1 /* $NetBSD: kvm_alpha.c,v 1.24 2010/09/19 02:07:00 jym 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(kvm_t *kd) 55 { 56 return; 57 } 58 59 /*ARGSUSED*/ 60 int 61 _kvm_initvtop(kvm_t *kd) 62 { 63 return (0); 64 } 65 66 int 67 _kvm_kvatop(kvm_t *kd, u_long va, u_long *pa) 68 { 69 cpu_kcore_hdr_t *cpu_kh; 70 alpha_pt_entry_t pte; 71 u_long pteoff, page_off; 72 int rv; 73 74 if (ISALIVE(kd)) { 75 _kvm_err(kd, 0, "vatop called in live kernel!"); 76 return(0); 77 } 78 79 cpu_kh = kd->cpu_data; 80 page_off = va & (cpu_kh->page_size - 1); 81 82 if (va >= ALPHA_K0SEG_BASE && va <= ALPHA_K0SEG_END) { 83 /* 84 * Direct-mapped address: just convert it. 85 */ 86 87 *pa = ALPHA_K0SEG_TO_PHYS(va); 88 rv = cpu_kh->page_size - page_off; 89 } else if (va >= ALPHA_K1SEG_BASE && va <= ALPHA_K1SEG_END) { 90 /* 91 * Real kernel virtual address: do the translation. 92 */ 93 94 /* Find and read the L1 PTE. */ 95 pteoff = cpu_kh->lev1map_pa + 96 l1pte_index(va) * sizeof(alpha_pt_entry_t); 97 if (_kvm_pread(kd, kd->pmfd, &pte, sizeof(pte), 98 _kvm_pa2off(kd, pteoff)) != sizeof(pte)) { 99 _kvm_syserr(kd, 0, "could not read L1 PTE"); 100 goto lose; 101 } 102 103 /* Find and read the L2 PTE. */ 104 if ((pte & ALPHA_PTE_VALID) == 0) { 105 _kvm_err(kd, 0, "invalid translation (invalid L1 PTE)"); 106 goto lose; 107 } 108 pteoff = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size + 109 l2pte_index(va) * sizeof(alpha_pt_entry_t); 110 if (_kvm_pread(kd, kd->pmfd, &pte, sizeof(pte), 111 _kvm_pa2off(kd, pteoff)) != sizeof(pte)) { 112 _kvm_syserr(kd, 0, "could not read L2 PTE"); 113 goto lose; 114 } 115 116 /* Find and read the L3 PTE. */ 117 if ((pte & ALPHA_PTE_VALID) == 0) { 118 _kvm_err(kd, 0, "invalid translation (invalid L2 PTE)"); 119 goto lose; 120 } 121 pteoff = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size + 122 l3pte_index(va) * sizeof(alpha_pt_entry_t); 123 if (_kvm_pread(kd, kd->pmfd, &pte, sizeof(pte), 124 _kvm_pa2off(kd, pteoff)) != sizeof(pte)) { 125 _kvm_syserr(kd, 0, "could not read L3 PTE"); 126 goto lose; 127 } 128 129 /* Fill in the PA. */ 130 if ((pte & ALPHA_PTE_VALID) == 0) { 131 _kvm_err(kd, 0, "invalid translation (invalid L3 PTE)"); 132 goto lose; 133 } 134 *pa = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size + page_off; 135 rv = cpu_kh->page_size - page_off; 136 } else { 137 /* 138 * Bogus address (not in KV space): punt. 139 */ 140 141 _kvm_err(kd, 0, "invalid kernel virtual address"); 142 lose: 143 *pa = -1; 144 rv = 0; 145 } 146 147 return (rv); 148 } 149 150 /* 151 * Translate a physical address to a file-offset in the crash dump. 152 */ 153 off_t 154 _kvm_pa2off(kvm_t *kd, u_long pa) 155 { 156 cpu_kcore_hdr_t *cpu_kh; 157 phys_ram_seg_t *ramsegs; 158 off_t off; 159 int i; 160 161 cpu_kh = kd->cpu_data; 162 ramsegs = (phys_ram_seg_t *)((char *)cpu_kh + ALIGN(sizeof *cpu_kh)); 163 164 off = 0; 165 for (i = 0; i < cpu_kh->nmemsegs; i++) { 166 if (pa >= ramsegs[i].start && 167 (pa - ramsegs[i].start) < ramsegs[i].size) { 168 off += (pa - ramsegs[i].start); 169 break; 170 } 171 off += ramsegs[i].size; 172 } 173 174 return (kd->dump_off + off); 175 } 176 177 /* 178 * Machine-dependent initialization for ALL open kvm descriptors, 179 * not just those for a kernel crash dump. Some architectures 180 * have to deal with these NOT being constants! (i.e. m68k) 181 */ 182 int 183 _kvm_mdopen(kvm_t *kd) 184 { 185 186 kd->usrstack = USRSTACK; 187 kd->min_uva = VM_MIN_ADDRESS; 188 kd->max_uva = VM_MAXUSER_ADDRESS; 189 190 return (0); 191 } 192