/****************************************************************************** * * Module Name: tbxfload - Table load/unload external interfaces * *****************************************************************************/ /* * Copyright (C) 2000 - 2014, Intel Corp. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions, and the following disclaimer, * without modification. * 2. Redistributions in binary form must reproduce at minimum a disclaimer * substantially similar to the "NO WARRANTY" disclaimer below * ("Disclaimer") and any redistribution must be conditioned upon * including a substantially similar Disclaimer requirement for further * binary redistribution. * 3. Neither the names of the above-listed copyright holders nor the names * of any contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * Alternatively, this software may be distributed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * * NO WARRANTY * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGES. */ #define EXPORT_ACPI_INTERFACES #include #include "accommon.h" #include "acnamesp.h" #include "actables.h" #define _COMPONENT ACPI_TABLES ACPI_MODULE_NAME("tbxfload") /* Local prototypes */ static acpi_status acpi_tb_load_namespace(void); /******************************************************************************* * * FUNCTION: acpi_load_tables * * PARAMETERS: None * * RETURN: Status * * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT * ******************************************************************************/ acpi_status __init acpi_load_tables(void) { acpi_status status; ACPI_FUNCTION_TRACE(acpi_load_tables); /* Load the namespace from the tables */ status = acpi_tb_load_namespace(); if (ACPI_FAILURE(status)) { ACPI_EXCEPTION((AE_INFO, status, "While loading namespace from ACPI tables")); } 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. * ******************************************************************************/ static acpi_status acpi_tb_load_namespace(void) { acpi_status status; u32 i; struct acpi_table_header *new_dsdt; 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. */ if (!acpi_gbl_root_table_list.current_table_count || !ACPI_COMPARE_NAME(& (acpi_gbl_root_table_list. tables[ACPI_TABLE_INDEX_DSDT].signature), ACPI_SIG_DSDT) || ACPI_FAILURE(acpi_tb_validate_table (&acpi_gbl_root_table_list. tables[ACPI_TABLE_INDEX_DSDT]))) { 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 = acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].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_TABLE_INDEX_DSDT); 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. */ ACPI_MEMCPY(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT, sizeof(struct acpi_table_header)); (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); /* Load and parse tables */ status = acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT, acpi_gbl_root_node); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */ (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) { if ((!ACPI_COMPARE_NAME (&(acpi_gbl_root_table_list.tables[i].signature), ACPI_SIG_SSDT) && !ACPI_COMPARE_NAME(& (acpi_gbl_root_table_list.tables[i]. signature), ACPI_SIG_PSDT)) || ACPI_FAILURE(acpi_tb_validate_table (&acpi_gbl_root_table_list.tables[i]))) { continue; } /* Ignore errors while loading tables, get as many as possible */ (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); (void)acpi_ns_load_table(i, acpi_gbl_root_node); (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); } ACPI_INFO((AE_INFO, "All ACPI Tables successfully acquired")); unlock_and_exit: (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); return_ACPI_STATUS(status); } /******************************************************************************* * * FUNCTION: acpi_install_table * * PARAMETERS: address - Address of the ACPI table to be installed. * physical - Whether the address is a physical table * address or not * * 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 __init acpi_install_table(acpi_physical_address address, u8 physical) { acpi_status status; u8 flags; u32 table_index; ACPI_FUNCTION_TRACE(acpi_install_table); if (physical) { flags = ACPI_TABLE_ORIGIN_EXTERN_VIRTUAL; } else { flags = ACPI_TABLE_ORIGIN_INTERN_PHYSICAL; } status = acpi_tb_install_non_fixed_table(address, flags, FALSE, FALSE, &table_index); return_ACPI_STATUS(status); } ACPI_EXPORT_SYMBOL_INIT(acpi_install_table) /******************************************************************************* * * FUNCTION: acpi_load_table * * PARAMETERS: table - Pointer to a buffer containing the ACPI * table to be loaded. * * 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) { acpi_status status; u32 table_index; ACPI_FUNCTION_TRACE(acpi_load_table); /* Parameter validation */ if (!table) { return_ACPI_STATUS(AE_BAD_PARAMETER); } /* Must acquire the interpreter lock during this operation */ status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER); if (ACPI_FAILURE(status)) { return_ACPI_STATUS(status); } /* Install the table and load it into the namespace */ ACPI_INFO((AE_INFO, "Host-directed Dynamic ACPI Table Load:")); (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); status = acpi_tb_install_non_fixed_table(ACPI_PTR_TO_PHYSADDR(table), ACPI_TABLE_ORIGIN_EXTERN_VIRTUAL, TRUE, FALSE, &table_index); (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); if (ACPI_FAILURE(status)) { goto unlock_and_exit; } /* * Note: Now table is "INSTALLED", it must be validated before * using. */ status = acpi_tb_validate_table(&acpi_gbl_root_table_list. tables[table_index]); if (ACPI_FAILURE(status)) { goto unlock_and_exit; } status = acpi_ns_load_table(table_index, acpi_gbl_root_node); /* Invoke table handler if present */ if (acpi_gbl_table_handler) { (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table, acpi_gbl_table_handler_context); } unlock_and_exit: (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER); 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 interpreter lock during this operation */ status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER); 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_NAME (acpi_gbl_root_table_list.tables[i].signature.ascii, ACPI_SIG_DSDT)) { status = AE_TYPE; break; } /* Ensure the table is actually loaded */ if (!acpi_tb_is_table_loaded(i)) { status = AE_NOT_EXIST; break; } /* Invoke table handler if present */ if (acpi_gbl_table_handler) { (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD, acpi_gbl_root_table_list. tables[i].pointer, acpi_gbl_table_handler_context); } /* * Delete all namespace objects owned by this table. Note that * these objects can appear anywhere in the namespace by virtue * of the AML "Scope" operator. Thus, we need to track ownership * by an ID, not simply a position within the hierarchy. */ status = acpi_tb_delete_namespace_by_owner(i); if (ACPI_FAILURE(status)) { break; } status = acpi_tb_release_owner_id(i); acpi_tb_set_table_loaded_flag(i, FALSE); break; } (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER); return_ACPI_STATUS(status); } ACPI_EXPORT_SYMBOL(acpi_unload_parent_table)