aboutsummaryrefslogtreecommitdiff
path: root/hw/input/pckbd.c
blob: 6338a7525a8c03e1d521d01f4288fe22f5beeb5e (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
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
/*
 * QEMU PC keyboard emulation
 *
 * Copyright (c) 2003 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "qemu/osdep.h"
#include "qemu/error-report.h"
#include "qemu/log.h"
#include "qemu/timer.h"
#include "qapi/error.h"
#include "hw/isa/isa.h"
#include "migration/vmstate.h"
#include "hw/acpi/acpi_aml_interface.h"
#include "hw/input/ps2.h"
#include "hw/irq.h"
#include "hw/input/i8042.h"
#include "hw/qdev-properties.h"
#include "system/reset.h"
#include "system/runstate.h"

#include "trace.h"

/* Keyboard Controller Commands */

/* Read mode bits */
#define KBD_CCMD_READ_MODE         0x20
/* Write mode bits */
#define KBD_CCMD_WRITE_MODE        0x60
/* Get controller version */
#define KBD_CCMD_GET_VERSION       0xA1
/* Disable mouse interface */
#define KBD_CCMD_MOUSE_DISABLE     0xA7
/* Enable mouse interface */
#define KBD_CCMD_MOUSE_ENABLE      0xA8
/* Mouse interface test */
#define KBD_CCMD_TEST_MOUSE        0xA9
/* Controller self test */
#define KBD_CCMD_SELF_TEST         0xAA
/* Keyboard interface test */
#define KBD_CCMD_KBD_TEST          0xAB
/* Keyboard interface disable */
#define KBD_CCMD_KBD_DISABLE       0xAD
/* Keyboard interface enable */
#define KBD_CCMD_KBD_ENABLE        0xAE
/* read input port */
#define KBD_CCMD_READ_INPORT       0xC0
/* read output port */
#define KBD_CCMD_READ_OUTPORT      0xD0
/* write output port */
#define KBD_CCMD_WRITE_OUTPORT     0xD1
#define KBD_CCMD_WRITE_OBUF        0xD2
/* Write to output buffer as if initiated by the auxiliary device */
#define KBD_CCMD_WRITE_AUX_OBUF    0xD3
/* Write the following byte to the mouse */
#define KBD_CCMD_WRITE_MOUSE       0xD4
/* HP vectra only ? */
#define KBD_CCMD_DISABLE_A20       0xDD
/* HP vectra only ? */
#define KBD_CCMD_ENABLE_A20        0xDF
/* Pulse bits 3-0 of the output port P2. */
#define KBD_CCMD_PULSE_BITS_3_0    0xF0
/* Pulse bit 0 of the output port P2 = CPU reset. */
#define KBD_CCMD_RESET             0xFE
/* Pulse no bits of the output port P2. */
#define KBD_CCMD_NO_OP             0xFF

/* Status Register Bits */

/* Keyboard output buffer full */
#define KBD_STAT_OBF           0x01
/* Keyboard input buffer full */
#define KBD_STAT_IBF           0x02
/* Self test successful */
#define KBD_STAT_SELFTEST      0x04
/* Last write was a command write (0=data) */
#define KBD_STAT_CMD           0x08
/* Zero if keyboard locked */
#define KBD_STAT_UNLOCKED      0x10
/* Mouse output buffer full */
#define KBD_STAT_MOUSE_OBF     0x20
/* General receive/xmit timeout */
#define KBD_STAT_GTO           0x40
/* Parity error */
#define KBD_STAT_PERR          0x80

/* Controller Mode Register Bits */

/* Keyboard data generate IRQ1 */
#define KBD_MODE_KBD_INT       0x01
/* Mouse data generate IRQ12 */
#define KBD_MODE_MOUSE_INT     0x02
/* The system flag (?) */
#define KBD_MODE_SYS           0x04
/* The keylock doesn't affect the keyboard if set */
#define KBD_MODE_NO_KEYLOCK    0x08
/* Disable keyboard interface */
#define KBD_MODE_DISABLE_KBD   0x10
/* Disable mouse interface */
#define KBD_MODE_DISABLE_MOUSE 0x20
/* Scan code conversion to PC format */
#define KBD_MODE_KCC           0x40
#define KBD_MODE_RFU           0x80

