| // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 |
| /****************************************************************************** |
| * |
| * Module Name: tbfadt - FADT table utilities |
| * |
| * Copyright (C) 2000 - 2022, 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 Hardware Reduced flag is set, there is no FACS */ |
| |
| if (!acpi_gbl_reduced_hardware) { |
| 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); |
| } |
| } |
| } |