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 #include <linux/termios.h>
   9 
  10 #include <asm/system.h>
  11 
  12 #define NR_CONSOLES     8
  13 #define NR_LDISCS       16
  14 
  15 /*
  16  * These are set up by the setup-routine at boot-time:
  17  */
  18 
  19 struct screen_info {
  20         unsigned char  orig_x;
  21         unsigned char  orig_y;
  22         unsigned char  unused1[2];
  23         unsigned short orig_video_page;
  24         unsigned char  orig_video_mode;
  25         unsigned char  orig_video_cols;
  26         unsigned short orig_video_ega_ax;
  27         unsigned short orig_video_ega_bx;
  28         unsigned short orig_video_ega_cx;
  29         unsigned char  orig_video_lines;
  30 };
  31 
  32 extern struct screen_info screen_info;
  33 
  34 #define ORIG_X                  (screen_info.orig_x)
  35 #define ORIG_Y                  (screen_info.orig_y)
  36 #define ORIG_VIDEO_PAGE         (screen_info.orig_video_page)
  37 #define ORIG_VIDEO_MODE         (screen_info.orig_video_mode)
  38 #define ORIG_VIDEO_COLS         (screen_info.orig_video_cols)
  39 #define ORIG_VIDEO_EGA_AX       (screen_info.orig_video_ega_ax)
  40 #define ORIG_VIDEO_EGA_BX       (screen_info.orig_video_ega_bx)
  41 #define ORIG_VIDEO_EGA_CX       (screen_info.orig_video_ega_cx)
  42 #define ORIG_VIDEO_LINES        (screen_info.orig_video_lines)
  43 
  44 #define VIDEO_TYPE_MDA          0x10    /* Monochrome Text Display      */
  45 #define VIDEO_TYPE_CGA          0x11    /* CGA Display                  */
  46 #define VIDEO_TYPE_EGAM         0x20    /* EGA/VGA in Monochrome Mode   */
  47 #define VIDEO_TYPE_EGAC         0x21    /* EGA/VGA in Color Mode        */
  48 
  49 /*
  50  * This character is the same as _POSIX_VDISABLE: it cannot be used as
  51  * a c_cc[] character, but indicates that a particular special character
  52  * isn't in use (eg VINTR ahs no character etc)
  53  */
  54 #define __DISABLED_CHAR '\0'
  55 
  56 /*
  57  * See comment for the tty_struct structure before changing
  58  * TTY_BUF_SIZE.  Actually, there should be different sized tty_queue
  59  * structures for different purposes.  1024 bytes for the transmit
  60  * queue is way overkill.  TYT, 9/14/92
  61  */
  62 #define TTY_BUF_SIZE 1024       /* Must be a power of 2 */
  63 
  64 struct tty_queue {
  65         unsigned long data;
  66         unsigned long head;
  67         unsigned long tail;
  68         struct wait_queue * proc_list;
  69         unsigned char buf[TTY_BUF_SIZE];
  70 };
  71 
  72 struct serial_struct {
  73         int     type;
  74         int     line;
  75         int     port;
  76         int     irq;
  77         int     flags;
  78         int     xmit_fifo_size;
  79         int     custom_divisor;
  80         int     baud_base;
  81         int     reserved[7];
  82 };
  83 
  84 /*
  85  * These are the supported serial types.
