/******************************************************************************
*
* Module Name: tbfadt - FADT table utilities
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2018, 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 "acpi.h"
#include "accommon.h"
#include "actables.h"
#define _COMPONENT ACPI_TABLES
ACPI_MODULE_NAME ("tbfadt")
/* Local prototypes */
static void
AcpiTbInitGenericAddress (
ACPI_GENERIC_ADDRESS *GenericAddress,
UINT8 SpaceId,
UINT8 ByteWidth,
UINT64 Address,
const char *RegisterName,
UINT8 Flags);
static void
AcpiTbConvertFadt (
void);
static void
AcpiTbSetupFadtRegisters (
void);
static UINT64
AcpiTbSelectAddress (
char *RegisterName,
UINT32 Address32,
UINT64 Address64);
/* Table for conversion of FADT to common internal format and FADT validation */
typedef struct acpi_fadt_info
{
const char *Name;
UINT16 Address64;
UINT16 Address32;
UINT16 Length;
UINT8 DefaultLength;
UINT8 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 ACPI_FADT_INFO FadtInfoTable[] =
{
{"Pm1aEventBlock",
ACPI_FADT_OFFSET (XPm1aEventBlock),
ACPI_FADT_OFFSET (Pm1aEventBlock),
ACPI_FADT_OFFSET (Pm1EventLength),
ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */
ACPI_FADT_REQUIRED},
{"Pm1bEventBlock",
ACPI_FADT_OFFSET (XPm1bEventBlock),
ACPI_FADT_OFFSET (Pm1bEventBlock),
ACPI_FADT_OFFSET (Pm1EventLength),
ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */
ACPI_FADT_OPTIONAL},
{"Pm1aControlBlock",
ACPI_FADT_OFFSET (XPm1aControlBlock),
ACPI_FADT_OFFSET (Pm1aControlBlock),
ACPI_FADT_OFFSET (Pm1ControlLength),
ACPI_PM1_REGISTER_WIDTH,
ACPI_FADT_REQUIRED},
{"Pm1bControlBlock",
ACPI_FADT_OFFSET (XPm1bControlBlock),
ACPI_FADT_OFFSET (Pm1bControlBlock),
ACPI_FADT_OFFSET (Pm1ControlLength),
ACPI_PM1_REGISTER_WIDTH,
ACPI_FADT_OPTIONAL},
{"Pm2ControlBlock",
ACPI_FADT_OFFSET (XPm2ControlBlock),
ACPI_FADT_OFFSET (Pm2ControlBlock),
ACPI_FADT_OFFSET (Pm2ControlLength),
ACPI_PM2_REGISTER_WIDTH,
ACPI_FADT_SEPARATE_LENGTH},
{"PmTimerBlock",
ACPI_FADT_OFFSET (XPmTimerBlock),
ACPI_FADT_OFFSET (PmTimerBlock),
ACPI_FADT_OFFSET (PmTimerLength),
ACPI_PM_TIMER_WIDTH,
ACPI_FADT_SEPARATE_LENGTH}, /* ACPI 5.0A: Timer is optional */
{"Gpe0Block",
ACPI_FADT_OFFSET (XGpe0Block),
ACPI_FADT_OFFSET (Gpe0Block),
ACPI_FADT_OFFSET (Gpe0BlockLength),
0,
ACPI_FADT_SEPARATE_LENGTH | ACPI_FADT_GPE_REGISTER},
{"Gpe1Block",
ACPI_FADT_OFFSET (XGpe1Block),
ACPI_FADT_OFFSET (Gpe1Block),
ACPI_FADT_OFFSET (Gpe1BlockLength),
0,
ACPI_FADT_SEPARATE_LENGTH | ACPI_FADT_GPE_REGISTER}
};
#define ACPI_FADT_INFO_ENTRIES \
(sizeof (FadtInfoTable) / sizeof (ACPI_FADT_INFO))
/* Table used to split Event Blocks into separate status/enable registers */
typedef struct acpi_fadt_pm_info
{
ACPI_GENERIC_ADDRESS *Target;
UINT16 Source;
UINT8 RegisterNum;
} ACPI_FADT_PM_INFO;
static ACPI_FADT_PM_INFO FadtPmInfoTable[] =
{
{&AcpiGbl_XPm1aStatus,
ACPI_FADT_OFFSET (XPm1aEventBlock),
0},
{&AcpiGbl_XPm1aEnable,
