summaryrefslogtreecommitdiffstats
path: root/drivers/tty/vt/consolemap.c
blob: 71e81406ef714033290e73ba472dfbae19b75e46 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
/*
 * consolemap.c
 *
 * Mapping from internal code (such as Latin-1 or Unicode or IBM PC code)
 * to font positions.
 *
 * aeb, 950210
 *
 * Support for multiple unimaps by Jakub Jelinek <jj@ultra.linux.cz>, July 1998
 *
 * Fix bug in inverse translation. Stanislav Voronyi <stas@cnti.uanet.kharkov.ua>, Dec 1998
 *
 * In order to prevent the following circular lock dependency:
 *   &mm->mmap_sem --> cpu_hotplug.lock --> console_lock --> &mm->mmap_sem
 *
 * We cannot allow page fault to happen while holding the console_lock.
 * Therefore, all the userspace copy operations have to be done outside
 * the console_lock critical sections.
 *
 * As all the affected functions are all called directly from vt_ioctl(), we
 * can allocate some small buffers directly on stack without worrying about
 * stack overflow.
 */

#include <linux/module.h>
#include <linux/kd.h>
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/tty.h>
#include <asm/uaccess.h>
#include <linux/console.h>
#include <linux/consolemap.h>
#include <linux/vt_kern.h>
#include <linux/string.h>

