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/*-
* 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;
};
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);
}
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