// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 /****************************************************************************** * * Module Name: tbxfload - Table load/unload external interfaces * * Copyright (C) 2000 - 2025, Intel Corp. * *****************************************************************************/ #define EXPORT_ACPI_INTERFACES #include <acpi/acpi.h> #include "accommon.h" #include "acnamesp.h" #include "actables.h" #include "acevents.h" #define _COMPONENT ACPI_TABLES ACPI_MODULE_NAME("tbxfload") /******************************************************************************* * * FUNCTION: acpi_load_tables * * PARAMETERS: None * * RETURN: Status * * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT * ******************************************************************************/ acpi_status ACPI_INIT_FUNCTION acpi_load_tables(void) { acpi_status status; ACPI_FUNCTION_TRACE(acpi_load_tables); /* * Install the default operation region handlers. These are the * handlers that are defined by the ACPI specification to be * "always accessible" -- namely, system_memory, system_IO, and * PCI_Config. This also means that no _REG methods need to be * run for these address spaces. We need to have these handlers * installed before any AML code can be executed, especially any * module-level code (11/2015). * Note that we allow OSPMs to install their own region handlers * between acpi_initialize_subsystem() and acpi_load_tables() to use * their customized default region handlers. */ status = acpi_ev_install_region_handlers(); if (ACPI_FAILURE(status)) { ACPI_EXCEPTION((AE_INFO, status, "During Region initialization")); return_ACPI_STATUS(status); } /* Load the namespace from the tables */ status = acpi_tb_load_namespace(); /* Don't let single failures abort the load */ if (status == AE_CTRL_TERMINATE) { status = AE_OK; } if (ACPI_FAILURE(status)) { ACPI_EXCEPTION((AE_INFO, status, "While loading namespace from ACPI tables")); } /* * Initialize the objects in the namespace that remain uninitialized. * This runs the executable AML that may be part of the declaration of * these name objects: * operation_regions, buffer_fields, Buffers, and Packages. * */ status = acpi_ns_initialize_objects(); if (ACPI_SUCCESS(status)) { acpi_gbl_namespace_initialized = TRUE; } return_ACPI_STATUS(status); } ACPI_EXPORT_SYMBOL_INIT(acpi_load_tables) /******************************************************************************* * * FUNCTION: acpi_tb_load_namespace * * PARAMETERS: None * * RETURN: Status * * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in * the RSDT/XSDT. * ******************************************************************************/ acpi_status acpi_tb_load_namespace(void) { acpi_status status; u32 i; struct acpi_table_header *new_dsdt; struct acpi_table_desc *table; u32 tables_loaded = 0; u32 tables_failed = 0; ACPI_FUNCTION_TRACE(tb_load_namespace); (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); /* * Load the namespace. The DSDT is required, but any SSDT and * PSDT tables are optional. Verify the DSDT. */ table = &acpi_gbl_root_table_list.tables[acpi_gbl_dsdt_index]; if (!acpi_gbl_root_table_list.current_table_count || !ACPI_COMPARE_NAMESEG(table->signature.ascii, ACPI_SIG_DSDT) || ACPI_FAILURE(acpi_tb_validate_table(table))) { status = AE_NO_ACPI_TABLES; goto unlock_and_exit; } /* * Save the DSDT pointer for simple access. This is the mapped memory * address. We must take care here because the address of the .Tables * array can change dynamically as tables are loaded at run-time. Note: * .Pointer field is not validated until after call to acpi_tb_validate_table. */ acpi_gbl_DSDT = table->pointer; /* * Optionally copy the entire DSDT to local memory (instead of simply * mapping it.) There are some BIOSs that corrupt or replace the original * DSDT, creating the need for this option. Default is FALSE, do not copy * the DSDT. */ if (acpi_gbl_copy_dsdt_locally) { new_dsdt = acpi_tb_copy_dsdt(acpi_gbl_dsdt_index); if (new_dsdt) { acpi_gbl_DSDT = new_dsdt; } } /* * Save the original DSDT header for detection of table corruption * and/or replacement of the DSDT from outside the OS. */ memcpy(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT, sizeof(struct acpi_table_header)); /* Load and parse tables */ (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); status = acpi_ns_load_table(acpi_gbl_dsdt_index, acpi_gbl_root_node); (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); if (ACPI_FAILURE(status)) { ACPI_EXCEPTION((AE_INFO, status, "[DSDT] table load failed")); tables_failed++; } else { tables_loaded++; } /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */ for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) { table = &acpi_gbl_root_table_list.tables[i]; if (!table->address || (!ACPI_COMPARE_NAMESEG (table->signature.ascii, ACPI_SIG_SSDT) && !ACPI_COMPARE_NAMESEG(table->signature.ascii, ACPI_SIG_PSDT) && !ACPI_COMPARE_NAMESEG(table->signature.ascii, ACPI_SIG_OSDT)) || ACPI_FAILURE(acpi_tb_validate_table(table))) { continue; } /* Ignore errors while loading tables, get as many as possible */ (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); status = acpi_ns_load_table(i, acpi_gbl_root_node); (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); if (ACPI_FAILURE(status)) { ACPI_EXCEPTION((AE_INFO, status, "(%4.4s:%8.8s) while loading table", table->signature.ascii, table->pointer->oem_table_id)); tables_failed++; ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "Table [%4.4s:%8.8s] (id FF) - Table namespace load failed\n\n", table->signature.ascii, table->pointer->oem_table_id)); } else { tables_loaded++; } } if (!tables_failed) { ACPI_INFO(("%u ACPI AML tables successfully acquired and loaded", tables_loaded)); } else { ACPI_ERROR((AE_INFO, "%u table load failures, %u successful", tables_failed, tables_loaded)); /* Indicate at least one failure */ status = AE_CTRL_TERMINATE; } #ifdef ACPI_APPLICATION ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "\n")); #endif unlock_and_exit: (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); return_ACPI_STATUS(status); } /******************************************************************************* * * FUNCTION: acpi_install_table * * PARAMETERS: table - Pointer to the ACPI table to be installed. * * RETURN: Status * * DESCRIPTION: Dynamically install an ACPI table. * Note: This function should only be invoked after * acpi_initialize_tables() and before acpi_load_tables(). * ******************************************************************************/ acpi_status ACPI_INIT_FUNCTION acpi_install_table(struct acpi_table_header *table) { acpi_status status; u32 table_index; ACPI_FUNCTION_TRACE(acpi_install_table); status = acpi_tb_install_standard_table(ACPI_PTR_TO_PHYSADDR(table), ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL, table, FALSE, FALSE, &table_index); return_ACPI_STATUS(status); } ACPI_EXPORT_SYMBOL_INIT(acpi_install_table) /******************************************************************************* * * FUNCTION: acpi_install_physical_table * * PARAMETERS: address - Address of the ACPI table to be installed. * * RETURN: Status * * DESCRIPTION: Dynamically install an ACPI table. * Note: This function should only be invoked after * acpi_initialize_tables() and before acpi_load_tables(). * ******************************************************************************/ acpi_status ACPI_INIT_FUNCTION acpi_install_physical_table(acpi_physical_address address) { acpi_status status; u32 table_index; ACPI_FUNCTION_TRACE(acpi_install_physical_table); status = acpi_tb_install_standard_table(address, ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL, NULL, FALSE, FALSE, &table_index); return_ACPI_STATUS(status); } ACPI_EXPORT_SYMBOL_INIT(acpi_install_physical_table) /******************************************************************************* * * FUNCTION: acpi_load_table * * PARAMETERS: table - Pointer to a buffer containing the ACPI * table to be loaded. * table_idx - Pointer to a u32 for storing the table * index, might be NULL * * RETURN: Status * * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must * be a valid ACPI table with a valid ACPI table header. * Note1: Mainly intended to support hotplug addition of SSDTs. * Note2: Does not copy the incoming table. User is responsible * to ensure that the table is not deleted or unmapped. * ******************************************************************************/ acpi_status acpi_load_table(struct acpi_table_header *table, u32 *table_idx) { acpi_status status; u32 table_index; ACPI_FUNCTION_TRACE(acpi_load_table); /* Parameter validation */ if (!table) { return_ACPI_STATUS(AE_BAD_PARAMETER); } /* Install the table and load it into the namespace */ ACPI_INFO(("Host-directed Dynamic ACPI Table Load:")); status = acpi_tb_install_and_load_table(ACPI_PTR_TO_PHYSADDR(table), ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL, table, FALSE, &table_index); if (table_idx) { *table_idx = table_index; } if (ACPI_SUCCESS(status)) { /* Complete the initialization/resolution of new objects */ acpi_ns_initialize_objects(); } return_ACPI_STATUS(status); } ACPI_EXPORT_SYMBOL(acpi_load_table) /******************************************************************************* * * FUNCTION: acpi_unload_parent_table * * PARAMETERS: object - Handle to any namespace object owned by * the table to be unloaded * * RETURN: Status * * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads * the table and deletes all namespace objects associated with * that table. Unloading of the DSDT is not allowed. * Note: Mainly intended to support hotplug removal of SSDTs. * ******************************************************************************/ acpi_status acpi_unload_parent_table(acpi_handle object) { struct acpi_namespace_node *node = ACPI_CAST_PTR(struct acpi_namespace_node, object); acpi_status status = AE_NOT_EXIST; acpi_owner_id owner_id; u32 i; ACPI_FUNCTION_TRACE(acpi_unload_parent_table); /* Parameter validation */ if (!object) { return_ACPI_STATUS(AE_BAD_PARAMETER); } /* * The node owner_id is currently the same as the parent table ID. * However, this could change in the future. */ owner_id = node->owner_id; if (!owner_id) { /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */ return_ACPI_STATUS(AE_TYPE); } /* Must acquire the table lock during this operation */ status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } /* Find the table in the global table list */ for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) { if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) { continue; } /* * Allow unload of SSDT and OEMx tables only. Do not allow unload * of the DSDT. No other types of tables should get here, since * only these types can contain AML and thus are the only types * that can create namespace objects. */ if (ACPI_COMPARE_NAMESEG (acpi_gbl_root_table_list.tables[i].signature.ascii, ACPI_SIG_DSDT)) { status = AE_TYPE; break; } (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); status = acpi_tb_unload_table(i); (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); break; } (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); return_ACPI_STATUS(status); } ACPI_EXPORT_SYMBOL(acpi_unload_parent_table) /******************************************************************************* * * FUNCTION: acpi_unload_table * * PARAMETERS: table_index - Index as returned by acpi_load_table * * RETURN: Status * * DESCRIPTION: Via the table_index representing an SSDT or OEMx table, unloads * the table and deletes all namespace objects associated with * that table. Unloading of the DSDT is not allowed. * Note: Mainly intended to support hotplug removal of SSDTs. * ******************************************************************************/ acpi_status acpi_unload_table(u32 table_index) { acpi_status status; ACPI_FUNCTION_TRACE(acpi_unload_table); if (table_index == 1) { /* table_index==1 means DSDT is the owner. DSDT cannot be unloaded */ return_ACPI_STATUS(AE_TYPE); } status = acpi_tb_unload_table(table_index); return_ACPI_STATUS(status); } ACPI_EXPORT_SYMBOL(acpi_unload_table)