static unsigned short translations[][256] = {
  /* 8-bit Latin-1 mapped to Unicode -- trivial mapping */
  {
    0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007,
    0x0008, 0x0009, 0x000a, 0x000b, 0x000c, 0x000d, 0x000e, 0x000f,
    0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0016, 0x0017,
    0x0018, 0x0019, 0x001a, 0x001b, 0x001c, 0x001d, 0x001e, 0x001f,
    0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
    0x0028, 0x0029, 0x002a, 0x002b, 0x002c, 0x002d, 0x002e, 0x002f,
    0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
    0x0038, 0x0039, 0x003a, 0x003b, 0x003c, 0x003d, 0x003e, 0x003f,
    0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
    0x0048, 0x0049, 0x004a, 0x004b, 0x004c, 0x004d, 0x004e, 0x004f,
    0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057,
    0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,
    0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067,
    0x0068, 0x0069, 0x006a, 0x006b, 0x006c, 0x006d, 0x006e, 0x006f,
    0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077,
    0x0078, 0x0079, 0x007a, 0x007b, 0x007c, 0x007d, 0x007e, 0x007f,
    0x0080, 0x0081, 0x0082, 0x0083, 0x0084, 0x0085, 0x0086, 0x0087,
    0x0088, 0x0089, 0x008a, 0x008b, 0x008c, 0x008d, 0x008e, 0x008f,
    0x0090, 0x0091, 0x0092, 0x0093, 0x0094, 0x0095, 0x0096, 0x0097,
    0x0098, 0x0099, 0x009a, 0x009b, 0x009c, 0x009d, 0x009e, 0x009f,
    0x00a0, 0x00a1, 0x00a2, 0x00a3, 0x00a4, 0x00a5, 0x00a6, 0x00a7,
    0x00a8, 0x00a9, 0x00aa, 0x00ab, 0x00ac, 0x00ad, 0x00ae, 0x00af,
    0x00b0, 0x00b1, 0x00b2, 0x00b3, 0x00b4, 0x00b5, 0x00b6, 0x00b7,
    0x00b8, 0x00b9, 0x00ba, 0x00bb, 0x00bc, 0x00bd, 0x00be, 0x00bf,
    0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6, 0x00c7,
    0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce, 0x00cf,
    0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,
    0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,
    0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6, 0x00e7,
    0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,
    0x00f0, 0x00f1, 0x00f2, 0x00f3, 0x00f4, 0x00f5, 0x00f6, 0x00f7,
    0x00f8, 0x00f9, 0x00fa, 0x00fb, 0x00fc, 0x00fd, 0x00fe, 0x00ff
  }, 
  /* VT100 graphics mapped to Unicode */
  {
    0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007,
    0x0008, 0x0009, 0x000a, 0x000b, 0x000c, 0x000d, 0x000e, 0x000f,
    0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0016, 0x0017,
    0x0018, 0x0019, 0x001a, 0x001b, 0x001c, 0x001d, 0x001e, 0x001f,
    0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
    0x0028, 0x0029, 0x002a, 0x2192, 0x2190, 0x2191, 0x2193, 0x002f,
    0x2588, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
    0x0038, 0x0039, 0x003a, 0x003b, 0x003c, 0x003d, 0x003e, 0x003f,
    0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
    0x0048, 0x0049, 0x004a, 0x004b, 0x004c, 0x004d, 0x004e, 0x004f,
    0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057,
    0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x00a0,
    0x25c6, 0x2592, 0x2409, 0x240c, 0x240d, 0x240a, 0x00b0, 0x00b1,
    0x2591, 0x240b, 0x2518, 0x2510, 0x250c, 0x2514, 0x253c, 0x23ba,
    0x23bb, 0x2500, 0x23bc, 0x23bd, 0x251c, 0x2524, 0x2534, 0x252c,
    0x2502, 0x2264, 0x2265, 0x03c0, 0x2260, 0x00a3, 0x00b7, 0x007f,
    0x0080, 0x0081, 0x0082, 0x0083, 0x0084, 0x0085, 0x0086, 0x0087,
    0x0088, 0x0089, 0x008a, 0x008b, 0x008c, 0x008d, 0x008e, 0x008f,
    0x0090, 0x0091, 0x0092, 0x0093, 0x0094, 0x0095, 0x0096, 0x0097,
    0x0098, 0x0099, 0x009a, 0x009b, 0x009c, 0x009d, 0x009e, 0x009f,
    0x00a0, 0x00a1, 0x00a2, 0x00a3, 0x00a4, 0x00a5, 0x00a6, 0x00a7,
    0x00a8, 0x00a9, 0x00aa, 0x00ab, 0x00ac, 0x00ad, 0x00ae, 0x00af,
    0x00b0, 0x00b1, 0x00b2, 0x00b3, 0x00b4, 0x00b5, 0x00b6, 0x00b7,
    0x00b8, 0x00b9, 0x00ba, 0x00bb, 0x00bc, 0x00bd, 0x00be, 0x00bf,
    0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6, 0x00c7,
    0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce, 0x00cf,
    0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,
    0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,
    0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6, 0x00e7,
    0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,
    0x00f0, 0x00f1, 0x00f2, 0x00f3, 0x00f4, 0x00f5, 0x00f6, 0x00f7,
    0x00f8, 0x00f9, 0x00fa, 0x00fb, 0x00fc, 0x00fd, 0x00fe, 0x00ff
  },
