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446 lines
13 KiB
446 lines
13 KiB
// 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 [email protected]\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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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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