root/kernel/chr_drv/vt.c

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DEFINITIONS

This source file includes following definitions.
  1. kd_nosound
  2. kd_mksound
  3. vt_ioctl

   1 /*
   2  *  kernel/chr_drv/vt.c
   3  *
   4  *  Copyright (C) 1992 obz under the linux copyright
   5  */
   6 
   7 #include <linux/types.h>
   8 #include <linux/errno.h>
   9 #include <linux/sched.h>
  10 #include <linux/tty.h>
  11 #include <linux/timer.h>
  12 #include <linux/kernel.h>
  13 #include <linux/keyboard.h>
  14 #include <linux/kd.h>
  15 #include <linux/vt.h>
  16 
  17 #include <asm/io.h>
  18 #include <asm/segment.h>
  19 
  20 #include "vt_kern.h"
  21 
  22 /*
  23  * Console (vt and kd) routines, as defined by USL SVR4 manual, and by
  24  * experimentation and study of X386 SYSV handling.
  25  *
  26  * One point of difference: SYSV vt's are /dev/vtX, which X >= 0, and
  27  * /dev/console is a separate ttyp. Under Linux, /dev/tty0 is /dev/console,
  28  * and the vc start at /dev/ttyX, X >= 1. We maintain that here, so we will
  29  * always treat our set of vt as numbered 1..NR_CONSOLES (corresponding to
  30  * ttys 0..NR_CONSOLES-1). Explicitly naming VT 0 is illegal, but using
  31  * /dev/tty0 (fg_console) as a target is legal, since an implicit aliasing
  32  * to the current console is done by the main ioctl code.
  33  */
  34 
  35 struct vt_cons vt_cons[NR_CONSOLES];
  36 
  37 extern int sys_ioperm(unsigned long from, unsigned long num, int on);
  38 extern void change_console(unsigned int new_console);
  39 extern void complete_change_console(unsigned int new_console);
  40 extern int vt_waitactive(void);
  41 
  42 /*
  43  * these are the valid i/o ports we're allowed to change. they map all the
  44  * video ports
  45  */
  46 #define GPFIRST 0x3b4
  47 #define GPLAST 0x3df
  48 #define GPNUM (GPLAST - GPFIRST + 1)
  49 
  50 /*
  51  * Generates sound of some count for some number of clock ticks
  52  * [count = 1193180 / frequency]
  53  *
  54  * If freq is 0, will turn off sound, else will turn it on for that time.
  55  * If msec is 0, will return immediately, else will sleep for msec time, then
  56  * turn sound off.
  57  *
  58  * We use the BEEP_TIMER vector since we're using the same method to
  59  * generate sound, and we'll overwrite any beep in progress. That may
  60  * be something to fix later, if we like.
  61  *
  62  * We also return immediately, which is what was implied within the X
  63  * comments - KDMKTONE doesn't put the process to sleep.
  64  */
  65 static void
  66 kd_nosound(unsigned long ignored)
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  67 {
  68         /* disable counter 2 */
  69         outb(inb_p(0x61)&0xFC, 0x61);
  70         return;
  71 }
  72 
  73 void
  74 kd_mksound(unsigned int count, unsigned int ticks)
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  75 {
  76         static struct timer_list sound_timer = { NULL, 0, 0, kd_nosound };
  77 
  78         cli();
  79         del_timer(&sound_timer);
  80         if (count) {
  81                 /* enable counter 2 */
  82                 outb_p(inb_p(0x61)|3, 0x61);
  83                 /* set command for counter 2, 2 byte write */
  84                 outb_p(0xB6, 0x43);
  85                 /* select desired HZ */
  86                 outb_p(count & 0xff, 0x42);
  87                 outb((count >> 8) & 0xff, 0x42);
  88 
  89                 if (ticks) {
  90                         sound_timer.expires = ticks;
  91                         add_timer(&sound_timer);
  92                 }
  93         } else
  94                 kd_nosound(0);
  95         sti();
  96         return;
  97 }
  98 
  99 /*
 100  * We handle the console-specific ioctl's here.  We allow the
 101  * capability to modify any console, not just the fg_console. 
