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
pause
num
lastcons
send_intr
scrll_forw
scrll_back
boot_it
compose
SAK
do_spec
do_lowercase
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 v0.99 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/interrupt.h>
  18 #include <linux/tty.h>
  19 #include <linux/tty_flip.h>
  20 #include <linux/mm.h>
  21 #include <linux/ptrace.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 "kbd_kern.h"
  29 #include "diacr.h"
  30 #include "vt_kern.h"
  31 
  32 #define SIZE(x) (sizeof(x)/sizeof((x)[0]))
  33 
  34 #define KBD_REPORT_ERR
  35 #define KBD_REPORT_UNKN
  36 
  37 #ifndef KBD_DEFMODE
  38 #define KBD_DEFMODE ((1 << VC_REPEAT) | (1 << VC_META))
  39 #endif
  40 
  41 #ifndef KBD_DEFLEDS
  42 /*
  43  * Some laptops take the 789uiojklm,. keys as number pad when NumLock
  44  * is on. This seems a good reason to start with NumLock off.
  45  */
  46 #define KBD_DEFLEDS 0
  47 #endif
  48 
  49 #ifndef KBD_DEFLOCK
  50 #define KBD_DEFLOCK 0
  51 #endif
  52 
  53 /*
  54  * The default IO slowdown is doing 'inb()'s from 0x61, which should be
  55  * safe. But as that is the keyboard controller chip address, we do our
  56  * slowdowns here by doing short jumps: the keyboard controller should
  57  * be able to keep up
  58  */
  59 #define REALLY_SLOW_IO
  60 #define SLOW_IO_BY_JUMPING
  61 #include <asm/io.h>
  62 #include <asm/system.h>
  63 
  64 extern void poke_blanked_console(void);
  65 extern void ctrl_alt_del(void);
  66 extern void change_console(unsigned int new_console);
  67 extern void scrollback(int);
  68 extern void scrollfront(int);
  69 
  70 #define fake_keyboard_interrupt() \
  71 __asm__ __volatile__("int $0x21")
  72 
  73 unsigned char kbd_read_mask = 0x01;     /* modified by psaux.c */
  74 
  75 /*
  76  * global state includes the following, and various static variables
  77  * in this module: prev_scancode, shift_state, diacr, npadch,
  78  *   dead_key_next, last_console
  79  */
  80 
  81 /* shift state counters.. */
  82 static unsigned char k_down[NR_SHIFT] = {0, };
  83 /* keyboard key bitmap */
  84 static unsigned long key_down[8] = { 0, };
  85 
  86 static int want_console = -1;
  87 static int last_console = 0;            /* last used VC */
  88 static int dead_key_next = 0;
  89 /* 
  90  * In order to retrieve the shift_state (for the mouse server), either
  91  * the variable must be global, or a new procedure must be create to 
  92  * return the value. I chose the former way.
  93  */
  94 /*static*/ int shift_state = 0;
  95 static int npadch = -1;                 /* -1 or number assembled on pad */
  96 static unsigned char diacr = 0;
  97 static char rep = 0;                    /* flag telling character repeat */
  98 struct kbd_struct kbd_table[NR_CONSOLES];
  99 static struct tty_struct **ttytab;
 100 static struct kbd_struct * kbd = kbd_table;
 101 static struct tty_struct * tty = NULL;
 102 
 103 /* used only by send_data - set by keyboard_interrupt */
 104 static volatile unsigned char acknowledge = 0;
 105 static volatile unsigned char resend = 0;
 106 
 107 typedef void (*k_hand)(unsigned char value, char up_flag);
 108 typedef void (k_handfn)(unsigned char value, char up_flag);
 109 
 110 static k_handfn
 111         do_self, do_fn, do_spec, do_pad, do_dead, do_cons, do_cur, do_shift,
 112         do_meta, do_ascii, do_lock, do_lowercase;
 113 
 114 static k_hand key_handler[] = {
 115         do_self, do_fn, do_spec, do_pad, do_dead, do_cons, do_cur, do_shift,
 116         do_meta, do_ascii, do_lock, do_lowercase
 117 };
 118 
 119 /* maximum values each key_handler can handle */
 120 const int max_vals[] = {
 121         255, NR_FUNC - 1, 15, 17, 4, 255, 3, NR_SHIFT,
 122         255, 9, 3, 255
 123 };
 124 
 125 const int NR_TYPES = SIZE(max_vals);
 126 
 127 static void put_queue(int);
 128 static unsigned char handle_diacr(unsigned char);
 129 static void SAK(void);
 130 
 131 /* pt_regs - set by keyboard_interrupt(), used by show_ptregs() */
 132 static struct pt_regs * pt_regs;
 133 
 134 static inline void kb_wait(void)
     /*  */
 135 {
 136         int i;
 137 
 138         for (i=0; i<0x10000; i++)
 139                 if ((inb_p(0x64) & 0x02) == 0)
 140                         break;
 141 }
 142 
 143 static inline void send_cmd(unsigned char c)
     /*  */
 144 {
 145         kb_wait();
 146         outb(c,0x64);
 147 }
 148 
 149 /*
 150  * Translation of escaped scancodes to keysyms.
