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/* $OpenBSD: acpi_user.c,v 1.2 2005/07/21 16:38:55 fgsch Exp $ */
/*-
* 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.
*
* $Id: acpi_user.c,v 1.2 2005/07/21 16:38:55 fgsch Exp $
* $FreeBSD: src/usr.sbin/acpi/acpidump/acpi_user.c,v 1.3 2000/11/08 02:37:00 iwasaki Exp $
*/
#ifdef __FreeBSD__
#include <sys/param.h>
#else
#include <sys/types.h>
#define PAGE_MASK (0x1000-1) /*For I386*/
#define trunc_page(x) ((x) & ~PAGE_MASK)
#define round_page(x) (((x) + PAGE_MASK) & ~PAGE_MASK)
#endif
#include <sys/mman.h>
#include <sys/queue.h>
#include <sys/stat.h>
#include <err.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "acpidump.h"
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()
{
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 ((long) map->va == -1)
err(1, "can't map address");
LIST_INSERT_HEAD(&maplist, map, link);
return (map);
}
/*
* Public interfaces
*/
struct ACPIrsdp *
acpi_find_rsd_ptr()
{
int i;
u_int8_t buf[sizeof(struct ACPIrsdp)];
acpi_user_init();
for (i = 0; i < 1024 * 1024; i += 16) {
read(acpi_mem_fd, buf, 16);
if (!memcmp(buf, "RSD PTR ", 8)) {
/* Read the rest of the structure */
read(acpi_mem_fd, buf + 16, sizeof(struct ACPIrsdp) - 16);
/* Verify checksum before accepting it. */
if (acpi_checksum(buf, sizeof(struct ACPIrsdp)))
continue;
return (acpi_map_physical(i, sizeof(struct ACPIrsdp)));
}
}
return (0);
}
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));
}
void
acpi_load_dsdt(char *dumpfile, u_int8_t **dpp, u_int8_t **endp)
{
u_int8_t *dp;
u_int8_t *end;
struct stat sb;
if ((acpi_mem_fd = open(dumpfile, O_RDONLY)) == -1) {
errx(1, "opening %s", dumpfile);
}
LIST_INIT(&maplist);
if (fstat(acpi_mem_fd, &sb) == -1) {
errx(1, "fstat %s", dumpfile);
}
dp = mmap(0, sb.st_size, PROT_READ, MAP_PRIVATE, acpi_mem_fd, 0);
if (dp == NULL) {
errx(1, "mmap %s", dumpfile);
}
if (strncmp(dp, "DSDT", 4) == 0) {
memcpy(&dsdt_header, dp, SIZEOF_SDT_HDR);
dp += SIZEOF_SDT_HDR;
sb.st_size -= SIZEOF_SDT_HDR;
}
end = (u_int8_t *) dp + sb.st_size;
*dpp = dp;
*endp = end;
}
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