1 /*- 2 * Copyright (c) 1999 Doug Rabson 3 * Copyright (c) 2000 Mitsuru IWASAKI <iwasaki@FreeBSD.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 * 27 * $Id: acpi_user.c,v 1.5 2000/08/09 14:47:52 iwasaki Exp $ 28 * $FreeBSD$ 29 */ 30 31 #include <sys/param.h> 32 #include <sys/mman.h> 33 #include <sys/queue.h> 34 #include <sys/stat.h> 35 36 #include <err.h> 37 #include <fcntl.h> 38 #include <stdlib.h> 39 #include <string.h> 40 #include <unistd.h> 41 42 #include "acpidump.h" 43 44 static int acpi_mem_fd = -1; 45 46 struct acpi_user_mapping { 47 LIST_ENTRY(acpi_user_mapping) link; 48 vm_offset_t pa; 49 caddr_t va; 50 size_t size; 51 }; 52 53 LIST_HEAD(acpi_user_mapping_list, acpi_user_mapping) maplist; 54 55 static void 56 acpi_user_init() 57 { 58 59 if (acpi_mem_fd == -1) { 60 acpi_mem_fd = open("/dev/mem", O_RDONLY); 61 if (acpi_mem_fd == -1) 62 err(1, "opening /dev/mem"); 63 LIST_INIT(&maplist); 64 } 65 } 66 67 static struct acpi_user_mapping * 68 acpi_user_find_mapping(vm_offset_t pa, size_t size) 69 { 70 struct acpi_user_mapping *map; 71 72 /* First search for an existing mapping */ 73 for (map = LIST_FIRST(&maplist); map; map = LIST_NEXT(map, link)) { 74 if (map->pa <= pa && map->size >= pa + size - map->pa) 75 return (map); 76 } 77 78 /* Then create a new one */ 79 size = round_page(pa + size) - trunc_page(pa); 80 pa = trunc_page(pa); 81 map = malloc(sizeof(struct acpi_user_mapping)); 82 if (!map) 83 errx(1, "out of memory"); 84 map->pa = pa; 85 map->va = mmap(0, size, PROT_READ, MAP_SHARED, acpi_mem_fd, pa); 86 map->size = size; 87 if ((intptr_t) map->va == -1) 88 err(1, "can't map address"); 89 LIST_INSERT_HEAD(&maplist, map, link); 90 91 return (map); 92 } 93 94 /* 95 * Public interfaces 96 */ 97 98 struct ACPIrsdp * 99 acpi_find_rsd_ptr() 100 { 101 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 } 120 121 void * 122 acpi_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 } 129 130 void 131 acpi_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