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linux/drivers/acpi/tables/tbget.c

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/******************************************************************************
*
* Module Name: tbget - ACPI Table get* routines
*
*****************************************************************************/
/*
* 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("tbget")
/* Local prototypes */
static acpi_status
acpi_tb_get_this_table(struct acpi_pointer *address,
struct acpi_table_header *header,
struct acpi_table_desc *table_info);
static acpi_status
acpi_tb_table_override(struct acpi_table_header *header,
struct acpi_table_desc *table_info);
/*******************************************************************************
*
* FUNCTION: acpi_tb_get_table
*
* PARAMETERS: Address - Address of table to retrieve. Can be
* Logical or Physical
* table_info - Where table info is returned
*
* RETURN: None
*
* DESCRIPTION: Get entire table of unknown size.
*
******************************************************************************/
acpi_status
acpi_tb_get_table(struct acpi_pointer *address,
struct acpi_table_desc *table_info)
{
acpi_status status;
struct acpi_table_header header;
ACPI_FUNCTION_TRACE("tb_get_table");
/* Get the header in order to get signature and table size */
status = acpi_tb_get_table_header(address, &header);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Get the entire table */
status = acpi_tb_get_table_body(address, &header, table_info);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status,
"Could not get ACPI table (size %X)",
header.length));
return_ACPI_STATUS(status);
}
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_get_table_header
*
* PARAMETERS: Address - Address of table to retrieve. Can be
* Logical or Physical
* return_header - Where the table header is returned
*
* RETURN: Status
*
* DESCRIPTION: Get an ACPI table header. Works in both physical or virtual
* addressing mode. Works with both physical or logical pointers.
* Table is either copied or mapped, depending on the pointer
* type and mode of the processor.
*
******************************************************************************/
acpi_status
acpi_tb_get_table_header(struct acpi_pointer *address,
struct acpi_table_header *return_header)
{
acpi_status status = AE_OK;
struct acpi_table_header *header = NULL;
ACPI_FUNCTION_TRACE("tb_get_table_header");
/*
* Flags contains the current processor mode (Virtual or Physical
* addressing) The pointer_type is either Logical or Physical
*/
switch (address->pointer_type) {
case ACPI_PHYSMODE_PHYSPTR:
case ACPI_LOGMODE_LOGPTR:
/* Pointer matches processor mode, copy the header */
ACPI_MEMCPY(return_header, address->pointer.logical,
sizeof(struct acpi_table_header));
break;
case ACPI_LOGMODE_PHYSPTR:
/* Create a logical address for the physical pointer */
status = acpi_os_map_memory(address->pointer.physical,
sizeof(struct acpi_table_header),
(void *)&header);
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
/* Copy header and delete mapping */
ACPI_MEMCPY(return_header, header,
sizeof(struct acpi_table_header));
acpi_os_unmap_memory(header, sizeof(struct acpi_table_header));
break;
default:
ACPI_ERROR((AE_INFO, "Invalid address flags %X",
address->pointer_type));
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
ACPI_DEBUG_PRINT((ACPI_DB_TABLES, "Table Signature: [%4.4s]\n",
return_header->signature));
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_get_table_body
*
* PARAMETERS: Address - Address of table to retrieve. Can be
* Logical or Physical
* Header - Header of the table to retrieve
* table_info - Where the table info is returned
*
* RETURN: Status
*
* DESCRIPTION: Get an entire ACPI table with support to allow the host OS to
* replace the table with a newer version (table override.)
* Works in both physical or virtual
* addressing mode. Works with both physical or logical pointers.
* Table is either copied or mapped, depending on the pointer
* type and mode of the processor.
*
******************************************************************************/
acpi_status
acpi_tb_get_table_body(struct acpi_pointer *address,
struct acpi_table_header *header,
struct acpi_table_desc *table_info)
{
acpi_status status;
ACPI_FUNCTION_TRACE("tb_get_table_body");
if (!table_info || !address) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/* Attempt table override. */
status = acpi_tb_table_override(header, table_info);
if (ACPI_SUCCESS(status)) {
/* Table was overridden by the host OS */
return_ACPI_STATUS(status);
}
/* No override, get the original table */
status = acpi_tb_get_this_table(address, header, table_info);
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_table_override
*
* PARAMETERS: Header - Pointer to table header
* table_info - Return info if table is overridden
*
* RETURN: None
*
* DESCRIPTION: Attempts override of current table with a new one if provided
* by the host OS.
*
******************************************************************************/
static acpi_status
acpi_tb_table_override(struct acpi_table_header *header,
struct acpi_table_desc *table_info)
{
struct acpi_table_header *new_table;
acpi_status status;
struct acpi_pointer address;
ACPI_FUNCTION_TRACE("tb_table_override");
/*
* The OSL will examine the header and decide whether to override this
* table. If it decides to override, a table will be returned in new_table,
* which we will then copy.
*/
status = acpi_os_table_override(header, &new_table);
if (ACPI_FAILURE(status)) {
/* Some severe error from the OSL, but we basically ignore it */
ACPI_EXCEPTION((AE_INFO, status,
"Could not override ACPI table"));
return_ACPI_STATUS(status);
}
if (!new_table) {
/* No table override */
return_ACPI_STATUS(AE_NO_ACPI_TABLES);
}
/*
* We have a new table to override the old one. Get a copy of
* the new one. We know that the new table has a logical pointer.
