447 строки
13 KiB
C
447 строки
13 KiB
C
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: tbutils - ACPI Table utilities
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*
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* Copyright (C) 2000 - 2021, Intel Corp.
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*
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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_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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struct acpi_table_facs *facs;
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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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} else if (acpi_gbl_FADT.Xfacs &&
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(!acpi_gbl_FADT.facs
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|| !acpi_gbl_use32_bit_facs_addresses)) {
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(void)acpi_get_table_by_index(acpi_gbl_xfacs_index,
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ACPI_CAST_INDIRECT_PTR(struct
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acpi_table_header,
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&facs));
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acpi_gbl_FACS = facs;
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} else if (acpi_gbl_FADT.facs) {
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(void)acpi_get_table_by_index(acpi_gbl_facs_index,
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ACPI_CAST_INDIRECT_PTR(struct
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acpi_table_header,
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&facs));
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acpi_gbl_FACS = facs;
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}
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/* If there is no FACS, just continue. There was already an error msg */
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return (AE_OK);
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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_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_index - Index of installed table to copy
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*
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* RETURN: The copied DSDT
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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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memcpy(new_table, table_desc->pointer, table_desc->length);
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acpi_tb_uninstall_table(table_desc);
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acpi_tb_init_table_descriptor(&acpi_gbl_root_table_list.
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tables[acpi_gbl_dsdt_index],
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ACPI_PTR_TO_PHYSADDR(new_table),
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ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL,
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new_table);
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ACPI_INFO(("Forced DSDT copy: length 0x%05X copied locally, original unmapped", 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_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_parse_root_table
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*
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* PARAMETERS: rsdp_address - 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 ACPI_INIT_FUNCTION
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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;
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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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u32 table_index;
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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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/* Map the RSDT/XSDT table header to get the full table length */
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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_ACPI_STATUS(AE_NO_MEMORY);
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}
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acpi_tb_print_table_header(address, table);
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/*
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* Validate length of the table, and map entire table.
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* Minimum length table must contain at least one entry.
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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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if (length < (sizeof(struct acpi_table_header) + table_entry_size)) {
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ACPI_BIOS_ERROR((AE_INFO,
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"Invalid table length 0x%X in RSDT/XSDT",
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length));
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return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH);
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}
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table = acpi_os_map_memory(address, length);
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if (!table) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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/* Validate the root table checksum */
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status = acpi_tb_verify_checksum(table, length);
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if (ACPI_FAILURE(status)) {
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acpi_os_unmap_memory(table, length);
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return_ACPI_STATUS(status);
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}
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/* Get the number of entries and pointer to first entry */
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table_count = (u32)((table->length - sizeof(struct acpi_table_header)) /
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table_entry_size);
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table_entry = ACPI_ADD_PTR(u8, table, sizeof(struct acpi_table_header));
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/* Initialize the root table array from the RSDT/XSDT */
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for (i = 0; i < table_count; i++) {
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/* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */
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address =
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acpi_tb_get_root_table_entry(table_entry, table_entry_size);
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/* Skip NULL entries in RSDT/XSDT */
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if (!address) {
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goto next_table;
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}
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status = acpi_tb_install_standard_table(address,
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ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL,
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NULL, FALSE, TRUE,
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&table_index);
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if (ACPI_SUCCESS(status) &&
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ACPI_COMPARE_NAMESEG(&acpi_gbl_root_table_list.
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tables[table_index].signature,
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ACPI_SIG_FADT)) {
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acpi_gbl_fadt_index = table_index;
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acpi_tb_parse_fadt();
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}
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next_table:
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table_entry += table_entry_size;
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}
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acpi_os_unmap_memory(table, length);
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_get_table
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*
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* PARAMETERS: table_desc - Table descriptor
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* out_table - Where the pointer to the table is returned
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*
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* RETURN: Status and pointer to the requested table
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*
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* DESCRIPTION: Increase a reference to a table descriptor and return the
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* validated table pointer.
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* If the table descriptor is an entry of the root table list,
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* this API must be invoked with ACPI_MTX_TABLES acquired.
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*
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******************************************************************************/
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acpi_status
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acpi_tb_get_table(struct acpi_table_desc *table_desc,
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struct acpi_table_header **out_table)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE(acpi_tb_get_table);
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if (table_desc->validation_count == 0) {
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/* Table need to be "VALIDATED" */
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status = acpi_tb_validate_table(table_desc);
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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}
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if (table_desc->validation_count < ACPI_MAX_TABLE_VALIDATIONS) {
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table_desc->validation_count++;
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/*
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* Detect validation_count overflows to ensure that the warning
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* message will only be printed once.
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*/
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if (table_desc->validation_count >= ACPI_MAX_TABLE_VALIDATIONS) {
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ACPI_WARNING((AE_INFO,
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"Table %p, Validation count overflows\n",
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table_desc));
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}
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}
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*out_table = table_desc->pointer;
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_put_table
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*
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* PARAMETERS: table_desc - Table descriptor
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*
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* RETURN: None
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*
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* DESCRIPTION: Decrease a reference to a table descriptor and release the
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* validated table pointer if no references.
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* If the table descriptor is an entry of the root table list,
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* this API must be invoked with ACPI_MTX_TABLES acquired.
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*
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******************************************************************************/
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void acpi_tb_put_table(struct acpi_table_desc *table_desc)
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{
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ACPI_FUNCTION_TRACE(acpi_tb_put_table);
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if (table_desc->validation_count < ACPI_MAX_TABLE_VALIDATIONS) {
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table_desc->validation_count--;
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/*
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* Detect validation_count underflows to ensure that the warning
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* message will only be printed once.
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*/
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if (table_desc->validation_count >= ACPI_MAX_TABLE_VALIDATIONS) {
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ACPI_WARNING((AE_INFO,
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"Table %p, Validation count underflows\n",
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table_desc));
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return_VOID;
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}
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}
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if (table_desc->validation_count == 0) {
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/* Table need to be "INVALIDATED" */
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acpi_tb_invalidate_table(table_desc);
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}
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return_VOID;
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}
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