/*
	virtual memory maneger routine header
		T.Tsuda. , DSA	April 14,1995
*/


	/* constants */

#define	VMMEMSIZE	0x4000
#define	VMADDMASK	0xffffc000l

#ifdef	MEMORY
#define	VMTBLSIZE	0x840
#define	VMCMBSIZE	0x40

	/* vmtable type */
#define	VMCONV	0
#define	VMEMS	1

	/* vmtable use */
#define	VMFREE	0
#define	VMBLANK	1
#define	VMINUSE	2

	/* virtual memory table */
struct	_vmtbl {
	unsigned long	address;	/* logical memoty block base address */
	unsigned	type	: 2;	/* physical memory type (conventional / EMS) */
	unsigned	use 	: 2;	/* flag (free / inuse) */
	unsigned	page	:12;	/* EMS logical page number */
};
#define	VMTABLE	struct _vmtbl

struct	{
	int	vmready;
	int	emsready;

	unsigned char	far *emsadd;	/* far pointer of ems physical page */
	unsigned long	addbase;	/* memory block logical address base */

	unsigned long	address;	/* current logical address */
	long	step;				/* logical address step */

	unsigned int	freeent;	/* vmtable 1st free entry */
} vmm;

	/* externals */
VMTABLE	*vmtable;			/* virtual memory table */
int	vmtblnum;				/* vmtable number */
unsigned int	vmentry;	/* vmtable entry */
	/* conventional memory block (16K byte) */
	/*	'vmtable[number].address' mapping to 'vmcmtbl[number]'	*/
unsigned char	far *vmcmtbl[VMCMBSIZE];

	/* macros */
#define	vmismap(add)	((vmtable[vmentry].use == VMINUSE) && (vmm.addbase == ((unsigned long)(add) & VMADDMASK)))
#define	setvmptr(ptr)	((ptr) = (vmtable[vmentry].type == VMEMS ? vmm.emsadd : vmcmtbl[vmentry]) + (vmm.address & ~VMADDMASK))

#endif


/*	function of prottypes	*/

int	vmsearch(unsigned long address);
/*
description:
	mapping physical memory to primary virtual memory (for read)
	if no entry not allocation memory
*/

int	vmmap(unsigned long address);
/*
description:
	mapping physical memory to primary virtual memory (for write)
	if no entry allocation memory
*/

unsigned char	far *vmmap1(unsigned long address);
/*
description:
	mapping physical memory to secondary virtual memory (for read)
	if no entry not allocation memory
*/

int	vmgarbag(void);
/*
description:
	garbage collection (free memory block that all data is 0xff)
*/


/*	user function of prottypes	*/

int	vminit(void);
/*
description:
	initialize virtual memory
*/

int	vmflush(void);
/*
description:
	free virtual memory
*/

void	vmaddr(unsigned long address);
/*
description:
	specified the current logical address
*/

void	vmstep(long step);
/*
description:
	specified the increase of logical address
*/

unsigned char	vmread(void);
/*
description:
	reads the current logical address of the virtual memory
	and add step to current address
*/

int	vmwrite(unsigned char data);
/*
description:
	writes the data to the current logical address of the virtual memory
	and add step to current address
*/

int	vmreadb(unsigned char *buf,unsigned int size);
/*
description:
	reads the bytes from the virtual memory location of logical address
*/

int	vmwriteb(unsigned char *buf,unsigned int size);
/*
description:
	writes the bytes to the virtual memory location of logical address
*/

int	vmmove(unsigned long sorce,unsigned long distin,unsigned long size);
/*
description:
	copys third argument bytes from the virtual memory location pointed to by
	first argument to the virtual memory location pointed to by second argument
*/

int	vmfill(unsigned long address,unsigned char data,unsigned long size);
/*
description:
	fills third argument bytes second argument to the virtual memory location
	pointed to by first argument
*/

int	vmerase(void);
/*
description:
	erase all location of virtual mamory
*/

unsigned long	vmfirst(unsigned long start,unsigned long end);
/*
description
	search first used(not 0xff) address from start to end
*/

unsigned long	vmlast(unsigned long start,unsigned long end);
/*
description
	search last used(not 0xff) address from start to end
*/