lib/libkvm/kvm_alpha.c

   1 /* $NetBSD: kvm_alpha.c,v 1.27 2014/02/19 20:21:22 dsl 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/proc.h>
  34 #include <sys/stat.h>
  35 #include <sys/kcore.h>
  36 #include <sys/types.h>
  37 #include <unistd.h>
  38 #include <nlist.h>
  39 #include <kvm.h>
  40
  41 #include <uvm/uvm_extern.h>
  42
  43 #include <machine/kcore.h>
  44 #include <machine/pmap.h>
  45 #include <machine/vmparam.h>
  46
  47 #include <limits.h>
  48 #include <db.h>
  49 #include <stdlib.h>
  50
  51 #include "kvm_private.h"
  52
  53 __RCSID("$NetBSD: kvm_alpha.c,v 1.27 2014/02/19 20:21:22 dsl Exp $");
  54
  55 /*ARGSUSED*/
  56 void
  57 _kvm_freevtop(kvm_t *kd)
  58 {
  59         return;
  60 }
  61
  62 /*ARGSUSED*/
  63 int
  64 _kvm_initvtop(kvm_t *kd)
  65 {
  66         return (0);
  67 }
  68
  69 int
  70 _kvm_kvatop(kvm_t *kd, vaddr_t va, paddr_t *pa)
  71 {
  72         cpu_kcore_hdr_t *cpu_kh;
  73         alpha_pt_entry_t pte;
  74         u_long pteoff, page_off;
  75         int rv;
  76
  77         if (ISALIVE(kd)) {
  78                 _kvm_err(kd, 0, "vatop called in live kernel!");
  79                 return(0);
  80         }
  81
  82         cpu_kh = kd->cpu_data;
  83         page_off = va & (cpu_kh->page_size - 1);
  84
  85         if (va >= ALPHA_K0SEG_BASE && va <= ALPHA_K0SEG_END) {
  86                 /*
  87                  * Direct-mapped address: just convert it.
  88                  */
  89
  90                 *pa = ALPHA_K0SEG_TO_PHYS(va);
  91                 rv = cpu_kh->page_size - page_off;
  92         } else if (va >= ALPHA_K1SEG_BASE && va <= ALPHA_K1SEG_END) {
  93                 /*
  94                  * Real kernel virtual address: do the translation.
  95                  */
  96
  97                 /* Find and read the L1 PTE. */
  98                 pteoff = cpu_kh->lev1map_pa +
  99                     l1pte_index(va) * sizeof(alpha_pt_entry_t);
 100                 if (_kvm_pread(kd, kd->pmfd, &pte, sizeof(pte),
 101                     _kvm_pa2off(kd, pteoff)) != sizeof(pte)) {
 102                         _kvm_syserr(kd, 0, "could not read L1 PTE");
 103                         goto lose;
 104                 }
 105
 106                 /* Find and read the L2 PTE. */
 107                 if ((pte & ALPHA_PTE_VALID) == 0) {
 108                         _kvm_err(kd, 0, "invalid translation (invalid L1 PTE)");
 109                         goto lose;
 110                 }
 111                 pteoff = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size +
 112                     l2pte_index(va) * sizeof(alpha_pt_entry_t);
 113                 if (_kvm_pread(kd, kd->pmfd, &pte, sizeof(pte),
 114                     _kvm_pa2off(kd, pteoff)) != sizeof(pte)) {
 115                         _kvm_syserr(kd, 0, "could not read L2 PTE");
 116                         goto lose;
 117                 }
 118
 119                 /* Find and read the L3 PTE. */
 120                 if ((pte & ALPHA_PTE_VALID) == 0) {
 121                         _kvm_err(kd, 0, "invalid translation (invalid L2 PTE)");
 122                         goto lose;
 123                 }
 124                 pteoff = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size +
 125                     l3pte_index(va) * sizeof(alpha_pt_entry_t);
 126                 if (_kvm_pread(kd, kd->pmfd, &pte, sizeof(pte),
 127                     _kvm_pa2off(kd, pteoff)) != sizeof(pte)) {
 128                         _kvm_syserr(kd, 0, "could not read L3 PTE");
 129                         goto lose;
 130                 }
 131
 132                 /* Fill in the PA. */
 133                 if ((pte & ALPHA_PTE_VALID) == 0) {
 134                         _kvm_err(kd, 0, "invalid translation (invalid L3 PTE)");
 135                         goto lose;
 136                 }
 137                 *pa = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size + page_off;
 138                 rv = cpu_kh->page_size - page_off;
 139         } else {
 140                 /*
 141                  * Bogus address (not in KV space): punt.
 142                  */
 143
 144                 _kvm_err(kd, 0, "invalid kernel virtual address");
 145 lose:
 146                 *pa = -1;
 147                 rv = 0;
 148         }
 149
 150         return (rv);
 151 }
 152
 153 /*
 154  * Translate a physical address to a file-offset in the crash dump.
 155  */
 156 off_t
 157 _kvm_pa2off(kvm_t *kd, paddr_t pa)
 158 {
 159         cpu_kcore_hdr_t *cpu_kh;
 160         phys_ram_seg_t *ramsegs;
 161         off_t off;
 162         int i;
 163
 164         cpu_kh = kd->cpu_data;
 165         ramsegs = (phys_ram_seg_t *)((char *)cpu_kh + ALIGN(sizeof *cpu_kh));
 166
 167         off = 0;
 168         for (i = 0; i < cpu_kh->nmemsegs; i++) {
 169                 if (pa >= ramsegs[i].start &&
 170                     (pa - ramsegs[i].start) < ramsegs[i].size) {
 171                         off += (pa - ramsegs[i].start);
 172                         break;
 173                 }
 174                 off += ramsegs[i].size;
 175         }
 176
 177         return (kd->dump_off + off);
 178 }
 179
 180 /*
 181  * Machine-dependent initialization for ALL open kvm descriptors,
 182  * not just those for a kernel crash dump.  Some architectures
 183  * have to deal with these NOT being constants!  (i.e. m68k)
 184  */
 185 int
 186 _kvm_mdopen(kvm_t *kd)
 187 {
 188
 189         kd->usrstack = USRSTACK;
 190         kd->min_uva = VM_MIN_ADDRESS;
 191         kd->max_uva = VM_MAXUSER_ADDRESS;
 192
 193         return (0);
 194 }