689 lines
20 KiB
C
689 lines
20 KiB
C
/******************************************************************************
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*
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* Module Name: tbutils - table utilities
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2008, Intel Corp.
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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 "accommon.h"
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#include "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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static void acpi_tb_fix_string(char *string, acpi_size length);
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static void
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acpi_tb_cleanup_table_header(struct acpi_table_header *out_header,
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struct acpi_table_header *header);
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static acpi_physical_address
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acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size);
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_check_xsdt
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*
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* PARAMETERS: address - Pointer to the XSDT
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*
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* RETURN: status
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* AE_OK - XSDT is okay
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* AE_NO_MEMORY - can't map XSDT
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* AE_INVALID_TABLE_LENGTH - invalid table length
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* AE_NULL_ENTRY - XSDT has NULL entry
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*
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* DESCRIPTION: validate XSDT
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******************************************************************************/
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static acpi_status
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acpi_tb_check_xsdt(acpi_physical_address address)
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{
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struct acpi_table_header *table;
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u32 length;
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u64 xsdt_entry_address;
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u8 *table_entry;
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u32 table_count;
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int i;
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table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
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if (!table)
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return AE_NO_MEMORY;
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length = table->length;
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acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
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if (length < sizeof(struct acpi_table_header))
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return AE_INVALID_TABLE_LENGTH;
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table = acpi_os_map_memory(address, length);
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if (!table)
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return AE_NO_MEMORY;
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/* Calculate the number of tables described in XSDT */
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table_count =
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(u32) ((table->length -
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sizeof(struct acpi_table_header)) / sizeof(u64));
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table_entry =
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ACPI_CAST_PTR(u8, table) + sizeof(struct acpi_table_header);
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for (i = 0; i < table_count; i++) {
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ACPI_MOVE_64_TO_64(&xsdt_entry_address, table_entry);
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if (!xsdt_entry_address) {
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/* XSDT has NULL entry */
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break;
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}
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table_entry += sizeof(u64);
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}
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acpi_os_unmap_memory(table, length);
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if (i < table_count)
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return AE_NULL_ENTRY;
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else
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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_initialize_facs
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*
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* PARAMETERS: None
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*
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* RETURN: Status
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*
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* DESCRIPTION: Create a permanent mapping for the FADT and save it in a global
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* for accessing the Global Lock and Firmware Waking Vector
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*
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******************************************************************************/
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acpi_status acpi_tb_initialize_facs(void)
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{
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acpi_status status;
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status = acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS,
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ACPI_CAST_INDIRECT_PTR(struct
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acpi_table_header,
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&acpi_gbl_FACS));
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return status;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_tables_loaded
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*
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* PARAMETERS: None
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*
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* RETURN: TRUE if required ACPI tables are loaded
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*
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* DESCRIPTION: Determine if the minimum required ACPI tables are present
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* (FADT, FACS, DSDT)
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*
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******************************************************************************/
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u8 acpi_tb_tables_loaded(void)
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{
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if (acpi_gbl_root_table_list.count >= 3) {
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return (TRUE);
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}
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return (FALSE);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_fix_string
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*
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* PARAMETERS: String - String to be repaired
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* Length - Maximum length
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*
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* RETURN: None
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*
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* DESCRIPTION: Replace every non-printable or non-ascii byte in the string
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* with a question mark '?'.
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*
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******************************************************************************/
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static void acpi_tb_fix_string(char *string, acpi_size length)
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{
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while (length && *string) {
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if (!ACPI_IS_PRINT(*string)) {
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*string = '?';
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}
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string++;
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length--;
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_cleanup_table_header
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*
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* PARAMETERS: out_header - Where the cleaned header is returned
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* Header - Input ACPI table header
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*
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* RETURN: Returns the cleaned header in out_header
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*
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* DESCRIPTION: Copy the table header and ensure that all "string" fields in
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* the header consist of printable characters.