  86  */
  87 #define PORT_UNKNOWN    0
  88 #define PORT_8250       1
  89 #define PORT_16450      2
  90 #define PORT_16550      3
  91 #define PORT_16550A     4
  92 #define PORT_MAX        4
  93 
  94 /*
  95  * Definitions for async_struct (and serial_struct) flags field
  96  */
  97 #define ASYNC_FOURPORT  0x0002  /* Set OU1, OUT2 per AST Fourport settings */
  98 #define ASYNC_SAK       0x0004  /* Secure Attention Key (Orange book) */
  99 
 100 #define ASYNC_SPD_MASK  0x0030
 101 #define ASYNC_SPD_HI    0x0010  /* Use 56000 instead of 38400 bps */
 102 #define ASYNC_SPD_VHI   0x0020  /* Use 115200 instead of 38400 bps */
 103 #define ASYNC_SPD_CUST  0x0030  /* Use user-specified divisor */
 104 
 105 #define ASYNC_FLAGS     0x0036  /* Possible legal async flags */
 106 
 107 /* Internal flags used only by kernel/chr_drv/serial.c */
 108 #define ASYNC_INITIALIZED       0x80000000 /* Serial port was initialized */
 109 #define ASYNC_CALLOUT_ACTIVE    0x40000000 /* Call out device is active */
 110 #define ASYNC_NORMAL_ACTIVE     0x20000000 /* Normal device is active */
 111 
 112 #define IS_A_CONSOLE(min)       (((min) & 0xC0) == 0x00)
 113 #define IS_A_SERIAL(min)        (((min) & 0xC0) == 0x40)
 114 #define IS_A_PTY(min)           ((min) & 0x80)
 115 #define IS_A_PTY_MASTER(min)    (((min) & 0xC0) == 0x80)
 116 #define IS_A_PTY_SLAVE(min)     (((min) & 0xC0) == 0xC0)
 117 #define PTY_OTHER(min)          ((min) ^ 0x40)
 118 
 119 #define SL_TO_DEV(line)         ((line) | 0x40)
 120 #define DEV_TO_SL(min)          ((min) & 0x3F)
 121 
 122 #define INC(a) ((a) = ((a)+1) & (TTY_BUF_SIZE-1))
 123 #define DEC(a) ((a) = ((a)-1) & (TTY_BUF_SIZE-1))
 124 #define EMPTY(a) ((a)->head == (a)->tail)
 125 #define LEFT(a) (((a)->tail-(a)->head-1)&(TTY_BUF_SIZE-1))
 126 #define LAST(a) ((a)->buf[(TTY_BUF_SIZE-1)&((a)->head-1)])
 127 #define FULL(a) (!LEFT(a))
 128 #define CHARS(a) (((a)->head-(a)->tail)&(TTY_BUF_SIZE-1))
 129 
 130 extern void put_tty_queue(char c, struct tty_queue * queue);
 131 extern int get_tty_queue(struct tty_queue * queue);
 132 
 133 #define INTR_CHAR(tty) ((tty)->termios->c_cc[VINTR])
 134 #define QUIT_CHAR(tty) ((tty)->termios->c_cc[VQUIT])
 135 #define ERASE_CHAR(tty) ((tty)->termios->c_cc[VERASE])
 136 #define KILL_CHAR(tty) ((tty)->termios->c_cc[VKILL])
 137 #define EOF_CHAR(tty) ((tty)->termios->c_cc[VEOF])
 138 #define START_CHAR(tty) ((tty)->termios->c_cc[VSTART])
 139 #define STOP_CHAR(tty) ((tty)->termios->c_cc[VSTOP])
 140 #define SUSPEND_CHAR(tty) ((tty)->termios->c_cc[VSUSP])
 141 
 142 #define _L_FLAG(tty,f)  ((tty)->termios->c_lflag & f)
 143 #define _I_FLAG(tty,f)  ((tty)->termios->c_iflag & f)
 144 #define _O_FLAG(tty,f)  ((tty)->termios->c_oflag & f)
 145 
 146 #define L_CANON(tty)    _L_FLAG((tty),ICANON)
 147 #define L_ISIG(tty)     _L_FLAG((tty),ISIG)
 148 #define L_ECHO(tty)     _L_FLAG((tty),ECHO)
 149 #define L_ECHOE(tty)    _L_FLAG((tty),ECHOE)
 150 #define L_ECHOK(tty)    _L_FLAG((tty),ECHOK)
 151 #define L_ECHONL(tty)   _L_FLAG((tty),ECHONL)
 152 #define L_ECHOCTL(tty)  _L_FLAG((tty),ECHOCTL)
 153 #define L_ECHOKE(tty)   _L_FLAG((tty),ECHOKE)
 154 #define L_TOSTOP(tty)   _L_FLAG((tty),TOSTOP)
 155 
 156 #define I_UCLC(tty)     _I_FLAG((tty),IUCLC)
 157 #define I_NLCR(tty)     _I_FLAG((tty),INLCR)
 158 #define I_CRNL(tty)     _I_FLAG((tty),ICRNL)
 159 #define I_NOCR(tty)     _I_FLAG((tty),IGNCR)
 160 #define I_IXON(tty)     _I_FLAG((tty),IXON)
 161 #define I_IXANY(tty)    _I_FLAG((tty),IXANY)
 162 #define I_STRP(tty)     _I_FLAG((tty),ISTRIP)
 163 
 164 #define O_POST(tty)     _O_FLAG((tty),OPOST)
 165 #define O_NLCR(tty)     _O_FLAG((tty),ONLCR)
 166 #define O_CRNL(tty)     _O_FLAG((tty),OCRNL)
 167 #define O_NLRET(tty)    _O_FLAG((tty),ONLRET)
 168 #define O_LCUC(tty)     _O_FLAG((tty),OLCUC)
 169 
 170 #define C_SPEED(tty)    ((tty)->termios->c_cflag & CBAUD)
 171 #define C_HUP(tty)      (C_SPEED((tty)) == B0)
 172 
 173 /*
 174  * Where all of the state associated with a tty is kept while the tty
 175  * is open.  Since the termios state should be kept even if the tty
 176  * has been closed --- for things like the baud rate, etc --- it is
 177  * not stored here, but rather a pointer to the real state is stored
 178  * here.  Possible the winsize structure should have the same
 179  * treatment, but (1) the default 80x24 is usually right and (2) it's
 180  * most often used by a windowing system, which will set the correct
 181  * size each time the window is created or resized anyway.
