usr.sbin/acpi/acpidump/acpi_user.c

   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: src/usr.sbin/acpi/acpidump/acpi_user.c,v 1.12 2004/05/28 07:25:23 njl Exp $
  28  *      $DragonFly: src/usr.sbin/acpi/acpidump/acpi_user.c,v 1.1 2004/07/05 00:22:43 dillon Exp $
  29  */
  30
  31 #include <sys/param.h>
  32 #include <sys/mman.h>
  33 #include <sys/queue.h>
  34 #include <sys/stat.h>
  35 #include <sys/sysctl.h>
  36
  37 #include <err.h>
  38 #include <fcntl.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <unistd.h>
  42
  43 #include "acpidump.h"
  44
  45 static char     machdep_acpi_root[] = "machdep.acpi_root";
  46 static int      acpi_mem_fd = -1;
  47
  48 struct acpi_user_mapping {
  49         LIST_ENTRY(acpi_user_mapping) link;
  50         vm_offset_t     pa;
  51         caddr_t         va;
  52         size_t          size;
  53 };
  54
  55 LIST_HEAD(acpi_user_mapping_list, acpi_user_mapping) maplist;
  56
  57 static void
  58 acpi_user_init(void)
  59 {
  60
  61         if (acpi_mem_fd == -1) {
  62                 acpi_mem_fd = open("/dev/mem", O_RDONLY);
  63                 if (acpi_mem_fd == -1)
  64                         err(1, "opening /dev/mem");
  65                 LIST_INIT(&maplist);
  66         }
  67 }
  68
  69 static struct acpi_user_mapping *
  70 acpi_user_find_mapping(vm_offset_t pa, size_t size)
  71 {
  72         struct  acpi_user_mapping *map;
  73
  74         /* First search for an existing mapping */
  75         for (map = LIST_FIRST(&maplist); map; map = LIST_NEXT(map, link)) {
  76                 if (map->pa <= pa && map->size >= pa + size - map->pa)
  77                         return (map);
  78         }
  79
  80         /* Then create a new one */
  81         size = round_page(pa + size) - trunc_page(pa);
  82         pa = trunc_page(pa);
  83         map = malloc(sizeof(struct acpi_user_mapping));
  84         if (!map)
  85                 errx(1, "out of memory");
  86         map->pa = pa;
  87         map->va = mmap(0, size, PROT_READ, MAP_SHARED, acpi_mem_fd, pa);
  88         map->size = size;
  89         if ((intptr_t) map->va == -1)
  90                 err(1, "can't map address");
  91         LIST_INSERT_HEAD(&maplist, map, link);
  92
  93         return (map);
  94 }
  95
  96 static struct ACPIrsdp *
  97 acpi_get_rsdp(u_long addr)
  98 {
  99         struct ACPIrsdp rsdp;
 100         size_t len;
 101
 102         /* Read in the table signature and check it. */
 103         pread(acpi_mem_fd, &rsdp, 8, addr);
 104         if (memcmp(rsdp.signature, "RSD PTR ", 8))
 105                 return (NULL);
 106
 107         /* Read the entire table. */
 108         pread(acpi_mem_fd, &rsdp, sizeof(rsdp), addr);
 109
 110         /* Run the checksum only over the version 1 header. */
 111         if (acpi_checksum(&rsdp, 20))
 112                 return (NULL);
 113
 114         /* If the revision is 0, assume a version 1 length. */
 115         if (rsdp.revision == 0)
 116                 len = 20;
 117         else
 118                 len = rsdp.length;
 119
 120         /* XXX Should handle ACPI 2.0 RSDP extended checksum here. */
 121
 122         return (acpi_map_physical(addr, len));
 123 }
 124
 125 static struct ACPIrsdp *
 126 acpi_scan_rsd_ptr(void)
 127 {
 128 #if defined(__i386__)
 129         struct ACPIrsdp *rsdp;
 130         u_long          addr, end;
 131
 132         /*
 133          * On ia32, scan physical memory for the RSD PTR if above failed.
 134          * According to section 5.2.2 of the ACPI spec, we only consider
 135          * two regions for the base address:
 136          * 1. EBDA (1 KB area addressed by the 16 bit pointer at 0x40E
 137          * 2. High memory (0xE0000 - 0xFFFFF)
 138          */
 139         addr = RSDP_EBDA_PTR;
 140         pread(acpi_mem_fd, &addr, sizeof(uint16_t), addr);
 141         addr <<= 4;
 142         end = addr + RSDP_EBDA_SIZE;
 143         for (; addr < end; addr += 16)
 144                 if ((rsdp = acpi_get_rsdp(addr)) != NULL)
 145                         return (rsdp);
 146         addr = RSDP_HI_START;
 147         end = addr + RSDP_HI_SIZE;
 148         for (; addr < end; addr += 16)
 149                 if ((rsdp = acpi_get_rsdp(addr)) != NULL)
 150                         return (rsdp);
 151 #endif /* __i386__ */
 152         return (NULL);
 153 }
 154
 155 /*
 156  * Public interfaces
 157  */
 158 struct ACPIrsdp *
 159 acpi_find_rsd_ptr(void)
 160 {
 161         struct ACPIrsdp *rsdp;
 162         u_long          addr;
 163         size_t          len;
 164
 165         acpi_user_init();
 166
 167         /* Attempt to use sysctl to find RSD PTR record. */
 168         len = sizeof(addr);
 169         if (sysctlbyname(machdep_acpi_root, &addr, &len, NULL, 0) == 0) {
 170                 if ((rsdp = acpi_get_rsdp(addr)) != NULL)
 171                         return (rsdp);
 172                 else
 173                         warnx("sysctl %s does not point to RSDP",
 174                             machdep_acpi_root);
 175         }
 176
 177         return (acpi_scan_rsd_ptr());
 178 }
 179
 180 void *
 181 acpi_map_physical(vm_offset_t pa, size_t size)
 182 {
 183         struct  acpi_user_mapping *map;
 184
 185         map = acpi_user_find_mapping(pa, size);
 186         return (map->va + (pa - map->pa));
 187 }
 188
 189 struct ACPIsdt *
 190 dsdt_load_file(char *infile)
 191 {
 192         struct ACPIsdt  *sdt;
 193         uint8_t         *dp;
 194         struct stat      sb;
 195
 196         if ((acpi_mem_fd = open(infile, O_RDONLY)) == -1)
 197                 errx(1, "opening %s", infile);
 198
 199         LIST_INIT(&maplist);
 200
 201         if (fstat(acpi_mem_fd, &sb) == -1)
 202                 errx(1, "fstat %s", infile);
 203
 204         dp = mmap(0, sb.st_size, PROT_READ, MAP_PRIVATE, acpi_mem_fd, 0);
 205         if (dp == NULL)
 206                 errx(1, "mmap %s", infile);
 207
 208         sdt = (struct ACPIsdt *)dp;
 209         if (strncmp(dp, "DSDT", 4) != 0 || acpi_checksum(sdt, sdt->len) != 0)
 210                 return (NULL);
 211
 212         return (sdt);
 213 }