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149 lines
3.6 KiB
149 lines
3.6 KiB
/*++
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Copyright (c) 1991 Microsoft Corporation
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Module Name:
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vwvdm.h
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Abstract:
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Contains macros, manifests, includes for dealing with VDM
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Author:
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Richard L Firth (rfirth) 25-Oct-1993
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Revision History:
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25-Oct-1993 rfirth
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Created
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--*/
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#ifndef _VWVDM_H_
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#define _VWVDM_H_
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//
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// unaligned pointers - non-Intel platforms must use UNALIGNED to access data
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// in VDM which can (and most likely will) be aligned on odd-byte and word
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// boundaries
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//
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#ifndef ULPBYTE
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#define ULPBYTE BYTE UNALIGNED FAR*
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#endif
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#ifndef ULPWORD
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#define ULPWORD WORD UNALIGNED FAR*
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#endif
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#ifndef ULPDWORD
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#define ULPDWORD DWORD UNALIGNED FAR*
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#endif
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#ifndef ULPVOID
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#define ULPVOID VOID UNALIGNED FAR*
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#endif
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//
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// VDM macros
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//
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//
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// POINTER_FROM_WORDS - returns 32-bit pointer to address in VDM memory described
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// by seg:off. If seg:off = 0:0, returns NULL
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//
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#define POINTER_FROM_WORDS(seg, off, size) \
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_inlinePointerFromWords((WORD)(seg), (WORD)(off), (WORD)(size))
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//
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// _inlinePointerFromWords - the POINTER_FROM_WORDS macro is inefficient if the
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// arguments are calls to eg. getES(), getBX() - the calls are made twice if
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// the pointer turns out to be non-zero. Use an inline function to achieve the
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// same results, but only call function arguments once
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//
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__inline LPVOID _inlinePointerFromWords(WORD seg, WORD off, WORD size) {
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return (seg | off)
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? (LPVOID)GetVDMPointer((ULONG)(MAKELONG(off, seg)), size, (CHAR)((getMSW() & MSW_PE) ? TRUE : FALSE))
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: NULL;
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}
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//
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// GET_POINTER - does the same thing as POINTER_FROM_WORDS, but we know beforehand
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// which processor mode we are in
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//
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#define GET_POINTER(seg, off, size, mode) \
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_inlineGetPointer((WORD)(seg), (WORD)(off), (WORD)(size), (BOOL)(mode))
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__inline LPVOID _inlineGetPointer(WORD seg, WORD off, WORD size, BOOL mode) {
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return (seg | off)
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? (LPVOID)GetVDMPointer(MAKELONG(off, seg), size, (UCHAR)mode)
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: NULL;
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}
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//
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// GET_FAR_POINTER - same as READ_FAR_POINTER with the same proviso as for
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// GET_POINTER
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//
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#define GET_FAR_POINTER(addr, mode) ((LPBYTE)(GET_POINTER(GET_SELECTOR(addr), GET_OFFSET(addr), sizeof(LPBYTE), mode)))
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//
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// GET_SELECTOR - retrieves the selector word from the intel 32-bit far pointer
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// (DWORD) pointed at by <pointer> (remember: stored as offset, segment)
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//
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#define GET_SELECTOR(pointer) READ_WORD((LPWORD)(pointer)+1)
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//
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// GET_SEGMENT - same as GET_SELECTOR
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//
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#define GET_SEGMENT(pointer) GET_SELECTOR(pointer)
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//
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// GET_OFFSET - retrieves the offset word from an intel 32-bit far pointer
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// (DWORD) pointed at by <pointer> (remember: stored as offset, segment)
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//
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#define GET_OFFSET(pointer) READ_WORD((LPWORD)(pointer))
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//
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// READ_FAR_POINTER - read the pair of words in VDM memory, currently pointed at
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// by a 32-bit flat pointer and convert them to a 32-bit flat pointer
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//
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#define READ_FAR_POINTER(addr) ((LPBYTE)(POINTER_FROM_WORDS(GET_SELECTOR(addr), GET_OFFSET(addr), sizeof(LPBYTE))))
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//
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// READ_WORD - read a single 16-bit little-endian word from VDM memory. On non
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// Intel platforms, use unaligned pointer to access data
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//
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#define READ_WORD(addr) (*((ULPWORD)(addr)))
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//
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// READ_DWORD - read a 4-byte little-endian double word from VDM memory. On non
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// Intel platforms, use unaligned pointer to access data
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//
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#define READ_DWORD(addr) (*((ULPDWORD)(addr)))
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//
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// ARRAY_ELEMENTS - gives the number of elements of a particular type in an
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// array
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//
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#define ARRAY_ELEMENTS(a) (sizeof(a)/sizeof((a)[0]))
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//
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// LAST_ELEMENT - returns the index of the last element in array
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//
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#define LAST_ELEMENT(a) (ARRAY_ELEMENTS(a)-1)
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#endif // _VWVDM_H_
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