include/linux/tty.h

   1 #ifndef _LINUX_TTY_H
   2 #define _LINUX_TTY_H
   3
   4 /*
   5  * 'tty.h' defines some structures used by tty_io.c and some defines.
   6  */
   7
   8 /*
   9  * These constants are also useful for user-level apps (e.g., VC
  10  * resizing).
  11  */
  12 #define MIN_NR_CONSOLES 1       /* must be at least 1 */
  13 #define MAX_NR_CONSOLES 63      /* serial lines start at 64 */
  14 #define MAX_NR_USER_CONSOLES 63 /* must be root to allocate above this */
  15                 /* Note: the ioctl VT_GETSTATE does not work for
  16                    consoles 16 and higher (since it returns a short) */
  17
  18 #ifdef __KERNEL__
  19 #include <linux/config.h>
  20 #include <linux/fs.h>
  21 #include <linux/major.h>
  22 #include <linux/termios.h>
  23 #include <linux/tqueue.h>
  24 #include <linux/tty_driver.h>
  25 #include <linux/tty_ldisc.h>
  26
  27 #include <asm/system.h>
  28
  29
  30 /*
  31  * Note: don't mess with NR_PTYS until you understand the tty minor
  32  * number allocation game...
  33  * (Note: the *_driver.minor_start values 1, 64, 128, 192 are
  34  * hardcoded at present.)
  35  */
  36 #define NR_PTYS         256     /* ptys/major */
  37 #define NR_LDISCS       16
  38
  39 /*
  40  * Unix98 PTY's can be defined as any multiple of NR_PTYS up to
  41  * UNIX98_PTY_MAJOR_COUNT; this section defines what we need from the
  42  * config options
  43  */
  44 #ifdef CONFIG_UNIX98_PTYS
  45 # define UNIX98_NR_MAJORS ((CONFIG_UNIX98_PTY_COUNT+NR_PTYS-1)/NR_PTYS)
  46 # if UNIX98_NR_MAJORS <= 0
  47 #  undef CONFIG_UNIX98_PTYS
  48 # elif UNIX98_NR_MAJORS > UNIX98_PTY_MAJOR_COUNT
  49 #  error  Too many Unix98 ptys defined
  50 #  undef  UNIX98_NR_MAJORS
  51 #  define UNIX98_NR_MAJORS UNIX98_PTY_MAJOR_COUNT
  52 # endif
  53 #endif
  54
  55 /*
  56  * These are set up by the setup-routine at boot-time:
  57  */
  58
  59 struct screen_info {
  60         unsigned char  orig_x;                  /* 0x00 */
  61         unsigned char  orig_y;                  /* 0x01 */
  62         unsigned short dontuse1;                /* 0x02 -- EXT_MEM_K sits here */
  63         unsigned short orig_video_page;         /* 0x04 */
  64         unsigned char  orig_video_mode;         /* 0x06 */
  65         unsigned char  orig_video_cols;         /* 0x07 */
  66         unsigned short unused2;                 /* 0x08 */
  67         unsigned short orig_video_ega_bx;       /* 0x0a */
  68         unsigned short unused3;                 /* 0x0c */
  69         unsigned char  orig_video_lines;        /* 0x0e */
  70         unsigned char  orig_video_isVGA;        /* 0x0f */
  71         unsigned short orig_video_points;       /* 0x10 */
  72
  73         /* VESA graphic mode -- linear frame buffer */
  74         unsigned short lfb_width;               /* 0x12 */
  75         unsigned short lfb_height;              /* 0x14 */
  76         unsigned short lfb_depth;               /* 0x16 */
  77         unsigned long  lfb_base;                /* 0x18 */
  78         unsigned long  lfb_size;                /* 0x1c */
  79         unsigned short dontuse2, dontuse3;      /* 0x20 -- CL_MAGIC and CL_OFFSET here */
  80         unsigned short lfb_linelength;          /* 0x24 */
  81         unsigned char  red_size;                /* 0x26 */