 151  * This should be user-settable.
 152  */
 153 #define E0_BASE 96
 154 
 155 #define E0_KPENTER (E0_BASE+0)
 156 #define E0_RCTRL   (E0_BASE+1)
 157 #define E0_KPSLASH (E0_BASE+2)
 158 #define E0_PRSCR   (E0_BASE+3)
 159 #define E0_RALT    (E0_BASE+4)
 160 #define E0_BREAK   (E0_BASE+5)  /* (control-pause) */
 161 #define E0_HOME    (E0_BASE+6)
 162 #define E0_UP      (E0_BASE+7)
 163 #define E0_PGUP    (E0_BASE+8)
 164 #define E0_LEFT    (E0_BASE+9)
 165 #define E0_RIGHT   (E0_BASE+10)
 166 #define E0_END     (E0_BASE+11)
 167 #define E0_DOWN    (E0_BASE+12)
 168 #define E0_PGDN    (E0_BASE+13)
 169 #define E0_INS     (E0_BASE+14)
 170 #define E0_DEL     (E0_BASE+15)
 171 /* BTC */
 172 #define E0_MACRO   (E0_BASE+16)
 173 /* LK450 */
 174 #define E0_F13     (E0_BASE+17)
 175 #define E0_F14     (E0_BASE+18)
 176 #define E0_HELP    (E0_BASE+19)
 177 #define E0_DO      (E0_BASE+20)
 178 #define E0_F17     (E0_BASE+21)
 179 #define E0_KPMINPLUS (E0_BASE+22)
 180 
 181 #define E1_PAUSE   (E0_BASE+23)
 182 
 183 static unsigned char e0_keys[128] = {
 184   0, 0, 0, 0, 0, 0, 0, 0,                             /* 0x00-0x07 */
 185   0, 0, 0, 0, 0, 0, 0, 0,                             /* 0x08-0x0f */
 186   0, 0, 0, 0, 0, 0, 0, 0,                             /* 0x10-0x17 */
 187   0, 0, 0, 0, E0_KPENTER, E0_RCTRL, 0, 0,             /* 0x18-0x1f */
 188   0, 0, 0, 0, 0, 0, 0, 0,                             /* 0x20-0x27 */
 189   0, 0, 0, 0, 0, 0, 0, 0,                             /* 0x28-0x2f */
 190   0, 0, 0, 0, 0, E0_KPSLASH, 0, E0_PRSCR,             /* 0x30-0x37 */
 191   E0_RALT, 0, 0, 0, 0, E0_F13, E0_F14, E0_HELP,       /* 0x38-0x3f */
 192   E0_DO, E0_F17, 0, 0, 0, 0, E0_BREAK, E0_HOME,       /* 0x40-0x47 */
 193   E0_UP, E0_PGUP, 0, E0_LEFT, 0, E0_RIGHT, E0_KPMINPLUS, E0_END,/* 0x48-0x4f */
 194   E0_DOWN, E0_PGDN, E0_INS, E0_DEL, 0, 0, 0, 0,       /* 0x50-0x57 */
 195   0, 0, 0, 0, 0, 0, 0, 0,                             /* 0x58-0x5f */
 196   0, 0, 0, 0, 0, 0, 0, 0,                             /* 0x60-0x67 */
 197   0, 0, 0, 0, 0, 0, 0, E0_MACRO,                      /* 0x68-0x6f */
 198   0, 0, 0, 0, 0, 0, 0, 0,                             /* 0x70-0x77 */
 199   0, 0, 0, 0, 0, 0, 0, 0                              /* 0x78-0x7f */
 200 };
 201 
 202 static void keyboard_interrupt(int int_pt_regs)
     /*  */
 203 {
 204         unsigned char scancode;
 205         static unsigned int prev_scancode = 0;   /* remember E0, E1 */
 206         char up_flag;                            /* 0 or 0200 */
 207         char raw_mode;
 208 
 209         pt_regs = (struct pt_regs *) int_pt_regs;
 210         send_cmd(0xAD);         /* disable keyboard */
 211         kb_wait();
 212         if ((inb_p(0x64) & kbd_read_mask) != 0x01)
 213                 goto end_kbd_intr;
 214         scancode = inb(0x60);
 215         mark_bh(KEYBOARD_BH);
 216         if (scancode == 0xfa) {
 217                 acknowledge = 1;
 218                 goto end_kbd_intr;
 219         } else if (scancode == 0xfe) {
 220                 resend = 1;
 221                 goto end_kbd_intr;
 222         } else if (scancode == 0) {
 223 #ifdef KBD_REPORT_ERR
 224                 printk("keyboard buffer overflow\n");
 225 #endif
 226                 goto end_kbd_intr;
 227         } else if (scancode == 0xff) {
 228 #ifdef KBD_REPORT_ERR
