2 * Copyright (c) 1999 Doug Rabson
3 * Copyright (c) 2000 Mitsuru IWASAKI <iwasaki@FreeBSD.org>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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
30 #include <sys/param.h>
32 #include <sys/queue.h>
34 #include <sys/sysctl.h>
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;
49 struct acpi_user_mapping {
50 LIST_ENTRY(acpi_user_mapping) link;
56 LIST_HEAD(acpi_user_mapping_list, acpi_user_mapping) maplist;
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");
70 static struct acpi_user_mapping *
71 acpi_user_find_mapping(vm_offset_t pa, size_t size)
73 struct acpi_user_mapping *map;
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)
81 /* Then create a new one */
82 size = round_page(pa + size) - trunc_page(pa);
84 map = malloc(sizeof(struct acpi_user_mapping));
86 errx(1, "out of memory");
88 map->va = mmap(0, size, PROT_READ, MAP_SHARED, acpi_mem_fd, pa);
90 if ((intptr_t) map->va == -1)
91 err(1, "can't map address");
92 LIST_INSERT_HEAD(&maplist, map, link);
97 static struct ACPIrsdp *
98 acpi_get_rsdp(u_long addr)
100 struct ACPIrsdp rsdp;
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))
108 /* Read the entire table. */
109 pread(acpi_mem_fd, &rsdp, sizeof(rsdp), addr);
111 /* Run the checksum only over the version 1 header. */
112 if (acpi_checksum(&rsdp, 20))
115 /* If the revision is 0, assume a version 1 length. */
116 if (rsdp.revision == 0)
121 /* XXX Should handle ACPI 2.0 RSDP extended checksum here. */
123 return (acpi_map_physical(addr, len));
126 static struct ACPIrsdp *
127 acpi_scan_rsd_ptr(void)
129 #if defined(__amd64__) || defined(__i386__)
130 struct ACPIrsdp *rsdp;
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)
140 addr = RSDP_EBDA_PTR;
141 pread(acpi_mem_fd, &addr, sizeof(uint16_t), addr);
143 end = addr + RSDP_EBDA_SIZE;
144 for (; addr < end; addr += 16)
145 if ((rsdp = acpi_get_rsdp(addr)) != NULL)
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)
152 #endif /* __amd64__ || __i386__ */
160 acpi_find_rsd_ptr(void)
162 struct ACPIrsdp *rsdp;
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);
176 if (sysctlbyname(machdep_acpi_root, &addr, &len, NULL, 0) != 0)
179 if (addr != 0 && (rsdp = acpi_get_rsdp(addr)) != NULL)
182 return (acpi_scan_rsd_ptr());
186 acpi_map_physical(vm_offset_t pa, size_t size)
188 struct acpi_user_mapping *map;
190 map = acpi_user_find_mapping(pa, size);
191 return (map->va + (pa - map->pa));
195 dsdt_load_file(char *infile)
201 if ((acpi_mem_fd = open(infile, O_RDONLY)) == -1)
202 errx(1, "opening %s", infile);
206 if (fstat(acpi_mem_fd, &sb) == -1)
207 errx(1, "fstat %s", infile);
209 dp = mmap(0, sb.st_size, PROT_READ, MAP_PRIVATE, acpi_mem_fd, 0);
211 errx(1, "mmap %s", infile);
213 sdt = (struct ACPIsdt *)dp;
214 if (strncmp(dp, "DSDT", 4) != 0 || acpi_checksum(sdt, sdt->len) != 0)