/* Output Port Bits */
#define KBD_OUT_RESET           0x01    /* 1=normal mode, 0=reset */
#define KBD_OUT_A20             0x02    /* x86 only */
#define KBD_OUT_OBF             0x10    /* Keyboard output buffer full */
#define KBD_OUT_MOUSE_OBF       0x20    /* Mouse output buffer full */

/*
 * OSes typically write 0xdd/0xdf to turn the A20 line off and on.
 * We make the default value of the outport include these four bits,
 * so that the subsection is rarely necessary.
 */
#define KBD_OUT_ONES            0xcc

#define KBD_PENDING_KBD_COMPAT  0x01
#define KBD_PENDING_AUX_COMPAT  0x02
#define KBD_PENDING_CTRL_KBD    0x04
#define KBD_PENDING_CTRL_AUX    0x08
#define KBD_PENDING_KBD         KBD_MODE_DISABLE_KBD    /* 0x10 */
#define KBD_PENDING_AUX         KBD_MODE_DISABLE_MOUSE  /* 0x20 */

#define KBD_MIGR_TIMER_PENDING  0x1

#define KBD_OBSRC_KBD           0x01
#define KBD_OBSRC_MOUSE         0x02
#define KBD_OBSRC_CTRL          0x04


/*
 * XXX: not generating the irqs if KBD_MODE_DISABLE_KBD is set may be
 * incorrect, but it avoids having to simulate exact delays
 */
static void kbd_update_irq_lines(KBDState *s)
{
    int irq_kbd_level, irq_mouse_level;

    irq_kbd_level = 0;
    irq_mouse_level = 0;

    if (s->status & KBD_STAT_OBF) {
        if (s->status & KBD_STAT_MOUSE_OBF) {
            if (s->mode & KBD_MODE_MOUSE_INT) {
                irq_mouse_level = 1;
            }
        } else {
            if ((s->mode & KBD_MODE_KBD_INT) &&
                !(s->mode & KBD_MODE_DISABLE_KBD)) {
                irq_kbd_level = 1;
            }
        }
    }
    qemu_set_irq(s->irqs[I8042_KBD_IRQ], irq_kbd_level);
    qemu_set_irq(s->irqs[I8042_MOUSE_IRQ], irq_mouse_level);
}

static void kbd_deassert_irq(KBDState *s)
{
    s->status &= ~(KBD_STAT_OBF | KBD_STAT_MOUSE_OBF);
    s->outport &= ~(KBD_OUT_OBF | KBD_OUT_MOUSE_OBF);
    kbd_update_irq_lines(s);
}

static uint8_t kbd_pending(KBDState *s)
{
    if (s->extended_state) {
        return s->pending & (~s->mode | ~(KBD_PENDING_KBD | KBD_PENDING_AUX));
    } else {
        return s->pending;
    }
}

/* update irq and KBD_STAT_[MOUSE_]OBF */
static void kbd_update_irq(KBDState *s)
{
    uint8_t pending = kbd_pending(s);

    s->status &= ~(KBD_STAT_OBF | KBD_STAT_MOUSE_OBF);
    s->outport &= ~(KBD_OUT_OBF | KBD_OUT_MOUSE_OBF);
    if (pending) {
        s->status |= KBD_STAT_OBF;
        s->outport |= KBD_OUT_OBF;
        if (pending & KBD_PENDING_CTRL_KBD) {
            s->obsrc = KBD_OBSRC_CTRL;
        } else if (pending & KBD_PENDING_CTRL_AUX) {
            s->status |= KBD_STAT_MOUSE_OBF;
            s->outport |= KBD_OUT_MOUSE_OBF;
            s->obsrc = KBD_OBSRC_CTRL;
        } else if (pending & KBD_PENDING_KBD) {
            s->obsrc = KBD_OBSRC_KBD;
        } else {
            s->status |= KBD_STAT_MOUSE_OBF;
            s->outport |= KBD_OUT_MOUSE_OBF;
            s->obsrc = KBD_OBSRC_MOUSE;
        }
    }
    kbd_update_irq_lines(s);
}

static void kbd_safe_update_irq(KBDState *s)
{
    /*
     * with KBD_STAT_OBF set, a call to kbd_read_data() will eventually call
     * kbd_update_irq()
     */
    if (s->status & KBD_STAT_OBF) {
        return;
    }
    /* the throttle timer is pending and will call kbd_update_irq() */
    if (s->throttle_timer && timer_pending(s->throttle_timer)) {
        return;
    }
    if (kbd_pending(s)) {
        kbd_update_irq(s);
    }
}

