diff options
Diffstat (limited to 'drivers/acpi/acpica/tbutils.c')
| -rw-r--r-- | drivers/acpi/acpica/tbutils.c | 441 |
1 files changed, 111 insertions, 330 deletions
diff --git a/drivers/acpi/acpica/tbutils.c b/drivers/acpi/acpica/tbutils.c index ef7d2c2d8f0..6b1ca9991b9 100644 --- a/drivers/acpi/acpica/tbutils.c +++ b/drivers/acpi/acpica/tbutils.c @@ -1,11 +1,11 @@ /****************************************************************************** * - * Module Name: tbutils - table utilities + * Module Name: tbutils - ACPI Table utilities * *****************************************************************************/ /* - * Copyright (C) 2000 - 2008, Intel Corp. + * Copyright (C) 2000 - 2014, Intel Corp. * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -52,66 +52,7 @@ ACPI_MODULE_NAME("tbutils") static acpi_physical_address acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size); -/******************************************************************************* - * - * FUNCTION: acpi_tb_check_xsdt - * - * PARAMETERS: address - Pointer to the XSDT - * - * RETURN: status - * AE_OK - XSDT is okay - * AE_NO_MEMORY - can't map XSDT - * AE_INVALID_TABLE_LENGTH - invalid table length - * AE_NULL_ENTRY - XSDT has NULL entry - * - * DESCRIPTION: validate XSDT -******************************************************************************/ - -static acpi_status -acpi_tb_check_xsdt(acpi_physical_address address) -{ - struct acpi_table_header *table; - u32 length; - u64 xsdt_entry_address; - u8 *table_entry; - u32 table_count; - int i; - - table = acpi_os_map_memory(address, sizeof(struct acpi_table_header)); - if (!table) - return AE_NO_MEMORY; - - length = table->length; - acpi_os_unmap_memory(table, sizeof(struct acpi_table_header)); - if (length < sizeof(struct acpi_table_header)) - return AE_INVALID_TABLE_LENGTH; - - table = acpi_os_map_memory(address, length); - if (!table) - return AE_NO_MEMORY; - - /* Calculate the number of tables described in XSDT */ - table_count = - (u32) ((table->length - - sizeof(struct acpi_table_header)) / sizeof(u64)); - table_entry = - ACPI_CAST_PTR(u8, table) + sizeof(struct acpi_table_header); - for (i = 0; i < table_count; i++) { - ACPI_MOVE_64_TO_64(&xsdt_entry_address, table_entry); - if (!xsdt_entry_address) { - /* XSDT has NULL entry */ - break; - } - table_entry += sizeof(u64); - } - acpi_os_unmap_memory(table, length); - - if (i < table_count) - return AE_NULL_ENTRY; - else - return AE_OK; -} - +#if (!ACPI_REDUCED_HARDWARE) /******************************************************************************* * * FUNCTION: acpi_tb_initialize_facs @@ -129,12 +70,20 @@ 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; + return (status); } +#endif /* !ACPI_REDUCED_HARDWARE */ /******************************************************************************* * @@ -152,7 +101,7 @@ acpi_status acpi_tb_initialize_facs(void) u8 acpi_tb_tables_loaded(void) { - if (acpi_gbl_root_table_list.count >= 3) { + if (acpi_gbl_root_table_list.current_table_count >= 3) { return (TRUE); } @@ -161,224 +110,85 @@ u8 acpi_tb_tables_loaded(void) /******************************************************************************* * - * FUNCTION: acpi_tb_print_table_header + * FUNCTION: acpi_tb_check_dsdt_header * - * PARAMETERS: Address - Table physical address - * Header - Table header + * PARAMETERS: None * * RETURN: None * - * DESCRIPTION: Print an ACPI table header. Special cases for FACS and RSDP. + * 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_print_table_header(acpi_physical_address address, - struct acpi_table_header *header) +void acpi_tb_check_dsdt_header(void) { - /* - * The reason that the Address is cast to a void pointer is so that we - * can use %p which will work properly on both 32-bit and 64-bit