source: rtems/c/src/lib/libbsp/i386/pc386/console/keyboard.c @ 4977f07e

4.11
Last change on this file since 4977f07e was 4977f07e, checked in by Joel Sherrill <joel.sherrill@…>, on Oct 9, 2014 at 5:56:18 PM

i386/pc386: Eliminate multiple warnings

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File size: 19.6 KB
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1/*
2 *   Rosimildo da Silva:  rdasilva@connecttel.com
3 */
4
5#include <limits.h>
6#include <sys/types.h>
7#include <rtems/keyboard.h>
8#include "i386kbd.h"
9#include <rtems/kd.h>
10#include <bsp.h>
11#include <bsp/bootcard.h>
12
13#define SIZE(x) (sizeof(x)/sizeof((x)[0]))
14
15#ifndef KBD_DEFMODE
16#define KBD_DEFMODE ((1 << VC_REPEAT) | (1 << VC_META))
17#endif
18
19#ifndef KBD_DEFLEDS
20/*
21 * Some laptops take the 789uiojklm,. keys as number pad when NumLock
22 * is on. This seems a good reason to start with NumLock off.
23 */
24#define KBD_DEFLEDS 0
25#endif
26
27#ifndef KBD_DEFLOCK
28#define KBD_DEFLOCK 0
29#endif
30
31static int set_bit(int nr, unsigned long * addr)
32{
33  int                   mask;
34  int                   retval;
35  rtems_interrupt_level level;
36
37  addr += nr >> 5;
38  mask = 1 << (nr & 0x1f);
39  rtems_interrupt_disable(level);
40    retval = (mask & *addr) != 0;
41    *addr |= mask;
42  rtems_interrupt_enable(level);
43  return retval;
44}
45
46static int clear_bit(int nr, unsigned long * addr)
47{
48  int                   mask;
49  int                   retval;
50  rtems_interrupt_level level;
51
52  addr += nr >> 5;
53  mask = 1 << (nr & 0x1f);
54  rtems_interrupt_disable(level);
55    retval = (mask & *addr) != 0;
56    *addr &= ~mask;
57  rtems_interrupt_enable(level);
58  return retval;
59}
60
61static int test_bit(int nr, unsigned long * addr)
62{
63  int  mask;
64
65  addr += nr >> 5;
66  mask = 1 << (nr & 0x1f);
67  return ((mask & *addr) != 0);
68}
69
70#define  test_and_set_bit(x,y)      set_bit(x,y)
71#define  test_and_clear_bit(x,y)    clear_bit(x,y)
72
73/*
74 * global state includes the following, and various static variables
75 * in this module: prev_scancode, shift_state, diacr, npadch, dead_key_next.
76 * (last_console is now a global variable)
77 */
78#define  BITS_PER_LONG (sizeof(long)*CHAR_BIT)
79
80/* shift state counters.. */
81static unsigned char k_down[NR_SHIFT] = {0, };
82/* keyboard key bitmap */
83static unsigned long key_down[256/BITS_PER_LONG] = { 0, };
84
85static int dead_key_next = 0;
86/*
87 * In order to retrieve the shift_state (for the mouse server), either
88 * the variable must be global, or a new procedure must be created to
89 * return the value. I chose the former way.
