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linux/drivers/acpi/acpica/tbxface.c

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/******************************************************************************
*
* Module Name: tbxface - Public interfaces to the ACPI subsystem
* ACPI table oriented interfaces
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2011, 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 <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"
#include "actables.h"
#define _COMPONENT ACPI_TABLES
ACPI_MODULE_NAME("tbxface")
/* Local prototypes */
static acpi_status acpi_tb_load_namespace(void);
static int no_auto_ssdt;
/*******************************************************************************
*
* FUNCTION: acpi_allocate_root_table
*
* PARAMETERS: initial_table_count - Size of initial_table_array, in number of
* struct acpi_table_desc structures
*
* RETURN: Status
*
* DESCRIPTION: Allocate a root table array. Used by i_aSL compiler and
* acpi_initialize_tables.
*
******************************************************************************/
acpi_status acpi_allocate_root_table(u32 initial_table_count)
{
acpi_gbl_root_table_list.max_table_count = initial_table_count;
acpi_gbl_root_table_list.flags = ACPI_ROOT_ALLOW_RESIZE;
return (acpi_tb_resize_root_table_list());
}
/*******************************************************************************
*
* FUNCTION: acpi_initialize_tables
*
* PARAMETERS: initial_table_array - Pointer to an array of pre-allocated
* struct acpi_table_desc structures. If NULL, the
* array is dynamically allocated.
* initial_table_count - Size of initial_table_array, in number of
* struct acpi_table_desc structures
* allow_realloc - Flag to tell Table Manager if resize of
* pre-allocated array is allowed. Ignored
* if initial_table_array is NULL.
*
* RETURN: Status
*
* DESCRIPTION: Initialize the table manager, get the RSDP and RSDT/XSDT.
*
* NOTE: Allows static allocation of the initial table array in order
* to avoid the use of dynamic memory in confined environments
* such as the kernel boot sequence where it may not be available.
*
* If the host OS memory managers are initialized, use NULL for
* initial_table_array, and the table will be dynamically allocated.
*
******************************************************************************/
acpi_status __init
acpi_initialize_tables(struct acpi_table_desc * initial_table_array,
u32 initial_table_count, u8 allow_resize)
{
acpi_physical_address rsdp_address;
acpi_status status;
ACPI_FUNCTION_TRACE(acpi_initialize_tables);
/*
* Set up the Root Table Array
* Allocate the table array if requested
*/
if (!initial_table_array) {
status = acpi_allocate_root_table(initial_table_count);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
} else {
/* Root Table Array has been statically allocated by the host */
ACPI_MEMSET(initial_table_array, 0,
(acpi_size) initial_table_count *
sizeof(struct acpi_table_desc));
acpi_gbl_root_table_list.tables = initial_table_array;
acpi_gbl_root_table_list.max_table_count = initial_table_count;
acpi_gbl_root_table_list.flags = ACPI_ROOT_ORIGIN_UNKNOWN;
if (allow_resize) {
acpi_gbl_root_table_list.flags |=
ACPI_ROOT_ALLOW_RESIZE;
}
}
/* Get the address of the RSDP */
rsdp_address = acpi_os_get_root_pointer();
if (!rsdp_address) {
return_ACPI_STATUS(AE_NOT_FOUND);
}
/*
* Get the root table (RSDT or XSDT) and extract all entries to the local
* Root Table Array. This array contains the information of the RSDT/XSDT
* in a common, more useable format.
*/
status = acpi_tb_parse_root_table(rsdp_address);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_reallocate_root_table
*
* PARAMETERS: None
*
* RETURN: Status
*
* DESCRIPTION: Reallocate Root Table List into dynamic memory. Copies the
* root list from the previously provided scratch area. Should
* be called once dynamic memory allocation is available in the
* kernel
*
******************************************************************************/
acpi_status acpi_reallocate_root_table(void)
{
struct acpi_table_desc *tables;
acpi_size new_size;
acpi_size current_size;
ACPI_FUNCTION_TRACE(acpi_reallocate_root_table);
/*
* Only reallocate the root table if the host provided a static buffer
* for the table array in the call to acpi_initialize_tables.
*/
if (acpi_gbl_root_table_list.flags & ACPI_ROOT_ORIGIN_ALLOCATED) {
return_ACPI_STATUS(AE_SUPPORT);
}
/*
* Get the current size of the root table and add the default
* increment to create the new table size.