  82         unsigned char  red_pos;                 /* 0x27 */
  83         unsigned char  green_size;              /* 0x28 */
  84         unsigned char  green_pos;               /* 0x29 */
  85         unsigned char  blue_size;               /* 0x2a */
  86         unsigned char  blue_pos;                /* 0x2b */
  87         unsigned char  rsvd_size;               /* 0x2c */
  88         unsigned char  rsvd_pos;                /* 0x2d */
  89         unsigned short vesapm_seg;              /* 0x2e */
  90         unsigned short vesapm_off;              /* 0x30 */
  91         unsigned short pages;                   /* 0x32 */
  92                                                 /* 0x34 -- 0x3f reserved for future expansion */
  93 };
  94
  95 extern struct screen_info screen_info;
  96
  97 #define ORIG_X                  (screen_info.orig_x)
  98 #define ORIG_Y                  (screen_info.orig_y)
  99 #define ORIG_VIDEO_MODE         (screen_info.orig_video_mode)
 100 #define ORIG_VIDEO_COLS         (screen_info.orig_video_cols)
 101 #define ORIG_VIDEO_EGA_BX       (screen_info.orig_video_ega_bx)
 102 #define ORIG_VIDEO_LINES        (screen_info.orig_video_lines)
 103 #define ORIG_VIDEO_ISVGA        (screen_info.orig_video_isVGA)
 104 #define ORIG_VIDEO_POINTS       (screen_info.orig_video_points)
 105
 106 #define VIDEO_TYPE_MDA          0x10    /* Monochrome Text Display      */
 107 #define VIDEO_TYPE_CGA          0x11    /* CGA Display                  */
 108 #define VIDEO_TYPE_EGAM         0x20    /* EGA/VGA in Monochrome Mode   */
 109 #define VIDEO_TYPE_EGAC         0x21    /* EGA in Color Mode            */
 110 #define VIDEO_TYPE_VGAC         0x22    /* VGA+ in Color Mode           */
 111 #define VIDEO_TYPE_VLFB         0x23    /* VESA VGA in graphic mode     */
 112
 113 #define VIDEO_TYPE_TGAC         0x40    /* DEC TGA */
 114
 115 #define VIDEO_TYPE_SUN          0x50    /* Sun frame buffer. */
 116 #define VIDEO_TYPE_SUNPCI       0x51    /* Sun PCI based frame buffer. */
 117
 118 #define VIDEO_TYPE_PMAC         0x60    /* PowerMacintosh frame buffer. */
 119
 120 /*
 121  * This character is the same as _POSIX_VDISABLE: it cannot be used as
 122  * a c_cc[] character, but indicates that a particular special character
 123  * isn't in use (eg VINTR has no character etc)
 124  */
 125 #define __DISABLED_CHAR '\0'
 126
 127 /*
 128  * This is the flip buffer used for the tty driver.  The buffer is
 129  * located in the tty structure, and is used as a high speed interface
 130  * between the tty driver and the tty line discipline.
 131  */
 132 #define TTY_FLIPBUF_SIZE 512
 133
 134 struct tty_flip_buffer {
 135         struct tq_struct tqueue;
 136         struct semaphore pty_sem;
 137         char            *char_buf_ptr;
 138         unsigned char   *flag_buf_ptr;
 139         int             count;
 140         int             buf_num;
 141         unsigned char   char_buf[2*TTY_FLIPBUF_SIZE];
 142         char            flag_buf[2*TTY_FLIPBUF_SIZE];
 143         unsigned char   slop[4]; /* N.B. bug overwrites buffer by 1 */
 144 };
 145 /*
 146  * The pty uses char_buf and flag_buf as a contiguous buffer
 147  */
 148 #define PTY_BUF_SIZE    4*TTY_FLIPBUF_SIZE
 149
 150 /*
 151  * When a break, frame error, or parity error happens, these codes are
 152  * stuffed into the flags buffer.
