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Implement va->pa translation for kernel virtual addresses. This is

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untested - it only seems to be used for crashdumps.
This commit is contained in:
dfr 2001-10-25 09:08:21 +00:00
parent 8389cc7d50
commit a6c75aa816
1 changed files with 59 additions and 30 deletions
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89
lib/libkvm/kvm_ia64.c
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@ -51,14 +51,12 @@
static off_t _kvm_pa2off(kvm_t *kd, u_long pa);
struct vmstate {
u_int64_t lev1map_pa; /* PA of Lev1map */
u_int64_t page_size; /* Page size */
u_int64_t nmemsegs; /* Number of RAM segm */
u_int64_t kptdir; /* PA of page table directory */
u_int64_t page_size; /* Page size */
};
void
_kvm_freevtop(kd)
kvm_t *kd;
_kvm_freevtop(kvm_t *kd)
{
/* Not actually used for anything right now, but safe. */
@ -67,12 +65,11 @@ _kvm_freevtop(kd)
}
int
_kvm_initvtop(kd)
kvm_t *kd;
_kvm_initvtop(kvm_t *kd)
{
struct vmstate *vm;
struct nlist nlist[2];
u_long pa;
u_int64_t va;
vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm));
if (vm == 0) {
@ -80,9 +77,9 @@ _kvm_initvtop(kd)
return (-1);
}
kd->vmst = vm;
vm->page_size = PAGE_SIZE;
vm->page_size = getpagesize(); /* XXX wrong for crashdumps */
nlist[0].n_name = "_Lev1map";
nlist[0].n_name = "kptdir";
nlist[1].n_name = 0;
if (kvm_nlist(kd, nlist) != 0) {
@ -91,41 +88,38 @@ _kvm_initvtop(kd)
}
if(!ISALIVE(kd)) {
if (kvm_read(kd, (nlist[0].n_value), &pa, sizeof(pa)) != sizeof(pa)) {
_kvm_err(kd, kd->program, "cannot read Lev1map");
if (kvm_read(kd, (nlist[0].n_value), &va, sizeof(va)) != sizeof(va)) {
_kvm_err(kd, kd->program, "cannot read kptdir");
return (-1);
}
} else
if (kvm_read(kd, (nlist[0].n_value), &pa, sizeof(pa)) != sizeof(pa)) {
_kvm_err(kd, kd->program, "cannot read Lev1map");
if (kvm_read(kd, (nlist[0].n_value), &va, sizeof(va)) != sizeof(va)) {
_kvm_err(kd, kd->program, "cannot read kptdir");
return (-1);
}
vm->lev1map_pa = pa;
vm->kptdir = IA64_RR_MASK(va);
return (0);
}
int
_kvm_kvatop(kd, va, pa)
kvm_t *kd;
u_long va;
u_long *pa;
_kvm_kvatop(kvm_t *kd, u_long va, u_long *pa)
{
u_int64_t lev1map_pa; /* PA of Lev1map */
u_int64_t page_size;
int rv, page_off;
pv_entry_t pte;
off_t pteoff;
struct vmstate *vm;
vm = kd->vmst ;
u_int64_t kptdir; /* PA of kptdir */
u_int64_t page_size;
int rv, page_off;
struct ia64_lpte pte;
off_t pteoff;
struct vmstate *vm;
vm = kd->vmst;
if (ISALIVE(kd)) {
_kvm_err(kd, 0, "vatop called in live kernel!");
return(0);
}
lev1map_pa = vm->lev1map_pa;
page_size = vm->page_size;
kptdir = vm->kptdir;
page_size = vm->page_size;
page_off = va & (page_size - 1);
if (va >= IA64_RR_BASE(6) && va <= IA64_RR_BASE(7) + ((1L<<61)-1)) {
@ -139,7 +133,42 @@ _kvm_kvatop(kd, va, pa)
/*
* Real kernel virtual address: do the translation.
*/
goto lose;
#define KPTE_DIR_INDEX(va, ps) \
(IA64_RR_MASK(va) / ((ps) * (ps) * sizeof(struct ia64_lpte)))
#define KPTE_PTE_INDEX(va, ps) \
(((va) / (ps)) % (ps / sizeof(struct ia64_lpte)))
int maxpt = page_size / sizeof(u_int64_t);
int ptno = KPTE_DIR_INDEX(va, page_size);
int pgno = KPTE_PTE_INDEX(va, page_size);
u_int64_t ptoff, pgoff;
if (ptno >= maxpt) {
_kvm_err(kd, 0, "invalid translation (va too large)");
goto lose;
}
ptoff = kptdir + ptno * sizeof(u_int64_t);
if (lseek(kd->pmfd, _kvm_pa2off(kd, ptoff), 0) == -1 ||
read(kd->pmfd, &pgoff, sizeof(pgoff)) != sizeof(pgoff)) {
_kvm_syserr(kd, 0, "could not read page table address");
goto lose;
}
pgoff = IA64_RR_MASK(pgoff);
if (!pgoff) {
_kvm_err(kd, 0, "invalid translation (no page table)");
goto lose;
}
if (lseek(kd->pmfd, _kvm_pa2off(kd, pgoff), 0) == -1 ||
read(kd->pmfd, &pte, sizeof(pte)) != sizeof(pte)) {
_kvm_syserr(kd, 0, "could not read PTE");
goto lose;
}
if (!pte.pte_p) {
_kvm_err(kd, 0, "invalid translation (invalid PTE)");
goto lose;
}
*pa = pte.pte_ppn << 12;
rv = page_size - page_off;
} else {
/*
* Bogus address (not in KV space): punt.