diff options
Diffstat (limited to 'kernel/drivers/acpi/acpica/tbutils.c')
| -rw-r--r-- | kernel/drivers/acpi/acpica/tbutils.c | 401 |
1 files changed, 401 insertions, 0 deletions
diff --git a/kernel/drivers/acpi/acpica/tbutils.c b/kernel/drivers/acpi/acpica/tbutils.c new file mode 100644 index 000000000..6559a5843 --- /dev/null +++ b/kernel/drivers/acpi/acpica/tbutils.c @@ -0,0 +1,401 @@ +/****************************************************************************** + * + * Module Name: tbutils - ACPI Table utilities + * + *****************************************************************************/ + +/* + * Copyright (C) 2000 - 2015, 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) +{ + acpi_status status; + + /* If Hardware Reduced flag is set, there is no FACS */ + + if (acpi_gbl_reduced_hardware) { + acpi_gbl_FACS = NULL; + return (AE_OK); + } + + status = acpi_get_table_by_index(ACPI_TABLE_INDEX_FACS, + ACPI_CAST_INDIRECT_PTR(struct + acpi_table_header, + &acpi_gbl_FACS)); + return (status); +} +#endif /* !ACPI_REDUCED_HARDWARE */ + +/******************************************************************************* + * + * FUNCTION: acpi_tb_tables_loaded + * + * PARAMETERS: None + * + * RETURN: TRUE if required ACPI tables are loaded + * + * DESCRIPTION: Determine if the minimum required ACPI tables are present + * (FADT, FACS, DSDT) + * + ******************************************************************************/ + +u8 acpi_tb_tables_loaded(void) +{ + + if (acpi_gbl_root_table_list.current_table_count >= 3) { + return (TRUE); + } + + return (FALSE); +} + +/******************************************************************************* + * + * 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); + } + + ACPI_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_TABLE_INDEX_DSDT], + ACPI_PTR_TO_PHYSADDR(new_table), + ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL, + new_table); + + ACPI_INFO((AE_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)); + + /* + * 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++) { + + /* 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_tb_parse_fadt(table_index); + } + +next_table: + + table_entry += table_entry_size; + } + + acpi_os_unmap_memory(table, length); + + return_ACPI_STATUS(AE_OK); +} |