*/
current_size = (acpi_size)
acpi_gbl_root_table_list.current_table_count *
sizeof(struct acpi_table_desc);
new_size = current_size +
(ACPI_ROOT_TABLE_SIZE_INCREMENT * sizeof(struct acpi_table_desc));
/* Create new array and copy the old array */
tables = ACPI_ALLOCATE_ZEROED(new_size);
if (!tables) {
return_ACPI_STATUS(AE_NO_MEMORY);
}
ACPI_MEMCPY(tables, acpi_gbl_root_table_list.tables, current_size);
/*
* Update the root table descriptor. The new size will be the current
* number of tables plus the increment, independent of the reserved
* size of the original table list.
*/
acpi_gbl_root_table_list.tables = tables;
acpi_gbl_root_table_list.max_table_count =
acpi_gbl_root_table_list.current_table_count +
ACPI_ROOT_TABLE_SIZE_INCREMENT;
acpi_gbl_root_table_list.flags =
ACPI_ROOT_ORIGIN_ALLOCATED | ACPI_ROOT_ALLOW_RESIZE;
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_load_table
*
* PARAMETERS: table_ptr - pointer to a buffer containing the entire
* table to be loaded
*
* RETURN: Status
*
* DESCRIPTION: This function is called to load a table from the caller's
* buffer. The buffer must contain an entire ACPI Table including
* a valid header. The header fields will be verified, and if it
* is determined that the table is invalid, the call will fail.
*
******************************************************************************/
acpi_status acpi_load_table(struct acpi_table_header *table_ptr)
{
acpi_status status;
u32 table_index;
struct acpi_table_desc table_desc;
if (!table_ptr)
return AE_BAD_PARAMETER;
ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc));
table_desc.pointer = table_ptr;
table_desc.length = table_ptr->length;
table_desc.flags = ACPI_TABLE_ORIGIN_UNKNOWN;
/*
* Install the new table into the local data structures
*/
status = acpi_tb_add_table(&table_desc, &table_index);
if (ACPI_FAILURE(status)) {
return status;
}
status = acpi_ns_load_table(table_index, acpi_gbl_root_node);
return status;
}
ACPI_EXPORT_SYMBOL(acpi_load_table)
/*******************************************************************************
*
* FUNCTION: acpi_get_table_header
*
* PARAMETERS: Signature - ACPI signature of needed table
* Instance - Which instance (for SSDTs)
* out_table_header - The pointer to the table header to fill
*
* RETURN: Status and pointer to mapped table header
*
* DESCRIPTION: Finds an ACPI table header.
*
* NOTE: Caller is responsible in unmapping the header with
* acpi_os_unmap_memory
*
******************************************************************************/
acpi_status
acpi_get_table_header(char *signature,
u32 instance, struct acpi_table_header *out_table_header)
{
u32 i;
u32 j;
struct acpi_table_header *header;
/* Parameter validation */
if (!signature || !out_table_header) {
return (AE_BAD_PARAMETER);
}
/* Walk the root table list */
for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
i++) {
if (!ACPI_COMPARE_NAME
(&(acpi_gbl_root_table_list.tables[i].signature),
signature)) {
continue;
}
if (++j < instance) {
continue;
}
if (!acpi_gbl_root_table_list.tables[i].pointer) {
if ((acpi_gbl_root_table_list.tables[i].flags &
ACPI_TABLE_ORIGIN_MASK) ==
ACPI_TABLE_ORIGIN_MAPPED) {
header =
acpi_os_map_memory(acpi_gbl_root_table_list.
tables[i].address,
sizeof(struct
acpi_table_header));
if (!header) {
return AE_NO_MEMORY;
}
ACPI_MEMCPY(out_table_header, header,
sizeof(struct acpi_table_header));
acpi_os_unmap_memory(header,
sizeof(struct
acpi_table_header));
} else {
return AE_NOT_FOUND;
}
} else {
ACPI_MEMCPY(out_table_header,
acpi_gbl_root_table_list.tables[i].pointer,
sizeof(struct acpi_table_header));
}
return (AE_OK);
}
return (AE_NOT_FOUND);
}
ACPI_EXPORT_SYMBOL(acpi_get_table_header)
/*******************************************************************************
*
* FUNCTION: acpi_unload_table_id
*
* PARAMETERS: id - Owner ID of the table to be removed.
*
* RETURN: Status
*
* DESCRIPTION: This routine is used to force the unload of a table (by id)
*
******************************************************************************/
acpi_status acpi_unload_table_id(acpi_owner_id id)
{
int i;
acpi_status status = AE_NOT_EXIST;
ACPI_FUNCTION_TRACE(acpi_unload_table_id);
/* Find table in the global table list */
for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
if (id != acpi_gbl_root_table_list.tables[i].owner_id) {
continue;
}
/*
* 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
*/
acpi_tb_delete_namespace_by_owner(i);
status = acpi_tb_release_owner_id(i);
acpi_tb_set_table_loaded_flag(i, FALSE);
break;
}
return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_unload_table_id)
/*******************************************************************************
*
* FUNCTION: acpi_get_table_with_size
*
* PARAMETERS: Signature - ACPI signature of needed table
* Instance - Which instance (for SSDTs)
* out_table - Where the pointer to the table is returned
*
* RETURN: Status and pointer to table
*
* DESCRIPTION: Finds and verifies an ACPI table.
