// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 /****************************************************************************** * * Module Name: tbfadt - FADT table utilities * * Copyright (C) 2000 - 2025, Intel Corp. * *****************************************************************************/ #include <acpi/acpi.h> #include "accommon.h" #include "actables.h" #define _COMPONENT ACPI_TABLES ACPI_MODULE_NAME("tbfadt") /* Local prototypes */ static void acpi_tb_init_generic_address(struct acpi_generic_address *generic_address, u8 space_id, u8 byte_width, u64 address, const char *register_name, u8 flags); static void acpi_tb_convert_fadt(void); static void acpi_tb_setup_fadt_registers(void); static u64 acpi_tb_select_address(char *register_name, u32 address32, u64 address64); /* Table for conversion of FADT to common internal format and FADT validation */ typedef struct acpi_fadt_info { const char *name; u16 address64; u16 address32; u16 length; u8 default_length; u8 flags; } acpi_fadt_info; #define ACPI_FADT_OPTIONAL 0 #define ACPI_FADT_REQUIRED 1 #define ACPI_FADT_SEPARATE_LENGTH 2 #define ACPI_FADT_GPE_REGISTER 4 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 */ ACPI_FADT_OPTIONAL}, {"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, ACPI_FADT_OPTIONAL}, {"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_SEPARATE_LENGTH}, /* ACPI 5.0A: Timer is optional */ {"Gpe0Block", ACPI_FADT_OFFSET(xgpe0_block), ACPI_FADT_OFFSET(gpe0_block), ACPI_FADT_OFFSET(gpe0_block_length), 0, ACPI_FADT_SEPARATE_LENGTH | ACPI_FADT_GPE_REGISTER}, {"Gpe1Block", ACPI_FADT_OFFSET(xgpe1_block), ACPI_FADT_OFFSET(gpe1_block), ACPI_FADT_OFFSET(gpe1_block_length), 0, ACPI_FADT_SEPARATE_LENGTH | ACPI_FADT_GPE_REGISTER} }; #define ACPI_FADT_INFO_ENTRIES \ (sizeof (fadt_info_table) / sizeof (struct acpi_fadt_info)) /* Table used to split Event Blocks into separate status/enable registers */ typedef struct acpi_fadt_pm_info { struct acpi_generic_address *target; u16 source; u8 register_num; } acpi_fadt_pm_info; static struct acpi_fadt_pm_info fadt_pm_info_table[] = { {&acpi_gbl_xpm1a_status, ACPI_FADT_OFFSET(xpm1a_event_block), 0}, {&acpi_gbl_xpm1a_enable, ACPI_FADT_OFFSET(xpm1a_event_block), 1}, {&acpi_gbl_xpm1b_status, ACPI_FADT_OFFSET(xpm1b_event_block), 0}, {&acpi_gbl_xpm1b_enable, ACPI_FADT_OFFSET(xpm1b_event_block), 1} }; #define ACPI_FADT_PM_INFO_ENTRIES \ (sizeof (fadt_pm_info_table) / sizeof (struct acpi_fadt_pm_info)) /******************************************************************************* * * FUNCTION: acpi_tb_init_generic_address * * PARAMETERS: generic_address - GAS struct to be initialized * space_id - ACPI Space ID for this register * byte_width - Width of this register * address - Address of the register * register_name - ASCII name of the ACPI 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 acpi_tb_init_generic_address(struct acpi_generic_address *generic_address, u8 space_id, u8 byte_width, u64 address, const char *register_name, u8 flags) { u8 bit_width; /* * Bit width field in the GAS is only one byte long, 255 max. * Check for bit_width overflow in GAS. */ bit_width = (u8)(byte_width * 8); if (byte_width > 31) { /* (31*8)=248, (32*8)=256 */ /* * No error for GPE blocks, because we do not use the bit_width * for GPEs, the legacy length (byte_width) is used instead to * allow for a large number of GPEs. */ if (!(flags & ACPI_FADT_GPE_REGISTER)) { ACPI_ERROR((AE_INFO, "%s - 32-bit FADT register is too long (%u bytes, %u bits) " "to convert to GAS struct - 255 bits max, truncating", register_name, byte_width, (byte_width * 8))); } bit_width = 255; } /* * 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 = bit_width; generic_address->bit_offset = 0; generic_address->access_width = 0; /* Access width ANY */ } /******************************************************************************* * * FUNCTION: acpi_tb_select_address * * PARAMETERS: register_name - ASCII name of the ACPI register * address32 - 32-bit address of the register * address64 - 64-bit address of the register * * RETURN: The resolved 64-bit address * * DESCRIPTION: Select between 32-bit and 64-bit versions of addresses within * the FADT. Used for the FACS and DSDT addresses. * * NOTES: * * 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) could be a corrupted address field or it might indicate * the presence of two FACS or two DSDT tables. * * November 2013: * By default, as per the ACPICA specification, a valid 64-bit address is * used regardless of the value of the 32-bit address. However, this * behavior can be overridden via the acpi_gbl_use32_bit_fadt_addresses flag. * ******************************************************************************/ static u64 acpi_tb_select_address(char *register_name, u32 address32, u64 address64) { if (!address64) { /* 64-bit address is zero, use 32-bit address */ return ((u64)address32); } if (address32 && (address64 != (u64)address32)) { /* Address mismatch between 32-bit and 64-bit versions */ ACPI_BIOS_WARNING((AE_INFO, "32/64X %s address mismatch in FADT: " "0x%8.8X/0x%8.8X%8.8X, using %u-bit address", register_name, address32, ACPI_FORMAT_UINT64(address64), acpi_gbl_use32_bit_fadt_addresses ? 32 : 64)); /* 32-bit address override */ if (acpi_gbl_use32_bit_fadt_addresses) { return ((u64)address32); } } /* Default is to use the 64-bit address */ return (address64); } /******************************************************************************* * * FUNCTION: acpi_tb_parse_fadt * * PARAMETERS: None * * RETURN: None * * DESCRIPTION: Initialize the FADT, DSDT and FACS tables * (FADT contains the addresses of the DSDT and FACS) * ******************************************************************************/ void acpi_tb_parse_fadt(void) { u32 length; struct acpi_table_header *table; struct acpi_table_desc *fadt_desc; acpi_status status; /* * 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. */ fadt_desc = &acpi_gbl_root_table_list.tables[acpi_gbl_fadt_index]; status = acpi_tb_get_table(fadt_desc, &table); if (ACPI_FAILURE(status)) { return; } length = fadt_desc->length; /* * 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_ut_verify_checksum(table, length); /* Create 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_tb_put_table(fadt_desc); /* Obtain the DSDT and FACS tables via their addresses within the FADT */ acpi_tb_install_standard_table((acpi_physical_address)acpi_gbl_FADT. Xdsdt, ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL, NULL, FALSE, TRUE, &acpi_gbl_dsdt_index); if (acpi_gbl_FADT.facs) { acpi_tb_install_standard_table((acpi_physical_address) acpi_gbl_FADT.facs, ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL, NULL, FALSE, TRUE, &acpi_gbl_facs_index); } if (acpi_gbl_FADT.Xfacs) { acpi_tb_install_standard_table((acpi_physical_address) acpi_gbl_FADT.Xfacs, ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL, NULL, FALSE, TRUE, &acpi_gbl_xfacs_index); } } /******************************************************************************* * * 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 * (typically the current ACPI specification version). If so, truncate * the table, and issue a warning. */ if (length > sizeof(struct acpi_table_fadt)) { ACPI_BIOS_WARNING((AE_INFO, "FADT (revision %u) is longer than %s length, " "truncating length %u to %u", table->revision, ACPI_FADT_CONFORMANCE, length, (u32)sizeof(struct acpi_table_fadt))); } /* Clear the entire local FADT */ memset(&acpi_gbl_FADT, 0, sizeof(struct acpi_table_fadt)); /* Copy the original FADT, up to sizeof (struct acpi_table_fadt) */ memcpy(&acpi_gbl_FADT, table, ACPI_MIN(length, sizeof(struct acpi_table_fadt))); /* Take a copy of the Hardware Reduced flag */ acpi_gbl_reduced_hardware = FALSE; if (acpi_gbl_FADT.flags & ACPI_FADT_HW_REDUCED) { acpi_gbl_reduced_hardware = TRUE; } /* Convert the local copy of the FADT to the common internal format */ acpi_tb_convert_fadt(); /* Initialize the global ACPI register structures */ acpi_tb_setup_fadt_registers(); } /******************************************************************************* * * FUNCTION: acpi_tb_convert_fadt * * PARAMETERS: none - acpi_gbl_FADT is used. * * RETURN: None * * DESCRIPTION: Converts all versions of the FADT to a common internal format. * Expand 32-bit addresses to 64-bit as necessary. Also validate * important fields within the FADT. * * NOTE: acpi_gbl_FADT must be of size (struct acpi_table_fadt), and must * contain a copy of the actual BIOS-provided FADT. * * Notes on 64-bit register addresses: * * After this FADT conversion, later ACPICA code will only use the 64-bit "X" * fields of the FADT for all ACPI register addresses. * * The 64-bit X fields are optional extensions to the original 32-bit FADT * V1.0 fields. Even if they are present in the FADT, they are optional and * are unused if the BIOS sets them to zero. Therefore, we must copy/expand * 32-bit V1.0 fields to the 64-bit X fields if the 64-bit X field is originally * zero. * * For ACPI 1.0 FADTs (that contain no 64-bit addresses), all 32-bit address * fields are expanded to the corresponding 64-bit X fields in the internal * common FADT. * * For ACPI 2.0+ FADTs, all valid (non-zero) 32-bit address fields are expanded * to the corresponding 64-bit X fields, if the 64-bit field is originally * zero. Adhering to the ACPI specification, we completely ignore the 32-bit * field if the 64-bit field is valid, regardless of whether the host OS is * 32-bit or 64-bit. * * 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_convert_fadt(void) { const char *name; struct acpi_generic_address *address64; u32 address32; u8 length; u8 flags; u32 i; /* * 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. * * Note: The FADT revision value is unreliable. Only the length can be * trusted. */ if (acpi_gbl_FADT.header.length <= ACPI_FADT_V2_SIZE) { acpi_gbl_FADT.preferred_profile = 0; acpi_gbl_FADT.pstate_control = 0; acpi_gbl_FADT.cst_control = 0; acpi_gbl_FADT.boot_flags = 0; } /* * Now we can update the local FADT length to the length of the * current FADT version as defined by the ACPI specification. * Thus, we will have a common FADT internally. */ acpi_gbl_FADT.header.length = sizeof(struct acpi_table_fadt); /* * Expand the 32-bit DSDT addresses to 64-bit as necessary. * Later ACPICA code will always use the X 64-bit field. */ acpi_gbl_FADT.Xdsdt = acpi_tb_select_address("DSDT", acpi_gbl_FADT.dsdt, acpi_gbl_FADT.Xdsdt); /* If Hardware Reduced flag is set, we are all done */ if (acpi_gbl_reduced_hardware) { return; } /* Examine all of the 64-bit extended address fields (X fields) */ for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) { /* * Get the 32-bit and 64-bit addresses, as well as the register * length and register name. */ address32 = *ACPI_ADD_PTR(u32, &acpi_gbl_FADT, fadt_info_table[i].address32); address64 = ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT, fadt_info_table[i].address64); length = *ACPI_ADD_PTR(u8, &acpi_gbl_FADT, fadt_info_table[i].length); name = fadt_info_table[i].name; flags = fadt_info_table[i].flags; /* * 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. * * November 2013: * Now always use the 64-bit address if it is valid (non-zero), in * accordance with the ACPI specification which states that a 64-bit * address supersedes the 32-bit version. This behavior can be * overridden by the acpi_gbl_use32_bit_fadt_addresses flag. * * During 64-bit address construction and verification, * these cases are handled: * * Address32 zero, Address64 [don't care] - Use Address64 * * No override: if acpi_gbl_use32_bit_fadt_addresses is FALSE, and: * Address32 non-zero, Address64 zero - Copy/use Address32 * Address32 non-zero == Address64 non-zero - Use Address64 * Address32 non-zero != Address64 non-zero - Warning, use Address64 * * Override: if acpi_gbl_use32_bit_fadt_addresses is TRUE, and: * Address32 non-zero, Address64 zero - Copy/use Address32 * Address32 non-zero == Address64 non-zero - Copy/use Address32 * Address32 non-zero != Address64 non-zero - Warning, copy/use Address32 * * Note: space_id is always I/O for 32-bit legacy address fields */ if (address32) { if (address64->address) { if (address64->address != (u64)address32) { /* Address mismatch */ ACPI_BIOS_WARNING((AE_INFO, "32/64X address mismatch in FADT/%s: " "0x%8.8X/0x%8.8X%8.8X, using %u-bit address", name, address32, ACPI_FORMAT_UINT64 (address64->address), acpi_gbl_use32_bit_fadt_addresses ? 