1 /* $OpenBSD: kvm_mips64.c,v 1.2 2004/09/15 19:31:31 miod Exp $ */ 2 /* $NetBSD: kvm_mips.c,v 1.3 1996/03/18 22:33:44 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. Modified for MIPS by Ralph Campbell. 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_mips.c 8.1 (Berkeley) 6/4/93"; 44 #else 45 static char *rcsid = "$OpenBSD: kvm_mips64.c,v 1.2 2004/09/15 19:31:31 miod Exp $"; 46 #endif 47 #endif /* LIBC_SCCS and not lint */ 48 49 /* 50 * MIPS 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 <unistd.h> 59 #include <stdlib.h> 60 #include <nlist.h> 61 #include <kvm.h> 62 63 #include <limits.h> 64 #include <db.h> 65 66 #include "kvm_private.h" 67 68 #include <machine/cpu.h> 69 #include <machine/pte.h> 70 #include <machine/pmap.h> 71 72 struct vmstate { 73 pt_entry_t *Sysmap; 74 u_int Sysmapsize; 75 }; 76 77 #define KREAD(kd, addr, p)\ 78 (kvm_read(kd, addr, (char *)(p), sizeof(*(p))) != sizeof(*(p))) 79 80 void 81 _kvm_freevtop(kvm_t *kd) 82 { 83 if (kd->vmst != 0) 84 free(kd->vmst); 85 } 86 87 int 88 _kvm_initvtop(kvm_t *kd) 89 { 90 struct vmstate *vm; 91 struct nlist nlist[3]; 92 93 vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm)); 94 if (vm == 0) 95 return (-1); 96 kd->vmst = vm; 97 98 nlist[0].n_name = "Sysmap"; 99 nlist[1].n_name = "Sysmapsize"; 100 nlist[2].n_name = 0; 101 102 if (kvm_nlist(kd, nlist) != 0) { 103 _kvm_err(kd, kd->program, "bad namelist"); 104 return (-1); 105 } 106 if (KREAD(kd, (u_long)nlist[0].n_value, &vm->Sysmap)) { 107 _kvm_err(kd, kd->program, "cannot read Sysmap"); 108 return (-1); 109 } 110 if (KREAD(kd, (u_long)nlist[1].n_value, &vm->Sysmapsize)) { 111 _kvm_err(kd, kd->program, "cannot read mmutype"); 112 return (-1); 113 } 114 return (0); 115 } 116 117 /* 118 * Translate a kernel virtual address to a physical address. 119 */ 120 int 121 _kvm_kvatop(kvm_t *kd, u_long va, u_long *pa) 122 { 123 struct vmstate *vm; 124 u_long pte, addr, offset; 125 126 if (ISALIVE(kd)) { 127 _kvm_err(kd, 0, "vatop called in live kernel!"); 128 return((off_t)0); 129 } 130 vm = kd->vmst; 131 offset = va & PGOFSET; 132 /* 133 * If we are initializing (kernel segment table pointer not yet set) 134 * then return pa == va to avoid infinite recursion. 135 */ 136 if (vm->Sysmap == 0) { 137 *pa = va; 138 return (NBPG - offset); 139 } 140 if (va < KERNBASE || 141 va >= VM_MIN_KERNEL_ADDRESS + vm->Sysmapsize * NBPG) 142 goto invalid; 143 if (va < VM_MIN_KERNEL_ADDRESS) { 144 *pa = KSEG0_TO_PHYS(va); 145 return (NBPG - offset); 146 } 147 addr = (u_long)(vm->Sysmap + ((va - VM_MIN_KERNEL_ADDRESS) >> PGSHIFT)); 148 /* 149 * Can't use KREAD to read kernel segment table entries. 150 * Fortunately it is 1-to-1 mapped so we don't have to. 151 */ 152 if (_kvm_pread(kd, kd->pmfd, (char *)&pte, sizeof(pte), (off_t)addr) < 0) 153 goto invalid; 154 if (!(pte & PG_V)) 155 goto invalid; 156 *pa = (pte & PG_FRAME) | offset; 157 return (NBPG - offset); 158 159 invalid: 160 _kvm_err(kd, 0, "invalid address (%lx)", va); 161 return (0); 162 } 163 164 off_t 165 _kvm_pa2off(kvm_t *kd, u_long pa) 166 { 167 _kvm_err(kd, 0, "pa2off going to be implemented!"); 168 return 0; 169 } 170