1 /* $NetBSD: kvm_alpha.c,v 1.23 2008/01/15 13:57:41 ad 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 } 200