41 lines
1.1 KiB
C
41 lines
1.1 KiB
C
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// $Header: G:/SwDev/WDM/Video/bt848/rcs/Physaddr.h 1.3 1998/04/29 22:43:34 tomz Exp $
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#ifndef __PHYSADDR_H
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#define __PHYSADDR_H
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inline DWORD GetPhysAddr( DataBuf &buf )
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{
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ULONG len = 0;
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return StreamClassGetPhysicalAddress( buf.pSrb_->HwDeviceExtension, buf.pSrb_,
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buf.pData_, SRBDataBuffer, &len ).LowPart;
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}
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/* Function: IsSumAbovePage
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* Purpose: Sees if sum of 2 numbers is bigger then page
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* Input: first: DWORD
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* second: DWORD,
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* Output: bool
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*/
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inline bool IsSumAbovePage( DWORD first, DWORD second )
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{
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return bool( BYTE_OFFSET( first ) + BYTE_OFFSET( second ) > ( PAGE_SIZE - 1 ) );
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// return bool( ( first & 0xFFF ) + ( second & 0xFFF ) > 0xFFF );
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}
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/* Function: Need2Split
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* Purpose: Sees if a scan line needs to be broken into 2 instructions
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* Input: dwAddr: DWORD, address
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* wCOunt: WORD, byte count
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* Output: bool
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*/
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inline bool Need2Split( DataBuf &buf, WORD wCount )
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{
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DataBuf tmp = buf;
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tmp.pData_ += wCount;
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return bool( IsSumAbovePage( DWORD( buf.pData_ ), wCount ) &&
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( GetPhysAddr( tmp ) - GetPhysAddr( buf ) != wCount ) );
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}
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#endif
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