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/*-
* Copyright (c) 2002 Mitsaru Iwasaki
* 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.
*/
/*
* ACPI Table interfaces
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/endian.h>
#include <sys/kernel.h>
#include <sys/linker.h>
#include <contrib/dev/acpica/acpi.h>
#include <contrib/dev/acpica/actables.h>
#undef _COMPONENT
#define _COMPONENT ACPI_TABLES
static char acpi_osname[128];
TUNABLE_STR("hw.acpi.osname", acpi_osname, sizeof(acpi_osname));
static struct {
ACPI_TABLE_HEADER_DEF
uint32_t no_op;
} __packed fake_ssdt;
ACPI_STATUS
AcpiOsPredefinedOverride (
const ACPI_PREDEFINED_NAMES *InitVal,
ACPI_STRING *NewVal)
{
if (InitVal == NULL || NewVal == NULL)
return (AE_BAD_PARAMETER);
*NewVal = NULL;
if (strncmp(InitVal->Name, "_OS_", 4) == 0 && strlen(acpi_osname) > 0) {
printf("ACPI: Overriding _OS definition with \"%s\"\n", acpi_osname);
*NewVal = acpi_osname;
}
return (AE_OK);
}
ACPI_STATUS
AcpiOsTableOverride (
ACPI_TABLE_HEADER *ExistingTable,
ACPI_TABLE_HEADER **NewTable)
{
caddr_t acpi_dsdt, p;
if (ExistingTable == NULL || NewTable == NULL)
return (AE_BAD_PARAMETER);
/* If we're not overriding the DSDT, just return. */
*NewTable = NULL;
if ((acpi_dsdt = preload_search_by_type("acpi_dsdt")) == NULL)
return (AE_OK);
if ((p = preload_search_info(acpi_dsdt, MODINFO_ADDR)) == NULL)
return (AE_OK);
/*
* Override the DSDT with the user's custom version. Override the
* contents of any SSDTs with a simple no-op table since the user's
* DSDT is expected to contain their contents as well.
*/
if (strncmp(ExistingTable->Signature, "DSDT", 4) == 0) {
printf("ACPI: overriding DSDT/SSDT with custom table\n");
*NewTable = *(void **)p;
} else if (strncmp(ExistingTable->Signature, "SSDT", 4) == 0) {
if (fake_ssdt.Length == 0) {
sprintf(fake_ssdt.Signature, "%.4s", "SSDT");
fake_ssdt.Length = htole32(sizeof(fake_ssdt));
fake_ssdt.Revision = 2;
fake_ssdt.Checksum = 0;
sprintf(fake_ssdt.OemId, "%.6s", "FBSD ");
sprintf(fake_ssdt.OemTableId, "%.8s", "NullSSDT");
fake_ssdt.OemRevision = htole32(1);
sprintf(fake_ssdt.AslCompilerId, "%.4s", "FBSD");
fake_ssdt.AslCompilerRevision = htole32(1);
fake_ssdt.no_op = htole32(0x005c0310); /* Scope(\) */
fake_ssdt.Checksum -= AcpiTbGenerateChecksum(&fake_ssdt,
sizeof(fake_ssdt));
}
*NewTable = (void *)&fake_ssdt;
}
return (AE_OK);
}
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