1 /* $NetBSD: kvm_alpha.c,v 1.7 1997/10/10 08:45:32 mrg 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 #include <sys/param.h> 31 #include <sys/user.h> 32 #include <sys/proc.h> 33 #include <sys/stat.h> 34 #include <sys/kcore.h> 35 #include <machine/kcore.h> 36 #include <unistd.h> 37 #include <nlist.h> 38 #include <kvm.h> 39 40 #include <vm/vm.h> 41 #include <vm/vm_param.h> 42 43 #include <limits.h> 44 #include <db.h> 45 #include <stdlib.h> 46 47 #include "kvm_private.h" 48 49 void 50 _kvm_freevtop(kd) 51 kvm_t *kd; 52 { 53 54 /* Not actually used for anything right now, but safe. */ 55 if (kd->vmst != 0) 56 free(kd->vmst); 57 } 58 59 int 60 _kvm_initvtop(kd) 61 kvm_t *kd; 62 { 63 64 return (0); 65 } 66 67 int 68 _kvm_kvatop(kd, va, pa) 69 kvm_t *kd; 70 u_long va; 71 u_long *pa; 72 { 73 cpu_kcore_hdr_t *cpu_kh; 74 int rv, page_off; 75 alpha_pt_entry_t pte; 76 off_t pteoff; 77 78 if (ISALIVE(kd)) { 79 _kvm_err(kd, 0, "vatop called in live kernel!"); 80 return(0); 81 } 82 83 cpu_kh = kd->cpu_data; 84 page_off = va & (cpu_kh->page_size - 1); 85 86 if (va >= ALPHA_K0SEG_BASE && va <= ALPHA_K0SEG_END) { 87 /* 88 * Direct-mapped address: just convert it. 89 */ 90 91 *pa = ALPHA_K0SEG_TO_PHYS(va); 92 rv = cpu_kh->page_size - page_off; 93 } else if (va >= ALPHA_K1SEG_BASE && va <= ALPHA_K1SEG_END) { 94 /* 95 * Real kernel virtual address: do the translation. 96 */ 97 98 /* Find and read the L1 PTE. */ 99 pteoff = cpu_kh->lev1map_pa + 100 kvtol1pte(va) * sizeof(alpha_pt_entry_t); 101 if (lseek(kd->pmfd, _kvm_pa2off(kd, pteoff), 0) == -1 || 102 read(kd->pmfd, (char *)&pte, sizeof(pte)) != sizeof(pte)) { 103 _kvm_syserr(kd, 0, "could not read L1 PTE"); 104 goto lose; 105 } 106 107 /* Find and read the L2 PTE. */ 108 if ((pte & ALPHA_PTE_VALID) == 0) { 109 _kvm_err(kd, 0, "invalid translation (invalid L1 PTE)"); 110 goto lose; 111 } 112 pteoff = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size + 113 vatoste(va) * sizeof(alpha_pt_entry_t); 114 if (lseek(kd->pmfd, _kvm_pa2off(kd, pteoff), 0) == -1 || 115 read(kd->pmfd, (char *)&pte, sizeof(pte)) != sizeof(pte)) { 116 _kvm_syserr(kd, 0, "could not read L2 PTE"); 117 goto lose; 118 } 119 120 /* Find and read the L3 PTE. */ 121 if ((pte & ALPHA_PTE_VALID) == 0) { 122 _kvm_err(kd, 0, "invalid translation (invalid L2 PTE)"); 123 goto lose; 124 } 125 pteoff = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size + 126 vatopte(va) * sizeof(alpha_pt_entry_t); 127 if (lseek(kd->pmfd, _kvm_pa2off(kd, pteoff), 0) == -1 || 128 read(kd->pmfd, (char *)&pte, sizeof(pte)) != sizeof(pte)) { 129 _kvm_syserr(kd, 0, "could not read L3 PTE"); 130 goto lose; 131 } 132 133 /* Fill in the PA. */ 134 if ((pte & ALPHA_PTE_VALID) == 0) { 135 _kvm_err(kd, 0, "invalid translation (invalid L3 PTE)"); 136 goto lose; 137 } 138 *pa = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size + page_off + 139 vatopte(va) * sizeof(alpha_pt_entry_t); 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 off_t off; 164 cpu_kcore_hdr_t *cpu_kh; 165 166 cpu_kh = kd->cpu_data; 167 168 off = 0; 169 pa -= cpu_kh->core_seg.start; 170 171 return (kd->dump_off + off + pa); 172 } 173 174 /* 175 * Machine-dependent initialization for ALL open kvm descriptors, 176 * not just those for a kernel crash dump. Some architectures 177 * have to deal with these NOT being constants! (i.e. m68k) 178 */ 179 int 180 _kvm_mdopen(kd) 181 kvm_t *kd; 182 { 183 184 kd->usrstack = USRSTACK; 185 kd->min_uva = VM_MIN_ADDRESS; 186 kd->max_uva = VM_MAXUSER_ADDRESS; 187 188 return (0); 189 } 190