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-rw-r--r--lib/libkvm/kvm_alpha.c212
1 files changed, 212 insertions, 0 deletions
diff --git a/lib/libkvm/kvm_alpha.c b/lib/libkvm/kvm_alpha.c
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+++ b/lib/libkvm/kvm_alpha.c
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+/* $FreeBSD$ */
+/* $NetBSD: kvm_alpha.c,v 1.7.2.1 1997/11/02 20:34:26 mellon Exp $ */
+
+/*
+ * Copyright (c) 1994, 1995 Carnegie-Mellon University.
+ * All rights reserved.
+ *
+ * Author: Chris G. Demetriou
+ *
+ * Permission to use, copy, modify and distribute this software and
+ * its documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ *
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
+ * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * Carnegie Mellon requests users of this software to return to
+ *
+ * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
+ * School of Computer Science
+ * Carnegie Mellon University
+ * Pittsburgh PA 15213-3890
+ *
+ * any improvements or extensions that they make and grant Carnegie the
+ * rights to redistribute these changes.
+ */
+
+#include <sys/param.h>
+#include <sys/user.h>
+#include <sys/proc.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/uio.h>
+#include <unistd.h>
+#include <nlist.h>
+#include <kvm.h>
+
+#include <vm/vm.h>
+#include <vm/vm_param.h>
+
+#include <limits.h>
+#include <db.h>
+#include <stdlib.h>
+#include <machine/pmap.h>
+#include "kvm_private.h"
+
+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 */
+};
+
+void
+_kvm_freevtop(kd)
+ kvm_t *kd;
+{
+
+ /* Not actually used for anything right now, but safe. */
+ if (kd->vmst != 0)
+ free(kd->vmst);
+}
+
+int
+_kvm_initvtop(kd)
+ kvm_t *kd;
+{
+ struct vmstate *vm;
+ struct nlist nlist[2];
+ u_long pa;
+
+ vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm));
+ if (vm == 0) {
+ _kvm_err(kd, kd->program, "cannot allocate vm");
+ return (-1);
+ }
+ kd->vmst = vm;
+ vm->page_size = ALPHA_PGBYTES;
+
+ nlist[0].n_name = "_Lev1map";
+ nlist[1].n_name = 0;
+
+ if (kvm_nlist(kd, nlist) != 0) {
+ _kvm_err(kd, kd->program, "bad namelist");
+ return (-1);
+ }
+
+ if(!ISALIVE(kd)) {
+ if (kvm_read(kd, (nlist[0].n_value), &pa, sizeof(pa)) != sizeof(pa)) {
+ _kvm_err(kd, kd->program, "cannot read Lev1map");
+ return (-1);
+ }
+ } else
+ if (kvm_read(kd, (nlist[0].n_value), &pa, sizeof(pa)) != sizeof(pa)) {
+ _kvm_err(kd, kd->program, "cannot read Lev1map");
+ return (-1);
+ }
+ vm->lev1map_pa = pa;
+ return (0);
+
+}
+
+int
+_kvm_kvatop(kd, va, pa)
+ 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;
+ alpha_pt_entry_t 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;
+
+ page_off = va & (page_size - 1);
+ if (va >= ALPHA_K0SEG_BASE && va <= ALPHA_K0SEG_END) {
+ /*
+ * Direct-mapped address: just convert it.
+ */
+
+ *pa = ALPHA_K0SEG_TO_PHYS(va);
+ rv = page_size - page_off;
+ } else if (va >= ALPHA_K1SEG_BASE && va <= ALPHA_K1SEG_END) {
+ /*
+ * Real kernel virtual address: do the translation.
+ */
+#define PTMASK ((1 << ALPHA_PTSHIFT) - 1)
+#define pmap_lev1_index(va) (((va) >> ALPHA_L1SHIFT) & PTMASK)
+#define pmap_lev2_index(va) (((va) >> ALPHA_L2SHIFT) & PTMASK)
+#define pmap_lev3_index(va) (((va) >> ALPHA_L3SHIFT) & PTMASK)
+
+ /* Find and read the L1 PTE. */
+ pteoff = lev1map_pa +
+ pmap_lev1_index(va) * sizeof(alpha_pt_entry_t);
+ if (lseek(kd->pmfd, _kvm_pa2off(kd, pteoff), 0) == -1 ||
+ read(kd->pmfd, (char *)&pte, sizeof(pte)) != sizeof(pte)) {
+ _kvm_syserr(kd, 0, "could not read L1 PTE");
+ goto lose;
+ }
+
+ /* Find and read the L2 PTE. */
+ if ((pte & ALPHA_PTE_VALID) == 0) {
+ _kvm_err(kd, 0, "invalid translation (invalid L1 PTE)");
+ goto lose;
+ }
+ pteoff = ALPHA_PTE_TO_PFN(pte) * page_size +
+ pmap_lev2_index(va) * sizeof(alpha_pt_entry_t);
+ if (lseek(kd->pmfd, _kvm_pa2off(kd, pteoff), 0) == -1 ||
+ read(kd->pmfd, (char *)&pte, sizeof(pte)) != sizeof(pte)) {
+ _kvm_syserr(kd, 0, "could not read L2 PTE");
+ goto lose;
+ }
+
+ /* Find and read the L3 PTE. */
+ if ((pte & ALPHA_PTE_VALID) == 0) {
+ _kvm_err(kd, 0, "invalid translation (invalid L2 PTE)");
+ goto lose;
+ }
+ pteoff = ALPHA_PTE_TO_PFN(pte) * page_size +
+ pmap_lev3_index(va) * sizeof(alpha_pt_entry_t);
+ if (lseek(kd->pmfd, _kvm_pa2off(kd, pteoff), 0) == -1 ||
+ read(kd->pmfd, (char *)&pte, sizeof(pte)) != sizeof(pte)) {
+ _kvm_syserr(kd, 0, "could not read L3 PTE");
+ goto lose;
+ }
+
+ /* Fill in the PA. */
+ if ((pte & ALPHA_PTE_VALID) == 0) {
+ _kvm_err(kd, 0, "invalid translation (invalid L3 PTE)");
+ goto lose;
+ }
+ *pa = ALPHA_PTE_TO_PFN(pte) * page_size + page_off;
+ rv = page_size - page_off;
+ } else {
+ /*
+ * Bogus address (not in KV space): punt.
+ */
+
+ _kvm_err(kd, 0, "invalid kernel virtual address");
+lose:
+ *pa = -1;
+ rv = 0;
+ }
+
+ return (rv);
+}
+
+/*
+ * Translate a physical address to a file-offset in the crash-dump.
+ */
+off_t
+_kvm_pa2off(kd, pa)
+ kvm_t *kd;
+ u_long pa;
+{
+ return ALPHA_K0SEG_TO_PHYS(pa);
+}
+
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