90 */
91int shift_state = 0;
92static int npadch = -1;      /* -1 or number assembled on pad */
93static unsigned char diacr = 0;
94static char rep = 0;      /* flag telling character repeat */
95
96/* default console for RTEMS */
97static int  fg_console = 0;
98
99struct kbd_struct kbd_table[MAX_NR_CONSOLES];
100static struct kbd_struct * kbd = kbd_table;
101
102void compute_shiftstate(void);
103
104typedef void (*k_hand)(unsigned char value, char up_flag);
105typedef void (k_handfn)(unsigned char value, char up_flag);
106
107static k_handfn
108  do_self, do_fn, do_spec, do_pad, do_dead, do_cons, do_cur, do_shift,
109  do_meta, do_ascii, do_lock, do_lowercase, do_slock, do_dead2,
110  do_ignore;
111
112static k_hand key_handler[16] = {
113  do_self, do_fn, do_spec, do_pad, do_dead, do_cons, do_cur, do_shift,
114  do_meta, do_ascii, do_lock, do_lowercase, do_slock, do_dead2,
115  do_ignore, do_ignore
116};
117
118/* Key types processed even in raw modes */
119
120#define TYPES_ALLOWED_IN_RAW_MODE ((1 << KT_SPEC) | (1 << KT_SHIFT))
121
122typedef void (*void_fnp)(void);
123typedef void (void_fn)(void);
124
125static void show_mem(void)
126{
127}
128static void show_state(void)
129{
130}
131
132static void_fn do_null, enter, show_ptregs, send_intr, lastcons, caps_toggle,
133  num, hold, scroll_forw, scroll_back, caps_on, compose,
134  SAK, decr_console, incr_console, spawn_console, bare_num;
135
136static void_fnp spec_fn_table[] = {
137  do_null,  enter,    show_ptregs,  show_mem,
138  show_state,  send_intr,  lastcons,  caps_toggle,
139  num,    hold,    scroll_forw,  scroll_back,
140  bsp_reset,  caps_on,  compose,  SAK,
141  decr_console,  incr_console,  spawn_console,  bare_num
142};
143
144#define SPECIALS_ALLOWED_IN_RAW_MODE (1 << KVAL(K_SAK))
145
146/* maximum values each key_handler can handle */
147const int max_vals[] = {
148  255, SIZE(func_table) - 1, SIZE(spec_fn_table) - 1, NR_PAD - 1,
149  NR_DEAD - 1, 255, 3, NR_SHIFT - 1,
150  255, NR_ASCII - 1, NR_LOCK - 1, 255,
151  NR_LOCK - 1, 255
152};
153
154const int NR_TYPES = SIZE(max_vals);
155
156/* N.B. drivers/macintosh/mac_keyb.c needs to call put_queue */
157static void put_queue(int);
158static unsigned char handle_diacr(unsigned char);
159
160#ifdef CONFIG_MAGIC_SYSRQ
161static int sysrq_pressed;
162#endif
163
164/*
165 * Many other routines do put_queue, but I think either
166 * they produce ASCII, or they produce some user-assigned
167 * string, and in both cases we might assume that it is
168 * in utf-8 already.
169 */
170static void to_utf8(ushort c)
171{
172  if (c < 0x80)
173    put_queue(c);                  /*  0*******  */
174  else if (c < 0x800) {
175    put_queue(0xc0 | (c >> 6));    /*  110***** 10******  */
176    put_queue(0x80 | (c & 0x3f));
177  } else {
178    put_queue(0xe0 | (c >> 12));   /*  1110**** 10****** 10******  */
179    put_queue(0x80 | ((c >> 6) & 0x3f));
180    put_queue(0x80 | (c & 0x3f));
181  }
182  /* UTF-8 is defined for words of up to 31 bits,
183     but we need only 16 bits here */
184}
185
186/*
187 * Translation of escaped scancodes to keycodes.
188 * This is now user-settable (for machines were it makes sense).
189 */
190
191int setkeycode(unsigned int scancode, unsigned int keycode)
192{
193    return kbd_setkeycode(scancode, keycode);
194}
195
196int getkeycode(unsigned int scancode)
197{
198    return kbd_getkeycode(scancode);
199}
200
201void handle_scancode(unsigned char scancode, int down)
202{
203  unsigned char keycode;
204  char up_flag = down ? 0 : 0200;
205  char raw_mode;
206
207  mark_bh(CONSOLE_BH);
208
209#if 0
210  tty = ttytab? ttytab[fg_console]: NULL;
211  if (tty && (!tty->driver_data)) {
212    /*
213     * We touch the tty structure via the the ttytab array
214     * without knowing whether or not tty is open, which
215     * is inherently dangerous.  We currently rely on that
216     * fact that console_open sets tty->driver_data when
217     * it opens it, and clears it when it closes it.
