diff options
Diffstat (limited to 'usr.sbin/acpi/acpidump/acpi_user.c')
| -rw-r--r-- | usr.sbin/acpi/acpidump/acpi_user.c | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/usr.sbin/acpi/acpidump/acpi_user.c b/usr.sbin/acpi/acpidump/acpi_user.c new file mode 100644 index 0000000..d759ea7 --- /dev/null +++ b/usr.sbin/acpi/acpidump/acpi_user.c @@ -0,0 +1,222 @@ +/*- + * Copyright (c) 1999 Doug Rabson + * Copyright (c) 2000 Mitsuru IWASAKI <iwasaki@FreeBSD.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +#include <sys/param.h> +#include <sys/mman.h> +#include <sys/queue.h> +#include <sys/stat.h> +#include <sys/sysctl.h> + +#include <err.h> +#include <fcntl.h> +#include <kenv.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "acpidump.h" + +static char hint_acpi_0_rsdp[] = "hint.acpi.0.rsdp"; +static char machdep_acpi_root[] = "machdep.acpi_root"; +static int acpi_mem_fd = -1; + +struct acpi_user_mapping { + LIST_ENTRY(acpi_user_mapping) link; + vm_offset_t pa; + caddr_t va; + size_t size; +}; + +static LIST_HEAD(acpi_user_mapping_list, acpi_user_mapping) maplist; + +static void +acpi_user_init(void) +{ + + if (acpi_mem_fd == -1) { + acpi_mem_fd = open("/dev/mem", O_RDONLY); + if (acpi_mem_fd == -1) + err(1, "opening /dev/mem"); + LIST_INIT(&maplist); + } +} + +static struct acpi_user_mapping * +acpi_user_find_mapping(vm_offset_t pa, size_t size) +{ + struct acpi_user_mapping *map; + + /* First search for an existing mapping */ + for (map = LIST_FIRST(&maplist); map; map = LIST_NEXT(map, link)) { + if (map->pa <= pa && map->size >= pa + size - map->pa) + return (map); + } + + /* Then create a new one */ + size = round_page(pa + size) - trunc_page(pa); + pa = trunc_page(pa); + map = malloc(sizeof(struct acpi_user_mapping)); + if (!map) + errx(1, "out of memory"); + map->pa = pa; + map->va = mmap(0, size, PROT_READ, MAP_SHARED, acpi_mem_fd, pa); + map->size = size; + if ((intptr_t) map->va == -1) + err(1, "can't map address"); + LIST_INSERT_HEAD(&maplist, map, link); + + return (map); +} + +static ACPI_TABLE_RSDP * +acpi_get_rsdp(u_long addr) +{ + ACPI_TABLE_RSDP rsdp; + size_t len; + + /* Read in the table signature and check it. */ + pread(acpi_mem_fd, &rsdp, 8, addr); + if (memcmp(rsdp.Signature, "RSD PTR ", 8)) + return (NULL); + + /* Read the entire table. */ + pread(acpi_mem_fd, &rsdp, sizeof(rsdp), addr); + + /* Check the standard checksum. */ + if (acpi_checksum(&rsdp, ACPI_RSDP_CHECKSUM_LENGTH) != 0) + return (NULL); + + /* Check extended checksum if table version >= 2. */ + if (rsdp.Revision >= 2 && + acpi_checksum(&rsdp, ACPI_RSDP_XCHECKSUM_LENGTH) != 0) + return (NULL); + + /* If the revision is 0, assume a version 1 length. */ + if (rsdp.Revision == 0) + len = sizeof(ACPI_RSDP_COMMON); + else + len = rsdp.Length; + + return (acpi_map_physical(addr, len)); +} + +static ACPI_TABLE_RSDP * +acpi_scan_rsd_ptr(void) +{ +#if defined(__amd64__) || defined(__i386__) + ACPI_TABLE_RSDP *rsdp; + u_long addr, end; + + /* + * On ia32, scan physical memory for the RSD PTR if above failed. + * According to section 5.2.2 of the ACPI spec, we only consider + * two regions for the base address: + * 1. EBDA (1 KB area addressed by the 16 bit pointer at 0x40E + * 2. High memory (0xE0000 - 0xFFFFF) + */ + addr = ACPI_EBDA_PTR_LOCATION; + pread(acpi_mem_fd, &addr, sizeof(uint16_t), addr); + addr <<= 4; + end = addr + ACPI_EBDA_WINDOW_SIZE; + for (; addr < end; addr += 16) + if ((rsdp = acpi_get_rsdp(addr)) != NULL) + return (rsdp); + addr = ACPI_HI_RSDP_WINDOW_BASE; + end = addr + ACPI_HI_RSDP_WINDOW_SIZE; + for (; addr < end; addr += 16) + if ((rsdp = acpi_get_rsdp(addr)) != NULL) + return (rsdp); +#endif /* __amd64__ || __i386__ */ + return (NULL); +} + +/* + * Public interfaces + */ +ACPI_TABLE_RSDP * +acpi_find_rsd_ptr(void) +{ + ACPI_TABLE_RSDP *rsdp; + char buf[20]; + u_long addr; + size_t len; + + acpi_user_init(); + + addr = 0; + + /* Attempt to use kenv or sysctl to find RSD PTR record. */ + if (kenv(KENV_GET, hint_acpi_0_rsdp, buf, 20) > 0) + addr = strtoul(buf, NULL, 0); + if (addr == 0) { + len = sizeof(addr); + if (sysctlbyname(machdep_acpi_root, &addr, &len, NULL, 0) != 0) + addr = 0; + } + if (addr != 0 && (rsdp = acpi_get_rsdp(addr)) != NULL) + return (rsdp); + + return (acpi_scan_rsd_ptr()); +} + +void * +acpi_map_physical(vm_offset_t pa, size_t size) +{ + struct acpi_user_mapping *map; + + map = acpi_user_find_mapping(pa, size); + return (map->va + (pa - map->pa)); +} + +ACPI_TABLE_HEADER * +dsdt_load_file(char *infile) +{ + ACPI_TABLE_HEADER *sdt; + uint8_t *dp; + struct stat sb; + + if ((acpi_mem_fd = open(infile, O_RDONLY)) == -1) + errx(1, "opening %s", infile); + + LIST_INIT(&maplist); + + if (fstat(acpi_mem_fd, &sb) == -1) + errx(1, "fstat %s", infile); + + dp = mmap(0, sb.st_size, PROT_READ, MAP_PRIVATE, acpi_mem_fd, 0); + if (dp == NULL) + errx(1, "mmap %s", infile); + + sdt = (ACPI_TABLE_HEADER *)dp; + if (strncmp(dp, ACPI_SIG_DSDT, 4) != 0 || + acpi_checksum(sdt, sdt->Length) != 0) + return (NULL); + + return (sdt); +} |
