1 /* $NetBSD: kvm_mips.c,v 1.7 1997/08/15 02:22:00 mikel 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. Modified for MIPS by Ralph Campbell. 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_mips.c 8.1 (Berkeley) 6/4/93"; 44 #else 45 __RCSID("$NetBSD: kvm_mips.c,v 1.7 1997/08/15 02:22:00 mikel 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 <nlist.h> 60 #include <kvm.h> 61 62 #include <vm/vm.h> 63 #include <vm/vm_param.h> 64 65 #include <limits.h> 66 #include <db.h> 67 68 #include "kvm_private.h" 69 70 #include <mips/cpuregs.h> 71 #include <mips/mips1_pte.h> 72 #include <mips/mips3_pte.h> 73 #include <mips/pmap.h> 74 75 struct vmstate { 76 /*pt_entry_t*/u_int *Sysmap; 77 u_int Sysmapsize; 78 u_int cpu_arch; 79 }; 80 81 #define KREAD(kd, addr, p)\ 82 (kvm_read(kd, addr, (char *)(p), sizeof(*(p))) != sizeof(*(p))) 83 84 void 85 _kvm_freevtop(kd) 86 kvm_t *kd; 87 { 88 if (kd->vmst != 0) 89 free(kd->vmst); 90 } 91 92 int 93 _kvm_initvtop(kd) 94 kvm_t *kd; 95 { 96 struct vmstate *vm; 97 struct nlist nlist[4]; 98 99 vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm)); 100 if (vm == 0) 101 return (-1); 102 kd->vmst = vm; 103 104 nlist[0].n_name = "cpu_arch"; 105 nlist[1].n_name = "Sysmap"; 106 nlist[2].n_name = "Sysmapsize"; 107 nlist[3].n_name = 0; 108 109 if (kvm_nlist(kd, nlist) != 0) { 110 _kvm_err(kd, kd->program, "bad namelist"); 111 return (-1); 112 } 113 if (KREAD(kd, (u_long)nlist[0].n_value, &vm->cpu_arch)) { 114 _kvm_err(kd, kd->program, "cannot read cpu_arch"); 115 return (-1); 116 } 117 if (KREAD(kd, (u_long)nlist[1].n_value, &vm->Sysmap)) { 118 _kvm_err(kd, kd->program, "cannot read Sysmap"); 119 return (-1); 120 } 121 if (KREAD(kd, (u_long)nlist[2].n_value, &vm->Sysmapsize)) { 122 _kvm_err(kd, kd->program, "cannot read mmutype"); 123 return (-1); 124 } 125 return (0); 126 } 127 128 /* 129 * Translate a kernel virtual address to a physical address. 130 */ 131 int 132 _kvm_kvatop(kd, va, pa) 133 kvm_t *kd; 134 u_long va; 135 u_long *pa; 136 { 137 register struct vmstate *vm; 138 u_long pte, addr, offset; 139 140 u_int pgshift, pg_v, pg_frame; 141 142 if (ISALIVE(kd)) { 143 _kvm_err(kd, 0, "vatop called in live kernel!"); 144 return((off_t)0); 145 } 146 147 /* Compute TLB offsets for the level of mips cpu we're running on */ 148 switch (vm->cpu_arch) { 149 case 1: 150 pgshift = MIPS1_PG_SHIFT; 151 pg_v = MIPS1_PG_V; 152 pg_frame = MIPS1_PG_FRAME; 153 break; 154 155 case 3: 156 pgshift = MIPS3_PG_SHIFT; 157 pg_v = MIPS3_PG_V; 158 pg_frame = MIPS3_PG_FRAME; 159 break; 160 161 default: 162 _kvm_err(kd, 0, "unknown or unsupported mips CPU family!"); 163 return((off_t)0); 164 } 165 166 vm = kd->vmst; 167 offset = va & PGOFSET; 168 /* 169 * If we are initializing (kernel segment table pointer not yet set) 170 * then return pa == va to avoid infinite recursion. 171 */ 172 if (vm->Sysmap == 0) { 173 *pa = va; 174 return (NBPG - offset); 175 } 176 if (va < KERNBASE || 177 va >= VM_MIN_KERNEL_ADDRESS + vm->Sysmapsize * NBPG) 178 goto invalid; 179 if (va < VM_MIN_KERNEL_ADDRESS) { 180 *pa = MIPS_KSEG0_TO_PHYS(va); 181 return (NBPG - offset); 182 } 183 addr = (u_long)(vm->Sysmap + 184 ((va - VM_MIN_KERNEL_ADDRESS) >> pgshift)); 185 186 /* 187 * Can't use KREAD to read kernel segment table entries. 188 * Fortunately it is 1-to-1 mapped so we don't have to. 189 */ 190 if (lseek(kd->pmfd, (off_t)addr, 0) < 0 || 191 read(kd->pmfd, (char *)&pte, sizeof(pte)) < 0) 192 goto invalid; 193 if (!(pte & pg_v)) 194 goto invalid; 195 *pa = (pte & pg_frame) | offset; 196 return (NBPG - offset); 197 198 invalid: 199 _kvm_err(kd, 0, "invalid address (%x)", va); 200 return (0); 201 } 202 203 /* 204 * Machine-dependent initialization for ALL open kvm descriptors, 205 * not just those for a kernel crash dump. Some architectures 206 * have to deal with these NOT being constants! (i.e. m68k) 207 */ 208 int 209 _kvm_mdopen(kd) 210 kvm_t *kd; 211 { 212 213 kd->usrstack = USRSTACK; 214 kd->min_uva = VM_MIN_ADDRESS; 215 kd->max_uva = VM_MAXUSER_ADDRESS; 216 217 return (0); 218 } 219