#ifndef _LINUX_TTY_H
#define _LINUX_TTY_H

/*
 * 'tty.h' defines some structures used by tty_io.c and some defines.
 */

#include <linux/termios.h>

#include <asm/system.h>

#define NR_CONSOLES	8
#define NR_LDISCS	16

/*
 * These are set up by the setup-routine at boot-time:
 */

struct screen_info {
	unsigned char  orig_x;
	unsigned char  orig_y;
	unsigned char  unused1[2];
	unsigned short orig_video_page;
	unsigned char  orig_video_mode;
	unsigned char  orig_video_cols;
	unsigned short orig_video_ega_ax;
	unsigned short orig_video_ega_bx;
	unsigned short orig_video_ega_cx;
	unsigned char  orig_video_lines;
};

extern struct screen_info screen_info;

#define ORIG_X			(screen_info.orig_x)
#define ORIG_Y			(screen_info.orig_y)
#define ORIG_VIDEO_PAGE		(screen_info.orig_video_page)
#define ORIG_VIDEO_MODE		(screen_info.orig_video_mode)
#define ORIG_VIDEO_COLS 	(screen_info.orig_video_cols)
#define ORIG_VIDEO_EGA_AX	(screen_info.orig_video_ega_ax)
#define ORIG_VIDEO_EGA_BX	(screen_info.orig_video_ega_bx)
#define ORIG_VIDEO_EGA_CX	(screen_info.orig_video_ega_cx)
#define ORIG_VIDEO_LINES	(screen_info.orig_video_lines)

#define VIDEO_TYPE_MDA		0x10	/* Monochrome Text Display	*/
#define VIDEO_TYPE_CGA		0x11	/* CGA Display 			*/
#define VIDEO_TYPE_EGAM		0x20	/* EGA/VGA in Monochrome Mode	*/
#define VIDEO_TYPE_EGAC		0x21	/* EGA/VGA in Color Mode	*/

/*
 * This character is the same as _POSIX_VDISABLE: it cannot be used as
 * a c_cc[] character, but indicates that a particular special character
 * isn't in use (eg VINTR ahs no character etc)
 */
#define __DISABLED_CHAR '\0'

/*
 * See comment for the tty_struct structure before changing
 * TTY_BUF_SIZE.  Actually, there should be different sized tty_queue
 * structures for different purposes.  1024 bytes for the transmit
 * queue is way overkill.  TYT, 9/14/92
 */
#define TTY_BUF_SIZE 1024	/* Must be a power of 2 */

struct tty_queue {
	unsigned long head;
	unsigned long tail;
	struct wait_queue * proc_list;
	unsigned char buf[TTY_BUF_SIZE];
};

struct serial_struct {
	int	type;
	int	line;
	int	port;
	int	irq;
	int	flags;
	int	xmit_fifo_size;
	int	custom_divisor;
	int	baud_base;
	unsigned short	close_delay;
	char	reserved_char[2];
	int	hub6;
	int	reserved[5];
};

/*
 * These are the supported serial types.
 */
#define PORT_UNKNOWN	0
#define PORT_8250	1
#define PORT_16450	2
#define PORT_16550	3
#define PORT_16550A	4
#define PORT_MAX	4

/*
 * Definitions for async_struct (and serial_struct) flags field
 */
#define ASYNC_HUP_NOTIFY 0x0001 /* Notify getty on hangups and closes 
				   on the callout port */
#define ASYNC_FOURPORT  0x0002	/* Set OU1, OUT2 per AST Fourport settings */
#define ASYNC_SAK	0x0004	/* Secure Attention Key (Orange book) */
#define ASYNC_SPLIT_TERMIOS 0x0008 /* Separate termios for dialin/callout */

#define ASYNC_SPD_MASK	0x0030
#define ASYNC_SPD_HI	0x0010	/* Use 56000 instead of 38400 bps */
#define ASYNC_SPD_VHI	0x0020  /* Use 115200 instead of 38400 bps */
#define ASYNC_SPD_CUST	0x0030  /* Use user-specified divisor */