 153  */
 154 #define TTY_NORMAL      0
 155 #define TTY_BREAK       1
 156 #define TTY_FRAME       2
 157 #define TTY_PARITY      3
 158 #define TTY_OVERRUN     4
 159
 160 #define INTR_CHAR(tty) ((tty)->termios->c_cc[VINTR])
 161 #define QUIT_CHAR(tty) ((tty)->termios->c_cc[VQUIT])
 162 #define ERASE_CHAR(tty) ((tty)->termios->c_cc[VERASE])
 163 #define KILL_CHAR(tty) ((tty)->termios->c_cc[VKILL])
 164 #define EOF_CHAR(tty) ((tty)->termios->c_cc[VEOF])
 165 #define TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME])
 166 #define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN])
 167 #define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC])
 168 #define START_CHAR(tty) ((tty)->termios->c_cc[VSTART])
 169 #define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP])
 170 #define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP])
 171 #define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL])
 172 #define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT])
 173 #define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD])
 174 #define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE])
 175 #define LNEXT_CHAR(tty) ((tty)->termios->c_cc[VLNEXT])
 176 #define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2])
 177
 178 #define _I_FLAG(tty,f)  ((tty)->termios->c_iflag & (f))
 179 #define _O_FLAG(tty,f)  ((tty)->termios->c_oflag & (f))
 180 #define _C_FLAG(tty,f)  ((tty)->termios->c_cflag & (f))
 181 #define _L_FLAG(tty,f)  ((tty)->termios->c_lflag & (f))
 182
 183 #define I_IGNBRK(tty)   _I_FLAG((tty),IGNBRK)
 184 #define I_BRKINT(tty)   _I_FLAG((tty),BRKINT)
 185 #define I_IGNPAR(tty)   _I_FLAG((tty),IGNPAR)
 186 #define I_PARMRK(tty)   _I_FLAG((tty),PARMRK)
 187 #define I_INPCK(tty)    _I_FLAG((tty),INPCK)
 188 #define I_ISTRIP(tty)   _I_FLAG((tty),ISTRIP)
 189 #define I_INLCR(tty)    _I_FLAG((tty),INLCR)
 190 #define I_IGNCR(tty)    _I_FLAG((tty),IGNCR)
 191 #define I_ICRNL(tty)    _I_FLAG((tty),ICRNL)
 192 #define I_IUCLC(tty)    _I_FLAG((tty),IUCLC)
 193 #define I_IXON(tty)     _I_FLAG((tty),IXON)
 194 #define I_IXANY(tty)    _I_FLAG((tty),IXANY)
 195 #define I_IXOFF(tty)    _I_FLAG((tty),IXOFF)
 196 #define I_IMAXBEL(tty)  _I_FLAG((tty),IMAXBEL)
 197
 198 #define O_OPOST(tty)    _O_FLAG((tty),OPOST)
 199 #define O_OLCUC(tty)    _O_FLAG((tty),OLCUC)
 200 #define O_ONLCR(tty)    _O_FLAG((tty),ONLCR)
 201 #define O_OCRNL(tty)    _O_FLAG((tty),OCRNL)
 202 #define O_ONOCR(tty)    _O_FLAG((tty),ONOCR)
 203 #define O_ONLRET(tty)   _O_FLAG((tty),ONLRET)
 204 #define O_OFILL(tty)    _O_FLAG((tty),OFILL)
 205 #define O_OFDEL(tty)    _O_FLAG((tty),OFDEL)
 206 #define O_NLDLY(tty)    _O_FLAG((tty),NLDLY)
 207 #define O_CRDLY(tty)    _O_FLAG((tty),CRDLY)
 208 #define O_TABDLY(tty)   _O_FLAG((tty),TABDLY)
 209 #define O_BSDLY(tty)    _O_FLAG((tty),BSDLY)
 210 #define O_VTDLY(tty)    _O_FLAG((tty),VTDLY)
 211 #define O_FFDLY(tty)    _O_FLAG((tty),FFDLY)
 212
 213 #define C_BAUD(tty)     _C_FLAG((tty),CBAUD)
 214 #define C_CSIZE(tty)    _C_FLAG((tty),CSIZE)
 215 #define C_CSTOPB(tty)   _C_FLAG((tty),CSTOPB)
 216 #define C_CREAD(tty)    _C_FLAG((tty),CREAD)
 217 #define C_PARENB(tty)   _C_FLAG((tty),PARENB)
 218 #define C_PARODD(tty)   _C_FLAG((tty),PARODD)
 219 #define C_HUPCL(tty)    _C_FLAG((tty),HUPCL)
 220 #define C_CLOCAL(tty)   _C_FLAG((tty),CLOCAL)
 221 #define C_CIBAUD(tty)   _C_FLAG((tty),CIBAUD)
 222 #define C_CRTSCTS(tty)  _C_FLAG((tty),CRTSCTS)
 223
 224 #define L_ISIG(tty)     _L_FLAG((tty),ISIG)
 225 #define L_ICANON(tty)   _L_FLAG((tty),ICANON)
