1 /* $NetBSD: kvm_alpha.c,v 1.20 2001/08/05 17:51:40 matt 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 struct vmstate { 53 vsize_t page_shift; 54 }; 55 56 void 57 _kvm_freevtop(kd) 58 kvm_t *kd; 59 { 60 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 alpha_pt_entry_t pte; 100 u_long pteoff, page_off; 101 int rv; 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 #define PAGE_SHIFT vm->page_shift 113 114 if (va >= ALPHA_K0SEG_BASE && va <= ALPHA_K0SEG_END) { 115 /* 116 * Direct-mapped address: just convert it. 117 */ 118 119 *pa = ALPHA_K0SEG_TO_PHYS(va); 120 rv = cpu_kh->page_size - page_off; 121 } else if (va >= ALPHA_K1SEG_BASE && va <= ALPHA_K1SEG_END) { 122 /* 123 * Real kernel virtual address: do the translation. 124 */ 125 126 /* Find and read the L1 PTE. */ 127 pteoff = cpu_kh->lev1map_pa + 128 l1pte_index(va) * sizeof(alpha_pt_entry_t); 129 if (pread(kd->pmfd, &pte, sizeof(pte), 130 _kvm_pa2off(kd, pteoff)) != sizeof(pte)) { 131 _kvm_syserr(kd, 0, "could not read L1 PTE"); 132 goto lose; 133 } 134 135 /* Find and read the L2 PTE. */ 136 if ((pte & ALPHA_PTE_VALID) == 0) { 137 _kvm_err(kd, 0, "invalid translation (invalid L1 PTE)"); 138 goto lose; 139 } 140 pteoff = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size + 141 l2pte_index(va) * sizeof(alpha_pt_entry_t); 142 if (pread(kd->pmfd, &pte, sizeof(pte), 143 _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 (pread(kd->pmfd, &pte, sizeof(pte), 156 _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 #undef PAGE_SHIFT 180 181 return (rv); 182 } 183 184 /* 185 * Translate a physical address to a file-offset in the crash-dump. 186 */ 187 off_t 188 _kvm_pa2off(kd, pa) 189 kvm_t *kd; 190 u_long pa; 191 { 192 cpu_kcore_hdr_t *cpu_kh; 193 phys_ram_seg_t *ramsegs; 194 off_t off; 195 int i; 196 197 cpu_kh = kd->cpu_data; 198 ramsegs = (phys_ram_seg_t *)((char *)cpu_kh + ALIGN(sizeof *cpu_kh)); 199 200 off = 0; 201 for (i = 0; i < cpu_kh->nmemsegs; i++) { 202 if (pa >= ramsegs[i].start && 203 (pa - ramsegs[i].start) < ramsegs[i].size) { 204 off += (pa - ramsegs[i].start); 205 break; 206 } 207 off += ramsegs[i].size; 208 } 209 210 return (kd->dump_off + off); 211 } 212 213 /* 214 * Machine-dependent initialization for ALL open kvm descriptors, 215 * not just those for a kernel crash dump. Some architectures 216 * have to deal with these NOT being constants! (i.e. m68k) 217 */ 218 int 219 _kvm_mdopen(kd) 220 kvm_t *kd; 221 { 222 223 kd->usrstack = USRSTACK; 224 kd->min_uva = VM_MIN_ADDRESS; 225 kd->max_uva = VM_MAXUSER_ADDRESS; 226 227 return (0); 228 } 229