218     */
219    tty = NULL;
220  }
221#endif
222
223  kbd = kbd_table + fg_console;
224  if ((raw_mode = (kbd->kbdmode == VC_RAW))) {
225    put_queue(scancode | up_flag);
226    /* we do not return yet, because we want to maintain
227       the key_down array, so that we have the correct
228       values when finishing RAW mode or when changing VT's */
229  }
230
231  /*
232   *  Convert scancode to keycode
233   */
234  if (!kbd_translate(scancode, &keycode, raw_mode))
235      return;
236
237  /*
238   * At this point the variable `keycode' contains the keycode.
239   * Note: the keycode must not be 0 (++Geert: on m68k 0 is valid).
240   * We keep track of the up/down status of the key, and
241   * return the keycode if in MEDIUMRAW mode.
242   */
243
244  if (up_flag) {
245    rep = 0;
246    if(!test_and_clear_bit(keycode, key_down))
247        up_flag = kbd_unexpected_up(keycode);
248  } else
249    rep = test_and_set_bit(keycode, key_down);
250
251#ifdef CONFIG_MAGIC_SYSRQ    /* Handle the SysRq Hack */
252  if (keycode == SYSRQ_KEY) {
253    sysrq_pressed = !up_flag;
254    return;
255  } else if (sysrq_pressed) {
256    if (!up_flag && sysrq_enabled)
257      handle_sysrq(kbd_sysrq_xlate[keycode], kbd_pt_regs, kbd, tty);
258    return;
259  }
260#endif
261
262  if (kbd->kbdmode == VC_MEDIUMRAW) {
263    /* soon keycodes will require more than one byte */
264    put_queue(keycode + up_flag);
265    raw_mode = 1;  /* Most key classes will be ignored */
266  }
267  /*
268   * Small change in philosophy: earlier we defined repetition by
269   *   rep = keycode == prev_keycode;
270   *   prev_keycode = keycode;
271   * but now by the fact that the depressed key was down already.
272   * Does this ever make a difference? Yes.
273   */
274
275  /*
276   *  Repeat a key only if the input buffers are empty or the
277   *  characters get echoed locally. This makes key repeat usable
278   *  with slow applications and under heavy loads.
279   */
280  if (!rep || vc_kbd_mode(kbd,VC_REPEAT) ) {
281/*
282  ||  (vc_kbd_mode(kbd,VC_REPEAT) && tty &&
283       (L_ECHO(tty) || (tty->driver.chars_in_buffer(tty) == 0)))) {
284*/
285    u_short keysym;
286    u_char type;
287
288    /* the XOR below used to be an OR */
289    int shift_final = shift_state ^ kbd->lockstate ^ kbd->slockstate;
290    ushort *key_map = key_maps[shift_final];
291
292    if (key_map != NULL) {
293      keysym = key_map[keycode];
294      type = KTYP(keysym);
295
296      if (type >= 0xf0) {
297          type -= 0xf0;
298          if (raw_mode && ! (TYPES_ALLOWED_IN_RAW_MODE & (1 << type)))
299        return;
300         if (type == KT_LETTER) {
301        type = KT_LATIN;
302        if (vc_kbd_led(kbd, VC_CAPSLOCK)) {
303            key_map = key_maps[shift_final ^ (1<<KG_SHIFT)];
304            if (key_map)
305              keysym = key_map[keycode];
306        }
307          }
308
309          (*key_handler[type])(keysym & 0xff, up_flag);
310
311          if (type != KT_SLOCK)
312            kbd->slockstate = 0;
313
314      } else {
315          /* maybe only if (kbd->kbdmode == VC_UNICODE) ? */
316          if (!up_flag && !raw_mode)
317            to_utf8(keysym);
318      }
319    } else {
320      /* maybe beep? */
321      /* we have at least to update shift_state */
322#if 1      /* how? two almost equivalent choices follow */
323      compute_shiftstate();
324#else
325      keysym = U(plain_map[keycode]);
326      type = KTYP(keysym);
327      if (type == KT_SHIFT)
328        (*key_handler[type])(keysym & 0xff, up_flag);
329#endif
330    }
331  }
332}
333
334static void ( *driver_input_handler_kbd )( void *, unsigned short, unsigned long ) = 0;
335/*
