exfldio.c File Reference

#include "acpi.h"
#include "accommon.h"
#include "acinterp.h"
#include "amlcode.h"
#include "acevents.h"
#include "acdispat.h"

Include dependency graph for exfldio.c:

Go to the source code of this file.

Macros
#define	_COMPONENT   ACPI_EXECUTER

Functions
static ACPI_STATUS	AcpiExFieldDatumIo (ACPI_OPERAND_OBJECT *ObjDesc, UINT32 FieldDatumByteOffset, UINT64 *Value, UINT32 ReadWrite)
static BOOLEAN	AcpiExRegisterOverflow (ACPI_OPERAND_OBJECT *ObjDesc, UINT64 Value)
static ACPI_STATUS	AcpiExSetupRegion (ACPI_OPERAND_OBJECT *ObjDesc, UINT32 FieldDatumByteOffset)
ACPI_STATUS	AcpiExAccessRegion (ACPI_OPERAND_OBJECT *ObjDesc, UINT32 FieldDatumByteOffset, UINT64 *Value, UINT32 Function)
ACPI_STATUS	AcpiExWriteWithUpdateRule (ACPI_OPERAND_OBJECT *ObjDesc, UINT64 Mask, UINT64 FieldValue, UINT32 FieldDatumByteOffset)
ACPI_STATUS	AcpiExExtractFromField (ACPI_OPERAND_OBJECT *ObjDesc, void *Buffer, UINT32 BufferLength)
ACPI_STATUS	AcpiExInsertIntoField (ACPI_OPERAND_OBJECT *ObjDesc, void *Buffer, UINT32 BufferLength)

Macro Definition Documentation

_COMPONENT

#define _COMPONENT   ACPI_EXECUTER

Definition at line 52 of file exfldio.c.

Function Documentation

AcpiExAccessRegion()

ACPI_STATUS AcpiExAccessRegion	(	ACPI_OPERAND_OBJECT *	ObjDesc,
		UINT32	FieldDatumByteOffset,
		UINT64 *	Value,
		UINT32	Function
	)

Definition at line 249 of file exfldio.c.

{
    ACPI_STATUS             Status;
    ACPI_OPERAND_OBJECT     *RgnDesc;
    UINT32                  RegionOffset;
 
 
    ACPI_FUNCTION_TRACE (ExAccessRegion);
 
 
    /*
     * Ensure that the region operands are fully evaluated and verify
     * the validity of the request
     */
    Status = AcpiExSetupRegion (ObjDesc, FieldDatumByteOffset);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }
 
    /*
     * The physical address of this field datum is:
     *
     * 1) The base of the region, plus
     * 2) The base offset of the field, plus
     * 3) The current offset into the field
     */
    RgnDesc = ObjDesc->CommonField.RegionObj;
    RegionOffset =
        ObjDesc->CommonField.BaseByteOffset +
        FieldDatumByteOffset;
 
    if ((Function & ACPI_IO_MASK) == ACPI_READ)
    {
        ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "[READ]"));
    }
    else
    {
        ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "[WRITE]"));
    }
 
    ACPI_DEBUG_PRINT_RAW ((ACPI_DB_BFIELD,
        " Region [%s:%X], Width %X, ByteBase %X, Offset %X at %8.8X%8.8X\n",
        AcpiUtGetRegionName (RgnDesc->Region.SpaceId),
        RgnDesc->Region.SpaceId,
        ObjDesc->CommonField.AccessByteWidth,
        ObjDesc->CommonField.BaseByteOffset,
        FieldDatumByteOffset,
        ACPI_FORMAT_UINT64 (RgnDesc->Region.Address + RegionOffset)));
 
