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 * $FreeBSD$ 28 */ 29 30 #include <sys/param.h> 31 #include <sys/mman.h> 32 #include <sys/queue.h> 33 #include <sys/stat.h> 34 #include <sys/sysctl.h> 35 36 #include <err.h> 37 #include <fcntl.h> 38 #include <kenv.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <unistd.h> 42 43 #include "acpidump.h" 44 45 static char hint_acpi_0_rsdp[] = "hint.acpi.0.rsdp"; 46 static char machdep_acpi_root[] = "machdep.acpi_root"; 47 static int acpi_mem_fd = -1; 48 49 struct acpi_user_mapping { 50 LIST_ENTRY(acpi_user_mapping) link; 51 vm_offset_t pa; 52 caddr_t va; 53 size_t size; 54 }; 55 56 LIST_HEAD(acpi_user_mapping_list, acpi_user_mapping) maplist; 57 58 static void 59 acpi_user_init(void) 60 { 61 62 if (acpi_mem_fd == -1) { 63 acpi_mem_fd = open("/dev/mem", O_RDONLY); 64 if (acpi_mem_fd == -1) 65 err(1, "opening /dev/mem"); 66 LIST_INIT(&maplist); 67 } 68 } 69 70 static struct acpi_user_mapping * 71 acpi_user_find_mapping(vm_offset_t pa, size_t size) 72 { 73 struct acpi_user_mapping *map; 74 75 /* First search for an existing mapping */ 76 for (map = LIST_FIRST(&maplist); map; map = LIST_NEXT(map, link)) { 77 if (map->pa <= pa && map->size >= pa + size - map->pa) 78 return (map); 79 } 80 81 /* Then create a new one */ 82 size = round_page(pa + size) - trunc_page(pa); 83 pa = trunc_page(pa); 84 map = malloc(sizeof(struct acpi_user_mapping)); 85 if (!map) 86 errx(1, "out of memory"); 87 map->pa = pa; 88 map->va = mmap(0, size, PROT_READ, MAP_SHARED, acpi_mem_fd, pa); 89 map->size = size; 90 if ((intptr_t) map->va == -1) 91 err(1, "can't map address"); 92 LIST_INSERT_HEAD(&maplist, map, link); 93 94 return (map); 95 } 96 97 static struct ACPIrsdp * 98 acpi_get_rsdp(u_long addr) 99 { 100 struct ACPIrsdp rsdp; 101 size_t len; 102 103 /* Read in the table signature and check it. */ 104 pread(acpi_mem_fd, &rsdp, 8, addr); 105 if (memcmp(rsdp.signature, "RSD PTR ", 8)) 106 return (NULL); 107 108 /* Read the entire table. */ 109 pread(acpi_mem_fd, &rsdp, sizeof(rsdp), addr); 110 111 /* Run the checksum only over the version 1 header. */ 112 if (acpi_checksum(&rsdp, 20)) 113 return (NULL); 114 115 /* If the revision is 0, assume a version 1 length. */ 116 if (rsdp.revision == 0) 117 len = 20; 118 else 119 len = rsdp.length; 120 121 /* XXX Should handle ACPI 2.0 RSDP extended checksum here. */ 122 123 return (acpi_map_physical(addr, len)); 124 } 125 126 static struct ACPIrsdp * 127 acpi_scan_rsd_ptr(void) 128 { 129 #if defined(__amd64__) || defined(__i386__) 130 struct ACPIrsdp *rsdp; 131 u_long addr, end; 132 133 /* 134 * On ia32, scan physical memory for the RSD PTR if above failed. 135 * According to section 5.2.2 of the ACPI spec, we only consider 136 * two regions for the base address: 137 * 1. EBDA (1 KB area addressed by the 16 bit pointer at 0x40E 138 * 2. High memory (0xE0000 - 0xFFFFF) 139 */ 140 addr = RSDP_EBDA_PTR; 141 pread(acpi_mem_fd, &addr, sizeof(uint16_t), addr); 142 addr <<= 4; 143 end = addr + RSDP_EBDA_SIZE; 144 for (; addr < end; addr += 16) 145 if ((rsdp = acpi_get_rsdp(addr)) != NULL) 146 return (rsdp); 147 addr = RSDP_HI_START; 148 end = addr + RSDP_HI_SIZE; 149 for (; addr < end; addr += 16) 150 if ((rsdp = acpi_get_rsdp(addr)) != NULL) 151 return (rsdp); 152 #endif /* __amd64__ || __i386__ */ 153 return (NULL); 154 } 155 156 /* 157 * Public interfaces 158 */ 159 struct ACPIrsdp * 160 acpi_find_rsd_ptr(void) 161 { 162 struct ACPIrsdp *rsdp; 163 char buf[20]; 164 u_long addr; 165 size_t len; 166 167 acpi_user_init(); 168 169 addr = 0; 170 171 /* Attempt to use kenv or sysctl to find RSD PTR record. */ 172 if (kenv(KENV_GET, hint_acpi_0_rsdp, buf, 20) == 0) 173 addr = strtoul(buf, NULL, 0); 174 if (addr == 0) { 175 len = sizeof(addr); 176 if (sysctlbyname(machdep_acpi_root, &addr, &len, NULL, 0) != 0) 177 addr = 0; 178 } 179 if (addr != 0 && (rsdp = acpi_get_rsdp(addr)) != NULL) 180 return (rsdp); 181 182 return (acpi_scan_rsd_ptr()); 183 } 184 185 void * 186 acpi_map_physical(vm_offset_t pa, size_t size) 187 { 188 struct acpi_user_mapping *map; 189 190 map = acpi_user_find_mapping(pa, size); 191 return (map->va + (pa - map->pa)); 192 } 193 194 struct ACPIsdt * 195 dsdt_load_file(char *infile) 196 { 197 struct ACPIsdt *sdt; 198 uint8_t *dp; 199 struct stat sb; 200 201 if ((acpi_mem_fd = open(infile, O_RDONLY)) == -1) 202 errx(1, "opening %s", infile); 203 204 LIST_INIT(&maplist); 205 206 if (fstat(acpi_mem_fd, &sb) == -1) 207 errx(1, "fstat %s", infile); 208 209 dp = mmap(0, sb.st_size, PROT_READ, MAP_PRIVATE, acpi_mem_fd, 0); 210 if (dp == NULL) 211 errx(1, "mmap %s", infile); 212 213 sdt = (struct ACPIsdt *)dp; 214 if (strncmp(dp, "DSDT", 4) != 0 || acpi_checksum(sdt, sdt->len) != 0) 215 return (NULL); 216 217 return (sdt); 218 } 219