drivers/char/keyboard.c

/* */
This source file includes following definitions.
kb_wait
send_cmd
keyboard_interrupt
put_queue
puts_queue
applkey
enter
caps_toggle
caps_on
show_ptregs
hold
num
lastcons
send_intr
scrll_forw
scrll_back
boot_it
compose
do_spec
do_self
do_dead
handle_diacr
do_cons
do_fn
do_pad
do_cur
do_shift
compute_shiftstate
do_meta
do_ascii
do_lock
send_data
kbd_bh
hard_reset_now
kbd_init
   1 /*
   2  * linux/kernel/chr_drv/keyboard.c
   3  *
   4  * Keyboard driver for Linux v0.96 using Latin-1.
   5  *
   6  * Written for linux by Johan Myreen as a translation from
   7  * the assembly version by Linus (with diacriticals added)
   8  *
   9  * Some additional features added by Christoph Niemann (ChN), March 1993
  10  * Loadable keymaps by Risto Kankkunen, May 1993
  11  * Diacriticals redone & other small changes, aeb@cwi.nl, June 1993
  12  */
  13 
  14 #define KEYBOARD_IRQ 1
  15 
  16 #include <linux/sched.h>
  17 #include <linux/tty.h>
  18 #include <linux/mm.h>
  19 #include <linux/ptrace.h>
  20 #include <linux/keyboard.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/config.h>
  23 #include <linux/signal.h>
  24 #include <linux/string.h>
  25 
  26 #include <asm/bitops.h>
  27 
  28 #include "diacr.h"
  29 
  30 #define SIZE(x) (sizeof(x)/sizeof((x)[0]))
  31 
  32 #ifndef KBD_DEFFLAGS
  33 
  34 #ifdef CONFIG_KBD_META
  35 #define KBD_META (1 << VC_META)
  36 #else
  37 #define KBD_META 0
  38 #endif
  39 
  40 #ifdef CONFIG_KBD_NUML
  41 #define KBD_NUML (1 << VC_NUMLOCK)
  42 #else
  43 #define KBD_NUML 0
  44 #endif
  45 
  46 #define KBD_DEFFLAGS (KBD_NUML | (1 << VC_REPEAT) | KBD_META)
  47 #endif
  48 
  49 /*
  50  * The default IO slowdown is doing 'inb()'s from 0x61, which should be
  51  * safe. But as that is the keyboard controller chip address, we do our
  52  * slowdowns here by doing short jumps: the keyboard controller should
  53  * be able to keep up
  54  */
  55 #define REALLY_SLOW_IO
  56 #define SLOW_IO_BY_JUMPING
  57 #include <asm/io.h>
  58 #include <asm/system.h>
  59 
  60 extern void do_keyboard_interrupt(void);
  61 extern void ctrl_alt_del(void);
  62 extern void change_console(unsigned int new_console);
  63 extern void scrollback(int);
  64 extern void scrollfront(int);
  65 
  66 #define fake_keyboard_interrupt() \
  67 __asm__ __volatile__("int $0x21")
  68 
  69 unsigned char kbd_read_mask = 0x01;     /* modified by psaux.c */
  70 
  71 /*
  72  * global state includes the following, and various static variables
  73  * in this module: prev_scancode, shift_state, diacr, npadch,
  74  *   dead_key_next, last_console
  75  */
  76 
  77 /* shift state counters.. */
  78 static unsigned char k_down[NR_SHIFT] = {0, };
  79 /* keyboard key bitmap */
  80 static unsigned long key_down[8] = { 0, };
  81 
  82 static int want_console = -1;
  83 static int last_console = 0;            /* last used VC */
  84 static int dead_key_next = 0;
  85 static int shift_state = 0;
  86 static int npadch = -1;                 /* -1 or number assembled on pad */
  87 static unsigned char diacr = 0;
  88 static char rep = 0;                    /* flag telling character repeat */
  89 struct kbd_struct kbd_table[NR_CONSOLES];
  90 static struct kbd_struct * kbd = kbd_table;
  91 static struct tty_struct * tty = NULL;
  92 
  93 static volatile unsigned char acknowledge = 0;
  94 static volatile unsigned char resend = 0;
  95 
  96 typedef void (*k_hand)(unsigned char value, char up_flag);
  97 
  98 static void do_self(unsigned char value, char up_flag);