    /* Invoke the appropriate AddressSpace/OpRegion handler */
 
    Status = AcpiEvAddressSpaceDispatch (RgnDesc, ObjDesc,
        Function, RegionOffset,
        ACPI_MUL_8 (ObjDesc->CommonField.AccessByteWidth), Value);
 
    if (ACPI_FAILURE (Status))
    {
        if (Status == AE_NOT_IMPLEMENTED)
        {
            ACPI_ERROR ((AE_INFO,
                "Region %s (ID=%u) not implemented",
                AcpiUtGetRegionName (RgnDesc->Region.SpaceId),
                RgnDesc->Region.SpaceId));
        }
        else if (Status == AE_NOT_EXIST)
        {
            ACPI_ERROR ((AE_INFO,
                "Region %s (ID=%u) has no handler",
                AcpiUtGetRegionName (RgnDesc->Region.SpaceId),
                RgnDesc->Region.SpaceId));
        }
    }
 
    return_ACPI_STATUS (Status);
}

Referenced by AcpiExFieldDatumIo(), AcpiExReadGpio(), AcpiExReadSerialBus(), AcpiExWriteDataToField(), AcpiExWriteGpio(), and AcpiExWriteSerialBus().

AcpiExExtractFromField()

ACPI_STATUS AcpiExExtractFromField	(	ACPI_OPERAND_OBJECT *	ObjDesc,
		void *	Buffer,
		UINT32	BufferLength
	)

Definition at line 723 of file exfldio.c.

{
    ACPI_STATUS             Status;
    UINT64                  RawDatum;
    UINT64                  MergedDatum;
    UINT32                  FieldOffset = 0;
    UINT32                  BufferOffset = 0;
    UINT32                  BufferTailBits;
    UINT32                  DatumCount;
    UINT32                  FieldDatumCount;
    UINT32                  AccessBitWidth;
    UINT32                  i;
 
 
    ACPI_FUNCTION_TRACE (ExExtractFromField);
 
 
    /* Validate target buffer and clear it */
 
    if (BufferLength <
        ACPI_ROUND_BITS_UP_TO_BYTES (ObjDesc->CommonField.BitLength))
    {
        ACPI_ERROR ((AE_INFO,
            "Field size %u (bits) is too large for buffer (%u)",
            ObjDesc->CommonField.BitLength, BufferLength));
 
        return_ACPI_STATUS (AE_BUFFER_OVERFLOW);
    }
 
    memset (Buffer, 0, BufferLength);
    AccessBitWidth = ACPI_MUL_8 (ObjDesc->CommonField.AccessByteWidth);
 
    /* Handle the simple case here */
 
    if ((ObjDesc->CommonField.StartFieldBitOffset == 0) &&
        (ObjDesc->CommonField.BitLength == AccessBitWidth))
    {
        if (BufferLength >= sizeof (UINT64))
        {
            Status = AcpiExFieldDatumIo (ObjDesc, 0, Buffer, ACPI_READ);
        }
        else
        {
            /* Use RawDatum (UINT64) to handle buffers < 64 bits */
 
            Status = AcpiExFieldDatumIo (ObjDesc, 0, &RawDatum, ACPI_READ);
            memcpy (Buffer, &RawDatum, BufferLength);
        }
 
        return_ACPI_STATUS (Status);
    }
 
/* TBD: Move to common setup code */
 
    /* Field algorithm is limited to sizeof(UINT64), truncate if needed */
 
    if (ObjDesc->CommonField.AccessByteWidth > sizeof (UINT64))
    {
        ObjDesc->CommonField.AccessByteWidth = sizeof (UINT64);
        AccessBitWidth = sizeof (UINT64) * 8;
    }
 
    /* Compute the number of datums (access width data items) */
 
    DatumCount = ACPI_ROUND_UP_TO (
        ObjDesc->CommonField.BitLength, AccessBitWidth);
 
    FieldDatumCount = ACPI_ROUND_UP_TO (
        ObjDesc->CommonField.BitLength +
        ObjDesc->CommonField.StartFieldBitOffset, AccessBitWidth);
 
    /* Priming read from the field */
 
    Status = AcpiExFieldDatumIo (ObjDesc, FieldOffset, &RawDatum, ACPI_READ);
    if (ACPI_FAILURE (Status))
    {
        return_ACPI_STATUS (Status);
    }
    MergedDatum = RawDatum >> ObjDesc->CommonField.StartFieldBitOffset;
 
