/****************************************************************************** * * 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 #define _COMPONENT ACPI_TABLES ACPI_MODULE_NAME("tbfadt") /* Local prototypes */ static void inline acpi_tb_init_generic_address(struct acpi_generic_address *generic_address, 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 target; u8 source; u8 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_FADT_REQUIRED}, {"Pm1bEventBlock", ACPI_FADT_OFFSET(xpm1b_event_block), ACPI_FADT_OFFSET(pm1b_event_block), ACPI_FADT_OFFSET(pm1_event_length), 0}, {"Pm1aControlBlock", ACPI_FADT_OFFSET(xpm1a_control_block), ACPI_FADT_OFFSET(pm1a_control_block), ACPI_FADT_OFFSET(pm1_control_length), ACPI_FADT_REQUIRED}, {"Pm1bControlBlock", ACPI_FADT_OFFSET(xpm1b_control_block), ACPI_FADT_OFFSET(pm1b_control_block), ACPI_FADT_OFFSET(pm1_control_length), 0}, {"Pm2ControlBlock", ACPI_FADT_OFFSET(xpm2_control_block), ACPI_FADT_OFFSET(pm2_control_block), ACPI_FADT_OFFSET(pm2_control_length), ACPI_FADT_SEPARATE_LENGTH}, {"PmTimerBlock", ACPI_FADT_OFFSET(xpm_timer_block), ACPI_FADT_OFFSET(pm_timer_block), ACPI_FADT_OFFSET(pm_timer_length), ACPI_FADT_REQUIRED}, {"Gpe0Block", ACPI_FADT_OFFSET(xgpe0_block), ACPI_FADT_OFFSET(gpe0_block), ACPI_FADT_OFFSET(gpe0_block_length), ACPI_FADT_SEPARATE_LENGTH}, {"Gpe1Block", ACPI_FADT_OFFSET(xgpe1_block), ACPI_FADT_OFFSET(gpe1_block), ACPI_FADT_OFFSET(gpe1_block_length), 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 void inline acpi_tb_init_generic_address(struct acpi_generic_address *generic_address, 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 = ACPI_ADR_SPACE_SYSTEM_IO; generic_address->bit_width = byte_width << 3; generic_address->bit_offset = 0; generic_address->access_width = 0; } /******************************************************************************* * * 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(); acpi_tb_validate_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_length; struct acpi_generic_address *target; 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 */ if (!acpi_gbl_FADT.Xfacs) { acpi_gbl_FADT.Xfacs = (u64) acpi_gbl_FADT.facs; } if (!acpi_gbl_FADT.Xdsdt) { acpi_gbl_FADT.Xdsdt = (u64) acpi_gbl_FADT.dsdt; } /* * 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 < 3) { 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 V1.0 addresses to the ACPI 2.0 64-bit "X" * generic address structures as necessary. */ for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) { target = ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT, fadt_info_table[i].target); /* Expand only if the X target is null */ if (!target->address) { acpi_tb_init_generic_address(target, *ACPI_ADD_PTR(u8, &acpi_gbl_FADT, fadt_info_table [i].length), (u64) * ACPI_ADD_PTR(u32, &acpi_gbl_FADT, fadt_info_table [i]. source)); } } /* * 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); pm1_register_length = (u8) ACPI_DIV_2(acpi_gbl_FADT.pm1_event_length); /* The PM1A register block is required */ acpi_tb_init_generic_address(&acpi_gbl_xpm1a_enable, pm1_register_length, (acpi_gbl_FADT.xpm1a_event_block.address + pm1_register_length)); /* 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, pm1_register_length, (acpi_gbl_FADT.xpm1b_event_block. address + pm1_register_length)); /* 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) { u32 *address32; struct acpi_generic_address *address64; u8 length; u32 i; /* 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 and get the length */ address64 = ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT, fadt_info_table[i].target); address32 = ACPI_ADD_PTR(u32, &acpi_gbl_FADT, fadt_info_table[i].source); length = *ACPI_ADD_PTR(u8, &acpi_gbl_FADT, fadt_info_table[i].length); 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", fadt_info_table[i].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", fadt_info_table[i].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", fadt_info_table[i].name, *address32, ACPI_FORMAT_UINT64(address64->address))); } } }