423 lines
13 KiB
C
423 lines
13 KiB
C
/******************************************************************************
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*
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* Module Name: tbxface - Public interfaces to the ACPI subsystem
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* ACPI table oriented interfaces
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2005, R. Byron Moore
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <linux/module.h>
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#include <acpi/acpi.h>
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#include <acpi/acnamesp.h>
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#include <acpi/actables.h>
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#define _COMPONENT ACPI_TABLES
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ACPI_MODULE_NAME("tbxface")
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/*******************************************************************************
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*
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* FUNCTION: acpi_load_tables
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*
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* PARAMETERS: None
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*
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* RETURN: Status
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*
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* DESCRIPTION: This function is called to load the ACPI tables from the
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* provided RSDT
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*
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******************************************************************************/
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acpi_status acpi_load_tables(void)
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{
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struct acpi_pointer rsdp_address;
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acpi_status status;
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ACPI_FUNCTION_TRACE("acpi_load_tables");
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/* Get the RSDP */
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status = acpi_os_get_root_pointer(ACPI_LOGICAL_ADDRESSING,
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&rsdp_address);
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if (ACPI_FAILURE(status)) {
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ACPI_REPORT_ERROR(("acpi_load_tables: Could not get RSDP, %s\n",
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acpi_format_exception(status)));
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goto error_exit;
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}
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/* Map and validate the RSDP */
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acpi_gbl_table_flags = rsdp_address.pointer_type;
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status = acpi_tb_verify_rsdp(&rsdp_address);
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if (ACPI_FAILURE(status)) {
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ACPI_REPORT_ERROR(("acpi_load_tables: RSDP Failed validation: %s\n", acpi_format_exception(status)));
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goto error_exit;
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}
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/* Get the RSDT via the RSDP */
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status = acpi_tb_get_table_rsdt();
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if (ACPI_FAILURE(status)) {
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ACPI_REPORT_ERROR(("acpi_load_tables: Could not load RSDT: %s\n", acpi_format_exception(status)));
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goto error_exit;
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}
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/* Now get the tables needed by this subsystem (FADT, DSDT, etc.) */
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status = acpi_tb_get_required_tables();
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if (ACPI_FAILURE(status)) {
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ACPI_REPORT_ERROR(("acpi_load_tables: Error getting required tables (DSDT/FADT/FACS): %s\n", acpi_format_exception(status)));
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goto error_exit;
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}
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ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));
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/* Load the namespace from the tables */
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status = acpi_ns_load_namespace();
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if (ACPI_FAILURE(status)) {
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ACPI_REPORT_ERROR(("acpi_load_tables: Could not load namespace: %s\n", acpi_format_exception(status)));
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goto error_exit;
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}
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return_ACPI_STATUS(AE_OK);
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error_exit:
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ACPI_REPORT_ERROR(("acpi_load_tables: Could not load tables: %s\n",
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acpi_format_exception(status)));
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return_ACPI_STATUS(status);
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}
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#ifdef ACPI_FUTURE_USAGE
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/*******************************************************************************
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*
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* FUNCTION: acpi_load_table
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*
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* PARAMETERS: table_ptr - pointer to a buffer containing the entire
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* table to be loaded
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*
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* RETURN: Status
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*
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* DESCRIPTION: This function is called to load a table from the caller's
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* buffer. The buffer must contain an entire ACPI Table including
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* a valid header. The header fields will be verified, and if it
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* is determined that the table is invalid, the call will fail.
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*
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******************************************************************************/
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acpi_status acpi_load_table(struct acpi_table_header *table_ptr)
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{
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acpi_status status;
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struct acpi_table_desc table_info;
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struct acpi_pointer address;
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ACPI_FUNCTION_TRACE("acpi_load_table");
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if (!table_ptr) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/* Copy the table to a local buffer */
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address.pointer_type = ACPI_LOGICAL_POINTER | ACPI_LOGICAL_ADDRESSING;
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address.pointer.logical = table_ptr;
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status = acpi_tb_get_table_body(&address, table_ptr, &table_info);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Check signature for a valid table type */
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status = acpi_tb_recognize_table(&table_info, ACPI_TABLE_ALL);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Install the new table into the local data structures */
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status = acpi_tb_install_table(&table_info);
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if (ACPI_FAILURE(status)) {
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if (status == AE_ALREADY_EXISTS) {
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/* Table already exists, no error */
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status = AE_OK;
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}
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/* Free table allocated by acpi_tb_get_table_body */
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acpi_tb_delete_single_table(&table_info);
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return_ACPI_STATUS(status);
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}
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/* Convert the table to common format if necessary */
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switch (table_info.type) {
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case ACPI_TABLE_FADT:
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status = acpi_tb_convert_table_fadt();
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break;
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case ACPI_TABLE_FACS:
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status = acpi_tb_build_common_facs(&table_info);
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break;
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default:
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/* Load table into namespace if it contains executable AML */
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status =
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acpi_ns_load_table(table_info.installed_desc,
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acpi_gbl_root_node);
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break;
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}
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if (ACPI_FAILURE(status)) {
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/* Uninstall table and free the buffer */
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(void)acpi_tb_uninstall_table(table_info.installed_desc);
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}
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_unload_table
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*
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* PARAMETERS: table_type - Type of table to be unloaded
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*
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* RETURN: Status
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*
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* DESCRIPTION: This routine is used to force the unload of a table
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*
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******************************************************************************/
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acpi_status acpi_unload_table(acpi_table_type table_type)
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{
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struct acpi_table_desc *table_desc;
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ACPI_FUNCTION_TRACE("acpi_unload_table");
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/* Parameter validation */
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if (table_type > ACPI_TABLE_MAX) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/* Find all tables of the requested type */
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table_desc = acpi_gbl_table_lists[table_type].next;
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while (table_desc) {
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/*
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* Delete all namespace entries owned by this table. Note that these
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* entries can appear anywhere in the namespace by virtue of the AML
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* "Scope" operator. Thus, we need to track ownership by an ID, not
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* simply a position within the hierarchy
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*/
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acpi_ns_delete_namespace_by_owner(table_desc->owner_id);
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acpi_ut_release_owner_id(&table_desc->owner_id);
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table_desc = table_desc->next;
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}
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/* Delete (or unmap) all tables of this type */
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acpi_tb_delete_tables_by_type(table_type);
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_get_table_header
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*
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* PARAMETERS: table_type - one of the defined table types
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* Instance - the non zero instance of the table, allows
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* support for multiple tables of the same type
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* see acpi_gbl_acpi_table_flag
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* out_table_header - pointer to the struct acpi_table_header if successful
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*
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* DESCRIPTION: This function is called to get an ACPI table header. The caller
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* supplies an pointer to a data area sufficient to contain an ACPI
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* struct acpi_table_header structure.