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*
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******************************************************************************/
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static void
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acpi_tb_cleanup_table_header(struct acpi_table_header *out_header,
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struct acpi_table_header *header)
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{
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ACPI_MEMCPY(out_header, header, sizeof(struct acpi_table_header));
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acpi_tb_fix_string(out_header->signature, ACPI_NAME_SIZE);
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acpi_tb_fix_string(out_header->oem_id, ACPI_OEM_ID_SIZE);
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acpi_tb_fix_string(out_header->oem_table_id, ACPI_OEM_TABLE_ID_SIZE);
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acpi_tb_fix_string(out_header->asl_compiler_id, ACPI_NAME_SIZE);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_print_table_header
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*
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* PARAMETERS: Address - Table physical address
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* Header - Table header
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*
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* RETURN: None
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*
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* DESCRIPTION: Print an ACPI table header. Special cases for FACS and RSDP.
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*
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******************************************************************************/
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void
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acpi_tb_print_table_header(acpi_physical_address address,
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struct acpi_table_header *header)
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{
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struct acpi_table_header local_header;
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/*
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* The reason that the Address is cast to a void pointer is so that we
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* can use %p which will work properly on both 32-bit and 64-bit hosts.
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*/
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if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_FACS)) {
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/* FACS only has signature and length fields */
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ACPI_INFO((AE_INFO, "%4.4s %p %05X",
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header->signature, ACPI_CAST_PTR(void, address),
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header->length));
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} else if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_RSDP)) {
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/* RSDP has no common fields */
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ACPI_MEMCPY(local_header.oem_id,
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ACPI_CAST_PTR(struct acpi_table_rsdp,
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header)->oem_id, ACPI_OEM_ID_SIZE);
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acpi_tb_fix_string(local_header.oem_id, ACPI_OEM_ID_SIZE);
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ACPI_INFO((AE_INFO, "RSDP %p %05X (v%.2d %6.6s)",
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ACPI_CAST_PTR (void, address),
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(ACPI_CAST_PTR(struct acpi_table_rsdp, header)->
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revision >
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0) ? ACPI_CAST_PTR(struct acpi_table_rsdp,
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header)->length : 20,
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ACPI_CAST_PTR(struct acpi_table_rsdp,
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header)->revision,
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local_header.oem_id));
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} else {
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/* Standard ACPI table with full common header */
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acpi_tb_cleanup_table_header(&local_header, header);
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ACPI_INFO((AE_INFO,
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"%4.4s %p %05X (v%.2d %6.6s %8.8s %08X %4.4s %08X)",
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local_header.signature, ACPI_CAST_PTR(void, address),
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local_header.length, local_header.revision,
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local_header.oem_id, local_header.oem_table_id,
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local_header.oem_revision,
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local_header.asl_compiler_id,
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local_header.asl_compiler_revision));
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_validate_checksum
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*
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* PARAMETERS: Table - ACPI table to verify
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* Length - Length of entire table
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*
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* RETURN: Status
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*
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* DESCRIPTION: Verifies that the table checksums to zero. Optionally returns
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* exception on bad checksum.
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*
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******************************************************************************/
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acpi_status acpi_tb_verify_checksum(struct acpi_table_header *table, u32 length)
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{
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u8 checksum;
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/* Compute the checksum on the table */
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checksum = acpi_tb_checksum(ACPI_CAST_PTR(u8, table), length);
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/* Checksum ok? (should be zero) */
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if (checksum) {
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ACPI_WARNING((AE_INFO,
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"Incorrect checksum in table [%4.4s] - %2.2X, should be %2.2X",
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table->signature, table->checksum,
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(u8) (table->checksum - checksum)));
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#if (ACPI_CHECKSUM_ABORT)
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return (AE_BAD_CHECKSUM);
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#endif
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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_checksum
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*
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* PARAMETERS: Buffer - Pointer to memory region to be checked
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* Length - Length of this memory region
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*
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* RETURN: Checksum (u8)
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*
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* DESCRIPTION: Calculates circular checksum of memory region.