 226 #define L_XCASE(tty)    _L_FLAG((tty),XCASE)
 227 #define L_ECHO(tty)     _L_FLAG((tty),ECHO)
 228 #define L_ECHOE(tty)    _L_FLAG((tty),ECHOE)
 229 #define L_ECHOK(tty)    _L_FLAG((tty),ECHOK)
 230 #define L_ECHONL(tty)   _L_FLAG((tty),ECHONL)
 231 #define L_NOFLSH(tty)   _L_FLAG((tty),NOFLSH)
 232 #define L_TOSTOP(tty)   _L_FLAG((tty),TOSTOP)
 233 #define L_ECHOCTL(tty)  _L_FLAG((tty),ECHOCTL)
 234 #define L_ECHOPRT(tty)  _L_FLAG((tty),ECHOPRT)
 235 #define L_ECHOKE(tty)   _L_FLAG((tty),ECHOKE)
 236 #define L_FLUSHO(tty)   _L_FLAG((tty),FLUSHO)
 237 #define L_PENDIN(tty)   _L_FLAG((tty),PENDIN)
 238 #define L_IEXTEN(tty)   _L_FLAG((tty),IEXTEN)
 239
 240 /*
 241  * Where all of the state associated with a tty is kept while the tty
 242  * is open.  Since the termios state should be kept even if the tty
 243  * has been closed --- for things like the baud rate, etc --- it is
 244  * not stored here, but rather a pointer to the real state is stored
 245  * here.  Possible the winsize structure should have the same
 246  * treatment, but (1) the default 80x24 is usually right and (2) it's
 247  * most often used by a windowing system, which will set the correct
 248  * size each time the window is created or resized anyway.
 249  * IMPORTANT: since this structure is dynamically allocated, it must
 250  * be no larger than 4096 bytes.  Changing TTY_FLIPBUF_SIZE will change
 251  * the size of this structure, and it needs to be done with care.
 252  *                                              - TYT, 9/14/92
 253  */
 254 struct tty_struct {
 255         int     magic;
 256         struct tty_driver driver;
 257         struct tty_ldisc ldisc;
 258         struct termios *termios, *termios_locked;
 259         int pgrp;
 260         int session;
 261         kdev_t  device;
 262         unsigned long flags;
 263         int count;
 264         struct winsize winsize;
 265         unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
 266         unsigned char low_latency:1, warned:1;
 267         unsigned char ctrl_status;
 268
 269         struct tty_struct *link;
 270         struct fasync_struct *fasync;
 271         struct tty_flip_buffer flip;
 272         int max_flip_cnt;
 273         int alt_speed;          /* For magic substitution of 38400 bps */
 274         wait_queue_head_t write_wait;
 275         wait_queue_head_t read_wait;
 276         struct tq_struct tq_hangup;
 277         void *disc_data;
 278         void *driver_data;
 279         struct list_head tty_files;
 280
 281 #define N_TTY_BUF_SIZE 4096
 282
 283         /*
 284          * The following is data for the N_TTY line discipline.  For
 285          * historical reasons, this is included in the tty structure.
 286          */
 287         unsigned int column;
 288         unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;
 289         unsigned char closing:1;
 290         unsigned short minimum_to_wake;
 291         unsigned overrun_time;
 292         int num_overrun;
 293         unsigned long process_char_map[256/(8*sizeof(unsigned long))];
 294         char *read_buf;
 295         int read_head;
 296         int read_tail;
 297         int read_cnt;
 298         unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))];
 299         int canon_data;
 300         unsigned long canon_head;
 301         unsigned int canon_column;
 302         struct semaphore atomic_read;
 303 };
 304
 305 /* tty magic number */
 306 #define TTY_MAGIC               0x5401
 307
 308 /*
 309  * These bits are used in the flags field of the tty structure.
