/******************************************************************************
*
* Module Name: tbxfload - Table load/unload external interfaces
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2012, 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.
*/
#include <linux/export.h>
#include <acpi/acpi.h>
#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);
static int no_auto_ssdt;
/*******************************************************************************
*
* FUNCTION: acpi_load_tables
*
* PARAMETERS: None
*
* RETURN: Status
*
* DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
*
******************************************************************************/
acpi_status 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(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_verify_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_verify_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_verify_table
(&acpi_gbl_root_table_list.tables[i]))) {
continue;
}
if (no_auto_ssdt) {
printk(KERN_WARNING "ACPI: SSDT ignored due to \"acpi_no_auto_ssdt\"\n");
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_DEBUG_PRINT((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));
unlock_and_exit:
(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* 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;
struct acpi_table_desc table_desc;
u32 table_index;
ACPI_FUNCTION_TRACE(acpi_load_table);
/* Parameter validation */
if (!table) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/* Init local table descriptor */
ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc));
table_desc.address = ACPI_PTR_TO_PHYSADDR(table);
table_desc.pointer = table;
table_desc.length = table->length;
table_desc.flags = ACPI_TABLE_ORIGIN_UNKNOWN;
/* 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:"));
status = acpi_tb_add_table(&table_desc, &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)
static int __init acpi_no_auto_ssdt_setup(char *s) {
printk(KERN_NOTICE "ACPI: SSDT auto-load disabled\n");
no_auto_ssdt = 1;
return 1;
}
__setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup);