#define ASYNC_SKIP_TEST	0x0040 /* Skip UART test during autoconfiguration */
#define ASYNC_AUTO_IRQ  0x0080 /* Do automatic IRQ during autoconfiguration */
#define ASYNC_SESSION_LOCKOUT 0x0100 /* Lock out cua opens based on session */
#define ASYNC_PGRP_LOCKOUT    0x0200 /* Lock out cua opens based on pgrp */
#define ASYNC_CALLOUT_NOHUP   0x0400 /* Don't do hangups for cua device */

#define ASYNC_FLAGS	0x0FFF	/* Possible legal async flags */
#define ASYNC_USR_MASK 0x0430	/* Legal flags that non-privileged
				 * users can set or reset */

/* Internal flags used only by kernel/chr_drv/serial.c */
#define ASYNC_INITIALIZED	0x80000000 /* Serial port was initialized */
#define ASYNC_CALLOUT_ACTIVE	0x40000000 /* Call out device is active */
#define ASYNC_NORMAL_ACTIVE	0x20000000 /* Normal device is active */
#define ASYNC_BOOT_AUTOCONF	0x10000000 /* Autoconfigure port on bootup */
#define ASYNC_CLOSING		0x08000000 /* Serial port is closing */

#define IS_A_CONSOLE(min)	(((min) & 0xC0) == 0x00)
#define IS_A_SERIAL(min)	(((min) & 0xC0) == 0x40)
#define IS_A_PTY(min)		((min) & 0x80)
#define IS_A_PTY_MASTER(min)	(((min) & 0xC0) == 0x80)
#define IS_A_PTY_SLAVE(min)	(((min) & 0xC0) == 0xC0)
#define PTY_OTHER(min)		((min) ^ 0x40)

#define SL_TO_DEV(line)		((line) | 0x40)
#define DEV_TO_SL(min)		((min) & 0x3F)

#define INC(a) ((a) = ((a)+1) & (TTY_BUF_SIZE-1))
#define DEC(a) ((a) = ((a)-1) & (TTY_BUF_SIZE-1))
#define EMPTY(a) ((a)->head == (a)->tail)
#define LEFT(a) (((a)->tail-(a)->head-1)&(TTY_BUF_SIZE-1))
#define LAST(a) ((a)->buf[(TTY_BUF_SIZE-1)&((a)->head-1)])
#define FULL(a) (!LEFT(a))
#define CHARS(a) (((a)->head-(a)->tail)&(TTY_BUF_SIZE-1))

extern void put_tty_queue(unsigned char c, struct tty_queue * queue);
extern int get_tty_queue(struct tty_queue * queue);

#define INTR_CHAR(tty) ((tty)->termios->c_cc[VINTR])
#define QUIT_CHAR(tty) ((tty)->termios->c_cc[VQUIT])
#define ERASE_CHAR(tty) ((tty)->termios->c_cc[VERASE])
#define KILL_CHAR(tty) ((tty)->termios->c_cc[VKILL])
#define EOF_CHAR(tty) ((tty)->termios->c_cc[VEOF])
#define TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME])
#define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN])
#define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC])
#define START_CHAR(tty) ((tty)->termios->c_cc[VSTART])
#define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP])
#define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP])
#define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL])
#define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT])
#define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD])
#define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE])
#define LNEXT_CHAR(tty)	((tty)->termios->c_cc[VLNEXT])
#define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2])

#define _I_FLAG(tty,f)	((tty)->termios->c_iflag & (f))
#define _O_FLAG(tty,f)	((tty)->termios->c_oflag & (f))
#define _C_FLAG(tty,f)	((tty)->termios->c_cflag & (f))
#define _L_FLAG(tty,f)	((tty)->termios->c_lflag & (f))

