145 lines
4.5 KiB
C
145 lines
4.5 KiB
C
/*-
|
|
* 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <stand.h>
|
|
#include <machine/stdarg.h>
|
|
#include <bootstrap.h>
|
|
#include <btxv86.h>
|
|
#include "libi386.h"
|
|
|
|
#include "platform/acfreebsd.h"
|
|
#include "acconfig.h"
|
|
#define ACPI_SYSTEM_XFACE
|
|
#include "actypes.h"
|
|
#include "actbl.h"
|
|
|
|
/*
|
|
* Detect ACPI and export information about the ACPI BIOS into the
|
|
* environment.
|
|
*/
|
|
|
|
static ACPI_TABLE_RSDP *biosacpi_find_rsdp(void);
|
|
static ACPI_TABLE_RSDP *biosacpi_search_rsdp(char *base, int length);
|
|
|
|
#define RSDP_CHECKSUM_LENGTH 20
|
|
|
|
void
|
|
biosacpi_detect(void)
|
|
{
|
|
ACPI_TABLE_RSDP *rsdp;
|
|
char buf[24];
|
|
int revision;
|
|
|
|
/* locate and validate the RSDP */
|
|
if ((rsdp = biosacpi_find_rsdp()) == NULL)
|
|
return;
|
|
|
|
/*
|
|
* Report the RSDP to the kernel. While this can be found with
|
|
* a BIOS boot, the RSDP may be elsewhere when booted from UEFI.
|
|
* The old code used the 'hints' method to communite this to
|
|
* the kernel. However, while convenient, the 'hints' method
|
|
* is fragile and does not work when static hints are compiled
|
|
* into the kernel. Instead, move to setting different tunables
|
|
* that start with acpi. The old 'hints' can be removed before
|
|
* we branch for FreeBSD 12.
|
|
*/
|
|
sprintf(buf, "0x%08x", VTOP(rsdp));
|
|
setenv("hint.acpi.0.rsdp", buf, 1);
|
|
setenv("acpi.rsdp", buf, 1);
|
|
revision = rsdp->Revision;
|
|
if (revision == 0)
|
|
revision = 1;
|
|
sprintf(buf, "%d", revision);
|
|
setenv("hint.acpi.0.revision", buf, 1);
|
|
setenv("acpi.revision", buf, 1);
|
|
strncpy(buf, rsdp->OemId, sizeof(rsdp->OemId));
|
|
buf[sizeof(rsdp->OemId)] = '\0';
|
|
setenv("hint.acpi.0.oem", buf, 1);
|
|
setenv("acpi.oem", buf, 1);
|
|
sprintf(buf, "0x%08x", rsdp->RsdtPhysicalAddress);
|
|
setenv("hint.acpi.0.rsdt", buf, 1);
|
|
setenv("acpi.rsdt", buf, 1);
|
|
if (revision >= 2) {
|
|
/* XXX extended checksum? */
|
|
sprintf(buf, "0x%016llx", rsdp->XsdtPhysicalAddress);
|
|
setenv("hint.acpi.0.xsdt", buf, 1);
|
|
setenv("acpi.xsdt", buf, 1);
|
|
sprintf(buf, "%d", rsdp->Length);
|
|
setenv("hint.acpi.0.xsdt_length", buf, 1);
|
|
setenv("acpi.xsdt_length", buf, 1);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Find the RSDP in low memory. See section 5.2.2 of the ACPI spec.
|
|
*/
|
|
static ACPI_TABLE_RSDP *
|
|
biosacpi_find_rsdp(void)
|
|
{
|
|
ACPI_TABLE_RSDP *rsdp;
|
|
uint16_t *addr;
|
|
|
|
/* EBDA is the 1 KB addressed by the 16 bit pointer at 0x40E. */
|
|
addr = (uint16_t *)PTOV(0x40E);
|
|
if ((rsdp = biosacpi_search_rsdp((char *)(*addr << 4), 0x400)) != NULL)
|
|
return (rsdp);
|
|
|
|
/* Check the upper memory BIOS space, 0xe0000 - 0xfffff. */
|
|
if ((rsdp = biosacpi_search_rsdp((char *)0xe0000, 0x20000)) != NULL)
|
|
return (rsdp);
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
static ACPI_TABLE_RSDP *
|
|
biosacpi_search_rsdp(char *base, int length)
|
|
{
|
|
ACPI_TABLE_RSDP *rsdp;
|
|
u_int8_t *cp, sum;
|
|
int ofs, idx;
|
|
|
|
/* search on 16-byte boundaries */
|
|
for (ofs = 0; ofs < length; ofs += 16) {
|
|
rsdp = (ACPI_TABLE_RSDP *)PTOV(base + ofs);
|
|
|
|
/* compare signature, validate checksum */
|
|
if (!strncmp(rsdp->Signature, ACPI_SIG_RSDP, strlen(ACPI_SIG_RSDP))) {
|
|
cp = (u_int8_t *)rsdp;
|
|
sum = 0;
|
|
for (idx = 0; idx < RSDP_CHECKSUM_LENGTH; idx++)
|
|
sum += *(cp + idx);
|
|
if (sum != 0)
|
|
continue;
|
|
return(rsdp);
|
|
}
|
|
}
|
|
return(NULL);
|
|
}
|