  99 static void do_fn(unsigned char value, char up_flag);
 100 static void do_spec(unsigned char value, char up_flag);
 101 static void do_pad(unsigned char value, char up_flag);
 102 static void do_dead(unsigned char value, char up_flag);
 103 static void do_cons(unsigned char value, char up_flag);
 104 static void do_cur(unsigned char value, char up_flag);
 105 static void do_shift(unsigned char value, char up_flag);
 106 static void do_meta(unsigned char value, char up_flag);
 107 static void do_ascii(unsigned char value, char up_flag);
 108 static void do_lock(unsigned char value, char up_flag);
 109 
 110 static k_hand key_handler[] = {
 111         do_self, do_fn, do_spec, do_pad, do_dead, do_cons, do_cur, do_shift,
 112         do_meta, do_ascii, do_lock
 113 };
 114 
 115 /* maximum values each key_handler can handle */
 116 const int max_vals[] = {
 117         255, NR_FUNC - 1, 14, 17, 4, 255, 3, NR_SHIFT,
 118         255, 9, 3
 119 };
 120 
 121 const int NR_TYPES = SIZE(max_vals);
 122 
 123 static void put_queue(int);
 124 static unsigned char handle_diacr(unsigned char);
 125 
 126 /* pt_regs - set by keyboard_interrupt(), used by show_ptregs() */
 127 static struct pt_regs * pt_regs;
 128 
 129 static inline void kb_wait(void)
     /*  */
 130 {
 131         int i;
 132 
 133         for (i=0; i<0x10000; i++)
 134                 if ((inb_p(0x64) & 0x02) == 0)
 135                         break;
 136 }
 137 
 138 static inline void send_cmd(unsigned char c)
     /*  */
 139 {
 140         kb_wait();
 141         outb(c,0x64);
 142 }
 143 
 144 /*
 145  * Translation of escaped scancodes to keysyms.
 146  * This should be user-settable.
 147  */
 148 #define E0_BASE 96
 149 
 150 #define E0_KPENTER (E0_BASE+0)
 151 #define E0_RCTRL   (E0_BASE+1)
 152 #define E0_KPSLASH (E0_BASE+2)
 153 #define E0_PRSCR   (E0_BASE+3)
 154 #define E0_RALT    (E0_BASE+4)
 155 #define E0_BREAK   (E0_BASE+5)  /* (control-pause) */
 156 #define E0_HOME    (E0_BASE+6)
 157 #define E0_UP      (E0_BASE+7)
 158 #define E0_PGUP    (E0_BASE+8)
 159 #define E0_LEFT    (E0_BASE+9)
 160 #define E0_RIGHT   (E0_BASE+10)
 161 #define E0_END     (E0_BASE+11)
 162 #define E0_DOWN    (E0_BASE+12)
 163 #define E0_PGDN    (E0_BASE+13)
 164 #define E0_INS     (E0_BASE+14)
 165 #define E0_DEL     (E0_BASE+15)
 166 /* BTC */
 167 #define E0_MACRO   (E0_BASE+16)
 168 /* LK450 */
 169 #define E0_F13     (E0_BASE+17)
 170 #define E0_F14     (E0_BASE+18)
 171 #define E0_HELP    (E0_BASE+19)
 172 #define E0_DO      (E0_BASE+20)
 173 #define E0_F17     (E0_BASE+21)
 174 #define E0_KPMINPLUS (E0_BASE+22)
 175 
 176 #define E1_PAUSE   (E0_BASE+23)
 177 
 178 static unsigned char e0_keys[128] = {
 179   0, 0, 0, 0, 0, 0, 0, 0,                             /* 0x00-0x07 */
 180   0, 0, 0, 0, 0, 0, 0, 0,                             /* 0x08-0x0f */
 181   0, 0, 0, 0, 0, 0, 0, 0,                             /* 0x10-0x17 */
 182   0, 0, 0, 0, E0_KPENTER, E0_RCTRL, 0, 0,             /* 0x18-0x1f */
 183   0, 0, 0, 0, 0, 0, 0, 0,                             /* 0x20-0x27 */
 184   0, 0, 0, 0, 0, 0, 0, 0,                             /* 0x28-0x2f */
 185   0, 0, 0, 0, 0, E0_KPSLASH, 0, E0_PRSCR,             /* 0x30-0x37 */
 186   E0_RALT, 0, 0, 0, 0, E0_F13, E0_F14, E0_HELP,       /* 0x38-0x3f */
 187   E0_DO, E0_F17, 0, 0, 0, 0, E0_BREAK, E0_HOME,       /* 0x40-0x47 */
 188   E0_UP, E0_PGUP, 0, E0_LEFT, 0, E0_RIGHT, E0_KPMINPLUS, E0_END,/* 0x48-0x4f */
 189   E0_DOWN, E0_PGDN, E0_INS, E0_DEL, 0, 0, 0, 0,       /* 0x50-0x57 */