    /* Read the rest of the field */
 
    for (i = 1; i < FieldDatumCount; i++)
    {
        /* Get next input datum from the field */
 
        FieldOffset += ObjDesc->CommonField.AccessByteWidth;
        Status = AcpiExFieldDatumIo (
            ObjDesc, FieldOffset, &RawDatum, ACPI_READ);
        if (ACPI_FAILURE (Status))
        {
            return_ACPI_STATUS (Status);
        }
 
        /*
         * Merge with previous datum if necessary.
         *
         * Note: Before the shift, check if the shift value will be larger than
         * the integer size. If so, there is no need to perform the operation.
         * This avoids the differences in behavior between different compilers
         * concerning shift values larger than the target data width.
         */
        if (AccessBitWidth - ObjDesc->CommonField.StartFieldBitOffset <
            ACPI_INTEGER_BIT_SIZE)
        {
            MergedDatum |= RawDatum <<
                (AccessBitWidth - ObjDesc->CommonField.StartFieldBitOffset);
        }
 
        if (i == DatumCount)
        {
            break;
        }
 
        /* Write merged datum to target buffer */
 
        memcpy (((char *) Buffer) + BufferOffset, &MergedDatum,
            ACPI_MIN(ObjDesc->CommonField.AccessByteWidth,
                BufferLength - BufferOffset));
 
        BufferOffset += ObjDesc->CommonField.AccessByteWidth;
        MergedDatum = RawDatum >> ObjDesc->CommonField.StartFieldBitOffset;
    }
 
    /* Mask off any extra bits in the last datum */
 
    BufferTailBits = ObjDesc->CommonField.BitLength % AccessBitWidth;
    if (BufferTailBits)
    {
        MergedDatum &= ACPI_MASK_BITS_ABOVE (BufferTailBits);
    }
 
    /* Write the last datum to the buffer */
 
    memcpy (((char *) Buffer) + BufferOffset, &MergedDatum,
        ACPI_MIN(ObjDesc->CommonField.AccessByteWidth,
            BufferLength - BufferOffset));
 
    return_ACPI_STATUS (AE_OK);
}

Referenced by AcpiExFieldDatumIo(), and AcpiExReadDataFromField().

AcpiExFieldDatumIo()

static ACPI_STATUS AcpiExFieldDatumIo ( ACPI_OPERAND_OBJECT *  ObjDesc, UINT32  FieldDatumByteOffset, UINT64 *  Value, UINT32  ReadWrite  )

static

Definition at line 402 of file exfldio.c.

{
    ACPI_STATUS             Status;
    UINT64                  LocalValue;
 
 
    ACPI_FUNCTION_TRACE_U32 (ExFieldDatumIo, FieldDatumByteOffset);
 
 
    if (ReadWrite == ACPI_READ)
    {
        if (!Value)
        {
            LocalValue = 0;
 
            /* To support reads without saving return value */
            Value = &LocalValue;
        }
 
        /* Clear the entire return buffer first, [Very Important!] */
 
        *Value = 0;
    }
 
    /*
     * The four types of fields are:
     *
     * BufferField - Read/write from/to a Buffer
     * RegionField - Read/write from/to a Operation Region.
     * BankField   - Write to a Bank Register, then read/write from/to an
     *               OperationRegion
     * IndexField  - Write to an Index Register, then read/write from/to a
     *               Data Register
     */
    switch (ObjDesc->Common.Type)
    {
    case ACPI_TYPE_BUFFER_FIELD:
        /*
         * If the BufferField arguments have not been previously evaluated,
         * evaluate them now and save the results.
         */
        if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
        {
            Status = AcpiDsGetBufferFieldArguments (ObjDesc);
            if (ACPI_FAILURE (Status))
            {
                return_ACPI_STATUS (Status);
            }
        }
 
