static ACPI_STATUS
AcpiDsInitBufferField (
UINT16 AmlOpcode,
ACPI_OPERAND_OBJECT *ObjDesc,
ACPI_OPERAND_OBJECT *BufferDesc,
ACPI_OPERAND_OBJECT *OffsetDesc,
ACPI_OPERAND_OBJECT *LengthDesc,
ACPI_OPERAND_OBJECT *ResultDesc)
{
UINT32 Offset;
UINT32 BitOffset;
UINT32 BitCount;
UINT8 FieldFlags;
ACPI_STATUS Status;
ACPI_FUNCTION_TRACE_PTR (DsInitBufferField, ObjDesc);
/* Host object must be a Buffer */
if (BufferDesc->Common.Type != ACPI_TYPE_BUFFER)
{
ACPI_ERROR ((AE_INFO,
"Target of Create Field is not a Buffer object - %s",
AcpiUtGetObjectTypeName (BufferDesc)));
Status = AE_AML_OPERAND_TYPE;
goto Cleanup;
}
/*
* The last parameter to all of these opcodes (ResultDesc) started
* out as a NameString, and should therefore now be a NS node
* after resolution in AcpiExResolveOperands().
*/
if (ACPI_GET_DESCRIPTOR_TYPE (ResultDesc) != ACPI_DESC_TYPE_NAMED)
{
ACPI_ERROR ((AE_INFO,
"(%s) destination not a NS Node [%s]",
AcpiPsGetOpcodeName (AmlOpcode),
AcpiUtGetDescriptorName (ResultDesc)));
Status = AE_AML_OPERAND_TYPE;
goto Cleanup;
}
Offset = (UINT32) OffsetDesc->Integer.Value;
/*
* Setup the Bit offsets and counts, according to the opcode
*/
switch (AmlOpcode)
{
case AML_CREATE_FIELD_OP:
/* Offset is in bits, count is in bits */
FieldFlags = AML_FIELD_ACCESS_BYTE;
BitOffset = Offset;
BitCount = (UINT32) LengthDesc->Integer.Value;
/* Must have a valid (>0) bit count */
if (BitCount == 0)
{
ACPI_ERROR ((AE_INFO,
"Attempt to CreateField of length zero"));
Status = AE_AML_OPERAND_VALUE;
goto Cleanup;
}
break;
case AML_CREATE_BIT_FIELD_OP:
/* Offset is in bits, Field is one bit */
BitOffset = Offset;
BitCount = 1;
FieldFlags = AML_FIELD_ACCESS_BYTE;
break;
case AML_CREATE_BYTE_FIELD_OP:
/* Offset is in bytes, field is one byte */
BitOffset = 8 * Offset;
BitCount = 8;
FieldFlags = AML_FIELD_ACCESS_BYTE;
break;
case AML_CREATE_WORD_FIELD_OP:
/* Offset is in bytes, field is one word */
BitOffset = 8 * Offset;
BitCount = 16;
FieldFlags = AML_FIELD_ACCESS_WORD;
break;
case AML_CREATE_DWORD_FIELD_OP:
/* Offset is in bytes, field is one dword */
BitOffset = 8 * Offset;
BitCount = 32;
FieldFlags = AML_FIELD_ACCESS_DWORD;
break;
case AML_CREATE_QWORD_FIELD_OP:
/* Offset is in bytes, field is one qword */
BitOffset = 8 * Offset;
BitCount = 64;
FieldFlags = AML_FIELD_ACCESS_QWORD;
break;
default:
ACPI_ERROR ((AE_INFO,
"Unknown field creation opcode 0x%02X",
AmlOpcode));
Status = AE_AML_BAD_OPCODE;
goto Cleanup;
}
/* Entire field must fit within the current length of the buffer */
if ((BitOffset + BitCount) >
(8 * (UINT32) BufferDesc->Buffer.Length))
{
ACPI_ERROR ((AE_INFO,
"Field [%4.4s] at %u exceeds Buffer [%4.4s] size %u (bits)",
AcpiUtGetNodeName (ResultDesc),
BitOffset + BitCount,
AcpiUtGetNodeName (BufferDesc->Buffer.Node),
8 * (UINT32) BufferDesc->Buffer.Length));
Status = AE_AML_BUFFER_LIMIT;
goto Cleanup;
}
/*
* Initialize areas of the field object that are common to all fields
* For FieldFlags, use LOCK_RULE = 0 (NO_LOCK),
* UPDATE_RULE = 0 (UPDATE_PRESERVE)
*/
Status = AcpiExPrepCommonFieldObject (ObjDesc, FieldFlags, 0,
BitOffset, BitCount);
if (ACPI_FAILURE (Status))
{
goto Cleanup;
}
ObjDesc->BufferField.BufferObj = BufferDesc;
/* Reference count for BufferDesc inherits ObjDesc count */