  /* IBM Codepage 437 mapped to Unicode */
  {
    0x0000, 0x263a, 0x263b, 0x2665, 0x2666, 0x2663, 0x2660, 0x2022, 
    0x25d8, 0x25cb, 0x25d9, 0x2642, 0x2640, 0x266a, 0x266b, 0x263c,
    0x25b6, 0x25c0, 0x2195, 0x203c, 0x00b6, 0x00a7, 0x25ac, 0x21a8,
    0x2191, 0x2193, 0x2192, 0x2190, 0x221f, 0x2194, 0x25b2, 0x25bc,
    0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
    0x0028, 0x0029, 0x002a, 0x002b, 0x002c, 0x002d, 0x002e, 0x002f,
    0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
    0x0038, 0x0039, 0x003a, 0x003b, 0x003c, 0x003d, 0x003e, 0x003f,
    0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
    0x0048, 0x0049, 0x004a, 0x004b, 0x004c, 0x004d, 0x004e, 0x004f,
    0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057,
    0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,
    0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067,
    0x0068, 0x0069, 0x006a, 0x006b, 0x006c, 0x006d, 0x006e, 0x006f,
    0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077,
    0x0078, 0x0079, 0x007a, 0x007b, 0x007c, 0x007d, 0x007e, 0x2302,
    0x00c7, 0x00fc, 0x00e9, 0x00e2, 0x00e4, 0x00e0, 0x00e5, 0x00e7,
    0x00ea, 0x00eb, 0x00e8, 0x00ef, 0x00ee, 0x00ec, 0x00c4, 0x00c5,
    0x00c9, 0x00e6, 0x00c6, 0x00f4, 0x00f6, 0x00f2, 0x00fb, 0x00f9,
    0x00ff, 0x00d6, 0x00dc, 0x00a2, 0x00a3, 0x00a5, 0x20a7, 0x0192,
    0x00e1, 0x00ed, 0x00f3, 0x00fa, 0x00f1, 0x00d1, 0x00aa, 0x00ba,
    0x00bf, 0x2310, 0x00ac, 0x00bd, 0x00bc, 0x00a1, 0x00ab, 0x00bb,
    0x2591, 0x2592, 0x2593, 0x2502, 0x2524, 0x2561, 0x2562, 0x2556,
    0x2555, 0x2563, 0x2551, 0x2557, 0x255d, 0x255c, 0x255b, 0x2510,
    0x2514, 0x2534, 0x252c, 0x251c, 0x2500, 0x253c, 0x255e, 0x255f,
    0x255a, 0x2554, 0x2569, 0x2566, 0x2560, 0x2550, 0x256c, 0x2567,
    0x2568, 0x2564, 0x2565, 0x2559, 0x2558, 0x2552, 0x2553, 0x256b,
    0x256a, 0x2518, 0x250c, 0x2588, 0x2584, 0x258c, 0x2590, 0x2580,
    0x03b1, 0x00df, 0x0393, 0x03c0, 0x03a3, 0x03c3, 0x00b5, 0x03c4,
    0x03a6, 0x0398, 0x03a9, 0x03b4, 0x221e, 0x03c6, 0x03b5, 0x2229,
    0x2261, 0x00b1, 0x2265, 0x2264, 0x2320, 0x2321, 0x00f7, 0x2248,
    0x00b0, 0x2219, 0x00b7, 0x221a, 0x207f, 0x00b2, 0x25a0, 0x00a0
  }, 
  /* User mapping -- default to codes for direct font mapping */
  {
    0xf000, 0xf001, 0xf002, 0xf003, 0xf004, 0xf005, 0xf006, 0xf007,
    0xf008, 0xf009, 0xf00a, 0xf00b, 0xf00c, 0xf00d, 0xf00e, 0xf00f,
    0xf010, 0xf011, 0xf012, 0xf013, 0xf014, 0xf015, 0xf016, 0xf017,
    0xf018, 0xf019, 0xf01a, 0xf01b, 0xf01c, 0xf01d, 0xf01e, 0xf01f,
    0xf020, 0xf021, 0xf022, 0xf023, 0xf024, 0xf025, 0xf026, 0xf027,
    0xf028, 0xf029, 0xf02a, 0xf02b, 0xf02c, 0xf02d, 0xf02e, 0xf02f,
    0xf030, 0xf031, 0xf032, 0xf033, 0xf034, 0xf035, 0xf036, 0xf037,
    0xf038, 0xf039, 0xf03a, 0xf03b, 0xf03c, 0xf03d, 0xf03e, 0xf03f,
    0xf040, 0xf041, 0xf042, 0xf043, 0xf044, 0xf045, 0xf046, 0xf047,
    0xf048, 0xf049, 0xf04a, 0xf04b, 0xf04c, 0xf04d, 0xf04e, 0xf04f,
    0xf050, 0xf051, 0xf052, 0xf053, 0xf054, 0xf055, 0xf056, 0xf057,
    0xf058, 0xf059, 0xf05a, 0xf05b, 0xf05c, 0xf05d, 0xf05e, 0xf05f,
    0xf060, 0xf061, 0xf062, 0xf063, 0xf064, 0xf065, 0xf066, 0xf067,
    0xf068, 0xf069, 0xf06a, 0xf06b, 0xf06c, 0xf06d, 0xf06e, 0xf06f,
    0xf070, 0xf071, 0xf072, 0xf073, 0xf074, 0xf075, 0xf076, 0xf077,
    0xf078, 0xf079, 0xf07a, 0xf07b, 0xf07c, 0xf07d, 0xf07e, 0xf07f,
    0xf080, 0xf081, 0xf082, 0xf083, 0xf084, 0xf085, 0xf086, 0xf087,
    0xf088, 0xf089, 0xf08a, 0xf08b, 0xf08c, 0xf08d, 0xf08e, 0xf08f,
    0xf090, 0xf091, 0xf092, 0xf093, 0xf094, 0xf095, 0xf096, 0xf097,
    0xf098, 0xf099, 0xf09a, 0xf09b, 0xf09c, 0xf09d, 0xf09e, 0xf09f,
    0xf0a0, 0xf0a1, 0xf0a2, 0xf0a3, 0xf0a4, 0xf0a5, 0xf0a6, 0xf0a7,
    0xf0a8, 0xf0a9, 0xf0aa, 0xf0ab, 0xf0ac, 0xf0ad, 0xf0ae, 0xf0af,
    0xf0b0, 0xf0b1, 0xf0b2, 0xf0b3, 0xf0b4, 0xf0b5, 0xf0b6, 0xf0b7,
    0xf0b8, 0xf0b9, 0xf0ba, 0xf0bb, 0xf0bc, 0xf0bd, 0xf0be, 0xf0bf,
    0xf0c0, 0xf0c1, 0xf0c2, 0xf0c3, 0xf0c4, 0xf0c5, 0xf0c6, 0xf0c7,
    0xf0c8, 0xf0c9, 0xf0ca, 0xf0cb, 0xf0cc, 0xf0cd, 0xf0ce, 0xf0cf,
    0xf0d0, 0xf0d1, 0xf0d2, 0xf0d3, 0xf0d4, 0xf0d5, 0xf0d6, 0xf0d7,
    0xf0d8, 0xf0d9, 0xf0da, 0xf0db, 0xf0dc, 0xf0dd, 0xf0de, 0xf0df,
    0xf0e0, 0xf0e1, 0xf0e2, 0xf0e3, 0xf0e4, 0xf0e5, 0xf0e6, 0xf0e7,
    0xf0e8, 0xf0e9, 0xf0ea, 0xf0eb, 0xf0ec, 0xf0ed, 0xf0ee, 0xf0ef,
    0xf0f0, 0xf0f1, 0xf0f2, 0xf0f3, 0xf0f4, 0xf0f5, 0xf0f6, 0xf0f7,
    0xf0f8, 0xf0f9, 0xf0fa, 0xf0fb, 0xf0fc, 0xf0fd, 0xf0fe, 0xf0ff
  }
};