 190   0, 0, 0, 0, 0, 0, 0, 0,                             /* 0x58-0x5f */
 191   0, 0, 0, 0, 0, 0, 0, 0,                             /* 0x60-0x67 */
 192   0, 0, 0, 0, 0, 0, 0, E0_MACRO,                      /* 0x68-0x6f */
 193   0, 0, 0, 0, 0, 0, 0, 0,                             /* 0x70-0x77 */
 194   0, 0, 0, 0, 0, 0, 0, 0                              /* 0x78-0x7f */
 195 };
 196 
 197 static void keyboard_interrupt(int int_pt_regs)
     /*  */
 198 {
 199         unsigned char scancode;
 200         static unsigned int prev_scancode = 0;   /* remember E0, E1 */
 201         char up_flag;                            /* 0 or 0200 */
 202         char raw_mode;
 203 
 204         pt_regs = (struct pt_regs *) int_pt_regs;
 205         send_cmd(0xAD);         /* disable keyboard */
 206         kb_wait();
 207         if ((inb_p(0x64) & kbd_read_mask) != 0x01)
 208                 goto end_kbd_intr;
 209         scancode = inb(0x60);
 210         mark_bh(KEYBOARD_BH);
 211         if (scancode == 0xfa) {
 212                 acknowledge = 1;
 213                 goto end_kbd_intr;
 214         } else if (scancode == 0xfe) {
 215                 resend = 1;
 216                 goto end_kbd_intr;
 217         }
 218         tty = TTY_TABLE(0);
 219         kbd = kbd_table + fg_console;
 220         if ((raw_mode = vc_kbd_flag(kbd,VC_RAW))) {
 221                 put_queue(scancode);
 222                 /* we do not return yet, because we want to maintain
 223                    the key_down array, so that we have the correct
 224                    values when finishing RAW mode or when changing VT's */
 225         }
 226         if (scancode == 0xe0 || scancode == 0xe1) {
 227                 prev_scancode = scancode;
 228                 goto end_kbd_intr;
 229         }
 230 
 231         /*
 232          *  Convert scancode to keysym, using prev_scancode.
 233          */
 234         up_flag = (scancode & 0200);
 235         scancode &= 0x7f;
 236   
 237         if (prev_scancode) {
 238           /*
 239            * usually it will be 0xe0, but a Pause key generates
 240            * e1 1d 45 e1 9d c5 when pressed, and nothing when released
 241            */
 242           if (prev_scancode != 0xe0) {
 243               if (prev_scancode == 0xe1 && scancode == 0x1d) {
 244                   prev_scancode = 0x100;
 245                   goto end_kbd_intr;
 246               } else if (prev_scancode == 0x100 && scancode == 0x45) {
 247                   scancode = E1_PAUSE;
 248                   prev_scancode = 0;
 249               } else {
 250                   printk("keyboard: unknown e1 escape sequence\n");
 251                   prev_scancode = 0;
 252                   goto end_kbd_intr;
 253               }
 254           } else {
 255               prev_scancode = 0;
 256               /*
 257                *  The keyboard maintains its own internal caps lock and
 258                *  num lock statuses. In caps lock mode E0 AA precedes make
 259                *  code and E0 2A follows break code. In num lock mode,
 260                *  E0 2A precedes make code and E0 AA follows break code.
 261                *  We do our own book-keeping, so we will just ignore these.
 262                */
 263               /*
 264                *  For my keyboard there is no caps lock mode, but there are
 265                *  both Shift-L and Shift-R modes. The former mode generates
 266                *  E0 2A / E0 AA pairs, the latter E0 B6 / E0 36 pairs.
