| /****************************************************************************** |
| * |
| * Module Name: tbutils - ACPI Table utilities |
| * |
| *****************************************************************************/ |
| |
| /* |
| * Copyright (C) 2000 - 2016, Intel Corp. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions, and the following disclaimer, |
| * without modification. |
| * 2. Redistributions in binary form must reproduce at minimum a disclaimer |
| * substantially similar to the "NO WARRANTY" disclaimer below |
| * ("Disclaimer") and any redistribution must be conditioned upon |
| * including a substantially similar Disclaimer requirement for further |
| * binary redistribution. |
| * 3. Neither the names of the above-listed copyright holders nor the names |
| * of any contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * Alternatively, this software may be distributed under the terms of the |
| * GNU General Public License ("GPL") version 2 as published by the Free |
| * Software Foundation. |
| * |
| * NO WARRANTY |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
| * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGES. |
| */ |
| |
| #include <acpi/acpi.h> |
| #include "accommon.h" |
| #include "actables.h" |
| |
| #define _COMPONENT ACPI_TABLES |
| ACPI_MODULE_NAME("tbutils") |
| |
| /* Local prototypes */ |
| static acpi_physical_address |
| acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size); |
| |
| #if (!ACPI_REDUCED_HARDWARE) |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_tb_initialize_facs |
| * |
| * PARAMETERS: None |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: Create a permanent mapping for the FADT and save it in a global |
| * for accessing the Global Lock and Firmware Waking Vector |
| * |
| ******************************************************************************/ |
| |
| acpi_status acpi_tb_initialize_facs(void) |
| { |
| struct acpi_table_facs *facs; |
| |
| /* If Hardware Reduced flag is set, there is no FACS */ |
| |
| if (acpi_gbl_reduced_hardware) { |
| acpi_gbl_FACS = NULL; |
| return (AE_OK); |
| } else if (acpi_gbl_FADT.Xfacs && |
| (!acpi_gbl_FADT.facs |
| || !acpi_gbl_use32_bit_facs_addresses)) { |
| (void)acpi_get_table_by_index(acpi_gbl_xfacs_index, |
| ACPI_CAST_INDIRECT_PTR(struct |
| acpi_table_header, |
| &facs)); |
| acpi_gbl_FACS = facs; |
| } else if (acpi_gbl_FADT.facs) { |
| (void)acpi_get_table_by_index(acpi_gbl_facs_index, |
| ACPI_CAST_INDIRECT_PTR(struct |
| acpi_table_header, |
| &facs)); |
| acpi_gbl_FACS = facs; |
| } |
| |
| /* If there is no FACS, just continue. There was already an error msg */ |
| |
| return (AE_OK); |
| } |
| #endif /* !ACPI_REDUCED_HARDWARE */ |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_tb_check_dsdt_header |
| * |
| * PARAMETERS: None |
| * |
| * RETURN: None |
| * |
| * DESCRIPTION: Quick compare to check validity of the DSDT. This will detect |
| * if the DSDT has been replaced from outside the OS and/or if |
| * the DSDT header has been corrupted. |
| * |
| ******************************************************************************/ |
| |
| void acpi_tb_check_dsdt_header(void) |
| { |
| |
| /* Compare original length and checksum to current values */ |
| |
| if (acpi_gbl_original_dsdt_header.length != acpi_gbl_DSDT->length || |
| acpi_gbl_original_dsdt_header.checksum != acpi_gbl_DSDT->checksum) { |
| ACPI_BIOS_ERROR((AE_INFO, |
| "The DSDT has been corrupted or replaced - " |
| "old, new headers below")); |
| |
| acpi_tb_print_table_header(0, &acpi_gbl_original_dsdt_header); |
| acpi_tb_print_table_header(0, acpi_gbl_DSDT); |
| |
| ACPI_ERROR((AE_INFO, |
| "Please send DMI info to linux-acpi@vger.kernel.org\n" |
| "If system does not work as expected, please boot with acpi=copy_dsdt")); |
| |
| /* Disable further error messages */ |
| |
| acpi_gbl_original_dsdt_header.length = acpi_gbl_DSDT->length; |
| acpi_gbl_original_dsdt_header.checksum = |
| acpi_gbl_DSDT->checksum; |
| } |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_tb_copy_dsdt |
| * |
| * PARAMETERS: table_desc - Installed table to copy |
| * |
| * RETURN: None |
| * |
| * DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory. |
| * Some very bad BIOSs are known to either corrupt the DSDT or |
| * install a new, bad DSDT. This copy works around the problem. |
| * |
| ******************************************************************************/ |
| |
| struct acpi_table_header *acpi_tb_copy_dsdt(u32 table_index) |
| { |
| struct acpi_table_header *new_table; |
| struct acpi_table_desc *table_desc; |
| |
| table_desc = &acpi_gbl_root_table_list.tables[table_index]; |
| |
| new_table = ACPI_ALLOCATE(table_desc->length); |
| if (!new_table) { |
| ACPI_ERROR((AE_INFO, "Could not copy DSDT of length 0x%X", |
| table_desc->length)); |
| return (NULL); |
| } |
| |
| memcpy(new_table, table_desc->pointer, table_desc->length); |
| acpi_tb_uninstall_table(table_desc); |
| |
| acpi_tb_init_table_descriptor(&acpi_gbl_root_table_list. |
| tables[acpi_gbl_dsdt_index], |
| ACPI_PTR_TO_PHYSADDR(new_table), |
| ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL, |
| new_table); |
| |
| ACPI_INFO(("Forced DSDT copy: length 0x%05X copied locally, original unmapped", new_table->length)); |
| |
| return (new_table); |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_tb_get_root_table_entry |
| * |
| * PARAMETERS: table_entry - Pointer to the RSDT/XSDT table entry |
| * table_entry_size - sizeof 32 or 64 (RSDT or XSDT) |
| * |
| * RETURN: Physical address extracted from the root table |
| * |
| * DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on |
| * both 32-bit and 64-bit platforms |
| * |
| * NOTE: acpi_physical_address is 32-bit on 32-bit platforms, 64-bit on |
| * 64-bit platforms. |
| * |
| ******************************************************************************/ |
| |
| static acpi_physical_address |
| acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size) |
| { |
| u64 address64; |
| |
| /* |
| * Get the table physical address (32-bit for RSDT, 64-bit for XSDT): |
| * Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT |
| */ |
| if (table_entry_size == ACPI_RSDT_ENTRY_SIZE) { |
| /* |
| * 32-bit platform, RSDT: Return 32-bit table entry |
| * 64-bit platform, RSDT: Expand 32-bit to 64-bit and return |
| */ |
| return ((acpi_physical_address) |
| (*ACPI_CAST_PTR(u32, table_entry))); |
| } else { |
| /* |
| * 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return |
| * 64-bit platform, XSDT: Move (unaligned) 64-bit to local, |
| * return 64-bit |
| */ |
| ACPI_MOVE_64_TO_64(&address64, table_entry); |
| |
| #if ACPI_MACHINE_WIDTH == 32 |
| if (address64 > ACPI_UINT32_MAX) { |
| |
| /* Will truncate 64-bit address to 32 bits, issue warning */ |
| |
| ACPI_BIOS_WARNING((AE_INFO, |
| "64-bit Physical Address in XSDT is too large (0x%8.8X%8.8X)," |
| " truncating", |
| ACPI_FORMAT_UINT64(address64))); |
| } |
| #endif |
| return ((acpi_physical_address)(address64)); |
| } |
| } |
| |
| /******************************************************************************* |
| * |
| * FUNCTION: acpi_tb_parse_root_table |
| * |
| * PARAMETERS: rsdp - Pointer to the RSDP |
| * |
| * RETURN: Status |
| * |
| * DESCRIPTION: This function is called to parse the Root System Description |
| * Table (RSDT or XSDT) |
| * |
| * NOTE: Tables are mapped (not copied) for efficiency. The FACS must |
| * be mapped and cannot be copied because it contains the actual |
| * memory location of the ACPI Global Lock. |
| * |
| ******************************************************************************/ |
| |
| acpi_status __init acpi_tb_parse_root_table(acpi_physical_address rsdp_address) |
| { |
| struct acpi_table_rsdp *rsdp; |
| u32 table_entry_size; |
| u32 i; |
| u32 table_count; |
| struct acpi_table_header *table; |
| acpi_physical_address address; |
| u32 length; |
| u8 *table_entry; |
| acpi_status status; |
| u32 table_index; |
| |
| ACPI_FUNCTION_TRACE(tb_parse_root_table); |
| |
| /* Map the entire RSDP and extract the address of the RSDT or XSDT */ |
| |
| rsdp = acpi_os_map_memory(rsdp_address, sizeof(struct acpi_table_rsdp)); |
| if (!rsdp) { |
| return_ACPI_STATUS(AE_NO_MEMORY); |
| } |
| |
| acpi_tb_print_table_header(rsdp_address, |
| ACPI_CAST_PTR(struct acpi_table_header, |
| rsdp)); |
| |
| /* Use XSDT if present and not overridden. Otherwise, use RSDT */ |
| |
| if ((rsdp->revision > 1) && |
| rsdp->xsdt_physical_address && !acpi_gbl_do_not_use_xsdt) { |
| /* |
| * RSDP contains an XSDT (64-bit physical addresses). We must use |
| * the XSDT if the revision is > 1 and the XSDT pointer is present, |
| * as per the ACPI specification. |
| */ |
| address = (acpi_physical_address)rsdp->xsdt_physical_address; |
| table_entry_size = ACPI_XSDT_ENTRY_SIZE; |
| } else { |
| /* Root table is an RSDT (32-bit physical addresses) */ |
| |
| address = (acpi_physical_address)rsdp->rsdt_physical_address; |
| table_entry_size = ACPI_RSDT_ENTRY_SIZE; |
| } |
| |
| /* |
| * It is not possible to map more than one entry in some environments, |
| * so unmap the RSDP here before mapping other tables |
| */ |
| acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp)); |
| |
| /* 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)); |
| |
| /* Initialize the root table array from the RSDT/XSDT */ |
| |
| for (i = 0; i < table_count; i++) { |
| |
| /* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */ |
| |
| address = |
| acpi_tb_get_root_table_entry(table_entry, table_entry_size); |
| |
| /* Skip NULL entries in RSDT/XSDT */ |
| |
| if (!address) { |
| goto next_table; |
| } |
| |
| status = acpi_tb_install_standard_table(address, |
| ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL, |
| FALSE, TRUE, |
| &table_index); |
| |
| if (ACPI_SUCCESS(status) && |
| ACPI_COMPARE_NAME(&acpi_gbl_root_table_list. |
| tables[table_index].signature, |
| ACPI_SIG_FADT)) { |
| acpi_gbl_fadt_index = table_index; |
| acpi_tb_parse_fadt(); |
| } |
| |
| next_table: |
| |
| table_entry += table_entry_size; |
| } |
| |
| acpi_os_unmap_memory(table, length); |
| return_ACPI_STATUS(AE_OK); |
| } |