static void kbd_update_kbd_irq(void *opaque, int level)
{
    KBDState *s = opaque;

    if (level) {
        s->pending |= KBD_PENDING_KBD;
    } else {
        s->pending &= ~KBD_PENDING_KBD;
    }
    kbd_safe_update_irq(s);
}

static void kbd_update_aux_irq(void *opaque, int level)
{
    KBDState *s = opaque;

    if (level) {
        s->pending |= KBD_PENDING_AUX;
    } else {
        s->pending &= ~KBD_PENDING_AUX;
    }
    kbd_safe_update_irq(s);
}

static void kbd_throttle_timeout(void *opaque)
{
    KBDState *s = opaque;

    if (kbd_pending(s)) {
        kbd_update_irq(s);
    }
}

static uint64_t kbd_read_status(void *opaque, hwaddr addr,
                                unsigned size)
{
    KBDState *s = opaque;
    int val;
    val = s->status;
    trace_pckbd_kbd_read_status(val);
    return val;
}

static void kbd_queue(KBDState *s, int b, int aux)
{
    if (s->extended_state) {
        s->cbdata = b;
        s->pending &= ~KBD_PENDING_CTRL_KBD & ~KBD_PENDING_CTRL_AUX;
        s->pending |= aux ? KBD_PENDING_CTRL_AUX : KBD_PENDING_CTRL_KBD;
        kbd_safe_update_irq(s);
    } else {
        ps2_queue(aux ? PS2_DEVICE(&s->ps2mouse) : PS2_DEVICE(&s->ps2kbd), b);
    }
}

static uint8_t kbd_dequeue(KBDState *s)
{
    uint8_t b = s->cbdata;

    s->pending &= ~KBD_PENDING_CTRL_KBD & ~KBD_PENDING_CTRL_AUX;
    if (kbd_pending(s)) {
        kbd_update_irq(s);
    }
    return b;
}

static void outport_write(KBDState *s, uint32_t val)
{
    trace_pckbd_outport_write(val);
    s->outport = val;
    qemu_set_irq(s->a20_out, (val >> 1) & 1);
    if (!(val & 1)) {
        qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
    }
}

static void kbd_write_command(void *opaque, hwaddr addr,
                              uint64_t val, unsigned size)
{
    KBDState *s = opaque;

    trace_pckbd_kbd_write_command(val);

    /*
     * Bits 3-0 of the output port P2 of the keyboard controller may be pulsed
     * low for approximately 6 micro seconds. Bits 3-0 of the KBD_CCMD_PULSE
     * command specify the output port bits to be pulsed.
     * 0: Bit should be pulsed. 1: Bit should not be modified.
     * The only useful version of this command is pulsing bit 0,
     * which does a CPU reset.
     */
    if ((val & KBD_CCMD_PULSE_BITS_3_0) == KBD_CCMD_PULSE_BITS_3_0) {
        if (!(val & 1)) {
            val = KBD_CCMD_RESET;
        } else {
            val = KBD_CCMD_NO_OP;
        }
    }

    switch (val) {
    case KBD_CCMD_READ_MODE:
        kbd_queue(s, s->mode, 0);
        break;
    case KBD_CCMD_WRITE_MODE:
    case KBD_CCMD_WRITE_OBUF:
    case KBD_CCMD_WRITE_AUX_OBUF:
    case KBD_CCMD_WRITE_MOUSE:
    case KBD_CCMD_WRITE_OUTPORT:
        s->write_cmd = val;
        break;
    case KBD_CCMD_MOUSE_DISABLE:
        s->mode |= KBD_MODE_DISABLE_MOUSE;
        break;
    case KBD_CCMD_MOUSE_ENABLE:
        s->mode &= ~KBD_MODE_DISABLE_MOUSE;
        kbd_safe_update_irq(s);
        break;
    case KBD_CCMD_TEST_MOUSE:
        kbd_queue(s, 0x00, 0);
        break;
    case KBD_CCMD_SELF_TEST:
        s->status |= KBD_STAT_SELFTEST;
        kbd_queue(s, 0x55, 0);
        break;
    case KBD_CCMD_KBD_TEST:
        kbd_queue(s, 0x00, 0);
        break;
    case KBD_CCMD_KBD_DISABLE:
        s->mode |= KBD_MODE_DISABLE_KBD;
        break;
    case KBD_CCMD_KBD_ENABLE:
        s->mode &= ~KBD_MODE_DISABLE_KBD;
        kbd_safe_update_irq(s);
        break;
    case KBD_CCMD_READ_INPORT:
        kbd_queue(s, 0x80, 0);
        break;
    case KBD_CCMD_READ_OUTPORT:
        kbd_queue(s, s->outport, 0);
        break;
    case KBD_CCMD_ENABLE_A20:
        qemu_irq_raise(s->a20_out);
        s->outport |= KBD_OUT_A20;
        break;
    case KBD_CCMD_DISABLE_A20:
        qemu_irq_lower(s->a20_out);
        s->outport &= ~KBD_OUT_A20;
        break;
    case KBD_CCMD_RESET:
        qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET);
        break;
    case KBD_CCMD_NO_OP:
        /* ignore that */
        break;
    default:
        qemu_log_mask(LOG_GUEST_ERROR,
                      "unsupported keyboard cmd=0x%02" PRIx64 "\n", val);
        break;
    }
}

