kernel/chr_drv/keyboard.c

/* */
This source file includes following definitions.
kb_wait
keyboard_interrupt
put_queue
puts_queue
applkey
enter
caps_toggle
show_ptregs
hold
num
lastcons
send_intr
do_spec
do_self
do_dead
handle_diacr
do_cons
do_fn
do_pad
do_cur
do_shift
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  *
  11  * Loadable keymaps by Risto Kankkunen, May 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 
  25 #ifndef KBD_DEFFLAGS
  26 #ifdef CONFIG_KBD_META
  27 #define KBD_DEFFLAGS ((1 << VC_NUMLOCK) | (1 << VC_REPEAT) | (1 << VC_META))
  28 #else
  29 #define KBD_DEFFLAGS ((1 << VC_NUMLOCK) | (1 << VC_REPEAT))
  30 #endif
  31 #endif
  32 
  33 #define SHIFT_KEYS      ((1 << KG_LSHIFT) | (1 << KG_RSHIFT))
  34 #define CTRL_KEYS       ((1 << KG_LCTRL)  | (1 << KG_RCTRL))
  35 #define ALT_KEYS        ((1 << KG_LALT)   | (1 << KG_RALT))
  36 #define ALTGR_KEYS      ((1 << KG_LALTGR) | (1 << KG_RALTGR))
  37 
  38 /*
  39  * The default IO slowdown is doing 'inb()'s from 0x61, which should be
  40  * safe. But as that is the keyboard controller chip address, we do our
  41  * slowdowns here by doing short jumps: the keyboard controller should
  42  * be able to keep up
  43  */
  44 #define REALLY_SLOW_IO
  45 #define SLOW_IO_BY_JUMPING
  46 #include <asm/io.h>
  47 #include <asm/system.h>
  48 
  49 extern void do_keyboard_interrupt(void);
  50 extern void ctrl_alt_del(void);
  51 extern void change_console(unsigned int new_console);
  52 extern void scrollback(int);
  53 extern void scrollfront(int);
  54 
  55 #define fake_keyboard_interrupt() \
  56 __asm__ __volatile__("int $0x21")
  57 
  58 unsigned long kbd_flags = 0;
  59 unsigned long kbd_dead_keys = 0;
  60 unsigned long kbd_prev_dead_keys = 0;
  61 
  62 static int want_console = -1;
  63 static int last_console = 0;            /* last used VC */
  64 static char rep = 0;                    /* flag telling character repeat */
  65 struct kbd_struct kbd_table[NR_CONSOLES];
  66 static struct kbd_struct * kbd = kbd_table;
  67 static struct tty_struct * tty = NULL;
  68 
  69 static volatile unsigned char acknowledge = 0;
  70 static volatile unsigned char resend = 0;
  71 
  72 typedef unsigned short u_word;
  73 typedef void (*k_hand)(unsigned char value, char up_flag);
  74 
  75 static void do_self(unsigned char value, char up_flag);
  76 static void do_fn(unsigned char value, char up_flag);
  77 static void do_spec(unsigned char value, char up_flag);
  78 static void do_pad(unsigned char value, char up_flag);
  79 static void do_dead(unsigned char value, char up_flag);
  80 static void do_cons(unsigned char value, char up_flag);
  81 static void do_cur(unsigned char value, char up_flag);
  82 static void do_shift(unsigned char value, char up_flag);
  83 
  84 static k_hand key_handler[] = {
  85         do_self, do_fn, do_spec, do_pad, do_dead, do_cons, do_cur, do_shift
  86 };
  87 
  88 /* maximum values each key_handler can handle */
  89 const int max_vals[] = {
  90         255, 25, 13, 16, 4, 255, 3, 255
  91 };
  92 
  93 const int NR_TYPES = (sizeof(max_vals) / sizeof(u_char));
  94 
  95 #define E0_BASE 96
  96 
  97 static int shift_state = 0;
  98 static int diacr = -1;
  99 static int npadch = 0;
 100 
 101 static void put_queue(int);
 102 static unsigned int handle_diacr(unsigned int);
 103 
 104 static struct pt_regs * pt_regs;
 105 
 106 static inline void kb_wait(void)
     /*  */
 107 {
 108         int i;
 109 
 110         for (i=0; i<0x10000; i++)
 111                 if ((inb_p(0x64) & 0x02) == 0)
 112                         break;
 113 }
 114 
 115 static void keyboard_interrupt(int int_pt_regs)
     /*  */
 116 {
 117         unsigned char scancode;
