#sccs	"@(#)uts/kern/sys:tty.h	1.6"

/*	Convergent Technologies - System V - May 1983	*/

#ifndef tty_h
#define tty_h

#include <sys/types.h>

/*
 * A clist structure is the head of a linked list queue of characters.
 * The routines getc* and putc* manipulate these structures.
 */

struct clist {
	ushort	c_cc;		/* character count */
	struct cblock *c_cf;	/* pointer to first */
	struct cblock *c_cl;	/* pointer to last */
};

/* Macro to find clist structure given pointer into it	*/
#define CMATCH(pointer)		(struct cblock *)(cfree + (pointer - cfree))

/* Character control block for interrupt level control	*/

struct ccblock {
	caddr_t	c_ptr;		/* buffer address	*/
	ushort	c_count;	/* character count	*/
	ushort	c_size;		/* buffer size		*/
};

/*
 * A tty structure is needed for each UNIX character device that
 * is used for normal terminal IO.
 */
#define	NCC	8
struct tty {
	struct	clist t_rawq;	/* raw input queue */
	struct	clist t_canq;	/* canonical queue */
	struct	clist t_outq;	/* output queue */
	struct	ccblock	t_tbuf;	/* tx control block */
	struct	ccblock t_rbuf;	/* rx control block */
	int	(* t_proc)();	/* routine for device functions */
	char	spacer[4];	/* keep space for window pointer */
				/* to reserve alignment for Starlan */
	ushort	t_iflag;	/* input modes */
	ushort	t_oflag;	/* output modes */
	ushort	t_cflag;	/* control modes */
	ushort	t_lflag;	/* line discipline modes */
	short	t_state;	/* internal state */
	short	t_pgrp;		/* process group name */
	char	t_line;		/* line discipline */
	char	t_delct;	/* delimiter count */
	char	t_col;		/* current column */
	unsigned char	t_extctl;/* extended control for serial tty ports.
				   Used for half-duplex and flow control */
	unsigned char	t_mindev;/* minor device number of tty */
	unsigned char	t_cc[NCC];	/* settable control chars */
};

/*
 * The structure of a clist block
 */
#define	CLSIZE	64
struct cblock {
	struct cblock *c_next;
	char	c_first;
	char	c_last;
	char	c_data[CLSIZE];
};

extern struct cblock *cfree;
extern struct cblock * getcb();
extern struct cblock * getcf();
extern struct clist ttnulq;

struct chead {
	struct cblock *c_next;
	short	c_size;
	short	c_count;
	int	c_flag;
};
extern struct chead cfreelist;

struct inter {
	int	cnt;
};

#ifndef space_h
#define	QESC	0200	/* queue escape */
#define	HQEND	01	/* high queue end */

#ifndef TTIPRI
/*	also defined in the priority table in param.h	*/
#define	TTIPRI	27	/* waiting for tty input (was 28) */
#define	TTOPRI	29
#endif

/* limits */
extern int ttlowat[], tthiwat[];
#define	TTXOLO	60
#define	TTXOHI	180
#define	TTECHI	80

/* Hardware bits */
#define	DONE	0200
#define	IENABLE	0100
#define	OVERRUN	040000
#define	FRERROR	020000
#define	PERROR	010000

/* Half duplex bits  */
#define RTSON	001
#define INUSE	002		/* tty port is being used by another
				   driver. */

/* Internal state */
#define	TIMEOUT	01		/* Delay timeout in progress */
#define	WOPEN	02		/* Waiting for open to complete */
#define	ISOPEN	04		/* Device is open */
#define	TBLOCK	010
#define	CARR_ON	020		/* Software copy of carrier-present */
#define	BUSY	040		/* Output in progress */
#define	OASLP	0100		/* Wakeup when output done */
#define	IASLP	0200		/* Wakeup when input done */
#define	TTSTOP	0400		/* Output stopped by ctl-s */
#define	EXTPROC	01000		/* External processing */
#define	TACT	02000
#define	CLESC	04000		/* Last char escape */
#define	RTO	010000		/* Raw Timeout */
#define	TTIOW	020000
#define	TTXON	040000
#define	TTXOFF	0100000

/* for t_cflag */
#define	WINDOW	0040000		/* indicate a bit-mapped console device */

/* l_output status */
#define	CPRES	0100000

/* device commands */
#define	T_OUTPUT	0
#define	T_TIME		1
#define	T_SUSPEND	2
#define	T_RESUME	3
#define	T_BLOCK		4
#define	T_UNBLOCK	5
#define	T_RFLUSH	6
#define	T_WFLUSH	7
#define	T_BREAK		8
#define	T_INPUT		9
#define T_VBREAK	10

#endif space_h
#endif tty_h