mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-21 11:44:01 +08:00
9585763888
Signed-off-by: Erik Schmauss <erik.schmauss@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
123 lines
3.4 KiB
C
123 lines
3.4 KiB
C
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
|
|
/******************************************************************************
|
|
*
|
|
* Module Name: tbfind - find table
|
|
*
|
|
* Copyright (C) 2000 - 2018, Intel Corp.
|
|
*
|
|
*****************************************************************************/
|
|
|
|
#include <acpi/acpi.h>
|
|
#include "accommon.h"
|
|
#include "actables.h"
|
|
|
|
#define _COMPONENT ACPI_TABLES
|
|
ACPI_MODULE_NAME("tbfind")
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_tb_find_table
|
|
*
|
|
* PARAMETERS: signature - String with ACPI table signature
|
|
* oem_id - String with the table OEM ID
|
|
* oem_table_id - String with the OEM Table ID
|
|
* table_index - Where the table index is returned
|
|
*
|
|
* RETURN: Status and table index
|
|
*
|
|
* DESCRIPTION: Find an ACPI table (in the RSDT/XSDT) that matches the
|
|
* Signature, OEM ID and OEM Table ID. Returns an index that can
|
|
* be used to get the table header or entire table.
|
|
*
|
|
******************************************************************************/
|
|
acpi_status
|
|
acpi_tb_find_table(char *signature,
|
|
char *oem_id, char *oem_table_id, u32 *table_index)
|
|
{
|
|
acpi_status status = AE_OK;
|
|
struct acpi_table_header header;
|
|
u32 i;
|
|
|
|
ACPI_FUNCTION_TRACE(tb_find_table);
|
|
|
|
/* Validate the input table signature */
|
|
|
|
if (!acpi_ut_valid_nameseg(signature)) {
|
|
return_ACPI_STATUS(AE_BAD_SIGNATURE);
|
|
}
|
|
|
|
/* Don't allow the OEM strings to be too long */
|
|
|
|
if ((strlen(oem_id) > ACPI_OEM_ID_SIZE) ||
|
|
(strlen(oem_table_id) > ACPI_OEM_TABLE_ID_SIZE)) {
|
|
return_ACPI_STATUS(AE_AML_STRING_LIMIT);
|
|
}
|
|
|
|
/* Normalize the input strings */
|
|
|
|
memset(&header, 0, sizeof(struct acpi_table_header));
|
|
ACPI_MOVE_NAME(header.signature, signature);
|
|
strncpy(header.oem_id, oem_id, ACPI_OEM_ID_SIZE);
|
|
strncpy(header.oem_table_id, oem_table_id, ACPI_OEM_TABLE_ID_SIZE);
|
|
|
|
/* Search for the table */
|
|
|
|
(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
|
|
for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
|
|
if (memcmp(&(acpi_gbl_root_table_list.tables[i].signature),
|
|
header.signature, ACPI_NAME_SIZE)) {
|
|
|
|
/* Not the requested table */
|
|
|
|
continue;
|
|
}
|
|
|
|
/* Table with matching signature has been found */
|
|
|
|
if (!acpi_gbl_root_table_list.tables[i].pointer) {
|
|
|
|
/* Table is not currently mapped, map it */
|
|
|
|
status =
|
|
acpi_tb_validate_table(&acpi_gbl_root_table_list.
|
|
tables[i]);
|
|
if (ACPI_FAILURE(status)) {
|
|
goto unlock_and_exit;
|
|
}
|
|
|
|
if (!acpi_gbl_root_table_list.tables[i].pointer) {
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/* Check for table match on all IDs */
|
|
|
|
if (!memcmp
|
|
(acpi_gbl_root_table_list.tables[i].pointer->signature,
|
|
header.signature, ACPI_NAME_SIZE) && (!oem_id[0]
|
|
||
|
|
!memcmp
|
|
(acpi_gbl_root_table_list.
|
|
tables[i].pointer->
|
|
oem_id,
|
|
header.oem_id,
|
|
ACPI_OEM_ID_SIZE))
|
|
&& (!oem_table_id[0]
|
|
|| !memcmp(acpi_gbl_root_table_list.tables[i].pointer->
|
|
oem_table_id, header.oem_table_id,
|
|
ACPI_OEM_TABLE_ID_SIZE))) {
|
|
*table_index = i;
|
|
|
|
ACPI_DEBUG_PRINT((ACPI_DB_TABLES,
|
|
"Found table [%4.4s]\n",
|
|
header.signature));
|
|
goto unlock_and_exit;
|
|
}
|
|
}
|
|
status = AE_NOT_FOUND;
|
|
|
|
unlock_and_exit:
|
|
(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
|
|
return_ACPI_STATUS(status);
|
|
}
|