/* The standard kernel character-to-font mappings are not invertible
   -- this is just a best effort. */

#define MAX_GLYPH 512		/* Max possible glyph value */

static int inv_translate[MAX_NR_CONSOLES];

struct uni_pagedir {
	u16 		**uni_pgdir[32];
	unsigned long	refcount;
	unsigned long	sum;
	unsigned char	*inverse_translations[4];
	u16		*inverse_trans_unicode;
};

static struct uni_pagedir *dflt;

static void set_inverse_transl(struct vc_data *conp, struct uni_pagedir *p, int i)
{
	int j, glyph;
	unsigned short *t = translations[i];
	unsigned char *q;
	
	if (!p) return;
	q = p->inverse_translations[i];

	if (!q) {
		q = p->inverse_translations[i] = kmalloc(MAX_GLYPH, GFP_KERNEL);
		if (!q) return;
	}
	memset(q, 0, MAX_GLYPH);

	for (j = 0; j < E_TABSZ; j++) {
		glyph = conv_uni_to_pc(conp, t[j]);
		if (glyph >= 0 && glyph < MAX_GLYPH && q[glyph] < 32) {
			/* prefer '-' above SHY etc. */
		  	q[glyph] = j;
		}
	}
}

static void set_inverse_trans_unicode(struct vc_data *conp,
				      struct uni_pagedir *p)
{
	int i, j, k, glyph;
	u16 **p1, *p2;
	u16 *q;

	if (!p) return;
	q = p->inverse_trans_unicode;
	if (!q) {
		q = p->inverse_trans_unicode =
			kmalloc(MAX_GLYPH * sizeof(u16), GFP_KERNEL);
		if (!q)
			return;
	}
	memset(q, 0, MAX_GLYPH * sizeof(u16));

	for (i = 0; i < 32; i++) {
		p1 = p->uni_pgdir[i];
		if (!p1)
			continue;
		for (j = 0; j < 32; j++) {
			p2 = p1[j];
			if (!p2)
				continue;
			for (k = 0; k < 64; k++) {
				glyph = p2[k];
				if (glyph >= 0 && glyph < MAX_GLYPH
					       && q[glyph] < 32)
		  			q[glyph] = (i << 11) + (j << 6) + k;
			}
		}
	}
}

unsigned short *set_translate(int m, struct vc_data *vc)
{
	inv_translate[vc->vc_num] = m;
	return translations[m];
}