 310  *
 311  * So that interrupts won't be able to mess up the queues,
 312  * copy_to_cooked must be atomic with respect to itself, as must
 313  * tty->write.  Thus, you must use the inline functions set_bit() and
 314  * clear_bit() to make things atomic.
 315  */
 316 #define TTY_THROTTLED 0
 317 #define TTY_IO_ERROR 1
 318 #define TTY_OTHER_CLOSED 2
 319 #define TTY_EXCLUSIVE 3
 320 #define TTY_DEBUG 4
 321 #define TTY_DO_WRITE_WAKEUP 5
 322 #define TTY_PUSH 6
 323 #define TTY_CLOSING 7
 324 #define TTY_DONT_FLIP 8
 325 #define TTY_HW_COOK_OUT 14
 326 #define TTY_HW_COOK_IN 15
 327 #define TTY_PTY_LOCK 16
 328 #define TTY_NO_WRITE_SPLIT 17
 329
 330 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
 331
 332 extern void tty_write_flush(struct tty_struct *);
 333
 334 extern struct termios tty_std_termios;
 335 extern struct tty_struct * redirect;
 336 extern struct tty_ldisc ldiscs[];
 337 extern int fg_console, last_console, want_console;
 338
 339 extern int kmsg_redirect;
 340
 341 extern void con_init(void);
 342 extern void console_init(void);
 343
 344 extern int rs_init(void);
 345 extern int lp_init(void);
 346 extern int pty_init(void);
 347 extern void tty_init(void);
 348 extern int ip2_init(void);
 349 extern int pcxe_init(void);
 350 extern int pc_init(void);
 351 extern int vcs_init(void);
 352 extern int rp_init(void);
 353 extern int cy_init(void);
 354 extern int stl_init(void);
 355 extern int stli_init(void);
 356 extern int riscom8_init(void);
 357 extern int specialix_init(void);
 358 extern int espserial_init(void);
 359 extern int macserial_init(void);
 360
 361 extern int tty_paranoia_check(struct tty_struct *tty, kdev_t device,
 362                               const char *routine);
 363 extern char *tty_name(struct tty_struct *tty, char *buf);
 364 extern void tty_wait_until_sent(struct tty_struct * tty, long timeout);
 365 extern int tty_check_change(struct tty_struct * tty);
 366 extern void stop_tty(struct tty_struct * tty);
 367 extern void start_tty(struct tty_struct * tty);
 368 extern int tty_register_ldisc(int disc, struct tty_ldisc *new_ldisc);
 369 extern int tty_register_driver(struct tty_driver *driver);
 370 extern int tty_unregister_driver(struct tty_driver *driver);
 371 extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
 372                              int buflen);
 373 extern void tty_write_message(struct tty_struct *tty, char *msg);
 374
 375 extern int is_orphaned_pgrp(int pgrp);
 376 extern int is_ignored(int sig);
 377 extern int tty_signal(int sig, struct tty_struct *tty);
 378 extern void tty_hangup(struct tty_struct * tty);
 379 extern void tty_vhangup(struct tty_struct * tty);
 380 extern void tty_unhangup(struct file *filp);
 381 extern int tty_hung_up_p(struct file * filp);
 382 extern void do_SAK(struct tty_struct *tty);
 383 extern void disassociate_ctty(int priv);
 384 extern void tty_flip_buffer_push(struct tty_struct *tty);
 385 extern int tty_get_baud_rate(struct tty_struct *tty);
 386
 387 /* n_tty.c */
 388 extern struct tty_ldisc tty_ldisc_N_TTY;
 389
 390 /* tty_ioctl.c */
 391 extern int n_tty_ioctl(struct tty_struct * tty, struct file * file,
 392                        unsigned int cmd, unsigned long arg);
 393
 394 /* serial.c */
 395
 396 extern void serial_console_init(void);
 397
 398 /* pcxx.c */
 399
 400 extern int pcxe_open(struct tty_struct *tty, struct file *filp);
 401
 402 /* printk.c */
 403
 404 extern void console_print(const char *);
 405
 406 /* vt.c */
 407
 408 extern int vt_ioctl(struct tty_struct *tty, struct file * file,
 409                     unsigned int cmd, unsigned long arg);
 410
 411 #endif /* __KERNEL__ */
 412 #endif