343 lines
10 KiB
C
343 lines
10 KiB
C
/******************************************************************************
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*
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* Module Name: tbutils - Table manipulation utilities
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2006, R. Byron Moore
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include <acpi/actables.h>
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#define _COMPONENT ACPI_TABLES
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ACPI_MODULE_NAME("tbutils")
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/* Local prototypes */
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#ifdef ACPI_OBSOLETE_FUNCTIONS
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acpi_status
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acpi_tb_handle_to_object(u16 table_id, struct acpi_table_desc **table_desc);
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#endif
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_is_table_installed
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*
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* PARAMETERS: new_table_desc - Descriptor for new table being installed
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*
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* RETURN: Status - AE_ALREADY_EXISTS if the table is already installed
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*
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* DESCRIPTION: Determine if an ACPI table is already installed
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*
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* MUTEX: Table data structures should be locked
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*
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******************************************************************************/
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acpi_status acpi_tb_is_table_installed(struct acpi_table_desc *new_table_desc)
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{
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struct acpi_table_desc *table_desc;
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ACPI_FUNCTION_TRACE(tb_is_table_installed);
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/* Get the list descriptor and first table descriptor */
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table_desc = acpi_gbl_table_lists[new_table_desc->type].next;
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/* Examine all installed tables of this type */
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while (table_desc) {
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/*
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* If the table lengths match, perform a full bytewise compare. This
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* means that we will allow tables with duplicate oem_table_id(s), as
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* long as the tables are different in some way.
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*
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* Checking if the table has been loaded into the namespace means that
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* we don't check for duplicate tables during the initial installation
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* of tables within the RSDT/XSDT.
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*/
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if ((table_desc->loaded_into_namespace) &&
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(table_desc->pointer->length ==
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new_table_desc->pointer->length)
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&&
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(!ACPI_MEMCMP
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(table_desc->pointer, new_table_desc->pointer,
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new_table_desc->pointer->length))) {
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/* Match: this table is already installed */
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ACPI_DEBUG_PRINT((ACPI_DB_TABLES,
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"Table [%4.4s] already installed: Rev %X OemTableId [%8.8s]\n",
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new_table_desc->pointer->signature,
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new_table_desc->pointer->revision,
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new_table_desc->pointer->
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oem_table_id));
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new_table_desc->owner_id = table_desc->owner_id;
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new_table_desc->installed_desc = table_desc;
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return_ACPI_STATUS(AE_ALREADY_EXISTS);
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}
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/* Get next table on the list */
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table_desc = table_desc->next;
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}
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_validate_table_header
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*
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* PARAMETERS: table_header - Logical pointer to the table
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*
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* RETURN: Status
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*
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* DESCRIPTION: Check an ACPI table header for validity
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*
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* NOTE: Table pointers are validated as follows:
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* 1) Table pointer must point to valid physical memory
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* 2) Signature must be 4 ASCII chars, even if we don't recognize the
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* name
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* 3) Table must be readable for length specified in the header
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* 4) Table checksum must be valid (with the exception of the FACS
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* which has no checksum because it contains variable fields)
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*
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******************************************************************************/
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acpi_status
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acpi_tb_validate_table_header(struct acpi_table_header *table_header)
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{
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acpi_name signature;
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ACPI_FUNCTION_ENTRY();
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/* Verify that this is a valid address */
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if (!acpi_os_readable(table_header, sizeof(struct acpi_table_header))) {
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ACPI_ERROR((AE_INFO,
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"Cannot read table header at %p", table_header));
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return (AE_BAD_ADDRESS);
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}
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/* Ensure that the signature is 4 ASCII characters */
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ACPI_MOVE_32_TO_32(&signature, table_header->signature);
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if (!acpi_ut_valid_acpi_name(signature)) {
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ACPI_ERROR((AE_INFO, "Invalid table signature 0x%8.8X",
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signature));
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ACPI_DUMP_BUFFER(table_header,
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sizeof(struct acpi_table_header));
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return (AE_BAD_SIGNATURE);
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}
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/* Validate the table length */
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if (table_header->length < sizeof(struct acpi_table_header)) {
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ACPI_ERROR((AE_INFO,
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"Invalid length 0x%X in table with signature %4.4s",
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(u32) table_header->length,
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ACPI_CAST_PTR(char, &signature)));
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ACPI_DUMP_BUFFER(table_header,
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sizeof(struct acpi_table_header));
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return (AE_BAD_HEADER);
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}
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return (AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_sum_table
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*
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* PARAMETERS: Buffer - Buffer to sum
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* Length - Size of the buffer
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*
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* RETURN: 8 bit sum of buffer
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*
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* DESCRIPTION: Computes an 8 bit sum of the buffer(length) and returns it.