 267                *  So, we should also ignore the latter. - aeb@cwi.nl
 268                */
 269               if (scancode == 0x2a || scancode == 0x36)
 270                 goto end_kbd_intr;
 271 
 272               if (e0_keys[scancode])
 273                 scancode = e0_keys[scancode];
 274               else if (!raw_mode) {
 275                   printk("keyboard: unknown scancode e0 %02x\n", scancode);
 276                   goto end_kbd_intr;
 277               }
 278           }
 279         } else if (scancode >= E0_BASE && !raw_mode) {
 280           printk("keyboard: scancode (%02x) not in range 00 - %2x\n",
 281                  scancode, E0_BASE - 1);
 282           goto end_kbd_intr;
 283         }
 284   
 285         /*
 286          * At this point the variable `scancode' contains the keysym.
 287          * We keep track of the up/down status of the key, and
 288          * return the keysym if in MEDIUMRAW mode.
 289          * (Note: earlier kernels had a bug and did not pass the up/down
 290          * bit to applications.)
 291          */
 292 
 293         if (up_flag) {
 294                 clear_bit(scancode, key_down);
 295                 rep = 0;
 296         } else
 297                 rep = set_bit(scancode, key_down);
 298   
 299         if (raw_mode)
 300                 goto end_kbd_intr;
 301 
 302         if (vc_kbd_flag(kbd, VC_MEDIUMRAW)) {
 303                 put_queue(scancode + up_flag);
 304                 goto end_kbd_intr;
 305         }
 306   
 307         /*
 308          * Small change in philosophy: earlier we defined repetition by
 309          *       rep = scancode == prev_keysym;
 310          *       prev_keysym = scancode;
 311          * but now by the fact that the depressed key was down already.
 312          * Does this ever make a difference?
 313          */
 314 
 315         /*
 316          *  Repeat a key only if the input buffers are empty or the
 317          *  characters get echoed locally. This makes key repeat usable
 318          *  with slow applications and under heavy loads.
 319          */
 320         if (!rep || 
 321             (vc_kbd_flag(kbd,VC_REPEAT) && tty &&
 322              (L_ECHO(tty) || (EMPTY(&tty->secondary) && EMPTY(&tty->read_q)))))
 323         {
 324                 u_short key_code;
 325 
 326                 key_code = key_map[shift_state][scancode];
 327                 (*key_handler[key_code >> 8])(key_code & 0xff, up_flag);
 328         }
 329 
 330 end_kbd_intr:
 331         send_cmd(0xAE);         /* enable keyboard */
 332 }
 333 
 334 static void put_queue(int ch)
     /*  */
 335 {
 336         struct tty_queue *qp;
 337 
 338         wake_up(&keypress_wait);
 339         if (!tty)
 340                 return;
 341         qp = &tty->read_q;
 342 
 343         if (LEFT(qp)) {
 344                 qp->buf[qp->head] = ch;
 345                 INC(qp->head);
 346                 wake_up_interruptible(&qp->proc_list);
 347         }
 348 }
 349 
 350 static void puts_queue(char *cp)
     /*  */
 351 {
 352         struct tty_queue *qp;
 353         char ch;
 354 
 355         /* why interruptible here, plain wake_up above? */
 356         wake_up_interruptible(&keypress_wait);
 357         if (!tty)
 358                 return;
 359         qp = &tty->read_q;
 360 
 361         while ((ch = *(cp++)) != 0) {
 362                 if (LEFT(qp)) {
 363                         qp->buf[qp->head] = ch;
 364                         INC(qp->head);
 365                 }
 366         }
 367         wake_up_interruptible(&qp->proc_list);
 368 }
 369 
 370 static void applkey(int key, char mode)
     /*  */
 371 {
 372         static char buf[] = { 0x1b, 'O', 0x00, 0x00 };
 373 
 374         buf[1] = (mode ? 'O' : '[');
 375         buf[2] = key;
 376         puts_queue(buf);
 377 }
 378 
 379 static void enter(void)
     /*  */
 380 {
 381         put_queue(13);
 382         if (vc_kbd_flag(kbd,VC_CRLF))
 383                 put_queue(10);
 384 }
 385 
 386 static void caps_toggle(void)
     /*  */
 387 {
 388         if (rep)
 389                 return;
 390         chg_vc_kbd_flag(kbd,VC_CAPSLOCK);
 391 }
 392 
 393 static void caps_on(void)
     /*  */
 394 {
 395         if (rep)
