1 /* $NetBSD: kvm_i386.c,v 1.18 2001/08/05 03:33:15 matt 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. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 */ 39 40 #include <sys/cdefs.h> 41 #if defined(LIBC_SCCS) && !defined(lint) 42 #if 0 43 static char sccsid[] = "@(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93"; 44 #else 45 __RCSID("$NetBSD: kvm_i386.c,v 1.18 2001/08/05 03:33:15 matt Exp $"); 46 #endif 47 #endif /* LIBC_SCCS and not lint */ 48 49 /* 50 * i386 machine dependent routines for kvm. 51 */ 52 53 #include <sys/param.h> 54 #include <sys/user.h> 55 #include <sys/proc.h> 56 #include <sys/stat.h> 57 #include <sys/kcore.h> 58 #include <machine/kcore.h> 59 #include <stdlib.h> 60 #include <unistd.h> 61 #include <nlist.h> 62 #include <kvm.h> 63 64 #include <uvm/uvm_extern.h> 65 66 #include <limits.h> 67 #include <db.h> 68 69 #include "kvm_private.h" 70 71 #include <machine/pmap.h> 72 #include <machine/pte.h> 73 #include <machine/vmparam.h> 74 75 #ifndef btop 76 #define btop(x) (((unsigned)(x)) >> PGSHIFT) /* XXX */ 77 #define ptob(x) ((caddr_t)((x) << PGSHIFT)) /* XXX */ 78 #endif 79 80 void 81 _kvm_freevtop(kd) 82 kvm_t *kd; 83 { 84 85 /* Not actually used for anything right now, but safe. */ 86 if (kd->vmst != 0) 87 free(kd->vmst); 88 } 89 90 /*ARGSUSED*/ 91 int 92 _kvm_initvtop(kd) 93 kvm_t *kd; 94 { 95 96 return (0); 97 } 98 99 /* 100 * Translate a kernel virtual address to a physical address. 101 */ 102 int 103 _kvm_kvatop(kd, va, pa) 104 kvm_t *kd; 105 u_long va; 106 u_long *pa; 107 { 108 cpu_kcore_hdr_t *cpu_kh; 109 u_long page_off; 110 pd_entry_t pde; 111 pt_entry_t pte; 112 u_long pde_pa, pte_pa; 113 114 if (ISALIVE(kd)) { 115 _kvm_err(kd, 0, "vatop called in live kernel!"); 116 return (0); 117 } 118 119 cpu_kh = kd->cpu_data; 120 page_off = va & PGOFSET; 121 122 /* 123 * Find and read the page directory entry. 124 */ 125 pde_pa = cpu_kh->ptdpaddr + (pdei(va) * sizeof(pd_entry_t)); 126 if (pread(kd->pmfd, (void *)&pde, sizeof(pde), 127 _kvm_pa2off(kd, pde_pa)) != sizeof(pde)) { 128 _kvm_syserr(kd, 0, "could not read PDE"); 129 goto lose; 130 } 131 132 /* 133 * Find and read the page table entry. 134 */ 135 if ((pde & PG_V) == 0) { 136 _kvm_err(kd, 0, "invalid translation (invalid PDE)"); 137 goto lose; 138 } 139 pte_pa = (pde & PG_FRAME) + (ptei(va) * sizeof(pt_entry_t)); 140 if (pread(kd->pmfd, (void *) &pte, sizeof(pte), 141 _kvm_pa2off(kd, pte_pa)) != sizeof(pte)) { 142 _kvm_syserr(kd, 0, "could not read PTE"); 143 goto lose; 144 } 145 146 /* 147 * Validate the PTE and return the physical address. 148 */ 149 if ((pte & PG_V) == 0) { 150 _kvm_err(kd, 0, "invalid translation (invalid PTE)"); 151 goto lose; 152 } 153 *pa = (pte & PG_FRAME) + page_off; 154 return (int)(NBPG - page_off); 155 156 lose: 157 *pa = (u_long)~0L; 158 return (0); 159 } 160 161 /* 162 * Translate a physical address to a file-offset in the crash dump. 163 */ 164 off_t 165 _kvm_pa2off(kd, pa) 166 kvm_t *kd; 167 u_long pa; 168 { 169 cpu_kcore_hdr_t *cpu_kh; 170 phys_ram_seg_t *ramsegs; 171 off_t off; 172 int i; 173 174 cpu_kh = kd->cpu_data; 175 ramsegs = (void *)((char *)(void *)cpu_kh + ALIGN(sizeof *cpu_kh)); 176 177 off = 0; 178 for (i = 0; i < cpu_kh->nmemsegs; i++) { 179 if (pa >= ramsegs[i].start && 180 (pa - ramsegs[i].start) < ramsegs[i].size) { 181 off += (pa - ramsegs[i].start); 182 break; 183 } 184 off += ramsegs[i].size; 185 } 186 187 return (kd->dump_off + off); 188 } 189 190 /* 191 * Machine-dependent initialization for ALL open kvm descriptors, 192 * not just those for a kernel crash dump. Some architectures 193 * have to deal with these NOT being constants! (i.e. m68k) 194 */ 195 int 196 _kvm_mdopen(kd) 197 kvm_t *kd; 198 { 199 200 kd->usrstack = USRSTACK; 201 kd->min_uva = VM_MIN_ADDRESS; 202 kd->max_uva = VM_MAXUSER_ADDRESS; 203 204 return (0); 205 } 206