*
******************************************************************************/
acpi_status
acpi_get_table_with_size(char *signature,
u32 instance, struct acpi_table_header **out_table,
acpi_size *tbl_size)
{
u32 i;
u32 j;
acpi_status status;
/* Parameter validation */
if (!signature || !out_table) {
return (AE_BAD_PARAMETER);
}
/* Walk the root table list */
for (i = 0, j = 0; i < acpi_gbl_root_table_list.current_table_count;
i++) {
if (!ACPI_COMPARE_NAME
(&(acpi_gbl_root_table_list.tables[i].signature),
signature)) {
continue;
}
if (++j < instance) {
continue;
}
status =
acpi_tb_verify_table(&acpi_gbl_root_table_list.tables[i]);
if (ACPI_SUCCESS(status)) {
*out_table = acpi_gbl_root_table_list.tables[i].pointer;
*tbl_size = acpi_gbl_root_table_list.tables[i].length;
}
if (!acpi_gbl_permanent_mmap) {
acpi_gbl_root_table_list.tables[i].pointer = NULL;
}
return (status);
}
return (AE_NOT_FOUND);
}
acpi_status
acpi_get_table(char *signature,
u32 instance, struct acpi_table_header **out_table)
{
acpi_size tbl_size;
return acpi_get_table_with_size(signature,
instance, out_table, &tbl_size);
}
ACPI_EXPORT_SYMBOL(acpi_get_table)
/*******************************************************************************
*
* FUNCTION: acpi_get_table_by_index
*
* PARAMETERS: table_index - Table index
* Table - Where the pointer to the table is returned
*
* RETURN: Status and pointer to the table
*
* DESCRIPTION: Obtain a table by an index into the global table list.
*
******************************************************************************/
acpi_status
acpi_get_table_by_index(u32 table_index, struct acpi_table_header **table)
{
acpi_status status;
ACPI_FUNCTION_TRACE(acpi_get_table_by_index);
/* Parameter validation */
if (!table) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
(void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
/* Validate index */
if (table_index >= acpi_gbl_root_table_list.current_table_count) {
(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
if (!acpi_gbl_root_table_list.tables[table_index].pointer) {
/* Table is not mapped, map it */
status =
acpi_tb_verify_table(&acpi_gbl_root_table_list.
tables[table_index]);
if (ACPI_FAILURE(status)) {
(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
return_ACPI_STATUS(status);
}
}
*table = acpi_gbl_root_table_list.tables[table_index].pointer;
(void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
return_ACPI_STATUS(AE_OK);
}
ACPI_EXPORT_SYMBOL(acpi_get_table_by_index)
/*******************************************************************************
*
* 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_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_install_table_handler
*
* PARAMETERS: Handler - Table event handler
* Context - Value passed to the handler on each event
*
* RETURN: Status
*
* DESCRIPTION: Install table event handler
*
******************************************************************************/
acpi_status
acpi_install_table_handler(acpi_tbl_handler handler, void *context)
{
acpi_status status;
ACPI_FUNCTION_TRACE(acpi_install_table_handler);
if (!handler) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Don't allow more than one handler */
if (acpi_gbl_table_handler) {
status = AE_ALREADY_EXISTS;
goto cleanup;
}
/* Install the handler */
acpi_gbl_table_handler = handler;
acpi_gbl_table_handler_context = context;
cleanup:
(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_install_table_handler)
/*******************************************************************************
*
* FUNCTION: acpi_remove_table_handler
*
* PARAMETERS: Handler - Table event handler that was installed
* previously.
*
* RETURN: Status
*
* DESCRIPTION: Remove table event handler
*
******************************************************************************/
acpi_status acpi_remove_table_handler(acpi_tbl_handler handler)
{
acpi_status status;
ACPI_FUNCTION_TRACE(acpi_remove_table_handler);
status = acpi_ut_acquire_mutex(ACPI_MTX_EVENTS);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Make sure that the installed handler is the same */
if (!handler || handler != acpi_gbl_table_handler) {
status = AE_BAD_PARAMETER;
goto cleanup;
}
/* Remove the handler */
acpi_gbl_table_handler = NULL;
cleanup:
(void)acpi_ut_release_mutex(ACPI_MTX_EVENTS);
return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_remove_table_handler)
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);
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