 118         static unsigned char prev_scancode = 0;
 119 
 120         pt_regs = (struct pt_regs *) int_pt_regs;
 121         kbd_prev_dead_keys |= kbd_dead_keys;
 122         if (!kbd_dead_keys)
 123                 kbd_prev_dead_keys = 0;
 124         kbd_dead_keys = 0;
 125         kb_wait();
 126         if (!(inb_p(0x64) & 0x01))
 127                 goto end_kbd_intr;
 128         scancode = inb(0x60);
 129         mark_bh(KEYBOARD_BH);
 130         if (scancode == 0xfa) {
 131                 acknowledge = 1;
 132                 goto end_kbd_intr;
 133         } else if (scancode == 0xfe) {
 134                 resend = 1;
 135                 goto end_kbd_intr;
 136         }
 137         tty = TTY_TABLE(0);
 138         kbd = kbd_table + fg_console;
 139         if (vc_kbd_flag(kbd,VC_RAW)) {
 140                 kbd_flags = 0;
 141                 put_queue(scancode);
 142                 goto end_kbd_intr;
 143         }
 144         if (scancode == 0xe0) {
 145                 set_kbd_dead(KGD_E0);
 146                 goto end_kbd_intr;
 147         } else if (scancode == 0xe1) {
 148                 set_kbd_dead(KGD_E1);
 149                 goto end_kbd_intr;
 150         }
 151         /*
 152          *  The keyboard maintains its own internal caps lock and num lock
 153          *  statuses. In caps lock mode E0 AA precedes make code and E0 2A
 154          *  follows break code. In num lock mode, E0 2A precedes make
 155          *  code and E0 AA follows break code. We do our own book-keeping,
 156          *  so we will just ignore these.
 157          */
 158         if (kbd_dead(KGD_E0) && (scancode == 0x2a || scancode == 0xaa ||
 159                                  scancode == 0x36 || scancode == 0xb6))
 160                 goto end_kbd_intr;
 161         /*
 162          *  Repeat a key only if the input buffers are empty or the
 163          *  characters get echoed locally. This makes key repeat usable
 164          *  with slow applications and under heavy loads.
 165          */
 166         rep = scancode == prev_scancode;
 167         prev_scancode = scancode;
 168         if (!rep || 
 169             (vc_kbd_flag(kbd,VC_REPEAT) && tty &&
 170              (L_ECHO(tty) || (EMPTY(&tty->secondary) && EMPTY(&tty->read_q))))) {
 171                 static unsigned char e0_keys[] = {
 172                         0x1c,   /* keypad enter */
 173                         0x1d,   /* right control */
 174                         0x35,   /* keypad slash */
 175                         0x37,   /* print screen */
 176                         0x38,   /* right alt */
 177                         0x46,   /* break (control-pause) */
 178                         0x47,   /* editpad home */
 179                         0x48,   /* editpad up */
 180                         0x49,   /* editpad pgup */
 181                         0x4b,   /* editpad left */
 182                         0x4d,   /* editpad right */
 183                         0x4f,   /* editpad end */
 184                         0x50,   /* editpad dn */
 185                         0x51,   /* editpad pgdn */
 186                         0x52,   /* editpad ins */
 187                         0x53    /* editpad del */
 188                 };
 189                 u_word key_code;
 190                 char break_flag = scancode > 0x7f;
 191 
 192                 scancode &= 0x7f;
 193                 if (scancode >= E0_BASE) {
 194 #if 0
 195                         printk("keyboard: scancode (%02x) not in range 00 - %2x\n", scancode, E0_BASE - 1);
 196 #endif
 197                         goto end_kbd_intr;
 198                 }
 199 
 200                 if (kbd_dead(KGD_E0)) {