static uint64_t kbd_read_data(void *opaque, hwaddr addr,
                              unsigned size)
{
    KBDState *s = opaque;

    if (s->status & KBD_STAT_OBF) {
        kbd_deassert_irq(s);
        if (s->obsrc & KBD_OBSRC_KBD) {
            if (s->throttle_timer) {
                timer_mod(s->throttle_timer,
                          qemu_clock_get_us(QEMU_CLOCK_VIRTUAL) + 1000);
            }
            s->obdata = ps2_read_data(PS2_DEVICE(&s->ps2kbd));
        } else if (s->obsrc & KBD_OBSRC_MOUSE) {
            s->obdata = ps2_read_data(PS2_DEVICE(&s->ps2mouse));
        } else if (s->obsrc & KBD_OBSRC_CTRL) {
            s->obdata = kbd_dequeue(s);
        }
    }

    trace_pckbd_kbd_read_data(s->obdata);
    return s->obdata;
}

static void kbd_write_data(void *opaque, hwaddr addr,
                           uint64_t val, unsigned size)
{
    KBDState *s = opaque;

    trace_pckbd_kbd_write_data(val);

    switch (s->write_cmd) {
    case 0:
        ps2_write_keyboard(&s->ps2kbd, val);
        /* sending data to the keyboard reenables PS/2 communication */
        s->mode &= ~KBD_MODE_DISABLE_KBD;
        kbd_safe_update_irq(s);
        break;
    case KBD_CCMD_WRITE_MODE:
        s->mode = val;
        ps2_keyboard_set_translation(&s->ps2kbd,
                                     (s->mode & KBD_MODE_KCC) != 0);
        /*
         * a write to the mode byte interrupt enable flags directly updates
         * the irq lines
         */
        kbd_update_irq_lines(s);
        /*
         * a write to the mode byte disable interface flags may raise
         * an irq if there is pending data in the PS/2 queues.
         */
        kbd_safe_update_irq(s);
        break;
    case KBD_CCMD_WRITE_OBUF:
        kbd_queue(s, val, 0);
        break;
    case KBD_CCMD_WRITE_AUX_OBUF:
        kbd_queue(s, val, 1);
        break;
    case KBD_CCMD_WRITE_OUTPORT:
        outport_write(s, val);
        break;
    case KBD_CCMD_WRITE_MOUSE:
        ps2_write_mouse(&s->ps2mouse, val);
        /* sending data to the mouse reenables PS/2 communication */
        s->mode &= ~KBD_MODE_DISABLE_MOUSE;
        kbd_safe_update_irq(s);
        break;
    default:
        break;
    }
    s->write_cmd = 0;
}

static void kbd_reset(void *opaque)
{
    KBDState *s = opaque;

    s->mode = KBD_MODE_KBD_INT | KBD_MODE_MOUSE_INT;
    s->status = KBD_STAT_CMD | KBD_STAT_UNLOCKED;
    s->outport = KBD_OUT_RESET | KBD_OUT_A20 | KBD_OUT_ONES;
    s->pending = 0;
    kbd_deassert_irq(s);
    if (s->throttle_timer) {
        timer_del(s->throttle_timer);
    }
}

