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Modifications to read/write to address bit offset translation of

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buffers


date	2000.03.24.23.57.00;	author mwalz;	state Exp;
This commit is contained in:
aystarik 2005-06-29 17:27:56 +00:00
parent 327322df3f
commit 8f0803680a
1 changed files with 17 additions and 32 deletions
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49
source/components/executer/exfldio.c
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@ -254,12 +254,12 @@ AmlReadField (
UINT32 ByteGranularity)
{
ACPI_STATUS Status;
UINT32 MergedDatum;
UINT32 ThisFieldByteOffset;
UINT32 ThisFieldDatumOffset;
UINT32 PreviousRawDatum;
UINT32 ThisRawDatum;
UINT32 ValidFieldBits;
// UINT32 ValidFieldBits;
UINT32 MergedDatum = 0;
FUNCTION_TRACE ("AmlReadField");
@ -307,6 +307,21 @@ AmlReadField (
goto Cleanup;
}
/* Before merging the data, make sure the unused bits are clear */
switch (ByteGranularity)
{
case 1:
ThisRawDatum &= 0x000000FF;
PreviousRawDatum &= 0x000000FF;
break;
case 2:
ThisRawDatum &= 0x0000FFFF;
PreviousRawDatum &= 0x0000FFFF;
break;
}
/* Put together bits of the two raw data to make a complete field datum */
if (ObjDesc->Field.BitOffset != 0)
@ -348,36 +363,6 @@ AmlReadField (
} /* while */
}
/* Cleanup the last datum if necessary by zeroing the bits that aren't part of the field */
ValidFieldBits = ((ObjDesc->FieldUnit.Length % BitGranularity) + ObjDesc->Field.BitOffset);
if (ValidFieldBits)
{
MergedDatum &= (((UINT32) 1 << ValidFieldBits) - (UINT32) 1);
}
ThisFieldDatumOffset--;
/* Store the last datum again (might actually be the first, or it might be fixed from above */
switch (ByteGranularity)
{
case 1:
((UINT8 *) Buffer) [ThisFieldDatumOffset] = (UINT8) MergedDatum;
break;
case 2:
((UINT16 *) Buffer) [ThisFieldDatumOffset] = (UINT16) MergedDatum;
break;
case 4:
((UINT32 *) Buffer) [ThisFieldDatumOffset] = (UINT32) MergedDatum;
break;
}
Cleanup:
return_ACPI_STATUS (Status);