336 */
337void kbd_set_driver_handler(
338  void ( *handler )( void *, unsigned short, unsigned long )
339)
340{
341  driver_input_handler_kbd = handler;
342}
343
344static void put_queue(int ch)
345{
346  if ( driver_input_handler_kbd ) {
347    driver_input_handler_kbd(  ( void *)kbd, (unsigned short)ch,  0 );
348  } else {
349    add_to_queue( ch );
350  }
351}
352
353static void puts_queue(char *cp)
354{
355  while (*cp) {
356     put_queue( *cp );
357    cp++;
358  }
359}
360
361static void applkey(int key, char mode)
362{
363  static char buf[] = { 0x1b, 'O', 0x00, 0x00 };
364
365  buf[1] = (mode ? 'O' : '[');
366  buf[2] = key;
367  puts_queue(buf);
368}
369
370static void enter(void)
371{
372  if (diacr) {
373    put_queue(diacr);
374    diacr = 0;
375  }
376  put_queue(13);
377
378  if (vc_kbd_mode(kbd,VC_CRLF))
379    put_queue(10);
380}
381
382static void caps_toggle(void)
383{
384  if (rep)
385    return;
386  chg_vc_kbd_led(kbd, VC_CAPSLOCK);
387}
388
389static void caps_on(void)
390{
391  if (rep)
392    return;
393  set_vc_kbd_led(kbd, VC_CAPSLOCK);
394}
395
396static void show_ptregs(void)
397{
398}
399
400static void hold(void)
401{
402  if (rep )
403    return;
404   chg_vc_kbd_led(kbd, VC_SCROLLOCK );
405}
406
407static void num(void)
408{
409  if (vc_kbd_mode(kbd,VC_APPLIC))
410    applkey('P', 1);
411  else
412    bare_num();
413}
414
415/*
416 * Bind this to Shift-NumLock if you work in application keypad mode
417 * but want to be able to change the NumLock flag.
418 * Bind this to NumLock if you prefer that the NumLock key always
419 * changes the NumLock flag.
420 */
421static void bare_num(void)
422{
423  if (!rep)
424    chg_vc_kbd_led(kbd,VC_NUMLOCK);
425}
426
427static void lastcons(void)
428{
429}
430
431static void decr_console(void)
432{
433}
434
435static void incr_console(void)
436{
437}
438
439static void send_intr(void)
440{
441}
442
443static void scroll_forw(void)
444{
445}
446
447static void scroll_back(void)
448{
449}
450
451static void compose(void)
452{
453  dead_key_next = 1;
454}
455
456int spawnpid, spawnsig;
457
458static void spawn_console(void)
459{
460}
461
462static void SAK(void)
463{
464}
465
466static void do_ignore(unsigned char value, char up_flag)
467{
468}
469
470static void do_null()
471{
472  compute_shiftstate();
473}
474
475static void do_spec(unsigned char value, char up_flag)
476{
477  if (up_flag)
478    return;
479  if (value >= SIZE(spec_fn_table))
480    return;
481
482  if ((kbd->kbdmode == VC_RAW || kbd->kbdmode == VC_MEDIUMRAW) &&
483      !(SPECIALS_ALLOWED_IN_RAW_MODE & (1 << value)))
484    return;
485
486  spec_fn_table[value]();
487}
488
489static void do_lowercase(unsigned char value, char up_flag)
490{
491}
492
493static void do_self(unsigned char value, char up_flag)
494{
495  if (up_flag)
496    return;    /* no action, if this is a key release */
497
498  if (diacr)
499    value = handle_diacr(value);
500
501  if (dead_key_next) {
502    dead_key_next = 0;
503    diacr = value;
504    return;
505  }
506  put_queue(value);
507}
508
509#define A_GRAVE  '`'
510#define A_ACUTE  '\''
511#define A_CFLEX  '^'
512#define A_TILDE  '~'
513#define A_DIAER  '"'
514#define A_CEDIL  ','
515static unsigned char ret_diacr[NR_DEAD] =
516  {A_GRAVE, A_ACUTE, A_CFLEX, A_TILDE, A_DIAER, A_CEDIL };
517
518/* Obsolete - for backwards compatibility only */
519static void do_dead(unsigned char value, char up_flag)
520{
521  value = ret_diacr[value];
522   printk( " do_dead( %X ) ", value );
523  do_dead2(value,up_flag);
524}
525
526/*
527 * Handle dead key. Note that we now may have several
528 * dead keys modifying the same character. Very useful
529 * for Vietnamese.
