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linux/drivers/acpi/tables/tbxface.c

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/******************************************************************************
*
* Module Name: tbxface - Public interfaces to the ACPI subsystem
* ACPI table oriented interfaces
*
*****************************************************************************/
/*
* 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/acnamesp.h>
#include <acpi/actables.h>
#define _COMPONENT ACPI_TABLES
ACPI_MODULE_NAME("tbxface")
/*******************************************************************************
*
* FUNCTION: acpi_load_tables
*
* PARAMETERS: None
*
* RETURN: Status
*
* DESCRIPTION: This function is called to load the ACPI tables from the
* provided RSDT
*
******************************************************************************/
acpi_status acpi_load_tables(void)
{
struct acpi_pointer rsdp_address;
acpi_status status;
ACPI_FUNCTION_TRACE(acpi_load_tables);
/* Get the RSDP */
status = acpi_os_get_root_pointer(ACPI_LOGICAL_ADDRESSING,
&rsdp_address);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Could not get the RSDP"));
goto error_exit;
}
/* Map and validate the RSDP */
acpi_gbl_table_flags = rsdp_address.pointer_type;
status = acpi_tb_verify_rsdp(&rsdp_address);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "During RSDP validation"));
goto error_exit;
}
/* Get the RSDT via the RSDP */
status = acpi_tb_get_table_rsdt();
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Could not load RSDT"));
goto error_exit;
}
/* Now get the tables needed by this subsystem (FADT, DSDT, etc.) */
status = acpi_tb_get_required_tables();
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status,
"Could not get all required tables (DSDT/FADT/FACS)"));
goto error_exit;
}
ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));
/* Load the namespace from the tables */
status = acpi_ns_load_namespace();
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Could not load namespace"));
goto error_exit;
}
return_ACPI_STATUS(AE_OK);
error_exit:
ACPI_EXCEPTION((AE_INFO, status, "Could not load tables"));
return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_load_tables)
#ifdef ACPI_FUTURE_USAGE
/*******************************************************************************
*
* 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;
struct acpi_table_desc table_info;
struct acpi_pointer address;
ACPI_FUNCTION_TRACE(acpi_load_table);
if (!table_ptr) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/* Copy the table to a local buffer */
address.pointer_type = ACPI_LOGICAL_POINTER | ACPI_LOGICAL_ADDRESSING;
address.pointer.logical = table_ptr;
status = acpi_tb_get_table_body(&address, table_ptr, &table_info);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Check signature for a valid table type */
status = acpi_tb_recognize_table(&table_info, ACPI_TABLE_ALL);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Install the new table into the local data structures */
status = acpi_tb_install_table(&table_info);
if (ACPI_FAILURE(status)) {
if (status == AE_ALREADY_EXISTS) {
/* Table already exists, no error */
status = AE_OK;
}
/* Free table allocated by acpi_tb_get_table_body */
acpi_tb_delete_single_table(&table_info);
return_ACPI_STATUS(status);
}
/* Convert the table to common format if necessary */
switch (table_info.type) {
case ACPI_TABLE_ID_FADT:
status = acpi_tb_convert_table_fadt();
break;
case ACPI_TABLE_ID_FACS:
status = acpi_tb_build_common_facs(&table_info);
break;
default:
/* Load table into namespace if it contains executable AML */
status =
acpi_ns_load_table(table_info.installed_desc,
acpi_gbl_root_node);
break;
}
if (ACPI_FAILURE(status)) {
/* Uninstall table and free the buffer */
(void)acpi_tb_uninstall_table(table_info.installed_desc);
}
return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_load_table)
/*******************************************************************************
*
* FUNCTION: acpi_unload_table
*
* PARAMETERS: table_type - Type of table to be unloaded
*
* RETURN: Status
*
* DESCRIPTION: This routine is used to force the unload of a table
*
******************************************************************************/
acpi_status acpi_unload_table(acpi_table_type table_type)
{
struct acpi_table_desc *table_desc;
ACPI_FUNCTION_TRACE(acpi_unload_table);
/* Parameter validation */
if (table_type > ACPI_TABLE_ID_MAX) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/* Find all tables of the requested type */
table_desc = acpi_gbl_table_lists[table_type].next;
if (!table_desc) {
return_ACPI_STATUS(AE_NOT_EXIST);
}
while (table_desc) {
/*
* 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_ns_delete_namespace_by_owner(table_desc->owner_id);
table_desc = table_desc->next;
}
/* Delete (or unmap) all tables of this type */
acpi_tb_delete_tables_by_type(table_type);
return_ACPI_STATUS(AE_OK);
}
ACPI_EXPORT_SYMBOL(acpi_unload_table)
/*******************************************************************************
*
* FUNCTION: acpi_get_table_header
*
* PARAMETERS: table_type - one of the defined table types
* Instance - the non zero instance of the table, allows
* support for multiple tables of the same type
* see acpi_gbl_acpi_table_flag
* out_table_header - pointer to the struct acpi_table_header if successful
*
* DESCRIPTION: This function is called to get an ACPI table header. The caller
* supplies an pointer to a data area sufficient to contain an ACPI
* struct acpi_table_header structure.