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*
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******************************************************************************/
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u8 acpi_tb_checksum(u8 *buffer, u32 length)
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{
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u8 sum = 0;
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u8 *end = buffer + length;
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while (buffer < end) {
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sum = (u8) (sum + *(buffer++));
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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_install_table
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*
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* PARAMETERS: Address - Physical address of DSDT or FACS
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* Signature - Table signature, NULL if no need to
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* match
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* table_index - Index into root table array
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*
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* RETURN: None
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*
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* DESCRIPTION: Install an ACPI table into the global data structure. The
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* table override mechanism is implemented here to allow the host
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* OS to replace any table before it is installed in the root
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* table array.
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*
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******************************************************************************/
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void
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acpi_tb_install_table(acpi_physical_address address,
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char *signature, u32 table_index)
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{
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u8 flags;
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acpi_status status;
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struct acpi_table_header *table_to_install;
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struct acpi_table_header *mapped_table;
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struct acpi_table_header *override_table = NULL;
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if (!address) {
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ACPI_ERROR((AE_INFO,
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"Null physical address for ACPI table [%s]",
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signature));
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return;
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}
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/* Map just the table header */
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mapped_table =
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acpi_os_map_memory(address, sizeof(struct acpi_table_header));
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if (!mapped_table) {
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return;
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}
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/* If a particular signature is expected (DSDT/FACS), it must match */
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if (signature && !ACPI_COMPARE_NAME(mapped_table->signature, signature)) {
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ACPI_ERROR((AE_INFO,
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"Invalid signature 0x%X for ACPI table, expected [%s]",
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*ACPI_CAST_PTR(u32, mapped_table->signature),
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signature));
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goto unmap_and_exit;
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}
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/*
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* ACPI Table Override:
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*
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* Before we install the table, let the host OS override it with a new
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* one if desired. Any table within the RSDT/XSDT can be replaced,
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* including the DSDT which is pointed to by the FADT.
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*/
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status = acpi_os_table_override(mapped_table, &override_table);
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if (ACPI_SUCCESS(status) && override_table) {
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ACPI_INFO((AE_INFO,
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"%4.4s @ 0x%p Table override, replaced with:",
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mapped_table->signature, ACPI_CAST_PTR(void,
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address)));
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acpi_gbl_root_table_list.tables[table_index].pointer =
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override_table;
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address = ACPI_PTR_TO_PHYSADDR(override_table);
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table_to_install = override_table;
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flags = ACPI_TABLE_ORIGIN_OVERRIDE;
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} else {
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table_to_install = mapped_table;
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flags = ACPI_TABLE_ORIGIN_MAPPED;
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}
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/* Initialize the table entry */
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acpi_gbl_root_table_list.tables[table_index].address = address;
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acpi_gbl_root_table_list.tables[table_index].length =
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table_to_install->length;
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acpi_gbl_root_table_list.tables[table_index].flags = flags;
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ACPI_MOVE_32_TO_32(&
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(acpi_gbl_root_table_list.tables[table_index].
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signature), table_to_install->signature);
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acpi_tb_print_table_header(address, table_to_install);
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if (table_index == ACPI_TABLE_INDEX_DSDT) {
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/* Global integer width is based upon revision of the DSDT */
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acpi_ut_set_integer_width(table_to_install->revision);
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}
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unmap_and_exit:
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acpi_os_unmap_memory(mapped_table, sizeof(struct acpi_table_header));
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_get_root_table_entry
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*
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* PARAMETERS: table_entry - Pointer to the RSDT/XSDT table entry
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* table_entry_size - sizeof 32 or 64 (RSDT or XSDT)
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*
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* RETURN: Physical address extracted from the root table
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*
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* DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on
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* both 32-bit and 64-bit platforms
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*
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* NOTE: acpi_physical_address is 32-bit on 32-bit platforms, 64-bit on
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* 64-bit platforms.
