pmap_remove_pte(pmap, pte, va, pv, 1);
}
}
} else {
for (va = sva; va < eva; va += PAGE_SIZE) {
pte = pmap_find_vhpt(va);
if (pte != NULL)
pmap_remove_pte(pmap, pte, va, 0, 1);
}
}
out:
vm_page_unlock_queues();
pmap_switch(oldpmap);
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)
{
pmap_t oldpmap;
pv_entry_t pv;
KASSERT((m->oflags & VPO_UNMANAGED) == 0,
("pmap_remove_all: page %p is not managed", m));
vm_page_lock_queues();
while ((pv = TAILQ_FIRST(&m->md.pv_list)) != NULL) {
struct ia64_lpte *pte;
pmap_t pmap = pv->pv_pmap;
vm_offset_t va = pv->pv_va;
PMAP_LOCK(pmap);
oldpmap = pmap_switch(pmap);
pte = pmap_find_vhpt(va);
KASSERT(pte != NULL, ("pte"));
if (pmap_ppn(pte) != VM_PAGE_TO_PHYS(m))
panic("pmap_remove_all: pv_table for %lx is inconsistent", VM_PAGE_TO_PHYS(m));
pmap_remove_pte(pmap, pte, va, pv, 1);
pmap_switch(oldpmap);
PMAP_UNLOCK(pmap);
}
vm_page_aflag_clear(m, PGA_WRITEABLE);
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)
{
pmap_t oldpmap;
struct ia64_lpte *pte;
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;
if ((sva & PAGE_MASK) || (eva & PAGE_MASK))
panic("pmap_protect: unaligned addresses");
PMAP_LOCK(pmap);
oldpmap = pmap_switch(pmap);
for ( ; sva < eva; sva += PAGE_SIZE) {
/* If page is invalid, skip this page */
pte = pmap_find_vhpt(sva);
if (pte == NULL)
continue;
/* If there's no change, skip it too */
if (pmap_prot(pte) == prot)
continue;
if ((prot & VM_PROT_WRITE) == 0 &&
pmap_managed(pte) && pmap_dirty(pte)) {
vm_paddr_t pa = pmap_ppn(pte);
vm_page_t m = PHYS_TO_VM_PAGE(pa);
vm_page_dirty(m);
pmap_clear_dirty(pte);
}
if (prot & VM_PROT_EXECUTE)
ia64_sync_icache(sva, PAGE_SIZE);
pmap_pte_prot(pmap, pte, prot);
pmap_invalidate_page(sva);
}
pmap_switch(oldpmap);
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)
{
pmap_t oldpmap;
vm_offset_t pa;
vm_offset_t opa;
struct ia64_lpte origpte;
struct ia64_lpte *pte;
boolean_t icache_inval, managed;
vm_page_lock_queues();
PMAP_LOCK(pmap);
oldpmap = pmap_switch(pmap);
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));
/*
* Find (or create) a pte for the given mapping.
*/
while ((pte = pmap_find_pte(va)) == NULL) {
pmap_switch(oldpmap);
PMAP_UNLOCK(pmap);
vm_page_unlock_queues();
VM_WAIT;
vm_page_lock_queues();
PMAP_LOCK(pmap);
oldpmap = pmap_switch(pmap);
}
origpte = *pte;
if (!pmap_present(pte)) {
opa = ~0UL;
pmap_enter_vhpt(pte, va);
} else
opa = pmap_ppn(pte);
managed = FALSE;
pa = VM_PAGE_TO_PHYS(m);
icache_inval = (prot & VM_PROT_EXECUTE) ? TRUE : FALSE;
/*
* Mapping has not changed, must be protection or wiring change.
*/
if (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 && !pmap_wired(&origpte))
pmap->pm_stats.wired_count++;
else if (!wired && pmap_wired(&origpte))
pmap->pm_stats.wired_count--;
managed = (pmap_managed(&origpte)) ? TRUE : FALSE;
/*
* We might be turning off write access to the page,
* so we go ahead and sense modify status. Otherwise,
* we can avoid I-cache invalidation if the page
* already allowed execution.
*/
if (managed && pmap_dirty(&origpte))
vm_page_dirty(m);
else if (pmap_exec(&origpte))
icache_inval = FALSE;
pmap_invalidate_page(va);
goto validate;
}
/*
* Mapping has changed, invalidate old range and fall
* through to handle validating new mapping.