hosts. - */ - if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_FACS)) { - - /* FACS only has signature and length fields */ - - ACPI_INFO((AE_INFO, "%4.4s %p %05X", - header->signature, ACPI_CAST_PTR(void, address), - header->length)); - } else if (ACPI_COMPARE_NAME(header->signature, ACPI_SIG_RSDP)) { - - /* RSDP has no common fields */ - - ACPI_INFO((AE_INFO, "RSDP %p %05X (v%.2d %6.6s)", - ACPI_CAST_PTR (void, address), - (ACPI_CAST_PTR(struct acpi_table_rsdp, header)-> - revision > - 0) ? ACPI_CAST_PTR(struct acpi_table_rsdp, - header)->length : 20, - ACPI_CAST_PTR(struct acpi_table_rsdp, - header)->revision, - ACPI_CAST_PTR(struct acpi_table_rsdp, - header)->oem_id)); - } else { - /* Standard ACPI table with full common header */ - - ACPI_INFO((AE_INFO, - "%4.4s %p %05X (v%.2d %6.6s %8.8s %08X %4.4s %08X)", - header->signature, ACPI_CAST_PTR (void, address), - header->length, header->revision, header->oem_id, - header->oem_table_id, header->oem_revision, - header->asl_compiler_id, - header->asl_compiler_revision)); - } -} + /* Compare original length and checksum to current values */ -/******************************************************************************* - * - * FUNCTION: acpi_tb_validate_checksum - * - * PARAMETERS: Table - ACPI table to verify - * Length - Length of entire table - * - * RETURN: Status - * - * DESCRIPTION: Verifies that the table checksums to zero. Optionally returns - * exception on bad checksum. - * - ******************************************************************************/ + 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_status acpi_tb_verify_checksum(struct acpi_table_header *table, u32 length) -{ - u8 checksum; - - /* Compute the checksum on the table */ - - checksum = acpi_tb_checksum(ACPI_CAST_PTR(u8, table), length); - - /* Checksum ok? (should be zero) */ - - if (checksum) { - ACPI_WARNING((AE_INFO, - "Incorrect checksum in table [%4.4s] - %2.2X, should be %2.2X", - table->signature, table->checksum, - (u8) (table->checksum - checksum))); - -#if (ACPI_CHECKSUM_ABORT) - - return (AE_BAD_CHECKSUM); -#endif - } - - return (AE_OK); -} - -/******************************************************************************* - * - * FUNCTION: acpi_tb_checksum - * - * PARAMETERS: Buffer - Pointer to memory region to be checked - * Length - Length of this memory region - * - * RETURN: Checksum (u8) - * - * DESCRIPTION: Calculates circular checksum of memory region. - * - ******************************************************************************/ + 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")); -u8 acpi_tb_checksum(u8 *buffer, u32 length) -{ - u8 sum = 0; - u8 *end = buffer + length; + /* Disable further error messages */ - while (buffer < end) { - sum = (u8) (sum + *(buffer++)); + acpi_gbl_original_dsdt_header.length = acpi_gbl_DSDT->length; + acpi_gbl_original_dsdt_header.checksum = + acpi_gbl_DSDT->checksum; } - - return sum; } /******************************************************************************* * - * FUNCTION: acpi_tb_install_table + * FUNCTION: acpi_tb_copy_dsdt * - * PARAMETERS: Address - Physical address of DSDT or FACS - * Signature - Table signature, NULL if no need to - * match - * table_index - Index into root table array + * PARAMETERS: table_desc - Installed table to copy * * RETURN: None * - * DESCRIPTION: Install an ACPI table into the global data structure. The - * table override mechanism is implemented here to allow the host - * OS to replace any table before it is installed in the root - * table array. + * 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. * ******************************************************************************/ -void -acpi_tb_install_table(acpi_physical_address address, - char *signature, u32 table_index) +struct