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 #ifdef __KERNEL__
   9 #include <linux/fs.h>
  10 #include <linux/major.h>
  11 #include <linux/termios.h>
  12 #include <linux/workqueue.h>
  13 #include <linux/tty_driver.h>
  14 #include <linux/tty_ldisc.h>
  15 #include <linux/mutex.h>
  16
  17 #include <asm/system.h>
  18
  19
  20 /*
  21  * (Note: the *_driver.minor_start values 1, 64, 128, 192 are
  22  * hardcoded at present.)
  23  */
  24 #define NR_UNIX98_PTY_DEFAULT   4096      /* Default maximum for Unix98 ptys */
  25 #define NR_UNIX98_PTY_MAX       (1 << MINORBITS) /* Absolute limit */
  26 #define NR_LDISCS               19
  27
  28 /* line disciplines */
  29 #define N_TTY           0
  30 #define N_SLIP          1
  31 #define N_MOUSE         2
  32 #define N_PPP           3
  33 #define N_STRIP         4
  34 #define N_AX25          5
  35 #define N_X25           6       /* X.25 async */
  36 #define N_6PACK         7
  37 #define N_MASC          8       /* Reserved for Mobitex module <kaz@cafe.net> */
  38 #define N_R3964         9       /* Reserved for Simatic R3964 module */
  39 #define N_PROFIBUS_FDL  10      /* Reserved for Profibus */
  40 #define N_IRDA          11      /* Linux IrDa - http://irda.sourceforge.net/ */
  41 #define N_SMSBLOCK      12      /* SMS block mode - for talking to GSM data */
  42                                 /* cards about SMS messages */
  43 #define N_HDLC          13      /* synchronous HDLC */
  44 #define N_SYNC_PPP      14      /* synchronous PPP */
  45 #define N_HCI           15      /* Bluetooth HCI UART */
  46 #define N_GIGASET_M101  16      /* Siemens Gigaset M101 serial DECT adapter */
  47 #define N_SLCAN         17      /* Serial / USB serial CAN Adaptors */
  48 #define N_PPS           18      /* Pulse per Second */
  49
  50 /*
  51  * This character is the same as _POSIX_VDISABLE: it cannot be used as
  52  * a c_cc[] character, but indicates that a particular special character
  53  * isn't in use (eg VINTR has no character etc)
  54  */
  55 #define __DISABLED_CHAR '\0'
  56
  57 struct tty_buffer {
  58         struct tty_buffer *next;
  59         char *char_buf_ptr;
  60         unsigned char *flag_buf_ptr;
  61         int used;
  62         int size;
  63         int commit;
  64         int read;
  65         /* Data points here */
  66         unsigned long data[0];
  67 };
  68
  69 struct tty_bufhead {
  70         struct delayed_work work;
  71         spinlock_t lock;
  72         struct tty_buffer *head;        /* Queue head */
  73         struct tty_buffer *tail;        /* Active buffer */
  74         struct tty_buffer *free;        /* Free queue head */
  75         int memory_used;                /* Buffer space used excluding
  76                                                                 free queue */
  77 };
  78 /*
  79  * When a break, frame error, or parity error happens, these codes are
  80  * stuffed into the flags buffer.
