241 lines
7.5 KiB
C
241 lines
7.5 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 - 2005, 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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/*******************************************************************************
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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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#ifdef ACPI_FUTURE_USAGE
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acpi_status
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acpi_tb_handle_to_object (
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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_DEBUG_PRINT ((ACPI_DB_ERROR, "table_id=%X does not exist\n", table_id));
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return (AE_BAD_PARAMETER);
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}
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#endif /* ACPI_FUTURE_USAGE */
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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 (
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struct acpi_table_header *table_header)
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{
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acpi_name signature;
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ACPI_FUNCTION_NAME ("tb_validate_table_header");
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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_DEBUG_PRINT ((ACPI_DB_ERROR,
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"Cannot read table header at %p\n", 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_DEBUG_PRINT ((ACPI_DB_ERROR,
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"Table signature at %p [%p] has invalid characters\n",
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table_header, &signature));
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ACPI_REPORT_WARNING (("Invalid table signature found: [%4.4s]\n",
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(char *) &signature));
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ACPI_DUMP_BUFFER (table_header, 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_DEBUG_PRINT ((ACPI_DB_ERROR,
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"Invalid length in table header %p name %4.4s\n",
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table_header, (char *) &signature));
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ACPI_REPORT_WARNING (("Invalid table header length (0x%X) found\n",
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(u32) table_header->length));
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ACPI_DUMP_BUFFER (table_header, 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_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: Does an 8 bit checksum of table and returns status. A correct
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* table should have a checksum of 0.
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*
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******************************************************************************/
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acpi_status
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acpi_tb_verify_table_checksum (
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struct acpi_table_header *table_header)
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{
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u8 checksum;
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acpi_status status = AE_OK;
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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_checksum (table_header, table_header->length);
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/* Return the appropriate exception */
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if (checksum) {
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ACPI_REPORT_WARNING (("Invalid checksum in table [%4.4s] (%02X, sum %02X is not zero)\n",
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table_header->signature, (u32) table_header->checksum, (u32) checksum));
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status = AE_BAD_CHECKSUM;
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}
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return_ACPI_STATUS (status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_checksum
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*
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* PARAMETERS: Buffer - Buffer to checksum
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* Length - Size of the buffer
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*
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* RETURNS 8 bit checksum of buffer
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*
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* DESCRIPTION: Computes an 8 bit checksum of the buffer(length) and returns it.
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*
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******************************************************************************/
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u8
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acpi_tb_checksum (
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void *buffer,
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u32 length)
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{
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const u8 *limit;
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const u8 *rover;
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u8 sum = 0;
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if (buffer && length) {
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/* Buffer and Length are valid */
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limit = (u8 *) buffer + length;
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for (rover = buffer; rover < limit; rover++) {
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sum = (u8) (sum + *rover);
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}
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}
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return (sum);
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}
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