530 */
531static void do_dead2(unsigned char value, char up_flag)
532{
533  if (up_flag)
534    return;
535  diacr = (diacr ? handle_diacr(value) : value);
536}
537
538/*
539 * We have a combining character DIACR here, followed by the character CH.
540 * If the combination occurs in the table, return the corresponding value.
541 * Otherwise, if CH is a space or equals DIACR, return DIACR.
542 * Otherwise, conclude that DIACR was not combining after all,
543 * queue it and return CH.
544 */
545unsigned char handle_diacr(unsigned char ch)
546{
547  int d = diacr;
548  int i;
549
550  diacr = 0;
551
552  for (i = 0; i < accent_table_size; i++) {
553    if (accent_table[i].diacr == d && accent_table[i].base == ch)
554      return accent_table[i].result;
555  }
556  if (ch == ' ' || ch == d)
557    return d;
558
559  put_queue(d);
560  return ch;
561}
562
563static void do_cons(unsigned char value, char up_flag)
564{
565  if (up_flag)
566    return;
567}
568
569static void do_fn(unsigned char value, char up_flag)
570{
571  if (up_flag)
572    return;
573
574  if (value < SIZE(func_table)) {
575    if (func_table[value])
576      puts_queue(func_table[value]);
577  } else
578    printk( "do_fn called with value=%d\n", value);
579}
580
581static void do_pad(unsigned char value, char up_flag)
582{
583  static const char *pad_chars = "0123456789+-*/\015,.?()";
584  static const char *app_map = "pqrstuvwxylSRQMnnmPQ";
585
586  if (up_flag)
587    return;    /* no action, if this is a key release */
588
589  /* kludge... shift forces cursor/number keys */
590  if (vc_kbd_mode(kbd,VC_APPLIC) && !k_down[KG_SHIFT]) {
591    applkey(app_map[value], 1);
592    return;
593  }
594  if (!vc_kbd_led(kbd,VC_NUMLOCK))
595    switch (value) {
596      case KVAL(K_PCOMMA):
597      case KVAL(K_PDOT):
598        do_fn(KVAL(K_REMOVE), 0);
599        return;
600      case KVAL(K_P0):
601        do_fn(KVAL(K_INSERT), 0);
602        return;
603      case KVAL(K_P1):
604        do_fn(KVAL(K_SELECT), 0);
605        return;
606      case KVAL(K_P2):
607        do_cur(KVAL(K_DOWN), 0);
608        return;
609      case KVAL(K_P3):
610        do_fn(KVAL(K_PGDN), 0);
611        return;
612      case KVAL(K_P4):
613        do_cur(KVAL(K_LEFT), 0);
614        return;
615      case KVAL(K_P6):
616        do_cur(KVAL(K_RIGHT), 0);
617        return;
618      case KVAL(K_P7):
619        do_fn(KVAL(K_FIND), 0);
620        return;
621      case KVAL(K_P8):
622        do_cur(KVAL(K_UP), 0);
623        return;
624      case KVAL(K_P9):
625        do_fn(KVAL(K_PGUP), 0);
626        return;
627      case KVAL(K_P5):
628        applkey('G', vc_kbd_mode(kbd, VC_APPLIC));
629        return;
630    }
631
632  put_queue(pad_chars[value]);
633
634  if (value == KVAL(K_PENTER) && vc_kbd_mode(kbd, VC_CRLF))
635    put_queue(10);
636
637}
638
639static void do_cur(unsigned char value, char up_flag)
640{
641  static const char *cur_chars = "BDCA";
642  if (up_flag)
643    return;
644
645  applkey(cur_chars[value], vc_kbd_mode(kbd,VC_CKMODE));