 201                         int i;
 202                         for (i = 0; i < sizeof(e0_keys); i++)
 203                                 if (scancode == e0_keys[i]) {
 204                                         scancode = E0_BASE + i;
 205                                         i = -1;
 206                                         break;
 207                                 }
 208                         if (i != -1) {
 209 #if 0
 210                                 printk("keyboard: unknown scancode e0 %02x\n", scancode);
 211 #endif
 212                                 goto end_kbd_intr;
 213                         }
 214                 }
 215 
 216                 key_code = key_map[shift_state][scancode];
 217                 (*key_handler[key_code >> 8])(key_code & 0xff, break_flag);
 218              }
 219 end_kbd_intr:
 220         return;
 221 }
 222 
 223 static void put_queue(int ch)
     /*  */
 224 {
 225         struct tty_queue *qp;
 226 
 227         wake_up(&keypress_wait);
 228         if (!tty)
 229                 return;
 230         qp = &tty->read_q;
 231 
 232         if (LEFT(qp)) {
 233                 qp->buf[qp->head] = ch;
 234                 INC(qp->head);
 235                 wake_up_interruptible(&qp->proc_list);
 236         }
 237 }
 238 
 239 static void puts_queue(char *cp)
     /*  */
 240 {
 241         struct tty_queue *qp;
 242         char ch;
 243 
 244         /* why interruptible here, plain wake_up above? */
 245         wake_up_interruptible(&keypress_wait);
 246         if (!tty)
 247                 return;
 248         qp = &tty->read_q;
 249 
 250         while ((ch = *(cp++)) != 0) {
 251                 if (LEFT(qp)) {
 252                         qp->buf[qp->head] = ch;
 253                         INC(qp->head);
 254                 }
 255         }
 256         wake_up_interruptible(&qp->proc_list);
 257 }
 258 
 259 static void applkey(int key, char mode)
     /*  */
 260 {
 261         static char buf[] = { 0x1b, 'O', 0x00, 0x00 };
 262 
 263         buf[1] = (mode ? 'O' : '[');
 264         buf[2] = key;
 265         puts_queue(buf);
 266 }
 267 
 268 static void enter(void)
     /*  */
 269 {
 270         put_queue(13);
 271         if (vc_kbd_flag(kbd,VC_CRLF))
 272                 put_queue(10);
 273 }
 274 
 275 static void caps_toggle(void)
     /*  */
 276 {
 277         if (rep)
 278                 return;
 279         set_kbd_flag(KG_CAPSLOCK);
 280         chg_vc_kbd_flag(kbd,VC_CAPSLOCK);
 281 }
 282 
 283 static void show_ptregs(void)
     /*  */
 284 {
 285         if (!pt_regs)
 286                 return;
 287         printk("\n");
 288         printk("EIP: %04x:%08x",0xffff & pt_regs->cs,pt_regs->eip);
 289         if (pt_regs->cs & 3)
 290                 printk(" ESP: %04x:%08x",0xffff & pt_regs->ss,pt_regs->esp);
 291         printk(" EFLAGS: %08x\n",pt_regs->eflags);
 292         printk("EAX: %08x EBX: %08x ECX: %08x EDX: %08x\n",
 293                 pt_regs->orig_eax,pt_regs->ebx,pt_regs->ecx,pt_regs->edx);
 294         printk("ESI: %08x EDI: %08x EBP: %08x",
 295                 pt_regs->esi, pt_regs->edi, pt_regs->ebp);
 296         printk(" DS: %04x ES: %04x FS: %04x GS: %04x\n",
 297                 0xffff & pt_regs->ds,0xffff & pt_regs->es,
 298                 0xffff & pt_regs->fs,0xffff & pt_regs->gs);
 299 }
 300 
 301 static void hold(void)
     /*  */
 302 {
 303         /* kludge, should have a control key table */
 304         if (kbd_flags & CTRL_KEYS) {
 305                 show_state();
 306                 return;
 307         }
 308 
 309         if (rep || !tty)
 310                 return;
 311         if (vc_kbd_flag(kbd, VC_SCROLLOCK))
 312                 /* pressing srcoll lock 2nd time sends ^Q, ChN */
