aboutsummaryrefslogtreecommitdiff
path: root/hw/nvram/fw_cfg.c
blob: 999f4802803135a7f8c7aebcabb03a4a2e0abf80 (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
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
/*
 * QEMU Firmware configuration device emulation
 *
 * Copyright (c) 2008 Gleb Natapov
 *
 * 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 "hw/hw.h"
#include "sysemu/sysemu.h"
#include "sysemu/dma.h"
#include "hw/isa/isa.h"
#include "hw/nvram/fw_cfg.h"
#include "hw/sysbus.h"
#include "hw/boards.h"
#include "trace.h"
#include "qemu/error-report.h"
#include "qemu/config-file.h"
#include "qemu/cutils.h"

#define FW_CFG_NAME "fw_cfg"
#define FW_CFG_PATH "/machine/" FW_CFG_NAME

#define TYPE_FW_CFG     "fw_cfg"
#define TYPE_FW_CFG_IO  "fw_cfg_io"
#define TYPE_FW_CFG_MEM "fw_cfg_mem"

#define FW_CFG(obj)     OBJECT_CHECK(FWCfgState,    (obj), TYPE_FW_CFG)
#define FW_CFG_IO(obj)  OBJECT_CHECK(FWCfgIoState,  (obj), TYPE_FW_CFG_IO)
#define FW_CFG_MEM(obj) OBJECT_CHECK(FWCfgMemState, (obj), TYPE_FW_CFG_MEM)

/* FW_CFG_VERSION bits */
#define FW_CFG_VERSION      0x01
#define FW_CFG_VERSION_DMA  0x02

/* FW_CFG_DMA_CONTROL bits */
#define FW_CFG_DMA_CTL_ERROR   0x01
#define FW_CFG_DMA_CTL_READ    0x02
#define FW_CFG_DMA_CTL_SKIP    0x04
#define FW_CFG_DMA_CTL_SELECT  0x08

#define FW_CFG_DMA_SIGNATURE 0x51454d5520434647ULL /* "QEMU CFG" */

typedef struct FWCfgEntry {
    uint32_t len;
    uint8_t *data;
    void *callback_opaque;
    FWCfgReadCallback read_callback;
} FWCfgEntry;

struct FWCfgState {
    /*< private >*/
    SysBusDevice parent_obj;
    /*< public >*/

    FWCfgEntry entries[2][FW_CFG_MAX_ENTRY];
    int entry_order[FW_CFG_MAX_ENTRY];
    FWCfgFiles *files;
    uint16_t cur_entry;
    uint32_t cur_offset;
    Notifier machine_ready;

    int fw_cfg_order_override;

    bool dma_enabled;
    dma_addr_t dma_addr;
    AddressSpace *dma_as;
    MemoryRegion dma_iomem;
};

struct FWCfgIoState {
    /*< private >*/
    FWCfgState parent_obj;
    /*< public >*/

    MemoryRegion comb_iomem;
    uint32_t iobase, dma_iobase;
};

struct FWCfgMemState {
    /*< private >*/
    FWCfgState parent_obj;
    /*< public >*/

    MemoryRegion ctl_iomem, data_iomem;
    uint32_t data_width;
    MemoryRegionOps wide_data_ops;
};

#define JPG_FILE 0
#define BMP_FILE 1

static char *read_splashfile(char *filename, gsize *file_sizep,
                             int *file_typep)
{
    GError *err = NULL;
    gboolean res;
    gchar *content;
    int file_type;
    unsigned int filehead;
    int bmp_bpp;

    res = g_file_get_contents(filename, &content, file_sizep, &err);
    if (res == FALSE) {
        error_report("failed to read splash file '%s'", filename);
        g_error_free(err);
        return NULL;
    }

    /* check file size */
    if (*file_sizep < 30) {
        goto error;
    }

    /* check magic ID */
    filehead = ((content[0] & 0xff) + (content[1] << 8)) & 0xffff;
    if (filehead == 0xd8ff) {
        file_type = JPG_FILE;
    } else if (filehead == 0x4d42) {
        file_type = BMP_FILE;
    } else {
        goto error;
    }

    /* check BMP bpp */
    if (file_type == BMP_FILE) {
        bmp_bpp = (content[28] + (content[29] << 8)) & 0xffff;
        if (bmp_bpp != 24) {
            goto error;
        }
    }

    /* return values */
    *file_typep = file_type;

    return content;

error:
    error_report("splash file '%s' format not recognized; must be JPEG "
                 "or 24 bit BMP", filename);
    g_free(content);
    return NULL;
}

static void fw_cfg_bootsplash(FWCfgState *s)
{
    int boot_splash_time = -1;
    const char *boot_splash_filename = NULL;
    char *p;
    char *filename, *file_data;
    gsize file_size;
    int file_type;
    const char *temp;