*/
address.pointer_type = ACPI_LOGICAL_POINTER | ACPI_LOGICAL_ADDRESSING;
address.pointer.logical = new_table;
status = acpi_tb_get_this_table(&address, new_table, table_info);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Could not copy ACPI table"));
return_ACPI_STATUS(status);
}
/* Copy the table info */
ACPI_INFO((AE_INFO, "Table [%4.4s] replaced by host OS",
table_info->pointer->signature));
return_ACPI_STATUS(AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_get_this_table
*
* PARAMETERS: Address - Address of table to retrieve. Can be
* Logical or Physical
* Header - Header of the table to retrieve
* table_info - Where the table info is returned
*
* RETURN: Status
*
* DESCRIPTION: Get an entire ACPI table. Works in both physical or virtual
* addressing mode. Works with both physical or logical pointers.
* Table is either copied or mapped, depending on the pointer
* type and mode of the processor.
*
******************************************************************************/
static acpi_status
acpi_tb_get_this_table(struct acpi_pointer *address,
struct acpi_table_header *header,
struct acpi_table_desc *table_info)
{
struct acpi_table_header *full_table = NULL;
u8 allocation;
acpi_status status = AE_OK;
ACPI_FUNCTION_TRACE("tb_get_this_table");
/*
* Flags contains the current processor mode (Virtual or Physical
* addressing) The pointer_type is either Logical or Physical
*/
switch (address->pointer_type) {
case ACPI_PHYSMODE_PHYSPTR:
case ACPI_LOGMODE_LOGPTR:
/* Pointer matches processor mode, copy the table to a new buffer */
full_table = ACPI_MEM_ALLOCATE(header->length);
if (!full_table) {
ACPI_ERROR((AE_INFO,
"Could not allocate table memory for [%4.4s] length %X",
header->signature, header->length));
return_ACPI_STATUS(AE_NO_MEMORY);
}
/* Copy the entire table (including header) to the local buffer */
ACPI_MEMCPY(full_table, address->pointer.logical,
header->length);
/* Save allocation type */
allocation = ACPI_MEM_ALLOCATED;
break;
case ACPI_LOGMODE_PHYSPTR:
/*
* Just map the table's physical memory
* into our address space.
*/
status = acpi_os_map_memory(address->pointer.physical,
(acpi_size) header->length,
(void *)&full_table);
if (ACPI_FAILURE(status)) {
ACPI_ERROR((AE_INFO,
"Could not map memory for table [%4.4s] at %8.8X%8.8X for length %X",
header->signature,
ACPI_FORMAT_UINT64(address->pointer.
physical),
header->length));
return (status);
}
/* Save allocation type */
allocation = ACPI_MEM_MAPPED;
break;
default:
ACPI_ERROR((AE_INFO, "Invalid address flags %X",
address->pointer_type));
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/*
* Validate checksum for _most_ tables,
* even the ones whose signature we don't recognize
*/
if (table_info->type != ACPI_TABLE_FACS) {
status = acpi_tb_verify_table_checksum(full_table);
#if (!ACPI_CHECKSUM_ABORT)
if (ACPI_FAILURE(status)) {
/* Ignore the error if configuration says so */
status = AE_OK;
}
#endif
}
/* Return values */
table_info->pointer = full_table;
table_info->length = (acpi_size) header->length;
table_info->allocation = allocation;
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Found table [%4.4s] at %8.8X%8.8X, mapped/copied to %p\n",
full_table->signature,
ACPI_FORMAT_UINT64(address->pointer.physical),
full_table));
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_get_table_ptr
*
* PARAMETERS: table_type - one of the defined table types
* Instance - Which table of this type
* table_ptr_loc - pointer to location to place the pointer for
* return
*
* RETURN: Status
*
* DESCRIPTION: This function is called to get the pointer to an ACPI table.
*
******************************************************************************/
acpi_status
acpi_tb_get_table_ptr(acpi_table_type table_type,
u32 instance, struct acpi_table_header **table_ptr_loc)
{
struct acpi_table_desc *table_desc;
u32 i;
ACPI_FUNCTION_TRACE("tb_get_table_ptr");
if (!acpi_gbl_DSDT) {
return_ACPI_STATUS(AE_NO_ACPI_TABLES);
}
if (table_type > ACPI_TABLE_MAX) {
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
/*
* For all table types (Single/Multiple), the first
* instance is always in the list head.
*/
if (instance == 1) {
/* Get the first */
*table_ptr_loc = NULL;
if (acpi_gbl_table_lists[table_type].next) {
*table_ptr_loc =
acpi_gbl_table_lists[table_type].next->pointer;
}
return_ACPI_STATUS(AE_OK);
}
/* Check for instance out of range */
if (instance > acpi_gbl_table_lists[table_type].count) {
return_ACPI_STATUS(AE_NOT_EXIST);
}
/* Walk the list to get the desired table
* Since the if (Instance == 1) check above checked for the
* first table, setting table_desc equal to the .Next member
* is actually pointing to the second table. Therefore, we
* need to walk from the 2nd table until we reach the Instance
* that the user is looking for and return its table pointer.
*/
table_desc = acpi_gbl_table_lists[table_type].next;
for (i = 2; i < instance; i++) {
table_desc = table_desc->next;
}
/* We are now pointing to the requested table's descriptor */
*table_ptr_loc = table_desc->pointer;
return_ACPI_STATUS(AE_OK);
}
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