 313                 put_queue(START_CHAR(tty));
 314         else
 315                 /* pressing srcoll lock 1st time sends ^S, ChN */
 316                 put_queue(STOP_CHAR(tty));
 317         chg_vc_kbd_flag(kbd,VC_SCROLLOCK);
 318 }
 319 
 320 static void num(void)
     /*  */
 321 {
 322 #if 0
 323         if (kbd_flags & CTRL_KEYS) {
 324                 /* pause key pressed, sends E1 1D 45, ChN */
 325                 chg_vc_kbd_flag(kbd,VC_PAUSE);
 326                 return;
 327         }
 328 #endif
 329         if (vc_kbd_flag(kbd,VC_APPLIC)) {
 330                 applkey('P', 1);
 331                 return;
 332         }
 333         if (!rep)       /* no autorepeat for numlock, ChN */
 334                 chg_vc_kbd_flag(kbd,VC_NUMLOCK);
 335 }
 336 
 337 static void lastcons(void)
     /*  */
 338 {
 339         /* pressing alt-printscreen switches to the last used console, ChN */
 340         want_console = last_console;
 341 }
 342 
 343 static void send_intr(void)
     /*  */
 344 {
 345         if (tty)
 346                 put_queue(INTR_CHAR(tty));
 347 }
 348 
 349 static void do_spec(unsigned char value, char up_flag)
     /*  */
 350 {
 351         typedef void (*fnp)(void);
 352         fnp fn_table[] = {
 353                 NULL,           enter,          show_ptregs,    show_mem,
 354                 show_state,     send_intr,      lastcons,       caps_toggle,
 355                 num,            hold
 356         };
 357 
 358         if (value >= sizeof(fn_table)/sizeof(fnp))
 359                 return;
 360         if (up_flag)
 361                 return;
 362         if (!fn_table[value])
 363                 return;
 364         fn_table[value]();
 365 }
 366   
 367 static void do_self(unsigned char value, char up_flag)
     /*  */
 368 {
 369         if (up_flag)
 370                 return;         /* no action, if this is a key release */
 371 
 372         value = handle_diacr(value);
 373 
 374         /* kludge... */
 375         if (vc_kbd_flag(kbd,VC_CAPSLOCK))
 376                 if ((value >= 'a' && value <= 'z')
 377                     || (value >= 224 && value <= 254)) {
 378                         value -= 32;
 379                 }
 380         /* kludge... */
 381         if (kbd_flags & CTRL_KEYS) {
 382                 if (value >= 64 && value < 127)
 383                         value &= 0x1f;
 384                 else if (value == ' ' || value == '2')
 385                         value = 0;
 386                 else if (value >= '3' && value < '8')
 387                         value -= 24;
 388                 else if (value == '?' || value == '8' || value == '/')
 389                         value = 127;
 390                 else if (value == '-' || value == '_')
 391                         value = 0x1f;
 392                 else
 393                         return;
 394         }
 395 
 396         if (kbd_flags & ALT_KEYS)
 397                 if (vc_kbd_flag(kbd,VC_META)) {
 398                         put_queue('\033');
 399                         put_queue(value);
 400                 } else
 401                         put_queue(value|0x80);
 402         else
 403                 put_queue(value);
 404 }
 405 
 406 static unsigned char ret_diacr[] =
 407         {'`', '\'', '^', '~', '"' };            /* Must not end with 0 */
 408 
 409 /* If a dead key pressed twice, output a character corresponding it,    */
 410 /* otherwise just remember the dead key.                                */
 411 
 412 static void do_dead(unsigned char value, char up_flag)
     /*  */
 413 {
 414         if (up_flag)
 415                 return;
 416 