    /* get user configuration */
    QemuOptsList *plist = qemu_find_opts("boot-opts");
    QemuOpts *opts = QTAILQ_FIRST(&plist->head);
    if (opts != NULL) {
        temp = qemu_opt_get(opts, "splash");
        if (temp != NULL) {
            boot_splash_filename = temp;
        }
        temp = qemu_opt_get(opts, "splash-time");
        if (temp != NULL) {
            p = (char *)temp;
            boot_splash_time = strtol(p, (char **)&p, 10);
        }
    }

    /* insert splash time if user configurated */
    if (boot_splash_time >= 0) {
        /* validate the input */
        if (boot_splash_time > 0xffff) {
            error_report("splash time is big than 65535, force it to 65535.");
            boot_splash_time = 0xffff;
        }
        /* use little endian format */
        qemu_extra_params_fw[0] = (uint8_t)(boot_splash_time & 0xff);
        qemu_extra_params_fw[1] = (uint8_t)((boot_splash_time >> 8) & 0xff);
        fw_cfg_add_file(s, "etc/boot-menu-wait", qemu_extra_params_fw, 2);
    }

    /* insert splash file if user configurated */
    if (boot_splash_filename != NULL) {
        filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, boot_splash_filename);
        if (filename == NULL) {
            error_report("failed to find file '%s'.", boot_splash_filename);
            return;
        }

        /* loading file data */
        file_data = read_splashfile(filename, &file_size, &file_type);
        if (file_data == NULL) {
            g_free(filename);
            return;
        }
        g_free(boot_splash_filedata);
        boot_splash_filedata = (uint8_t *)file_data;
        boot_splash_filedata_size = file_size;

        /* insert data */
        if (file_type == JPG_FILE) {
            fw_cfg_add_file(s, "bootsplash.jpg",
                    boot_splash_filedata, boot_splash_filedata_size);
        } else {
            fw_cfg_add_file(s, "bootsplash.bmp",
                    boot_splash_filedata, boot_splash_filedata_size);
        }
        g_free(filename);
    }
}

static void fw_cfg_reboot(FWCfgState *s)
{
    int reboot_timeout = -1;
    char *p;
    const char *temp;

    /* get user configuration */
    QemuOptsList *plist = qemu_find_opts("boot-opts");
    QemuOpts *opts = QTAILQ_FIRST(&plist->head);
    if (opts != NULL) {
        temp = qemu_opt_get(opts, "reboot-timeout");
        if (temp != NULL) {
            p = (char *)temp;
            reboot_timeout = strtol(p, (char **)&p, 10);
        }
    }
    /* validate the input */
    if (reboot_timeout > 0xffff) {
        error_report("reboot timeout is larger than 65535, force it to 65535.");
        reboot_timeout = 0xffff;
    }
    fw_cfg_add_file(s, "etc/boot-fail-wait", g_memdup(&reboot_timeout, 4), 4);
}

static void fw_cfg_write(FWCfgState *s, uint8_t value)
{
    /* nothing, write support removed in QEMU v2.4+ */
}

static int fw_cfg_select(FWCfgState *s, uint16_t key)
{
    int arch, ret;
    FWCfgEntry *e;

    s->cur_offset = 0;
    if ((key & FW_CFG_ENTRY_MASK) >= FW_CFG_MAX_ENTRY) {
        s->cur_entry = FW_CFG_INVALID;
        ret = 0;
    } else {
        s->cur_entry = key;
        ret = 1;
        /* entry successfully selected, now run callback if present */
        arch = !!(key & FW_CFG_ARCH_LOCAL);
        e = &s->entries[arch][key & FW_CFG_ENTRY_MASK];
        if (e->read_callback) {
            e->read_callback(e->callback_opaque);
        }
    }

    trace_fw_cfg_select(s, key, ret);
    return ret;
}

static uint64_t fw_cfg_data_read(void *opaque, hwaddr addr, unsigned size)
{
    FWCfgState *s = opaque;
    int arch = !!(s->cur_entry & FW_CFG_ARCH_LOCAL);
    FWCfgEntry *e = (s->cur_entry == FW_CFG_INVALID) ? NULL :
                    &s->entries[arch][s->cur_entry & FW_CFG_ENTRY_MASK];
    uint64_t value = 0;

