acpi_user.c revision 68475
1186284Sbms/*- 2186284Sbms * Copyright (c) 1999 Doug Rabson 3186284Sbms * Copyright (c) 2000 Mitsuru IWASAKI <iwasaki@FreeBSD.org> 4186284Sbms * All rights reserved. 5186284Sbms * 6186284Sbms * Redistribution and use in source and binary forms, with or without 7186284Sbms * modification, are permitted provided that the following conditions 8186284Sbms * are met: 9186284Sbms * 1. Redistributions of source code must retain the above copyright 10186284Sbms * notice, this list of conditions and the following disclaimer. 11186284Sbms * 2. Redistributions in binary form must reproduce the above copyright 12186284Sbms * notice, this list of conditions and the following disclaimer in the 13186284Sbms * documentation and/or other materials provided with the distribution. 14186284Sbms * 15186284Sbms * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16186284Sbms * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17186284Sbms * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18186284Sbms * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19186284Sbms * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20186284Sbms * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21186284Sbms * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22186284Sbms * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23186284Sbms * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24186284Sbms * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25186284Sbms * SUCH DAMAGE. 26186284Sbms * 27186284Sbms * $Id: acpi_user.c,v 1.5 2000/08/09 14:47:52 iwasaki Exp $ 28186284Sbms * $FreeBSD: head/usr.sbin/acpi/acpidump/acpi_user.c 68475 2000-11-08 02:37:00Z iwasaki $ 29186284Sbms */ 30186284Sbms 31186284Sbms#include <sys/param.h> 32186284Sbms#include <sys/mman.h> 33186284Sbms#include <sys/queue.h> 34186284Sbms#include <sys/stat.h> 35186284Sbms 36186284Sbms#include <err.h> 37186284Sbms#include <fcntl.h> 38186284Sbms#include <stdlib.h> 39186284Sbms#include <string.h> 40186284Sbms#include <unistd.h> 41186284Sbms 42186284Sbms#include "acpidump.h" 43186284Sbms 44186284Sbmsstatic int acpi_mem_fd = -1; 45186284Sbms 46186284Sbmsstruct acpi_user_mapping { 47186284Sbms LIST_ENTRY(acpi_user_mapping) link; 48186284Sbms vm_offset_t pa; 49186284Sbms caddr_t va; 50186284Sbms size_t size; 51186284Sbms}; 52186284Sbms 53186284SbmsLIST_HEAD(acpi_user_mapping_list, acpi_user_mapping) maplist; 54186284Sbms 55186284Sbmsstatic void 56186284Sbmsacpi_user_init() 57186284Sbms{ 58186284Sbms 59186284Sbms if (acpi_mem_fd == -1) { 60186284Sbms acpi_mem_fd = open("/dev/mem", O_RDONLY); 61186284Sbms if (acpi_mem_fd == -1) 62186284Sbms err(1, "opening /dev/mem"); 63186284Sbms LIST_INIT(&maplist); 64186284Sbms } 65186284Sbms} 66186284Sbms 67186284Sbmsstatic struct acpi_user_mapping * 68186284Sbmsacpi_user_find_mapping(vm_offset_t pa, size_t size) 69186284Sbms{ 70186284Sbms struct acpi_user_mapping *map; 71186284Sbms 72186284Sbms /* First search for an existing mapping */ 73186284Sbms for (map = LIST_FIRST(&maplist); map; map = LIST_NEXT(map, link)) { 74186284Sbms if (map->pa <= pa && map->size >= pa + size - map->pa) 75186284Sbms return (map); 76186284Sbms } 77186284Sbms 78186284Sbms /* Then create a new one */ 79186284Sbms size = round_page(pa + size) - trunc_page(pa); 80186284Sbms pa = trunc_page(pa); 81186284Sbms map = malloc(sizeof(struct acpi_user_mapping)); 82186284Sbms if (!map) 83186284Sbms errx(1, "out of memory"); 84186284Sbms map->pa = pa; 85186284Sbms map->va = mmap(0, size, PROT_READ, MAP_SHARED, acpi_mem_fd, pa); 86186284Sbms map->size = size; 87186284Sbms if ((intptr_t) map->va == -1) 88186284Sbms err(1, "can't map address"); 89186284Sbms LIST_INSERT_HEAD(&maplist, map, link); 90186284Sbms 91186284Sbms return (map); 92186284Sbms} 93186284Sbms 94186284Sbms/* 95186284Sbms * Public interfaces 96186284Sbms */ 97186284Sbms 98186284Sbmsstruct ACPIrsdp * 99186284Sbmsacpi_find_rsd_ptr() 100186284Sbms{ 101186284Sbms int i; 102 u_int8_t buf[sizeof(struct ACPIrsdp)]; 103 104 acpi_user_init(); 105 for (i = 0; i < 1024 * 1024; i += 16) { 106 read(acpi_mem_fd, buf, 16); 107 if (!memcmp(buf, "RSD PTR ", 8)) { 108 /* Read the rest of the structure */ 109 read(acpi_mem_fd, buf + 16, sizeof(struct ACPIrsdp) - 16); 110 111 /* Verify checksum before accepting it. */ 112 if (acpi_checksum(buf, sizeof(struct ACPIrsdp))) 113 continue; 114 return (acpi_map_physical(i, sizeof(struct ACPIrsdp))); 115 } 116 } 117 118 return (0); 119} 120 121void * 122acpi_map_physical(vm_offset_t pa, size_t size) 123{ 124 struct acpi_user_mapping *map; 125 126 map = acpi_user_find_mapping(pa, size); 127 return (map->va + (pa - map->pa)); 128} 129 130void 131acpi_load_dsdt(char *dumpfile, u_int8_t **dpp, u_int8_t **endp) 132{ 133 u_int8_t *dp; 134 u_int8_t *end; 135 struct stat sb; 136 137 if ((acpi_mem_fd = open(dumpfile, O_RDONLY)) == -1) { 138 errx(1, "opening %s\n", dumpfile); 139 } 140 141 LIST_INIT(&maplist); 142 143 if (fstat(acpi_mem_fd, &sb) == -1) { 144 errx(1, "fstat %s\n", dumpfile); 145 } 146 147 dp = mmap(0, sb.st_size, PROT_READ, MAP_PRIVATE, acpi_mem_fd, 0); 148 if (dp == NULL) { 149 errx(1, "mmap %s\n", dumpfile); 150 } 151 152 /* 153 * Microsoft asl.exe generates 0x23 byte additional info. 154 * at the begining of the file, so just ignore it. 155 */ 156 if (strncmp(dp, "DSDT", 4) == 0) { 157 dp += 0x23; 158 sb.st_size -= 0x23; 159 } 160 161 end = (u_int8_t *) dp + sb.st_size; 162 *dpp = dp; 163 *endp = end; 164} 165