 417         if (diacr == value) {   /* pressed twice */
 418                 diacr = -1;
 419                 put_queue(ret_diacr[value]);
 420                 return;
 421         }
 422         diacr = value;
 423 }
 424 
 425 /* If no pending dead key, return the character unchanged. Otherwise,   */
 426 /* if space if pressed, return a character corresponding the pending    */
 427 /* dead key, otherwise try to combine the two.                          */
 428 
 429 unsigned int handle_diacr(unsigned int ch)
     /*  */
 430 {
 431         static unsigned char accent_table[5][64] = {
 432         " \300BCD\310FGH\314JKLMN\322PQRST\331VWXYZ[\\]^_"
 433         "`\340bcd\350fgh\354jklmn\362pqrst\371vwxyz{|}~",   /* accent grave */
 434 
 435         " \301BCD\311FGH\315JKLMN\323PQRST\332VWX\335Z[\\]^_"
 436         "`\341bcd\351fgh\355jklmn\363pqrst\372vwx\375z{|}~", /* accent acute */
 437 
 438         " \302BCD\312FGH\316JKLMN\324PQRST\333VWXYZ[\\]^_"
 439         "`\342bcd\352fgh\356jklmn\364pqrst\373vwxyz{|}~",   /* circumflex */
 440 
 441         " \303BCDEFGHIJKLM\321\325PQRSTUVWXYZ[\\]^_"
 442         "`\343bcdefghijklm\361\365pqrstuvwxyz{|}~",         /* tilde */
 443 
 444         " \304BCD\313FGH\317JKLMN\326PQRST\334VWXYZ[\\]^_"
 445         "`\344bcd\353fgh\357jklmn\366pqrst\374vwx\377z{|}~" /* dieresis */
 446         };
 447         int d = diacr, e;
 448 
 449         if (diacr == -1)
 450                 return ch;
 451 
 452         diacr = -1;
 453         if (ch == ' ')
 454                 return ret_diacr[d];
 455 
 456         if (ch >= 64 && ch <= 122) {
 457                 e = accent_table[d][ch - 64];
 458                 if (e != ch)
 459                         return e;
 460         }
 461         put_queue(ret_diacr[d]);
 462         return ch;
 463 }
 464 
 465 static void do_cons(unsigned char value, char up_flag)
     /*  */
 466 {
 467         if (up_flag)
 468                 return;
 469         want_console = value;
 470 }
 471 
 472 static char *func_table[] = {
 473         "\033[[A",  "\033[[B",  "\033[[C",  "\033[[D",  "\033[[E", /* F1 -F5  */
 474         "\033[17~", "\033[18~", "\033[19~", "\033[20~", "\033[21~",/* F6 -F10 */
 475         "\033[23~", "\033[24~", "\033[25~", "\033[26~", "\033[28~",/* F11-F15 */
 476         "\033[29~", "\033[31~", "\033[32~", "\033[33~", "\033[34~",/* F16-F20 */
 477         "\033[1~",      /* Find */
 478         "\033[2~",      /* Insert */
 479         "\033[3~",      /* Remove */
 480         "\033[4~",      /* Select */
 481         "\033[5~",      /* Prev page */
 482         "\033[6~"       /* Next page */
 483 };
 484 
 485 static void do_fn(unsigned char value, char up_flag)
     /*  */
 486 {
 487         if (up_flag)
 488                 return;
 489         if (kbd_flags & SHIFT_KEYS) {
 490                 if (value == KVAL(K_PGDN)) {
 491                         scrollfront(0);
 492                         return;
 493                 }
 494                 if (value == KVAL(K_PGUP)) {
 495                         scrollback(0);
 496                         return;
 497                 }
 498         }
 499         if ((kbd_flags & ALT_KEYS) && value < 12) {
 500                 want_console = value;
 501                 return;
 502         }
 503         puts_queue(func_table[value]);
 504 }
 505 
 506 static void do_pad(unsigned char value, char up_flag)
     /*  */
 507 {
 508         static char *pad_chars = "0123456789+-*/\015,.";
 509         static char *app_map = "pqrstuvwxylSRQMnn";
 510 
 511         if (up_flag)
 512                 return;         /* no action, if this is a key release */
 513 
 514         if ((value == KVAL(K_PCOMMA) || value == KVAL(K_PDOT)) &&