    assert(size > 0 && size <= sizeof(value));
    if (s->cur_entry != FW_CFG_INVALID && e->data && s->cur_offset < e->len) {
        /* The least significant 'size' bytes of the return value are
         * expected to contain a string preserving portion of the item
         * data, padded with zeros on the right in case we run out early.
         * In technical terms, we're composing the host-endian representation
         * of the big endian interpretation of the fw_cfg string.
         */
        do {
            value = (value << 8) | e->data[s->cur_offset++];
        } while (--size && s->cur_offset < e->len);
        /* If size is still not zero, we *did* run out early, so continue
         * left-shifting, to add the appropriate number of padding zeros
         * on the right.
         */
        value <<= 8 * size;
    }

    trace_fw_cfg_read(s, value);
    return value;
}

static void fw_cfg_data_mem_write(void *opaque, hwaddr addr,
                                  uint64_t value, unsigned size)
{
    FWCfgState *s = opaque;
    unsigned i = size;

    do {
        fw_cfg_write(s, value >> (8 * --i));
    } while (i);
}

static void fw_cfg_dma_transfer(FWCfgState *s)
{
    dma_addr_t len;
    FWCfgDmaAccess dma;
    int arch;
    FWCfgEntry *e;
    int read;
    dma_addr_t dma_addr;

    /* Reset the address before the next access */
    dma_addr = s->dma_addr;
    s->dma_addr = 0;

    if (dma_memory_read(s->dma_as, dma_addr, &dma, sizeof(dma))) {
        stl_be_dma(s->dma_as, dma_addr + offsetof(FWCfgDmaAccess, control),
                   FW_CFG_DMA_CTL_ERROR);
        return;
    }

    dma.address = be64_to_cpu(dma.address);
    dma.length = be32_to_cpu(dma.length);
    dma.control = be32_to_cpu(dma.control);

    if (dma.control & FW_CFG_DMA_CTL_SELECT) {
        fw_cfg_select(s, dma.control >> 16);
    }

    arch = !!(s->cur_entry & FW_CFG_ARCH_LOCAL);
    e = (s->cur_entry == FW_CFG_INVALID) ? NULL :
        &s->entries[arch][s->cur_entry & FW_CFG_ENTRY_MASK];

    if (dma.control & FW_CFG_DMA_CTL_READ) {
        read = 1;
    } else if (dma.control & FW_CFG_DMA_CTL_SKIP) {
        read = 0;
    } else {
        dma.length = 0;
    }

    dma.control = 0;

    while (dma.length > 0 && !(dma.control & FW_CFG_DMA_CTL_ERROR)) {
        if (s->cur_entry == FW_CFG_INVALID || !e->data ||
                                s->cur_offset >= e->len) {
            len = dma.length;

            /* If the access is not a read access, it will be a skip access,
             * tested before.
             */
            if (read) {
                if (dma_memory_set(s->dma_as, dma.address, 0, len)) {
                    dma.control |= FW_CFG_DMA_CTL_ERROR;
                }
            }

        } else {
            if (dma.length <= (e->len - s->cur_offset)) {
                len = dma.length;
            } else {
                len = (e->len - s->cur_offset);
            }

            /* If the access is not a read access, it will be a skip access,
             * tested before.
             */
            if (read) {
                if (dma_memory_write(s->dma_as, dma.address,
                                    &e->data[s->cur_offset], len)) {
                    dma.control |= FW_CFG_DMA_CTL_ERROR;
                }
            }

            s->cur_offset += len;
        }

        dma.address += len;
        dma.length  -= len;

    }

    stl_be_dma(s->dma_as, dma_addr + offsetof(FWCfgDmaAccess, control),
                dma.control);

    trace_fw_cfg_read(s, 0);
}

static uint64_t fw_cfg_dma_mem_read(void *opaque, hwaddr addr,
                                    unsigned size)
{
    /* Return a signature value (and handle various read sizes) */
    return extract64(FW_CFG_DMA_SIGNATURE, (8 - addr - size) * 8, size * 8);
}

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

    if (size == 4) {
        if (addr == 0) {
            /* FWCfgDmaAccess high address */
            s->dma_addr = value << 32;
        } else if (addr == 4) {
            /* FWCfgDmaAccess low address */
            s->dma_addr |= value;
            fw_cfg_dma_transfer(s);
        }
    } else if (size == 8 && addr == 0) {
        s->dma_addr = value;
        fw_cfg_dma_transfer(s);
    }
}

static bool fw_cfg_dma_mem_valid(void *opaque, hwaddr addr,
                                  unsigned size, bool is_write)
{
    return !is_write || ((size == 4 && (addr == 0 || addr == 4)) ||
                         (size == 8 && addr == 0));
}

static bool fw_cfg_data_mem_valid(void *opaque, hwaddr addr,
                                  unsigned size, bool is_write)
{
    return addr == 0;
}

static void fw_cfg_ctl_mem_write(void *opaque, hwaddr addr,
                                 uint64_t value, unsigned size)
{
    fw_cfg_select(opaque, (uint16_t)value);
}

