1 /* $NetBSD: kvm_i386.c,v 1.30 2014/02/19 20:21:22 dsl Exp $ */ 2 3 /*- 4 * Copyright (c) 1989, 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software developed by the Computer Systems 8 * Engineering group at Lawrence Berkeley Laboratory under DARPA contract 9 * BG 91-66 and contributed to Berkeley. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93"; 40 #else 41 __RCSID("$NetBSD: kvm_i386.c,v 1.30 2014/02/19 20:21:22 dsl Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 /* 46 * i386 machine dependent routines for kvm. 47 */ 48 49 #include <sys/param.h> 50 #include <sys/stat.h> 51 #include <sys/kcore.h> 52 #include <sys/types.h> 53 54 #include <stdlib.h> 55 #include <unistd.h> 56 #include <nlist.h> 57 #include <kvm.h> 58 59 #include <uvm/uvm_extern.h> 60 61 #include <limits.h> 62 #include <db.h> 63 64 #include "kvm_private.h" 65 66 #include <i386/kcore.h> 67 #include <i386/pmap.h> 68 #include <i386/pte.h> 69 #include <i386/vmparam.h> 70 71 #ifndef btop 72 #define btop(x) (((unsigned)(x)) >> PGSHIFT) /* XXX */ 73 #define ptob(x) ((caddr_t)((x) << PGSHIFT)) /* XXX */ 74 #endif 75 76 /* 77 * Indicates whether PAE is in use for the kernel image 78 * 0: native i386 memory mappings 79 * 1: i386 PAE mappings 80 */ 81 static int i386_use_pae; 82 83 int _kvm_kvatop_i386(kvm_t *, vaddr_t, paddr_t *); 84 int _kvm_kvatop_i386pae(kvm_t *, vaddr_t, paddr_t *); 85 86 void 87 _kvm_freevtop(kvm_t *kd) 88 { 89 90 /* Not actually used for anything right now, but safe. */ 91 if (kd->vmst != 0) 92 free(kd->vmst); 93 } 94 95 /*ARGSUSED*/ 96 int 97 _kvm_initvtop(kvm_t *kd) 98 { 99 cpu_kcore_hdr_t *cpu_kh = kd->cpu_data; 100 101 i386_use_pae = 0; /* default: non PAE mode */ 102 if ((cpu_kh->pdppaddr & I386_KCORE_PAE) == I386_KCORE_PAE) 103 i386_use_pae = 1; 104 105 return 0; 106 } 107 108 /* 109 * Translate a kernel virtual address to a physical address. 110 */ 111 int 112 _kvm_kvatop(kvm_t *kd, vaddr_t va, paddr_t *pa) 113 { 114 115 if (ISALIVE(kd)) { 116 _kvm_err(kd, 0, "vatop called in live kernel!"); 117 return 0; 118 } 119 120 switch (i386_use_pae) { 121 default: 122 case 0: 123 return _kvm_kvatop_i386(kd, va, pa); 124 case 1: 125 return _kvm_kvatop_i386pae(kd, va, pa); 126 } 127 128 } 129 130 /* 131 * Used to translate a virtual address to a physical address for systems 132 * with PAE mode disabled. Only two levels of virtual memory pages are 133 * dereferenced (L2 PDEs, then L1 PTEs). 134 */ 135 int 136 _kvm_kvatop_i386(kvm_t *kd, vaddr_t va, paddr_t *pa) 137 { 138 cpu_kcore_hdr_t *cpu_kh; 139 u_long page_off; 140 pd_entry_t pde; 141 pt_entry_t pte; 142 paddr_t pde_pa, pte_pa; 143 144 cpu_kh = kd->cpu_data; 145 page_off = va & PGOFSET; 146 147 /* 148 * Find and read the page directory entry. 149 * pdppaddr being PAGE_SIZE aligned, we mask the option bits. 150 */ 151 pde_pa = (cpu_kh->pdppaddr & PG_FRAME) + (pl2_pi(va) * sizeof(pde)); 152 if (_kvm_pread(kd, kd->pmfd, (void *)&pde, sizeof(pde), 153 _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) { 154 _kvm_syserr(kd, 0, "could not read PDE"); 155 goto lose; 156 } 157 158 /* 159 * Find and read the page table entry. 160 */ 161 if ((pde & PG_V) == 0) { 162 _kvm_err(kd, 0, "invalid translation (invalid PDE)"); 163 goto lose; 164 } 165 if ((pde & PG_PS) != 0) { 166 /* 167 * This is a 4MB page. 168 */ 169 page_off = va & ~PG_LGFRAME; 170 *pa = (pde & PG_LGFRAME) + page_off; 171 return (int)(NBPD_L2 - page_off); 172 } 173 pte_pa = (pde & PG_FRAME) + (pl1_pi(va) * sizeof(pt_entry_t)); 174 if (_kvm_pread(kd, kd->pmfd, (void *) &pte, sizeof(pte), 175 _kvm_pa2off(kd, pte_pa)) != sizeof(pte)) { 176 _kvm_syserr(kd, 0, "could not read PTE"); 177 goto lose; 178 } 179 180 /* 181 * Validate the PTE and return the physical address. 182 */ 183 if ((pte & PG_V) == 0) { 184 _kvm_err(kd, 0, "invalid translation (invalid PTE)"); 185 goto lose; 186 } 187 *pa = (pte & PG_FRAME) + page_off; 188 return (int)(NBPG - page_off); 189 190 lose: 191 *pa = (paddr_t)~0L; 192 return 0; 193 } 194 195 /* 196 * Translate a physical address to a file-offset in the crash dump. 197 */ 198 off_t 199 _kvm_pa2off(kvm_t *kd, paddr_t pa) 200 { 201 cpu_kcore_hdr_t *cpu_kh; 202 phys_ram_seg_t *ramsegs; 203 off_t off; 204 int i; 205 206 cpu_kh = kd->cpu_data; 207 ramsegs = (void *)((char *)(void *)cpu_kh + ALIGN(sizeof *cpu_kh)); 208 209 off = 0; 210 for (i = 0; i < cpu_kh->nmemsegs; i++) { 211 if (pa >= ramsegs[i].start && 212 (pa - ramsegs[i].start) < ramsegs[i].size) { 213 off += (pa - ramsegs[i].start); 214 break; 215 } 216 off += ramsegs[i].size; 217 } 218 219 return (kd->dump_off + off); 220 } 221 222 /* 223 * Machine-dependent initialization for ALL open kvm descriptors, 224 * not just those for a kernel crash dump. Some architectures 225 * have to deal with these NOT being constants! (i.e. m68k) 226 */ 227 int 228 _kvm_mdopen(kvm_t *kd) 229 { 230 231 kd->usrstack = USRSTACK; 232 kd->min_uva = VM_MIN_ADDRESS; 233 kd->max_uva = VM_MAXUSER_ADDRESS; 234 235 return 0; 236 } 237