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![Lv Zheng](/assets/img/avatar_default.png)
This change adds a runtime option that will force ACPICA to use the RSDT instead of the XSDT. Although the ACPI spec requires that an XSDT be used instead of the RSDT, the XSDT has been found to be corrupt or ill-formed on some machines. This option is already in the Linux kernel. When it is back ported to ACPICA, code is re-written to follow ACPICA coding style. This patch is the generation of the integration. Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
627 lines
19 KiB
C
627 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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*/
|
|
acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp));
|
|
|
|
/*
|
|
* If it is present and used, validate the XSDT for access/size
|
|
* and ensure that all table entries are at least non-NULL
|
|
*/
|
|
if (table_entry_size == ACPI_XSDT_ENTRY_SIZE) {
|
|
status = acpi_tb_validate_xsdt(address);
|
|
if (ACPI_FAILURE(status)) {
|
|
ACPI_BIOS_WARNING((AE_INFO,
|
|
"XSDT is invalid (%s), using RSDT",
|
|
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);
|
|
}
|