forked from Minki/linux
0c9938cc75
Implemented support to ignore an attempt to install/load a particular ACPI table more than once. Apparently there exists BIOS code that repeatedly attempts to load the same SSDT upon certain events. Thanks to Venkatesh Pallipadi. Restructured the main interface to the AML parser in order to correctly handle all exceptional conditions. This will prevent leakage of the OwnerId resource and should eliminate the AE_OWNER_ID_LIMIT exceptions seen on some machines. Thanks to Alexey Starikovskiy. Support for "module level code" has been disabled in this version due to a number of issues that have appeared on various machines. The support can be enabled by defining ACPI_ENABLE_MODULE_LEVEL_CODE during subsystem compilation. When the issues are fully resolved, the code will be enabled by default again. Modified the internal functions for debug print support to define the FunctionName parameter as a (const char *) for compatibility with compiler built-in macros such as __FUNCTION__, etc. Linted the entire ACPICA source tree for both 32-bit and 64-bit. Signed-off-by: Robert Moore <robert.moore@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
317 lines
9.3 KiB
C
317 lines
9.3 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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/* 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 (
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u16 table_id,
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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
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acpi_tb_is_table_installed (
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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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/* Compare Revision and oem_table_id */
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if ((table_desc->loaded_into_namespace) &&
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(table_desc->pointer->revision ==
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new_table_desc->pointer->revision) &&
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(!ACPI_MEMCMP (table_desc->pointer->oem_table_id,
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new_table_desc->pointer->oem_table_id, 8))) {
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/* 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 oem_table_id [%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->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 (
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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_generate_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 ((
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"Invalid checksum in table [%4.4s] (%02X, sum %02X is not zero)\n",
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table_header->signature, (u32) table_header->checksum,
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(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_generate_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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* RETURN: 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_generate_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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#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 (
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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
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