// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
*
* Module Name: tbfadt - FADT table utilities
*
* Copyright (C) 2000 - 2023, 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);
}
}
}
Codebase Browser
linux