 229                 printk("keyboard error\n");
 230 #endif
 231                 prev_scancode = 0;
 232                 goto end_kbd_intr;
 233         }
 234         tty = ttytab[fg_console];
 235         kbd = kbd_table + fg_console;
 236         if ((raw_mode = vc_kbd_mode(kbd,VC_RAW))) {
 237                 put_queue(scancode);
 238                 /* we do not return yet, because we want to maintain
 239                    the key_down array, so that we have the correct
 240                    values when finishing RAW mode or when changing VT's */
 241         }
 242         if (scancode == 0xe0 || scancode == 0xe1) {
 243                 prev_scancode = scancode;
 244                 goto end_kbd_intr;
 245         }
 246 
 247         /*
 248          *  Convert scancode to keysym, using prev_scancode.
 249          */
 250         up_flag = (scancode & 0200);
 251         scancode &= 0x7f;
 252 
 253         if (prev_scancode) {
 254           /*
 255            * usually it will be 0xe0, but a Pause key generates
 256            * e1 1d 45 e1 9d c5 when pressed, and nothing when released
 257            */
 258           if (prev_scancode != 0xe0) {
 259               if (prev_scancode == 0xe1 && scancode == 0x1d) {
 260                   prev_scancode = 0x100;
 261                   goto end_kbd_intr;
 262               } else if (prev_scancode == 0x100 && scancode == 0x45) {
 263                   scancode = E1_PAUSE;
 264                   prev_scancode = 0;
 265               } else {
 266                   printk("keyboard: unknown e1 escape sequence\n");
 267                   prev_scancode = 0;
 268                   goto end_kbd_intr;
 269               }
 270           } else {
 271               prev_scancode = 0;
 272               /*
 273                *  The keyboard maintains its own internal caps lock and
 274                *  num lock statuses. In caps lock mode E0 AA precedes make
 275                *  code and E0 2A follows break code. In num lock mode,
 276                *  E0 2A precedes make code and E0 AA follows break code.
 277                *  We do our own book-keeping, so we will just ignore these.
 278                */
 279               /*
 280                *  For my keyboard there is no caps lock mode, but there are
 281                *  both Shift-L and Shift-R modes. The former mode generates
 282                *  E0 2A / E0 AA pairs, the latter E0 B6 / E0 36 pairs.
 283                *  So, we should also ignore the latter. - aeb@cwi.nl
 284                */
 285               if (scancode == 0x2a || scancode == 0x36)
 286                 goto end_kbd_intr;
 287 
 288               if (e0_keys[scancode])
 289                 scancode = e0_keys[scancode];
 290               else if (!raw_mode) {
 291 #ifdef KBD_REPORT_UNKN
 292                   printk("keyboard: unknown scancode e0 %02x\n", scancode);
 293 #endif
 294                   goto end_kbd_intr;
 295               }
 296           }
 297         } else if (scancode >= E0_BASE && !raw_mode) {
 298 #ifdef KBD_REPORT_UNKN
 299           printk("keyboard: scancode (%02x) not in range 00 - %2x\n",
 300                  scancode, E0_BASE - 1);
 301 #endif
 302           goto end_kbd_intr;
 303         }
 304 
 305         /*
 306          * At this point the variable `scancode' contains the keysym.