  81  */
  82 #define TTY_NORMAL      0
  83 #define TTY_BREAK       1
  84 #define TTY_FRAME       2
  85 #define TTY_PARITY      3
  86 #define TTY_OVERRUN     4
  87
  88 #define INTR_CHAR(tty) ((tty)->termios->c_cc[VINTR])
  89 #define QUIT_CHAR(tty) ((tty)->termios->c_cc[VQUIT])
  90 #define ERASE_CHAR(tty) ((tty)->termios->c_cc[VERASE])
  91 #define KILL_CHAR(tty) ((tty)->termios->c_cc[VKILL])
  92 #define EOF_CHAR(tty) ((tty)->termios->c_cc[VEOF])
  93 #define TIME_CHAR(tty) ((tty)->termios->c_cc[VTIME])
  94 #define MIN_CHAR(tty) ((tty)->termios->c_cc[VMIN])
  95 #define SWTC_CHAR(tty) ((tty)->termios->c_cc[VSWTC])
  96 #define START_CHAR(tty) ((tty)->termios->c_cc[VSTART])
  97 #define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP])
  98 #define SUSP_CHAR(tty) ((tty)->termios->c_cc[VSUSP])
  99 #define EOL_CHAR(tty) ((tty)->termios->c_cc[VEOL])
 100 #define REPRINT_CHAR(tty) ((tty)->termios->c_cc[VREPRINT])
 101 #define DISCARD_CHAR(tty) ((tty)->termios->c_cc[VDISCARD])
 102 #define WERASE_CHAR(tty) ((tty)->termios->c_cc[VWERASE])
 103 #define LNEXT_CHAR(tty) ((tty)->termios->c_cc[VLNEXT])
 104 #define EOL2_CHAR(tty) ((tty)->termios->c_cc[VEOL2])
 105
 106 #define _I_FLAG(tty, f) ((tty)->termios->c_iflag & (f))
 107 #define _O_FLAG(tty, f) ((tty)->termios->c_oflag & (f))
 108 #define _C_FLAG(tty, f) ((tty)->termios->c_cflag & (f))
 109 #define _L_FLAG(tty, f) ((tty)->termios->c_lflag & (f))
 110
 111 #define I_IGNBRK(tty)   _I_FLAG((tty), IGNBRK)
 112 #define I_BRKINT(tty)   _I_FLAG((tty), BRKINT)
 113 #define I_IGNPAR(tty)   _I_FLAG((tty), IGNPAR)
 114 #define I_PARMRK(tty)   _I_FLAG((tty), PARMRK)
 115 #define I_INPCK(tty)    _I_FLAG((tty), INPCK)
 116 #define I_ISTRIP(tty)   _I_FLAG((tty), ISTRIP)
 117 #define I_INLCR(tty)    _I_FLAG((tty), INLCR)
 118 #define I_IGNCR(tty)    _I_FLAG((tty), IGNCR)
 119 #define I_ICRNL(tty)    _I_FLAG((tty), ICRNL)
 120 #define I_IUCLC(tty)    _I_FLAG((tty), IUCLC)
 121 #define I_IXON(tty)     _I_FLAG((tty), IXON)
 122 #define I_IXANY(tty)    _I_FLAG((tty), IXANY)
 123 #define I_IXOFF(tty)    _I_FLAG((tty), IXOFF)
 124 #define I_IMAXBEL(tty)  _I_FLAG((tty), IMAXBEL)
 125 #define I_IUTF8(tty)    _I_FLAG((tty), IUTF8)
 126
 127 #define O_OPOST(tty)    _O_FLAG((tty), OPOST)
 128 #define O_OLCUC(tty)    _O_FLAG((tty), OLCUC)
 129 #define O_ONLCR(tty)    _O_FLAG((tty), ONLCR)
 130 #define O_OCRNL(tty)    _O_FLAG((tty), OCRNL)
 131 #define O_ONOCR(tty)    _O_FLAG((tty), ONOCR)
 132 #define O_ONLRET(tty)   _O_FLAG((tty), ONLRET)
 133 #define O_OFILL(tty)    _O_FLAG((tty), OFILL)
 134 #define O_OFDEL(tty)    _O_FLAG((tty), OFDEL)
 135 #define O_NLDLY(tty)    _O_FLAG((tty), NLDLY)
 136 #define O_CRDLY(tty)    _O_FLAG((tty), CRDLY)
 137 #define O_TABDLY(tty)   _O_FLAG((tty), TABDLY)
 138 #define O_BSDLY(tty)    _O_FLAG((tty), BSDLY)
 139 #define O_VTDLY(tty)    _O_FLAG((tty), VTDLY)
 140 #define O_FFDLY(tty)    _O_FLAG((tty), FFDLY)
 141
 142 #define C_BAUD(tty)     _C_FLAG((tty), CBAUD)
 143 #define C_CSIZE(tty)    _C_FLAG((tty), CSIZE)
 144 #define C_CSTOPB(tty)   _C_FLAG((tty), CSTOPB)