 515             (kbd_flags & CTRL_KEYS) && (kbd_flags & (ALT_KEYS | ALTGR_KEYS))) {
 516                 ctrl_alt_del();
 517                 return;
 518         }
 519 
 520         if ((kbd_flags & ALT_KEYS) && value <= 9) {     /* Alt-numpad */
 521                 npadch = (npadch * 10 + value) % 1000;
 522                 return;
 523         }
 524 
 525         /* kludge... shift forces cursor/number keys */
 526         if (vc_kbd_flag(kbd,VC_APPLIC) && shift_state != 1) {
 527                 applkey(app_map[value], 1);
 528                 return;
 529         }
 530 
 531         if (!vc_kbd_flag(kbd,VC_NUMLOCK))
 532                 switch (value) {
 533                         case KVAL(K_PCOMMA):
 534                         case KVAL(K_PDOT):
 535                                 do_fn(KVAL(K_REMOVE), 0);
 536                                 return;
 537                         case KVAL(K_P0):
 538                                 do_fn(KVAL(K_INSERT), 0);
 539                                 return;
 540                         case KVAL(K_P1):
 541                                 do_fn(KVAL(K_SELECT), 0);
 542                                 return;
 543                         case KVAL(K_P2):
 544                                 do_cur(KVAL(K_DOWN), 0);
 545                                 return;
 546                         case KVAL(K_P3):
 547                                 do_fn(KVAL(K_PGDN), 0);
 548                                 return;
 549                         case KVAL(K_P4):
 550                                 do_cur(KVAL(K_LEFT), 0);
 551                                 return;
 552                         case KVAL(K_P6):
 553                                 do_cur(KVAL(K_RIGHT), 0);
 554                                 return;
 555                         case KVAL(K_P7):
 556                                 do_fn(KVAL(K_FIND), 0);
 557                                 return;
 558                         case KVAL(K_P8):
 559                                 do_cur(KVAL(K_UP), 0);
 560                                 return;
 561                         case KVAL(K_P9):
 562                                 do_fn(KVAL(K_PGUP), 0);
 563                                 return;
 564                         case KVAL(K_P5):
 565                                 applkey('G', vc_kbd_flag(kbd,VC_APPLIC));
 566                                 return;
 567                 }
 568 
 569         put_queue(pad_chars[value]);
 570         if (value == KVAL(K_PENTER) && vc_kbd_flag(kbd,VC_CRLF))
 571                 put_queue(10);
 572 }
 573 
 574 static void do_cur(unsigned char value, char up_flag)
     /*  */
 575 {
 576         static char *cur_chars = "BDCA";
 577         if (up_flag)
 578                 return;
 579 
 580         applkey(cur_chars[value], vc_kbd_flag(kbd,VC_CKMODE));
 581 }
 582 
 583 static void do_shift(unsigned char value, char up_flag)
     /*  */
 584 {
 585         shift_state = 0;
 586         if (up_flag)
 587                 clr_kbd_flag(value);
 588         else
 589                 set_kbd_flag(value);
 590         if (kbd_flags & SHIFT_KEYS)
 591                 shift_state = 1;
 592         if (kbd_flags & ALTGR_KEYS)
 593                 shift_state = 2;
 594         /* cludge */
 595         if (up_flag && value == KG_LALT && npadch != 0) {
 596                 put_queue(npadch);
 597                 npadch=0;
 598         }
 599 }
 600 
 601 #define C(x)            ((KT_CONS<<8)|x)
 602 
 603 u_word key_map[NR_KEYMAPS][NR_KEYS] = {
 604         { /* unshifted keys */
 605         K_HOLE,  27,      '1',     '2',     '3',     '4',     '5',     '6',
 606         '7',     '8',     '9',     '0',     '-',     '=',     127,       9,
