Quelle tbxfload.c
Sprache: C
// 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)
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(vorverarbeitet am 2026-09-29)
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2026-10-10
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