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tty.h

#ifndef _LINUX_TTY_H
#define _LINUX_TTY_H

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

/*
 * These constants are also useful for user-level apps (e.g., VC
 * resizing).
 */
#define MIN_NR_CONSOLES 1       /* must be at least 1 */
#define MAX_NR_CONSOLES 63    /* serial lines start at 64 */
#define MAX_NR_USER_CONSOLES 16     /* must be root to allocate above this */
            /* Note: the ioctl VT_GETSTATE does not work for
               consoles 16 and higher (since it returns a short) */

#ifdef __KERNEL__
#include <linux/config.h>
#include <linux/fs.h>
#include <linux/major.h>
#include <linux/termios.h>
#include <linux/tqueue.h>
#include <linux/tty_driver.h>
#include <linux/tty_ldisc.h>

#include <asm/system.h>


/*
 * Note: don't mess with NR_PTYS until you understand the tty minor 
 * number allocation game...
 * (Note: the *_driver.minor_start values 1, 64, 128, 192 are
 * hardcoded at present.)
 */
#define NR_PTYS         256   /* ptys/major */
#define NR_LDISCS 16

/*
 * Unix98 PTY's can be defined as any multiple of NR_PTYS up to
 * UNIX98_PTY_MAJOR_COUNT; this section defines what we need from the
 * config options
 */
#ifdef CONFIG_UNIX98_PTYS
# define UNIX98_NR_MAJORS ((CONFIG_UNIX98_PTY_COUNT+NR_PTYS-1)/NR_PTYS)
# if UNIX98_NR_MAJORS <= 0
#  undef CONFIG_UNIX98_PTYS
# elif UNIX98_NR_MAJORS > UNIX98_PTY_MAJOR_COUNT
#  error  Too many Unix98 ptys defined
#  undef  UNIX98_NR_MAJORS
#  define UNIX98_NR_MAJORS UNIX98_PTY_MAJOR_COUNT
# endif
#endif

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

struct screen_info {
      unsigned char  orig_x;              /* 0x00 */
      unsigned char  orig_y;              /* 0x01 */
      unsigned short dontuse1;            /* 0x02 -- EXT_MEM_K sits here */
      unsigned short orig_video_page;           /* 0x04 */
      unsigned char  orig_video_mode;           /* 0x06 */
      unsigned char  orig_video_cols;           /* 0x07 */
      unsigned short unused2;             /* 0x08 */
      unsigned short orig_video_ega_bx;   /* 0x0a */
      unsigned short unused3;             /* 0x0c */
      unsigned char  orig_video_lines;    /* 0x0e */
      unsigned char  orig_video_isVGA;    /* 0x0f */
      unsigned short orig_video_points;   /* 0x10 */

      /* VESA graphic mode -- linear frame buffer */
      unsigned short lfb_width;           /* 0x12 */
      unsigned short lfb_height;          /* 0x14 */
      unsigned short lfb_depth;           /* 0x16 */
      unsigned long  lfb_base;            /* 0x18 */
      unsigned long  lfb_size;            /* 0x1c */
      unsigned short dontuse2, dontuse3;  /* 0x20 -- CL_MAGIC and CL_OFFSET here */
      unsigned short lfb_linelength;            /* 0x24 */
      unsigned char  red_size;            /* 0x26 */
      unsigned char  red_pos;             /* 0x27 */
      unsigned char  green_size;          /* 0x28 */
      unsigned char  green_pos;           /* 0x29 */
      unsigned char  blue_size;           /* 0x2a */
      unsigned char  blue_pos;            /* 0x2b */
      unsigned char  rsvd_size;           /* 0x2c */
      unsigned char  rsvd_pos;            /* 0x2d */
      unsigned short vesapm_seg;          /* 0x2e */
      unsigned short vesapm_off;          /* 0x30 */
      unsigned short pages;               /* 0x32 */
                                    /* 0x34 -- 0x3f reserved for future expansion */
};

extern struct screen_info screen_info;

#define ORIG_X                (screen_info.orig_x)
#define ORIG_Y                (screen_info.orig_y)
#define ORIG_VIDEO_MODE       (screen_info.orig_video_mode)
#define ORIG_VIDEO_COLS       (screen_info.orig_video_cols)
#define ORIG_VIDEO_EGA_BX     (screen_info.orig_video_ega_bx)
#define ORIG_VIDEO_LINES      (screen_info.orig_video_lines)
#define ORIG_VIDEO_ISVGA      (screen_info.orig_video_isVGA)
#define ORIG_VIDEO_POINTS       (screen_info.orig_video_points)

