1 /* $NetBSD: kvm_alpha.c,v 1.27 2014/02/19 20:21:22 dsl 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/proc.h> 34 #include <sys/stat.h> 35 #include <sys/kcore.h> 36 #include <sys/types.h> 37 #include <unistd.h> 38 #include <nlist.h> 39 #include <kvm.h> 40 41 #include <uvm/uvm_extern.h> 42 43 #include <machine/kcore.h> 44 #include <machine/pmap.h> 45 #include <machine/vmparam.h> 46 47 #include <limits.h> 48 #include <db.h> 49 #include <stdlib.h> 50 51 #include "kvm_private.h" 52 53 __RCSID("$NetBSD: kvm_alpha.c,v 1.27 2014/02/19 20:21:22 dsl Exp $"); 54 55 /*ARGSUSED*/ 56 void 57 _kvm_freevtop(kvm_t *kd) 58 { 59 return; 60 } 61 62 /*ARGSUSED*/ 63 int 64 _kvm_initvtop(kvm_t *kd) 65 { 66 return (0); 67 } 68 69 int 70 _kvm_kvatop(kvm_t *kd, vaddr_t va, paddr_t *pa) 71 { 72 cpu_kcore_hdr_t *cpu_kh; 73 alpha_pt_entry_t pte; 74 u_long pteoff, page_off; 75 int rv; 76 77 if (ISALIVE(kd)) { 78 _kvm_err(kd, 0, "vatop called in live kernel!"); 79 return(0); 80 } 81 82 cpu_kh = kd->cpu_data; 83 page_off = va & (cpu_kh->page_size - 1); 84 85 if (va >= ALPHA_K0SEG_BASE && va <= ALPHA_K0SEG_END) { 86 /* 87 * Direct-mapped address: just convert it. 88 */ 89 90 *pa = ALPHA_K0SEG_TO_PHYS(va); 91 rv = cpu_kh->page_size - page_off; 92 } else if (va >= ALPHA_K1SEG_BASE && va <= ALPHA_K1SEG_END) { 93 /* 94 * Real kernel virtual address: do the translation. 95 */ 96 97 /* Find and read the L1 PTE. */ 98 pteoff = cpu_kh->lev1map_pa + 99 l1pte_index(va) * sizeof(alpha_pt_entry_t); 100 if (_kvm_pread(kd, kd->pmfd, &pte, sizeof(pte), 101 _kvm_pa2off(kd, pteoff)) != sizeof(pte)) { 102 _kvm_syserr(kd, 0, "could not read L1 PTE"); 103 goto lose; 104 } 105 106 /* Find and read the L2 PTE. */ 107 if ((pte & ALPHA_PTE_VALID) == 0) { 108 _kvm_err(kd, 0, "invalid translation (invalid L1 PTE)"); 109 goto lose; 110 } 111 pteoff = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size + 112 l2pte_index(va) * sizeof(alpha_pt_entry_t); 113 if (_kvm_pread(kd, kd->pmfd, &pte, sizeof(pte), 114 _kvm_pa2off(kd, pteoff)) != sizeof(pte)) { 115 _kvm_syserr(kd, 0, "could not read L2 PTE"); 116 goto lose; 117 } 118 119 /* Find and read the L3 PTE. */ 120 if ((pte & ALPHA_PTE_VALID) == 0) { 121 _kvm_err(kd, 0, "invalid translation (invalid L2 PTE)"); 122 goto lose; 123 } 124 pteoff = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size + 125 l3pte_index(va) * sizeof(alpha_pt_entry_t); 126 if (_kvm_pread(kd, kd->pmfd, &pte, sizeof(pte), 127 _kvm_pa2off(kd, pteoff)) != sizeof(pte)) { 128 _kvm_syserr(kd, 0, "could not read L3 PTE"); 129 goto lose; 130 } 131 132 /* Fill in the PA. */ 133 if ((pte & ALPHA_PTE_VALID) == 0) { 134 _kvm_err(kd, 0, "invalid translation (invalid L3 PTE)"); 135 goto lose; 136 } 137 *pa = ALPHA_PTE_TO_PFN(pte) * cpu_kh->page_size + page_off; 138 rv = cpu_kh->page_size - page_off; 139 } else { 140 /* 141 * Bogus address (not in KV space): punt. 142 */ 143 144 _kvm_err(kd, 0, "invalid kernel virtual address"); 145 lose: 146 *pa = -1; 147 rv = 0; 148 } 149 150 return (rv); 151 } 152 153 /* 154 * Translate a physical address to a file-offset in the crash dump. 155 */ 156 off_t 157 _kvm_pa2off(kvm_t *kd, paddr_t pa) 158 { 159 cpu_kcore_hdr_t *cpu_kh; 160 phys_ram_seg_t *ramsegs; 161 off_t off; 162 int i; 163 164 cpu_kh = kd->cpu_data; 165 ramsegs = (phys_ram_seg_t *)((char *)cpu_kh + ALIGN(sizeof *cpu_kh)); 166 167 off = 0; 168 for (i = 0; i < cpu_kh->nmemsegs; i++) { 169 if (pa >= ramsegs[i].start && 170 (pa - ramsegs[i].start) < ramsegs[i].size) { 171 off += (pa - ramsegs[i].start); 172 break; 173 } 174 off += ramsegs[i].size; 175 } 176 177 return (kd->dump_off + off); 178 } 179 180 /* 181 * Machine-dependent initialization for ALL open kvm descriptors, 182 * not just those for a kernel crash dump. Some architectures 183 * have to deal with these NOT being constants! (i.e. m68k) 184 */ 185 int 186 _kvm_mdopen(kvm_t *kd) 187 { 188 189 kd->usrstack = USRSTACK; 190 kd->min_uva = VM_MIN_ADDRESS; 191 kd->max_uva = VM_MAXUSER_ADDRESS; 192 193 return (0); 194 } 195