static bool fw_cfg_ctl_mem_valid(void *opaque, hwaddr addr,
                                 unsigned size, bool is_write)
{
    return is_write && size == 2;
}

static void fw_cfg_comb_write(void *opaque, hwaddr addr,
                              uint64_t value, unsigned size)
{
    switch (size) {
    case 1:
        fw_cfg_write(opaque, (uint8_t)value);
        break;
    case 2:
        fw_cfg_select(opaque, (uint16_t)value);
        break;
    }
}

static bool fw_cfg_comb_valid(void *opaque, hwaddr addr,
                                  unsigned size, bool is_write)
{
    return (size == 1) || (is_write && size == 2);
}

static const MemoryRegionOps fw_cfg_ctl_mem_ops = {
    .write = fw_cfg_ctl_mem_write,
    .endianness = DEVICE_BIG_ENDIAN,
    .valid.accepts = fw_cfg_ctl_mem_valid,
};

static const MemoryRegionOps fw_cfg_data_mem_ops = {
    .read = fw_cfg_data_read,
    .write = fw_cfg_data_mem_write,
    .endianness = DEVICE_BIG_ENDIAN,
    .valid = {
        .min_access_size = 1,
        .max_access_size = 1,
        .accepts = fw_cfg_data_mem_valid,
    },
};

static const MemoryRegionOps fw_cfg_comb_mem_ops = {
    .read = fw_cfg_data_read,
    .write = fw_cfg_comb_write,
    .endianness = DEVICE_LITTLE_ENDIAN,
    .valid.accepts = fw_cfg_comb_valid,
};

static const MemoryRegionOps fw_cfg_dma_mem_ops = {
    .read = fw_cfg_dma_mem_read,
    .write = fw_cfg_dma_mem_write,
    .endianness = DEVICE_BIG_ENDIAN,
    .valid.accepts = fw_cfg_dma_mem_valid,
    .valid.max_access_size = 8,
    .impl.max_access_size = 8,
};

static void fw_cfg_reset(DeviceState *d)
{
    FWCfgState *s = FW_CFG(d);

    /* we never register a read callback for FW_CFG_SIGNATURE */
    fw_cfg_select(s, FW_CFG_SIGNATURE);
}

/* Save restore 32 bit int as uint16_t
   This is a Big hack, but it is how the old state did it.
   Or we broke compatibility in the state, or we can't use struct tm
 */

static int get_uint32_as_uint16(QEMUFile *f, void *pv, size_t size)
{
    uint32_t *v = pv;
    *v = qemu_get_be16(f);
    return 0;
}

static void put_unused(QEMUFile *f, void *pv, size_t size)
{
    fprintf(stderr, "uint32_as_uint16 is only used for backward compatibility.\n");
    fprintf(stderr, "This functions shouldn't be called.\n");
}

static const VMStateInfo vmstate_hack_uint32_as_uint16 = {
    .name = "int32_as_uint16",
    .get  = get_uint32_as_uint16,
    .put  = put_unused,
};

#define VMSTATE_UINT16_HACK(_f, _s, _t)                                    \
    VMSTATE_SINGLE_TEST(_f, _s, _t, 0, vmstate_hack_uint32_as_uint16, uint32_t)


static bool is_version_1(void *opaque, int version_id)
{
    return version_id == 1;
}

static bool fw_cfg_dma_enabled(void *opaque)
{
    FWCfgState *s = opaque;

    return s->dma_enabled;
}

static const VMStateDescription vmstate_fw_cfg_dma = {
    .name = "fw_cfg/dma",
    .needed = fw_cfg_dma_enabled,
    .fields = (VMStateField[]) {
        VMSTATE_UINT64(dma_addr, FWCfgState),
        VMSTATE_END_OF_LIST()
    },
};

static const VMStateDescription vmstate_fw_cfg = {
    .name = "fw_cfg",
    .version_id = 2,
    .minimum_version_id = 1,
    .fields = (VMStateField[]) {
        VMSTATE_UINT16(cur_entry, FWCfgState),
        VMSTATE_UINT16_HACK(cur_offset, FWCfgState, is_version_1),
        VMSTATE_UINT32_V(cur_offset, FWCfgState, 2),
        VMSTATE_END_OF_LIST()
    },
    .subsections = (const VMStateDescription*[]) {
        &vmstate_fw_cfg_dma,
        NULL,
    }
};

static void fw_cfg_add_bytes_read_callback(FWCfgState *s, uint16_t key,
                                           FWCfgReadCallback callback,
                                           void *callback_opaque,
                                           void *data, size_t len)
{
    int arch = !!(key & FW_CFG_ARCH_LOCAL);

    key &= FW_CFG_ENTRY_MASK;