/*
 * Inverse translation is impossible for several reasons:
 * 1. The font<->character maps are not 1-1.
 * 2. The text may have been written while a different translation map
 *    was active.
 * Still, it is now possible to a certain extent to cut and paste non-ASCII.
 */
u16 inverse_translate(struct vc_data *conp, int glyph, int use_unicode)
{
	struct uni_pagedir *p;
	int m;
	if (glyph < 0 || glyph >= MAX_GLYPH)
		return 0;
	else {
		p = *conp->vc_uni_pagedir_loc;
		if (!p)
			return glyph;
		else if (use_unicode) {
			if (!p->inverse_trans_unicode)
				return glyph;
			else
				return p->inverse_trans_unicode[glyph];
			} else {
			m = inv_translate[conp->vc_num];
			if (!p->inverse_translations[m])
				return glyph;
			else
				return p->inverse_translations[m][glyph];
			}
	}
}
EXPORT_SYMBOL_GPL(inverse_translate);

static void update_user_maps(void)
{
	int i;
	struct uni_pagedir *p, *q = NULL;
	
	for (i = 0; i < MAX_NR_CONSOLES; i++) {
		if (!vc_cons_allocated(i))
			continue;
		p = *vc_cons[i].d->vc_uni_pagedir_loc;
		if (p && p != q) {
			set_inverse_transl(vc_cons[i].d, p, USER_MAP);
			set_inverse_trans_unicode(vc_cons[i].d, p);
			q = p;
		}
	}
}

/*
 * Load customizable translation table
 * arg points to a 256 byte translation table.
 *
 * The "old" variants are for translation directly to font (using the
 * 0xf000-0xf0ff "transparent" Unicodes) whereas the "new" variants set
 * Unicodes explicitly.
 */
int con_set_trans_old(unsigned char __user * arg)
{
	int i;
	unsigned short inbuf[E_TABSZ];

	if (!access_ok(VERIFY_READ, arg, E_TABSZ))
		return -EFAULT;

	for (i = 0; i < E_TABSZ ; i++) {
		unsigned char uc;
		__get_user(uc, arg+i);
		inbuf[i] = UNI_DIRECT_BASE | uc;
	}

	console_lock();
	memcpy(translations[USER_MAP], inbuf, sizeof(inbuf));
	update_user_maps();
	console_unlock();
	return 0;
}

int con_get_trans_old(unsigned char __user * arg)
{
	int i, ch;
	unsigned short *p = translations[USER_MAP];
	unsigned char outbuf[E_TABSZ];

	if (!access_ok(VERIFY_WRITE, arg, E_TABSZ))
		return -EFAULT;

	console_lock();
	for (i = 0; i < E_TABSZ ; i++)
	{
		ch = conv_uni_to_pc(vc_cons[fg_console].d, p[i]);
		outbuf[i] = (ch & ~0xff) ? 0 : ch;
	}
	console_unlock();

	for (i = 0; i < E_TABSZ ; i++)
		__put_user(outbuf[i], arg+i);
	return 0;
}

int con_set_trans_new(ushort __user * arg)
{
	int i;
	unsigned short inbuf[E_TABSZ];

	if (!access_ok(VERIFY_READ, arg, E_TABSZ*sizeof(unsigned short)))
		return -EFAULT;

	for (i = 0; i < E_TABSZ ; i++)
		__get_user(inbuf[i], arg+i);

	console_lock();
	memcpy(translations[USER_MAP], inbuf, sizeof(inbuf));
	update_user_maps();
	console_unlock();
	return 0;
}

int con_get_trans_new(ushort __user * arg)
{
	int i;
	unsigned short outbuf[E_TABSZ];

	if (!access_ok(VERIFY_WRITE, arg, E_TABSZ*sizeof(unsigned short)))
		return -EFAULT;

	console_lock();
	memcpy(outbuf, translations[USER_MAP], sizeof(outbuf));
	console_unlock();

	for (i = 0; i < E_TABSZ ; i++)
		__put_user(outbuf[i], arg+i);
	return 0;
}

/*
 * Unicode -> current font conversion 
 *
 * A font has at most 512 chars, usually 256.
 * But one font position may represent several Unicode chars.
 * A hashtable is somewhat of a pain to deal with, so use a
 * "paged table" instead.  Simulation has shown the memory cost of
 * this 3-level paged table scheme to be comparable to a hash table.
 */

extern u8 dfont_unicount[];	/* Defined in console_defmap.c */
extern u16 dfont_unitable[];

static void con_release_unimap(struct uni_pagedir *p)
{
	u16 **p1;
	int i, j;

	if (p == dflt) dflt = NULL;  
	for (i = 0; i < 32; i++) {
		p1 = p->uni_pgdir[i];
		if (p1 != NULL) {
			for (j = 0; j < 32; j++)
				kfree(p1[j]);
			kfree(p1);
		}
		p->uni_pgdir[i] = NULL;
	}
	for (i = 0; i < 4; i++) {
		kfree(p->inverse_translations[i]);
		p->inverse_translations[i] = NULL;
	}
	kfree(p->inverse_trans_unicode);
	p->inverse_trans_unicode = NULL;
}

