390 lines
12 KiB
C
390 lines
12 KiB
C
/******************************************************************************
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*
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* Module Name: tbxfload - Table load/unload external interfaces
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2012, Intel Corp.
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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/export.h>
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "acnamesp.h"
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#include "actables.h"
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#define _COMPONENT ACPI_TABLES
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ACPI_MODULE_NAME("tbxfload")
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/* Local prototypes */
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static acpi_status acpi_tb_load_namespace(void);
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static int no_auto_ssdt;
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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: Load the ACPI tables from the RSDT/XSDT
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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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acpi_status status;
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ACPI_FUNCTION_TRACE(acpi_load_tables);
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/* Load the namespace from the tables */
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status = acpi_tb_load_namespace();
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status,
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"While loading namespace from ACPI tables"));
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}
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return_ACPI_STATUS(status);
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}
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ACPI_EXPORT_SYMBOL(acpi_load_tables)
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_load_namespace
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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: Load the namespace from the DSDT and all SSDTs/PSDTs found in
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* the RSDT/XSDT.
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*
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******************************************************************************/
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static acpi_status acpi_tb_load_namespace(void)
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{
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acpi_status status;
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u32 i;
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struct acpi_table_header *new_dsdt;
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ACPI_FUNCTION_TRACE(tb_load_namespace);
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(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
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/*
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* Load the namespace. The DSDT is required, but any SSDT and
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* PSDT tables are optional. Verify the DSDT.
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*/
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if (!acpi_gbl_root_table_list.current_table_count ||
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!ACPI_COMPARE_NAME(&
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(acpi_gbl_root_table_list.
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tables[ACPI_TABLE_INDEX_DSDT].signature),
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ACPI_SIG_DSDT)
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||
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ACPI_FAILURE(acpi_tb_verify_table
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(&acpi_gbl_root_table_list.
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tables[ACPI_TABLE_INDEX_DSDT]))) {
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status = AE_NO_ACPI_TABLES;
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goto unlock_and_exit;
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}
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/*
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* Save the DSDT pointer for simple access. This is the mapped memory
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* address. We must take care here because the address of the .Tables
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* array can change dynamically as tables are loaded at run-time. Note:
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* .Pointer field is not validated until after call to acpi_tb_verify_table.
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*/
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acpi_gbl_DSDT =
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acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].pointer;
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/*
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* Optionally copy the entire DSDT to local memory (instead of simply
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* mapping it.) There are some BIOSs that corrupt or replace the original
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* DSDT, creating the need for this option. Default is FALSE, do not copy
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* the DSDT.
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*/
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if (acpi_gbl_copy_dsdt_locally) {
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new_dsdt = acpi_tb_copy_dsdt(ACPI_TABLE_INDEX_DSDT);
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if (new_dsdt) {
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acpi_gbl_DSDT = new_dsdt;
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}
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}
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/*
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* Save the original DSDT header for detection of table corruption
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* and/or replacement of the DSDT from outside the OS.
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*/
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ACPI_MEMCPY(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT,
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sizeof(struct acpi_table_header));
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(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
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/* Load and parse tables */
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status = acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT, acpi_gbl_root_node);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */
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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 ((!ACPI_COMPARE_NAME
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(&(acpi_gbl_root_table_list.tables[i].signature),
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ACPI_SIG_SSDT)
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&&
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!ACPI_COMPARE_NAME(&
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(acpi_gbl_root_table_list.tables[i].
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signature), ACPI_SIG_PSDT))
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||
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ACPI_FAILURE(acpi_tb_verify_table
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(&acpi_gbl_root_table_list.tables[i]))) {
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continue;
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}
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if (no_auto_ssdt) {
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printk(KERN_WARNING "ACPI: SSDT ignored due to \"acpi_no_auto_ssdt\"\n");
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continue;
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}
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/* Ignore errors while loading tables, get as many as possible */
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(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
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(void)acpi_ns_load_table(i, acpi_gbl_root_node);
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(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
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}
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ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));
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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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/*******************************************************************************
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*
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* FUNCTION: acpi_load_table
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*
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* PARAMETERS: table - Pointer to a buffer containing the ACPI
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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: Dynamically load an ACPI table from the caller's buffer. Must
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* be a valid ACPI table with a valid ACPI table header.
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* Note1: Mainly intended to support hotplug addition of SSDTs.