646}
647
648static void do_shift(unsigned char value, char up_flag)
649{
650  int old_state = shift_state;
651
652  if (rep)
653    return;
654
655  /* Mimic typewriter:
656     a CapsShift key acts like Shift but undoes CapsLock */
657  if (value == KVAL(K_CAPSSHIFT)) {
658    value = KVAL(K_SHIFT);
659    if (!up_flag)
660      clr_vc_kbd_led(kbd, VC_CAPSLOCK);
661  }
662
663  if (up_flag) {
664    /* handle the case that two shift or control
665       keys are depressed simultaneously */
666    if (k_down[value])
667      k_down[value]--;
668  } else
669    k_down[value]++;
670
671  if (k_down[value])
672    shift_state |= (1 << value);
673  else
674    shift_state &= ~ (1 << value);
675
676  /* kludge */
677  if (up_flag && shift_state != old_state && npadch != -1) {
678    if (kbd->kbdmode == VC_UNICODE)
679      to_utf8(npadch & 0xffff);
680    else
681     put_queue(npadch & 0xff);
682    npadch = -1;
683  }
684}
685
686/* called after returning from RAW mode or when changing consoles -
687   recompute k_down[] and shift_state from key_down[] */
688/* maybe called when keymap is undefined, so that shiftkey release is seen */
689void compute_shiftstate(void)
690{
691  int i, j, k, sym, val;
692
693  shift_state = 0;
694  for(i=0; i < SIZE(k_down); i++)
695    k_down[i] = 0;
696
697  for(i=0; i < SIZE(key_down); i++)
698    if(key_down[i]) {  /* skip this word if not a single bit on */
699      k = i*BITS_PER_LONG;
700      for(j=0; j<BITS_PER_LONG; j++,k++)
701        if(test_bit(k, key_down)) {
702    sym = U(plain_map[k]);
703    if(KTYP(sym) == KT_SHIFT) {
704      val = KVAL(sym);
705      if (val == KVAL(K_CAPSSHIFT))
706        val = KVAL(K_SHIFT);
707      k_down[val]++;
708      shift_state |= (1<<val);
709    }
710        }
711    }
712}
713
714static void do_meta(unsigned char value, char up_flag)
715{
716  if (up_flag)
717    return;
718
719  if (vc_kbd_mode(kbd, VC_META)) {
720    put_queue('\033');
721    put_queue(value);
722  } else
723    put_queue(value | 0x80);
724}
725
726static void do_ascii(unsigned char value, char up_flag)
727{
728  int base;
729
730  if (up_flag)
731    return;
732
733  if (value < 10)    /* decimal input of code, while Alt depressed */
734      base = 10;
735  else {       /* hexadecimal input of code, while AltGr depressed */
736      value -= 10;
737      base = 16;
738  }
739
740  if (npadch == -1)
741    npadch = value;
742  else
743    npadch = npadch * base + value;
744}
745
746static void do_lock(unsigned char value, char up_flag)
747{
748  if (up_flag || rep)
749    return;
750  chg_vc_kbd_lock(kbd, value);
751}
752
753static void do_slock(unsigned char value, char up_flag)
754{
755  if (up_flag || rep)
756    return;
757
758  chg_vc_kbd_slock(kbd, value);
759}
760
761/*
762 * The leds display either (i) the status of NumLock, CapsLock, ScrollLock,
763 * or (ii) whatever pattern of lights people want to show using KDSETLED,
764 * or (iii) specified bits of specified words in kernel memory.