/* Caller must hold the console lock */
void con_free_unimap(struct vc_data *vc)
{
	struct uni_pagedir *p;

	p = *vc->vc_uni_pagedir_loc;
	if (!p)
		return;
	*vc->vc_uni_pagedir_loc = NULL;
	if (--p->refcount)
		return;
	con_release_unimap(p);
	kfree(p);
}
  
static int con_unify_unimap(struct vc_data *conp, struct uni_pagedir *p)
{
	int i, j, k;
	struct uni_pagedir *q;
	
	for (i = 0; i < MAX_NR_CONSOLES; i++) {
		if (!vc_cons_allocated(i))
			continue;
		q = *vc_cons[i].d->vc_uni_pagedir_loc;
		if (!q || q == p || q->sum != p->sum)
			continue;
		for (j = 0; j < 32; j++) {
			u16 **p1, **q1;
			p1 = p->uni_pgdir[j]; q1 = q->uni_pgdir[j];
			if (!p1 && !q1)
				continue;
			if (!p1 || !q1)
				break;
			for (k = 0; k < 32; k++) {
				if (!p1[k] && !q1[k])
					continue;
				if (!p1[k] || !q1[k])
					break;
				if (memcmp(p1[k], q1[k], 64*sizeof(u16)))
					break;
			}
			if (k < 32)
				break;
		}
		if (j == 32) {
			q->refcount++;
			*conp->vc_uni_pagedir_loc = q;
			con_release_unimap(p);
			kfree(p);
			return 1;
		}
	}
	return 0;
}

static int
con_insert_unipair(struct uni_pagedir *p, u_short unicode, u_short fontpos)
{
	int i, n;
	u16 **p1, *p2;

	p1 = p->uni_pgdir[n = unicode >> 11];
	if (!p1) {
		p1 = p->uni_pgdir[n] = kmalloc(32*sizeof(u16 *), GFP_KERNEL);
		if (!p1) return -ENOMEM;
		for (i = 0; i < 32; i++)
			p1[i] = NULL;
	}

	p2 = p1[n = (unicode >> 6) & 0x1f];
	if (!p2) {
		p2 = p1[n] = kmalloc(64*sizeof(u16), GFP_KERNEL);
		if (!p2) return -ENOMEM;
		memset(p2, 0xff, 64*sizeof(u16)); /* No glyphs for the characters (yet) */
	}

	p2[unicode & 0x3f] = fontpos;
	
	p->sum += (fontpos << 20) + unicode;

	return 0;
}

/* Caller must hold the lock */
static int con_do_clear_unimap(struct vc_data *vc)
{
	struct uni_pagedir *p, *q;

	p = *vc->vc_uni_pagedir_loc;
	if (!p || --p->refcount) {
		q = kzalloc(sizeof(*p), GFP_KERNEL);
		if (!q) {
			if (p)
				p->refcount++;
			return -ENOMEM;
		}
		q->refcount=1;
		*vc->vc_uni_pagedir_loc = q;
	} else {
		if (p == dflt) dflt = NULL;
		p->refcount++;
		p->sum = 0;
		con_release_unimap(p);
	}
	return 0;
}

int con_clear_unimap(struct vc_data *vc)
{
	int ret;
	console_lock();
	ret = con_do_clear_unimap(vc);
	console_unlock();
	return ret;
}
	
int con_set_unimap(struct vc_data *vc, ushort ct, struct unipair __user *list)
{
	int err = 0, err1, i;
	struct uni_pagedir *p, *q;
	struct unipair *unilist, *plist;

	if (!ct)
		return 0;

	unilist = kmalloc_array(ct, sizeof(struct unipair), GFP_KERNEL);
	if (!unilist)
		return -ENOMEM;

	for (i = ct, plist = unilist; i; i--, plist++, list++) {
		__get_user(plist->unicode, &list->unicode);
		__get_user(plist->fontpos, &list->fontpos);
	}

	console_lock();

	/* Save original vc_unipagdir_loc in case we allocate a new one */
	p = *vc->vc_uni_pagedir_loc;

	if (!p) {
		err = -EINVAL;

		goto out_unlock;
	}
	
	if (p->refcount > 1) {
		int j, k;
		u16 **p1, *p2, l;
		
		err1 = con_do_clear_unimap(vc);
		if (err1) {
			err = err1;
			goto out_unlock;
		}
		
