// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: tbfind - find table
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*
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* Copyright (C) 2000 - 2020, Intel Corp.
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*
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*****************************************************************************/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "actables.h"
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#define _COMPONENT ACPI_TABLES
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ACPI_MODULE_NAME("tbfind")
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_find_table
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*
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* PARAMETERS: signature - String with ACPI table signature
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* oem_id - String with the table OEM ID
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* oem_table_id - String with the OEM Table ID
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* table_index - Where the table index is returned
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*
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* RETURN: Status and table index
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*
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* DESCRIPTION: Find an ACPI table (in the RSDT/XSDT) that matches the
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* Signature, OEM ID and OEM Table ID. Returns an index that can
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* be used to get the table header or entire table.
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*
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******************************************************************************/
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acpi_status
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acpi_tb_find_table(char *signature,
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char *oem_id, char *oem_table_id, u32 *table_index)
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{
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acpi_status status = AE_OK;
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struct acpi_table_header header;
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u32 i;
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ACPI_FUNCTION_TRACE(tb_find_table);
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/* Validate the input table signature */
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if (!acpi_ut_valid_nameseg(signature)) {
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return_ACPI_STATUS(AE_BAD_SIGNATURE);
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}
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/* Don't allow the OEM strings to be too long */
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if ((strlen(oem_id) > ACPI_OEM_ID_SIZE) ||
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(strlen(oem_table_id) > ACPI_OEM_TABLE_ID_SIZE)) {
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return_ACPI_STATUS(AE_AML_STRING_LIMIT);
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}
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/* Normalize the input strings */
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memset(&header, 0, sizeof(struct acpi_table_header));
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ACPI_COPY_NAMESEG(header.signature, signature);
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strncpy(header.oem_id, oem_id, ACPI_OEM_ID_SIZE);
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strncpy(header.oem_table_id, oem_table_id, ACPI_OEM_TABLE_ID_SIZE);
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/* Search for the table */
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(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
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for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
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if (memcmp(&(acpi_gbl_root_table_list.tables[i].signature),
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header.signature, ACPI_NAMESEG_SIZE)) {
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/* Not the requested table */
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continue;
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}
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/* Table with matching signature has been found */
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if (!acpi_gbl_root_table_list.tables[i].pointer) {
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/* Table is not currently mapped, map it */
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status =
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acpi_tb_validate_table(&acpi_gbl_root_table_list.
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tables[i]);
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if (ACPI_FAILURE(status)) {
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goto unlock_and_exit;
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}
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if (!acpi_gbl_root_table_list.tables[i].pointer) {
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continue;
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}
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}
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/* Check for table match on all IDs */
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if (!memcmp
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(acpi_gbl_root_table_list.tables[i].pointer->signature,
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header.signature, ACPI_NAMESEG_SIZE) && (!oem_id[0]
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||
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!memcmp
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(acpi_gbl_root_table_list.
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tables[i].
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pointer->oem_id,
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header.oem_id,
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ACPI_OEM_ID_SIZE))
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&& (!oem_table_id[0]
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|| !memcmp(acpi_gbl_root_table_list.tables[i].pointer->
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oem_table_id, header.oem_table_id,
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ACPI_OEM_TABLE_ID_SIZE))) {
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*table_index = i;
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ACPI_DEBUG_PRINT((ACPI_DB_TABLES,
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"Found table [%4.4s]\n",
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header.signature));
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goto unlock_and_exit;
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}
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}
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status = AE_NOT_FOUND;
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unlock_and_exit:
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(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
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return_ACPI_STATUS(status);
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}
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