#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 in Color Mode          */
#define VIDEO_TYPE_VGAC       0x22  /* VGA+ in Color Mode         */
#define VIDEO_TYPE_VLFB       0x23  /* VESA VGA in graphic mode   */

#define VIDEO_TYPE_PICA_S3    0x30  /* ACER PICA-61 local S3 video      */
#define VIDEO_TYPE_MIPS_G364  0x31    /* MIPS Magnum 4000 G364 video  */
#define VIDEO_TYPE_SNI_RM     0x32    /* SNI RM200 PCI video          */
#define VIDEO_TYPE_SGI          0x33    /* Various SGI graphics hardware */

#define VIDEO_TYPE_TGAC       0x40  /* DEC TGA */

#define VIDEO_TYPE_SUN          0x50    /* Sun frame buffer. */
#define VIDEO_TYPE_SUNPCI       0x51    /* Sun PCI based frame buffer. */

#define VIDEO_TYPE_PMAC       0x60  /* PowerMacintosh frame buffer. */

/*
 * 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 has no character etc)
 */
#define __DISABLED_CHAR '\0'

/*
 * This is the flip buffer used for the tty driver.  The buffer is
 * located in the tty structure, and is used as a high speed interface
 * between the tty driver and the tty line discipline.
 */
#define TTY_FLIPBUF_SIZE 512

struct tty_flip_buffer {
      struct tq_struct tqueue;
      struct semaphore pty_sem;
      char        *char_buf_ptr;
      unsigned char     *flag_buf_ptr;
      int         count;
      int         buf_num;
      unsigned char     char_buf[2*TTY_FLIPBUF_SIZE];
      char        flag_buf[2*TTY_FLIPBUF_SIZE];
      unsigned char     slop[4]; /* N.B. bug overwrites buffer by 1 */
};
/*
 * The pty uses char_buf and flag_buf as a contiguous buffer
 */
#define PTY_BUF_SIZE    4*TTY_FLIPBUF_SIZE

/*
 * When a break, frame error, or parity error happens, these codes are
 * stuffed into the flags buffer.
 */
#define TTY_NORMAL      0
#define TTY_BREAK 1
#define TTY_FRAME 2
#define TTY_PARITY      3
#define TTY_OVERRUN     4

#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)
#define L_IEXTEN(tty)   _L_FLAG((tty),IEXTEN)

/*
 * Where all of the state associated with a tty is kept while the tty
 * is open.  Since the termios state should be kept even if the tty
 * has been closed --- for things like the baud rate, etc --- it is
 * not stored here, but rather a pointer to the real state is stored
 * here.  Possible the winsize structure should have the same
 * treatment, but (1) the default 80x24 is usually right and (2) it's
 * most often used by a windowing system, which will set the correct
 * size each time the window is created or resized anyway.
 * IMPORTANT: since this structure is dynamically allocated, it must
 * be no larger than 4096 bytes.  Changing TTY_FLIPBUF_SIZE will change
 * the size of this structure, and it needs to be done with care.
 *                                  - TYT, 9/14/92
 */
struct tty_struct {
      int   magic;
      struct tty_driver driver;
      struct tty_ldisc ldisc;
      struct termios *termios, *termios_locked;
      int pgrp;
      int session;
      kdev_t      device;
      unsigned long flags;
      int count;
      struct winsize winsize;
      unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
      unsigned char low_latency:1, warned:1;
      unsigned char ctrl_status;

      struct tty_struct *link;
      struct fasync_struct *fasync;
      struct tty_flip_buffer flip;
      int max_flip_cnt;
      int alt_speed;          /* For magic substitution of 38400 bps */
      wait_queue_head_t write_wait;
      wait_queue_head_t read_wait;
      struct tq_struct tq_hangup;
      void *disc_data;
      void *driver_data;
      struct list_head tty_files;