 145 #define C_CREAD(tty)    _C_FLAG((tty), CREAD)
 146 #define C_PARENB(tty)   _C_FLAG((tty), PARENB)
 147 #define C_PARODD(tty)   _C_FLAG((tty), PARODD)
 148 #define C_HUPCL(tty)    _C_FLAG((tty), HUPCL)
 149 #define C_CLOCAL(tty)   _C_FLAG((tty), CLOCAL)
 150 #define C_CIBAUD(tty)   _C_FLAG((tty), CIBAUD)
 151 #define C_CRTSCTS(tty)  _C_FLAG((tty), CRTSCTS)
 152
 153 #define L_ISIG(tty)     _L_FLAG((tty), ISIG)
 154 #define L_ICANON(tty)   _L_FLAG((tty), ICANON)
 155 #define L_XCASE(tty)    _L_FLAG((tty), XCASE)
 156 #define L_ECHO(tty)     _L_FLAG((tty), ECHO)
 157 #define L_ECHOE(tty)    _L_FLAG((tty), ECHOE)
 158 #define L_ECHOK(tty)    _L_FLAG((tty), ECHOK)
 159 #define L_ECHONL(tty)   _L_FLAG((tty), ECHONL)
 160 #define L_NOFLSH(tty)   _L_FLAG((tty), NOFLSH)
 161 #define L_TOSTOP(tty)   _L_FLAG((tty), TOSTOP)
 162 #define L_ECHOCTL(tty)  _L_FLAG((tty), ECHOCTL)
 163 #define L_ECHOPRT(tty)  _L_FLAG((tty), ECHOPRT)
 164 #define L_ECHOKE(tty)   _L_FLAG((tty), ECHOKE)
 165 #define L_FLUSHO(tty)   _L_FLAG((tty), FLUSHO)
 166 #define L_PENDIN(tty)   _L_FLAG((tty), PENDIN)
 167 #define L_IEXTEN(tty)   _L_FLAG((tty), IEXTEN)
 168
 169 struct device;
 170 struct signal_struct;
 171
 172 /*
 173  * Port level information. Each device keeps its own port level information
 174  * so provide a common structure for those ports wanting to use common support
 175  * routines.
 176  *
 177  * The tty port has a different lifetime to the tty so must be kept apart.
 178  * In addition be careful as tty -> port mappings are valid for the life
 179  * of the tty object but in many cases port -> tty mappings are valid only
 180  * until a hangup so don't use the wrong path.
 181  */
 182
 183 struct tty_port {
 184         struct tty_struct       *tty;           /* Back pointer */
 185         spinlock_t              lock;           /* Lock protecting tty field */
 186         int                     blocked_open;   /* Waiting to open */
 187         int                     count;          /* Usage count */
 188         wait_queue_head_t       open_wait;      /* Open waiters */
 189         wait_queue_head_t       close_wait;     /* Close waiters */
 190         unsigned long           flags;          /* TTY flags ASY_*/
 191         struct mutex            mutex;          /* Locking */
 192         unsigned char           *xmit_buf;      /* Optional buffer */
 193         int                     close_delay;    /* Close port delay */
 194         int                     closing_wait;   /* Delay for output */
 195 };
 196
 197 /*
 198  * Where all of the state associated with a tty is kept while the tty
 199  * is open.  Since the termios state should be kept even if the tty
 200  * has been closed --- for things like the baud rate, etc --- it is
 201  * not stored here, but rather a pointer to the real state is stored
 202  * here.  Possible the winsize structure should have the same
 203  * treatment, but (1) the default 80x24 is usually right and (2) it's
 204  * most often used by a windowing system, which will set the correct
 205  * size each time the window is created or resized anyway.