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*
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******************************************************************************/
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u8 acpi_tb_sum_table(void *buffer, u32 length)
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{
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acpi_native_uint i;
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u8 sum = 0;
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if (!buffer || !length) {
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return (0);
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}
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for (i = 0; i < length; i++) {
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sum = (u8) (sum + ((u8 *) buffer)[i]);
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}
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return (sum);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_generate_checksum
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*
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* PARAMETERS: Table - Pointer to a valid ACPI table (with a
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* standard ACPI header)
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*
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* RETURN: 8 bit checksum of buffer
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*
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* DESCRIPTION: Computes an 8 bit checksum of the table.
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*
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******************************************************************************/
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u8 acpi_tb_generate_checksum(struct acpi_table_header * table)
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{
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u8 checksum;
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/* Sum the entire table as-is */
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checksum = acpi_tb_sum_table(table, table->length);
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/* Subtract off the existing checksum value in the table */
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checksum = (u8) (checksum - table->checksum);
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/* Compute the final checksum */
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checksum = (u8) (0 - checksum);
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return (checksum);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_set_checksum
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*
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* PARAMETERS: Table - Pointer to a valid ACPI table (with a
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* standard ACPI header)
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*
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* RETURN: None. Sets the table checksum field
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*
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* DESCRIPTION: Computes an 8 bit checksum of the table and inserts the
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* checksum into the table header.
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*
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******************************************************************************/
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void acpi_tb_set_checksum(struct acpi_table_header *table)
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{
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table->checksum = acpi_tb_generate_checksum(table);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_verify_table_checksum
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*
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* PARAMETERS: *table_header - ACPI table to verify
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*
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* RETURN: 8 bit checksum of table
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*
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* DESCRIPTION: Generates an 8 bit checksum of table and returns and compares
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* it to the existing checksum value.
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*
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******************************************************************************/
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acpi_status
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acpi_tb_verify_table_checksum(struct acpi_table_header *table_header)
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{
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u8 checksum;
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ACPI_FUNCTION_TRACE(tb_verify_table_checksum);
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/* Compute the checksum on the table */
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checksum = acpi_tb_generate_checksum(table_header);
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/* Checksum ok? */
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if (checksum == table_header->checksum) {
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return_ACPI_STATUS(AE_OK);
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}
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ACPI_WARNING((AE_INFO,
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"Incorrect checksum in table [%4.4s] - is %2.2X, should be %2.2X",
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table_header->signature, table_header->checksum,
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checksum));
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return_ACPI_STATUS(AE_BAD_CHECKSUM);
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}
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#ifdef ACPI_OBSOLETE_FUNCTIONS
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_handle_to_object
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*
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* PARAMETERS: table_id - Id for which the function is searching
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* table_desc - Pointer to return the matching table
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* descriptor.
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*
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* RETURN: Search the tables to find one with a matching table_id and
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* return a pointer to that table descriptor.
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*
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******************************************************************************/
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acpi_status
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acpi_tb_handle_to_object(u16 table_id,
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struct acpi_table_desc **return_table_desc)
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{
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u32 i;
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struct acpi_table_desc *table_desc;
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ACPI_FUNCTION_NAME(tb_handle_to_object);
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for (i = 0; i < ACPI_TABLE_MAX; i++) {
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table_desc = acpi_gbl_table_lists[i].next;
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while (table_desc) {
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if (table_desc->table_id == table_id) {
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*return_table_desc = table_desc;
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return (AE_OK);
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}
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table_desc = table_desc->next;
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}
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}
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ACPI_ERROR((AE_INFO, "TableId=%X does not exist", table_id));
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return (AE_BAD_PARAMETER);
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}
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#endif
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