1 /* $OpenBSD: kvm_i386.c,v 1.10 2001/12/05 02:23:11 art Exp $ */ 2 /* $NetBSD: kvm_i386.c,v 1.9 1996/03/18 22:33:38 thorpej Exp $ */ 3 4 /*- 5 * Copyright (c) 1989, 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software developed by the Computer Systems 9 * Engineering group at Lawrence Berkeley Laboratory under DARPA contract 10 * BG 91-66 and contributed to Berkeley. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 */ 40 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 static char *rcsid = "$OpenBSD: kvm_i386.c,v 1.10 2001/12/05 02:23:11 art Exp $"; 46 #endif 47 #endif /* LIBC_SCCS and not lint */ 48 49 /* 50 * i386 machine dependent routines for kvm. Hopefully, the forthcoming 51 * vm code will one day obsolete this module. 52 */ 53 54 #include <sys/param.h> 55 #include <sys/user.h> 56 #include <sys/proc.h> 57 #include <sys/stat.h> 58 #include <stdlib.h> 59 #include <unistd.h> 60 #include <nlist.h> 61 #include <kvm.h> 62 63 #include <uvm/uvm_extern.h> 64 #include <machine/vmparam.h> 65 #include <machine/pmap.h> 66 67 #include <limits.h> 68 #include <db.h> 69 70 #include "kvm_private.h" 71 72 #include <machine/pte.h> 73 74 struct vmstate { 75 pd_entry_t *PTD; 76 }; 77 78 void 79 _kvm_freevtop(kd) 80 kvm_t *kd; 81 { 82 if (kd->vmst != 0) { 83 if (kd->vmst->PTD != 0) 84 free(kd->vmst->PTD); 85 86 free(kd->vmst); 87 } 88 } 89 90 int 91 _kvm_initvtop(kd) 92 kvm_t *kd; 93 { 94 struct vmstate *vm; 95 struct nlist nlist[2]; 96 u_long pa; 97 98 vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm)); 99 if (vm == 0) 100 return (-1); 101 kd->vmst = vm; 102 103 nlist[0].n_name = "_PTDpaddr"; 104 nlist[1].n_name = 0; 105 106 if (kvm_nlist(kd, nlist) != 0) { 107 _kvm_err(kd, kd->program, "bad namelist"); 108 return (-1); 109 } 110 111 vm->PTD = 0; 112 113 if (_kvm_pread(kd, kd->pmfd, &pa, sizeof pa, (off_t)_kvm_pa2off(kd, nlist[0].n_value - KERNBASE)) != sizeof pa) { 114 goto invalid; 115 } 116 117 vm->PTD = (pd_entry_t *)_kvm_malloc(kd, NBPG); 118 119 if (_kvm_pread(kd, kd->pmfd, vm->PTD, NBPG, (off_t)_kvm_pa2off(kd, pa)) != NBPG) { 120 goto invalid; 121 } 122 123 return (0); 124 125 invalid: 126 if (vm->PTD != 0) 127 free(vm->PTD); 128 return (-1); 129 } 130 131 /* 132 * Translate a kernel virtual address to a physical address. 133 */ 134 int 135 _kvm_kvatop(kd, va, pa) 136 kvm_t *kd; 137 u_long va; 138 u_long *pa; 139 { 140 struct vmstate *vm; 141 u_long offset; 142 u_long pte_pa; 143 pt_entry_t pte; 144 145 if (ISALIVE(kd)) { 146 _kvm_err(kd, 0, "vatop called in live kernel!"); 147 return(0); 148 } 149 150 vm = kd->vmst; 151 offset = va & PGOFSET; 152 153 /* 154 * If we are initializing (kernel page table descriptor pointer 155 * not yet set) * then return pa == va to avoid infinite recursion. 156 */ 157 if (vm->PTD == 0) { 158 *pa = va; 159 return (NBPG - offset); 160 } 161 if ((vm->PTD[pdei(va)] & PG_V) == 0) 162 goto invalid; 163 164 pte_pa = (vm->PTD[pdei(va)] & PG_FRAME) + 165 (ptei(va) * sizeof(pt_entry_t)); 166 /* XXX READ PHYSICAL XXX */ 167 { 168 if (_kvm_pread(kd, kd->pmfd, &pte, sizeof pte, (off_t)_kvm_pa2off(kd, pte_pa)) != sizeof pte) { 169 goto invalid; 170 } 171 } 172 173 *pa = (pte & PG_FRAME) + offset; 174 return (NBPG - offset); 175 176 invalid: 177 _kvm_err(kd, 0, "invalid address (%lx)", va); 178 return (0); 179 } 180 181 /* 182 * Translate a physical address to a file-offset in the crash-dump. 183 */ 184 off_t 185 _kvm_pa2off(kd, pa) 186 kvm_t *kd; 187 u_long pa; 188 { 189 return((off_t)(kd->dump_off + pa)); 190 } 191