1 /* $NetBSD: kvm_mips.c,v 1.8 1997/10/20 19:43:26 jonathan 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 1.8 1997/10/20 19:43:26 jonathan 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 <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 <mips/cpuregs.h> 72 #include <mips/mips1_pte.h> 73 #include <mips/mips3_pte.h> 74 #include <mips/pmap.h> 75 76 struct vmstate { 77 /*pt_entry_t*/u_int *Sysmap; 78 u_int Sysmapsize; 79 u_int cpu_arch; 80 }; 81 82 #define KREAD(kd, addr, p)\ 83 (kvm_read(kd, addr, (char *)(p), sizeof(*(p))) != sizeof(*(p))) 84 85 void 86 _kvm_freevtop(kd) 87 kvm_t *kd; 88 { 89 if (kd->vmst != 0) 90 free(kd->vmst); 91 } 92 93 int 94 _kvm_initvtop(kd) 95 kvm_t *kd; 96 { 97 struct vmstate *vm; 98 struct nlist nlist[4]; 99 100 vm = (struct vmstate *)_kvm_malloc(kd, sizeof(*vm)); 101 if (vm == 0) 102 return (-1); 103 kd->vmst = vm; 104 105 nlist[0].n_name = "cpu_arch"; 106 nlist[1].n_name = "Sysmap"; 107 nlist[2].n_name = "Sysmapsize"; 108 nlist[3].n_name = 0; 109 110 if (kvm_nlist(kd, nlist) != 0) { 111 _kvm_err(kd, kd->program, "bad namelist"); 112 return (-1); 113 } 114 if (KREAD(kd, (u_long)nlist[0].n_value, &vm->cpu_arch)) { 115 _kvm_err(kd, kd->program, "cannot read cpu_arch"); 116 return (-1); 117 } 118 if (KREAD(kd, (u_long)nlist[1].n_value, &vm->Sysmap)) { 119 _kvm_err(kd, kd->program, "cannot read Sysmap"); 120 return (-1); 121 } 122 if (KREAD(kd, (u_long)nlist[2].n_value, &vm->Sysmapsize)) { 123 _kvm_err(kd, kd->program, "cannot read mmutype"); 124 return (-1); 125 } 126 return (0); 127 } 128 129 /* 130 * Translate a kernel virtual address to a physical address. 131 */ 132 int 133 _kvm_kvatop(kd, va, pa) 134 kvm_t *kd; 135 u_long va; 136 u_long *pa; 137 { 138 register struct vmstate *vm; 139 u_long pte, addr, offset; 140 141 u_int pgshift, pg_v, pg_frame; 142 143 if (ISALIVE(kd)) { 144 _kvm_err(kd, 0, "vatop called in live kernel!"); 145 return((off_t)0); 146 } 147 148 /* Compute TLB offsets for the level of mips cpu we're running on */ 149 vm = kd->vmst; 150 switch (vm->cpu_arch) { 151 case 1: 152 pgshift = MIPS1_PG_SHIFT; 153 pg_v = MIPS1_PG_V; 154 pg_frame = MIPS1_PG_FRAME; 155 break; 156 157 case 3: 158 pgshift = MIPS3_PG_SHIFT; 159 pg_v = MIPS3_PG_V; 160 pg_frame = MIPS3_PG_FRAME; 161 break; 162 163 default: 164 _kvm_err(kd, 0, "unknown or unsupported mips CPU family!"); 165 return((off_t)0); 166 } 167 168 offset = va & PGOFSET; 169 /* 170 * If we are initializing (kernel segment table pointer not yet set) 171 * then return pa == va to avoid infinite recursion. 172 */ 173 if (vm->Sysmap == 0) { 174 *pa = va; 175 return (NBPG - offset); 176 } 177 if (va < KERNBASE || 178 va >= VM_MIN_KERNEL_ADDRESS + vm->Sysmapsize * NBPG) 179 goto invalid; 180 if (va < VM_MIN_KERNEL_ADDRESS) { 181 *pa = MIPS_KSEG0_TO_PHYS(va); 182 return (NBPG - offset); 183 } 184 addr = (u_long)(vm->Sysmap + 185 ((va - VM_MIN_KERNEL_ADDRESS) >> pgshift)); 186 187 /* 188 * Can't use KREAD to read kernel segment table entries. 189 * Fortunately it is 1-to-1 mapped so we don't have to. 190 */ 191 if (lseek(kd->pmfd, (off_t)addr, 0) < 0 || 192 read(kd->pmfd, (char *)&pte, sizeof(pte)) < 0) 193 goto invalid; 194 if (!(pte & pg_v)) 195 goto invalid; 196 *pa = (pte & pg_frame) | offset; 197 return (NBPG - offset); 198 199 invalid: 200 _kvm_err(kd, 0, "invalid address (%x)", va); 201 return (0); 202 } 203 204 /* 205 * Machine-dependent initialization for ALL open kvm descriptors, 206 * not just those for a kernel crash dump. Some architectures 207 * have to deal with these NOT being constants! (i.e. m68k) 208 */ 209 int 210 _kvm_mdopen(kd) 211 kvm_t *kd; 212 { 213 214 kd->usrstack = USRSTACK; 215 kd->min_uva = VM_MIN_ADDRESS; 216 kd->max_uva = VM_MAXUSER_ADDRESS; 217 218 return (0); 219 } 220