1 /* $OpenBSD: kvm_i386.c,v 1.3 1996/05/05 14:57:20 deraadt 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 1.3 1996/05/05 14:57:20 deraadt 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 <vm/vm.h> 64 #include <vm/vm_param.h> 65 66 #include <limits.h> 67 #include <db.h> 68 69 #include "kvm_private.h" 70 71 #include <machine/pte.h> 72 73 #ifndef btop 74 #define btop(x) (((unsigned)(x)) >> PGSHIFT) /* XXX */ 75 #define ptob(x) ((caddr_t)((x) << PGSHIFT)) /* XXX */ 76 #endif 77 78 struct vmstate { 79 pd_entry_t *PTD; 80 }; 81 82 void 83 _kvm_freevtop(kd) 84 kvm_t *kd; 85 { 86 if (kd->vmst != 0) { 87 if (kd->vmst->PTD != 0) 88 free(kd->vmst->PTD); 89 90 free(kd->vmst); 91 } 92 } 93 94 int 95 _kvm_initvtop(kd) 96 kvm_t *kd; 97 { 98 struct vmstate *vm; 99 struct nlist nlist[2]; 100 u_long pa; 101 102 vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm)); 103 if (vm == 0) 104 return (-1); 105 kd->vmst = vm; 106 107 nlist[0].n_name = "_PTDpaddr"; 108 nlist[1].n_name = 0; 109 110 if (kvm_nlist(kd, nlist) != 0) { 111 _kvm_err(kd, kd->program, "bad namelist"); 112 return (-1); 113 } 114 115 vm->PTD = 0; 116 117 if (lseek(kd->pmfd, (off_t)(nlist[0].n_value - KERNBASE), 0) == -1 && 118 errno != 0) { 119 _kvm_syserr(kd, kd->program, "kvm_lseek"); 120 goto invalid; 121 } 122 if (read(kd->pmfd, &pa, sizeof pa) != sizeof pa) { 123 _kvm_syserr(kd, kd->program, "kvm_read"); 124 goto invalid; 125 } 126 127 vm->PTD = (pd_entry_t *)_kvm_malloc(kd, NBPG); 128 129 if (lseek(kd->pmfd, (off_t)pa, 0) == -1 && errno != 0) { 130 _kvm_syserr(kd, kd->program, "kvm_lseek"); 131 goto invalid; 132 } 133 if (read(kd->pmfd, vm->PTD, NBPG) != NBPG) { 134 _kvm_syserr(kd, kd->program, "kvm_read"); 135 goto invalid; 136 } 137 138 return (0); 139 140 invalid: 141 if (vm->PTD != 0) 142 free(vm->PTD); 143 return (-1); 144 } 145 146 /* 147 * Translate a kernel virtual address to a physical address. 148 */ 149 int 150 _kvm_kvatop(kd, va, pa) 151 kvm_t *kd; 152 u_long va; 153 u_long *pa; 154 { 155 struct vmstate *vm; 156 u_long offset; 157 u_long pte_pa; 158 pt_entry_t pte; 159 160 if (ISALIVE(kd)) { 161 _kvm_err(kd, 0, "vatop called in live kernel!"); 162 return(0); 163 } 164 165 vm = kd->vmst; 166 offset = va & PGOFSET; 167 168 /* 169 * If we are initializing (kernel page table descriptor pointer 170 * not yet set) * then return pa == va to avoid infinite recursion. 171 */ 172 if (vm->PTD == 0) { 173 *pa = va; 174 return (NBPG - offset); 175 } 176 if ((vm->PTD[pdei(va)] & PG_V) == 0) 177 goto invalid; 178 179 pte_pa = (vm->PTD[pdei(va)] & PG_FRAME) + 180 (ptei(va) * sizeof(pt_entry_t)); 181 /* XXX READ PHYSICAL XXX */ 182 { 183 if (lseek(kd->pmfd, (off_t)pte_pa, 0) == -1 && errno != 0) { 184 _kvm_syserr(kd, kd->program, "kvm_lseek"); 185 goto invalid; 186 } 187 if (read(kd->pmfd, &pte, sizeof pte) != sizeof pte) { 188 _kvm_syserr(kd, kd->program, "kvm_read"); 189 goto invalid; 190 } 191 } 192 193 *pa = (pte & PG_FRAME) + offset; 194 return (NBPG - offset); 195 196 invalid: 197 _kvm_err(kd, 0, "invalid address (%x)", va); 198 return (0); 199 } 200