1 /* $OpenBSD: kvm_alpha.c,v 1.10 2001/12/05 02:23:11 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 <uvm/uvm_extern.h> 44 #include <machine/vmparam.h> 45 #include <machine/pmap.h> 46 47 #include <limits.h> 48 #include <db.h> 49 50 #include "kvm_private.h" 51 52 struct vmstate { 53 vsize_t page_shift; 54 }; 55 56 void 57 _kvm_freevtop(kd) 58 kvm_t *kd; 59 { 60 61 /* Not actually used for anything right now, but safe. */ 62 if (kd->vmst != 0) 63 free(kd->vmst); 64 } 65 66 int 67 _kvm_initvtop(kd) 68 kvm_t *kd; 69 { 70 cpu_kcore_hdr_t *cpu_kh; 71 struct vmstate *vm; 72 73 vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm)); 74 if (vm == NULL) 75 return (-1); 76 77 cpu_kh = kd->cpu_data; 78 79 /* Compute page_shift. */ 80 for (vm->page_shift = 0; (1L << vm->page_shift) < cpu_kh->page_size; 81 vm->page_shift++) 82 /* nothing */ ; 83 if ((1L << vm->page_shift) != cpu_kh->page_size) { 84 free(vm); 85 return (-1); 86 } 87 88 kd->vmst = vm; 89 return (0); 90 } 91 92 int 93 _kvm_kvatop(kd, va, pa) 94 kvm_t *kd; 95 u_long va; 96 u_long *pa; 97 { 98 cpu_kcore_hdr_t *cpu_kh; 99 struct vmstate *vm; 100 int rv, page_off; 101 alpha_pt_entry_t pte; 102 off_t pteoff; 103 104 if (ISALIVE(kd)) { 105 _kvm_err(kd, 0, "vatop called in live kernel!"); 106 return(0); 107 } 108 109 cpu_kh = kd->cpu_data; 110 vm = kd->vmst; 111 page_off = va & (cpu_kh->page_size - 1); 112 113 #ifndef PAGE_SHIFT 114 #define PAGE_SHIFT vm->page_shift 115 #endif 116 117 if (va >= ALPHA_K0SEG_BASE && va <= ALPHA_K0SEG_END) { 118 /* 119 * Direct-mapped address: just convert it. 120 */ 121 122 *pa = ALPHA_K0SEG_TO_PHYS(va); 123 rv = cpu_kh->page_size - page_off; 124 } else if (va >= ALPHA_K1SEG_BASE && va <= ALPHA_K1SEG_END) { 125 /* 126 * Real kernel virtual address: do the translation. 127 */ 128 129 /* Find and read the L1 PTE. */ 130 pteoff = cpu_kh->lev1map_pa + 131 l1pte_index(va) * sizeof(alpha_pt_entry_t); 132 if (_kvm_pread(kd, kd->pmfd, (char *)&pte, sizeof(pte), (off_t)_kvm_pa2off(kd, pteoff)) != sizeof(pte)) { 133 _kvm_syserr(kd, 0, "could not read L1 PTE"); 134 goto lose; 135 } 136 137 /* Find and read the L2 PTE. */ 138 if ((pte & ALPHA_PTE_VALID) == 0) { 139 _kvm_err(kd, 0, "invalid translation (invalid L1 PTE)"); 140 goto lose; 141 } 142 pteoff = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size + 143 l2pte_index(va) * sizeof(alpha_pt_entry_t); 144 if (_kvm_pread(kd, kd->pmfd, (char *)&pte, sizeof(pte), (off_t)_kvm_pa2off(kd, pteoff)) != sizeof(pte)) { 145 _kvm_syserr(kd, 0, "could not read L2 PTE"); 146 goto lose; 147 } 148 149 /* Find and read the L3 PTE. */ 150 if ((pte & ALPHA_PTE_VALID) == 0) { 151 _kvm_err(kd, 0, "invalid translation (invalid L2 PTE)"); 152 goto lose; 153 } 154 pteoff = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size + 155 l3pte_index(va) * sizeof(alpha_pt_entry_t); 156 if (_kvm_pread(kd, kd->pmfd, (char *)&pte, sizeof(pte), (off_t)_kvm_pa2off(kd, pteoff)) != sizeof(pte)) { 157 _kvm_syserr(kd, 0, "could not read L3 PTE"); 158 goto lose; 159 } 160 161 /* Fill in the PA. */ 162 if ((pte & ALPHA_PTE_VALID) == 0) { 163 _kvm_err(kd, 0, "invalid translation (invalid L3 PTE)"); 164 goto lose; 165 } 166 *pa = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size + page_off; 167 rv = cpu_kh->page_size - page_off; 168 } else { 169 /* 170 * Bogus address (not in KV space): punt. 171 */ 172 173 _kvm_err(kd, 0, "invalid kernel virtual address"); 174 lose: 175 *pa = -1; 176 rv = 0; 177 } 178 179 return (rv); 180 } 181 182 /* 183 * Translate a physical address to a file-offset in the crash-dump. 184 */ 185 off_t 186 _kvm_pa2off(kd, pa) 187 kvm_t *kd; 188 u_long pa; 189 { 190 cpu_kcore_hdr_t *cpu_kh; 191 phys_ram_seg_t *ramsegs; 192 off_t off; 193 int i; 194 195 cpu_kh = kd->cpu_data; 196 ramsegs = (phys_ram_seg_t *)((char *)cpu_kh + ALIGN(sizeof *cpu_kh)); 197 198 off = 0; 199 for (i = 0; i < cpu_kh->nmemsegs; i++) { 200 if (pa >= ramsegs[i].start && 201 (pa - ramsegs[i].start) < ramsegs[i].size) { 202 off += (pa - ramsegs[i].start); 203 break; 204 } 205 off += ramsegs[i].size; 206 } 207 return (kd->dump_off + off); 208 } 209