 396                 return;
 397         set_vc_kbd_flag(kbd,VC_CAPSLOCK);
 398 }
 399 
 400 static void show_ptregs(void)
     /*  */
 401 {
 402         if (!pt_regs)
 403                 return;
 404         printk("\n");
 405         printk("EIP: %04x:%08lx",0xffff & pt_regs->cs,pt_regs->eip);
 406         if (pt_regs->cs & 3)
 407                 printk(" ESP: %04x:%08lx",0xffff & pt_regs->ss,pt_regs->esp);
 408         printk(" EFLAGS: %08lx\n",pt_regs->eflags);
 409         printk("EAX: %08lx EBX: %08lx ECX: %08lx EDX: %08lx\n",
 410                 pt_regs->orig_eax,pt_regs->ebx,pt_regs->ecx,pt_regs->edx);
 411         printk("ESI: %08lx EDI: %08lx EBP: %08lx",
 412                 pt_regs->esi, pt_regs->edi, pt_regs->ebp);
 413         printk(" DS: %04x ES: %04x FS: %04x GS: %04x\n",
 414                 0xffff & pt_regs->ds,0xffff & pt_regs->es,
 415                 0xffff & pt_regs->fs,0xffff & pt_regs->gs);
 416 }
 417 
 418 static void hold(void)
     /*  */
 419 {
 420         if (rep || !tty)
 421                 return;
 422         if (vc_kbd_flag(kbd, VC_SCROLLOCK))
 423                 /* pressing srcoll lock 2nd time sends ^Q, ChN */
 424                 put_queue(START_CHAR(tty));
 425         else
 426                 /* pressing scroll lock 1st time sends ^S, ChN */
 427                 put_queue(STOP_CHAR(tty));
 428         chg_vc_kbd_flag(kbd,VC_SCROLLOCK);
 429 }
 430 
 431 static void num(void)
     /*  */
 432 {
 433 #if 0
 434         if (k_down[KG_CTRL]) {
 435                 /* pause key pressed, sends E1 1D 45, ChN */
 436                 chg_vc_kbd_flag(kbd,VC_PAUSE);
 437                 return;
 438         }
 439 #endif
 440         if (vc_kbd_flag(kbd,VC_APPLIC)) {
 441                 applkey('P', 1);
 442                 return;
 443         }
 444         if (!rep)       /* no autorepeat for numlock, ChN */
 445                 chg_vc_kbd_flag(kbd,VC_NUMLOCK);
 446 }
 447 
 448 static void lastcons(void)
     /*  */
 449 {
 450         /* pressing alt-printscreen switches to the last used console, ChN */
 451         want_console = last_console;
 452 }
 453 
 454 static void send_intr(void)
     /*  */
 455 {
 456         if (tty)
 457                 put_queue(INTR_CHAR(tty));
 458 }
 459 
 460 static void scrll_forw(void)
     /*  */
 461 {
 462         scrollfront(0);
 463 }
 464 
 465 static void scrll_back(void)
     /*  */
 466 {
 467         scrollback(0);
 468 }
 469 
 470 static void boot_it(void)
     /*  */
 471 {
 472         ctrl_alt_del();
 473 }
 474 
 475 static void compose(void)
     /*  */
 476 {
 477         dead_key_next = 1;
 478 }
 479 
 480 static void do_spec(unsigned char value, char up_flag)
     /*  */
 481 {
 482         typedef void (*fnp)(void);
 483         fnp fn_table[] = {
 484                 NULL,           enter,          show_ptregs,    show_mem,
 485                 show_state,     send_intr,      lastcons,       caps_toggle,
 486                 num,            hold,           scrll_forw,     scrll_back,
 487                 boot_it,        caps_on,        compose
 488         };
 489 
 490         if (up_flag)
 491                 return;
 492         if (value >= SIZE(fn_table))
 493                 return;
 494         if (!fn_table[value])
 495                 return;
 496         fn_table[value]();
 497 }
 498   
 499 static void do_self(unsigned char value, char up_flag)
     /*  */
 500 {
 501         if (up_flag)
 502                 return;         /* no action, if this is a key release */
 503 
 504         if (diacr)
 505                 value = handle_diacr(value);
 506 
 507         if (dead_key_next) {
 508                 dead_key_next = 0;
 509                 diacr = value;
 510                 return;
 511         }
 512 
 513         /* kludge... but works for ISO 8859-1 */
 514         if (vc_kbd_flag(kbd,VC_CAPSLOCK))
 515                 if ((value >= 'a' && value <= 'z')
 516                     || (value >= 224 && value <= 254)) {
 517                         value -= 32;
 518                 }
 519 
 520         put_queue(value);
 521 }
 522 
 523 #define A_GRAVE  '`'
 524 #define A_ACUTE  '\''
 525 #define A_CFLEX  '^'
 526 #define A_TILDE  '~'
 527 #define A_DIAER  '"'
 528 static unsigned char ret_diacr[] =