*/
if (opa != ~0UL) {
pmap_remove_pte(pmap, pte, va, 0, 0);
pmap_enter_vhpt(pte, va);
}
/*
* 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"));
pmap_insert_entry(pmap, va, m);
managed = TRUE;
}
/*
* Increment counters
*/
pmap->pm_stats.resident_count++;
if (wired)
pmap->pm_stats.wired_count++;
validate:
/*
* Now validate mapping with desired protection/wiring. This
* adds the pte to the VHPT if necessary.
*/
pmap_pte_prot(pmap, pte, prot);
pmap_pte_attr(pte, m->md.memattr);
pmap_set_pte(pte, va, pa, wired, managed);
/* Invalidate the I-cache when needed. */
if (icache_inval)
ia64_sync_icache(va, PAGE_SIZE);
if ((prot & VM_PROT_WRITE) != 0 && managed)
vm_page_aflag_set(m, PGA_WRITEABLE);
vm_page_unlock_queues();
pmap_switch(oldpmap);
PMAP_UNLOCK(pmap);
}
/*
* 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)
{
pmap_t oldpmap;
vm_page_t m;
vm_pindex_t diff, psize;
VM_OBJECT_LOCK_ASSERT(m_start->object, MA_OWNED);
psize = atop(end - start);
m = m_start;
vm_page_lock_queues();
PMAP_LOCK(pmap);
oldpmap = pmap_switch(pmap);
while (m != NULL && (diff = m->pindex - m_start->pindex) < psize) {
pmap_enter_quick_locked(pmap, start + ptoa(diff), m, prot);
m = TAILQ_NEXT(m, listq);
}
vm_page_unlock_queues();
pmap_switch(oldpmap);
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)
{
pmap_t oldpmap;
vm_page_lock_queues();
PMAP_LOCK(pmap);
oldpmap = pmap_switch(pmap);
pmap_enter_quick_locked(pmap, va, m, prot);
vm_page_unlock_queues();
pmap_switch(oldpmap);
PMAP_UNLOCK(pmap);
}
static void
pmap_enter_quick_locked(pmap_t pmap, vm_offset_t va, vm_page_t m,
vm_prot_t prot)
{
struct ia64_lpte *pte;
boolean_t managed;
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);
if ((pte = pmap_find_pte(va)) == NULL)
return;
if (!pmap_present(pte)) {
/* Enter on the PV list if the page is managed. */
if ((m->oflags & VPO_UNMANAGED) == 0) {
if (!pmap_try_insert_pv_entry(pmap, va, m)) {
pmap_free_pte(pte, va);
return;
}
managed = TRUE;
} else
managed = FALSE;
/* Increment counters. */
pmap->pm_stats.resident_count++;
/* Initialise with R/O protection and enter into VHPT. */
pmap_enter_vhpt(pte, va);
pmap_pte_prot(pmap, pte,
prot & (VM_PROT_READ | VM_PROT_EXECUTE));
pmap_pte_attr(pte, m->md.memattr);
pmap_set_pte(pte, va, VM_PAGE_TO_PHYS(m), FALSE, managed);
if (prot & VM_PROT_EXECUTE)
ia64_sync_icache(va, PAGE_SIZE);
}
}
/*
* 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, va, wired)
register pmap_t pmap;
vm_offset_t va;
boolean_t wired;
{
pmap_t oldpmap;
struct ia64_lpte *pte;
PMAP_LOCK(pmap);
oldpmap = pmap_switch(pmap);
pte = pmap_find_vhpt(va);
KASSERT(pte != NULL, ("pte"));
if (wired && !pmap_wired(pte)) {
pmap->pm_stats.wired_count++;
pmap_set_wired(pte);
} else if (!wired && pmap_wired(pte)) {
pmap->pm_stats.wired_count--;
pmap_clear_wired(pte);
}
pmap_switch(oldpmap);
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 it into virtual memory and using bzero to clear
* its contents.
*/
void
pmap_zero_page(vm_page_t m)
{
void *p;
p = (void *)pmap_page_to_va(m);
bzero(p, PAGE_SIZE);
}
/*
* pmap_zero_page_area zeros the specified hardware page by
* mapping it into virtual memory and using bzero to clear
* its contents.
*
* off and size must reside within a single page.
*/
void
pmap_zero_page_area(vm_page_t m, int off, int size)
{
char *p;
p = (void *)pmap_page_to_va(m);
bzero(p + off, size);
}
/*
* pmap_zero_page_idle zeros the specified hardware page by
* mapping it into virtual memory and using bzero to clear
* its contents. This is for the vm_idlezero process.