    assert(key < FW_CFG_MAX_ENTRY && len < UINT32_MAX);
    assert(s->entries[arch][key].data == NULL); /* avoid key conflict */

    s->entries[arch][key].data = data;
    s->entries[arch][key].len = (uint32_t)len;
    s->entries[arch][key].read_callback = callback;
    s->entries[arch][key].callback_opaque = callback_opaque;
}

static void *fw_cfg_modify_bytes_read(FWCfgState *s, uint16_t key,
                                              void *data, size_t len)
{
    void *ptr;
    int arch = !!(key & FW_CFG_ARCH_LOCAL);

    key &= FW_CFG_ENTRY_MASK;

    assert(key < FW_CFG_MAX_ENTRY && len < UINT32_MAX);

    /* return the old data to the function caller, avoid memory leak */
    ptr = s->entries[arch][key].data;
    s->entries[arch][key].data = data;
    s->entries[arch][key].len = len;
    s->entries[arch][key].callback_opaque = NULL;

    return ptr;
}

void fw_cfg_add_bytes(FWCfgState *s, uint16_t key, void *data, size_t len)
{
    fw_cfg_add_bytes_read_callback(s, key, NULL, NULL, data, len);
}

void fw_cfg_add_string(FWCfgState *s, uint16_t key, const char *value)
{
    size_t sz = strlen(value) + 1;

    fw_cfg_add_bytes(s, key, g_memdup(value, sz), sz);
}

void fw_cfg_add_i16(FWCfgState *s, uint16_t key, uint16_t value)
{
    uint16_t *copy;

    copy = g_malloc(sizeof(value));
    *copy = cpu_to_le16(value);
    fw_cfg_add_bytes(s, key, copy, sizeof(value));
}

void fw_cfg_modify_i16(FWCfgState *s, uint16_t key, uint16_t value)
{
    uint16_t *copy, *old;

    copy = g_malloc(sizeof(value));
    *copy = cpu_to_le16(value);
    old = fw_cfg_modify_bytes_read(s, key, copy, sizeof(value));
    g_free(old);
}

void fw_cfg_add_i32(FWCfgState *s, uint16_t key, uint32_t value)
{
    uint32_t *copy;

    copy = g_malloc(sizeof(value));
    *copy = cpu_to_le32(value);
    fw_cfg_add_bytes(s, key, copy, sizeof(value));
}

void fw_cfg_add_i64(FWCfgState *s, uint16_t key, uint64_t value)
{
    uint64_t *copy;

    copy = g_malloc(sizeof(value));
    *copy = cpu_to_le64(value);
    fw_cfg_add_bytes(s, key, copy, sizeof(value));
}

void fw_cfg_set_order_override(FWCfgState *s, int order)
{
    assert(s->fw_cfg_order_override == 0);
    s->fw_cfg_order_override = order;
}

void fw_cfg_reset_order_override(FWCfgState *s)
{
    assert(s->fw_cfg_order_override != 0);
    s->fw_cfg_order_override = 0;
}

/*
 * This is the legacy order list.  For legacy systems, files are in
 * the fw_cfg in the order defined below, by the "order" value.  Note
 * that some entries (VGA ROMs, NIC option ROMS, etc.) go into a
 * specific area, but there may be more than one and they occur in the
 * order that the user specifies them on the command line.  Those are
 * handled in a special manner, using the order override above.
 *
 * For non-legacy, the files are sorted by filename to avoid this kind
 * of complexity in the future.
 *
 * This is only for x86, other arches don't implement versioning so
 * they won't set legacy mode.
 */
static struct {
    const char *name;
    int order;
} fw_cfg_order[] = {
    { "etc/boot-menu-wait", 10 },
    { "bootsplash.jpg", 11 },
    { "bootsplash.bmp", 12 },
    { "etc/boot-fail-wait", 15 },
    { "etc/smbios/smbios-tables", 20 },
    { "etc/smbios/smbios-anchor", 30 },
    { "etc/e820", 40 },
    { "etc/reserved-memory-end", 50 },
    { "genroms/kvmvapic.bin", 55 },
    { "genroms/linuxboot.bin", 60 },
    { }, /* VGA ROMs from pc_vga_init come here, 70. */
    { }, /* NIC option ROMs from pc_nic_init come here, 80. */
    { "etc/system-states", 90 },
    { }, /* User ROMs come here, 100. */
    { }, /* Device FW comes here, 110. */
    { "etc/extra-pci-roots", 120 },
    { "etc/acpi/tables", 130 },
    { "etc/table-loader", 140 },
    { "etc/tpm/log", 150 },
    { "etc/acpi/rsdp", 160 },
    { "bootorder", 170 },

