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Bug fix to split "AccessBitWidth" into 2 pieces of information - width

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and alignment.


date	2001.07.12.19.56.00;	author rmoore1;	state Exp;
This commit is contained in:
aystarik 2005-06-29 17:42:47 +00:00
parent a9c7a42a79
commit f1cb82111a
1 changed files with 24 additions and 8 deletions
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32
source/components/executer/exprep.c
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@ -2,7 +2,7 @@
/******************************************************************************
*
* Module Name: exprep - ACPI AML (p-code) execution - field prep utilities
* $Revision: 1.90 $
* $Revision: 1.91 $
*
*****************************************************************************/
@ -144,13 +144,16 @@
static UINT32
AcpiExDecodeFieldAccessType (
UINT32 Access,
UINT16 Length)
UINT16 Length,
UINT32 *Alignment)
{
switch (Access)
{
case ACCESS_ANY_ACC:
*Alignment = 8;
/* Use the length to set the access type */
if (Length <= 8)
@ -176,18 +179,22 @@ AcpiExDecodeFieldAccessType (
break;
case ACCESS_BYTE_ACC:
*Alignment = 8;
return (8);
break;
case ACCESS_WORD_ACC:
*Alignment = 16;
return (16);
break;
case ACCESS_DWORD_ACC:
*Alignment = 32;
return (32);
break;
case ACCESS_QWORD_ACC: /* ACPI 2.0 */
*Alignment = 64;
return (64);
break;
@ -228,6 +235,7 @@ AcpiExPrepCommonFieldObject (
UINT32 FieldBitLength)
{
UINT32 AccessBitWidth;
UINT32 Alignment;
UINT32 NearestByteAddress;
@ -250,11 +258,18 @@ AcpiExPrepCommonFieldObject (
ObjDesc->CommonField.BitLength = (UINT16) FieldBitLength;
/* Decode the access type so we can compute offsets */
/*
* Decode the access type so we can compute offsets. The access type gives
* two pieces of information - the width of each field access and the
* necessary alignment of the access. For AnyAcc, the width used is the
* largest necessary/possible in an attempt to access the whole field in one
* I/O operation. However, for AnyAcc, the alignment is 8. For all other
* access types (Byte, Word, Dword, Qword), the width is the same as the
* alignment.
*/
AccessBitWidth = AcpiExDecodeFieldAccessType (
((FieldFlags & ACCESS_TYPE_MASK) >> ACCESS_TYPE_SHIFT),
ObjDesc->Field.BitLength);
ObjDesc->Field.BitLength, &Alignment);
if (!AccessBitWidth)
{
return_ACPI_STATUS (AE_AML_OPERAND_VALUE);
@ -269,9 +284,10 @@ AcpiExPrepCommonFieldObject (
{
/*
* BufferField access can be on any byte boundary, so the
* granularity is always 8
* alignment is always 8 (regardless of any alignment implied by the
* field access type.)
*/
AccessBitWidth = 8;
Alignment = 8;
}
@ -282,7 +298,7 @@ AcpiExPrepCommonFieldObject (
*/
NearestByteAddress = ROUND_BITS_DOWN_TO_BYTES (FieldBitPosition);
ObjDesc->CommonField.BaseByteOffset = ROUND_DOWN (NearestByteAddress,
DIV_8 (AccessBitWidth));
DIV_8 (Alignment));
/*
* StartFieldBitOffset is the offset of the first bit of the field within a field datum.