*/
void
pmap_zero_page_idle(vm_page_t m)
{
void *p;
p = (void *)pmap_page_to_va(m);
bzero(p, PAGE_SIZE);
}
/*
* 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)
{
void *dst, *src;
src = (void *)pmap_page_to_va(msrc);
dst = (void *)pmap_page_to_va(mdst);
bcopy(src, dst, PAGE_SIZE);
}
/*
* 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);
}
/*
* 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)
{
struct ia64_lpte *pte;
pmap_t oldpmap, pmap;
pv_entry_t pv;
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);
oldpmap = pmap_switch(pmap);
pte = pmap_find_vhpt(pv->pv_va);
KASSERT(pte != NULL, ("pte"));
if (pmap_wired(pte))
count++;
pmap_switch(oldpmap);
PMAP_UNLOCK(pmap);
}
vm_page_unlock_queues();
return (count);
}
/*
* 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)
{
pmap_t oldpmap;
pv_entry_t pv, npv;
if (pmap != vmspace_pmap(curthread->td_proc->p_vmspace)) {
printf("warning: %s called with non-current pmap\n",
__func__);
return;
}
vm_page_lock_queues();
PMAP_LOCK(pmap);
oldpmap = pmap_switch(pmap);
for (pv = TAILQ_FIRST(&pmap->pm_pvlist); pv; pv = npv) {
struct ia64_lpte *pte;
npv = TAILQ_NEXT(pv, pv_plist);
pte = pmap_find_vhpt(pv->pv_va);
KASSERT(pte != NULL, ("pte"));
if (!pmap_wired(pte))
pmap_remove_pte(pmap, pte, pv->pv_va, pv, 1);
}
pmap_switch(oldpmap);
PMAP_UNLOCK(pmap);
vm_page_unlock_queues();
}
/*
* 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 ia64_lpte *pte;
pmap_t oldpmap;
pv_entry_t pv;
int count = 0;
KASSERT((m->oflags & VPO_UNMANAGED) == 0,
("pmap_ts_referenced: page %p is not managed", m));
vm_page_lock_queues();
TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) {
PMAP_LOCK(pv->pv_pmap);
oldpmap = pmap_switch(pv->pv_pmap);
pte = pmap_find_vhpt(pv->pv_va);
KASSERT(pte != NULL, ("pte"));
if (pmap_accessed(pte)) {
count++;
pmap_clear_accessed(pte);
pmap_invalidate_page(pv->pv_va);
}
pmap_switch(oldpmap);
PMAP_UNLOCK(pv->pv_pmap);
}
vm_page_unlock_queues();
return (count);
}
/*
* 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)
{
struct ia64_lpte *pte;
pmap_t oldpmap;
pv_entry_t pv;
boolean_t rv;
KASSERT((m->oflags & VPO_UNMANAGED) == 0,
("pmap_is_modified: page %p is not managed", m));
rv = FALSE;
/*
* 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 be dirty.
*/
VM_OBJECT_LOCK_ASSERT(m->object, MA_OWNED);
if ((m->oflags & VPO_BUSY) == 0 &&
(m->aflags & PGA_WRITEABLE) == 0)
return (rv);
vm_page_lock_queues();
TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) {
PMAP_LOCK(pv->pv_pmap);
oldpmap = pmap_switch(pv->pv_pmap);
pte = pmap_find_vhpt(pv->pv_va);
pmap_switch(oldpmap);
KASSERT(pte != NULL, ("pte"));
rv = pmap_dirty(pte) ? TRUE : FALSE;
PMAP_UNLOCK(pv->pv_pmap);
if (rv)
break;
}
vm_page_unlock_queues();
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)
{
struct ia64_lpte *pte;
pte = pmap_find_vhpt(addr);
if (pte != NULL && pmap_present(pte))
return (FALSE);
return (TRUE);
}
/*
* 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)
{
struct ia64_lpte *pte;
pmap_t oldpmap;
pv_entry_t pv;
boolean_t rv;
KASSERT((m->oflags & VPO_UNMANAGED) == 0,
("pmap_is_referenced: page %p is not managed", m));
rv = FALSE;
vm_page_lock_queues();
TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) {
PMAP_LOCK(pv->pv_pmap);
oldpmap = pmap_switch(pv->pv_pmap);
pte = pmap_find_vhpt(pv->pv_va);
pmap_switch(oldpmap);
KASSERT(pte != NULL, ("pte"));
rv = pmap_accessed(pte) ? TRUE : FALSE;
PMAP_UNLOCK(pv->pv_pmap);
if (rv)
break;
}
vm_page_unlock_queues();
return (rv);
}
/*
* Clear the modify bits on the specified physical page.