 529         {A_GRAVE, A_ACUTE, A_CFLEX, A_TILDE, A_DIAER };
 530 
 531 /* If a dead key pressed twice, output a character corresponding to it, */
 532 /* otherwise just remember the dead key.                                */
 533 
 534 static void do_dead(unsigned char value, char up_flag)
     /*  */
 535 {
 536         if (up_flag)
 537                 return;
 538 
 539         value = ret_diacr[value];
 540         if (diacr == value) {   /* pressed twice */
 541                 diacr = 0;
 542                 put_queue(value);
 543                 return;
 544         }
 545         diacr = value;
 546 }
 547 
 548 
 549 /* If space is pressed, return the character corresponding the pending  */
 550 /* dead key, otherwise try to combine the two.                          */
 551 
 552 unsigned char handle_diacr(unsigned char ch)
     /*  */
 553 {
 554         int d = diacr;
 555         int i;
 556 
 557         diacr = 0;
 558         if (ch == ' ')
 559                 return d;
 560 
 561         for (i = 0; i < accent_table_size; i++)
 562           if(accent_table[i].diacr == d && accent_table[i].base == ch)
 563             return accent_table[i].result;
 564 
 565         put_queue(d);
 566         return ch;
 567 }
 568 
 569 static void do_cons(unsigned char value, char up_flag)
     /*  */
 570 {
 571         if (up_flag)
 572                 return;
 573         want_console = value;
 574 }
 575 
 576 static void do_fn(unsigned char value, char up_flag)
     /*  */
 577 {
 578         if (up_flag)
 579                 return;
 580         if (value < SIZE(func_table))
 581                 puts_queue(func_table[value]);
 582         else
 583                 printk("do_fn called with value=%d\n", value);
 584 }
 585 
 586 static void do_pad(unsigned char value, char up_flag)
     /*  */
 587 {
 588         static char *pad_chars = "0123456789+-*/\015,.?";
 589         static char *app_map = "pqrstuvwxylSRQMnn?";
 590 
 591         if (up_flag)
 592                 return;         /* no action, if this is a key release */
 593 
 594         /* kludge... shift forces cursor/number keys */
 595         if (vc_kbd_flag(kbd,VC_APPLIC) && !k_down[KG_SHIFT]) {
 596                 applkey(app_map[value], 1);
 597                 return;
 598         }
 599 
 600         if (!vc_kbd_flag(kbd,VC_NUMLOCK))
 601                 switch (value) {
 602                         case KVAL(K_PCOMMA):
 603                         case KVAL(K_PDOT):
 604                                 do_fn(KVAL(K_REMOVE), 0);
 605                                 return;
 606                         case KVAL(K_P0):
 607                                 do_fn(KVAL(K_INSERT), 0);
 608                                 return;
 609                         case KVAL(K_P1):
 610                                 do_fn(KVAL(K_SELECT), 0);
 611                                 return;
 612                         case KVAL(K_P2):
 613                                 do_cur(KVAL(K_DOWN), 0);
 614                                 return;
 615                         case KVAL(K_P3):
 616                                 do_fn(KVAL(K_PGDN), 0);
 617                                 return;
 618                         case KVAL(K_P4):
 619                                 do_cur(KVAL(K_LEFT), 0);
 620                                 return;
 621                         case KVAL(K_P6):
 622                                 do_cur(KVAL(K_RIGHT), 0);
 623                                 return;
 624                         case KVAL(K_P7):
 625                                 do_fn(KVAL(K_FIND), 0);
 626                                 return;
 627                         case KVAL(K_P8):
 628                                 do_cur(KVAL(K_UP), 0);
 629                                 return;
 630                         case KVAL(K_P9):
 631                                 do_fn(KVAL(K_PGUP), 0);
 632                                 return;
 633                         case KVAL(K_P5):
 634                                 applkey('G', vc_kbd_flag(kbd, VC_APPLIC));
 635                                 return;
 636                 }
 637 
 638         put_queue(pad_chars[value]);
 639         if (value == KVAL(K_PENTER) && vc_kbd_flag(kbd, VC_CRLF))
