pktio.h

/********************************************************
*							*
*		CP/M-68K header file 			*
*    Copyright (c) 1982 by Digital Research, Inc.	*
*    Structure definitions for doing I/O in packets	*
*							*
********************************************************/

/* May use this information structure instead of disk parameter header and
   disk parameter block in future, but for now it's unused
struct dskinfo
{
	UBYTE	*dbuffp;
	UBYTE	*csv;
	UBYTE	*alv;
	UBYTE	blksize;
	UBYTE	didummy;
	UWORD	dskmax;
	UWORD	dirmax;
	UWORD	chksize;
};
			*/

struct iopb
{
	UBYTE	iofcn;		/*  function number, see defines below	*/
	UBYTE	ioflags;	/*  used for login flag and write flag	*/
	UBYTE	devtype;	/*  device type, see defines below 	*/
				/*  currently unused			*/
	UBYTE	devnum;		/*  device number, or, devtype and devnum
				    taken together form int device number */
	LONG	devadr;		/*  item nmbr on device to start xfer at */
		/* note -- item is sector for disks, byte for char devs */
	UWORD	xferlen;	/*  number items to transfer		*/
	UBYTE	*xferadr;	/*  memory address to xfer to/from	*/
	struct dph *infop;	/*  pointer to disk parameter header	*/
				/*  return parm for fcn 0, input for rest */
};


/*  Definitions for iofcn, the function number */
#define	sel_info 0		/*  select and return info on device */
#define	read	 1
#define	write    2
#define	flush    3
#define	status   4		/* not currently used */


/*  Definitions for devtype, the device type */
/*  This field not currently used	*/
#define	console	 0
#define	printer	 1
#define	disk     2
#define	memory   3		/* gets TPA boundaries */
#define	redir    4		/* read/write IOByte   */
#define	exc_vec	 5		/* set exception vector */