mirror of https://gitee.com/openkylin/linux.git
628 lines
19 KiB
C
628 lines
19 KiB
C
/******************************************************************************
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*
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* Module Name: tbutils - ACPI Table utilities
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2013, 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 acpi_status acpi_tb_validate_xsdt(acpi_physical_address address);
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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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#if (!ACPI_REDUCED_HARDWARE)
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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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/* If Hardware Reduced flag is set, there is no FACS */
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if (acpi_gbl_reduced_hardware) {
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acpi_gbl_FACS = NULL;
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return (AE_OK);
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}
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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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#endif /* !ACPI_REDUCED_HARDWARE */
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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.current_table_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_check_dsdt_header
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*
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* PARAMETERS: None
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*
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* RETURN: None
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*
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* DESCRIPTION: Quick compare to check validity of the DSDT. This will detect
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* if the DSDT has been replaced from outside the OS and/or if
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* the DSDT header has been corrupted.
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*
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******************************************************************************/
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void acpi_tb_check_dsdt_header(void)
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{
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/* Compare original length and checksum to current values */
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if (acpi_gbl_original_dsdt_header.length != acpi_gbl_DSDT->length ||
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acpi_gbl_original_dsdt_header.checksum != acpi_gbl_DSDT->checksum) {
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ACPI_BIOS_ERROR((AE_INFO,
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"The DSDT has been corrupted or replaced - "
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"old, new headers below"));
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acpi_tb_print_table_header(0, &acpi_gbl_original_dsdt_header);
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acpi_tb_print_table_header(0, acpi_gbl_DSDT);
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ACPI_ERROR((AE_INFO,
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"Please send DMI info to linux-acpi@vger.kernel.org\n"
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"If system does not work as expected, please boot with acpi=copy_dsdt"));
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/* Disable further error messages */
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acpi_gbl_original_dsdt_header.length = acpi_gbl_DSDT->length;
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acpi_gbl_original_dsdt_header.checksum =
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acpi_gbl_DSDT->checksum;
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_copy_dsdt
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*
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* PARAMETERS: table_desc - Installed table to copy
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*
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* RETURN: None
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*
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* DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory.
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* Some very bad BIOSs are known to either corrupt the DSDT or
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* install a new, bad DSDT. This copy works around the problem.
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*
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******************************************************************************/
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struct acpi_table_header *acpi_tb_copy_dsdt(u32 table_index)
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{
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struct acpi_table_header *new_table;
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struct acpi_table_desc *table_desc;
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table_desc = &acpi_gbl_root_table_list.tables[table_index];
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new_table = ACPI_ALLOCATE(table_desc->length);
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if (!new_table) {
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ACPI_ERROR((AE_INFO, "Could not copy DSDT of length 0x%X",
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table_desc->length));
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return (NULL);
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}
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ACPI_MEMCPY(new_table, table_desc->pointer, table_desc->length);
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acpi_tb_delete_table(table_desc);
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table_desc->pointer = new_table;
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table_desc->flags = ACPI_TABLE_ORIGIN_ALLOCATED;
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ACPI_INFO((AE_INFO,
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"Forced DSDT copy: length 0x%05X copied locally, original unmapped",
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new_table->length));
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return (new_table);
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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 called 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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struct acpi_table_header *table;
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struct acpi_table_header *final_table;
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struct acpi_table_desc *table_desc;
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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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table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
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if (!table) {
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ACPI_ERROR((AE_INFO,
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"Could not map memory for table [%s] at %p",
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signature, ACPI_CAST_PTR(void, address)));
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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(table->signature, signature)) {
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ACPI_BIOS_ERROR((AE_INFO,
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"Invalid signature 0x%X for ACPI table, expected [%s]",
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*ACPI_CAST_PTR(u32, 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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* Initialize the table entry. Set the pointer to NULL, since the
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* table is not fully mapped at this time.