 607         'q',     'w',     'e',     'r',     't',     'y',     'u',     'i',
 608         'o',     'p',     '[',     ']', K_ENTER, K_LCTRL,     'a',     's',
 609         'd',     'f',     'g',     'h',     'j',     'k',     'l',     ';',
 610         '\'',    '`',  K_LSHIFT,  '\\',     'z',     'x',     'c',     'v',
 611         'b',     'n',     'm',     ',',     '.',     '/',     K_RSHIFT, K_PSTAR,
 612         K_ALT,   ' ',     K_CAPS,  K_F1,    K_F2,    K_F3,    K_F4,    K_F5,
 613         K_F6,    K_F7,    K_F8,    K_F9,    K_F10,   K_NUM,   K_HOLD,  K_P7,
 614         K_P8,    K_P9,    K_PMINUS, K_P4,   K_P5,    K_P6,    K_PPLUS, K_P1,
 615         K_P2,    K_P3,    K_P0,    K_PDOT, K_CONS, K_HOLE,    '<',    K_F11,
 616         K_F12,   K_HOLE,  K_HOLE,  K_HOLE,  K_HOLE,  K_HOLE,  K_HOLE,  K_HOLE,
 617         /* unshifted e0 keys */
 618         K_PENTER, K_RCTRL, K_PSLASH,    28, K_ALTGR, K_BREAK,  K_FIND,    K_UP,
 619         K_PGUP,   K_LEFT, K_RIGHT, K_SELECT, K_DOWN,  K_PGDN, K_INSERT, K_REMOVE },
 620         { /* shifted keys */
 621          K_HOLE,      27,     '!',     '@',     '#',     '$',     '%',     '^',
 622             '&',     '*',     '(',     ')',     '_',     '+',     127,       9,
 623             'Q',     'W',     'E',     'R',     'T',     'Y',     'U',     'I',
 624             'O',     'P',     '{',     '}', K_ENTER,  K_LCTRL,    'A',     'S',
 625             'D',     'F',     'G',     'H',     'J',     'K',     'L',     ':',
 626             '"',     '~', K_LSHIFT,    '|',     'Z',     'X',     'C',     'V',
 627             'B',     'N',     'M',     '<',     '>',     '?', K_RSHIFT, K_PSTAR,
 628           K_ALT,      32,  K_CAPS,   K_F11,   K_F12,   K_F13,   K_F14,   K_F15,
 629           K_F16,   K_F17,   K_F18,   K_F19,   K_F20,   K_NUM, K_SH_MEM,   K_P7,
 630            K_P8,    K_P9, K_PMINUS,   K_P4,    K_P5,    K_P6, K_PPLUS,    K_P1,
 631            K_P2,    K_P3,    K_P0,  K_PDOT,  K_CONS,  K_HOLE,     '>',   K_F11,
 632           K_F12,  K_HOLE,  K_HOLE,  K_HOLE,  K_HOLE,  K_HOLE,  K_HOLE,  K_HOLE,
 633         /* shifted e0 keys */
 634         K_PENTER, K_RCTRL, K_PSLASH, K_HOLE, K_ALTGR, K_BREAK, K_FIND,  K_UP,
 635         K_PGUP,   K_LEFT, K_RIGHT, K_SELECT, K_DOWN, K_PGDN, K_INSERT, K_REMOVE },
 636         { /* alted keys */
 637          K_HOLE,  K_HOLE,  K_HOLE,     '@',  K_HOLE,     '$',  K_HOLE,  K_HOLE,
 638             '{',     '[',     ']',     '}',    '\\',  K_HOLE,  K_HOLE,  K_HOLE,
 639          K_HOLE,  K_HOLE,  K_HOLE,  K_HOLE,  K_HOLE,  K_HOLE,  K_HOLE,  K_HOLE,
 640          K_HOLE,  K_HOLE,  K_HOLE,     '~', K_ENTER, K_LCTRL,  K_HOLE,  K_HOLE,
 641          K_HOLE,  K_HOLE,  K_HOLE,  K_HOLE,  K_HOLE,  K_HOLE,  K_HOLE,  K_HOLE,
 642          K_HOLE,  K_HOLE, K_LSHIFT, K_HOLE,  K_HOLE,  K_HOLE,  K_HOLE,  K_HOLE,
 643          K_HOLE,  K_HOLE,  K_HOLE,  K_HOLE,  K_HOLE,  K_HOLE, K_RSHIFT, K_HOLE,
 644           K_ALT,  K_HOLE,  K_CAPS,   C(12),   C(13),   C(14),   C(15),   C(16),
 645           C(17),   C(18),   C(19),   C(20),   C(21),   K_NUM, K_SH_REGS,  K_P7,
 646            K_P8,    K_P9, K_PMINUS,   K_P4,    K_P5,    K_P6, K_PPLUS,    K_P1,
 647            K_P2,    K_P3,    K_P0,  K_PDOT,  K_CONS,  K_HOLE,     '|',   C(22),
 648           C(23),  K_HOLE,  K_HOLE,  K_HOLE,  K_HOLE,  K_HOLE,  K_HOLE,  K_HOLE,
 649         /* alted e0 keys */
 650         K_PENTER, K_RCTRL, K_PSLASH, K_HOLE, K_ALTGR, K_BREAK, K_FIND,    K_UP,
 651         K_PGUP,   K_LEFT, K_RIGHT, K_SELECT, K_DOWN, K_PGDN, K_INSERT, K_REMOVE }};
 652 
 653 /*
 654  * send_data sends a character to the keyboard and waits
 655  * for a acknowledge, possibly retrying if asked to. Returns
 656  * the success status.