        if (ReadWrite == ACPI_READ)
        {
            /*
             * Copy the data from the source buffer.
             * Length is the field width in bytes.
             */
            memcpy (Value,
                (ObjDesc->BufferField.BufferObj)->Buffer.Pointer +
                    ObjDesc->BufferField.BaseByteOffset +
                    FieldDatumByteOffset,
                ObjDesc->CommonField.AccessByteWidth);
        }
        else
        {
            /*
             * Copy the data to the target buffer.
             * Length is the field width in bytes.
             */
            memcpy ((ObjDesc->BufferField.BufferObj)->Buffer.Pointer +
                ObjDesc->BufferField.BaseByteOffset +
                FieldDatumByteOffset,
                Value, ObjDesc->CommonField.AccessByteWidth);
        }
 
        Status = AE_OK;
        break;
 
    case ACPI_TYPE_LOCAL_BANK_FIELD:
        /*
         * Ensure that the BankValue is not beyond the capacity of
         * the register
         */
        if (AcpiExRegisterOverflow (ObjDesc->BankField.BankObj,
                (UINT64) ObjDesc->BankField.Value))
        {
            return_ACPI_STATUS (AE_AML_REGISTER_LIMIT);
        }
 
        /*
         * For BankFields, we must write the BankValue to the BankRegister
         * (itself a RegionField) before we can access the data.
         */
        Status = AcpiExInsertIntoField (ObjDesc->BankField.BankObj,
                    &ObjDesc->BankField.Value,
                    sizeof (ObjDesc->BankField.Value));
        if (ACPI_FAILURE (Status))
        {
            return_ACPI_STATUS (Status);
        }
 
        /*
         * Now that the Bank has been selected, fall through to the
         * RegionField case and write the datum to the Operation Region
         */
 
        ACPI_FALLTHROUGH;
 
    case ACPI_TYPE_LOCAL_REGION_FIELD:
        /*
         * For simple RegionFields, we just directly access the owning
         * Operation Region.
         */
        Status = AcpiExAccessRegion (
            ObjDesc, FieldDatumByteOffset, Value, ReadWrite);
        break;
 
    case ACPI_TYPE_LOCAL_INDEX_FIELD:
        /*
         * Ensure that the IndexValue is not beyond the capacity of
         * the register
         */
        if (AcpiExRegisterOverflow (ObjDesc->IndexField.IndexObj,
                (UINT64) ObjDesc->IndexField.Value))
        {
            return_ACPI_STATUS (AE_AML_REGISTER_LIMIT);
        }
 
        /* Write the index value to the IndexRegister (itself a RegionField) */
 
        FieldDatumByteOffset += ObjDesc->IndexField.Value;
 
        ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
            "Write to Index Register: Value %8.8X\n",
            FieldDatumByteOffset));
 
        Status = AcpiExInsertIntoField (ObjDesc->IndexField.IndexObj,
            &FieldDatumByteOffset, sizeof (FieldDatumByteOffset));
        if (ACPI_FAILURE (Status))
        {
            return_ACPI_STATUS (Status);
        }
 
        if (ReadWrite == ACPI_READ)
        {
            /* Read the datum from the DataRegister */
 
            ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
                "Read from Data Register\n"));
 
            Status = AcpiExExtractFromField (
                ObjDesc->IndexField.DataObj, Value, sizeof (UINT64));
        }
        else
        {
            /* Write the datum to the DataRegister */
 
            ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
                "Write to Data Register: Value %8.8X%8.8X\n",
                ACPI_FORMAT_UINT64 (*Value)));
 
            Status = AcpiExInsertIntoField (
                ObjDesc->IndexField.DataObj, Value, sizeof (UINT64));
        }
        break;
 
    default:
 
        ACPI_ERROR ((AE_INFO, "Wrong object type in field I/O %u",
            ObjDesc->Common.Type));
        Status = AE_AML_INTERNAL;
        break;
    }
 
    if (ACPI_SUCCESS (Status))
    {
        if (ReadWrite == ACPI_READ)
        {
            ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
                "Value Read %8.8X%8.8X, Width %u\n",
                ACPI_FORMAT_UINT64 (*Value),
                ObjDesc->CommonField.AccessByteWidth));
        }
        else
        {
            ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
                "Value Written %8.8X%8.8X, Width %u\n",
                ACPI_FORMAT_UINT64 (*Value),
                ObjDesc->CommonField.AccessByteWidth));
        }
    }
 
    return_ACPI_STATUS (Status);
}

Referenced by AcpiExExtractFromField(), and AcpiExWriteWithUpdateRule().