static uint8_t kbd_outport_default(KBDState *s)
{
    return KBD_OUT_RESET | KBD_OUT_A20 | KBD_OUT_ONES
           | (s->status & KBD_STAT_OBF ? KBD_OUT_OBF : 0)
           | (s->status & KBD_STAT_MOUSE_OBF ? KBD_OUT_MOUSE_OBF : 0);
}

static int kbd_outport_post_load(void *opaque, int version_id)
{
    KBDState *s = opaque;
    s->outport_present = true;
    return 0;
}

static bool kbd_outport_needed(void *opaque)
{
    KBDState *s = opaque;
    return s->outport != kbd_outport_default(s);
}

static const VMStateDescription vmstate_kbd_outport = {
    .name = "pckbd_outport",
    .version_id = 1,
    .minimum_version_id = 1,
    .post_load = kbd_outport_post_load,
    .needed = kbd_outport_needed,
    .fields = (const VMStateField[]) {
        VMSTATE_UINT8(outport, KBDState),
        VMSTATE_END_OF_LIST()
    }
};

static int kbd_extended_state_pre_save(void *opaque)
{
    KBDState *s = opaque;

    s->migration_flags = 0;
    if (s->throttle_timer && timer_pending(s->throttle_timer)) {
        s->migration_flags |= KBD_MIGR_TIMER_PENDING;
    }

    return 0;
}

static int kbd_extended_state_post_load(void *opaque, int version_id)
{
    KBDState *s = opaque;

    if (s->migration_flags & KBD_MIGR_TIMER_PENDING) {
        kbd_throttle_timeout(s);
    }
    s->extended_state_loaded = true;

    return 0;
}

static bool kbd_extended_state_needed(void *opaque)
{
    KBDState *s = opaque;

    return s->extended_state;
}

static const VMStateDescription vmstate_kbd_extended_state = {
    .name = "pckbd/extended_state",
    .post_load = kbd_extended_state_post_load,
    .pre_save = kbd_extended_state_pre_save,
    .needed = kbd_extended_state_needed,
    .fields = (const VMStateField[]) {
        VMSTATE_UINT32(migration_flags, KBDState),
        VMSTATE_UINT32(obsrc, KBDState),
        VMSTATE_UINT8(obdata, KBDState),
        VMSTATE_UINT8(cbdata, KBDState),
        VMSTATE_END_OF_LIST()
    }
};

static int kbd_pre_save(void *opaque)
{
    KBDState *s = opaque;

    if (s->extended_state) {
        s->pending_tmp = s->pending;
    } else {
        s->pending_tmp = 0;
        if (s->pending & KBD_PENDING_KBD) {
            s->pending_tmp |= KBD_PENDING_KBD_COMPAT;
        }
        if (s->pending & KBD_PENDING_AUX) {
            s->pending_tmp |= KBD_PENDING_AUX_COMPAT;
        }
    }
    return 0;
}

static int kbd_pre_load(void *opaque)
{
    KBDState *s = opaque;

    s->outport_present = false;
    s->extended_state_loaded = false;
    return 0;
}

static int kbd_post_load(void *opaque, int version_id)
{
    KBDState *s = opaque;
    if (!s->outport_present) {
        s->outport = kbd_outport_default(s);
    }
    s->pending = s->pending_tmp;
    if (!s->extended_state_loaded) {
        s->obsrc = s->status & KBD_STAT_OBF ?
            (s->status & KBD_STAT_MOUSE_OBF ? KBD_OBSRC_MOUSE : KBD_OBSRC_KBD) :
            0;
        if (s->pending & KBD_PENDING_KBD_COMPAT) {
            s->pending |= KBD_PENDING_KBD;
        }
        if (s->pending & KBD_PENDING_AUX_COMPAT) {
            s->pending |= KBD_PENDING_AUX;
        }
    }
    /* clear all unused flags */
    s->pending &= KBD_PENDING_CTRL_KBD | KBD_PENDING_CTRL_AUX |
                  KBD_PENDING_KBD | KBD_PENDING_AUX;
    return 0;
}

static const VMStateDescription vmstate_kbd = {
    .name = "pckbd",
    .version_id = 3,
    .minimum_version_id = 3,
    .pre_load = kbd_pre_load,
    .post_load = kbd_post_load,
    .pre_save = kbd_pre_save,
    .fields = (const VMStateField[]) {
        VMSTATE_UINT8(write_cmd, KBDState),
        VMSTATE_UINT8(status, KBDState),
        VMSTATE_UINT8(mode, KBDState),
        VMSTATE_UINT8(pending_tmp, KBDState),
        VMSTATE_END_OF_LIST()
    },
    .subsections = (const VMStateDescription * const []) {
        &vmstate_kbd_outport,
        &vmstate_kbd_extended_state,
        NULL
    }
};