 657  */
 658 static int send_data(unsigned char data)
     /*  */
 659 {
 660         int retries = 3;
 661         int i;
 662 
 663         do {
 664                 kb_wait();
 665                 acknowledge = 0;
 666                 resend = 0;
 667                 outb_p(data, 0x60);
 668                 for(i=0; i<0x20000; i++) {
 669                         inb_p(0x64);            /* just as a delay */
 670                         if (acknowledge)
 671                                 return 1;
 672                         if (resend)
 673                                 break;
 674                 }
 675                 if (!resend)
 676                         return 0;
 677         } while (retries-- > 0);
 678         return 0;
 679 }
 680 
 681 /*
 682  * This routine is the bottom half of the keyboard interrupt
 683  * routine, and runs with all interrupts enabled. It does
 684  * console changing, led setting and copy_to_cooked, which can
 685  * take a reasonably long time.
 686  *
 687  * Aside from timing (which isn't really that important for
 688  * keyboard interrupts as they happen often), using the software
 689  * interrupt routines for this thing allows us to easily mask
 690  * this when we don't want any of the above to happen. Not yet
 691  * used, but this allows for easy and efficient race-condition
 692  * prevention later on.
 693  */
 694 static void kbd_bh(void * unused)
     /*  */
 695 {
 696         static unsigned char old_leds = 0xff;
 697         unsigned char leds = kbd_table[fg_console].flags & LED_MASK;
 698 
 699         if (leds != old_leds) {
 700                 old_leds = leds;
 701                 if (!send_data(0xed) || !send_data(leds))
 702                         send_data(0xf4);        /* re-enable kbd if any errors */
 703         }
 704         if (want_console >= 0) {
 705                 if (want_console != fg_console) {
 706                         last_console = fg_console;
 707                         change_console(want_console);
 708                 }
 709                 want_console = -1;
 710         }
 711         do_keyboard_interrupt();
 712         cli();
 713         if (inb_p(0x64) & 0x01)
 714                 fake_keyboard_interrupt();
 715         sti();
 716 }
 717 
 718 long no_idt[2] = {0, 0};
 719 
 720 /*
 721  * This routine reboots the machine by asking the keyboard
 722  * controller to pulse the reset-line low. We try that for a while,
 723  * and if it doesn't work, we do some other stupid things.
 724  */
 725 void hard_reset_now(void)
     /*  */
 726 {
 727         int i, j;
 728         extern unsigned long pg0[1024];
 729 
 730         sti();
 731 /* rebooting needs to touch the page at absolute addr 0 */
 732         pg0[0] = 7;
 733         *((unsigned short *)0x472) = 0x1234;
 734         for (;;) {
 735                 for (i=0; i<100; i++) {
 736                         kb_wait();
 737                         for(j = 0; j < 100000 ; j++)
 738                                 /* nothing */;
 739                         outb(0xfe,0x64);         /* pulse reset low */
 740                 }
 741                 __asm__("\tlidt _no_idt");
 742         }
 743 }
 744 
 745 unsigned long kbd_init(unsigned long kmem_start)
     /*  */
 746 {
 747         int i;
 748         struct kbd_struct * kbd;
 749 
 750         kbd = kbd_table + 0;
 751         for (i = 0 ; i < NR_CONSOLES ; i++,kbd++) {
 752                 kbd->flags = KBD_DEFFLAGS;
 753                 kbd->default_flags = KBD_DEFFLAGS;
 754         }
 755         bh_base[KEYBOARD_BH].routine = kbd_bh;
 756         request_irq(KEYBOARD_IRQ,keyboard_interrupt);
 757         mark_bh(KEYBOARD_BH);
 758         return kmem_start;
 759 }
/* */
root/kernel/chr_drv/keyboard.c

DEFINITIONS