ACPI_FADT_OFFSET (XPm1aEventBlock),
1},
{&AcpiGbl_XPm1bStatus,
ACPI_FADT_OFFSET (XPm1bEventBlock),
0},
{&AcpiGbl_XPm1bEnable,
ACPI_FADT_OFFSET (XPm1bEventBlock),
1}
};
#define ACPI_FADT_PM_INFO_ENTRIES \
(sizeof (FadtPmInfoTable) / sizeof (ACPI_FADT_PM_INFO))
/*******************************************************************************
*
* FUNCTION: AcpiTbInitGenericAddress
*
* PARAMETERS: GenericAddress - GAS struct to be initialized
* SpaceId - ACPI Space ID for this register
* ByteWidth - Width of this register
* Address - Address of the register
* RegisterName - 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
AcpiTbInitGenericAddress (
ACPI_GENERIC_ADDRESS *GenericAddress,
UINT8 SpaceId,
UINT8 ByteWidth,
UINT64 Address,
const char *RegisterName,
UINT8 Flags)
{
UINT8 BitWidth;
/*
* Bit width field in the GAS is only one byte long, 255 max.
* Check for BitWidth overflow in GAS.
*/
BitWidth = (UINT8) (ByteWidth * 8);
if (ByteWidth > 31) /* (31*8)=248, (32*8)=256 */
{
/*
* No error for GPE blocks, because we do not use the BitWidth
* for GPEs, the legacy length (ByteWidth) 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",
RegisterName, ByteWidth, (ByteWidth * 8)));
}
BitWidth = 255;
}
/*
* The 64-bit Address field is non-aligned in the byte packed
* GAS struct.
*/
ACPI_MOVE_64_TO_64 (&GenericAddress->Address, &Address);
/* All other fields are byte-wide */
GenericAddress->SpaceId = SpaceId;
GenericAddress->BitWidth = BitWidth;
GenericAddress->BitOffset = 0;
GenericAddress->AccessWidth = 0; /* Access width ANY */
}
/*******************************************************************************
*
* FUNCTION: AcpiTbSelectAddress
*
* PARAMETERS: RegisterName - 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 AcpiGbl_Use32BitFadtAddresses flag.
*
******************************************************************************/
static UINT64
AcpiTbSelectAddress (
char *RegisterName,
UINT32 Address32,
UINT64 Address64)
{
if (!Address64)
{
/* 64-bit address is zero, use 32-bit address */
return ((UINT64) Address32);
}
if (Address32 &&
(Address64 != (UINT64) 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",
RegisterName, Address32, ACPI_FORMAT_UINT64 (Address64),
AcpiGbl_Use32BitFadtAddresses ? 32 : 64));
/* 32-bit address override */
if (AcpiGbl_Use32BitFadtAddresses)
{
return ((UINT64) Address32);
}
}
/* Default is to use the 64-bit address */
return (Address64);
}
/*******************************************************************************
*
* FUNCTION: AcpiTbParseFadt
*
* PARAMETERS: None
*
* RETURN: None
*
* DESCRIPTION: Initialize the FADT, DSDT and FACS tables
* (FADT contains the addresses of the DSDT and FACS)
*
******************************************************************************/
void
AcpiTbParseFadt (
void)
{
UINT32 Length;
ACPI_TABLE_HEADER *Table;
ACPI_TABLE_DESC *FadtDesc;
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.