 307          * We keep track of the up/down status of the key, and
 308          * return the keysym if in MEDIUMRAW mode.
 309          * (Note: earlier kernels had a bug and did not pass the up/down
 310          * bit to applications.)
 311          */
 312 
 313         if (up_flag) {
 314                 clear_bit(scancode, key_down);
 315                 rep = 0;
 316         } else
 317                 rep = set_bit(scancode, key_down);
 318 
 319         if (raw_mode)
 320                 goto end_kbd_intr;
 321 
 322         if (vc_kbd_mode(kbd, VC_MEDIUMRAW)) {
 323                 put_queue(scancode + up_flag);
 324                 goto end_kbd_intr;
 325         }
 326 
 327         /*
 328          * Small change in philosophy: earlier we defined repetition by
 329          *       rep = scancode == prev_keysym;
 330          *       prev_keysym = scancode;
 331          * but now by the fact that the depressed key was down already.
 332          * Does this ever make a difference?
 333          */
 334 
 335         /*
 336          *  Repeat a key only if the input buffers are empty or the
 337          *  characters get echoed locally. This makes key repeat usable
 338          *  with slow applications and under heavy loads.
 339          */
 340         if (!rep ||
 341             (vc_kbd_mode(kbd,VC_REPEAT) && tty &&
 342              (L_ECHO(tty) || (tty->driver.chars_in_buffer(tty) == 0)))) {
 343                 u_short key_code;
 344                 u_char type;
 345 
 346                 /* the XOR below used to be an OR */
 347                 int shift_final = shift_state ^ kbd->lockstate;
 348 
 349                 key_code = key_map[shift_final][scancode];
 350                 type = KTYP(key_code);
 351 
 352                 if (type == KT_LETTER) {
 353                     type = KT_LATIN;
 354                     if (vc_kbd_led(kbd,VC_CAPSLOCK))
 355                         key_code = key_map[shift_final ^ (1<<KG_SHIFT)][scancode];
 356                 }
 357                 (*key_handler[type])(key_code & 0xff, up_flag);
 358         }
 359 
 360 end_kbd_intr:
 361         send_cmd(0xAE);         /* enable keyboard */
 362 }
 363 
 364 static void put_queue(int ch)
     /*  */
 365 {
 366         wake_up(&keypress_wait);
 367         if (tty) {
 368                 tty_insert_flip_char(tty, ch, 0);
 369                 tty_schedule_flip(tty);
 370         }
 371 }
 372 
 373 static void puts_queue(char *cp)
     /*  */
 374 {
 375         wake_up(&keypress_wait);
 376         if (!tty)
 377                 return;
 378 
 379         while (*cp) {
 380                 tty_insert_flip_char(tty, *cp, 0);
 381                 cp++;
 382         }
 383         tty_schedule_flip(tty);
 384 }
 385 
 386 static void applkey(int key, char mode)
     /*  */
 387 {
 388         static char buf[] = { 0x1b, 'O', 0x00, 0x00 };
 389 
 390         buf[1] = (mode ? 'O' : '[');
 391         buf[2] = key;
 392         puts_queue(buf);
 393 }
 394 
 395 static void enter(void)
     /*  */
 396 {
 397         put_queue(13);
 398         if (vc_kbd_mode(kbd,VC_CRLF))
 399                 put_queue(10);
 400 }
 401 
 402 static void caps_toggle(void)
     /*  */
 403 {
 404         if (rep)
 405                 return;
 406         chg_vc_kbd_led(kbd,VC_CAPSLOCK);
 407 }
 408 
 409 static void caps_on(void)
     /*  */
 410 {
 411         if (rep)
 412                 return;
 413         set_vc_kbd_led(kbd,VC_CAPSLOCK);
 414 }
 415 
 416 static void show_ptregs(void)
     /*  */
 417 {
 418         if (!pt_regs)
 419                 return;
 420         printk("\n");
 421         printk("EIP: %04x:%08lx",0xffff & pt_regs->cs,pt_regs->eip);
 422         if (pt_regs->cs & 3)
 423                 printk(" ESP: %04x:%08lx",0xffff & pt_regs->ss,pt_regs->esp);
 424         printk(" EFLAGS: %08lx\n",pt_regs->eflags);
 425         printk("EAX: %08lx EBX: %08lx ECX: %08lx EDX: %08lx\n",
 426                 pt_regs->orig_eax,pt_regs->ebx,pt_regs->ecx,pt_regs->edx);
 427         printk("ESI: %08lx EDI: %08lx EBP: %08lx",
 428                 pt_regs->esi, pt_regs->edi, pt_regs->ebp);
 429         printk(" DS: %04x ES: %04x FS: %04x GS: %04x\n",
 430                 0xffff & pt_regs->ds,0xffff & pt_regs->es,
 431                 0xffff & pt_regs->fs,0xffff & pt_regs->gs);
 432 }
 433 
 434 static void hold(void)
     /*  */
 435 {
 436         if (rep || !tty)
 437                 return;
 438 
 439         /*
 440          * Note: SCROLLOCK will be set (cleared) by stop_tty (start_tty);
 441          * these routines are also activated by ^S/^Q.