 206  *                                              - TYT, 9/14/92
 207  */
 208
 209 struct tty_operations;
 210
 211 struct tty_struct {
 212         int     magic;
 213         struct kref kref;
 214         struct tty_driver *driver;
 215         const struct tty_operations *ops;
 216         int index;
 217         /* The ldisc objects are protected by tty_ldisc_lock at the moment */
 218         struct tty_ldisc ldisc;
 219         struct mutex termios_mutex;
 220         spinlock_t ctrl_lock;
 221         /* Termios values are protected by the termios mutex */
 222         struct ktermios *termios, *termios_locked;
 223         struct termiox *termiox;        /* May be NULL for unsupported */
 224         char name[64];
 225         struct pid *pgrp;               /* Protected by ctrl lock */
 226         struct pid *session;
 227         unsigned long flags;
 228         int count;
 229         struct winsize winsize;         /* termios mutex */
 230         unsigned char stopped:1, hw_stopped:1, flow_stopped:1, packet:1;
 231         unsigned char low_latency:1, warned:1;
 232         unsigned char ctrl_status;      /* ctrl_lock */
 233         unsigned int receive_room;      /* Bytes free for queue */
 234
 235         struct tty_struct *link;
 236         struct fasync_struct *fasync;
 237         struct tty_bufhead buf;         /* Locked internally */
 238         int alt_speed;          /* For magic substitution of 38400 bps */
 239         wait_queue_head_t write_wait;
 240         wait_queue_head_t read_wait;
 241         struct work_struct hangup_work;
 242         void *disc_data;
 243         void *driver_data;
 244         struct list_head tty_files;
 245
 246 #define N_TTY_BUF_SIZE 4096
 247
 248         /*
 249          * The following is data for the N_TTY line discipline.  For
 250          * historical reasons, this is included in the tty structure.
 251          * Mostly locked by the BKL.
 252          */
 253         unsigned int column;
 254         unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;
 255         unsigned char closing:1;
 256         unsigned short minimum_to_wake;
 257         unsigned long overrun_time;
 258         int num_overrun;
 259         unsigned long process_char_map[256/(8*sizeof(unsigned long))];
 260         char *read_buf;
 261         int read_head;
 262         int read_tail;
 263         int read_cnt;
 264         unsigned long read_flags[N_TTY_BUF_SIZE/(8*sizeof(unsigned long))];
 265         int canon_data;
 266         unsigned long canon_head;
 267         unsigned int canon_column;
 268         struct mutex atomic_read_lock;
 269         struct mutex atomic_write_lock;
 270         unsigned char *write_buf;
 271         int write_cnt;
 272         spinlock_t read_lock;
 273         /* If the tty has a pending do_SAK, queue it here - akpm */
 274         struct work_struct SAK_work;
 275         struct tty_port *port;
 276 };
 277
 278 /* tty magic number */
 279 #define TTY_MAGIC               0x5401
 280
 281 /*
 282  * These bits are used in the flags field of the tty structure.
 283  *
 284  * So that interrupts won't be able to mess up the queues,
 285  * copy_to_cooked must be atomic with respect to itself, as must
 286  * tty->write.  Thus, you must use the inline functions set_bit() and
 287  * clear_bit() to make things atomic.
 288  */
 289 #define TTY_THROTTLED           0       /* Call unthrottle() at threshold min */
 290 #define TTY_IO_ERROR            1       /* Cause an I/O error (may be no ldisc too) */
 291 #define TTY_OTHER_CLOSED        2       /* Other side (if any) has closed */
 292 #define TTY_EXCLUSIVE           3       /* Exclusive open mode */
 293 #define TTY_DEBUG               4       /* Debugging */
 294 #define TTY_DO_WRITE_WAKEUP     5       /* Call write_wakeup after queuing new */
 295 #define TTY_PUSH                6       /* n_tty private */
 296 #define TTY_CLOSING             7       /* ->close() in progress */
 297 #define TTY_LDISC               9       /* Line discipline attached */
 298 #define TTY_HW_COOK_OUT         14      /* Hardware can do output cooking */
 299 #define TTY_HW_COOK_IN          15      /* Hardware can do input cooking */
 300 #define TTY_PTY_LOCK            16      /* pty private */