#define FW_CFG_ORDER_OVERRIDE_LAST 200
};

static int get_fw_cfg_order(FWCfgState *s, const char *name)
{
    int i;

    if (s->fw_cfg_order_override > 0)
	return s->fw_cfg_order_override;

    for (i = 0; i < ARRAY_SIZE(fw_cfg_order); i++) {
	if (fw_cfg_order[i].name == NULL)
	    continue;
	if (strcmp(name, fw_cfg_order[i].name) == 0)
	    return fw_cfg_order[i].order;
    }
    /* Stick unknown stuff at the end. */
    error_report("warning: Unknown firmware file in legacy mode: %s\n", name);
    return FW_CFG_ORDER_OVERRIDE_LAST;
}

void fw_cfg_add_file_callback(FWCfgState *s,  const char *filename,
                              FWCfgReadCallback callback, void *callback_opaque,
                              void *data, size_t len)
{
    int i, index, count;
    size_t dsize;
    MachineClass *mc = MACHINE_GET_CLASS(qdev_get_machine());
    int order = 0;

    if (!s->files) {
        dsize = sizeof(uint32_t) + sizeof(FWCfgFile) * FW_CFG_FILE_SLOTS;
        s->files = g_malloc0(dsize);
        fw_cfg_add_bytes(s, FW_CFG_FILE_DIR, s->files, dsize);
    }

    count = be32_to_cpu(s->files->count);
    assert(count < FW_CFG_FILE_SLOTS);

    /* Find the insertion point. */
    if (mc->legacy_fw_cfg_order) {
        /*
         * Sort by order. For files with the same order, we keep them
         * in the sequence in which they were added.
         */
        order = get_fw_cfg_order(s, filename);
        for (index = count;
             index > 0 && order < s->entry_order[index - 1];
             index--);
    } else {
        /* Sort by file name. */
        for (index = count;
             index > 0 && strcmp(filename, s->files->f[index - 1].name) < 0;
             index--);
    }

    /*
     * Move all the entries from the index point and after down one
     * to create a slot for the new entry.  Because calculations are
     * being done with the index, make it so that "i" is the current
     * index and "i - 1" is the one being copied from, thus the
     * unusual start and end in the for statement.
     */
    for (i = count + 1; i > index; i--) {
        s->files->f[i] = s->files->f[i - 1];
        s->files->f[i].select = cpu_to_be16(FW_CFG_FILE_FIRST + i);
        s->entries[0][FW_CFG_FILE_FIRST + i] =
            s->entries[0][FW_CFG_FILE_FIRST + i - 1];
        s->entry_order[i] = s->entry_order[i - 1];
    }

    memset(&s->files->f[index], 0, sizeof(FWCfgFile));
    memset(&s->entries[0][FW_CFG_FILE_FIRST + index], 0, sizeof(FWCfgEntry));

    pstrcpy(s->files->f[index].name, sizeof(s->files->f[index].name), filename);
    for (i = 0; i <= count; i++) {
        if (i != index &&
            strcmp(s->files->f[index].name, s->files->f[i].name) == 0) {
            error_report("duplicate fw_cfg file name: %s",
                         s->files->f[index].name);
            exit(1);
        }
    }

    fw_cfg_add_bytes_read_callback(s, FW_CFG_FILE_FIRST + index,
                                   callback, callback_opaque, data, len);

    s->files->f[index].size   = cpu_to_be32(len);
    s->files->f[index].select = cpu_to_be16(FW_CFG_FILE_FIRST + index);
    s->entry_order[index] = order;
    trace_fw_cfg_add_file(s, index, s->files->f[index].name, len);

    s->files->count = cpu_to_be32(count+1);
}

void fw_cfg_add_file(FWCfgState *s,  const char *filename,
                     void *data, size_t len)
{
    fw_cfg_add_file_callback(s, filename, NULL, NULL, data, len);
}

void *fw_cfg_modify_file(FWCfgState *s, const char *filename,
                        void *data, size_t len)
{
    int i, index;
    void *ptr = NULL;

    assert(s->files);

    index = be32_to_cpu(s->files->count);
    assert(index < FW_CFG_FILE_SLOTS);

    for (i = 0; i < index; i++) {
        if (strcmp(filename, s->files->f[i].name) == 0) {
            ptr = fw_cfg_modify_bytes_read(s, FW_CFG_FILE_FIRST + i,
                                           data, len);
            s->files->f[i].size   = cpu_to_be32(len);
            return ptr;
        }
    }
    /* add new one */
    fw_cfg_add_file_callback(s, filename, NULL, NULL, data, len);
    return NULL;
}

static void fw_cfg_machine_reset(void *opaque)
{
    void *ptr;
    size_t len;
    FWCfgState *s = opaque;
    char *bootindex = get_boot_devices_list(&len, false);