 442          * (And SCROLLOCK can also be set by the ioctl KDSETLED.)
 443          */
 444         if (tty->stopped)
 445                 start_tty(tty);
 446         else
 447                 stop_tty(tty);
 448 }
 449 
 450 #if 0
 451 /* unused at present - and the VC_PAUSE bit is not used anywhere either */
 452 static void pause(void)
     /*  */
 453 {
 454         chg_vc_kbd_mode(kbd,VC_PAUSE);
 455 }
 456 #endif
 457 
 458 static void num(void)
     /*  */
 459 {
 460         if (vc_kbd_mode(kbd,VC_APPLIC)) {
 461                 applkey('P', 1);
 462                 return;
 463         }
 464         if (!rep)       /* no autorepeat for numlock, ChN */
 465                 chg_vc_kbd_led(kbd,VC_NUMLOCK);
 466 }
 467 
 468 static void lastcons(void)
     /*  */
 469 {
 470         /* pressing alt-printscreen switches to the last used console, ChN */
 471         want_console = last_console;
 472 }
 473 
 474 static void send_intr(void)
     /*  */
 475 {
 476         if (!tty || (tty->termios && I_IGNBRK(tty)))
 477                 return;
 478         tty_insert_flip_char(tty, 0, TTY_BREAK);
 479 }
 480 
 481 static void scrll_forw(void)
     /*  */
 482 {
 483         scrollfront(0);
 484 }
 485 
 486 static void scrll_back(void)
     /*  */
 487 {
 488         scrollback(0);
 489 }
 490 
 491 static void boot_it(void)
     /*  */
 492 {
 493         ctrl_alt_del();
 494 }
 495 
 496 static void compose(void)
     /*  */
 497 {
 498         dead_key_next = 1;
 499 }
 500 
 501 static void SAK(void)
     /*  */
 502 {
 503         do_SAK(tty);
 504 #if 0
 505         /*
 506          * Need to fix SAK handling to fix up RAW/MEDIUM_RAW and
 507          * vt_cons modes before we can enable RAW/MEDIUM_RAW SAK
 508          * handling.
 509          * 
 510          * We should do this some day --- the whole point of a secure
 511          * attention key is that it should be guaranteed to always
 512          * work.