 301 #define TTY_NO_WRITE_SPLIT      17      /* Preserve write boundaries to driver */
 302 #define TTY_HUPPED              18      /* Post driver->hangup() */
 303 #define TTY_FLUSHING            19      /* Flushing to ldisc in progress */
 304 #define TTY_FLUSHPENDING        20      /* Queued buffer flush pending */
 305
 306 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
 307
 308 extern void tty_write_flush(struct tty_struct *);
 309
 310 extern struct ktermios tty_std_termios;
 311
 312 extern int kmsg_redirect;
 313
 314 extern void console_init(void);
 315 extern int vcs_init(void);
 316
 317 extern struct class *tty_class;
 318
 319 /**
 320  *      tty_kref_get            -       get a tty reference
 321  *      @tty: tty device
 322  *
 323  *      Return a new reference to a tty object. The caller must hold
 324  *      sufficient locks/counts to ensure that their existing reference cannot
 325  *      go away
 326  */
 327
 328 extern inline struct tty_struct *tty_kref_get(struct tty_struct *tty)
 329 {
 330         if (tty)
 331                 kref_get(&tty->kref);
 332         return tty;
 333 }
 334 extern void tty_kref_put(struct tty_struct *tty);
 335
 336 extern int tty_paranoia_check(struct tty_struct *tty, struct inode *inode,
 337                               const char *routine);
 338 extern char *tty_name(struct tty_struct *tty, char *buf);
 339 extern void tty_wait_until_sent(struct tty_struct *tty, long timeout);
 340 extern int tty_check_change(struct tty_struct *tty);
 341 extern void stop_tty(struct tty_struct *tty);
 342 extern void start_tty(struct tty_struct *tty);
 343 extern int tty_register_driver(struct tty_driver *driver);
 344 extern int tty_unregister_driver(struct tty_driver *driver);
 345 extern struct device *tty_register_device(struct tty_driver *driver,
 346                                           unsigned index, struct device *dev);
 347 extern void tty_unregister_device(struct tty_driver *driver, unsigned index);
 348 extern int tty_read_raw_data(struct tty_struct *tty, unsigned char *bufp,
 349                              int buflen);
 350 extern void tty_write_message(struct tty_struct *tty, char *msg);
 351 extern int tty_put_char(struct tty_struct *tty, unsigned char c);
 352 extern int tty_chars_in_buffer(struct tty_struct *tty);
 353 extern int tty_write_room(struct tty_struct *tty);
 354 extern void tty_driver_flush_buffer(struct tty_struct *tty);
 355 extern void tty_throttle(struct tty_struct *tty);
 356 extern void tty_unthrottle(struct tty_struct *tty);
 357 extern int tty_do_resize(struct tty_struct *tty, struct tty_struct *real_tty,
 358                                                 struct winsize *ws);
 359 extern void tty_shutdown(struct tty_struct *tty);
 360 extern void tty_free_termios(struct tty_struct *tty);
 361 extern int is_current_pgrp_orphaned(void);
 362 extern struct pid *tty_get_pgrp(struct tty_struct *tty);
 363 extern int is_ignored(int sig);
 364 extern int tty_signal(int sig, struct tty_struct *tty);
 365 extern void tty_hangup(struct tty_struct *tty);
 366 extern void tty_vhangup(struct tty_struct *tty);
 367 extern void tty_vhangup_self(void);
 368 extern void tty_unhangup(struct file *filp);
 369 extern int tty_hung_up_p(struct file *filp);
 370 extern void do_SAK(struct tty_struct *tty);
 371 extern void __do_SAK(struct tty_struct *tty);
 372 extern void disassociate_ctty(int priv);
 373 extern void no_tty(void);
 374 extern void tty_flip_buffer_push(struct tty_struct *tty);
 375 extern void tty_buffer_free_all(struct tty_struct *tty);
 376 extern void tty_buffer_flush(struct tty_struct *tty);
 377 extern void tty_buffer_init(struct tty_struct *tty);
 378 extern speed_t tty_get_baud_rate(struct tty_struct *tty);
 379 extern speed_t tty_termios_baud_rate(struct ktermios *termios);
 380 extern speed_t tty_termios_input_baud_rate(struct ktermios *termios);
 381 extern void tty_termios_encode_baud_rate(struct ktermios *termios,
 382                                                 speed_t ibaud, speed_t obaud);
 383 extern void tty_encode_baud_rate(struct tty_struct *tty,
 384                                                 speed_t ibaud, speed_t obaud);
 385 extern void tty_termios_copy_hw(struct ktermios *new, struct ktermios *old);
 386 extern int tty_termios_hw_change(struct ktermios *a, struct ktermios *b);