AcpiExInsertIntoField()

ACPI_STATUS AcpiExInsertIntoField	(	ACPI_OPERAND_OBJECT *	ObjDesc,
		void *	Buffer,
		UINT32	BufferLength
	)

Definition at line 883 of file exfldio.c.

{
    void                    *NewBuffer;
    ACPI_STATUS             Status;
    UINT64                  Mask;
    UINT64                  WidthMask;
    UINT64                  MergedDatum;
    UINT64                  RawDatum = 0;
    UINT32                  FieldOffset = 0;
    UINT32                  BufferOffset = 0;
    UINT32                  BufferTailBits;
    UINT32                  DatumCount;
    UINT32                  FieldDatumCount;
    UINT32                  AccessBitWidth;
    UINT32                  RequiredLength;
    UINT32                  i;
 
 
    ACPI_FUNCTION_TRACE (ExInsertIntoField);
 
 
    /* Validate input buffer */
 
    NewBuffer = NULL;
    RequiredLength = ACPI_ROUND_BITS_UP_TO_BYTES (
        ObjDesc->CommonField.BitLength);
 
    /*
     * We must have a buffer that is at least as long as the field
     * we are writing to. This is because individual fields are
     * indivisible and partial writes are not supported -- as per
     * the ACPI specification.
     */
    if (BufferLength < RequiredLength)
    {
        /* We need to create a new buffer */
 
        NewBuffer = ACPI_ALLOCATE_ZEROED (RequiredLength);
        if (!NewBuffer)
        {
            return_ACPI_STATUS (AE_NO_MEMORY);
        }
 
        /*
         * Copy the original data to the new buffer, starting
         * at Byte zero. All unused (upper) bytes of the
         * buffer will be 0.
         */
        memcpy ((char *) NewBuffer, (char *) Buffer, BufferLength);
        Buffer = NewBuffer;
        BufferLength = RequiredLength;
    }
 
/* TBD: Move to common setup code */
 
    /* Algo is limited to sizeof(UINT64), so cut the AccessByteWidth */
    if (ObjDesc->CommonField.AccessByteWidth > sizeof (UINT64))
    {
        ObjDesc->CommonField.AccessByteWidth = sizeof (UINT64);
    }
 
    AccessBitWidth = ACPI_MUL_8 (ObjDesc->CommonField.AccessByteWidth);
 
    /* Create the bitmasks used for bit insertion */
 
    WidthMask = ACPI_MASK_BITS_ABOVE_64 (AccessBitWidth);
    Mask = WidthMask &
        ACPI_MASK_BITS_BELOW (ObjDesc->CommonField.StartFieldBitOffset);
 
    /* Compute the number of datums (access width data items) */
 
    DatumCount = ACPI_ROUND_UP_TO (ObjDesc->CommonField.BitLength,
        AccessBitWidth);
 
    FieldDatumCount = ACPI_ROUND_UP_TO (ObjDesc->CommonField.BitLength +
        ObjDesc->CommonField.StartFieldBitOffset,
        AccessBitWidth);
 
    /* Get initial Datum from the input buffer */
 
    memcpy (&RawDatum, Buffer,
        ACPI_MIN(ObjDesc->CommonField.AccessByteWidth,
            BufferLength - BufferOffset));
 
    MergedDatum = RawDatum << ObjDesc->CommonField.StartFieldBitOffset;
 
