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1// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.02/******************************************************************************3 *4 * Module Name: tbfind - find table5 *6 * Copyright (C) 2000 - 2023, Intel Corp.7 *8 *****************************************************************************/9 10#include <acpi/acpi.h>11#include "accommon.h"12#include "actables.h"13 14#define _COMPONENT ACPI_TABLES15ACPI_MODULE_NAME("tbfind")16 17/*******************************************************************************18 *19 * FUNCTION: acpi_tb_find_table20 *21 * PARAMETERS: signature - String with ACPI table signature22 * oem_id - String with the table OEM ID23 * oem_table_id - String with the OEM Table ID24 * table_index - Where the table index is returned25 *26 * RETURN: Status and table index27 *28 * DESCRIPTION: Find an ACPI table (in the RSDT/XSDT) that matches the29 * Signature, OEM ID and OEM Table ID. Returns an index that can30 * be used to get the table header or entire table.31 *32 ******************************************************************************/33acpi_status34acpi_tb_find_table(char *signature,35 char *oem_id, char *oem_table_id, u32 *table_index)36{37 acpi_status status = AE_OK;38 struct acpi_table_header header;39 u32 i;40 41 ACPI_FUNCTION_TRACE(tb_find_table);42 43 /* Validate the input table signature */44 45 if (!acpi_ut_valid_nameseg(signature)) {46 return_ACPI_STATUS(AE_BAD_SIGNATURE);47 }48 49 /* Don't allow the OEM strings to be too long */50 51 if ((strlen(oem_id) > ACPI_OEM_ID_SIZE) ||52 (strlen(oem_table_id) > ACPI_OEM_TABLE_ID_SIZE)) {53 return_ACPI_STATUS(AE_AML_STRING_LIMIT);54 }55 56 /* Normalize the input strings */57 58 memset(&header, 0, sizeof(struct acpi_table_header));59 ACPI_COPY_NAMESEG(header.signature, signature);60 strncpy(header.oem_id, oem_id, ACPI_OEM_ID_SIZE);61 strncpy(header.oem_table_id, oem_table_id, ACPI_OEM_TABLE_ID_SIZE);62 63 /* Search for the table */64 65 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);66 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {67 if (memcmp(&(acpi_gbl_root_table_list.tables[i].signature),68 header.signature, ACPI_NAMESEG_SIZE)) {69 70 /* Not the requested table */71 72 continue;73 }74 75 /* Table with matching signature has been found */76 77 if (!acpi_gbl_root_table_list.tables[i].pointer) {78 79 /* Table is not currently mapped, map it */80 81 status =82 acpi_tb_validate_table(&acpi_gbl_root_table_list.83 tables[i]);84 if (ACPI_FAILURE(status)) {85 goto unlock_and_exit;86 }87 88 if (!acpi_gbl_root_table_list.tables[i].pointer) {89 continue;90 }91 }92 93 /* Check for table match on all IDs */94 95 if (!memcmp96 (acpi_gbl_root_table_list.tables[i].pointer->signature,97 header.signature, ACPI_NAMESEG_SIZE) && (!oem_id[0]98 ||99 !memcmp100 (acpi_gbl_root_table_list.101 tables[i].102 pointer->oem_id,103 header.oem_id,104 ACPI_OEM_ID_SIZE))105 && (!oem_table_id[0]106 || !memcmp(acpi_gbl_root_table_list.tables[i].pointer->107 oem_table_id, header.oem_table_id,108 ACPI_OEM_TABLE_ID_SIZE))) {109 *table_index = i;110 111 ACPI_DEBUG_PRINT((ACPI_DB_TABLES,112 "Found table [%4.4s]\n",113 header.signature));114 goto unlock_and_exit;115 }116 }117 status = AE_NOT_FOUND;118 119unlock_and_exit:120 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);121 return_ACPI_STATUS(status);122}123