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*
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******************************************************************************/
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static acpi_physical_address
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acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size)
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{
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u64 address64;
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/*
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* Get the table physical address (32-bit for RSDT, 64-bit for XSDT):
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* Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT
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*/
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if (table_entry_size == sizeof(u32)) {
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/*
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* 32-bit platform, RSDT: Return 32-bit table entry
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* 64-bit platform, RSDT: Expand 32-bit to 64-bit and return
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*/
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return ((acpi_physical_address)
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(*ACPI_CAST_PTR(u32, table_entry)));
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} else {
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/*
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* 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return
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* 64-bit platform, XSDT: Move (unaligned) 64-bit to local,
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* return 64-bit
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*/
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ACPI_MOVE_64_TO_64(&address64, table_entry);
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#if ACPI_MACHINE_WIDTH == 32
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if (address64 > ACPI_UINT32_MAX) {
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/* Will truncate 64-bit address to 32 bits, issue warning */
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ACPI_WARNING((AE_INFO,
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"64-bit Physical Address in XSDT is too large (%8.8X%8.8X),"
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" truncating",
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ACPI_FORMAT_UINT64(address64)));
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}
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#endif
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return ((acpi_physical_address) (address64));
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_parse_root_table
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*
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* PARAMETERS: Rsdp - Pointer to the RSDP
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*
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* RETURN: Status
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*
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* DESCRIPTION: This function is called to parse the Root System Description
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* Table (RSDT or XSDT)
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*
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* NOTE: Tables are mapped (not copied) for efficiency. The FACS must
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* be mapped and cannot be copied because it contains the actual
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* memory location of the ACPI Global Lock.
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*
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******************************************************************************/
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acpi_status __init
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acpi_tb_parse_root_table(acpi_physical_address rsdp_address)
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{
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struct acpi_table_rsdp *rsdp;
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u32 table_entry_size;
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u32 i;
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|
u32 table_count;
|
|
struct acpi_table_header *table;
|
|
acpi_physical_address address;
|
|
acpi_physical_address uninitialized_var(rsdt_address);
|
|
u32 length;
|
|
u8 *table_entry;
|
|
acpi_status status;
|
|
|
|
ACPI_FUNCTION_TRACE(tb_parse_root_table);
|
|
|
|
/*
|
|
* Map the entire RSDP and extract the address of the RSDT or XSDT
|
|
*/
|
|
rsdp = acpi_os_map_memory(rsdp_address, sizeof(struct acpi_table_rsdp));
|
|
if (!rsdp) {
|
|
return_ACPI_STATUS(AE_NO_MEMORY);
|
|
}
|
|
|
|
acpi_tb_print_table_header(rsdp_address,
|
|
ACPI_CAST_PTR(struct acpi_table_header,
|
|
rsdp));
|
|
|
|
/* Differentiate between RSDT and XSDT root tables */
|
|
|
|
if (rsdp->revision > 1 && rsdp->xsdt_physical_address
|
|
&& !acpi_rsdt_forced) {
|
|
/*
|
|
* Root table is an XSDT (64-bit physical addresses). We must use the
|
|
* XSDT if the revision is > 1 and the XSDT pointer is present, as per
|
|
* the ACPI specification.