*/
void
pmap_clear_modify(vm_page_t m)
{
struct ia64_lpte *pte;
pmap_t oldpmap;
pv_entry_t pv;
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 be modified.
* 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();
TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) {
PMAP_LOCK(pv->pv_pmap);
oldpmap = pmap_switch(pv->pv_pmap);
pte = pmap_find_vhpt(pv->pv_va);
KASSERT(pte != NULL, ("pte"));
if (pmap_dirty(pte)) {
pmap_clear_dirty(pte);
pmap_invalidate_page(pv->pv_va);
}
pmap_switch(oldpmap);
PMAP_UNLOCK(pv->pv_pmap);
}
vm_page_unlock_queues();
}
/*
* pmap_clear_reference:
*
* Clear the reference bit on the specified physical page.
*/
void
pmap_clear_reference(vm_page_t m)
{
struct ia64_lpte *pte;
pmap_t oldpmap;
pv_entry_t pv;
KASSERT((m->oflags & VPO_UNMANAGED) == 0,
("pmap_clear_reference: page %p is not managed", m));
vm_page_lock_queues();
TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) {
PMAP_LOCK(pv->pv_pmap);
oldpmap = pmap_switch(pv->pv_pmap);
pte = pmap_find_vhpt(pv->pv_va);
KASSERT(pte != NULL, ("pte"));
if (pmap_accessed(pte)) {
pmap_clear_accessed(pte);
pmap_invalidate_page(pv->pv_va);
}
pmap_switch(oldpmap);
PMAP_UNLOCK(pv->pv_pmap);
}
vm_page_unlock_queues();
}
/*
* Clear the write and modified bits in each of the given page's mappings.
*/
void
pmap_remove_write(vm_page_t m)
{
struct ia64_lpte *pte;
pmap_t oldpmap, pmap;
pv_entry_t pv;
vm_prot_t prot;
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;
vm_page_lock_queues();
TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) {
pmap = pv->pv_pmap;
PMAP_LOCK(pmap);
oldpmap = pmap_switch(pmap);
pte = pmap_find_vhpt(pv->pv_va);
KASSERT(pte != NULL, ("pte"));
prot = pmap_prot(pte);
if ((prot & VM_PROT_WRITE) != 0) {
if (pmap_dirty(pte)) {
vm_page_dirty(m);
pmap_clear_dirty(pte);
}
prot &= ~VM_PROT_WRITE;
pmap_pte_prot(pmap, pte, prot);
pmap_pte_attr(pte, m->md.memattr);
pmap_invalidate_page(pv->pv_va);
}
pmap_switch(oldpmap);
PMAP_UNLOCK(pmap);
}
vm_page_aflag_clear(m, PGA_WRITEABLE);
vm_page_unlock_queues();
}
/*
* 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(vm_paddr_t pa, vm_size_t sz)
{
static void *last_va = NULL;
static vm_paddr_t last_pa = 0;
static vm_size_t last_sz = 0;
struct efi_md *md;
vm_offset_t va;
if (pa == last_pa && sz == last_sz)
return (last_va);
md = efi_md_find(pa);
if (md == NULL) {
printf("%s: [%#lx..%#lx] not covered by memory descriptor\n",
__func__, pa, pa + sz - 1);
return (NULL);
}
if (md->md_type == EFI_MD_TYPE_FREE) {
printf("%s: [%#lx..%#lx] is in DRAM\n", __func__, pa,
pa + sz - 1);
return (NULL);
}
va = (md->md_attr & EFI_MD_ATTR_WB) ? IA64_PHYS_TO_RR7(pa) :
IA64_PHYS_TO_RR6(pa);
last_va = (void *)va;
last_pa = pa;
last_sz = sz;
return (last_va);
}
/*
* 'Unmap' a range mapped by pmap_mapdev().
*/
void
pmap_unmapdev(vm_offset_t va, vm_size_t size)
{
}
/*
* Sets the memory attribute for the specified page.