    ptr = fw_cfg_modify_file(s, "bootorder", (uint8_t *)bootindex, len);
    g_free(ptr);
}

static void fw_cfg_machine_ready(struct Notifier *n, void *data)
{
    FWCfgState *s = container_of(n, FWCfgState, machine_ready);
    qemu_register_reset(fw_cfg_machine_reset, s);
}



static void fw_cfg_init1(DeviceState *dev)
{
    FWCfgState *s = FW_CFG(dev);

    assert(!object_resolve_path(FW_CFG_PATH, NULL));

    object_property_add_child(qdev_get_machine(), FW_CFG_NAME, OBJECT(s), NULL);

    qdev_init_nofail(dev);

    fw_cfg_add_bytes(s, FW_CFG_SIGNATURE, (char *)"QEMU", 4);
    fw_cfg_add_bytes(s, FW_CFG_UUID, qemu_uuid, 16);
    fw_cfg_add_i16(s, FW_CFG_NOGRAPHIC, (uint16_t)(display_type == DT_NOGRAPHIC));
    fw_cfg_add_i16(s, FW_CFG_NB_CPUS, (uint16_t)smp_cpus);
    fw_cfg_add_i16(s, FW_CFG_BOOT_MENU, (uint16_t)boot_menu);
    fw_cfg_bootsplash(s);
    fw_cfg_reboot(s);

    s->machine_ready.notify = fw_cfg_machine_ready;
    qemu_add_machine_init_done_notifier(&s->machine_ready);
}

FWCfgState *fw_cfg_init_io_dma(uint32_t iobase, uint32_t dma_iobase,
                                AddressSpace *dma_as)
{
    DeviceState *dev;
    FWCfgState *s;
    uint32_t version = FW_CFG_VERSION;
    bool dma_requested = dma_iobase && dma_as;

    dev = qdev_create(NULL, TYPE_FW_CFG_IO);
    qdev_prop_set_uint32(dev, "iobase", iobase);
    qdev_prop_set_uint32(dev, "dma_iobase", dma_iobase);
    if (!dma_requested) {
        qdev_prop_set_bit(dev, "dma_enabled", false);
    }

    fw_cfg_init1(dev);
    s = FW_CFG(dev);

    if (s->dma_enabled) {
        /* 64 bits for the address field */
        s->dma_as = dma_as;
        s->dma_addr = 0;

        version |= FW_CFG_VERSION_DMA;
    }

    fw_cfg_add_i32(s, FW_CFG_ID, version);

    return s;
}

FWCfgState *fw_cfg_init_io(uint32_t iobase)
{
    return fw_cfg_init_io_dma(iobase, 0, NULL);
}

FWCfgState *fw_cfg_init_mem_wide(hwaddr ctl_addr,
                                 hwaddr data_addr, uint32_t data_width,
                                 hwaddr dma_addr, AddressSpace *dma_as)
{
    DeviceState *dev;
    SysBusDevice *sbd;
    FWCfgState *s;
    uint32_t version = FW_CFG_VERSION;
    bool dma_requested = dma_addr && dma_as;

    dev = qdev_create(NULL, TYPE_FW_CFG_MEM);
    qdev_prop_set_uint32(dev, "data_width", data_width);
    if (!dma_requested) {
        qdev_prop_set_bit(dev, "dma_enabled", false);
    }

    fw_cfg_init1(dev);

    sbd = SYS_BUS_DEVICE(dev);
    sysbus_mmio_map(sbd, 0, ctl_addr);
    sysbus_mmio_map(sbd, 1, data_addr);

    s = FW_CFG(dev);

    if (s->dma_enabled) {
        s->dma_as = dma_as;
        s->dma_addr = 0;
        sysbus_mmio_map(sbd, 2, dma_addr);
        version |= FW_CFG_VERSION_DMA;
    }

    fw_cfg_add_i32(s, FW_CFG_ID, version);

    return s;
}

FWCfgState *fw_cfg_init_mem(hwaddr ctl_addr, hwaddr data_addr)
{
    return fw_cfg_init_mem_wide(ctl_addr, data_addr,
                                fw_cfg_data_mem_ops.valid.max_access_size,
                                0, NULL);
}


FWCfgState *fw_cfg_find(void)
{
    return FW_CFG(object_resolve_path(FW_CFG_PATH, NULL));
}