 513          */
 514         clr_vc_kbd_flag(kbd, VC_RAW);
 515         clr_vc_kbd_flag(kbd, VC_MEDIUMRAW);
 516         vt_cons[fg_console].vc_mode = KD_TEXT;
 517         vt_cons[fg_console].vt_mode.mode = VT_AUTO;
 518         vt_cons[fg_console].vt_mode.waitv = 0;
 519         vt_cons[fg_console].vt_mode.relsig = 0;
 520         vt_cons[fg_console].vt_mode.acqsig = 0;
 521         vt_cons[fg_console].vt_mode.frsig = 0;
 522         vt_cons[fg_console].vt_pid = -1;
 523         vt_cons[fg_console].vt_newvt = -1;
 524         unblank_screen();
 525 #endif
 526 }
 527 
 528 static void do_spec(unsigned char value, char up_flag)
     /*  */
 529 {
 530         typedef void (*fnp)(void);
 531         fnp fn_table[] = {
 532                 NULL,           enter,          show_ptregs,    show_mem,
 533                 show_state,     send_intr,      lastcons,       caps_toggle,
 534                 num,            hold,           scrll_forw,     scrll_back,
 535                 boot_it,        caps_on,        compose,        SAK
 536         };
 537 
 538         if (up_flag)
 539                 return;
 540         if (value >= SIZE(fn_table))
 541                 return;
 542         if (!fn_table[value])
 543                 return;
 544         fn_table[value]();
 545 }
 546 
 547 static void do_lowercase(unsigned char value, char up_flag)
     /*  */
 548 {
 549         printk("keyboard.c: do_lowercase was called - impossible\n");
 550 }
 551 
 552 static void do_self(unsigned char value, char up_flag)
     /*  */
 553 {
 554         if (up_flag)
 555                 return;         /* no action, if this is a key release */
 556 
 557         if (diacr)
 558                 value = handle_diacr(value);
 559 
 560         if (dead_key_next) {
 561                 dead_key_next = 0;
 562                 diacr = value;
 563                 return;
 564         }
 565 
 566         put_queue(value);
 567 }
 568 
 569 #define A_GRAVE  '`'
 570 #define A_ACUTE  '\''
 571 #define A_CFLEX  '^'
 572 #define A_TILDE  '~'
 573 #define A_DIAER  '"'
 574 static unsigned char ret_diacr[] =
 575         {A_GRAVE, A_ACUTE, A_CFLEX, A_TILDE, A_DIAER };
 576 
 577 /* If a dead key pressed twice, output a character corresponding to it, */
 578 /* otherwise just remember the dead key.                                */
 579 
 580 static void do_dead(unsigned char value, char up_flag)
     /*  */
 581 {
 582         if (up_flag)
 583                 return;
 584 
 585         value = ret_diacr[value];
 586         if (diacr == value) {   /* pressed twice */
 587                 diacr = 0;
 588                 put_queue(value);
 589                 return;
 590         }
 591         diacr = value;
 592 }
 593 
 594 
 595 /* If space is pressed, return the character corresponding the pending  */
 596 /* dead key, otherwise try to combine the two.                          */
 597 
 598 unsigned char handle_diacr(unsigned char ch)
     /*  */
 599 {
 600         int d = diacr;
 601         int i;
 602 
 603         diacr = 0;
 604         if (ch == ' ')
 605                 return d;
 606 
 607         for (i = 0; i < accent_table_size; i++) {
 608                 if (accent_table[i].diacr == d && accent_table[i].base == ch)
 609                         return accent_table[i].result;
 610         }
 611 
 612         put_queue(d);
 613         return ch;
 614 }
 615 
 616 static void do_cons(unsigned char value, char up_flag)
     /*  */
 617 {
 618         if (up_flag)
 619                 return;
 620         want_console = value;
 621 }
 622 
 623 static void do_fn(unsigned char value, char up_flag)
     /*  */
 624 {
 625         if (up_flag)
 626                 return;
 627         if (value < SIZE(func_table))
 628                 puts_queue(func_table[value]);
 629         else
 630                 printk("do_fn called with value=%d\n", value);
 631 }
 632 
 633 static void do_pad(unsigned char value, char up_flag)
     /*  */
 634 {
 635         static char *pad_chars = "0123456789+-*/\015,.?";
 636         static char *app_map = "pqrstuvwxylSRQMnn?";
 637 
 638         if (up_flag)
 639                 return;         /* no action, if this is a key release */
 640 
 641         /* kludge... shift forces cursor/number keys */
 642         if (vc_kbd_mode(kbd,VC_APPLIC) && !k_down[KG_SHIFT]) {
 643                 applkey(app_map[value], 1);
 644                 return;
 645         }
 646 
 647         if (!vc_kbd_led(kbd,VC_NUMLOCK))
 648                 switch (value) {
 649                         case KVAL(K_PCOMMA):
 650                         case KVAL(K_PDOT):
 651                                 do_fn(KVAL(K_REMOVE), 0);
 652                                 return;
 653                         case KVAL(K_P0):
 654                                 do_fn(KVAL(K_INSERT), 0);