*
* The header contains a length field that can be used to determine
* the size of the buffer needed to contain the entire table. This
* function is not valid for the RSD PTR table since it does not
* have a standard header and is fixed length.
*
******************************************************************************/
acpi_status
acpi_get_table_header(acpi_table_type table_type,
u32 instance, struct acpi_table_header *out_table_header)
{
struct acpi_table_header *tbl_ptr;
acpi_status status;
ACPI_FUNCTION_TRACE(acpi_get_table_header);
if ((instance == 0) ||
(table_type == ACPI_TABLE_ID_RSDP) || (!out_table_header)) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/* Check the table type and instance */
if ((table_type > ACPI_TABLE_ID_MAX) ||
(ACPI_IS_SINGLE_TABLE(acpi_gbl_table_data[table_type].flags) &&
instance > 1)) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/* Get a pointer to the entire table */
status = acpi_tb_get_table_ptr(table_type, instance, &tbl_ptr);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* The function will return a NULL pointer if the table is not loaded */
if (tbl_ptr == NULL) {
return_ACPI_STATUS(AE_NOT_EXIST);
}
/* Copy the header to the caller's buffer */
ACPI_MEMCPY(ACPI_CAST_PTR(void, out_table_header),
ACPI_CAST_PTR(void, tbl_ptr),
sizeof(struct acpi_table_header));
return_ACPI_STATUS(status);
}
ACPI_EXPORT_SYMBOL(acpi_get_table_header)
#endif /* ACPI_FUTURE_USAGE */
/*******************************************************************************
*
* FUNCTION: acpi_get_table
*
* PARAMETERS: table_type - one of the defined table types
* Instance - the non zero instance of the table, allows
* support for multiple tables of the same type
* see acpi_gbl_acpi_table_flag
* ret_buffer - pointer to a structure containing a buffer to
* receive the table
*
* RETURN: Status
*
* DESCRIPTION: This function is called to get an ACPI table. The caller
* supplies an out_buffer large enough to contain the entire ACPI
* table. The caller should call the acpi_get_table_header function
* first to determine the buffer size needed. Upon completion
* the out_buffer->Length field will indicate the number of bytes
* copied into the out_buffer->buf_ptr buffer. This table will be
* a complete table including the header.
*
******************************************************************************/
acpi_status
acpi_get_table(acpi_table_type table_type,
u32 instance, struct acpi_buffer *ret_buffer)
{
struct acpi_table_header *tbl_ptr;
acpi_status status;
acpi_size table_length;
ACPI_FUNCTION_TRACE(acpi_get_table);
/* Parameter validation */
if (instance == 0) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
status = acpi_ut_validate_buffer(ret_buffer);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Check the table type and instance */
if ((table_type > ACPI_TABLE_ID_MAX) ||
(ACPI_IS_SINGLE_TABLE(acpi_gbl_table_data[table_type].flags) &&
instance > 1)) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/* Get a pointer to the entire table */
status = acpi_tb_get_table_ptr(table_type, instance, &tbl_ptr);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/*
* acpi_tb_get_table_ptr will return a NULL pointer if the
* table is not loaded.
*/
if (tbl_ptr == NULL) {
return_ACPI_STATUS(AE_NOT_EXIST);
}
/* Get the table length */
if (table_type == ACPI_TABLE_ID_RSDP) {
/* RSD PTR is the only "table" without a header */
table_length = sizeof(struct rsdp_descriptor);
} else {
table_length = (acpi_size) tbl_ptr->length;
}
/* Validate/Allocate/Clear caller buffer */
status = acpi_ut_initialize_buffer(ret_buffer, table_length);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Copy the table to the buffer */
ACPI_MEMCPY(ACPI_CAST_PTR(void, ret_buffer->pointer),
ACPI_CAST_PTR(void, tbl_ptr), table_length);
return_ACPI_STATUS(AE_OK);
}
ACPI_EXPORT_SYMBOL(acpi_get_table)
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