 102  */
 103 int vt_ioctl(struct tty_struct *tty, struct file * file,
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 104              unsigned int cmd, unsigned long arg)
 105 {
 106         int console, i;
 107         unsigned char ucval;
 108         struct kbd_struct * kbd;
 109 
 110         console = tty->line - 1;
 111 
 112         if (console < 0 || console >= NR_CONSOLES)
 113                 return -EINVAL;
 114 
 115         kbd = kbd_table + console;
 116         switch (cmd) {
 117         case KIOCSOUND:
 118                 kd_mksound((unsigned int)arg, 0);
 119                 return 0;
 120 
 121         case KDMKTONE:
 122         {
 123                 unsigned int ticks = HZ * ((arg >> 16) & 0xffff) / 1000;
 124 
 125                 /*
 126                  * Generate the tone for the appropriate number of ticks.
 127                  * If the time is zero, turn off sound ourselves.
 128                  */
 129                 kd_mksound(arg & 0xffff, ticks);
 130                 if (ticks == 0)
 131                         kd_nosound(0);
 132                 return 0;
 133         }
 134 
 135         case KDGKBTYPE:
 136                 /*
 137                  * this is naive.
 138                  */
 139                 i = verify_area(VERIFY_WRITE, (void *) arg, sizeof(unsigned char));
 140                 if (!i)
 141                         put_fs_byte(KB_101, (unsigned char *) arg);
 142                 return i;
 143 
 144         case KDADDIO:
 145         case KDDELIO:
 146                 /*
 147                  * KDADDIO and KDDELIO may be able to add ports beyond what
 148                  * we reject here, but to be safe...
 149                  */
 150                 if (arg < GPFIRST || arg > GPLAST)
 151                         return -EINVAL;
 152                 return sys_ioperm(arg, 1, (cmd == KDADDIO)) ? -ENXIO : 0;
 153 
 154         case KDENABIO:
 155         case KDDISABIO:
 156                 return sys_ioperm(GPFIRST, GPNUM,
 157                                   (cmd == KDENABIO)) ? -ENXIO : 0;
 158 
 159         case KDSETMODE:
 160                 /*
 161                  * currently, setting the mode from KD_TEXT to KD_GRAPHICS
 162                  * doesn't do a whole lot. i'm not sure if it should do any
 163                  * restoration of modes or what...
 164                  */
 165                 switch (arg) {
 166                 case KD_GRAPHICS:
 167                         break;
 168                 case KD_TEXT0:
 169                 case KD_TEXT1:
 170                         arg = KD_TEXT;
 171                 case KD_TEXT:
 172                         break;
 173                 default:
 174                         return -EINVAL;
 175                 }
 176                 if (vt_cons[console].vc_mode == (unsigned char) arg)
 177                         return 0;
 178                 vt_cons[console].vc_mode = (unsigned char) arg;
 179                 if (console != fg_console)
 180                         return 0;
 181                 /*
 182                  * explicitly blank/unblank the screen if switching modes
 183                  */
 184                 if (arg == KD_TEXT)
 185                         unblank_screen();
 186                 else {
 187                         timer_active &= ~(1<<BLANK_TIMER);
 188                         blank_screen();
 189                 }
 190                 return 0;
 191 
 192         case KDGETMODE:
 193                 i = verify_area(VERIFY_WRITE, (void *) arg, sizeof(unsigned long));
 194                 if (!i)
 195                         put_fs_long(vt_cons[console].vc_mode, (unsigned long *) arg);
 196                 return i;
 197 
 198         case KDMAPDISP:
 199         case KDUNMAPDISP:
 200                 /*
 201                  * these work like a combination of mmap and KDENABIO.
 202                  * this could be easily finished.