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* Note2: Does not copy the incoming table. User is reponsible
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* to ensure that the table is not deleted or unmapped.
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*
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******************************************************************************/
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acpi_status acpi_load_table(struct acpi_table_header *table)
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{
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acpi_status status;
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struct acpi_table_desc table_desc;
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u32 table_index;
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ACPI_FUNCTION_TRACE(acpi_load_table);
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/* Parameter validation */
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if (!table) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/* Init local table descriptor */
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ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc));
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table_desc.address = ACPI_PTR_TO_PHYSADDR(table);
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table_desc.pointer = table;
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table_desc.length = table->length;
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table_desc.flags = ACPI_TABLE_ORIGIN_UNKNOWN;
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/* Must acquire the interpreter lock during this operation */
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status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
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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 table and load it into the namespace */
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ACPI_INFO((AE_INFO, "Host-directed Dynamic ACPI Table Load:"));
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status = acpi_tb_add_table(&table_desc, &table_index);
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if (ACPI_FAILURE(status)) {
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goto unlock_and_exit;
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}
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status = acpi_ns_load_table(table_index, acpi_gbl_root_node);
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/* Invoke table handler if present */
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if (acpi_gbl_table_handler) {
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(void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
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acpi_gbl_table_handler_context);
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}
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unlock_and_exit:
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(void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
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return_ACPI_STATUS(status);
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}
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ACPI_EXPORT_SYMBOL(acpi_load_table)
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/*******************************************************************************
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*
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* FUNCTION: acpi_unload_parent_table
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*
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* PARAMETERS: object - Handle to any namespace object owned by
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* the table to be unloaded
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*
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* RETURN: Status
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*
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* DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads
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* the table and deletes all namespace objects associated with
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* that table. Unloading of the DSDT is not allowed.
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* Note: Mainly intended to support hotplug removal of SSDTs.
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*
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******************************************************************************/
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acpi_status acpi_unload_parent_table(acpi_handle object)
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{
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struct acpi_namespace_node *node =
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ACPI_CAST_PTR(struct acpi_namespace_node, object);
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acpi_status status = AE_NOT_EXIST;
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acpi_owner_id owner_id;
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u32 i;
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ACPI_FUNCTION_TRACE(acpi_unload_parent_table);
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/* Parameter validation */
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if (!object) {
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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/*
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* The node owner_id is currently the same as the parent table ID.
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* However, this could change in the future.
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*/
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owner_id = node->owner_id;
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if (!owner_id) {
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/* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */
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return_ACPI_STATUS(AE_TYPE);
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}
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/* Must acquire the interpreter lock during this operation */
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status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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/* Find the table in the global table list */
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for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
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if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) {
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continue;
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}
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/*
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* Allow unload of SSDT and OEMx tables only. Do not allow unload
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* of the DSDT. No other types of tables should get here, since
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* only these types can contain AML and thus are the only types
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* that can create namespace objects.
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*/
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if (ACPI_COMPARE_NAME
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(acpi_gbl_root_table_list.tables[i].signature.ascii,
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ACPI_SIG_DSDT)) {
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status = AE_TYPE;
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break;
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}
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/* Ensure the table is actually loaded */
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if (!acpi_tb_is_table_loaded(i)) {
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status = AE_NOT_EXIST;
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break;
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}
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/* Invoke table handler if present */
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if (acpi_gbl_table_handler) {
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(void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD,
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acpi_gbl_root_table_list.
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tables[i].pointer,
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acpi_gbl_table_handler_context);
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}
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/*
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* Delete all namespace objects owned by this table. Note that
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* these objects can appear anywhere in the namespace by virtue
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* of the AML "Scope" operator. Thus, we need to track ownership
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* by an ID, not simply a position within the hierarchy.
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*/
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status = acpi_tb_delete_namespace_by_owner(i);
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if (ACPI_FAILURE(status)) {
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break;
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}
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status = acpi_tb_release_owner_id(i);
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acpi_tb_set_table_loaded_flag(i, FALSE);
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break;
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}
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(void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
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return_ACPI_STATUS(status);
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}
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ACPI_EXPORT_SYMBOL(acpi_unload_parent_table)
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static int __init acpi_no_auto_ssdt_setup(char *s) {
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printk(KERN_NOTICE "ACPI: SSDT auto-load disabled\n");
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no_auto_ssdt = 1;
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return 1;
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}
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__setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup);
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