		/*
		 * Since refcount was > 1, con_clear_unimap() allocated a
		 * a new uni_pagedir for this vc.  Re: p != q
		 */
		q = *vc->vc_uni_pagedir_loc;

		/*
		 * uni_pgdir is a 32*32*64 table with rows allocated
		 * when its first entry is added.  The unicode value must
		 * still be incremented for empty rows.  We are copying
		 * entries from "p" (old) to "q" (new).
		 */
		l = 0;		/* unicode value */
		for (i = 0; i < 32; i++) {
		p1 = p->uni_pgdir[i];
		if (p1)
			for (j = 0; j < 32; j++) {
			p2 = p1[j];
			if (p2) {
				for (k = 0; k < 64; k++, l++)
				if (p2[k] != 0xffff) {
					/*
					 * Found one, copy entry for unicode
					 * l with fontpos value p2[k].
					 */
					err1 = con_insert_unipair(q, l, p2[k]);
					if (err1) {
						p->refcount++;
						*vc->vc_uni_pagedir_loc = p;
						con_release_unimap(q);
						kfree(q);
						err = err1;
						goto out_unlock;
					}
				}
			} else {
				/* Account for row of 64 empty entries */
				l += 64;
			}
		}
		else
			/* Account for empty table */
			l += 32 * 64;
		}

		/*
		 * Finished copying font table, set vc_uni_pagedir to new table
		 */
		p = q;
	} else if (p == dflt) {
		dflt = NULL;
	}

	/*
	 * Insert user specified unicode pairs into new table.
	 */
	for (plist = unilist; ct; ct--, plist++) {
		err1 = con_insert_unipair(p, plist->unicode, plist->fontpos);
		if (err1)
			err = err1;
	}
	
	/*
	 * Merge with fontmaps of any other virtual consoles.
	 */
	if (con_unify_unimap(vc, p))
		goto out_unlock;

	for (i = 0; i <= 3; i++)
		set_inverse_transl(vc, p, i); /* Update inverse translations */
	set_inverse_trans_unicode(vc, p);

out_unlock:
	console_unlock();
	kfree(unilist);
	return err;
}

/**
 *	con_set_default_unimap	-	set default unicode map
 *	@vc: the console we are updating
 *
 *	Loads the unimap for the hardware font, as defined in uni_hash.tbl.
 *	The representation used was the most compact I could come up
 *	with.  This routine is executed at video setup, and when the
 *	PIO_FONTRESET ioctl is called. 
 *
 *	The caller must hold the console lock
 */
int con_set_default_unimap(struct vc_data *vc)
{
	int i, j, err = 0, err1;
	u16 *q;
	struct uni_pagedir *p;

	if (dflt) {
		p = *vc->vc_uni_pagedir_loc;
		if (p == dflt)
			return 0;

		dflt->refcount++;
		*vc->vc_uni_pagedir_loc = dflt;
		if (p && !--p->refcount) {
			con_release_unimap(p);
			kfree(p);
		}
		return 0;
	}
	
	/* The default font is always 256 characters */

	err = con_do_clear_unimap(vc);
	if (err)
		return err;
    
	p = *vc->vc_uni_pagedir_loc;
	q = dfont_unitable;
	
	for (i = 0; i < 256; i++)
		for (j = dfont_unicount[i]; j; j--) {
			err1 = con_insert_unipair(p, *(q++), i);
			if (err1)
				err = err1;
		}
			
	if (con_unify_unimap(vc, p)) {
		dflt = *vc->vc_uni_pagedir_loc;
		return err;
	}

	for (i = 0; i <= 3; i++)
		set_inverse_transl(vc, p, i);	/* Update all inverse translations */
	set_inverse_trans_unicode(vc, p);
	dflt = p;
	return err;
}
EXPORT_SYMBOL(con_set_default_unimap);

/**
 *	con_copy_unimap		-	copy unimap between two vts
 *	@dst_vc: target
 *	@src_vt: source
 *
 *	The caller must hold the console lock when invoking this method
 */
int con_copy_unimap(struct vc_data *dst_vc, struct vc_data *src_vc)
{
	struct uni_pagedir *q;

	if (!*src_vc->vc_uni_pagedir_loc)
		return -EINVAL;
	if (*dst_vc->vc_uni_pagedir_loc == *src_vc->vc_uni_pagedir_loc)
		return 0;
	con_free_unimap(dst_vc);
	q = *src_vc->vc_uni_pagedir_loc;
	q->refcount++;
	*dst_vc->vc_uni_pagedir_loc = q;
	return 0;
}
EXPORT_SYMBOL(con_copy_unimap);