*/
FadtDesc = &AcpiGbl_RootTableList.Tables[AcpiGbl_FadtIndex];
Status = AcpiTbGetTable (FadtDesc, &Table);
if (ACPI_FAILURE (Status))
{
return;
}
Length = FadtDesc->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) AcpiTbVerifyChecksum (Table, Length);
/* Create a local copy of the FADT in common ACPI 2.0+ format */
AcpiTbCreateLocalFadt (Table, Length);
/* All done with the real FADT, unmap it */
AcpiTbPutTable (FadtDesc);
/* Obtain the DSDT and FACS tables via their addresses within the FADT */
AcpiTbInstallStandardTable (
(ACPI_PHYSICAL_ADDRESS) AcpiGbl_FADT.XDsdt,
ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL, FALSE, TRUE,
&AcpiGbl_DsdtIndex);
/* If Hardware Reduced flag is set, there is no FACS */
if (!AcpiGbl_ReducedHardware)
{
if (AcpiGbl_FADT.Facs)
{
AcpiTbInstallStandardTable (
(ACPI_PHYSICAL_ADDRESS) AcpiGbl_FADT.Facs,
ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL, FALSE, TRUE,
&AcpiGbl_FacsIndex);
}
if (AcpiGbl_FADT.XFacs)
{
AcpiTbInstallStandardTable (
(ACPI_PHYSICAL_ADDRESS) AcpiGbl_FADT.XFacs,
ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL, FALSE, TRUE,
&AcpiGbl_XFacsIndex);
}
}
}
/*******************************************************************************
*
* FUNCTION: AcpiTbCreateLocalFadt
*
* 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
AcpiTbCreateLocalFadt (
ACPI_TABLE_HEADER *Table,
UINT32 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 (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,
(UINT32) sizeof (ACPI_TABLE_FADT)));
}
/* Clear the entire local FADT */
memset (&AcpiGbl_FADT, 0, sizeof (ACPI_TABLE_FADT));
/* Copy the original FADT, up to sizeof (ACPI_TABLE_FADT) */
memcpy (&AcpiGbl_FADT, Table,
ACPI_MIN (Length, sizeof (ACPI_TABLE_FADT)));
/* Take a copy of the Hardware Reduced flag */
AcpiGbl_ReducedHardware = FALSE;
if (AcpiGbl_FADT.Flags & ACPI_FADT_HW_REDUCED)
{
AcpiGbl_ReducedHardware = TRUE;
}
/* Convert the local copy of the FADT to the common internal format */
AcpiTbConvertFadt ();
/* Initialize the global ACPI register structures */
AcpiTbSetupFadtRegisters ();
}
/*******************************************************************************
*
* FUNCTION: AcpiTbConvertFadt
*
* PARAMETERS: None - AcpiGbl_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: AcpiGbl_FADT must be of size (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:
* (AcpiGbl_FADT.Pm1EventLength >= 4)
* (AcpiGbl_FADT.Pm1ControlLength >= 2)
* (AcpiGbl_FADT.PmTimerLength >= 4)
* Gpe block lengths must be multiple of 2
*
******************************************************************************/
static void
AcpiTbConvertFadt (
void)
{
const char *Name;
ACPI_GENERIC_ADDRESS *Address64;
UINT32 Address32;
UINT8 Length;
UINT8 Flags;
UINT32 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 (AcpiGbl_FADT.Header.Length <= ACPI_FADT_V2_SIZE)
{
AcpiGbl_FADT.PreferredProfile = 0;
AcpiGbl_FADT.PstateControl = 0;
AcpiGbl_FADT.CstControl = 0;
AcpiGbl_FADT.BootFlags = 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.
*/
AcpiGbl_FADT.Header.Length = sizeof (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.
*/
AcpiGbl_FADT.XDsdt = AcpiTbSelectAddress ("DSDT",
AcpiGbl_FADT.Dsdt, AcpiGbl_FADT.XDsdt);
/* If Hardware Reduced flag is set, we are all done */
if (AcpiGbl_ReducedHardware)
{
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 (UINT32,
&AcpiGbl_FADT, FadtInfoTable[i].Address32);
Address64 = ACPI_ADD_PTR (ACPI_GENERIC_ADDRESS,
&AcpiGbl_FADT, FadtInfoTable[i].Address64);
Length = *ACPI_ADD_PTR (UINT8,
&AcpiGbl_FADT, FadtInfoTable[i].Length);
Name = FadtInfoTable[i].Name;
Flags = FadtInfoTable[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 AcpiGbl_Use32BitFadtAddresses flag.
