1 /* $OpenBSD: kvm_alpha.c,v 1.7 2001/05/18 09:08:37 art Exp $ */ 2 /* $NetBSD: kvm_alpha.c,v 1.5 1996/10/01 21:12:05 cgd Exp $ */ 3 4 /* 5 * Copyright (c) 1994, 1995 Carnegie-Mellon University. 6 * All rights reserved. 7 * 8 * Author: Chris G. Demetriou 9 * 10 * Permission to use, copy, modify and distribute this software and 11 * its documentation is hereby granted, provided that both the copyright 12 * notice and this permission notice appear in all copies of the 13 * software, derivative works or modified versions, and any portions 14 * thereof, and that both notices appear in supporting documentation. 15 * 16 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 17 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 18 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 19 * 20 * Carnegie Mellon requests users of this software to return to 21 * 22 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 23 * School of Computer Science 24 * Carnegie Mellon University 25 * Pittsburgh PA 15213-3890 26 * 27 * any improvements or extensions that they make and grant Carnegie the 28 * rights to redistribute these changes. 29 */ 30 31 #define __KVM_ALPHA_PRIVATE /* see <machine/pte.h> */ 32 33 #include <sys/param.h> 34 #include <sys/user.h> 35 #include <sys/proc.h> 36 #include <sys/stat.h> 37 #include <sys/kcore.h> 38 #include <machine/kcore.h> 39 #include <unistd.h> 40 #include <nlist.h> 41 #include <kvm.h> 42 43 #include <vm/vm.h> 44 #include <vm/vm_param.h> 45 46 #include <limits.h> 47 #include <db.h> 48 49 #include "kvm_private.h" 50 51 struct vmstate { 52 vsize_t page_shift; 53 }; 54 55 void 56 _kvm_freevtop(kd) 57 kvm_t *kd; 58 { 59 60 /* Not actually used for anything right now, but safe. */ 61 if (kd->vmst != 0) 62 free(kd->vmst); 63 } 64 65 int 66 _kvm_initvtop(kd) 67 kvm_t *kd; 68 { 69 cpu_kcore_hdr_t *cpu_kh; 70 struct vmstate *vm; 71 72 vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm)); 73 if (vm == NULL) 74 return (-1); 75 76 cpu_kh = kd->cpu_data; 77 78 /* Compute page_shift. */ 79 for (vm->page_shift = 0; (1L << vm->page_shift) < cpu_kh->page_size; 80 vm->page_shift++) 81 /* nothing */ ; 82 if ((1L << vm->page_shift) != cpu_kh->page_size) { 83 free(vm); 84 return (-1); 85 } 86 87 kd->vmst = vm; 88 return (0); 89 } 90 91 int 92 _kvm_kvatop(kd, va, pa) 93 kvm_t *kd; 94 u_long va; 95 u_long *pa; 96 { 97 cpu_kcore_hdr_t *cpu_kh; 98 struct vmstate *vm; 99 int rv, page_off; 100 alpha_pt_entry_t pte; 101 off_t pteoff; 102 103 if (ISALIVE(kd)) { 104 _kvm_err(kd, 0, "vatop called in live kernel!"); 105 return(0); 106 } 107 108 cpu_kh = kd->cpu_data; 109 vm = kd->vmst; 110 page_off = va & (cpu_kh->page_size - 1); 111 112 #ifndef PAGE_SHIFT 113 #define PAGE_SHIFT vm->page_shift 114 #endif 115 116 if (va >= ALPHA_K0SEG_BASE && va <= ALPHA_K0SEG_END) { 117 /* 118 * Direct-mapped address: just convert it. 119 */ 120 121 *pa = ALPHA_K0SEG_TO_PHYS(va); 122 rv = cpu_kh->page_size - page_off; 123 } else if (va >= ALPHA_K1SEG_BASE && va <= ALPHA_K1SEG_END) { 124 /* 125 * Real kernel virtual address: do the translation. 126 */ 127 128 /* Find and read the L1 PTE. */ 129 pteoff = cpu_kh->lev1map_pa + 130 l1pte_index(va) * sizeof(alpha_pt_entry_t); 131 if (_kvm_pread(kd, kd->pmfd, (char *)&pte, sizeof(pte), (off_t)_kvm_pa2off(kd, pteoff)) != sizeof(pte)) { 132 _kvm_syserr(kd, 0, "could not read L1 PTE"); 133 goto lose; 134 } 135 136 /* Find and read the L2 PTE. */ 137 if ((pte & ALPHA_PTE_VALID) == 0) { 138 _kvm_err(kd, 0, "invalid translation (invalid L1 PTE)"); 139 goto lose; 140 } 141 pteoff = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size + 142 l2pte_index(va) * sizeof(alpha_pt_entry_t); 143 if (_kvm_pread(kd, kd->pmfd, (char *)&pte, sizeof(pte), (off_t)_kvm_pa2off(kd, pteoff)) != sizeof(pte)) { 144 _kvm_syserr(kd, 0, "could not read L2 PTE"); 145 goto lose; 146 } 147 148 /* Find and read the L3 PTE. */ 149 if ((pte & ALPHA_PTE_VALID) == 0) { 150 _kvm_err(kd, 0, "invalid translation (invalid L2 PTE)"); 151 goto lose; 152 } 153 pteoff = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size + 154 l3pte_index(va) * sizeof(alpha_pt_entry_t); 155 if (_kvm_pread(kd, kd->pmfd, (char *)&pte, sizeof(pte), (off_t)_kvm_pa2off(kd, pteoff)) != sizeof(pte)) { 156 _kvm_syserr(kd, 0, "could not read L3 PTE"); 157 goto lose; 158 } 159 160 /* Fill in the PA. */ 161 if ((pte & ALPHA_PTE_VALID) == 0) { 162 _kvm_err(kd, 0, "invalid translation (invalid L3 PTE)"); 163 goto lose; 164 } 165 *pa = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size + page_off; 166 rv = cpu_kh->page_size - page_off; 167 } else { 168 /* 169 * Bogus address (not in KV space): punt. 170 */ 171 172 _kvm_err(kd, 0, "invalid kernel virtual address"); 173 lose: 174 *pa = -1; 175 rv = 0; 176 } 177 178 return (rv); 179 } 180 181 /* 182 * Translate a physical address to a file-offset in the crash-dump. 183 */ 184 off_t 185 _kvm_pa2off(kd, pa) 186 kvm_t *kd; 187 u_long pa; 188 { 189 cpu_kcore_hdr_t *cpu_kh; 190 phys_ram_seg_t *ramsegs; 191 off_t off; 192 int i; 193 194 cpu_kh = kd->cpu_data; 195 ramsegs = (phys_ram_seg_t *)((char *)cpu_kh + ALIGN(sizeof *cpu_kh)); 196 197 off = 0; 198 for (i = 0; i < cpu_kh->nmemsegs; i++) { 199 if (pa >= ramsegs[i].start && 200 (pa - ramsegs[i].start) < ramsegs[i].size) { 201 off += (pa - ramsegs[i].start); 202 break; 203 } 204 off += ramsegs[i].size; 205 } 206 return (kd->dump_off + off); 207 } 208