lib/libkvm/kvm_alpha.c

   1 /* $NetBSD: kvm_alpha.c,v 1.22 2003/05/16 10:24:55 wiz Exp $ */
   2
   3 /*
   4  * Copyright (c) 1994, 1995 Carnegie-Mellon University.
   5  * All rights reserved.
   6  *
   7  * Author: Chris G. Demetriou
   8  *
   9  * Permission to use, copy, modify and distribute this software and
  10  * its documentation is hereby granted, provided that both the copyright
  11  * notice and this permission notice appear in all copies of the
  12  * software, derivative works or modified versions, and any portions
  13  * thereof, and that both notices appear in supporting documentation.
  14  *
  15  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  16  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
  17  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  18  *
  19  * Carnegie Mellon requests users of this software to return to
  20  *
  21  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  22  *  School of Computer Science
  23  *  Carnegie Mellon University
  24  *  Pittsburgh PA 15213-3890
  25  *
  26  * any improvements or extensions that they make and grant Carnegie the
  27  * rights to redistribute these changes.
  28  */
  29
  30 #define __KVM_ALPHA_PRIVATE             /* see <machine/pte.h> */
  31
  32 #include <sys/param.h>
  33 #include <sys/user.h>
  34 #include <sys/proc.h>
  35 #include <sys/stat.h>
  36 #include <sys/kcore.h>
  37 #include <machine/kcore.h>
  38 #include <unistd.h>
  39 #include <nlist.h>
  40 #include <kvm.h>
  41
  42 #include <uvm/uvm_extern.h>
  43 #include <machine/pmap.h>
  44 #include <machine/vmparam.h>
  45
  46 #include <limits.h>
  47 #include <db.h>
  48 #include <stdlib.h>
  49
  50 #include "kvm_private.h"
  51
  52 /*ARGSUSED*/
  53 void
  54 _kvm_freevtop(kd)
  55         kvm_t *kd;
  56 {
  57         return;
  58 }
  59
  60 /*ARGSUSED*/
  61 int
  62 _kvm_initvtop(kd)
  63         kvm_t *kd;
  64 {
  65         return (0);
  66 }
  67
  68 int
  69 _kvm_kvatop(kd, va, pa)
  70         kvm_t *kd;
  71         u_long va;
  72         u_long *pa;
  73 {
  74         cpu_kcore_hdr_t *cpu_kh;
  75         alpha_pt_entry_t pte;
  76         u_long pteoff, page_off;
  77         int rv;
  78
  79         if (ISALIVE(kd)) {
  80                 _kvm_err(kd, 0, "vatop called in live kernel!");
  81                 return(0);
  82         }
  83
  84         cpu_kh = kd->cpu_data;
  85         page_off = va & (cpu_kh->page_size - 1);
  86
  87         if (va >= ALPHA_K0SEG_BASE && va <= ALPHA_K0SEG_END) {
  88                 /*
  89                  * Direct-mapped address: just convert it.
  90                  */
  91
  92                 *pa = ALPHA_K0SEG_TO_PHYS(va);
  93                 rv = cpu_kh->page_size - page_off;
  94         } else if (va >= ALPHA_K1SEG_BASE && va <= ALPHA_K1SEG_END) {
  95                 /*
  96                  * Real kernel virtual address: do the translation.
  97                  */
  98
  99                 /* Find and read the L1 PTE. */
 100                 pteoff = cpu_kh->lev1map_pa +
 101                     l1pte_index(va) * sizeof(alpha_pt_entry_t);
 102                 if (_kvm_pread(kd, kd->pmfd, &pte, sizeof(pte),
 103                     _kvm_pa2off(kd, pteoff)) != sizeof(pte)) {
 104                         _kvm_syserr(kd, 0, "could not read L1 PTE");
 105                         goto lose;
 106                 }
 107
 108                 /* Find and read the L2 PTE. */
 109                 if ((pte & ALPHA_PTE_VALID) == 0) {
 110                         _kvm_err(kd, 0, "invalid translation (invalid L1 PTE)");
 111                         goto lose;
 112                 }
 113                 pteoff = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size +
 114                     l2pte_index(va) * sizeof(alpha_pt_entry_t);
 115                 if (_kvm_pread(kd, kd->pmfd, &pte, sizeof(pte),
 116                     _kvm_pa2off(kd, pteoff)) != sizeof(pte)) {
 117                         _kvm_syserr(kd, 0, "could not read L2 PTE");
 118                         goto lose;
 119                 }
 120
 121                 /* Find and read the L3 PTE. */
 122                 if ((pte & ALPHA_PTE_VALID) == 0) {
 123                         _kvm_err(kd, 0, "invalid translation (invalid L2 PTE)");
 124                         goto lose;
 125                 }
 126                 pteoff = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size +
 127                     l3pte_index(va) * sizeof(alpha_pt_entry_t);
 128                 if (_kvm_pread(kd, kd->pmfd, &pte, sizeof(pte),
 129                     _kvm_pa2off(kd, pteoff)) != sizeof(pte)) {
 130                         _kvm_syserr(kd, 0, "could not read L3 PTE");
 131                         goto lose;
 132                 }
 133
 134                 /* Fill in the PA. */
 135                 if ((pte & ALPHA_PTE_VALID) == 0) {
 136                         _kvm_err(kd, 0, "invalid translation (invalid L3 PTE)");
 137                         goto lose;
 138                 }
 139                 *pa = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size + page_off;
 140                 rv = cpu_kh->page_size - page_off;
 141         } else {
 142                 /*
 143                  * Bogus address (not in KV space): punt.
 144                  */
 145
 146                 _kvm_err(kd, 0, "invalid kernel virtual address");
 147 lose:
 148                 *pa = -1;
 149                 rv = 0;
 150         }
 151
 152         return (rv);
 153 }
 154
 155 /*
 156  * Translate a physical address to a file-offset in the crash dump.
 157  */
 158 off_t
 159 _kvm_pa2off(kd, pa)
 160         kvm_t *kd;
 161         u_long pa;
 162 {
 163         cpu_kcore_hdr_t *cpu_kh;
 164         phys_ram_seg_t *ramsegs;
 165         off_t off;
 166         int i;
 167
 168         cpu_kh = kd->cpu_data;
 169         ramsegs = (phys_ram_seg_t *)((char *)cpu_kh + ALIGN(sizeof *cpu_kh));
 170
 171         off = 0;
 172         for (i = 0; i < cpu_kh->nmemsegs; i++) {
 173                 if (pa >= ramsegs[i].start &&
 174                     (pa - ramsegs[i].start) < ramsegs[i].size) {
 175                         off += (pa - ramsegs[i].start);
 176                         break;
 177                 }
 178                 off += ramsegs[i].size;
 179         }
 180
 181         return (kd->dump_off + off);
 182 }
 183
 184 /*
 185  * Machine-dependent initialization for ALL open kvm descriptors,
 186  * not just those for a kernel crash dump.  Some architectures
 187  * have to deal with these NOT being constants!  (i.e. m68k)
 188  */
 189 int
 190 _kvm_mdopen(kd)
 191         kvm_t   *kd;
 192 {
 193
 194         kd->usrstack = USRSTACK;
 195         kd->min_uva = VM_MIN_ADDRESS;
 196         kd->max_uva = VM_MAXUSER_ADDRESS;
 197
 198         return (0);
 199 }