*/
static void
pmap_page_set_memattr_1(void *arg)
{
struct ia64_pal_result res;
register_t is;
uintptr_t pp = (uintptr_t)arg;
is = intr_disable();
res = ia64_call_pal_static(pp, 0, 0, 0);
intr_restore(is);
}
void
pmap_page_set_memattr(vm_page_t m, vm_memattr_t ma)
{
struct ia64_lpte *pte;
pmap_t oldpmap;
pv_entry_t pv;
void *va;
vm_page_lock_queues();
m->md.memattr = ma;
TAILQ_FOREACH(pv, &m->md.pv_list, pv_list) {
PMAP_LOCK(pv->pv_pmap);
oldpmap = pmap_switch(pv->pv_pmap);
pte = pmap_find_vhpt(pv->pv_va);
KASSERT(pte != NULL, ("pte"));
pmap_pte_attr(pte, ma);
pmap_invalidate_page(pv->pv_va);
pmap_switch(oldpmap);
PMAP_UNLOCK(pv->pv_pmap);
}
vm_page_unlock_queues();
if (ma == VM_MEMATTR_UNCACHEABLE) {
#ifdef SMP
smp_rendezvous(NULL, pmap_page_set_memattr_1, NULL,
(void *)PAL_PREFETCH_VISIBILITY);
#else
pmap_page_set_memattr_1((void *)PAL_PREFETCH_VISIBILITY);
#endif
va = (void *)pmap_page_to_va(m);
critical_enter();
cpu_flush_dcache(va, PAGE_SIZE);
critical_exit();
#ifdef SMP
smp_rendezvous(NULL, pmap_page_set_memattr_1, NULL,
(void *)PAL_MC_DRAIN);
#else
pmap_page_set_memattr_1((void *)PAL_MC_DRAIN);
#endif
}
}
/*
* perform the pmap work for mincore
*/
int
pmap_mincore(pmap_t pmap, vm_offset_t addr, vm_paddr_t *locked_pa)
{
pmap_t oldpmap;
struct ia64_lpte *pte, tpte;
vm_paddr_t pa;
int val;
PMAP_LOCK(pmap);
retry:
oldpmap = pmap_switch(pmap);
pte = pmap_find_vhpt(addr);
if (pte != NULL) {
tpte = *pte;
pte = &tpte;
}
pmap_switch(oldpmap);
if (pte == NULL || !pmap_present(pte)) {
val = 0;
goto out;
}
val = MINCORE_INCORE;
if (pmap_dirty(pte))
val |= MINCORE_MODIFIED | MINCORE_MODIFIED_OTHER;
if (pmap_accessed(pte))
val |= MINCORE_REFERENCED | MINCORE_REFERENCED_OTHER;
if ((val & (MINCORE_MODIFIED_OTHER | MINCORE_REFERENCED_OTHER)) !=
(MINCORE_MODIFIED_OTHER | MINCORE_REFERENCED_OTHER) &&
pmap_managed(pte)) {
pa = pmap_ppn(pte);
/* 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_switch(vmspace_pmap(td->td_proc->p_vmspace));
}
pmap_t
pmap_switch(pmap_t pm)
{
pmap_t prevpm;
int i;
critical_enter();
prevpm = PCPU_GET(md.current_pmap);
if (prevpm == pm)
goto out;
if (pm == NULL) {
for (i = 0; i < IA64_VM_MINKERN_REGION; i++) {
ia64_set_rr(IA64_RR_BASE(i),
(i << 8)|(PAGE_SHIFT << 2)|1);
}
} else {
for (i = 0; i < IA64_VM_MINKERN_REGION; i++) {
ia64_set_rr(IA64_RR_BASE(i),
(pm->pm_rid[i] << 8)|(PAGE_SHIFT << 2)|1);
}
}
PCPU_SET(md.current_pmap, pm);
ia64_srlz_d();
out:
critical_exit();
return (prevpm);
}
void
pmap_sync_icache(pmap_t pm, vm_offset_t va, vm_size_t sz)
{
pmap_t oldpm;
struct ia64_lpte *pte;
vm_offset_t lim;
vm_size_t len;
sz += va & 31;
va &= ~31;
sz = (sz + 31) & ~31;
PMAP_LOCK(pm);
oldpm = pmap_switch(pm);
while (sz > 0) {
lim = round_page(va);
len = MIN(lim - va, sz);
pte = pmap_find_vhpt(va);
if (pte != NULL && pmap_present(pte))