 203                  */
 204                 return -EINVAL;
 205 
 206         case KDSKBMODE:
 207                 if (arg == K_RAW) {
 208                         set_vc_kbd_flag(kbd, VC_RAW);
 209                 } else if (arg == K_XLATE) {
 210                         clr_vc_kbd_flag(kbd, VC_RAW);
 211                 }
 212                 else
 213                         return -EINVAL;
 214                 flush_input(tty);
 215                 return 0;
 216 
 217         case KDGKBMODE:
 218                 i = verify_area(VERIFY_WRITE, (void *) arg, sizeof(unsigned long));
 219                 if (!i) {
 220                         ucval = vc_kbd_flag(kbd, VC_RAW);
 221                         put_fs_long(ucval ? K_RAW : K_XLATE, (unsigned long *) arg);
 222                 }
 223                 return i;
 224 
 225         case KDGKBENT:
 226         {
 227                 struct kbentry * const a = (struct kbentry *)arg;
 228                 u_char i;
 229                 u_char s;
 230 
 231                 verify_area(VERIFY_WRITE, (void *)a, sizeof(struct kbentry));
 232                 if ((i = get_fs_byte(&a->kb_index)) >= NR_KEYS)
 233                         return -EINVAL;
 234                 if ((s = get_fs_byte(&a->kb_table)) >= NR_KEYMAPS)
 235                         return -EINVAL;
 236                 put_fs_word(key_map[s][i], &a->kb_value);
 237                 return 0;
 238         }
 239 
 240         case KDSKBENT:
 241         {
 242                 const struct kbentry * a = (struct kbentry *)arg;
 243                 u_char i;
 244                 u_char s;
 245                 u_short v;
 246 
 247                 verify_area(VERIFY_WRITE, (void *)a, sizeof(struct kbentry));
 248                 if ((i = get_fs_byte(&a->kb_index)) >= NR_KEYS)
 249                         return -EINVAL;
 250                 if ((s = get_fs_byte(&a->kb_table)) >= NR_KEYMAPS)
 251                         return -EINVAL;
 252                 if (KTYP(v = get_fs_word(&a->kb_value)) >= NR_TYPES)
 253                         return -EINVAL;
 254                 if (KVAL(v) > max_vals[KTYP(v)])
 255                         return -EINVAL;
 256                 key_map[s][i] = v;
 257                 return 0;
 258         }
 259 
 260         case KDGETLED:
 261                 i = verify_area(VERIFY_WRITE, (void *) arg, sizeof(unsigned char));
 262                 if (i)
 263                         return i;
 264                 ucval = 0;
 265                 if (vc_kbd_flag(kbd, VC_SCROLLOCK))
 266                         ucval |= LED_SCR;
 267                 if (vc_kbd_flag(kbd, VC_NUMLOCK))
 268                         ucval |= LED_NUM;
 269                 if (vc_kbd_flag(kbd, VC_CAPSLOCK))
 270                         ucval |= LED_CAP;
 271                 put_fs_byte(ucval, (unsigned char *) arg);
 272                 return 0;
 273 
 274         case KDSETLED:
 275                 if (arg & ~7)
 276                         return -EINVAL;
 277                 if (arg & LED_SCR)
 278                         set_vc_kbd_flag(kbd, VC_SCROLLOCK);
 279                 else
 280                         clr_vc_kbd_flag(kbd, VC_SCROLLOCK);
 281                 if (arg & LED_NUM)
 282                         set_vc_kbd_flag(kbd, VC_NUMLOCK);
 283                 else
 284                         clr_vc_kbd_flag(kbd, VC_NUMLOCK);
 285                 if (arg & LED_CAP)
 286                         set_vc_kbd_flag(kbd, VC_CAPSLOCK);
 287                 else
 288                         clr_vc_kbd_flag(kbd, VC_CAPSLOCK);
 289                 set_leds();
 290                 return 0;
 291 
 292         case VT_SETMODE:
 293         {
 294                 struct vt_mode *vtmode = (struct vt_mode *)arg;
 295                 char mode;
 296 
 297                 i = verify_area(VERIFY_WRITE, (void *)vtmode, sizeof(struct vt_mode));
 298                 if (i)
 299                         return i;
 300                 mode = get_fs_byte(&vtmode->mode);
 301                 if (mode != VT_AUTO && mode != VT_PROCESS)
 302                         return -EINVAL;
 303                 vt_cons[console].vt_mode.mode = mode;
 304                 vt_cons[console].vt_mode.waitv = get_fs_byte(&vtmode->waitv);
 305                 vt_cons[console].vt_mode.relsig = get_fs_word(&vtmode->relsig);
 306                 vt_cons[console].vt_mode.acqsig = get_fs_word(&vtmode->acqsig);
 307                 /* the frsig is ignored, so we set it to 0 */
 308                 vt_cons[console].vt_mode.frsig = 0;
 309                 vt_cons[console].vt_pid = current->pid;
 310                 vt_cons[console].vt_newvt = 0;
 311                 return 0;
 312         }
 313 
 314         case VT_GETMODE:
 315         {
 316                 struct vt_mode *vtmode = (struct vt_mode *)arg;
 317 
 318                 i = verify_area(VERIFY_WRITE, (void *)arg, sizeof(struct vt_mode));
 319                 if (i)
 320                         return i;
 321                 put_fs_byte(vt_cons[console].vt_mode.mode, &vtmode->mode);
 322                 put_fs_byte(vt_cons[console].vt_mode.waitv, &vtmode->waitv);
 323                 put_fs_word(vt_cons[console].vt_mode.relsig, &vtmode->relsig);
 324                 put_fs_word(vt_cons[console].vt_mode.acqsig, &vtmode->acqsig);
 325                 put_fs_word(vt_cons[console].vt_mode.frsig, &vtmode->frsig);
 326                 return 0;
 327         }
 328 
 329         /*
 330          * Returns global vt state. Note that VT 0 is always open, since
 331          * it's an alias for the current VT, and people can't use it here.