#define I_IGNBRK(tty)	_I_FLAG((tty),IGNBRK)
#define I_BRKINT(tty)	_I_FLAG((tty),BRKINT)
#define I_IGNPAR(tty)	_I_FLAG((tty),IGNPAR)
#define I_PARMRK(tty)	_I_FLAG((tty),PARMRK)
#define I_INPCK(tty)	_I_FLAG((tty),INPCK)
#define I_ISTRIP(tty)	_I_FLAG((tty),ISTRIP)
#define I_INLCR(tty)	_I_FLAG((tty),INLCR)
#define I_IGNCR(tty)	_I_FLAG((tty),IGNCR)
#define I_ICRNL(tty)	_I_FLAG((tty),ICRNL)
#define I_IUCLC(tty)	_I_FLAG((tty),IUCLC)
#define I_IXON(tty)	_I_FLAG((tty),IXON)
#define I_IXANY(tty)	_I_FLAG((tty),IXANY)
#define I_IXOFF(tty)	_I_FLAG((tty),IXOFF)
#define I_IMAXBEL(tty)	_I_FLAG((tty),IMAXBEL)

#define O_OPOST(tty)	_O_FLAG((tty),OPOST)
#define O_OLCUC(tty)	_O_FLAG((tty),OLCUC)
#define O_ONLCR(tty)	_O_FLAG((tty),ONLCR)
#define O_OCRNL(tty)	_O_FLAG((tty),OCRNL)
#define O_ONOCR(tty)	_O_FLAG((tty),ONOCR)
#define O_ONLRET(tty)	_O_FLAG((tty),ONLRET)
#define O_OFILL(tty)	_O_FLAG((tty),OFILL)
#define O_OFDEL(tty)	_O_FLAG((tty),OFDEL)
#define O_NLDLY(tty)	_O_FLAG((tty),NLDLY)
#define O_CRDLY(tty)	_O_FLAG((tty),CRDLY)
#define O_TABDLY(tty)	_O_FLAG((tty),TABDLY)
#define O_BSDLY(tty)	_O_FLAG((tty),BSDLY)
#define O_VTDLY(tty)	_O_FLAG((tty),VTDLY)
#define O_FFDLY(tty)	_O_FLAG((tty),FFDLY)

#define C_BAUD(tty)	_C_FLAG((tty),CBAUD)
#define C_CSIZE(tty)	_C_FLAG((tty),CSIZE)
#define C_CSTOPB(tty)	_C_FLAG((tty),CSTOPB)
#define C_CREAD(tty)	_C_FLAG((tty),CREAD)
#define C_PARENB(tty)	_C_FLAG((tty),PARENB)
#define C_PARODD(tty)	_C_FLAG((tty),PARODD)
#define C_HUPCL(tty)	_C_FLAG((tty),HUPCL)
#define C_CLOCAL(tty)	_C_FLAG((tty),CLOCAL)
#define C_CIBAUD(tty)	_C_FLAG((tty),CIBAUD)
#define C_CRTSCTS(tty)	_C_FLAG((tty),CRTSCTS)

#define L_ISIG(tty)	_L_FLAG((tty),ISIG)
#define L_ICANON(tty)	_L_FLAG((tty),ICANON)
#define L_XCASE(tty)	_L_FLAG((tty),XCASE)
#define L_ECHO(tty)	_L_FLAG((tty),ECHO)
#define L_ECHOE(tty)	_L_FLAG((tty),ECHOE)
#define L_ECHOK(tty)	_L_FLAG((tty),ECHOK)
#define L_ECHONL(tty)	_L_FLAG((tty),ECHONL)
#define L_NOFLSH(tty)	_L_FLAG((tty),NOFLSH)
#define L_TOSTOP(tty)	_L_FLAG((tty),TOSTOP)
#define L_ECHOCTL(tty)	_L_FLAG((tty),ECHOCTL)
#define L_ECHOPRT(tty)	_L_FLAG((tty),ECHOPRT)
#define L_ECHOKE(tty)	_L_FLAG((tty),ECHOKE)
#define L_FLUSHO(tty)	_L_FLAG((tty),FLUSHO)
#define L_PENDIN(tty)	_L_FLAG((tty),PENDIN)