ia64_sync_icache(va, len);
va += len;
sz -= len;
}
pmap_switch(oldpm);
PMAP_UNLOCK(pm);
}
/*
* 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)
{
}
#include "opt_ddb.h"
#ifdef DDB
#include <ddb/ddb.h>
static const char* psnames[] = {
"1B", "2B", "4B", "8B",
"16B", "32B", "64B", "128B",
"256B", "512B", "1K", "2K",
"4K", "8K", "16K", "32K",
"64K", "128K", "256K", "512K",
"1M", "2M", "4M", "8M",
"16M", "32M", "64M", "128M",
"256M", "512M", "1G", "2G"
};
static void
print_trs(int type)
{
struct ia64_pal_result res;
int i, maxtr;
struct {
pt_entry_t pte;
uint64_t itir;
uint64_t ifa;
struct ia64_rr rr;
} buf;
static const char *manames[] = {
"WB", "bad", "bad", "bad",
"UC", "UCE", "WC", "NaT",
};
res = ia64_call_pal_static(PAL_VM_SUMMARY, 0, 0, 0);
if (res.pal_status != 0) {
db_printf("Can't get VM summary\n");
return;
}
if (type == 0)
maxtr = (res.pal_result[0] >> 40) & 0xff;
else
maxtr = (res.pal_result[0] >> 32) & 0xff;
db_printf("V RID Virtual Page Physical Page PgSz ED AR PL D A MA P KEY\n");
for (i = 0; i <= maxtr; i++) {
bzero(&buf, sizeof(buf));
res = ia64_pal_physical(PAL_VM_TR_READ, i, type,
ia64_tpa((uint64_t)&buf));
if (!(res.pal_result[0] & 1))
buf.pte &= ~PTE_AR_MASK;
if (!(res.pal_result[0] & 2))
buf.pte &= ~PTE_PL_MASK;
if (!(res.pal_result[0] & 4))
pmap_clear_dirty(&buf);
if (!(res.pal_result[0] & 8))
buf.pte &= ~PTE_MA_MASK;
db_printf("%d %06x %013lx %013lx %4s %d %d %d %d %d %-3s "
"%d %06x\n", (int)buf.ifa & 1, buf.rr.rr_rid,
buf.ifa >> 12, (buf.pte & PTE_PPN_MASK) >> 12,
psnames[(buf.itir & ITIR_PS_MASK) >> 2],
(buf.pte & PTE_ED) ? 1 : 0,
(int)(buf.pte & PTE_AR_MASK) >> 9,
(int)(buf.pte & PTE_PL_MASK) >> 7,
(pmap_dirty(&buf)) ? 1 : 0,
(pmap_accessed(&buf)) ? 1 : 0,
manames[(buf.pte & PTE_MA_MASK) >> 2],
(pmap_present(&buf)) ? 1 : 0,
(int)((buf.itir & ITIR_KEY_MASK) >> 8));
}
}
DB_COMMAND(itr, db_itr)
{
print_trs(0);
}
DB_COMMAND(dtr, db_dtr)
{
print_trs(1);
}
DB_COMMAND(rr, db_rr)
{
int i;
uint64_t t;
struct ia64_rr rr;
printf("RR RID PgSz VE\n");
for (i = 0; i < 8; i++) {
__asm __volatile ("mov %0=rr[%1]"
: "=r"(t)
: "r"(IA64_RR_BASE(i)));
*(uint64_t *) &rr = t;
printf("%d %06x %4s %d\n",
i, rr.rr_rid, psnames[rr.rr_ps], rr.rr_ve);
}
}
DB_COMMAND(thash, db_thash)
{
if (!have_addr)
return;
db_printf("%p\n", (void *) ia64_thash(addr));
}
DB_COMMAND(ttag, db_ttag)
{
if (!have_addr)
return;
db_printf("0x%lx\n", ia64_ttag(addr));
}
DB_COMMAND(kpte, db_kpte)
{
struct ia64_lpte *pte;
if (!have_addr) {
db_printf("usage: kpte <kva>\n");
return;
}
if (addr < VM_MIN_KERNEL_ADDRESS) {
db_printf("kpte: error: invalid <kva>\n");
return;
}
pte = pmap_find_kpte(addr);
db_printf("kpte at %p:\n", pte);
db_printf(" pte =%016lx\n", pte->pte);
db_printf(" itir =%016lx\n", pte->itir);
db_printf(" tag =%016lx\n", pte->tag);
db_printf(" chain=%016lx\n", pte->chain);
}
#endif