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When the user overrides the DSDT, replace any SSDTs with a simple no-op

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table.  acpidump(8) concatenates the body of the DSDT and SSDTs so an
edited ASL will contain all the necessary information.  We can't use a
completely empty table since ACPI-CA reports this as a problem.

MFC after:	3 days
This commit is contained in:
njl 2004-10-05 20:41:44 +00:00
parent 5bec33804f
commit a28416559f
1 changed files with 40 additions and 10 deletions
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50
sys/dev/acpica/Osd/OsdTable.c
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@ -30,17 +30,25 @@
* ACPI Table interfaces
*/
#include "acpi.h"
#include <sys/param.h>
#include <sys/endian.h>
#include <sys/kernel.h>
#include <sys/linker.h>
#include "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,
@ -63,20 +71,42 @@ AcpiOsTableOverride (
ACPI_TABLE_HEADER *ExistingTable,
ACPI_TABLE_HEADER **NewTable)
{
caddr_t acpi_dsdt, p;
caddr_t acpi_dsdt, p;
if (ExistingTable == NULL || NewTable == NULL)
return(AE_BAD_PARAMETER);
return (AE_BAD_PARAMETER);
/* If we're not overriding the DSDT, just return. */
*NewTable = NULL;
if (strncmp(ExistingTable->Signature, "DSDT", 4) != 0)
return(AE_OK);
if ((acpi_dsdt = preload_search_by_type("acpi_dsdt")) == NULL)
return(AE_OK);
return (AE_OK);
if ((p = preload_search_info(acpi_dsdt, MODINFO_ADDR)) == NULL)
return(AE_OK);
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 -= AcpiTbChecksum(&fake_ssdt, sizeof(fake_ssdt));
}
*NewTable = (void *)&fake_ssdt;
}
*NewTable = *(void **)p;
printf("ACPI: DSDT was overridden.\n");
return (AE_OK);
}