 655                                 return;
 656                         case KVAL(K_P1):
 657                                 do_fn(KVAL(K_SELECT), 0);
 658                                 return;
 659                         case KVAL(K_P2):
 660                                 do_cur(KVAL(K_DOWN), 0);
 661                                 return;
 662                         case KVAL(K_P3):
 663                                 do_fn(KVAL(K_PGDN), 0);
 664                                 return;
 665                         case KVAL(K_P4):
 666                                 do_cur(KVAL(K_LEFT), 0);
 667                                 return;
 668                         case KVAL(K_P6):
 669                                 do_cur(KVAL(K_RIGHT), 0);
 670                                 return;
 671                         case KVAL(K_P7):
 672                                 do_fn(KVAL(K_FIND), 0);
 673                                 return;
 674                         case KVAL(K_P8):
 675                                 do_cur(KVAL(K_UP), 0);
 676                                 return;
 677                         case KVAL(K_P9):
 678                                 do_fn(KVAL(K_PGUP), 0);
 679                                 return;
 680                         case KVAL(K_P5):
 681                                 applkey('G', vc_kbd_mode(kbd, VC_APPLIC));
 682                                 return;
 683                 }
 684 
 685         put_queue(pad_chars[value]);
 686         if (value == KVAL(K_PENTER) && vc_kbd_mode(kbd, VC_CRLF))
 687                 put_queue(10);
 688 }
 689 
 690 static void do_cur(unsigned char value, char up_flag)
     /*  */
 691 {
 692         static char *cur_chars = "BDCA";
 693         if (up_flag)
 694                 return;
 695 
 696         applkey(cur_chars[value], vc_kbd_mode(kbd,VC_CKMODE));
 697 }
 698 
 699 static void do_shift(unsigned char value, char up_flag)
     /*  */
 700 {
 701         int old_state = shift_state;
 702 
 703         if (rep)
 704                 return;
 705 
 706         /* kludge... */
 707         if (value == KVAL(K_CAPSSHIFT)) {
 708                 value = KVAL(K_SHIFT);
 709                 if (!up_flag)
 710                         clr_vc_kbd_led(kbd, VC_CAPSLOCK);
 711         }
 712 
 713         if (up_flag) {
 714                 /* handle the case that two shift or control
 715                    keys are depressed simultaneously */
 716                 if (k_down[value])
 717                         k_down[value]--;
 718         } else
 719                 k_down[value]++;
 720 
 721         if (k_down[value])
 722                 shift_state |= (1 << value);
 723         else
 724                 shift_state &= ~ (1 << value);
 725 
 726         /* kludge */
 727         if (up_flag && shift_state != old_state && npadch != -1) {
 728                 put_queue(npadch);
 729                 npadch = -1;
 730         }
 731 }
 732 
 733 /* called after returning from RAW mode or when changing consoles -
 734    recompute k_down[] and shift_state from key_down[] */
 735 void compute_shiftstate(void)
     /*  */
 736 {
 737         int i, j, k, sym, val;
 738 
 739         shift_state = 0;
 740         for(i=0; i < SIZE(k_down); i++)
 741           k_down[i] = 0;
 742 
 743         for(i=0; i < SIZE(key_down); i++)
 744           if(key_down[i]) {     /* skip this word if not a single bit on */
 745             k = (i<<5);
 746             for(j=0; j<32; j++,k++)
 747               if(test_bit(k, key_down)) {
 748                 sym = key_map[0][k];
 749                 if(KTYP(sym) == KT_SHIFT) {
 750                   val = KVAL(sym);
 751                   k_down[val]++;
 752                   shift_state |= (1<<val);
 753                 }
 754               }
 755           }
 756 }
 757 
 758 static void do_meta(unsigned char value, char up_flag)
     /*  */
 759 {
 760         if (up_flag)
 761                 return;
 762 
 763         if (vc_kbd_mode(kbd, VC_META)) {
 764                 put_queue('\033');
 765                 put_queue(value);
 766         } else
 767                 put_queue(value | 0x80);
 768 }
 769 
 770 static void do_ascii(unsigned char value, char up_flag)
     /*  */
 771 {
 772         if (up_flag)
 773                 return;
 774 
 775         if (npadch == -1)
 776                 npadch = value;
 777         else
 778                 npadch = (npadch * 10 + value) % 1000;
 779 }
 780 
 781 static void do_lock(unsigned char value, char up_flag)
     /*  */
 782 {
 783         if (up_flag || rep)
 784                 return;
 785         chg_vc_kbd_lock(kbd, value);
 786 }
 787 
 788 /*
 789  * send_data sends a character to the keyboard and waits
 790  * for a acknowledge, possibly retrying if asked to. Returns
 791  * the success status.
