tbinstal.c
/******************************************************************************
*
* Module Name: tbinstal - ACPI table installation and removal
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2006, R. Byron Moore
* 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 <acpi/acpi.h>
#include <acpi/actables.h>
#define _COMPONENT ACPI_TABLES
ACPI_MODULE_NAME("tbinstal")
/* Local prototypes */
static acpi_status
acpi_tb_match_signature(char *signature,
struct acpi_table_desc *table_info, u8 search_type);
/*******************************************************************************
*
* FUNCTION: acpi_tb_match_signature
*
* PARAMETERS: Signature - Table signature to match
* table_info - Return data
* search_type - Table type to match (primary/secondary)
*
* RETURN: Status
*
* DESCRIPTION: Compare signature against the list of "ACPI-subsystem-owned"
* tables (DSDT/FADT/SSDT, etc.) Returns the table_type_iD on match.
*
******************************************************************************/
static acpi_status
acpi_tb_match_signature(char *signature,
struct acpi_table_desc *table_info, u8 search_type)
{
acpi_native_uint i;
ACPI_FUNCTION_TRACE("tb_match_signature");
/* Search for a signature match among the known table types */
for (i = 0; i < NUM_ACPI_TABLE_TYPES; i++) {
if (!(acpi_gbl_table_data[i].flags & search_type)) {
continue;
}
if (!ACPI_STRNCMP(signature, acpi_gbl_table_data[i].signature,
acpi_gbl_table_data[i].sig_length)) {
/* Found a signature match, return index if requested */
if (table_info) {
table_info->type = (u8) i;
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Table [%4.4s] is an ACPI table consumed by the core subsystem\n",
(char *)acpi_gbl_table_data[i].
signature));
return_ACPI_STATUS(AE_OK);
}
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Table [%4.4s] is not an ACPI table consumed by the core subsystem - ignored\n",
(char *)signature));
return_ACPI_STATUS(AE_TABLE_NOT_SUPPORTED);
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_install_table
*
* PARAMETERS: table_info - Return value from acpi_tb_get_table_body
*
* RETURN: Status
*
* DESCRIPTION: Install the table into the global data structures.
*
******************************************************************************/
acpi_status acpi_tb_install_table(struct acpi_table_desc *table_info)
{
acpi_status status;
ACPI_FUNCTION_TRACE("tb_install_table");
/* Lock tables while installing */
status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status,
"Could not acquire table mutex"));
return_ACPI_STATUS(status);
}
/*
* Ignore a table that is already installed. For example, some BIOS
* ASL code will repeatedly attempt to load the same SSDT.
*/
status = acpi_tb_is_table_installed(table_info);
if (ACPI_FAILURE(status)) {
goto unlock_and_exit;
}
/* Install the table into the global data structure */
status = acpi_tb_init_table_descriptor(table_info->type, table_info);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status,
"Could not install table [%4.4s]",
table_info->pointer->signature));
}
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "%s located at %p\n",
acpi_gbl_table_data[table_info->type].name,
table_info->pointer));
unlock_and_exit:
(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_recognize_table
*
* PARAMETERS: table_info - Return value from acpi_tb_get_table_body
* search_type - Table type to match (primary/secondary)
*
* RETURN: Status
*
* DESCRIPTION: Check a table signature for a match against known table types
*
* NOTE: All table pointers are validated as follows:
* 1) Table pointer must point to valid physical memory
* 2) Signature must be 4 ASCII chars, even if we don't recognize the
* name
* 3) Table must be readable for length specified in the header
* 4) Table checksum must be valid (with the exception of the FACS
* which has no checksum for some odd reason)
*
******************************************************************************/
acpi_status
acpi_tb_recognize_table(struct acpi_table_desc *table_info, u8 search_type)
{
struct acpi_table_header *table_header;
acpi_status status;
ACPI_FUNCTION_TRACE("tb_recognize_table");
/* Ensure that we have a valid table pointer */
table_header = (struct acpi_table_header *)table_info->pointer;
if (!table_header) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/*
* We only "recognize" a limited number of ACPI tables -- namely, the
* ones that are used by the subsystem (DSDT, FADT, etc.)
