memory.h

PC燒錄BIOS的源程序

#ifndef __MEMORY_H__

#define __MEMORY_H__

#include "const.h"

////////Global function declaration BEGIN///////////////////
//The Following function is implemented in FlatMem.asm.
extern  unsigned int SavedGDT[8];

//return 1 when operation ok, return 0 when Failed
extern "C" int FlatRealOn();
//extern "C" int FlatRealOn( unsigned int* pSavedGDT , unsigned int GDTSize);

extern "C" void FlatRealOff();

//return 1 when A20 isnot on , return 0 when A20 is on
extern "C" BYTE A20IsNotOn();

////////Global function declaration END///////////////////

typedef struct _tagXMSINFO
{
	LONGINT XMMHandler;		//XMS Handler Location
	
	LONGINT XMSBlockPos;		//XMS Block Position in Memory
	LONGINT XMSBlockLeft;			//XMS Block Left Location
	unsigned int  XMSBlockHnd;		//XMS Block handle for Memory allocation
	unsigned int  XMSBlockSize;		//XMS Block Size


} XMSINFO, *PXMSINFO;


BOOL InitializeXMSMemory(PXMSINFO pXMSInfo);
BOOL CloseXMSMemory(PXMSINFO pXMSInfo);

BOOL InitializeMem(PXMSINFO pXMSInfo);
BOOL AllocateHiMem(PXMSINFO pXMSInfo);


#endif  //__MEMORY_H__