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/*-
* Copyright (c) 2001 Michael Smith <msmith@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 <stand.h>
#include <machine/stdarg.h>
#include <bootstrap.h>
#include "acfreebsd.h"
#include "actypes.h"
#include "actbl.h"
/*
* Detect ACPI and export information about the APCI BIOS into the
* environment.
*/
static RSDP_DESCRIPTOR *biosacpi_find_rsdp(void);
static RSDP_DESCRIPTOR *biosacpi_search_rsdp(char *base, int length);
#define RSDP_CHECKSUM_LENGTH 20
void
biosacpi_detect(void)
{
RSDP_DESCRIPTOR *rsdp;
char buf[16];
int revision;
/* XXX check the BIOS datestamp */
/* locate and validate the RSDP */
if ((rsdp = biosacpi_find_rsdp()) == NULL)
return;
/* export values from the RSDP */
revision = rsdp->Revision;
if (revision == 0)
revision = 1;
sprintf(buf, "%d", revision);
setenv("hint.acpi.0.revision", buf, 1);
sprintf(buf, "%6s", rsdp->OemId);
setenv("hint.acpi.0.oem", buf, 1);
sprintf(buf, "0x%08x", rsdp->RsdtPhysicalAddress);
setenv("hint.acpi.0.rsdt", buf, 1);
if (revision >= 2) {
/* XXX extended checksum? */
sprintf(buf, "0x%016llx", rsdp->XsdtPhysicalAddress);
setenv("hint.acpi.0.xsdt", buf, 1);
sprintf(buf, "%d", rsdp->Length);
setenv("hint.acpi.0.xsdt_length", buf, 1);
}
/* XXX other tables? */
setenv("acpi_load", "YES", 1);
}
/*
* Find the RSDP in low memory.
*/
static RSDP_DESCRIPTOR *
biosacpi_find_rsdp(void)
{
RSDP_DESCRIPTOR *rsdp;
/* search the EBDA */
if ((rsdp = biosacpi_search_rsdp((char *)0, 0x400)) != NULL)
return(rsdp);
/* search the BIOS space */
if ((rsdp = biosacpi_search_rsdp((char *)0xe0000, 0x20000)) != NULL)
return(rsdp);
return(NULL);
}
static RSDP_DESCRIPTOR *
biosacpi_search_rsdp(char *base, int length)
{
RSDP_DESCRIPTOR *rsdp;
u_int8_t *cp, sum;
int ofs, idx;
/* search on 16-byte boundaries */
for (ofs = 0; ofs < length; ofs += 16) {
rsdp = (RSDP_DESCRIPTOR *)(base + ofs);
/* compare signature, validate checksum */
if (!strncmp(rsdp->Signature, RSDP_SIG, strlen(RSDP_SIG))) {
cp = (u_int8_t *)rsdp;
sum = 0;
for (idx = 0; idx < RSDP_CHECKSUM_LENGTH; idx++)
sum += *(cp + idx);
if (sum != 0) {
printf("acpi: bad RSDP checksum (%d)\n", sum);
continue;
}
return(rsdp);
}
}
return(NULL);
}
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