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*/
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table_desc = &acpi_gbl_root_table_list.tables[table_index];
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table_desc->address = address;
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table_desc->pointer = NULL;
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table_desc->length = table->length;
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table_desc->flags = ACPI_TABLE_ORIGIN_MAPPED;
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ACPI_MOVE_32_TO_32(table_desc->signature.ascii, table->signature);
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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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* NOTE: If the table is overridden, then final_table will contain a
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* mapped pointer to the full new table. If the table is not overridden,
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* or if there has been a physical override, then the table will be
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* fully mapped later (in verify table). In any case, we must
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* unmap the header that was mapped above.
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*/
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final_table = acpi_tb_table_override(table, table_desc);
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if (!final_table) {
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final_table = table; /* There was no override */
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}
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acpi_tb_print_table_header(table_desc->address, final_table);
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/* Set the global integer width (based upon revision of the DSDT) */
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if (table_index == ACPI_TABLE_INDEX_DSDT) {
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acpi_ut_set_integer_width(final_table->revision);
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}
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/*
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* If we have a physical override during this early loading of the ACPI
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* tables, unmap the table for now. It will be mapped again later when
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* it is actually used. This supports very early loading of ACPI tables,
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* before virtual memory is fully initialized and running within the
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* host OS. Note: A logical override has the ACPI_TABLE_ORIGIN_OVERRIDE
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* flag set and will not be deleted below.
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*/
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if (final_table != table) {
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acpi_tb_delete_table(table_desc);
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}
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unmap_and_exit:
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/* Always unmap the table header that we mapped above */
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acpi_os_unmap_memory(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 == ACPI_RSDT_ENTRY_SIZE) {
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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_BIOS_WARNING((AE_INFO,
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"64-bit Physical Address in XSDT is too large (0x%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_validate_xsdt
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*
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* PARAMETERS: address - Physical address of the XSDT (from RSDP)
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*
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* RETURN: Status. AE_OK if the table appears to be valid.
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*
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* DESCRIPTION: Validate an XSDT to ensure that it is of minimum size and does
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* not contain any NULL entries. A problem that is seen in the
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* field is that the XSDT exists, but is actually useless because
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* of one or more (or all) NULL entries.
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*
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******************************************************************************/
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static acpi_status acpi_tb_validate_xsdt(acpi_physical_address xsdt_address)
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{
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struct acpi_table_header *table;
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u8 *next_entry;
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acpi_physical_address address;
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u32 length;
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u32 entry_count;
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acpi_status status;
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u32 i;
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/* Get the XSDT length */
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table =
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acpi_os_map_memory(xsdt_address, sizeof(struct acpi_table_header));
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if (!table) {
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return (AE_NO_MEMORY);
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}
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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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/*
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* Minimum XSDT length is the size of the standard ACPI header
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* plus one physical address entry
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*/
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if (length < (sizeof(struct acpi_table_header) + ACPI_XSDT_ENTRY_SIZE)) {
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return (AE_INVALID_TABLE_LENGTH);
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}
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/* Map the entire XSDT */
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table = acpi_os_map_memory(xsdt_address, length);
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if (!table) {
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return (AE_NO_MEMORY);
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}
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/* Get the number of entries and pointer to first entry */
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status = AE_OK;
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next_entry = ACPI_ADD_PTR(u8, table, sizeof(struct acpi_table_header));
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entry_count = (u32)((table->length - sizeof(struct acpi_table_header)) /
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ACPI_XSDT_ENTRY_SIZE);
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/* Validate each entry (physical address) within the XSDT */
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for (i = 0; i < entry_count; i++) {
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address =
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acpi_tb_get_root_table_entry(next_entry,
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ACPI_XSDT_ENTRY_SIZE);
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if (!address) {
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/* Detected a NULL entry, XSDT is invalid */
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status = AE_NULL_ENTRY;
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break;
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}
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next_entry += ACPI_XSDT_ENTRY_SIZE;
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}
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/* Unmap table */
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acpi_os_unmap_memory(table, length);
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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_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 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;
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struct acpi_table_header *table;
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acpi_physical_address address;
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u32 length;
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u8 *table_entry;
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acpi_status status;
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ACPI_FUNCTION_TRACE(tb_parse_root_table);
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/* Map the entire RSDP and extract the address of the RSDT or XSDT */
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rsdp = acpi_os_map_memory(rsdp_address, sizeof(struct acpi_table_rsdp));
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if (!rsdp) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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acpi_tb_print_table_header(rsdp_address,
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ACPI_CAST_PTR(struct acpi_table_header,
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rsdp));
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/* Use XSDT if present and not overridden. Otherwise, use RSDT */
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if ((rsdp->revision > 1) &&
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rsdp->xsdt_physical_address && !acpi_gbl_do_not_use_xsdt) {
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/*
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* RSDP contains an XSDT (64-bit physical addresses). We must use
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* the XSDT if the revision is > 1 and the XSDT pointer is present,
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* as per the ACPI specification.