    /* Write the entire field */
 
    for (i = 1; i < FieldDatumCount; i++)
    {
        /* Write merged datum to the target field */
 
        MergedDatum &= Mask;
        Status = AcpiExWriteWithUpdateRule (
            ObjDesc, Mask, MergedDatum, FieldOffset);
        if (ACPI_FAILURE (Status))
        {
            goto Exit;
        }
 
        FieldOffset += ObjDesc->CommonField.AccessByteWidth;
 
        /*
         * Start new output datum by merging with previous input datum
         * if necessary.
         *
         * Note: Before the shift, check if the shift value will be larger than
         * the integer size. If so, there is no need to perform the operation.
         * This avoids the differences in behavior between different compilers
         * concerning shift values larger than the target data width.
         */
        if ((AccessBitWidth - ObjDesc->CommonField.StartFieldBitOffset) <
            ACPI_INTEGER_BIT_SIZE)
        {
            MergedDatum = RawDatum >>
                (AccessBitWidth - ObjDesc->CommonField.StartFieldBitOffset);
        }
        else
        {
            MergedDatum = 0;
        }
 
        Mask = WidthMask;
 
        if (i == DatumCount)
        {
            break;
        }
 
        /* Get the next input datum from the buffer */
 
        BufferOffset += ObjDesc->CommonField.AccessByteWidth;
        memcpy (&RawDatum, ((char *) Buffer) + BufferOffset,
            ACPI_MIN(ObjDesc->CommonField.AccessByteWidth,
                 BufferLength - BufferOffset));
 
        MergedDatum |= RawDatum << ObjDesc->CommonField.StartFieldBitOffset;
    }
 
    /* Mask off any extra bits in the last datum */
 
    BufferTailBits = (ObjDesc->CommonField.BitLength +
        ObjDesc->CommonField.StartFieldBitOffset) % AccessBitWidth;
    if (BufferTailBits)
    {
        Mask &= ACPI_MASK_BITS_ABOVE (BufferTailBits);
    }
 
    /* Write the last datum to the field */
 
    MergedDatum &= Mask;
    Status = AcpiExWriteWithUpdateRule (
        ObjDesc, Mask, MergedDatum, FieldOffset);
 
Exit:
    /* Free temporary buffer if we used one */
 
    if (NewBuffer)
    {
        ACPI_FREE (NewBuffer);
    }
    return_ACPI_STATUS (Status);
}

Referenced by AcpiExFieldDatumIo(), and AcpiExWriteDataToField().

AcpiExRegisterOverflow()

static BOOLEAN AcpiExRegisterOverflow ( ACPI_OPERAND_OBJECT *  ObjDesc, UINT64  Value  )

static

Definition at line 349 of file exfldio.c.

{
 
    if (ObjDesc->CommonField.BitLength >= ACPI_INTEGER_BIT_SIZE)
    {
        /*
         * The field is large enough to hold the maximum integer, so we can
         * never overflow it.
         */
        return (FALSE);
    }
 
    if (Value >= ((UINT64) 1 << ObjDesc->CommonField.BitLength))
    {
        /*
         * The Value is larger than the maximum value that can fit into
         * the register.
         */
        ACPI_ERROR ((AE_INFO,
            "Index value 0x%8.8X%8.8X overflows field width 0x%X",
            ACPI_FORMAT_UINT64 (Value),
            ObjDesc->CommonField.BitLength));
 
        return (TRUE);
    }
 
    /* The Value will fit into the field with no truncation */
 
    return (FALSE);
}

Referenced by AcpiExFieldDatumIo().

AcpiExSetupRegion()

static ACPI_STATUS AcpiExSetupRegion ( ACPI_OPERAND_OBJECT *  ObjDesc, UINT32  FieldDatumByteOffset  )

static

Definition at line 92 of file exfldio.c.