 182  * IMPORTANT: since this structure is dynamically allocated, it must
 183  * be no larger than 4096 bytes.  Changing TTY_BUF_SIZE will change
 184  * the size of this structure, and it needs to be done with care.
 185  *                                              - TYT, 9/14/92
 186  */
 187 struct tty_struct {
 188         struct termios *termios;
 189         int pgrp;
 190         int session;
 191         unsigned char stopped:1, status_changed:1, packet:1;
 192         unsigned char ctrl_status;
 193         short line;
 194         int disc;
 195         int flags;
 196         int count;
 197         struct winsize winsize;
 198         int  (*open)(struct tty_struct * tty, struct file * filp);
 199         void (*close)(struct tty_struct * tty, struct file * filp);
 200         void (*write)(struct tty_struct * tty);
 201         int  (*ioctl)(struct tty_struct *tty, struct file * file,
 202                     unsigned int cmd, unsigned int arg);
 203         void (*throttle)(struct tty_struct * tty, int status);
 204         void (*set_termios)(struct tty_struct *tty, struct termios * old);
 205         struct tty_struct *link;
 206         unsigned char *write_data_ptr;
 207         int write_data_cnt;
 208         void (*write_data_callback)(void * data);
 209         void * write_data_arg;
 210         struct tty_queue read_q;
 211         struct tty_queue write_q;
 212         struct tty_queue secondary;
 213         };
 214 
 215 struct tty_ldisc {
 216         int     flags;
 217         /*
 218          * The following routines are called from above.
 219          */
 220         int     (*open)(struct tty_struct *);
 221         void    (*close)(struct tty_struct *);
 222         int     (*read)(struct tty_struct * tty, struct file * file,
 223                         char * buf, int nr);
 224         int     (*write)(struct tty_struct * tty, struct file * file,
 225                          char * buf, int nr);   
 226         int     (*ioctl)(struct tty_struct * tty, struct file * file,
 227                          unsigned int cmd, unsigned int arg);
 228         /*
 229          * The following routines are called from below.
 230          */
 231         void    (*handler)(struct tty_struct *);
 232 };
 233 
 234 #define LDISC_FLAG_DEFINED      0x00000001
 235 
 236 /*
 237  * These are the different types of thottle status which can be sent
 238  * to the low-level tty driver.  The tty_io.c layer is responsible for
 239  * notifying the low-level tty driver of the following conditions:
 240  * secondary queue full, secondary queue available, and read queue
 241  * available.  The low-level driver must send the read queue full
 242  * command to itself, if it is interested in that condition.
 243  *
 244  * Note that the low-level tty driver may elect to ignore one or both
 245  * of these conditions; normally, however, it will use ^S/^Q or some
 246  * sort of hardware flow control to regulate the input to try to avoid
 247  * overflow.  While the low-level driver is responsible for all
 248  * receiving flow control, note that the ^S/^Q handling (but not
 249  * hardware flow control) is handled by the upper layer, in
 250  * copy_to_cooked.  
 251  */
 252 #define TTY_THROTTLE_SQ_FULL    1
 253 #define TTY_THROTTLE_SQ_AVAIL   2
 254 #define TTY_THROTTLE_RQ_FULL    3
 255 #define TTY_THROTTLE_RQ_AVAIL   4
 256 
 257 /*
 258  * This defines the low- and high-watermarks for the various conditions.