 640                 put_queue(10);
 641 }
 642 
 643 static void do_cur(unsigned char value, char up_flag)
     /*  */
 644 {
 645         static char *cur_chars = "BDCA";
 646         if (up_flag)
 647                 return;
 648 
 649         applkey(cur_chars[value], vc_kbd_flag(kbd,VC_CKMODE));
 650 }
 651 
 652 static void do_shift(unsigned char value, char up_flag)
     /*  */
 653 {
 654         int old_state = shift_state;
 655 
 656         if (rep)
 657                 return;
 658 
 659         /* kludge... */
 660         if (value == KVAL(K_CAPSSHIFT)) {
 661                 value = KVAL(K_SHIFT);
 662                 clr_vc_kbd_flag(kbd, VC_CAPSLOCK);
 663         }
 664 
 665         if (up_flag) {
 666                 /* handle the case that two shift or control
 667                    keys are depressed simultaneously */
 668                 if (k_down[value])
 669                         k_down[value]--;
 670         } else
 671                 k_down[value]++;
 672 
 673         if (k_down[value])
 674                 shift_state |= (1 << value);
 675         else
 676                 shift_state &= ~ (1 << value);
 677 
 678         /* kludge */
 679         if (up_flag && shift_state != old_state && npadch != -1) {
 680                 put_queue(npadch);
 681                 npadch = -1;
 682         }
 683 }
 684 
 685 /* called after returning from RAW mode or when changing consoles -
 686    recompute k_down[] and shift_state from key_down[] */
 687 void compute_shiftstate(void)
     /*  */
 688 {
 689         int i, j, k, sym, val;
 690 
 691         shift_state = 0;
 692         for(i=0; i < SIZE(k_down); i++)
 693           k_down[i] = 0;
 694 
 695         for(i=0; i < SIZE(key_down); i++)
 696           if(key_down[i]) {     /* skip this word if not a single bit on */
 697             k = (i<<5);
 698             for(j=0; j<32; j++,k++)
 699               if(test_bit(k, key_down)) {
 700                 sym = key_map[0][k];
 701                 if(KTYP(sym) == KT_SHIFT) {
 702                   val = KVAL(sym);
 703                   k_down[val]++;
 704                   shift_state |= (1<<val);
 705                 }
 706               }
 707           }
 708 }
 709 
 710 static void do_meta(unsigned char value, char up_flag)
     /*  */
 711 {
 712         if (up_flag)
 713                 return;
 714 
 715         if (vc_kbd_flag(kbd, VC_META)) {
 716                 put_queue('\033');
 717                 put_queue(value);
 718         } else
 719                 put_queue(value | 0x80);
 720 }
 721 
 722 static void do_ascii(unsigned char value, char up_flag)
     /*  */
 723 {
 724         if (up_flag)
 725                 return;
 726 
 727         if (npadch == -1)
 728                 npadch = value;
 729         else
 730                 npadch = (npadch * 10 + value) % 1000;
 731 }
 732 
 733 /* done stupidly to avoid coding in any dependencies of
 734 lock values, shift values and kbd flags bit positions */
 735 static void do_lock(unsigned char value, char up_flag)
     /*  */
 736 {
 737         if (up_flag || rep)
 738                 return;
 739         switch (value) {
 740                 case KVAL(K_SHIFTLOCK):
 741                         chg_vc_kbd_flag(kbd, VC_SHIFTLOCK);
 742                         do_shift(KG_SHIFT, !vc_kbd_flag(kbd, VC_SHIFTLOCK));
 743                         break;
 744                 case KVAL(K_CTRLLOCK):
 745                         chg_vc_kbd_flag(kbd, VC_CTRLLOCK);
 746                         do_shift(KG_CTRL, !vc_kbd_flag(kbd, VC_CTRLLOCK));
 747                         break;
 748                 case KVAL(K_ALTLOCK):
 749                         chg_vc_kbd_flag(kbd, VC_ALTLOCK);
 750                         do_shift(KG_ALT, !vc_kbd_flag(kbd, VC_ALTLOCK));
 751                         break;
 752                 case KVAL(K_ALTGRLOCK):
 753                         chg_vc_kbd_flag(kbd, VC_ALTGRLOCK);
 754                         do_shift(KG_ALTGR, !vc_kbd_flag(kbd, VC_ALTGRLOCK));
 755                         break;
 756         }
 757 }
 758 
 759 /*
 760  * send_data sends a character to the keyboard and waits
 761  * for a acknowledge, possibly retrying if asked to. Returns
 762  * the success status.