{
    ACPI_STATUS             Status = AE_OK;
    ACPI_OPERAND_OBJECT     *RgnDesc;
    UINT8                   SpaceId;
 
 
    ACPI_FUNCTION_TRACE_U32 (ExSetupRegion, FieldDatumByteOffset);
 
 
    RgnDesc = ObjDesc->CommonField.RegionObj;
 
    /* We must have a valid region */
 
    if (RgnDesc->Common.Type != ACPI_TYPE_REGION)
    {
        ACPI_ERROR ((AE_INFO, "Needed Region, found type 0x%X (%s)",
            RgnDesc->Common.Type,
            AcpiUtGetObjectTypeName (RgnDesc)));
 
        return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
    }
 
    SpaceId = RgnDesc->Region.SpaceId;
 
    /* Validate the Space ID */
 
    if (!AcpiIsValidSpaceId (SpaceId))
    {
        ACPI_ERROR ((AE_INFO,
            "Invalid/unknown Address Space ID: 0x%2.2X", SpaceId));
        return_ACPI_STATUS (AE_AML_INVALID_SPACE_ID);
    }
 
    /*
     * If the Region Address and Length have not been previously evaluated,
     * evaluate them now and save the results.
     */
    if (!(RgnDesc->Common.Flags & AOPOBJ_DATA_VALID))
    {
        Status = AcpiDsGetRegionArguments (RgnDesc);
        if (ACPI_FAILURE (Status))
        {
            return_ACPI_STATUS (Status);
        }
    }
 
    /*
     * Exit now for SMBus, GSBus or IPMI address space, it has a non-linear
     * address space and the request cannot be directly validated
     */
    if (SpaceId == ACPI_ADR_SPACE_SMBUS ||
        SpaceId == ACPI_ADR_SPACE_GSBUS ||
        SpaceId == ACPI_ADR_SPACE_IPMI)
    {
        /* SMBus or IPMI has a non-linear address space */
 
        return_ACPI_STATUS (AE_OK);
    }
 
#ifdef ACPI_UNDER_DEVELOPMENT
    /*
     * If the Field access is AnyAcc, we can now compute the optimal
     * access (because we know the length of the parent region)
     */
    if (!(ObjDesc->Common.Flags & AOPOBJ_DATA_VALID))
    {
        if (ACPI_FAILURE (Status))
        {
            return_ACPI_STATUS (Status);
        }
    }
#endif
 
    /*
     * Validate the request. The entire request from the byte offset for a
     * length of one field datum (access width) must fit within the region.
     * (Region length is specified in bytes)
     */
    if (RgnDesc->Region.Length <
        (ObjDesc->CommonField.BaseByteOffset + FieldDatumByteOffset +
        ObjDesc->CommonField.AccessByteWidth))
    {
        if (AcpiGbl_EnableInterpreterSlack)
        {
            /*
             * Slack mode only:  We will go ahead and allow access to this
             * field if it is within the region length rounded up to the next
             * access width boundary. ACPI_SIZE cast for 64-bit compile.
             */
            if (ACPI_ROUND_UP (RgnDesc->Region.Length,
                    ObjDesc->CommonField.AccessByteWidth) >=
                ((ACPI_SIZE) ObjDesc->CommonField.BaseByteOffset +
                    ObjDesc->CommonField.AccessByteWidth +
                    FieldDatumByteOffset))
            {
                return_ACPI_STATUS (AE_OK);
            }
        }
 
        if (RgnDesc->Region.Length < ObjDesc->CommonField.AccessByteWidth)
        {
            /*
             * This is the case where the AccessType (AccWord, etc.) is wider
             * than the region itself. For example, a region of length one
             * byte, and a field with Dword access specified.
             */
            ACPI_ERROR ((AE_INFO,
                "Field [%4.4s] access width (%u bytes) "
                "too large for region [%4.4s] (length %u)",
                AcpiUtGetNodeName (ObjDesc->CommonField.Node),
                ObjDesc->CommonField.AccessByteWidth,
                AcpiUtGetNodeName (RgnDesc->Region.Node),
                RgnDesc->Region.Length));
        }
 