 259  * Again, the low-level driver is free to ignore any of these, and has
 260  * to implement RQ_THREHOLD_LW for itself if it wants it.
 261  */
 262 #define SQ_THRESHOLD_LW 16
 263 #define SQ_THRESHOLD_HW 768
 264 #define RQ_THRESHOLD_LW 16
 265 #define RQ_THRESHOLD_HW 768
 266 
 267 /*
 268  * These bits are used in the flags field of the tty structure.
 269  * 
 270  * So that interrupts won't be able to mess up the queues,
 271  * copy_to_cooked must be atomic with repect to itself, as must
 272  * tty->write.  Thus, you must use the inline functions set_bit() and
 273  * clear_bit() to make things atomic.
 274  */
 275 #define TTY_WRITE_BUSY 0
 276 #define TTY_READ_BUSY 1
 277 #define TTY_CR_PENDING 2
 278 #define TTY_SQ_THROTTLED 3
 279 #define TTY_RQ_THROTTLED 4
 280 #define TTY_IO_ERROR 5
 281 
 282 #define TTY_WRITE_FLUSH(tty) tty_write_flush((tty))
 283 #define TTY_READ_FLUSH(tty) tty_read_flush((tty))
 284 
 285 extern void tty_write_flush(struct tty_struct *);
 286 extern void tty_read_flush(struct tty_struct *);
 287 
 288 extern struct tty_struct *tty_table[];
 289 extern int tty_check_write[];
 290 extern struct tty_struct * redirect;
 291 extern struct tty_ldisc ldiscs[];
 292 extern int fg_console;
 293 extern unsigned long video_num_columns;
 294 extern unsigned long video_num_lines;
 295 extern struct wait_queue * keypress_wait;
 296 
 297 #define TTY_TABLE_IDX(nr)       ((nr) ? (nr) : (fg_console+1))
 298 #define TTY_TABLE(nr)           (tty_table[TTY_TABLE_IDX(nr)])
 299 
 300 /*      intr=^C         quit=^|         erase=del       kill=^U
 301         eof=^D          vtime=\0        vmin=\1         sxtc=\0
 302         start=^Q        stop=^S         susp=^Z         eol=\0
 303         reprint=^R      discard=^U      werase=^W       lnext=^V
 304         eol2=\0
 305 */
 306 #define INIT_C_CC "\003\034\177\025\004\0\1\0\021\023\032\0\022\017\027\026\0"
 307 
 308 extern long rs_init(long);
 309 extern long lp_init(long);
 310 extern long con_init(long);
 311 extern long tty_init(long);
 312 
 313 extern void flush_input(struct tty_struct * tty);
 314 extern void flush_output(struct tty_struct * tty);
 315 extern void wait_until_sent(struct tty_struct * tty);
 316 extern void copy_to_cooked(struct tty_struct * tty);
 317 extern int tty_register_ldisc(int disc, struct tty_ldisc *new);
 318 
 319 extern int tty_ioctl(struct inode *, struct file *, unsigned int, unsigned int);
 320 extern int is_orphaned_pgrp(int pgrp);
 321 extern int is_ignored(int sig);
 322 extern int tty_signal(int sig, struct tty_struct *tty);
 323 extern int kill_pg(int pgrp, int sig, int priv);
 324 extern int kill_sl(int sess, int sig, int priv);
 325 extern void tty_hangup(struct tty_struct * tty);
 326 extern void tty_unhangup(struct file *filp);
 327 extern void do_SAK(struct tty_struct *tty);
 328 
 329 /* tty write functions */
 330 
 331 extern void rs_write(struct tty_struct * tty);
 332 extern void con_write(struct tty_struct * tty);
 333 
 334 /* serial.c */
 335 
 336 extern int  rs_open(struct tty_struct * tty, struct file * filp);
 337 
 338 /* pty.c */
 339 
 340 extern int  pty_open(struct tty_struct * tty, struct file * filp);
 341 
 342 /* console.c */
 343 
 344 extern int con_open(struct tty_struct * tty, struct file * filp);
 345 extern void update_screen(int new_console);
 346 extern void blank_screen(void);
 347 extern void unblank_screen(void);
 348 
 349 /* vt.c */
 350 
 351 extern int vt_ioctl(struct tty_struct *tty, struct file * file,
 352                     unsigned int cmd, unsigned int arg);
 353 
 354 #endif
/* */
root/include/linux/tty.h

INCLUDED FROM