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*
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* The header contains a length field that can be used to determine
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* the size of the buffer needed to contain the entire table. This
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* function is not valid for the RSD PTR table since it does not
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* have a standard header and is fixed length.
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*
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******************************************************************************/
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acpi_status
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acpi_get_table_header(acpi_table_type table_type,
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u32 instance, struct acpi_table_header *out_table_header)
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{
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struct acpi_table_header *tbl_ptr;
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acpi_status status;
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ACPI_FUNCTION_TRACE("acpi_get_table_header");
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if ((instance == 0) ||
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(table_type == ACPI_TABLE_RSDP) || (!out_table_header)) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/* Check the table type and instance */
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if ((table_type > ACPI_TABLE_MAX) ||
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(ACPI_IS_SINGLE_TABLE(acpi_gbl_table_data[table_type].flags) &&
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instance > 1)) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/* Get a pointer to the entire table */
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status = acpi_tb_get_table_ptr(table_type, instance, &tbl_ptr);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* The function will return a NULL pointer if the table is not loaded */
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if (tbl_ptr == NULL) {
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return_ACPI_STATUS(AE_NOT_EXIST);
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}
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/* Copy the header to the caller's buffer */
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ACPI_MEMCPY((void *)out_table_header, (void *)tbl_ptr,
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sizeof(struct acpi_table_header));
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return_ACPI_STATUS(status);
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}
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#endif /* ACPI_FUTURE_USAGE */
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/*******************************************************************************
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*
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* FUNCTION: acpi_get_table
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*
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* PARAMETERS: table_type - one of the defined table types
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* Instance - the non zero instance of the table, allows
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* support for multiple tables of the same type
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* see acpi_gbl_acpi_table_flag
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* ret_buffer - pointer to a structure containing a buffer to
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* receive the table
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*
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* RETURN: Status
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*
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* DESCRIPTION: This function is called to get an ACPI table. The caller
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* supplies an out_buffer large enough to contain the entire ACPI
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* table. The caller should call the acpi_get_table_header function
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* first to determine the buffer size needed. Upon completion
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* the out_buffer->Length field will indicate the number of bytes
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* copied into the out_buffer->buf_ptr buffer. This table will be
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* a complete table including the header.
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*
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******************************************************************************/
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acpi_status
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acpi_get_table(acpi_table_type table_type,
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u32 instance, struct acpi_buffer *ret_buffer)
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{
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struct acpi_table_header *tbl_ptr;
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acpi_status status;
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acpi_size table_length;
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ACPI_FUNCTION_TRACE("acpi_get_table");
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/* Parameter validation */
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if (instance == 0) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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status = acpi_ut_validate_buffer(ret_buffer);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Check the table type and instance */
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if ((table_type > ACPI_TABLE_MAX) ||
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(ACPI_IS_SINGLE_TABLE(acpi_gbl_table_data[table_type].flags) &&
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instance > 1)) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/* Get a pointer to the entire table */
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status = acpi_tb_get_table_ptr(table_type, instance, &tbl_ptr);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/*
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* acpi_tb_get_table_ptr will return a NULL pointer if the
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* table is not loaded.
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*/
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if (tbl_ptr == NULL) {
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return_ACPI_STATUS(AE_NOT_EXIST);
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}
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/* Get the table length */
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if (table_type == ACPI_TABLE_RSDP) {
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/* RSD PTR is the only "table" without a header */
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table_length = sizeof(struct rsdp_descriptor);
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} else {
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table_length = (acpi_size) tbl_ptr->length;
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}
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/* Validate/Allocate/Clear caller buffer */
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status = acpi_ut_initialize_buffer(ret_buffer, table_length);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Copy the table to the buffer */
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ACPI_MEMCPY((void *)ret_buffer->pointer, (void *)tbl_ptr, table_length);
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return_ACPI_STATUS(AE_OK);
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}
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EXPORT_SYMBOL(acpi_get_table);
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