*
* An AE_TABLE_NOT_SUPPORTED means that the table was not recognized.
* This can be any one of many valid ACPI tables, it just isn't one of
* the tables that is consumed by the core subsystem
*/
status = acpi_tb_match_signature(table_header->signature,
table_info, search_type);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
status = acpi_tb_validate_table_header(table_header);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Return the table type and length via the info struct */
table_info->length = (acpi_size) table_header->length;
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_init_table_descriptor
*
* PARAMETERS: table_type - The type of the table
* table_info - A table info struct
*
* RETURN: None.
*
* DESCRIPTION: Install a table into the global data structs.
*
******************************************************************************/
acpi_status
acpi_tb_init_table_descriptor(acpi_table_type table_type,
struct acpi_table_desc *table_info)
{
struct acpi_table_list *list_head;
struct acpi_table_desc *table_desc;
acpi_status status;
ACPI_FUNCTION_TRACE_U32("tb_init_table_descriptor", table_type);
/* Allocate a descriptor for this table */
table_desc = ACPI_MEM_CALLOCATE(sizeof(struct acpi_table_desc));
if (!table_desc) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
/* Get a new owner ID for the table */
status = acpi_ut_allocate_owner_id(&table_desc->owner_id);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Install the table into the global data structure */
list_head = &acpi_gbl_table_lists[table_type];
/*
* Two major types of tables: 1) Only one instance is allowed. This
* includes most ACPI tables such as the DSDT. 2) Multiple instances of
* the table are allowed. This includes SSDT and PSDTs.
*/
if (ACPI_IS_SINGLE_TABLE(acpi_gbl_table_data[table_type].flags)) {
/*
* Only one table allowed, and a table has alread been installed
* at this location, so return an error.
*/
if (list_head->next) {
ACPI_MEM_FREE(table_desc);
return_ACPI_STATUS(AE_ALREADY_EXISTS);
}
table_desc->next = list_head->next;
list_head->next = table_desc;
if (table_desc->next) {
table_desc->next->prev = table_desc;
}
list_head->count++;
} else {
/*
* Link the new table in to the list of tables of this type.
* Insert at the end of the list, order IS IMPORTANT.
*
* table_desc->Prev & Next are already NULL from calloc()
*/
list_head->count++;
if (!list_head->next) {
list_head->next = table_desc;
} else {
table_desc->next = list_head->next;
while (table_desc->next->next) {
table_desc->next = table_desc->next->next;
}
table_desc->next->next = table_desc;
table_desc->prev = table_desc->next;
table_desc->next = NULL;
}
}
/* Finish initialization of the table descriptor */
table_desc->type = (u8) table_type;
table_desc->pointer = table_info->pointer;
table_desc->length = table_info->length;
table_desc->allocation = table_info->allocation;
table_desc->aml_start = (u8 *) (table_desc->pointer + 1),
table_desc->aml_length = (u32) (table_desc->length -
(u32) sizeof(struct
acpi_table_header));
table_desc->loaded_into_namespace = FALSE;
/*
* Set the appropriate global pointer (if there is one) to point to the
* newly installed table
*/
if (acpi_gbl_table_data[table_type].global_ptr) {
*(acpi_gbl_table_data[table_type].global_ptr) =
table_info->pointer;
}
/* Return Data */
table_info->owner_id = table_desc->owner_id;
table_info->installed_desc = table_desc;
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_delete_all_tables
*
* PARAMETERS: None.
*
* RETURN: None.
*
* DESCRIPTION: Delete all internal ACPI tables
*
******************************************************************************/
void acpi_tb_delete_all_tables(void)
{
acpi_table_type type;
/*
* Free memory allocated for ACPI tables
* Memory can either be mapped or allocated
*/
for (type = 0; type < NUM_ACPI_TABLE_TYPES; type++) {
acpi_tb_delete_tables_by_type(type);
}
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_delete_tables_by_type
*
* PARAMETERS: Type - The table type to be deleted
*
* RETURN: None.