 332          */
 333         case VT_GETSTATE:
 334         {
 335                 struct vt_stat *vtstat = (struct vt_stat *)arg;
 336                 unsigned short state, mask;
 337 
 338                 i = verify_area(VERIFY_WRITE,(void *)vtstat, sizeof(struct vt_stat));
 339                 if (i)
 340                         return i;
 341                 put_fs_word(fg_console + 1, &vtstat->v_active);
 342                 state = 1;      /* /dev/tty0 is always open */
 343                 for (i = 1, mask = 2; i <= NR_CONSOLES; ++i, mask <<= 1)
 344                         if (tty_table[i] && tty_table[i]->count > 0)
 345                                 state |= mask;
 346                 put_fs_word(state, &vtstat->v_state);
 347                 return 0;
 348         }
 349 
 350         /*
 351          * Returns the first available (non-opened) console.
 352          */
 353         case VT_OPENQRY:
 354                 i = verify_area(VERIFY_WRITE, (void *) arg, sizeof(long));
 355                 if (i)
 356                         return i;
 357                 for (i = 1; i <= NR_CONSOLES; ++i)
 358                         if (!tty_table[i] || tty_table[i]->count == 0)
 359                                 break;
 360                 put_fs_long(i <= NR_CONSOLES ? i : -1, (unsigned long *)arg);
 361                 return 0;
 362 
 363         /*
 364          * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num,
 365          * with num >= 1 (switches to vt 0, our console) are not allowed, just
 366          * to preserve sanity.
 367          */
 368         case VT_ACTIVATE:
 369                 if (arg == 0 || arg > NR_CONSOLES)
 370                         return -ENXIO;
 371                 change_console(arg - 1);
 372                 return 0;
 373 
 374         /*
 375          * wait until the specified VT has been activated
 376          */
 377         case VT_WAITACTIVE:
 378                 if (arg == 0 || arg > NR_CONSOLES)
 379                         return -ENXIO;
 380                 while (fg_console != arg - 1)
 381                 {
 382                         if (vt_waitactive() < 0)
 383                                 return -EINTR;
 384                 }
 385                 return 0;
 386 
 387         /*
 388          * If a vt is under process control, the kernel will not switch to it
 389          * immediately, but postpone the operation until the process calls this
 390          * ioctl, allowing the switch to complete.
 391          *
 392          * According to the X sources this is the behavior:
 393          *      0:      pending switch-from not OK
 394          *      1:      pending switch-from OK
 395          *      2:      completed switch-to OK
 396          */
 397         case VT_RELDISP:
 398                 if (vt_cons[console].vt_mode.mode != VT_PROCESS)
 399                         return -EINVAL;
 400 
 401                 /*
 402                  * Switching-from response
 403                  */
 404                 if (vt_cons[console].vt_newvt >= 0)
 405                 {
 406                         if (arg == 0)
 407                                 /*
 408                                  * Switch disallowed, so forget we were trying
 409                                  * to do it.
 410                                  */
 411                                 vt_cons[console].vt_newvt = -1;
 412 
 413                         else
 414                         {
 415                                 /*
 416                                  * The current vt has been released, so
 417                                  * complete the switch.
 418                                  */
 419                                 int newvt = vt_cons[console].vt_newvt;
 420                                 vt_cons[console].vt_newvt = -1;
 421                                 complete_change_console(newvt);
 422                         }
 423                 }
 424 
 425                 /*
 426                  * Switched-to response
 427                  */
 428                 else
 429                 {
 430                         /*
 431                          * If it's just an ACK, ignore it
 432                          */
 433                         if (arg != VT_ACKACQ)
 434                                 return -EINVAL;
 435                 }
 436 
 437                 return 0;
 438 
 439         default:
 440                 return -EINVAL;
 441         }
 442 }

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