*
* During 64-bit address construction and verification,
* these cases are handled:
*
* Address32 zero, Address64 [don't care] - Use Address64
*
* No override: if AcpiGbl_Use32BitFadtAddresses 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 AcpiGbl_Use32BitFadtAddresses 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: SpaceId is always I/O for 32-bit legacy address fields
*/
if (Address32)
{
if (Address64->Address)
{
if (Address64->Address != (UINT64) 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),
AcpiGbl_Use32BitFadtAddresses ? 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 accomodate, 0xFF bits).
*/
if ((ACPI_MUL_8 (Length) <= ACPI_UINT8_MAX) &&
(Address64->BitWidth != ACPI_MUL_8 (Length)))
{
ACPI_BIOS_WARNING ((AE_INFO,
"32/64X length mismatch in FADT/%s: %u/%u",
Name, ACPI_MUL_8 (Length), Address64->BitWidth));
}
}
/*
* 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
* AccessSize/BitWidth/BitOffset 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 || AcpiGbl_Use32BitFadtAddresses)
{
AcpiTbInitGenericAddress (Address64,
ACPI_ADR_SPACE_SYSTEM_IO, Length,
(UINT64) Address32, Name, Flags);
}
}
if (FadtInfoTable[i].Flags & ACPI_FADT_REQUIRED)
{
/*
* Field is required (PM1aEvent, PM1aControl).
* 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 (FadtInfoTable[i].Flags & 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_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: AcpiTbSetupFadtRegisters
*
* PARAMETERS: None, uses AcpiGbl_FADT.
*
* RETURN: None
*
* DESCRIPTION: Initialize global ACPI PM1 register definitions. Optionally,
* force FADT register definitions to their default lengths.
*
******************************************************************************/
static void
AcpiTbSetupFadtRegisters (
void)
{
ACPI_GENERIC_ADDRESS *Target64;
ACPI_GENERIC_ADDRESS *Source64;
UINT8 Pm1RegisterByteWidth;
UINT32 i;
/*
* Optionally check all register lengths against the default values and
* update them if they are incorrect.
*/
if (AcpiGbl_UseDefaultRegisterWidths)
{
for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++)
{
Target64 = ACPI_ADD_PTR (ACPI_GENERIC_ADDRESS, &AcpiGbl_FADT,
FadtInfoTable[i].Address64);
/*
* If a valid register (Address != 0) and the (DefaultLength > 0)
* (Not a GPE register), then check the width against the default.
*/
if ((Target64->Address) &&
(FadtInfoTable[i].DefaultLength > 0) &&
(FadtInfoTable[i].DefaultLength != Target64->BitWidth))
{
ACPI_BIOS_WARNING ((AE_INFO,
"Invalid length for FADT/%s: %u, using default %u",
FadtInfoTable[i].Name, Target64->BitWidth,
FadtInfoTable[i].DefaultLength));
/* Incorrect size, set width to the default */
Target64->BitWidth = FadtInfoTable[i].DefaultLength;
}
}
}
/*
* 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.
*/
Pm1RegisterByteWidth = (UINT8)
ACPI_DIV_16 (AcpiGbl_FADT.XPm1aEventBlock.BitWidth);
/*
* 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 (Pm1EventLength/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 (ACPI_GENERIC_ADDRESS, &AcpiGbl_FADT,
FadtPmInfoTable[i].Source);
if (Source64->Address)
{
AcpiTbInitGenericAddress (FadtPmInfoTable[i].Target,
Source64->SpaceId, Pm1RegisterByteWidth,
Source64->Address +
(FadtPmInfoTable[i].RegisterNum * Pm1RegisterByteWidth),
"PmRegisters", 0);
}
}
}