*
* DESCRIPTION: Delete an internal ACPI table
* Locks the ACPI table mutex
*
******************************************************************************/
void acpi_tb_delete_tables_by_type(acpi_table_type type)
{
struct acpi_table_desc *table_desc;
u32 count;
u32 i;
ACPI_FUNCTION_TRACE_U32("tb_delete_tables_by_type", type);
if (type > ACPI_TABLE_MAX) {
return_VOID;
}
if (ACPI_FAILURE(acpi_ut_acquire_mutex(ACPI_MTX_TABLES))) {
return;
}
/* Clear the appropriate "typed" global table pointer */
switch (type) {
case ACPI_TABLE_RSDP:
acpi_gbl_RSDP = NULL;
break;
case ACPI_TABLE_DSDT:
acpi_gbl_DSDT = NULL;
break;
case ACPI_TABLE_FADT:
acpi_gbl_FADT = NULL;
break;
case ACPI_TABLE_FACS:
acpi_gbl_FACS = NULL;
break;
case ACPI_TABLE_XSDT:
acpi_gbl_XSDT = NULL;
break;
case ACPI_TABLE_SSDT:
case ACPI_TABLE_PSDT:
default:
break;
}
/*
* Free the table
* 1) Get the head of the list
*/
table_desc = acpi_gbl_table_lists[type].next;
count = acpi_gbl_table_lists[type].count;
/*
* 2) Walk the entire list, deleting both the allocated tables
* and the table descriptors
*/
for (i = 0; i < count; i++) {
table_desc = acpi_tb_uninstall_table(table_desc);
}
(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_delete_single_table
*
* PARAMETERS: table_info - A table info struct
*
* RETURN: None.
*
* DESCRIPTION: Low-level free for a single ACPI table. Handles cases where
* the table was allocated a buffer or was mapped.
*
******************************************************************************/
void acpi_tb_delete_single_table(struct acpi_table_desc *table_desc)
{
/* Must have a valid table descriptor and pointer */
if ((!table_desc) || (!table_desc->pointer)) {
return;
}
/* Valid table, determine type of memory allocation */
switch (table_desc->allocation) {
case ACPI_MEM_NOT_ALLOCATED:
break;
case ACPI_MEM_ALLOCATED:
ACPI_MEM_FREE(table_desc->pointer);
break;
case ACPI_MEM_MAPPED:
acpi_os_unmap_memory(table_desc->pointer, table_desc->length);
break;
default:
break;
}
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_uninstall_table
*
* PARAMETERS: table_info - A table info struct
*
* RETURN: Pointer to the next table in the list (of same type)
*
* DESCRIPTION: Free the memory associated with an internal ACPI table that
* is either installed or has never been installed.
* Table mutex should be locked.
*
******************************************************************************/
struct acpi_table_desc *acpi_tb_uninstall_table(struct acpi_table_desc
*table_desc)
{
struct acpi_table_desc *next_desc;
ACPI_FUNCTION_TRACE_PTR("tb_uninstall_table", table_desc);
if (!table_desc) {
return_PTR(NULL);
}
/* Unlink the descriptor from the doubly linked list */
if (table_desc->prev) {
table_desc->prev->next = table_desc->next;
} else {
/* Is first on list, update list head */
acpi_gbl_table_lists[table_desc->type].next = table_desc->next;
}
if (table_desc->next) {
table_desc->next->prev = table_desc->prev;
}
/* Free the memory allocated for the table itself */
acpi_tb_delete_single_table(table_desc);
/* Free the table descriptor */
next_desc = table_desc->next;
ACPI_MEM_FREE(table_desc);
/* Return pointer to the next descriptor */
return_PTR(next_desc);
}