 387
 388 extern struct tty_ldisc *tty_ldisc_ref(struct tty_struct *);
 389 extern void tty_ldisc_deref(struct tty_ldisc *);
 390 extern struct tty_ldisc *tty_ldisc_ref_wait(struct tty_struct *);
 391 extern const struct file_operations tty_ldiscs_proc_fops;
 392
 393 extern void tty_wakeup(struct tty_struct *tty);
 394 extern void tty_ldisc_flush(struct tty_struct *tty);
 395
 396 extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 397 extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
 398                         unsigned int cmd, unsigned long arg);
 399 extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
 400 extern dev_t tty_devnum(struct tty_struct *tty);
 401 extern void proc_clear_tty(struct task_struct *p);
 402 extern struct tty_struct *get_current_tty(void);
 403 extern void tty_default_fops(struct file_operations *fops);
 404 extern struct tty_struct *alloc_tty_struct(void);
 405 extern void free_tty_struct(struct tty_struct *tty);
 406 extern void initialize_tty_struct(struct tty_struct *tty,
 407                 struct tty_driver *driver, int idx);
 408 extern struct tty_struct *tty_init_dev(struct tty_driver *driver, int idx,
 409                                                                 int first_ok);
 410 extern void tty_release_dev(struct file *filp);
 411 extern int tty_init_termios(struct tty_struct *tty);
 412
 413 extern struct mutex tty_mutex;
 414
 415 extern void tty_write_unlock(struct tty_struct *tty);
 416 extern int tty_write_lock(struct tty_struct *tty, int ndelay);
 417 #define tty_is_writelocked(tty)  (mutex_is_locked(&tty->atomic_write_lock))
 418
 419 extern void tty_port_init(struct tty_port *port);
 420 extern int tty_port_alloc_xmit_buf(struct tty_port *port);
 421 extern void tty_port_free_xmit_buf(struct tty_port *port);
 422 extern struct tty_struct *tty_port_tty_get(struct tty_port *port);
 423 extern void tty_port_tty_set(struct tty_port *port, struct tty_struct *tty);
 424
 425 extern int tty_register_ldisc(int disc, struct tty_ldisc_ops *new_ldisc);
 426 extern int tty_unregister_ldisc(int disc);
 427 extern int tty_set_ldisc(struct tty_struct *tty, int ldisc);
 428 extern int tty_ldisc_setup(struct tty_struct *tty, struct tty_struct *o_tty);
 429 extern void tty_ldisc_release(struct tty_struct *tty, struct tty_struct *o_tty);
 430 extern void tty_ldisc_init(struct tty_struct *tty);
 431 extern void tty_ldisc_begin(void);
 432 /* This last one is just for the tty layer internals and shouldn't be used elsewhere */
 433 extern void tty_ldisc_enable(struct tty_struct *tty);
 434
 435
 436 /* n_tty.c */
 437 extern struct tty_ldisc_ops tty_ldisc_N_TTY;
 438
 439 /* tty_audit.c */
 440 #ifdef CONFIG_AUDIT
 441 extern void tty_audit_add_data(struct tty_struct *tty, unsigned char *data,
 442                                size_t size);
 443 extern void tty_audit_exit(void);
 444 extern void tty_audit_fork(struct signal_struct *sig);
 445 extern void tty_audit_push(struct tty_struct *tty);
 446 extern void tty_audit_push_task(struct task_struct *tsk,
 447                                         uid_t loginuid, u32 sessionid);
 448 #else
 449 static inline void tty_audit_add_data(struct tty_struct *tty,
 450                                       unsigned char *data, size_t size)
 451 {
 452 }
 453 static inline void tty_audit_exit(void)
 454 {
 455 }
 456 static inline void tty_audit_fork(struct signal_struct *sig)
 457 {
 458 }
 459 static inline void tty_audit_push(struct tty_struct *tty)
 460 {
 461 }
 462 static inline void tty_audit_push_task(struct task_struct *tsk,
 463                                         uid_t loginuid, u32 sessionid)
 464 {
 465 }
 466 #endif
 467
 468 /* tty_ioctl.c */
 469 extern int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
 470                        unsigned int cmd, unsigned long arg);
 471
 472 /* serial.c */
 473
 474 extern void serial_console_init(void);
 475
 476 /* pcxx.c */
 477
 478 extern int pcxe_open(struct tty_struct *tty, struct file *filp);
 479
 480 /* printk.c */
 481
 482 extern void console_print(const char *);
 483
 484 /* vt.c */
 485
 486 extern int vt_ioctl(struct tty_struct *tty, struct file *file,
 487                     unsigned int cmd, unsigned long arg);
 488
 489 #endif /* __KERNEL__ */
 490 #endif