BufferDesc->Common.ReferenceCount = (UINT16)
(BufferDesc->Common.ReferenceCount + ObjDesc->Common.ReferenceCount);
Cleanup:
/* Always delete the operands */
AcpiUtRemoveReference (OffsetDesc);
AcpiUtRemoveReference (BufferDesc);
if (AmlOpcode == AML_CREATE_FIELD_OP)
{
AcpiUtRemoveReference (LengthDesc);
}
/* On failure, delete the result descriptor */
if (ACPI_FAILURE (Status))
{
AcpiUtRemoveReference (ResultDesc); /* Result descriptor */
}
else
{
/* Now the address and length are valid for this BufferField */
ObjDesc->BufferField.Flags |= AOPOBJ_DATA_VALID;
}
return_ACPI_STATUS (Status);
}
ACPI_STATUS
AcpiExPrepFieldValue (
ACPI_CREATE_FIELD_INFO *Info)
{
ACPI_OPERAND_OBJECT *ObjDesc;
ACPI_OPERAND_OBJECT *SecondDesc = NULL;
ACPI_STATUS Status;
UINT32 AccessByteWidth;
UINT32 Type;
ACPI_FUNCTION_TRACE (ExPrepFieldValue);
/* Parameter validation */
if (Info->FieldType != ACPI_TYPE_LOCAL_INDEX_FIELD)
{
if (!Info->RegionNode)
{
ACPI_ERROR ((AE_INFO, "Null RegionNode"));
return_ACPI_STATUS (AE_AML_NO_OPERAND);
}
Type = AcpiNsGetType (Info->RegionNode);
if (Type != ACPI_TYPE_REGION)
{
ACPI_ERROR ((AE_INFO, "Needed Region, found type 0x%X (%s)",
Type, AcpiUtGetTypeName (Type)));
return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
}
}
/* Allocate a new field object */
ObjDesc = AcpiUtCreateInternalObject (Info->FieldType);
if (!ObjDesc)
{
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Initialize areas of the object that are common to all fields */
ObjDesc->CommonField.Node = Info->FieldNode;
Status = AcpiExPrepCommonFieldObject (ObjDesc,
Info->FieldFlags, Info->Attribute,
Info->FieldBitPosition, Info->FieldBitLength);
if (ACPI_FAILURE (Status))
{
AcpiUtDeleteObjectDesc (ObjDesc);
return_ACPI_STATUS (Status);
}
/* Initialize areas of the object that are specific to the field type */
switch (Info->FieldType)
{
case ACPI_TYPE_LOCAL_REGION_FIELD:
ObjDesc->Field.RegionObj = AcpiNsGetAttachedObject (Info->RegionNode);
/* Fields specific to GenericSerialBus fields */
ObjDesc->Field.AccessLength = Info->AccessLength;
if (Info->ConnectionNode)
{
SecondDesc = Info->ConnectionNode->Object;
if (!(SecondDesc->Common.Flags & AOPOBJ_DATA_VALID))
{
Status = AcpiDsGetBufferArguments (SecondDesc);
if (ACPI_FAILURE (Status))
{
AcpiUtDeleteObjectDesc (ObjDesc);
return_ACPI_STATUS (Status);
}
}
ObjDesc->Field.ResourceBuffer = SecondDesc->Buffer.Pointer;
ObjDesc->Field.ResourceLength = (UINT16) SecondDesc->Buffer.Length;
}
else if (Info->ResourceBuffer)
{
ObjDesc->Field.ResourceBuffer = Info->ResourceBuffer;
ObjDesc->Field.ResourceLength = Info->ResourceLength;
}
/* Allow full data read from EC address space */
if ((ObjDesc->Field.RegionObj->Region.SpaceId == ACPI_ADR_SPACE_EC) &&
(ObjDesc->CommonField.BitLength > 8))
{
AccessByteWidth = ACPI_ROUND_BITS_UP_TO_BYTES (
ObjDesc->CommonField.BitLength);
/* Maximum byte width supported is 255 */
if (AccessByteWidth < 256)
{
ObjDesc->CommonField.AccessByteWidth = (UINT8) AccessByteWidth;
}
}
/* An additional reference for the container */
AcpiUtAddReference (ObjDesc->Field.RegionObj);
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"RegionField: BitOff %X, Off %X, Gran %X, Region %p\n",
ObjDesc->Field.StartFieldBitOffset, ObjDesc->Field.BaseByteOffset,