/* Memory mapped interface */
static uint64_t kbd_mm_readfn(void *opaque, hwaddr addr, unsigned size)
{
    KBDState *s = opaque;

    if (addr & s->mask) {
        return kbd_read_status(s, 0, 1) & 0xff;
    } else {
        return kbd_read_data(s, 0, 1) & 0xff;
    }
}

static void kbd_mm_writefn(void *opaque, hwaddr addr,
                           uint64_t value, unsigned size)
{
    KBDState *s = opaque;

    if (addr & s->mask) {
        kbd_write_command(s, 0, value & 0xff, 1);
    } else {
        kbd_write_data(s, 0, value & 0xff, 1);
    }
}


static const MemoryRegionOps i8042_mmio_ops = {
    .read = kbd_mm_readfn,
    .write = kbd_mm_writefn,
    .valid.min_access_size = 1,
    .valid.max_access_size = 4,
    .endianness = DEVICE_NATIVE_ENDIAN,
};

static void i8042_mmio_set_kbd_irq(void *opaque, int n, int level)
{
    MMIOKBDState *s = I8042_MMIO(opaque);
    KBDState *ks = &s->kbd;

    kbd_update_kbd_irq(ks, level);
}

static void i8042_mmio_set_mouse_irq(void *opaque, int n, int level)
{
    MMIOKBDState *s = I8042_MMIO(opaque);
    KBDState *ks = &s->kbd;

    kbd_update_aux_irq(ks, level);
}

static void i8042_mmio_reset(DeviceState *dev)
{
    MMIOKBDState *s = I8042_MMIO(dev);
    KBDState *ks = &s->kbd;

    kbd_reset(ks);
}

static void i8042_mmio_realize(DeviceState *dev, Error **errp)
{
    MMIOKBDState *s = I8042_MMIO(dev);
    KBDState *ks = &s->kbd;

    memory_region_init_io(&s->region, OBJECT(dev), &i8042_mmio_ops, ks,
                          "i8042", s->size);

    sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->region);

    if (!sysbus_realize(SYS_BUS_DEVICE(&ks->ps2kbd), errp)) {
        return;
    }

    if (!sysbus_realize(SYS_BUS_DEVICE(&ks->ps2mouse), errp)) {
        return;
    }

    qdev_connect_gpio_out(DEVICE(&ks->ps2kbd), PS2_DEVICE_IRQ,
                          qdev_get_gpio_in_named(dev, "ps2-kbd-input-irq",
                                                 0));

    qdev_connect_gpio_out(DEVICE(&ks->ps2mouse), PS2_DEVICE_IRQ,
                          qdev_get_gpio_in_named(dev, "ps2-mouse-input-irq",
                                                 0));
}

static void i8042_mmio_init(Object *obj)
{
    MMIOKBDState *s = I8042_MMIO(obj);
    KBDState *ks = &s->kbd;

    ks->extended_state = true;

    object_initialize_child(obj, "ps2kbd", &ks->ps2kbd, TYPE_PS2_KBD_DEVICE);
    object_initialize_child(obj, "ps2mouse", &ks->ps2mouse,
                            TYPE_PS2_MOUSE_DEVICE);

    qdev_init_gpio_out(DEVICE(obj), ks->irqs, 2);
    qdev_init_gpio_in_named(DEVICE(obj), i8042_mmio_set_kbd_irq,
                            "ps2-kbd-input-irq", 1);
    qdev_init_gpio_in_named(DEVICE(obj), i8042_mmio_set_mouse_irq,
                            "ps2-mouse-input-irq", 1);
}

static const Property i8042_mmio_properties[] = {
    DEFINE_PROP_UINT64("mask", MMIOKBDState, kbd.mask, UINT64_MAX),
    DEFINE_PROP_UINT32("size", MMIOKBDState, size, -1),
    DEFINE_PROP_END_OF_LIST(),
};