765 */
766
767static unsigned char ledstate = 0xff; /* undefined */
768static unsigned char ledioctl;
769
770unsigned char getledstate(void) {
771  return ledstate;
772}
773
774void setledstate(struct kbd_struct *kbd, unsigned int led) {
775  if (!(led & ~7)) {
776    ledioctl = led;
777     kbd->ledmode = LED_SHOW_IOCTL;
778  } else
779    ;
780  kbd->ledmode = LED_SHOW_FLAGS;
781  set_leds();
782}
783
784static struct ledptr {
785  unsigned int *addr;
786  unsigned int mask;
787  unsigned char valid:1;
788} ledptrs[3];
789
790void register_leds(
791  int console,
792  unsigned int led,
793  unsigned int *addr,
794  unsigned int mask
795)
796{
797  struct kbd_struct *kbd = kbd_table + console;
798
799  if (led < 3) {
800    ledptrs[led].addr = addr;
801    ledptrs[led].mask = mask;
802    ledptrs[led].valid = 1;
803    kbd->ledmode = LED_SHOW_MEM;
804  } else
805    kbd->ledmode = LED_SHOW_FLAGS;
806}
807
808static inline unsigned char getleds(void)
809{
810
811    struct kbd_struct *kbd = kbd_table + fg_console;
812
813    unsigned char leds;
814
815    if (kbd->ledmode == LED_SHOW_IOCTL)
816      return ledioctl;
817    leds = kbd->ledflagstate;
818    if (kbd->ledmode == LED_SHOW_MEM) {
819  if (ledptrs[0].valid) {
820      if (*ledptrs[0].addr & ledptrs[0].mask)
821        leds |= 1;
822      else
823        leds &= ~1;
824  }
825  if (ledptrs[1].valid) {
826      if (*ledptrs[1].addr & ledptrs[1].mask)
827        leds |= 2;
828      else
829        leds &= ~2;
830  }
831  if (ledptrs[2].valid) {
832      if (*ledptrs[2].addr & ledptrs[2].mask)
833        leds |= 4;
834      else
835        leds &= ~4;
836  }
837    }
838   return leds;
839}
840
841/*
842 * This routine is the bottom half of the keyboard interrupt
843 * routine, and runs with all interrupts enabled. It does
844 * console changing, led setting and copy_to_cooked, which can
845 * take a reasonably long time.
846 *
847 * Aside from timing (which isn't really that important for
848 * keyboard interrupts as they happen often), using the software
849 * interrupt routines for this thing allows us to easily mask
850 * this when we don't want any of the above to happen. Not yet
851 * used, but this allows for easy and efficient race-condition
852 * prevention later on.
853 */
854static void kbd_bh(void)
855{
856  unsigned char leds = getleds();
857  if (leds != ledstate) {
858    ledstate = leds;
859    kbd_leds(leds);
860  }
861}
862
863void set_leds(void)
864{
865  kbd_bh();
866}
867
868int kbd_init(void)
869{
870
871  int i;
872  struct kbd_struct kbd0;
873  kbd0.ledflagstate = kbd0.default_ledflagstate = KBD_DEFLEDS;
874   kbd0.ledmode = LED_SHOW_MEM;
875  kbd0.lockstate = KBD_DEFLOCK;
876  kbd0.slockstate = 0;
877  kbd0.modeflags = KBD_DEFMODE;
878  kbd0.kbdmode = VC_XLATE;
879
880  for (i = 0 ; i < MAX_NR_CONSOLES ; i++)
881    kbd_table[i] = kbd0;
882
883  kbd_init_hw();
884  mark_bh(KEYBOARD_BH);
885  return 0;
886}
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