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[NTVDM]

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Fix the XMS driver. AH = 08h is supposed to return the size of the
largest free block in AX, and the total amount of *free* memory
in DX.


svn path=/trunk/; revision=67675
This commit is contained in:
Aleksandar Andrejevic 2015-05-12 03:37:00 +00:00
parent c0e9ec7940
commit 367a28ce87
1 changed files with 24 additions and 2 deletions
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26
reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/himem.c
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@ -185,6 +185,28 @@ static inline PXMS_HANDLE GetHandleRecord(WORD Handle)
return Entry->Size ? Entry : NULL;
}
static WORD XmsGetLargestFreeBlock(VOID)
{
WORD Result = 0;
DWORD CurrentIndex = 0;
ULONG RunStart;
ULONG RunSize;
while (CurrentIndex < XMS_BLOCKS)
{
RunSize = RtlFindNextForwardRunClear(&AllocBitmap, CurrentIndex, &RunStart);
if (RunSize == 0) break;
/* Update the maximum */
if (RunSize > Result) Result = RunSize;
/* Go to the next run */
CurrentIndex = RunStart + RunSize;
}
return Result;
}
static CHAR XmsAlloc(WORD Size, PWORD Handle)
{
BYTE i;
@ -380,8 +402,8 @@ static VOID WINAPI XmsBopProcedure(LPWORD Stack)
/* Query Free Extended Memory */
case 0x08:
{
setAX(FreeBlocks);
setDX(XMS_BLOCKS);
setAX(XmsGetLargestFreeBlock());
setDX(FreeBlocks);
setBL(XMS_STATUS_SUCCESS);
break;
}