        /*
         * Offset rounded up to next multiple of field width
         * exceeds region length, indicate an error
         */
        ACPI_ERROR ((AE_INFO,
            "Field [%4.4s] Base+Offset+Width %u+%u+%u "
            "is beyond end of region [%4.4s] (length %u)",
            AcpiUtGetNodeName (ObjDesc->CommonField.Node),
            ObjDesc->CommonField.BaseByteOffset,
            FieldDatumByteOffset, ObjDesc->CommonField.AccessByteWidth,
            AcpiUtGetNodeName (RgnDesc->Region.Node),
            RgnDesc->Region.Length));
 
        return_ACPI_STATUS (AE_AML_REGION_LIMIT);
    }
 
    return_ACPI_STATUS (AE_OK);
}

Referenced by AcpiExAccessRegion().

AcpiExWriteWithUpdateRule()

ACPI_STATUS AcpiExWriteWithUpdateRule	(	ACPI_OPERAND_OBJECT *	ObjDesc,
		UINT64	Mask,
		UINT64	FieldValue,
		UINT32	FieldDatumByteOffset
	)

Definition at line 617 of file exfldio.c.

{
    ACPI_STATUS             Status = AE_OK;
    UINT64                  MergedValue;
    UINT64                  CurrentValue;
 
 
    ACPI_FUNCTION_TRACE_U32 (ExWriteWithUpdateRule, Mask);
 
 
    /* Start with the new bits  */
 
    MergedValue = FieldValue;
 
    /* If the mask is all ones, we don't need to worry about the update rule */
 
    if (Mask != ACPI_UINT64_MAX)
    {
        /* Decode the update rule */
 
        switch (ObjDesc->CommonField.FieldFlags & AML_FIELD_UPDATE_RULE_MASK)
        {
        case AML_FIELD_UPDATE_PRESERVE:
            /*
             * Check if update rule needs to be applied (not if mask is all
             * ones)  The left shift drops the bits we want to ignore.
             */
            if ((~Mask << (ACPI_MUL_8 (sizeof (Mask)) -
                   ACPI_MUL_8 (ObjDesc->CommonField.AccessByteWidth))) != 0)
            {
                /*
                 * Read the current contents of the byte/word/dword containing
                 * the field, and merge with the new field value.
                 */
                Status = AcpiExFieldDatumIo (
                    ObjDesc, FieldDatumByteOffset, &CurrentValue, ACPI_READ);
                if (ACPI_FAILURE (Status))
                {
                    return_ACPI_STATUS (Status);
                }
 
                MergedValue |= (CurrentValue & ~Mask);
            }
            break;
 
        case AML_FIELD_UPDATE_WRITE_AS_ONES:
 
            /* Set positions outside the field to all ones */
 
            MergedValue |= ~Mask;
            break;
 
        case AML_FIELD_UPDATE_WRITE_AS_ZEROS:
 
            /* Set positions outside the field to all zeros */
 
            MergedValue &= Mask;
            break;
 
        default:
 
            ACPI_ERROR ((AE_INFO,
                "Unknown UpdateRule value: 0x%X",
                (ObjDesc->CommonField.FieldFlags &
                    AML_FIELD_UPDATE_RULE_MASK)));
            return_ACPI_STATUS (AE_AML_OPERAND_VALUE);
        }
    }
 
    ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
        "Mask %8.8X%8.8X, DatumOffset %X, Width %X, "
        "Value %8.8X%8.8X, MergedValue %8.8X%8.8X\n",
        ACPI_FORMAT_UINT64 (Mask),
        FieldDatumByteOffset,
        ObjDesc->CommonField.AccessByteWidth,
        ACPI_FORMAT_UINT64 (FieldValue),
        ACPI_FORMAT_UINT64 (MergedValue)));
 
    /* Write the merged value */
 
    Status = AcpiExFieldDatumIo (
        ObjDesc, FieldDatumByteOffset, &MergedValue, ACPI_WRITE);
 
    return_ACPI_STATUS (Status);
}

Referenced by AcpiExInsertIntoField().