|
|
*/
|
|
address = (acpi_physical_address) rsdp->xsdt_physical_address;
|
|
table_entry_size = sizeof(u64);
|
|
rsdt_address = (acpi_physical_address)
|
|
rsdp->rsdt_physical_address;
|
|
} else {
|
|
/* Root table is an RSDT (32-bit physical addresses) */
|
|
|
|
address = (acpi_physical_address) rsdp->rsdt_physical_address;
|
|
table_entry_size = sizeof(u32);
|
|
}
|
|
|
|
/*
|
|
* It is not possible to map more than one entry in some environments,
|
|
* so unmap the RSDP here before mapping other tables
|
|
*/
|
|
acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp));
|
|
|
|
if (table_entry_size == sizeof(u64)) {
|
|
if (acpi_tb_check_xsdt(address) == AE_NULL_ENTRY) {
|
|
/* XSDT has NULL entry, RSDT is used */
|
|
address = rsdt_address;
|
|
table_entry_size = sizeof(u32);
|
|
ACPI_WARNING((AE_INFO, "BIOS XSDT has NULL entry, "
|
|
"using RSDT"));
|
|
}
|
|
}
|
|
/* Map the RSDT/XSDT table header to get the full table length */
|
|
|
|
table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
|
|
if (!table) {
|
|
return_ACPI_STATUS(AE_NO_MEMORY);
|
|
}
|
|
|
|
acpi_tb_print_table_header(address, table);
|
|
|
|
/* Get the length of the full table, verify length and map entire table */
|
|
|
|
length = table->length;
|
|
acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
|
|
|
|
if (length < sizeof(struct acpi_table_header)) {
|
|
ACPI_ERROR((AE_INFO, "Invalid length 0x%X in RSDT/XSDT",
|
|
length));
|
|
return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
|
|
}
|
|
|
|
table = acpi_os_map_memory(address, length);
|
|
if (!table) {
|
|
return_ACPI_STATUS(AE_NO_MEMORY);
|
|
}
|
|
|
|
/* Validate the root table checksum */
|
|
|
|
status = acpi_tb_verify_checksum(table, length);
|
|
if (ACPI_FAILURE(status)) {
|
|
acpi_os_unmap_memory(table, length);
|
|
return_ACPI_STATUS(status);
|
|
}
|
|
|
|
/* Calculate the number of tables described in the root table */
|
|
|
|
table_count = (u32)((table->length - sizeof(struct acpi_table_header)) /
|
|
table_entry_size);
|
|
/*
|
|
* First two entries in the table array are reserved for the DSDT
|
|
* and FACS, which are not actually present in the RSDT/XSDT - they
|
|
* come from the FADT
|
|
*/
|
|
table_entry =
|
|
ACPI_CAST_PTR(u8, table) + sizeof(struct acpi_table_header);
|
|
acpi_gbl_root_table_list.count = 2;
|
|
|
|
/*
|
|
* Initialize the root table array from the RSDT/XSDT
|
|
*/
|
|
for (i = 0; i < table_count; i++) {
|
|
if (acpi_gbl_root_table_list.count >=
|
|
acpi_gbl_root_table_list.size) {
|
|
|
|
/* There is no more room in the root table array, attempt resize */
|
|
|
|
status = acpi_tb_resize_root_table_list();
|
|
if (ACPI_FAILURE(status)) {
|
|
ACPI_WARNING((AE_INFO,
|
|
"Truncating %u table entries!",
|
|
(unsigned) (table_count -
|
|
(acpi_gbl_root_table_list.
|
|
count - 2))));
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */
|
|
|
|
acpi_gbl_root_table_list.tables[acpi_gbl_root_table_list.count].
|
|
address =
|
|
acpi_tb_get_root_table_entry(table_entry, table_entry_size);
|
|
|
|
table_entry += table_entry_size;
|
|
acpi_gbl_root_table_list.count++;
|
|
}
|
|
|
|
/*
|
|
* It is not possible to map more than one entry in some environments,
|
|
* so unmap the root table here before mapping other tables
|
|
*/
|
|
acpi_os_unmap_memory(table, length);
|
|
|
|
/*
|
|
* Complete the initialization of the root table array by examining
|
|
* the header of each table
|
|
*/
|
|
for (i = 2; i < acpi_gbl_root_table_list.count; i++) {
|
|
acpi_tb_install_table(acpi_gbl_root_table_list.tables[i].
|
|
address, NULL, i);
|
|
|
|
/* Special case for FADT - get the DSDT and FACS */
|
|
|
|
if (ACPI_COMPARE_NAME
|
|
(&acpi_gbl_root_table_list.tables[i].signature,
|
|
ACPI_SIG_FADT)) {
|
|
acpi_tb_parse_fadt(i);
|
|
}
|
|
}
|
|
|
|
return_ACPI_STATUS(AE_OK);
|
|
}
|