root/kernel/chr_drv/vt.c

/* [previous][next][first][last][top][bottom][index][help] */

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 void
  66 kd_nosound(void)
     /* [previous][next][first][last][top][bottom][index][help] */
  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)
     /* [previous][next][first][last][top][bottom][index][help] */
  75 {
  76         if (count)
  77         {
  78                 /* enable counter 2 */
  79                 outb_p(inb_p(0x61)|3, 0x61);
  80                 /* set command for counter 2, 2 byte write */
  81                 outb_p(0xB6, 0x43);
  82                 /* select desired HZ */
  83                 outb_p(count & 0xff, 0x42);
  84                 outb((count >> 8) & 0xff, 0x42);
  85 
  86                 if (ticks)
  87                 {
  88                         timer_table[BEEP_TIMER].expires = jiffies + ticks;
  89                         timer_table[BEEP_TIMER].fn = kd_nosound;
  90                         timer_active |= (1 << BEEP_TIMER);
  91                 }
  92         }
  93 
  94         else
  95                 kd_nosound();
  96 
  97         return;
  98 }
  99 
 100 /*
 101  * We handle the console-specific ioctl's here.  We allow the
 102  * capability to modify any console, not just the fg_console. 
 103  */
 104 int vt_ioctl(struct tty_struct *tty, struct file * file,
     /* [previous][next][first][last][top][bottom][index][help] */
 105              unsigned int cmd, unsigned int arg)
 106 {
 107         int console, i;
 108         unsigned char ucval;
 109         struct kbd_struct * kbd;
 110 
 111         console = tty->line - 1;
 112 
 113         if (console < 0 || console >= NR_CONSOLES)
 114                 return -EINVAL;
 115 
 116         kbd = kbd_table + console;
 117         switch (cmd) {
 118         case KIOCSOUND:
 119                 kd_mksound((unsigned int)arg, 0);
 120                 return 0;
 121 
 122         case KDMKTONE:
 123         {
 124                 unsigned int ticks = HZ * ((arg >> 16) & 0xffff) / 1000;
 125 
 126                 /*
 127                  * Generate the tone for the appropriate number of ticks.
 128                  * If the time is zero, turn off sound ourselves.
 129                  */
 130                 kd_mksound(arg & 0xffff, ticks);
 131                 if (ticks == 0)
 132                         kd_nosound();
 133                 return 0;
 134         }
 135 
 136         case KDGKBTYPE:
 137                 /*
 138                  * this is naive.
 139                  */
 140                 verify_area((void *) arg, sizeof(unsigned char));
 141                 put_fs_byte(KB_101, (unsigned char *) arg);
 142                 return 0;
 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                 verify_area((void *) arg, sizeof(unsigned long));
 194                 put_fs_long(vt_cons[console].vc_mode, (unsigned long *) arg);
 195                 return 0;
 196 
 197         case KDMAPDISP:
 198         case KDUNMAPDISP:
 199                 /*
 200                  * these work like a combination of mmap and KDENABIO.
 201                  * this could be easily finished.
 202                  */
 203                 return -EINVAL;
 204 
 205         case KDSKBMODE:
 206                 if (arg == K_RAW) {
 207                         set_vc_kbd_flag(kbd, VC_RAW);
 208                 } else if (arg == K_XLATE) {
 209                         clr_vc_kbd_flag(kbd, VC_RAW);
 210                 }
 211                 else
 212                         return -EINVAL;
 213                 flush_input(tty);
 214                 return 0;
 215 
 216         case KDGKBMODE:
 217                 verify_area((void *) arg, sizeof(unsigned long));
 218                 ucval = vc_kbd_flag(kbd, VC_RAW);
 219                 put_fs_long(ucval ? K_RAW : K_XLATE, (unsigned long *) arg);
 220                 return 0;
 221 
 222         case KDGETLED:
 223                 verify_area((void *) arg, sizeof(unsigned char));
 224                 ucval = 0;
 225                 if (vc_kbd_flag(kbd, VC_SCROLLOCK))
 226                         ucval |= LED_SCR;
 227                 if (vc_kbd_flag(kbd, VC_NUMLOCK))
 228                         ucval |= LED_NUM;
 229                 if (vc_kbd_flag(kbd, VC_CAPSLOCK))
 230                         ucval |= LED_CAP;
 231                 put_fs_byte(ucval, (unsigned char *) arg);
 232                 return 0;
 233 
 234         case KDSETLED:
 235                 if (arg & ~7)
 236                         return -EINVAL;
 237                 if (arg & LED_SCR)
 238                         set_vc_kbd_flag(kbd, VC_SCROLLOCK);
 239                 else
 240                         clr_vc_kbd_flag(kbd, VC_SCROLLOCK);
 241                 if (arg & LED_NUM)
 242                         set_vc_kbd_flag(kbd, VC_NUMLOCK);
 243                 else
 244                         clr_vc_kbd_flag(kbd, VC_NUMLOCK);
 245                 if (arg & LED_CAP)
 246                         set_vc_kbd_flag(kbd, VC_CAPSLOCK);
 247                 else
 248                         clr_vc_kbd_flag(kbd, VC_CAPSLOCK);
 249                 set_leds();
 250                 return 0;
 251 
 252         case VT_SETMODE:
 253         {
 254                 struct vt_mode *vtmode = (struct vt_mode *)arg;
 255                 char mode;
 256 
 257                 verify_area((void *)vtmode, sizeof(struct vt_mode));
 258                 mode = get_fs_byte(&vtmode->mode);
 259                 if (mode != VT_AUTO && mode != VT_PROCESS)
 260                         return -EINVAL;
 261                 vt_cons[console].vt_mode.mode = mode;
 262                 vt_cons[console].vt_mode.waitv = get_fs_byte(&vtmode->waitv);