#define N_TTY_BUF_SIZE 4096
      
      /*
       * The following is data for the N_TTY line discipline.  For
       * historical reasons, this is included in the tty structure.
       */
      unsigned int column;
      unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;
      unsigned char closing:1;
      unsigned short minimum_to_wake;
      unsigned overrun_time;
      int num_overrun;
      unsigned long process_char_map[256/(8*sizeof(unsigned long))];
      char *read_buf;
      int read_head;
      int read_tail;
      int read_cnt;
      unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))];
      int canon_data;
      unsigned long canon_head;
      unsigned int canon_column;
      struct semaphore atomic_read;
      struct semaphore atomic_write;
      spinlock_t read_lock;
      /* If the tty has a pending do_SAK, queue it here - akpm */
        struct tq_struct SAK_tq;
};

/* tty magic number */
#define TTY_MAGIC       0x5401

/*
 * These bits are used in the flags field of the tty structure.
 * 
 * So that interrupts won't be able to mess up the queues,
 * copy_to_cooked must be atomic with respect to itself, as must
 * tty->write.  Thus, you must use the inline functions set_bit() and
 * clear_bit() to make things atomic.
 */
#define TTY_THROTTLED 0
#define TTY_IO_ERROR 1
#define TTY_OTHER_CLOSED 2
#define TTY_EXCLUSIVE 3
#define TTY_DEBUG 4
#define TTY_DO_WRITE_WAKEUP 5
#define TTY_PUSH 6
#define TTY_CLOSING 7
#define TTY_DONT_FLIP 8
#define TTY_HW_COOK_OUT 14
#define TTY_HW_COOK_IN 15
#define TTY_PTY_LOCK 16
#define TTY_NO_WRITE_SPLIT 17

#define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))

extern void tty_write_flush(struct tty_struct *);

extern struct termios tty_std_termios;
extern struct tty_struct * redirect;
extern struct tty_ldisc ldiscs[];

extern void console_init(void);

extern int lp_init(void);
extern int pty_init(void);
extern void tty_init(void);
extern int mxser_init(void);
extern int moxa_init(void);
extern int ip2_init(void);
extern int pcxe_init(void);
extern int pc_init(void);
extern int vcs_init(void);
extern int rp_init(void);
extern int cy_init(void);
extern int stl_init(void);
extern int stli_init(void);
extern int specialix_init(void);
extern int espserial_init(void);
extern int macserial_init(void);
extern int a2232board_init(void);
extern void vt_console_init(void);

extern int tty_paranoia_check(struct tty_struct *tty, kdev_t device,
                        const char *routine);
extern char *tty_name(struct tty_struct *tty, char *buf);
extern void tty_wait_until_sent(struct tty_struct * tty, long timeout);
extern int tty_check_change(struct tty_struct * tty);
extern void stop_tty(struct tty_struct * tty);
extern void start_tty(struct tty_struct * tty);
extern int tty_register_ldisc(int disc, struct tty_ldisc *new_ldisc);
extern int tty_register_driver(struct tty_driver *driver);
extern int tty_unregister_driver(struct tty_driver *driver);
extern struct tty_driver *get_tty_driver(kdev_t device);
extern void tty_register_devfs (struct tty_driver *driver, unsigned int flags,
                        unsigned minor);
extern void tty_unregister_devfs (struct tty_driver *driver, unsigned minor);
extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
                       int buflen);
extern void tty_write_message(struct tty_struct *tty, char *msg);

extern int is_orphaned_pgrp(int pgrp);
extern int is_ignored(int sig);
extern int tty_signal(int sig, struct tty_struct *tty);
extern void tty_hangup(struct tty_struct * tty);
extern void tty_vhangup(struct tty_struct * tty);
extern void tty_unhangup(struct file *filp);
extern int tty_hung_up_p(struct file * filp);
extern void do_SAK(struct tty_struct *tty);
extern void disassociate_ctty(int priv);
extern void tty_flip_buffer_push(struct tty_struct *tty);
extern int tty_get_baud_rate(struct tty_struct *tty);

/* n_tty.c */
extern struct tty_ldisc tty_ldisc_N_TTY;

/* tty_ioctl.c */
extern int n_tty_ioctl(struct tty_struct * tty, struct file * file,
                   unsigned int cmd, unsigned long arg);

/* serial.c */

extern void serial_console_init(void);
 
/* pcxx.c */

extern int pcxe_open(struct tty_struct *tty, struct file *filp);

/* printk.c */

extern void console_print(const char *);

/* vt.c */

extern int vt_ioctl(struct tty_struct *tty, struct file * file,
                unsigned int cmd, unsigned long arg);

#endif /* __KERNEL__ */
#endif

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