/**
 *	con_get_unimap		-	get the unicode map
 *	@vc: the console to read from
 *
 *	Read the console unicode data for this console. Called from the ioctl
 *	handlers.
 */
int con_get_unimap(struct vc_data *vc, ushort ct, ushort __user *uct, struct unipair __user *list)
{
	int i, j, k;
	ushort ect;
	u16 **p1, *p2;
	struct uni_pagedir *p;
	struct unipair *unilist, *plist;

	unilist = kmalloc_array(ct, sizeof(struct unipair), GFP_KERNEL);
	if (!unilist)
		return -ENOMEM;

	console_lock();

	ect = 0;
	if (*vc->vc_uni_pagedir_loc) {
		p = *vc->vc_uni_pagedir_loc;
		for (i = 0; i < 32; i++) {
		p1 = p->uni_pgdir[i];
		if (p1)
			for (j = 0; j < 32; j++) {
			p2 = *(p1++);
			if (p2)
				for (k = 0; k < 64; k++, p2++) {
					if (*p2 >= MAX_GLYPH)
						continue;
					if (ect < ct) {
						unilist[ect].unicode =
							(i<<11)+(j<<6)+k;
						unilist[ect].fontpos = *p2;
					}
					ect++;
				}
			}
		}
	}
	console_unlock();
	for (i = min(ect, ct), plist = unilist; i; i--, list++, plist++) {
		__put_user(plist->unicode, &list->unicode);
		__put_user(plist->fontpos, &list->fontpos);
	}
	__put_user(ect, uct);
	kfree(unilist);
	return ((ect <= ct) ? 0 : -ENOMEM);
}

/*
 * Always use USER_MAP. These functions are used by the keyboard,
 * which shouldn't be affected by G0/G1 switching, etc.
 * If the user map still contains default values, i.e. the
 * direct-to-font mapping, then assume user is using Latin1.
 *
 * FIXME: at some point we need to decide if we want to lock the table
 * update element itself via the keyboard_event_lock for consistency with the
 * keyboard driver as well as the consoles
 */
/* may be called during an interrupt */
u32 conv_8bit_to_uni(unsigned char c)
{
	unsigned short uni = translations[USER_MAP][c];
	return uni == (0xf000 | c) ? c : uni;
}

int conv_uni_to_8bit(u32 uni)
{
	int c;
	for (c = 0; c < 0x100; c++)
		if (translations[USER_MAP][c] == uni ||
		   (translations[USER_MAP][c] == (c | 0xf000) && uni == c))
			return c;
	return -1;
}

int
conv_uni_to_pc(struct vc_data *conp, long ucs) 
{
	int h;
	u16 **p1, *p2;
	struct uni_pagedir *p;
  
	/* Only 16-bit codes supported at this time */
	if (ucs > 0xffff)
		return -4;		/* Not found */
	else if (ucs < 0x20)
		return -1;		/* Not a printable character */
	else if (ucs == 0xfeff || (ucs >= 0x200b && ucs <= 0x200f))
		return -2;			/* Zero-width space */
	/*
	 * UNI_DIRECT_BASE indicates the start of the region in the User Zone
	 * which always has a 1:1 mapping to the currently loaded font.  The
	 * UNI_DIRECT_MASK indicates the bit span of the region.
	 */
	else if ((ucs & ~UNI_DIRECT_MASK) == UNI_DIRECT_BASE)
		return ucs & UNI_DIRECT_MASK;
  
	if (!*conp->vc_uni_pagedir_loc)
		return -3;

	p = *conp->vc_uni_pagedir_loc;
	if ((p1 = p->uni_pgdir[ucs >> 11]) &&
	    (p2 = p1[(ucs >> 6) & 0x1f]) &&
	    (h = p2[ucs & 0x3f]) < MAX_GLYPH)
		return h;

	return -4;		/* not found */
}

/*
 * This is called at sys_setup time, after memory and the console are
 * initialized.  It must be possible to call kmalloc(..., GFP_KERNEL)
 * from this function, hence the call from sys_setup.
 */
void __init 
console_map_init(void)
{
	int i;
	
	for (i = 0; i < MAX_NR_CONSOLES; i++)
		if (vc_cons_allocated(i) && !*vc_cons[i].d->vc_uni_pagedir_loc)
			con_set_default_unimap(vc_cons[i].d);
}