 263                 vt_cons[console].vt_mode.relsig = get_fs_word(&vtmode->relsig);
 264                 vt_cons[console].vt_mode.acqsig = get_fs_word(&vtmode->acqsig);
 265                 /* the frsig is ignored, so we set it to 0 */
 266                 vt_cons[console].vt_mode.frsig = 0;
 267                 vt_cons[console].vt_pid = current->pid;
 268                 vt_cons[console].vt_newvt = 0;
 269                 return 0;
 270         }
 271 
 272         case VT_GETMODE:
 273         {
 274                 struct vt_mode *vtmode = (struct vt_mode *)arg;
 275 
 276                 verify_area((void *)arg, sizeof(struct vt_mode));
 277                 put_fs_byte(vt_cons[console].vt_mode.mode, &vtmode->mode);
 278                 put_fs_byte(vt_cons[console].vt_mode.waitv, &vtmode->waitv);
 279                 put_fs_word(vt_cons[console].vt_mode.relsig, &vtmode->relsig);
 280                 put_fs_word(vt_cons[console].vt_mode.acqsig, &vtmode->acqsig);
 281                 put_fs_word(vt_cons[console].vt_mode.frsig, &vtmode->frsig);
 282                 return 0;
 283         }
 284 
 285         /*
 286          * Returns global vt state. Note that VT 0 is always open, since
 287          * it's an alias for the current VT, and people can't use it here.
 288          */
 289         case VT_GETSTATE:
 290         {
 291                 struct vt_stat *vtstat = (struct vt_stat *)arg;
 292                 unsigned short state, mask;
 293 
 294                 verify_area((void *)vtstat, sizeof(struct vt_stat));
 295                 put_fs_word(fg_console + 1, &vtstat->v_active);
 296                 state = 1;      /* /dev/tty0 is always open */
 297                 for (i = 1, mask = 2; i <= NR_CONSOLES; ++i, mask <<= 1)
 298                         if (tty_table[i] && tty_table[i]->count > 0)
 299                                 state |= mask;
 300                 put_fs_word(state, &vtstat->v_state);
 301                 return 0;
 302         }
 303 
 304         /*
 305          * Returns the first available (non-opened) console.
 306          */
 307         case VT_OPENQRY:
 308                 verify_area((void *) arg, sizeof(long));
 309                 for (i = 1; i <= NR_CONSOLES; ++i)
 310                         if (!tty_table[i] || tty_table[i]->count == 0)
 311                                 break;
 312                 put_fs_long(i <= NR_CONSOLES ? i : -1, (unsigned long *)arg);
 313                 return 0;
 314 
 315         /*
 316          * ioctl(fd, VT_ACTIVATE, num) will cause us to switch to vt # num,
 317          * with num >= 1 (switches to vt 0, our console) are not allowed, just
 318          * to preserve sanity.
 319          */
 320         case VT_ACTIVATE:
 321                 if (arg == 0 || arg > NR_CONSOLES)
 322                         return -ENXIO;
 323                 change_console(arg - 1);
 324                 return 0;
 325 
 326         /*
 327          * wait until the specified VT has been activated
 328          */
 329         case VT_WAITACTIVE:
 330                 if (arg == 0 || arg > NR_CONSOLES)
 331                         return -ENXIO;
 332                 while (fg_console != arg - 1)
 333                 {
 334                         if (vt_waitactive() < 0)
 335                                 return -EINTR;
 336                 }
 337                 return 0;
 338 
 339         /*
 340          * If a vt is under process control, the kernel will not switch to it
 341          * immediately, but postpone the operation until the process calls this
 342          * ioctl, allowing the switch to complete.
 343          *
 344          * According to the X sources this is the behavior:
 345          *      0:      pending switch-from not OK
 346          *      1:      pending switch-from OK
 347          *      2:      completed switch-to OK
 348          */
 349         case VT_RELDISP:
 350                 if (vt_cons[console].vt_mode.mode != VT_PROCESS)
 351                         return -EINVAL;
 352 
 353                 /*
 354                  * Switching-from response
 355                  */
 356                 if (vt_cons[console].vt_newvt >= 0)
 357                 {
 358                         if (arg == 0)
 359                                 /*
 360                                  * Switch disallowed, so forget we were trying
 361                                  * to do it.
 362                                  */
 363                                 vt_cons[console].vt_newvt = -1;
 364 
 365                         else
 366                         {
 367                                 /*
 368                                  * The current vt has been released, so
 369                                  * complete the switch.
 370                                  */
 371                                 int newvt = vt_cons[console].vt_newvt;
 372                                 vt_cons[console].vt_newvt = -1;
 373                                 complete_change_console(newvt);
 374                         }
 375                 }
 376 
 377                 /*
 378                  * Switched-to response
 379                  */
 380                 else
 381                 {
 382                         /*
 383                          * If it's just an ACK, ignore it
 384                          */
 385                         if (arg != VT_ACKACQ)
 386                                 return -EINVAL;
 387                 }
 388 
 389                 return 0;
 390 
 391         default:
 392                 return -EINVAL;
 393         }
 394 }

/* [previous][next][first][last][top][bottom][index][help] */