diff options
author | dfr <dfr@FreeBSD.org> | 2001-10-25 09:08:21 +0000 |
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committer | dfr <dfr@FreeBSD.org> | 2001-10-25 09:08:21 +0000 |
commit | 36e45996fff93651ecae0c5e27489e18068b2b1a (patch) | |
tree | c54303747dacbd03e32511baafebbd303d60b1ec /lib | |
parent | 591b34de05af99f8d4141d11c49b56edfbe4da9a (diff) | |
download | FreeBSD-src-36e45996fff93651ecae0c5e27489e18068b2b1a.zip FreeBSD-src-36e45996fff93651ecae0c5e27489e18068b2b1a.tar.gz |
Implement va->pa translation for kernel virtual addresses. This is
untested - it only seems to be used for crashdumps.
Diffstat (limited to 'lib')
-rw-r--r-- | lib/libkvm/kvm_ia64.c | 89 |
1 files changed, 59 insertions, 30 deletions
diff --git a/lib/libkvm/kvm_ia64.c b/lib/libkvm/kvm_ia64.c index 1a0907a..dbdc67b 100644 --- a/lib/libkvm/kvm_ia64.c +++ b/lib/libkvm/kvm_ia64.c @@ -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. |