146 lines
3.8 KiB
C
146 lines
3.8 KiB
C
/*++
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Copyright (c) 1988-1992 Microsoft Corporation
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Module Name:
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Align.h
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Abstract:
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BUGBUG
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Author:
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John Rogers (JohnRo) 15-May-1991
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Environment:
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This code assumes that sizeof(DWORD) >= sizeof(LPVOID).
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Revision History:
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15-May-1991 JohnRo
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Created align.h for NT/LAN from OS/2 1.2 HPFS pbmacros.h.
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19-Jun-1991 JohnRo
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Make sure pointer-to-wider-then-byte doesn't get messed up.
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10-Jul-1991 JohnRo
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Added ALIGN_BYTE and ALIGN_CHAR for completeness.
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21-Aug-1991 CliffV
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Fix ROUND_DOWN_* to include ~
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03-Dec-1991 JohnRo
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Worst-case on MIPS is 8-byte alignment.
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Added COUNT_IS_ALIGNED() and POINTER_IS_ALIGNED() macros.
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26-Jun-1992 JohnRo
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RAID 9933: ALIGN_WORST should be 8 for x86 builds.
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--*/
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#ifndef _ALIGN_
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#define _ALIGN_
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// BOOL
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// COUNT_IS_ALIGNED(
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// IN DWORD Count,
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// IN DWORD Pow2 // undefined if this isn't a power of 2.
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// );
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//
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#define COUNT_IS_ALIGNED(Count,Pow2) \
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( ( ( (Count) & (((Pow2)-1)) ) == 0) ? TRUE : FALSE )
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// BOOL
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// POINTER_IS_ALIGNED(
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// IN LPVOID Ptr,
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// IN DWORD Pow2 // undefined if this isn't a power of 2.
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// );
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//
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#define POINTER_IS_ALIGNED(Ptr,Pow2) \
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( ( ( ((ULONG_PTR)(Ptr)) & (((Pow2)-1)) ) == 0) ? TRUE : FALSE )
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#define ROUND_DOWN_COUNT(Count,Pow2) \
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( (Count) & (~(((LONG)(Pow2))-1)) )
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#define ROUND_DOWN_POINTER(Ptr,Pow2) \
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( (LPVOID) ROUND_DOWN_COUNT( ((ULONG_PTR)(Ptr)), (Pow2) ) )
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// If Count is not already aligned, then
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// round Count up to an even multiple of "Pow2". "Pow2" must be a power of 2.
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//
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// DWORD
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// ROUND_UP_COUNT(
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// IN DWORD Count,
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// IN DWORD Pow2
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// );
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#define ROUND_UP_COUNT(Count,Pow2) \
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( ((Count)+(Pow2)-1) & (~(((LONG)(Pow2))-1)) )
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// LPVOID
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// ROUND_UP_POINTER(
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// IN LPVOID Ptr,
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// IN DWORD Pow2
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// );
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// If Ptr is not already aligned, then round it up until it is.
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#define ROUND_UP_POINTER(Ptr,Pow2) \
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( (LPVOID) ( (((ULONG_PTR)(Ptr))+(Pow2)-1) & (~(((LONG)(Pow2))-1)) ) )
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// Usage: myPtr = ROUND_UP_POINTER( unalignedPtr, ALIGN_LPVOID )
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#define ALIGN_BYTE sizeof(UCHAR)
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#define ALIGN_CHAR sizeof(CHAR)
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#define ALIGN_DESC_CHAR sizeof(DESC_CHAR)
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#define ALIGN_DWORD sizeof(DWORD)
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#define ALIGN_LONG sizeof(LONG)
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#define ALIGN_LPBYTE sizeof(LPBYTE)
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#define ALIGN_LPDWORD sizeof(LPDWORD)
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#define ALIGN_LPSTR sizeof(LPSTR)
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#define ALIGN_LPTSTR sizeof(LPTSTR)
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#define ALIGN_LPVOID sizeof(LPVOID)
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#define ALIGN_LPWORD sizeof(LPWORD)
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#define ALIGN_TCHAR sizeof(TCHAR)
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#define ALIGN_WCHAR sizeof(WCHAR)
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#define ALIGN_WORD sizeof(WORD)
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//
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// For now, use a hardcoded constant. however, this should be visited again
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// and maybe changed to sizeof(QUAD).
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//
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#define ALIGN_QUAD 8
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#if defined(_X86_)
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#define ALIGN_WORST 8
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#elif defined(_MIPS_) || defined(_ALPHA_) || defined(_PPC_)
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//
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// Worst-case alignment on MIPS is 8 bytes (for double). Specify this here,
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// in case our allocator is used for structures containing this. (That is,
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// even though NT/LAN doesn't need this for our data structures, let's be
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// permissive.) The alignment requirements apply to Alpha.
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//
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#define ALIGN_WORST 8
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#elif defined(_IA64_)
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//
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// IA64 note for QUAD: The NT QUAD type definition is NOT the EM 16byte quad type.
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// Because of some NT constraints, QUAD type size cannot be changed.
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//
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#define ALIGN_WORST 16
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#else // none of the above
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#error "Unknown alignment requirements for align.h"
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#endif // none of the above
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#endif // _ALIGN_
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