Category : C++ Source Code
Archive   : VMVCPP.ZIP
Filename : EMS.H

/***
*ems.h -
*
* Copyright (c) 1989-1992, Microsoft Corporation. All rights reserved.
*
*******************************************************************************/

typedef unsigned HEMS;
typedef HEMS _far *PHEMS;

#pragma pack(1)

typedef struct handle_page_struct {
HEMS hems;
unsigned cPage;
} handle_page;

typedef struct log_phys_map_struct {
unsigned iPageLogical;
union {
unsigned iPagePhysical;
_segment segPage;
};
} log_phys_map;

typedef struct map_and_jump_struct {
void _far *pTarget;
unsigned char cPage;
log_phys_map _far *pMap;
} map_and_jump;

typedef struct map_and_call_struct {
void _far *pTarget;
unsigned char cPageNew;
log_phys_map _far *pMapNew;
unsigned char cPageOld;
log_phys_map _far *pMapOld;
unsigned reserved[4];
} map_and_call;

typedef struct move_source_dest_struct {
unsigned long cb;
unsigned char fEmsSource;
HEMS hemsSource;
unsigned ibSource;
union {
unsigned iPageSource;
_segment segSource;
};
unsigned char fEmsDest;
HEMS hemsDest;
unsigned ibDest;
union {
unsigned iPageDest;
_segment segDest;
};
} move_source_dest;

#pragma pack()

int PUBLIC _far __FEmsCheckInstalled(void);

ERR PUBLIC _far __ErrEmsGetStatus(void);
ERR PUBLIC _far __ErrEmsGetPageFrameAddress(_segment _far *pseg);
ERR PUBLIC _far __ErrEmsGetUnallocatedPageCount(unsigned _far *pcPage, unsigned _far *pcPageTotal);
ERR PUBLIC _far __ErrEmsAllocatePages(PHEMS phems, unsigned cPage);
ERR PUBLIC _far __ErrEmsMapHandlePage(HEMS hems, unsigned char iPagePhysical, unsigned iPageLogical);
ERR PUBLIC _far __ErrEmsDeallocatePages(HEMS hems);
ERR PUBLIC _far __ErrEmsGetVersion(unsigned char _far *pbVersion);
ERR PUBLIC _far __ErrEmsSavePageMap(HEMS hems);
ERR PUBLIC _far __ErrEmsRestorePageMap(HEMS hems);
ERR PUBLIC _far __ErrEmsGetHandleCount(unsigned _far *pcOpenHandles);
ERR PUBLIC _far __ErrEmsGetHandlePages(HEMS hems, unsigned _far *pcPage);
ERR PUBLIC _far __ErrEmsGetAllHandlePages(handle_page (*pHandlePage)[], unsigned _far *pcOpenHandles);
ERR PUBLIC _far __ErrEmsGetPageMap(void _far *pPageMap);
ERR PUBLIC _far __ErrEmsSetPageMap(void _far *pPageMap);
ERR PUBLIC _far __ErrEmsGetSetPageMap(void _far *pPageMapIn, void _far *pPageMapOut);
ERR PUBLIC _far __ErrEmsGetSizeOfPageMap(unsigned char _far *pcbPageMap);
ERR PUBLIC _far __ErrEmsGetPartialPageMap(log_phys_map _far *pMap, void _far *pPageMap);
ERR PUBLIC _far __ErrEmsSetPartialPageMap(void _far *pPageMap);
ERR PUBLIC _far __ErrEmsGetSizeOfPartialPageMap(unsigned cPage, unsigned char _far *pcbPageMap);
ERR PUBLIC _far __ErrEmsMapMultipleHandlePages(HEMS hems, unsigned cPage, log_phys_map _far *pMap, int fSegment);
ERR PUBLIC _far __ErrEmsReallocatePages(HEMS hems, unsigned cPage);
ERR PUBLIC _far __ErrEmsGetHandleAttribute(HEMS hems, unsigned char _far *pbAttribute);
ERR PUBLIC _far __ErrEmsSetHandleAttribute(HEMS hems, char bAttribute);
ERR PUBLIC _far __ErrEmsGetAttributeCapability(unsigned char _far *pbCapability);
ERR PUBLIC _far __ErrEmsGetHandleName(HEMS hems, char (*pName)[8]);
ERR PUBLIC _far __ErrEmsSetHandleName(HEMS hems, char (*pName)[8]);
ERR PUBLIC _far __ErrEmsGetHandleDirectory(void _far * /* UNDONE */ pDirectory, unsigned char _far *pcEntries);
ERR PUBLIC _far __ErrEmsSearchForNamedHandle(PHEMS phems, char (*pName)[8]);
ERR PUBLIC _far __ErrEmsGetTotalHandles(unsigned _far *pcHandles);
ERR PUBLIC _far __ErrEmsAlterPageMapAndJump(HEMS hems, int fPhysical, map_and_jump _far *p);
ERR PUBLIC _far __ErrEmsAlterPageMapAndCall(HEMS hems, int fPhysical, map_and_call _far *p);
ERR PUBLIC _far __ErrEmsGetPageMapStackSpaceSize(unsigned _far *pcbStack);
ERR PUBLIC _far __ErrEmsMoveMemoryRegion(move_source_dest _far *p);
ERR PUBLIC _far __ErrEmsExchangeMemoryRegion(move_source_dest _far *p);


#define cEmsPagesLim 2048U

#define errEmsBase 0x3000