static const VMStateDescription vmstate_kbd_mmio = {
    .name = "pckbd-mmio",
    .version_id = 1,
    .minimum_version_id = 1,
    .fields = (const VMStateField[]) {
        VMSTATE_STRUCT(kbd, MMIOKBDState, 0, vmstate_kbd, KBDState),
        VMSTATE_END_OF_LIST()
    }
};

static void i8042_mmio_class_init(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);

    dc->realize = i8042_mmio_realize;
    device_class_set_legacy_reset(dc, i8042_mmio_reset);
    dc->vmsd = &vmstate_kbd_mmio;
    device_class_set_props(dc, i8042_mmio_properties);
    set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
}

static const TypeInfo i8042_mmio_info = {
    .name          = TYPE_I8042_MMIO,
    .parent        = TYPE_SYS_BUS_DEVICE,
    .instance_init = i8042_mmio_init,
    .instance_size = sizeof(MMIOKBDState),
    .class_init    = i8042_mmio_class_init
};

void i8042_isa_mouse_fake_event(ISAKBDState *isa)
{
    KBDState *s = &isa->kbd;

    ps2_mouse_fake_event(&s->ps2mouse);
}

static const VMStateDescription vmstate_kbd_isa = {
    .name = "pckbd",
    .version_id = 3,
    .minimum_version_id = 3,
    .fields = (const VMStateField[]) {
        VMSTATE_STRUCT(kbd, ISAKBDState, 0, vmstate_kbd, KBDState),
        VMSTATE_END_OF_LIST()
    }
};

static const MemoryRegionOps i8042_data_ops = {
    .read = kbd_read_data,
    .write = kbd_write_data,
    .impl = {
        .min_access_size = 1,
        .max_access_size = 1,
    },
    .endianness = DEVICE_LITTLE_ENDIAN,
};

static const MemoryRegionOps i8042_cmd_ops = {
    .read = kbd_read_status,
    .write = kbd_write_command,
    .impl = {
        .min_access_size = 1,
        .max_access_size = 1,
    },
    .endianness = DEVICE_LITTLE_ENDIAN,
};

static void i8042_set_kbd_irq(void *opaque, int n, int level)
{
    ISAKBDState *s = I8042(opaque);
    KBDState *ks = &s->kbd;

    kbd_update_kbd_irq(ks, level);
}

static void i8042_set_mouse_irq(void *opaque, int n, int level)
{
    ISAKBDState *s = I8042(opaque);
    KBDState *ks = &s->kbd;

    kbd_update_aux_irq(ks, level);
}


static void i8042_reset(DeviceState *dev)
{
    ISAKBDState *s = I8042(dev);
    KBDState *ks = &s->kbd;

    kbd_reset(ks);
}

static void i8042_initfn(Object *obj)
{
    ISAKBDState *isa_s = I8042(obj);
    KBDState *s = &isa_s->kbd;

    memory_region_init_io(isa_s->io + 0, obj, &i8042_data_ops, s,
                          "i8042-data", 1);
    memory_region_init_io(isa_s->io + 1, obj, &i8042_cmd_ops, s,
                          "i8042-cmd", 1);

    object_initialize_child(obj, "ps2kbd", &s->ps2kbd, TYPE_PS2_KBD_DEVICE);
    object_initialize_child(obj, "ps2mouse", &s->ps2mouse,
                            TYPE_PS2_MOUSE_DEVICE);

    qdev_init_gpio_out_named(DEVICE(obj), &s->a20_out, I8042_A20_LINE, 1);

    qdev_init_gpio_out(DEVICE(obj), s->irqs, 2);
    qdev_init_gpio_in_named(DEVICE(obj), i8042_set_kbd_irq,
                            "ps2-kbd-input-irq", 1);
    qdev_init_gpio_in_named(DEVICE(obj), i8042_set_mouse_irq,
                            "ps2-mouse-input-irq", 1);
}

static void i8042_realizefn(DeviceState *dev, Error **errp)
{
    ISADevice *isadev = ISA_DEVICE(dev);
    ISAKBDState *isa_s = I8042(dev);
    KBDState *s = &isa_s->kbd;

    if (isa_s->kbd_irq >= ISA_NUM_IRQS) {
        error_setg(errp, "Maximum value for \"kbd-irq\" is: %u",
                   ISA_NUM_IRQS - 1);
        return;
    }

    if (isa_s->mouse_irq >= ISA_NUM_IRQS) {
        error_setg(errp, "Maximum value for \"mouse-irq\" is: %u",
                   ISA_NUM_IRQS - 1);
        return;
    }

