1 /* $NetBSD: kvm_alpha.c,v 1.26 2014/01/27 21:00:01 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 <sys/types.h> 38 #include <unistd.h> 39 #include <nlist.h> 40 #include <kvm.h> 41 42 #include <uvm/uvm_extern.h> 43 44 #include <machine/kcore.h> 45 #include <machine/pmap.h> 46 #include <machine/vmparam.h> 47 48 #include <limits.h> 49 #include <db.h> 50 #include <stdlib.h> 51 52 #include "kvm_private.h" 53 54 __RCSID("$NetBSD: kvm_alpha.c,v 1.26 2014/01/27 21:00:01 matt Exp $"); 55 56 /*ARGSUSED*/ 57 void 58 _kvm_freevtop(kvm_t *kd) 59 { 60 return; 61 } 62 63 /*ARGSUSED*/ 64 int 65 _kvm_initvtop(kvm_t *kd) 66 { 67 return (0); 68 } 69 70 int 71 _kvm_kvatop(kvm_t *kd, vaddr_t va, paddr_t *pa) 72 { 73 cpu_kcore_hdr_t *cpu_kh; 74 alpha_pt_entry_t pte; 75 u_long pteoff, page_off; 76 int rv; 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 l1pte_index(va) * sizeof(alpha_pt_entry_t); 101 if (_kvm_pread(kd, kd->pmfd, &pte, sizeof(pte), 102 _kvm_pa2off(kd, pteoff)) != 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 l2pte_index(va) * sizeof(alpha_pt_entry_t); 114 if (_kvm_pread(kd, kd->pmfd, &pte, sizeof(pte), 115 _kvm_pa2off(kd, pteoff)) != 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 l3pte_index(va) * sizeof(alpha_pt_entry_t); 127 if (_kvm_pread(kd, kd->pmfd, &pte, sizeof(pte), 128 _kvm_pa2off(kd, pteoff)) != 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 rv = cpu_kh->page_size - page_off; 140 } else { 141 /* 142 * Bogus address (not in KV space): punt. 143 */ 144 145 _kvm_err(kd, 0, "invalid kernel virtual address"); 146 lose: 147 *pa = -1; 148 rv = 0; 149 } 150 151 return (rv); 152 } 153 154 /* 155 * Translate a physical address to a file-offset in the crash dump. 156 */ 157 off_t 158 _kvm_pa2off(kvm_t *kd, paddr_t pa) 159 { 160 cpu_kcore_hdr_t *cpu_kh; 161 phys_ram_seg_t *ramsegs; 162 off_t off; 163 int i; 164 165 cpu_kh = kd->cpu_data; 166 ramsegs = (phys_ram_seg_t *)((char *)cpu_kh + ALIGN(sizeof *cpu_kh)); 167 168 off = 0; 169 for (i = 0; i < cpu_kh->nmemsegs; i++) { 170 if (pa >= ramsegs[i].start && 171 (pa - ramsegs[i].start) < ramsegs[i].size) { 172 off += (pa - ramsegs[i].start); 173 break; 174 } 175 off += ramsegs[i].size; 176 } 177 178 return (kd->dump_off + off); 179 } 180 181 /* 182 * Machine-dependent initialization for ALL open kvm descriptors, 183 * not just those for a kernel crash dump. Some architectures 184 * have to deal with these NOT being constants! (i.e. m68k) 185 */ 186 int 187 _kvm_mdopen(kvm_t *kd) 188 { 189 190 kd->usrstack = USRSTACK; 191 kd->min_uva = VM_MIN_ADDRESS; 192 kd->max_uva = VM_MAXUSER_ADDRESS; 193 194 return (0); 195 } 196