typedef struct cdrom_subchnl_t
{
	/* input parameters */

	unsigned char	format;	/* CDROM_MSF (0x01) or CDROM_LBA (0x02) */

	/* output parameters */

	unsigned char	audiostatus;	/* FIXME: unknown value */
	unsigned int	reserved:8;	/* reserved */
	unsigned int	adr:4;		/* see cdrom_tocentry_t */
	unsigned int	ctrl:4;		/* see cdrom_tocentry_t */
	unsigned char	trk;		/* current track */
	unsigned char	ind;		/* current index */
	cdrom_addr_u	absaddr;	/* absolute address */
	cdrom_addr_u	reladdr;	/* track relative address */
};

#define	CDROM_LBA	0x01
#define	CDROM_MSF	0x02