    isa_connect_gpio_out(isadev, I8042_KBD_IRQ, isa_s->kbd_irq);
    isa_connect_gpio_out(isadev, I8042_MOUSE_IRQ, isa_s->mouse_irq);

    isa_register_ioport(isadev, isa_s->io + 0, 0x60);
    isa_register_ioport(isadev, isa_s->io + 1, 0x64);

    if (!sysbus_realize(SYS_BUS_DEVICE(&s->ps2kbd), errp)) {
        return;
    }

    qdev_connect_gpio_out(DEVICE(&s->ps2kbd), PS2_DEVICE_IRQ,
                          qdev_get_gpio_in_named(dev, "ps2-kbd-input-irq",
                                                 0));

    if (!sysbus_realize(SYS_BUS_DEVICE(&s->ps2mouse), errp)) {
        return;
    }

    qdev_connect_gpio_out(DEVICE(&s->ps2mouse), PS2_DEVICE_IRQ,
                          qdev_get_gpio_in_named(dev, "ps2-mouse-input-irq",
                                                 0));

    if (isa_s->kbd_throttle && !isa_s->kbd.extended_state) {
        warn_report(TYPE_I8042 ": can't enable kbd-throttle without"
                    " extended-state, disabling kbd-throttle");
    } else if (isa_s->kbd_throttle) {
        s->throttle_timer = timer_new_us(QEMU_CLOCK_VIRTUAL,
                                         kbd_throttle_timeout, s);
    }
}

static void i8042_build_aml(AcpiDevAmlIf *adev, Aml *scope)
{
    ISAKBDState *isa_s = I8042(adev);
    Aml *kbd;
    Aml *mou;
    Aml *crs;

    crs = aml_resource_template();
    aml_append(crs, aml_io(AML_DECODE16, 0x0060, 0x0060, 0x01, 0x01));
    aml_append(crs, aml_io(AML_DECODE16, 0x0064, 0x0064, 0x01, 0x01));
    aml_append(crs, aml_irq_no_flags(isa_s->kbd_irq));

    kbd = aml_device("KBD");
    aml_append(kbd, aml_name_decl("_HID", aml_eisaid("PNP0303")));
    aml_append(kbd, aml_name_decl("_STA", aml_int(0xf)));
    aml_append(kbd, aml_name_decl("_CRS", crs));

    crs = aml_resource_template();
    aml_append(crs, aml_irq_no_flags(isa_s->mouse_irq));

    mou = aml_device("MOU");
    aml_append(mou, aml_name_decl("_HID", aml_eisaid("PNP0F13")));
    aml_append(mou, aml_name_decl("_STA", aml_int(0xf)));
    aml_append(mou, aml_name_decl("_CRS", crs));

    aml_append(scope, kbd);
    aml_append(scope, mou);
}

static const Property i8042_properties[] = {
    DEFINE_PROP_BOOL("extended-state", ISAKBDState, kbd.extended_state, true),
    DEFINE_PROP_BOOL("kbd-throttle", ISAKBDState, kbd_throttle, false),
    DEFINE_PROP_UINT8("kbd-irq", ISAKBDState, kbd_irq, 1),
    DEFINE_PROP_UINT8("mouse-irq", ISAKBDState, mouse_irq, 12),
    DEFINE_PROP_END_OF_LIST(),
};

static void i8042_class_initfn(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);
    AcpiDevAmlIfClass *adevc = ACPI_DEV_AML_IF_CLASS(klass);

    device_class_set_props(dc, i8042_properties);
    device_class_set_legacy_reset(dc, i8042_reset);
    dc->realize = i8042_realizefn;
    dc->vmsd = &vmstate_kbd_isa;
    adevc->build_dev_aml = i8042_build_aml;
    set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
}

static const TypeInfo i8042_info = {
    .name          = TYPE_I8042,
    .parent        = TYPE_ISA_DEVICE,
    .instance_size = sizeof(ISAKBDState),
    .instance_init = i8042_initfn,
    .class_init    = i8042_class_initfn,
    .interfaces = (InterfaceInfo[]) {
        { TYPE_ACPI_DEV_AML_IF },
        { },
    },
};

static void i8042_register_types(void)
{
    type_register_static(&i8042_info);
    type_register_static(&i8042_mmio_info);
}

type_init(i8042_register_types)