ObjDesc->Field.AccessByteWidth, ObjDesc->Field.RegionObj));
break;
case ACPI_TYPE_LOCAL_BANK_FIELD:
ObjDesc->BankField.Value = Info->BankValue;
ObjDesc->BankField.RegionObj =
AcpiNsGetAttachedObject (Info->RegionNode);
ObjDesc->BankField.BankObj =
AcpiNsGetAttachedObject (Info->RegisterNode);
/* An additional reference for the attached objects */
AcpiUtAddReference (ObjDesc->BankField.RegionObj);
AcpiUtAddReference (ObjDesc->BankField.BankObj);
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"Bank Field: BitOff %X, Off %X, Gran %X, Region %p, BankReg %p\n",
ObjDesc->BankField.StartFieldBitOffset,
ObjDesc->BankField.BaseByteOffset,
ObjDesc->Field.AccessByteWidth,
ObjDesc->BankField.RegionObj,
ObjDesc->BankField.BankObj));
/*
* Remember location in AML stream of the field unit
* opcode and operands -- since the BankValue
* operands must be evaluated.
*/
SecondDesc = ObjDesc->Common.NextObject;
SecondDesc->Extra.AmlStart = ACPI_CAST_PTR (ACPI_PARSE_OBJECT,
Info->DataRegisterNode)->Named.Data;
SecondDesc->Extra.AmlLength = ACPI_CAST_PTR (ACPI_PARSE_OBJECT,
Info->DataRegisterNode)->Named.Length;
break;
case ACPI_TYPE_LOCAL_INDEX_FIELD:
/* Get the Index and Data registers */
ObjDesc->IndexField.IndexObj =
AcpiNsGetAttachedObject (Info->RegisterNode);
ObjDesc->IndexField.DataObj =
AcpiNsGetAttachedObject (Info->DataRegisterNode);
if (!ObjDesc->IndexField.DataObj || !ObjDesc->IndexField.IndexObj)
{
ACPI_ERROR ((AE_INFO, "Null Index Object during field prep"));
AcpiUtDeleteObjectDesc (ObjDesc);
return_ACPI_STATUS (AE_AML_INTERNAL);
}
/* An additional reference for the attached objects */
AcpiUtAddReference (ObjDesc->IndexField.DataObj);
AcpiUtAddReference (ObjDesc->IndexField.IndexObj);
/*
* April 2006: Changed to match MS behavior
*
* The value written to the Index register is the byte offset of the
* target field in units of the granularity of the IndexField
*
* Previously, the value was calculated as an index in terms of the
* width of the Data register, as below:
*
* ObjDesc->IndexField.Value = (UINT32)
* (Info->FieldBitPosition / ACPI_MUL_8 (
* ObjDesc->Field.AccessByteWidth));
*
* February 2006: Tried value as a byte offset:
* ObjDesc->IndexField.Value = (UINT32)
* ACPI_DIV_8 (Info->FieldBitPosition);
*/
ObjDesc->IndexField.Value = (UINT32) ACPI_ROUND_DOWN (
ACPI_DIV_8 (Info->FieldBitPosition),
ObjDesc->IndexField.AccessByteWidth);
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"IndexField: BitOff %X, Off %X, Value %X, Gran %X, Index %p, Data %p\n",
ObjDesc->IndexField.StartFieldBitOffset,
ObjDesc->IndexField.BaseByteOffset,
ObjDesc->IndexField.Value,
ObjDesc->Field.AccessByteWidth,
ObjDesc->IndexField.IndexObj,
ObjDesc->IndexField.DataObj));
break;
default:
/* No other types should get here */
break;
}
/*
* Store the constructed descriptor (ObjDesc) into the parent Node,
* preserving the current type of that NamedObj.
*/
Status = AcpiNsAttachObject (Info->FieldNode, ObjDesc,
AcpiNsGetType (Info->FieldNode));
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "Set NamedObj %p [%4.4s], ObjDesc %p\n",
Info->FieldNode, AcpiUtGetNodeName (Info->FieldNode), ObjDesc));
/* Remove local reference to the object */
AcpiUtRemoveReference (ObjDesc);
return_ACPI_STATUS (Status);
}
