/****************************************************************************** * * Module Name: tbfadt - FADT table utilities * *****************************************************************************/ /* * Copyright (C) 2000 - 2008, 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 #include "accommon.h" #include "actables.h" #define _COMPONENT ACPI_TABLES ACPI_MODULE_NAME("tbfadt") /* Local prototypes */ static inline void acpi_tb_init_generic_address(struct acpi_generic_address *generic_address, u8 space_id, u8 byte_width, u64 address); static void acpi_tb_convert_fadt(void); static void acpi_tb_validate_fadt(void); /* Table for conversion of FADT to common internal format and FADT validation */ typedef struct acpi_fadt_info { char *name; u8 address64; u8 address32; u8 length; u8 default_length; u8 type; } acpi_fadt_info; #define ACPI_FADT_REQUIRED 1 #define ACPI_FADT_SEPARATE_LENGTH 2 static struct acpi_fadt_info fadt_info_table[] = { {"Pm1aEventBlock", ACPI_FADT_OFFSET(xpm1a_event_block), ACPI_FADT_OFFSET(pm1a_event_block), ACPI_FADT_OFFSET(pm1_event_length), ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */ ACPI_FADT_REQUIRED}, {"Pm1bEventBlock", ACPI_FADT_OFFSET(xpm1b_event_block), ACPI_FADT_OFFSET(pm1b_event_block), ACPI_FADT_OFFSET(pm1_event_length), ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */ 0}, {"Pm1aControlBlock", ACPI_FADT_OFFSET(xpm1a_control_block), ACPI_FADT_OFFSET(pm1a_control_block), ACPI_FADT_OFFSET(pm1_control_length), ACPI_PM1_REGISTER_WIDTH, ACPI_FADT_REQUIRED}, {"Pm1bControlBlock", ACPI_FADT_OFFSET(xpm1b_control_block), ACPI_FADT_OFFSET(pm1b_control_block), ACPI_FADT_OFFSET(pm1_control_length), ACPI_PM1_REGISTER_WIDTH, 0}, {"Pm2ControlBlock", ACPI_FADT_OFFSET(xpm2_control_block), ACPI_FADT_OFFSET(pm2_control_block), ACPI_FADT_OFFSET(pm2_control_length), ACPI_PM2_REGISTER_WIDTH, ACPI_FADT_SEPARATE_LENGTH}, {"PmTimerBlock", ACPI_FADT_OFFSET(xpm_timer_block), ACPI_FADT_OFFSET(pm_timer_block), ACPI_FADT_OFFSET(pm_timer_length), ACPI_PM_TIMER_WIDTH, ACPI_FADT_REQUIRED}, {"Gpe0Block", ACPI_FADT_OFFSET(xgpe0_block), ACPI_FADT_OFFSET(gpe0_block), ACPI_FADT_OFFSET(gpe0_block_length), 0, ACPI_FADT_SEPARATE_LENGTH}, {"Gpe1Block", ACPI_FADT_OFFSET(xgpe1_block), ACPI_FADT_OFFSET(gpe1_block), ACPI_FADT_OFFSET(gpe1_block_length), 0, ACPI_FADT_SEPARATE_LENGTH} }; #define ACPI_FADT_INFO_ENTRIES (sizeof (fadt_info_table) / sizeof (struct acpi_fadt_info)) /******************************************************************************* * * FUNCTION: acpi_tb_init_generic_address * * PARAMETERS: generic_address - GAS struct to be initialized * byte_width - Width of this register * Address - Address of the register * * RETURN: None * * DESCRIPTION: Initialize a Generic Address Structure (GAS) * See the ACPI specification for a full description and * definition of this structure. * ******************************************************************************/ static inline void acpi_tb_init_generic_address(struct acpi_generic_address *generic_address, u8 space_id, u8 byte_width, u64 address) { /* * The 64-bit Address field is non-aligned in the byte packed * GAS struct. */ ACPI_MOVE_64_TO_64(&generic_address->address, &address); /* All other fields are byte-wide */ generic_address->space_id = space_id; generic_address->bit_width = (u8)ACPI_MUL_8(byte_width); generic_address->bit_offset = 0; generic_address->access_width = 0; /* Access width ANY */ } /******************************************************************************* * * FUNCTION: acpi_tb_parse_fadt * * PARAMETERS: table_index - Index for the FADT * Flags - Flags * * RETURN: None * * DESCRIPTION: Initialize the FADT, DSDT and FACS tables * (FADT contains the addresses of the DSDT and FACS) * ******************************************************************************/ void acpi_tb_parse_fadt(u32 table_index, u8 flags) { u32 length; struct acpi_table_header *table; /* * The FADT has multiple versions with different lengths, * and it contains pointers to both the DSDT and FACS tables. * * Get a local copy of the FADT and convert it to a common format * Map entire FADT, assumed to be smaller than one page. */ length = acpi_gbl_root_table_list.tables[table_index].length; table = acpi_os_map_memory(acpi_gbl_root_table_list.tables[table_index]. address, length); if (!table) { return; } /* * Validate the FADT checksum before we copy the table. Ignore * checksum error as we want to try to get the DSDT and FACS. */ (void)acpi_tb_verify_checksum(table, length); /* Obtain a local copy of the FADT in common ACPI 2.0+ format */ acpi_tb_create_local_fadt(table, length); /* All done with the real FADT, unmap it */ acpi_os_unmap_memory(table, length); /* Obtain the DSDT and FACS tables via their addresses within the FADT */ acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xdsdt, flags, ACPI_SIG_DSDT, ACPI_TABLE_INDEX_DSDT); acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xfacs, flags, ACPI_SIG_FACS, ACPI_TABLE_INDEX_FACS); } /******************************************************************************* * * FUNCTION: acpi_tb_create_local_fadt * * PARAMETERS: Table - Pointer to BIOS FADT * Length - Length of the table * * RETURN: None * * DESCRIPTION: Get a local copy of the FADT and convert it to a common format. * Performs validation on some important FADT fields. * * NOTE: We create a local copy of the FADT regardless of the version. * ******************************************************************************/ void acpi_tb_create_local_fadt(struct acpi_table_header *table, u32 length) { /* * Check if the FADT is larger than the largest table that we expect * (the ACPI 2.0/3.0 version). If so, truncate the table, and issue * a warning. */ if (length > sizeof(struct acpi_table_fadt)) { ACPI_WARNING((AE_INFO, "FADT (revision %u) is longer than ACPI 2.0 version, " "truncating length 0x%X to 0x%zX", table->revision, (unsigned)length, sizeof(struct acpi_table_fadt))); } /* Clear the entire local FADT */ ACPI_MEMSET(&acpi_gbl_FADT, 0, sizeof(struct acpi_table_fadt)); /* Copy the original FADT, up to sizeof (struct acpi_table_fadt) */ ACPI_MEMCPY(&acpi_gbl_FADT, table, ACPI_MIN(length, sizeof(struct acpi_table_fadt))); /* * 1) Convert the local copy of the FADT to the common internal format * 2) Validate some of the important values within the FADT */ acpi_tb_convert_fadt(); } /******************************************************************************* * * FUNCTION: acpi_tb_convert_fadt * * PARAMETERS: None, uses acpi_gbl_FADT * * RETURN: None * * DESCRIPTION: Converts all versions of the FADT to a common internal format. * Expand all 32-bit addresses to 64-bit. * * NOTE: acpi_gbl_FADT must be of size (struct acpi_table_fadt), * and must contain a copy of the actual FADT. * * ACPICA will use the "X" fields of the FADT for all addresses. * * "X" fields are optional extensions to the original V1.0 fields. Even if * they are present in the structure, they can be optionally not used by * setting them to zero. Therefore, we must selectively expand V1.0 fields * if the corresponding X field is zero. * * For ACPI 1.0 FADTs, all address fields are expanded to the corresponding * "X" fields. * * For ACPI 2.0 FADTs, any "X" fields that are NULL are filled in by * expanding the corresponding ACPI 1.0 field. * ******************************************************************************/ static void acpi_tb_convert_fadt(void) { u8 pm1_register_bit_width; u8 pm1_register_byte_width; struct acpi_generic_address *target64; u32 i; /* Update the local FADT table header length */ acpi_gbl_FADT.header.length = sizeof(struct acpi_table_fadt); /* * Expand the 32-bit FACS and DSDT addresses to 64-bit as necessary. * Later code will always use the X 64-bit field. Also, check for an * address mismatch between the 32-bit and 64-bit address fields * (FIRMWARE_CTRL/X_FIRMWARE_CTRL, DSDT/X_DSDT) which would indicate * the presence of two FACS or two DSDT tables. */ if (!acpi_gbl_FADT.Xfacs) { acpi_gbl_FADT.Xfacs = (u64) acpi_gbl_FADT.facs; } else if (acpi_gbl_FADT.facs && (acpi_gbl_FADT.Xfacs != (u64) acpi_gbl_FADT.facs)) { ACPI_WARNING((AE_INFO, "32/64 FACS address mismatch in FADT - two FACS tables!")); } if (!acpi_gbl_FADT.Xdsdt) { acpi_gbl_FADT.Xdsdt = (u64) acpi_gbl_FADT.dsdt; } else if (acpi_gbl_FADT.dsdt && (acpi_gbl_FADT.Xdsdt != (u64) acpi_gbl_FADT.dsdt)) { ACPI_WARNING((AE_INFO, "32/64 DSDT address mismatch in FADT - two DSDT tables!")); } /* * For ACPI 1.0 FADTs (revision 1 or 2), ensure that reserved fields which * should be zero are indeed zero. This will workaround BIOSs that * inadvertently place values in these fields. * * The ACPI 1.0 reserved fields that will be zeroed are the bytes located at * offset 45, 55, 95, and the word located at offset 109, 110. */ if (acpi_gbl_FADT.header.revision < FADT2_REVISION_ID) { acpi_gbl_FADT.preferred_profile = 0; acpi_gbl_FADT.pstate_control = 0; acpi_gbl_FADT.cst_control = 0; acpi_gbl_FADT.boot_flags = 0; } /* * Expand the ACPI 1.0 32-bit addresses to the ACPI 2.0 64-bit "X" * generic address structures as necessary. Later code will always use * the 64-bit address structures. */ for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) { target64 = ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT, fadt_info_table[i].address64); /* Expand only if the 64-bit X target is null */ if (!target64->address) { /* The space_id is always I/O for the 32-bit legacy address fields */ acpi_tb_init_generic_address(target64, ACPI_ADR_SPACE_SYSTEM_IO, *ACPI_ADD_PTR(u8, &acpi_gbl_FADT, fadt_info_table [i].length), (u64) * ACPI_ADD_PTR(u32, &acpi_gbl_FADT, fadt_info_table [i]. address32)); } } /* Validate FADT values now, before we make any changes */ acpi_tb_validate_fadt(); /* * Optionally check all register lengths against the default values and * update them if they are incorrect. */ if (acpi_gbl_use_default_register_widths) { for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) { target64 = ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT, fadt_info_table[i].address64); /* * If a valid register (Address != 0) and the (default_length > 0) * (Not a GPE register), then check the width against the default. */ if ((target64->address) && (fadt_info_table[i].default_length > 0) && (fadt_info_table[i].default_length != target64->bit_width)) { ACPI_WARNING((AE_INFO, "Invalid length for %s: %d, using default %d", fadt_info_table[i].name, target64->bit_width, fadt_info_table[i]. default_length)); /* Incorrect size, set width to the default */ target64->bit_width = fadt_info_table[i].default_length; } } } /* * Get the length of the individual PM1 registers (enable and status). * Each register is defined to be (event block length / 2). */ pm1_register_bit_width = (u8)ACPI_DIV_2(acpi_gbl_FADT.xpm1a_event_block.bit_width); pm1_register_byte_width = (u8)ACPI_DIV_8(pm1_register_bit_width); /* * Adjust the lengths of the PM1 Event Blocks so that they can be used to * access the PM1 status register(s). Use (width / 2) */ acpi_gbl_FADT.xpm1a_event_block.bit_width = pm1_register_bit_width; acpi_gbl_FADT.xpm1b_event_block.bit_width = pm1_register_bit_width; /* * Calculate separate GAS structs for the PM1 Enable registers. * These addresses do not appear (directly) in the FADT, so it is * useful to calculate them once, here. * * The PM event blocks are split into two register blocks, first is the * PM Status Register block, followed immediately by the PM Enable * Register block. Each is of length (xpm1x_event_block.bit_width/2). * * On various systems the v2 fields (and particularly the bit widths) * cannot be relied upon, though. Hence resort to using the v1 length * here (and warn about the inconsistency). */ if (acpi_gbl_FADT.xpm1a_event_block.bit_width != acpi_gbl_FADT.pm1_event_length * 8) printk(KERN_WARNING "FADT: " "X_PM1a_EVT_BLK.bit_width (%u) does not match" " PM1_EVT_LEN (%u)\n", acpi_gbl_FADT.xpm1a_event_block.bit_width, acpi_gbl_FADT.pm1_event_length); /* The PM1A register block is required */ acpi_tb_init_generic_address(&acpi_gbl_xpm1a_enable, acpi_gbl_FADT.xpm1a_event_block.space_id, pm1_register_byte_width, (acpi_gbl_FADT.xpm1a_event_block.address + pm1_register_byte_width)); /* Don't forget to copy space_id of the GAS */ acpi_gbl_xpm1a_enable.space_id = acpi_gbl_FADT.xpm1a_event_block.space_id; /* The