acpi_table_header *acpi_tb_copy_dsdt(u32 table_index) { - u8 flags; - acpi_status status; - struct acpi_table_header *table_to_install; - struct acpi_table_header *mapped_table; - struct acpi_table_header *override_table = NULL; - - if (!address) { - ACPI_ERROR((AE_INFO, - "Null physical address for ACPI table [%s]", - signature)); - return; - } - - /* Map just the table header */ + struct acpi_table_header *new_table; + struct acpi_table_desc *table_desc; - mapped_table = - acpi_os_map_memory(address, sizeof(struct acpi_table_header)); - if (!mapped_table) { - return; - } - - /* If a particular signature is expected (DSDT/FACS), it must match */ + table_desc = &acpi_gbl_root_table_list.tables[table_index]; - if (signature && !ACPI_COMPARE_NAME(mapped_table->signature, signature)) { - ACPI_ERROR((AE_INFO, - "Invalid signature 0x%X for ACPI table, expected [%s]", - *ACPI_CAST_PTR(u32, mapped_table->signature), - signature)); - goto unmap_and_exit; - } - - /* - * ACPI Table Override: - * - * Before we install the table, let the host OS override it with a new - * one if desired. Any table within the RSDT/XSDT can be replaced, - * including the DSDT which is pointed to by the FADT. - */ - status = acpi_os_table_override(mapped_table, &override_table); - if (ACPI_SUCCESS(status) && override_table) { - ACPI_INFO((AE_INFO, - "%4.4s @ 0x%p Table override, replaced with:", - mapped_table->signature, ACPI_CAST_PTR(void, - address))); - - acpi_gbl_root_table_list.tables[table_index].pointer = - override_table; - address = ACPI_PTR_TO_PHYSADDR(override_table); - - table_to_install = override_table; - flags = ACPI_TABLE_ORIGIN_OVERRIDE; - } else { - table_to_install = mapped_table; - flags = ACPI_TABLE_ORIGIN_MAPPED; + 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); } - /* Initialize the table entry */ - - acpi_gbl_root_table_list.tables[table_index].address = address; - acpi_gbl_root_table_list.tables[table_index].length = - table_to_install->length; - acpi_gbl_root_table_list.tables[table_index].flags = flags; - - ACPI_MOVE_32_TO_32(& - (acpi_gbl_root_table_list.tables[table_index]. - signature), table_to_install->signature); - - acpi_tb_print_table_header(address, table_to_install); + ACPI_MEMCPY(new_table, table_desc->pointer, table_desc->length); + acpi_tb_uninstall_table(table_desc); - if (table_index == ACPI_TABLE_INDEX_DSDT) { + 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); - /* Global integer width is based upon revision of the DSDT */ + ACPI_INFO((AE_INFO, + "Forced DSDT copy: length 0x%05X copied locally, original unmapped", + new_table->length)); - acpi_ut_set_integer_width(table_to_install->revision); - } - - unmap_and_exit: - acpi_os_unmap_memory(mapped_table, sizeof(struct acpi_table_header)); + return (new_table); } /******************************************************************************* @@ -407,7 +217,7 @@ acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size) * 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 == sizeof(u32)) { + 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 @@ -427,10 +237,10 @@ acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size) /* Will truncate 64-bit address to 32 bits, issue warning */ - ACPI_WARNING((AE_INFO, - "64-bit Physical Address in XSDT is too large (%8.8X%8.8X)," - " truncating", - ACPI_FORMAT_UINT64(address64))); + 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)); @@ -441,7 +251,7 @@ acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size) * * FUNCTION: acpi_tb_parse_root_table * - * PARAMETERS: Rsdp - Pointer to the RSDP + * PARAMETERS: rsdp - Pointer to the RSDP * * RETURN: Status * @@ -454,8 +264,7 @@ acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size) * ******************************************************************************/ -acpi_status __init -acpi_tb_parse_root_table(acpi_physical_address rsdp_address) +acpi_status __init acpi_tb_parse_root_table(acpi_physical_address rsdp_address) { struct acpi_table_rsdp *rsdp; u32 table_entry_size; @@ -463,16 +272,15 @@ acpi_tb_parse_root_table(acpi_physical_address rsdp_address) u32 table_count; struct acpi_table_header *table; acpi_physical_address address; - acpi_physical_address uninitialized_var(rsdt_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 - */ + /* 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); @@ -482,24 +290,22 @@ acpi_tb_parse_root_table(acpi_physical_address rsdp_address) ACPI_CAST_PTR(struct acpi_table_header, rsdp)); - /* Differentiate between RSDT and XSDT root tables */ + /* Use XSDT if present and not overridden. Otherwise, use RSDT */ - if (rsdp->revision > 1 && rsdp->xsdt_physical_address - && !acpi_rsdt_forced) { + if ((rsdp->revision > 1) && + rsdp->xsdt_physical_address && !acpi_gbl_do_not_use_xsdt) { /* - * Root table is 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. + * 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 = sizeof(u64); - rsdt_address = (acpi_physical_address) - rsdp->rsdt_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 = sizeof(u32); + table_entry_size = ACPI_RSDT_ENTRY_SIZE; } /* @@ -508,15 +314,6 @@ acpi_tb_parse_root_table(acpi_physical_address rsdp_address) */ acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp)); - if (table_entry_size == sizeof(u64)) { - if (acpi_tb_check_xsdt(address) == AE_NULL_ENTRY) { - /* XSDT has NULL entry, RSDT is used */ - address = rsdt_address; - table_entry_size = sizeof(u32); - ACPI_WARNING((AE_INFO, "BIOS XSDT has NULL entry, " - "using RSDT")); - } - } /* Map the RSDT/XSDT table header to get the full table length */ table = acpi_os_map_memory(address, sizeof(struct acpi_table_header)); @@ -526,14 +323,17 @@ acpi_tb_parse_root_table(acpi_physical_address rsdp_address) acpi_tb_print_table_header(address, table); - /* Get the length of the full table, verify length and map entire 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)) { - ACPI_ERROR((AE_INFO, "Invalid length 0x%X in RSDT/XSDT", - length)); + 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); } @@ -550,71 +350,52 @@ acpi_tb_parse_root_table(acpi_physical_address rsdp_address) return_ACPI_STATUS(status); } - /* Calculate the number of tables described in the root table */ + /* 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 */ - table_entry = - ACPI_CAST_PTR(u8, table) + sizeof(struct acpi_table_header); - acpi_gbl_root_table_list.count = 2; + acpi_gbl_root_table_list.current_table_count = 2; + + /* Initialize the root table array from the RSDT/XSDT */ - /* - * Initialize the root table array from the RSDT/XSDT - */ for (i = 0; i < table_count; i++) { - if (acpi_gbl_root_table_list.count >= - acpi_gbl_root_table_list.size) { - - /* 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. - 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.count]. - address = + address = acpi_tb_get_root_table_entry(table_entry, table_entry_size); - table_entry += table_entry_size; - acpi_gbl_root_table_list.count++; - } + /* Skip NULL entries in RSDT/XSDT */ - /* - * 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.count; i++) { - acpi_tb_install_table(acpi_gbl_root_table_list.tables[i]. - address, NULL, i); + if (!address) { + goto next_table; + } - /* Special case for FADT - get the DSDT and FACS */ + status = acpi_tb_install_standard_table(address, + ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL, + FALSE, TRUE, + &table_index); - if (ACPI_COMPARE_NAME - (&acpi_gbl_root_table_list.tables[i].signature, - ACPI_SIG_FADT)) { - acpi_tb_parse_fadt(i); + 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); } |