 792  */
 793 static int send_data(unsigned char data)
     /*  */
 794 {
 795         int retries = 3;
 796         int i;
 797 
 798         do {
 799                 kb_wait();
 800                 acknowledge = 0;
 801                 resend = 0;
 802                 outb_p(data, 0x60);
 803                 for(i=0; i<0x20000; i++) {
 804                         inb_p(0x64);            /* just as a delay */
 805                         if (acknowledge)
 806                                 return 1;
 807                         if (resend)
 808                                 break;
 809                 }
 810                 if (!resend)
 811                         return 0;
 812         } while (retries-- > 0);
 813         return 0;
 814 }
 815 
 816 /*
 817  * This routine is the bottom half of the keyboard interrupt
 818  * routine, and runs with all interrupts enabled. It does
 819  * console changing, led setting and copy_to_cooked, which can
 820  * take a reasonably long time.
 821  *
 822  * Aside from timing (which isn't really that important for
 823  * keyboard interrupts as they happen often), using the software
 824  * interrupt routines for this thing allows us to easily mask
 825  * this when we don't want any of the above to happen. Not yet
 826  * used, but this allows for easy and efficient race-condition
 827  * prevention later on.
 828  */
 829 static void kbd_bh(void * unused)
     /*  */
 830 {
 831         static unsigned char old_leds = 0xff;
 832         unsigned char leds = kbd_table[fg_console].ledstate;
 833 
 834         if (leds != old_leds) {
 835                 old_leds = leds;
 836                 if (!send_data(0xed) || !send_data(leds))
 837                         send_data(0xf4);        /* re-enable kbd if any errors */
 838         }
 839         if (want_console >= 0) {
 840                 if (want_console != fg_console) {
 841                         last_console = fg_console;
 842                         change_console(want_console);
 843                 }
 844                 want_console = -1;
 845         }
 846         poke_blanked_console();
 847         cli();
 848         if ((inb_p(0x64) & kbd_read_mask) == 0x01)
 849                 fake_keyboard_interrupt();
 850         sti();
 851 }
 852 
 853 long no_idt[2] = {0, 0};
 854 
 855 /*
 856  * This routine reboots the machine by asking the keyboard
 857  * controller to pulse the reset-line low. We try that for a while,
 858  * and if it doesn't work, we do some other stupid things.
 859  */
 860 void hard_reset_now(void)
     /*  */
 861 {
 862         int i, j;
 863         extern unsigned long pg0[1024];
 864 
 865         sti();
 866 /* rebooting needs to touch the page at absolute addr 0 */
 867         pg0[0] = 7;
 868         *((unsigned short *)0x472) = 0x1234;
 869         for (;;) {
 870                 for (i=0; i<100; i++) {
 871                         kb_wait();
 872                         for(j = 0; j < 100000 ; j++)
 873                                 /* nothing */;
 874                         outb(0xfe,0x64);         /* pulse reset low */
 875                 }
 876                 __asm__("\tlidt _no_idt");
 877         }
 878 }
 879 
 880 unsigned long kbd_init(unsigned long kmem_start)
     /*  */
 881 {
 882         int i;
 883         struct kbd_struct * kbd;
 884         extern struct tty_driver console_driver;
 885 
 886         kbd = kbd_table + 0;
 887         for (i = 0 ; i < NR_CONSOLES ; i++,kbd++) {
 888                 kbd->ledstate = KBD_DEFLEDS;
 889                 kbd->default_ledstate = KBD_DEFLEDS;
 890                 kbd->lockstate = KBD_DEFLOCK;
 891                 kbd->modeflags = KBD_DEFMODE;
 892         }
 893         ttytab = console_driver.table;
 894 
 895         bh_base[KEYBOARD_BH].routine = kbd_bh;
 896         request_irq(KEYBOARD_IRQ, keyboard_interrupt, 0, "keyboard");
 897         mark_bh(KEYBOARD_BH);
 898         return kmem_start;
 899 }
/* */
root/drivers/char/keyboard.c

DEFINITIONS