 763  */
 764 static int send_data(unsigned char data)
     /*  */
 765 {
 766         int retries = 3;
 767         int i;
 768 
 769         do {
 770                 kb_wait();
 771                 acknowledge = 0;
 772                 resend = 0;
 773                 outb_p(data, 0x60);
 774                 for(i=0; i<0x20000; i++) {
 775                         inb_p(0x64);            /* just as a delay */
 776                         if (acknowledge)
 777                                 return 1;
 778                         if (resend)
 779                                 break;
 780                 }
 781                 if (!resend)
 782                         return 0;
 783         } while (retries-- > 0);
 784         return 0;
 785 }
 786 
 787 /*
 788  * This routine is the bottom half of the keyboard interrupt
 789  * routine, and runs with all interrupts enabled. It does
 790  * console changing, led setting and copy_to_cooked, which can
 791  * take a reasonably long time.
 792  *
 793  * Aside from timing (which isn't really that important for
 794  * keyboard interrupts as they happen often), using the software
 795  * interrupt routines for this thing allows us to easily mask
 796  * this when we don't want any of the above to happen. Not yet
 797  * used, but this allows for easy and efficient race-condition
 798  * prevention later on.
 799  */
 800 static void kbd_bh(void * unused)
     /*  */
 801 {
 802         static unsigned char old_leds = 0xff;
 803         unsigned char leds = kbd_table[fg_console].flags & LED_MASK;
 804 
 805         if (leds != old_leds) {
 806                 old_leds = leds;
 807                 if (!send_data(0xed) || !send_data(leds))
 808                         send_data(0xf4);        /* re-enable kbd if any errors */
 809         }
 810         if (want_console >= 0) {
 811                 if (want_console != fg_console) {
 812                         last_console = fg_console;
 813                         change_console(want_console);
 814                 }
 815                 want_console = -1;
 816         }
 817         do_keyboard_interrupt();
 818         cli();
 819         if ((inb_p(0x64) & kbd_read_mask) == 0x01)
 820                 fake_keyboard_interrupt();
 821         sti();
 822 }
 823 
 824 long no_idt[2] = {0, 0};
 825 
 826 /*
 827  * This routine reboots the machine by asking the keyboard
 828  * controller to pulse the reset-line low. We try that for a while,
 829  * and if it doesn't work, we do some other stupid things.
 830  */
 831 void hard_reset_now(void)
     /*  */
 832 {
 833         int i, j;
 834         extern unsigned long pg0[1024];
 835 
 836         sti();
 837 /* rebooting needs to touch the page at absolute addr 0 */
 838         pg0[0] = 7;
 839         *((unsigned short *)0x472) = 0x1234;
 840         for (;;) {
 841                 for (i=0; i<100; i++) {
 842                         kb_wait();
 843                         for(j = 0; j < 100000 ; j++)
 844                                 /* nothing */;
 845                         outb(0xfe,0x64);         /* pulse reset low */
 846                 }
 847                 __asm__("\tlidt _no_idt");
 848         }
 849 }
 850 
 851 unsigned long kbd_init(unsigned long kmem_start)
     /*  */
 852 {
 853         int i;
 854         struct kbd_struct * kbd;
 855 
 856         kbd = kbd_table + 0;
 857         for (i = 0 ; i < NR_CONSOLES ; i++,kbd++) {
 858                 kbd->flags = KBD_DEFFLAGS;
 859                 kbd->default_flags = KBD_DEFFLAGS;
 860         }
 861 
 862         bh_base[KEYBOARD_BH].routine = kbd_bh;
 863         request_irq(KEYBOARD_IRQ,keyboard_interrupt);
 864         mark_bh(KEYBOARD_BH);
 865         return kmem_start;
 866 }
/* */
root/drivers/char/keyboard.c

DEFINITIONS