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

    dc->reset = fw_cfg_reset;
    dc->vmsd = &vmstate_fw_cfg;
}

static const TypeInfo fw_cfg_info = {
    .name          = TYPE_FW_CFG,
    .parent        = TYPE_SYS_BUS_DEVICE,
    .instance_size = sizeof(FWCfgState),
    .class_init    = fw_cfg_class_init,
};


static Property fw_cfg_io_properties[] = {
    DEFINE_PROP_UINT32("iobase", FWCfgIoState, iobase, -1),
    DEFINE_PROP_UINT32("dma_iobase", FWCfgIoState, dma_iobase, -1),
    DEFINE_PROP_BOOL("dma_enabled", FWCfgIoState, parent_obj.dma_enabled,
                     true),
    DEFINE_PROP_END_OF_LIST(),
};

static void fw_cfg_io_realize(DeviceState *dev, Error **errp)
{
    FWCfgIoState *s = FW_CFG_IO(dev);
    SysBusDevice *sbd = SYS_BUS_DEVICE(dev);

    /* when using port i/o, the 8-bit data register ALWAYS overlaps
     * with half of the 16-bit control register. Hence, the total size
     * of the i/o region used is FW_CFG_CTL_SIZE */
    memory_region_init_io(&s->comb_iomem, OBJECT(s), &fw_cfg_comb_mem_ops,
                          FW_CFG(s), "fwcfg", FW_CFG_CTL_SIZE);
    sysbus_add_io(sbd, s->iobase, &s->comb_iomem);

    if (FW_CFG(s)->dma_enabled) {
        memory_region_init_io(&FW_CFG(s)->dma_iomem, OBJECT(s),
                              &fw_cfg_dma_mem_ops, FW_CFG(s), "fwcfg.dma",
                              sizeof(dma_addr_t));
        sysbus_add_io(sbd, s->dma_iobase, &FW_CFG(s)->dma_iomem);
    }
}

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

    dc->realize = fw_cfg_io_realize;
    dc->props = fw_cfg_io_properties;
}

static const TypeInfo fw_cfg_io_info = {
    .name          = TYPE_FW_CFG_IO,
    .parent        = TYPE_FW_CFG,
    .instance_size = sizeof(FWCfgIoState),
    .class_init    = fw_cfg_io_class_init,
};


static Property fw_cfg_mem_properties[] = {
    DEFINE_PROP_UINT32("data_width", FWCfgMemState, data_width, -1),
    DEFINE_PROP_BOOL("dma_enabled", FWCfgMemState, parent_obj.dma_enabled,
                     true),
    DEFINE_PROP_END_OF_LIST(),
};

static void fw_cfg_mem_realize(DeviceState *dev, Error **errp)
{
    FWCfgMemState *s = FW_CFG_MEM(dev);
    SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
    const MemoryRegionOps *data_ops = &fw_cfg_data_mem_ops;

    memory_region_init_io(&s->ctl_iomem, OBJECT(s), &fw_cfg_ctl_mem_ops,
                          FW_CFG(s), "fwcfg.ctl", FW_CFG_CTL_SIZE);
    sysbus_init_mmio(sbd, &s->ctl_iomem);

    if (s->data_width > data_ops->valid.max_access_size) {
        /* memberwise copy because the "old_mmio" member is const */
        s->wide_data_ops.read       = data_ops->read;
        s->wide_data_ops.write      = data_ops->write;
        s->wide_data_ops.endianness = data_ops->endianness;
        s->wide_data_ops.valid      = data_ops->valid;
        s->wide_data_ops.impl       = data_ops->impl;

        s->wide_data_ops.valid.max_access_size = s->data_width;
        s->wide_data_ops.impl.max_access_size  = s->data_width;
        data_ops = &s->wide_data_ops;
    }
    memory_region_init_io(&s->data_iomem, OBJECT(s), data_ops, FW_CFG(s),
                          "fwcfg.data", data_ops->valid.max_access_size);
    sysbus_init_mmio(sbd, &s->data_iomem);

    if (FW_CFG(s)->dma_enabled) {
        memory_region_init_io(&FW_CFG(s)->dma_iomem, OBJECT(s),
                              &fw_cfg_dma_mem_ops, FW_CFG(s), "fwcfg.dma",
                              sizeof(dma_addr_t));
        sysbus_init_mmio(sbd, &FW_CFG(s)->dma_iomem);
    }
}

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

    dc->realize = fw_cfg_mem_realize;
    dc->props = fw_cfg_mem_properties;
}

static const TypeInfo fw_cfg_mem_info = {
    .name          = TYPE_FW_CFG_MEM,
    .parent        = TYPE_FW_CFG,
    .instance_size = sizeof(FWCfgMemState),
    .class_init    = fw_cfg_mem_class_init,
};


static void fw_cfg_register_types(void)
{
    type_register_static(&fw_cfg_info);
    type_register_static(&fw_cfg_io_info);
    type_register_static(&fw_cfg_mem_info);
}

type_init(fw_cfg_register_types)