1 /* $NetBSD: kvm_mips.c,v 1.5 1997/06/25 21:08:45 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 #if defined(LIBC_SCCS) && !defined(lint) 41 #if 0 42 static char sccsid[] = "@(#)kvm_mips.c 8.1 (Berkeley) 6/4/93"; 43 #else 44 static char *rcsid = "$NetBSD: kvm_mips.c,v 1.5 1997/06/25 21:08:45 jonathan Exp $"; 45 #endif 46 #endif /* LIBC_SCCS and not lint */ 47 48 /* 49 * MIPS machine dependent routines for kvm. Hopefully, the forthcoming 50 * vm code will one day obsolete this module. 51 */ 52 53 #include <sys/param.h> 54 #include <sys/user.h> 55 #include <sys/proc.h> 56 #include <sys/stat.h> 57 #include <unistd.h> 58 #include <nlist.h> 59 #include <kvm.h> 60 61 #include <vm/vm.h> 62 #include <vm/vm_param.h> 63 64 #include <limits.h> 65 #include <db.h> 66 67 #include "kvm_private.h" 68 69 #include <mips/cpuregs.h> 70 #include <mips/mips1_pte.h> 71 #include <mips/mips3_pte.h> 72 #include <mips/pmap.h> 73 74 struct vmstate { 75 /*pt_entry_t*/u_int *Sysmap; 76 u_int Sysmapsize; 77 u_int cpu_arch; 78 }; 79 80 #define KREAD(kd, addr, p)\ 81 (kvm_read(kd, addr, (char *)(p), sizeof(*(p))) != sizeof(*(p))) 82 83 void 84 _kvm_freevtop(kd) 85 kvm_t *kd; 86 { 87 if (kd->vmst != 0) 88 free(kd->vmst); 89 } 90 91 int 92 _kvm_initvtop(kd) 93 kvm_t *kd; 94 { 95 struct vmstate *vm; 96 struct nlist nlist[4]; 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 = "cpu_arch"; 104 nlist[1].n_name = "Sysmap"; 105 nlist[2].n_name = "Sysmapsize"; 106 nlist[3].n_name = 0; 107 108 if (kvm_nlist(kd, nlist) != 0) { 109 _kvm_err(kd, kd->program, "bad namelist"); 110 return (-1); 111 } 112 if (KREAD(kd, (u_long)nlist[0].n_value, &vm->cpu_arch)) { 113 _kvm_err(kd, kd->program, "cannot read cpu_arch"); 114 return (-1); 115 } 116 if (KREAD(kd, (u_long)nlist[1].n_value, &vm->Sysmap)) { 117 _kvm_err(kd, kd->program, "cannot read Sysmap"); 118 return (-1); 119 } 120 if (KREAD(kd, (u_long)nlist[2].n_value, &vm->Sysmapsize)) { 121 _kvm_err(kd, kd->program, "cannot read mmutype"); 122 return (-1); 123 } 124 return (0); 125 } 126 127 /* 128 * Translate a kernel virtual address to a physical address. 129 */ 130 int 131 _kvm_kvatop(kd, va, pa) 132 kvm_t *kd; 133 u_long va; 134 u_long *pa; 135 { 136 register struct vmstate *vm; 137 u_long pte, addr, offset; 138 139 u_int pgshift, pg_v, pg_frame; 140 141 if (ISALIVE(kd)) { 142 _kvm_err(kd, 0, "vatop called in live kernel!"); 143 return((off_t)0); 144 } 145 146 /* Compute TLB offsets for the level of mips cpu we're running on */ 147 switch (vm->cpu_arch) { 148 case 1: 149 pgshift = MIPS1_PG_SHIFT; 150 pg_v = MIPS1_PG_V; 151 pg_frame = MIPS1_PG_FRAME; 152 break; 153 154 case 3: 155 pgshift = MIPS3_PG_SHIFT; 156 pg_v = MIPS3_PG_V; 157 pg_frame = MIPS3_PG_FRAME; 158 break; 159 160 default: 161 _kvm_err(kd, 0, "unknown or unsupported mips CPU family!"); 162 return((off_t)0); 163 } 164 165 vm = kd->vmst; 166 offset = va & PGOFSET; 167 /* 168 * If we are initializing (kernel segment table pointer not yet set) 169 * then return pa == va to avoid infinite recursion. 170 */ 171 if (vm->Sysmap == 0) { 172 *pa = va; 173 return (NBPG - offset); 174 } 175 if (va < KERNBASE || 176 va >= VM_MIN_KERNEL_ADDRESS + vm->Sysmapsize * NBPG) 177 goto invalid; 178 if (va < VM_MIN_KERNEL_ADDRESS) { 179 *pa = MIPS_KSEG0_TO_PHYS(va); 180 return (NBPG - offset); 181 } 182 addr = (u_long)(vm->Sysmap + 183 ((va - VM_MIN_KERNEL_ADDRESS) >> pgshift)); 184 185 /* 186 * Can't use KREAD to read kernel segment table entries. 187 * Fortunately it is 1-to-1 mapped so we don't have to. 188 */ 189 if (lseek(kd->pmfd, (off_t)addr, 0) < 0 || 190 read(kd->pmfd, (char *)&pte, sizeof(pte)) < 0) 191 goto invalid; 192 if (!(pte & pg_v)) 193 goto invalid; 194 *pa = (pte & pg_frame) | offset; 195 return (NBPG - offset); 196 197 invalid: 198 _kvm_err(kd, 0, "invalid address (%x)", va); 199 return (0); 200 } 201