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*/
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address = (acpi_physical_address) rsdp->xsdt_physical_address;
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table_entry_size = ACPI_XSDT_ENTRY_SIZE;
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} else {
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/* Root table is an RSDT (32-bit physical addresses) */
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address = (acpi_physical_address) rsdp->rsdt_physical_address;
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table_entry_size = ACPI_RSDT_ENTRY_SIZE;
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}
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/*
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* It is not possible to map more than one entry in some environments,
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* so unmap the RSDP here before mapping other tables
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*/
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acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp));
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/*
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* If it is present and used, validate the XSDT for access/size
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* and ensure that all table entries are at least non-NULL
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*/
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if (table_entry_size == ACPI_XSDT_ENTRY_SIZE) {
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status = acpi_tb_validate_xsdt(address);
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if (ACPI_FAILURE(status)) {
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ACPI_BIOS_WARNING((AE_INFO,
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"XSDT is invalid (%s), using RSDT",
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acpi_format_exception(status)));
|
|
|
|
/* Fall back to the RSDT */
|
|
|
|
address =
|
|
(acpi_physical_address) rsdp->rsdt_physical_address;
|
|
table_entry_size = ACPI_RSDT_ENTRY_SIZE;
|
|
}
|
|
}
|
|
|
|
/* 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);
|
|
|
|
/*
|
|
* Validate length of the table, and map entire table.
|
|
* Minimum length table must contain at least one entry.
|
|
*/
|
|
length = table->length;
|
|
acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
|
|
|
|
if (length < (sizeof(struct acpi_table_header) + table_entry_size)) {
|
|
ACPI_BIOS_ERROR((AE_INFO,
|
|
"Invalid table 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);
|
|
}
|
|
|
|
/* Get the number of entries and pointer to first entry */
|
|
|
|
table_count = (u32)((table->length - sizeof(struct acpi_table_header)) /
|
|
table_entry_size);
|
|
table_entry = ACPI_ADD_PTR(u8, table, sizeof(struct acpi_table_header));
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
acpi_gbl_root_table_list.current_table_count = 2;
|
|
|
|
/* Initialize the root table array from the RSDT/XSDT */
|
|
|
|
for (i = 0; i < table_count; i++) {
|
|
if (acpi_gbl_root_table_list.current_table_count >=
|
|
acpi_gbl_root_table_list.max_table_count) {
|
|
|
|
/* 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.
|
|
current_table_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.
|
|
current_table_count].address =
|
|
acpi_tb_get_root_table_entry(table_entry, table_entry_size);
|
|
|
|
table_entry += table_entry_size;
|
|
acpi_gbl_root_table_list.current_table_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.current_table_count; i++) {
|
|
acpi_tb_install_table(acpi_gbl_root_table_list.tables[i].
|
|
address, NULL, i);
|
|
|
|
/* Special case for FADT - validate it then 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);
|
|
}
|