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