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214 lines
5.3 KiB
C
214 lines
5.3 KiB
C
/* $FreeBSD$ */
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/* $NetBSD: kvm_alpha.c,v 1.7.2.1 1997/11/02 20:34:26 mellon Exp $ */
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/*
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* Copyright (c) 1994, 1995 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Chris G. Demetriou
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/user.h>
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#include <sys/proc.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <unistd.h>
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#include <nlist.h>
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#include <kvm.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <limits.h>
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#include <stdlib.h>
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#include <machine/pmap.h>
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#include "kvm_private.h"
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static off_t _kvm_pa2off(kvm_t *kd, u_long pa);
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struct vmstate {
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u_int64_t lev1map_pa; /* PA of Lev1map */
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u_int64_t page_size; /* Page size */
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u_int64_t nmemsegs; /* Number of RAM segm */
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};
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void
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_kvm_freevtop(kd)
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kvm_t *kd;
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{
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/* Not actually used for anything right now, but safe. */
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if (kd->vmst != 0)
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free(kd->vmst);
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}
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int
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_kvm_initvtop(kd)
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kvm_t *kd;
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{
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struct vmstate *vm;
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struct nlist nlist[2];
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u_long pa;
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vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm));
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if (vm == 0) {
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_kvm_err(kd, kd->program, "cannot allocate vm");
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return (-1);
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}
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kd->vmst = vm;
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vm->page_size = ALPHA_PGBYTES;
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nlist[0].n_name = "_Lev1map";
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nlist[1].n_name = 0;
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if (kvm_nlist(kd, nlist) != 0) {
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_kvm_err(kd, kd->program, "bad namelist");
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return (-1);
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}
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if(!ISALIVE(kd)) {
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if (kvm_read(kd, (nlist[0].n_value), &pa, sizeof(pa)) != sizeof(pa)) {
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_kvm_err(kd, kd->program, "cannot read Lev1map");
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return (-1);
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}
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} else
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if (kvm_read(kd, (nlist[0].n_value), &pa, sizeof(pa)) != sizeof(pa)) {
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_kvm_err(kd, kd->program, "cannot read Lev1map");
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return (-1);
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}
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vm->lev1map_pa = pa;
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return (0);
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}
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int
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_kvm_kvatop(kd, va, pa)
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kvm_t *kd;
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u_long va;
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u_long *pa;
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{
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u_int64_t lev1map_pa; /* PA of Lev1map */
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u_int64_t page_size;
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int rv, page_off;
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alpha_pt_entry_t pte;
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off_t pteoff;
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struct vmstate *vm;
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vm = kd->vmst ;
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if (ISALIVE(kd)) {
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_kvm_err(kd, 0, "vatop called in live kernel!");
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return(0);
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}
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lev1map_pa = vm->lev1map_pa;
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page_size = vm->page_size;
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page_off = va & (page_size - 1);
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if (va >= ALPHA_K0SEG_BASE && va <= ALPHA_K0SEG_END) {
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/*
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* Direct-mapped address: just convert it.
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*/
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*pa = ALPHA_K0SEG_TO_PHYS(va);
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rv = page_size - page_off;
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} else if (va >= ALPHA_K1SEG_BASE && va <= ALPHA_K1SEG_END) {
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/*
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* Real kernel virtual address: do the translation.
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*/
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#define PTMASK ((1 << ALPHA_PTSHIFT) - 1)
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#define pmap_lev1_index(va) (((va) >> ALPHA_L1SHIFT) & PTMASK)
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#define pmap_lev2_index(va) (((va) >> ALPHA_L2SHIFT) & PTMASK)
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#define pmap_lev3_index(va) (((va) >> ALPHA_L3SHIFT) & PTMASK)
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/* Find and read the L1 PTE. */
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pteoff = lev1map_pa +
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pmap_lev1_index(va) * sizeof(alpha_pt_entry_t);
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if (lseek(kd->pmfd, _kvm_pa2off(kd, pteoff), 0) == -1 ||
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read(kd->pmfd, (char *)&pte, sizeof(pte)) != sizeof(pte)) {
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_kvm_syserr(kd, 0, "could not read L1 PTE");
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goto lose;
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}
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/* Find and read the L2 PTE. */
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if ((pte & ALPHA_PTE_VALID) == 0) {
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_kvm_err(kd, 0, "invalid translation (invalid L1 PTE)");
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goto lose;
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}
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pteoff = ALPHA_PTE_TO_PFN(pte) * page_size +
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pmap_lev2_index(va) * sizeof(alpha_pt_entry_t);
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if (lseek(kd->pmfd, _kvm_pa2off(kd, pteoff), 0) == -1 ||
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read(kd->pmfd, (char *)&pte, sizeof(pte)) != sizeof(pte)) {
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_kvm_syserr(kd, 0, "could not read L2 PTE");
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goto lose;
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}
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/* Find and read the L3 PTE. */
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if ((pte & ALPHA_PTE_VALID) == 0) {
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_kvm_err(kd, 0, "invalid translation (invalid L2 PTE)");
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goto lose;
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}
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pteoff = ALPHA_PTE_TO_PFN(pte) * page_size +
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pmap_lev3_index(va) * sizeof(alpha_pt_entry_t);
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if (lseek(kd->pmfd, _kvm_pa2off(kd, pteoff), 0) == -1 ||
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read(kd->pmfd, (char *)&pte, sizeof(pte)) != sizeof(pte)) {
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_kvm_syserr(kd, 0, "could not read L3 PTE");
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goto lose;
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}
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/* Fill in the PA. */
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if ((pte & ALPHA_PTE_VALID) == 0) {
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_kvm_err(kd, 0, "invalid translation (invalid L3 PTE)");
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goto lose;
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}
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*pa = ALPHA_PTE_TO_PFN(pte) * page_size + page_off;
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rv = page_size - page_off;
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} else {
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/*
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* Bogus address (not in KV space): punt.
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*/
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_kvm_err(kd, 0, "invalid kernel virtual address");
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lose:
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*pa = -1;
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rv = 0;
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}
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return (rv);
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}
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/*
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* Translate a physical address to a file-offset in the crash-dump.
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*/
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off_t
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_kvm_pa2off(kd, pa)
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kvm_t *kd;
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u_long pa;
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{
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return ALPHA_K0SEG_TO_PHYS(pa);
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}
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