PM1B register block is optional, ignore if not present */ if (acpi_gbl_FADT.xpm1b_event_block.address) { if (acpi_gbl_FADT.xpm1b_event_block.bit_width != acpi_gbl_FADT.pm1_event_length * 8) printk(KERN_WARNING "FADT: " "X_PM1b_EVT_BLK.bit_width (%u) does not match" " PM1_EVT_LEN (%u)\n", acpi_gbl_FADT.xpm1b_event_block.bit_width, acpi_gbl_FADT.pm1_event_length); acpi_tb_init_generic_address(&acpi_gbl_xpm1b_enable, acpi_gbl_FADT.xpm1b_event_block.space_id, pm1_register_byte_width, (acpi_gbl_FADT.xpm1b_event_block. address + pm1_register_byte_width)); /* Don't forget to copy space_id of the GAS */ acpi_gbl_xpm1b_enable.space_id = acpi_gbl_FADT.xpm1b_event_block.space_id; } } /****************************************************************************** * * FUNCTION: acpi_tb_validate_fadt * * PARAMETERS: Table - Pointer to the FADT to be validated * * RETURN: None * * DESCRIPTION: Validate various important fields within the FADT. If a problem * is found, issue a message, but no status is returned. * Used by both the table manager and the disassembler. * * Possible additional checks: * (acpi_gbl_FADT.pm1_event_length >= 4) * (acpi_gbl_FADT.pm1_control_length >= 2) * (acpi_gbl_FADT.pm_timer_length >= 4) * Gpe block lengths must be multiple of 2 * ******************************************************************************/ static void acpi_tb_validate_fadt(void) { char *name; u32 *address32; struct acpi_generic_address *address64; u8 length; u32 i; /* * Check for FACS and DSDT address mismatches. An address mismatch between * the 32-bit and 64-bit address fields (FIRMWARE_CTRL/X_FIRMWARE_CTRL and * DSDT/X_DSDT) would indicate the presence of two FACS or two DSDT tables. */ if (acpi_gbl_FADT.facs && (acpi_gbl_FADT.Xfacs != (u64) acpi_gbl_FADT.facs)) { ACPI_WARNING((AE_INFO, "32/64X FACS address mismatch in FADT - " "two FACS tables! %8.8X/%8.8X%8.8X", acpi_gbl_FADT.facs, ACPI_FORMAT_UINT64(acpi_gbl_FADT.Xfacs))); } if (acpi_gbl_FADT.dsdt && (acpi_gbl_FADT.Xdsdt != (u64) acpi_gbl_FADT.dsdt)) { ACPI_WARNING((AE_INFO, "32/64X DSDT address mismatch in FADT - " "two DSDT tables! %8.8X/%8.8X%8.8X", acpi_gbl_FADT.dsdt, ACPI_FORMAT_UINT64(acpi_gbl_FADT.Xdsdt))); } /* Examine all of the 64-bit extended address fields (X fields) */ for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) { /* * Generate pointers to the 32-bit and 64-bit addresses, get the * register length (width), and the register name */ address64 = ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT, fadt_info_table[i].address64); address32 = ACPI_ADD_PTR(u32, &acpi_gbl_FADT, fadt_info_table[i].address32); length = *ACPI_ADD_PTR(u8, &acpi_gbl_FADT, fadt_info_table[i].length); name = fadt_info_table[i].name; /* * For each extended field, check for length mismatch between the * legacy length field and the corresponding 64-bit X length field. */ if (address64 && (address64->bit_width != ACPI_MUL_8(length))) { ACPI_WARNING((AE_INFO, "32/64X length mismatch in %s: %d/%d", name, ACPI_MUL_8(length), address64->bit_width)); } if (fadt_info_table[i].type & ACPI_FADT_REQUIRED) { /* * Field is required (Pm1a_event, Pm1a_control, pm_timer). * Both the address and length must be non-zero. */ if (!address64->address || !length) { ACPI_ERROR((AE_INFO, "Required field %s has zero address and/or length: %8.8X%8.8X/%X", name, ACPI_FORMAT_UINT64(address64-> address), length)); } } else if (fadt_info_table[i].type & ACPI_FADT_SEPARATE_LENGTH) { /* * Field is optional (PM2Control, GPE0, GPE1) AND has its own * length field. If present, both the address and length must be valid. */ if ((address64->address && !length) || (!address64->address && length)) { ACPI_WARNING((AE_INFO, "Optional field %s has zero address or length: %8.8X%8.8X/%X", name, ACPI_FORMAT_UINT64(address64-> address), length)); } } /* If both 32- and 64-bit addresses are valid (non-zero), they must match */ if (address64->address && *address32 && (address64->address != (u64) * address32)) { ACPI_ERROR((AE_INFO, "32/64X address mismatch in %s: %8.8X/%8.8X%8.8X, using 64X", name, *address32, ACPI_FORMAT_UINT64(address64->address))); } } }