32 : 64)); } /* * For each extended field, check for length mismatch * between the legacy length field and the corresponding * 64-bit X length field. * Note: If the legacy length field is > 0xFF bits, ignore * this check. (GPE registers can be larger than the * 64-bit GAS structure can accommodate, 0xFF bits). */ if ((ACPI_MUL_8(length) <= ACPI_UINT8_MAX) && (address64->bit_width != ACPI_MUL_8(length))) { ACPI_BIOS_WARNING((AE_INFO, "32/64X length mismatch in FADT/%s: %u/%u", name, ACPI_MUL_8(length), address64-> bit_width)); } } /* * Hardware register access code always uses the 64-bit fields. * So if the 64-bit field is zero or is to be overridden, * initialize it with the 32-bit fields. * Note that when the 32-bit address favor is specified, the * 64-bit fields are always re-initialized so that * access_size/bit_width/bit_offset fields can be correctly * configured to the values to trigger a 32-bit compatible * access mode in the hardware register access code. */ if (!address64->address || acpi_gbl_use32_bit_fadt_addresses) { acpi_tb_init_generic_address(address64, ACPI_ADR_SPACE_SYSTEM_IO, length, (u64)address32, name, flags); } } if (fadt_info_table[i].flags & ACPI_FADT_REQUIRED) { /* * Field is required (Pm1a_event, Pm1a_control). * Both the address and length must be non-zero. */ if (!address64->address || !length) { ACPI_BIOS_ERROR((AE_INFO, "Required FADT field %s has zero address and/or length: " "0x%8.8X%8.8X/0x%X", name, ACPI_FORMAT_UINT64(address64-> address), length)); } } else if (fadt_info_table[i].flags & ACPI_FADT_SEPARATE_LENGTH) { /* * Field is optional (Pm2_control, 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_BIOS_WARNING((AE_INFO, "Optional FADT field %s has valid %s but zero %s: " "0x%8.8X%8.8X/0x%X", name, (length ? "Length" : "Address"), (length ? "Address" : "Length"), ACPI_FORMAT_UINT64 (address64->address), length)); } } } } /******************************************************************************* * * FUNCTION: acpi_tb_setup_fadt_registers * * PARAMETERS: None, uses acpi_gbl_FADT. * * RETURN: None * * DESCRIPTION: Initialize global ACPI PM1 register definitions. Optionally, * force FADT register definitions to their default lengths. * ******************************************************************************/ static void acpi_tb_setup_fadt_registers(void) { struct acpi_generic_address *target64; struct acpi_generic_address *source64; u8 pm1_register_byte_width; u32 i; /* * 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_BIOS_WARNING((AE_INFO, "Invalid length for FADT/%s: %u, using default %u", 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). Extra divide * by 8 converts bits to bytes. */ pm1_register_byte_width = (u8) ACPI_DIV_16(acpi_gbl_FADT.xpm1a_event_block.bit_width); /* * Calculate separate GAS structs for the PM1x (A/B) Status and Enable * registers. These addresses do not appear (directly) in the FADT, so it * is useful to pre-calculate them from the PM1 Event Block definitions. * * 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 (pm1_event_length/2) * * Note: The PM1A event block is required by the ACPI specification. * However, the PM1B event block is optional and is rarely, if ever, * used. */ for (i = 0; i < ACPI_FADT_PM_INFO_ENTRIES; i++) { source64 = ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT, fadt_pm_info_table[i].source); if (source64->address) { acpi_tb_init_generic_address(fadt_pm_info_table[i]. target, source64->space_id, pm1_register_byte_width, source64->address + (fadt_pm_info_table[i]. register_num * pm1_register_byte_width), "PmRegisters", 0); } } }
