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1 | /* "Unimplemented" device |
2 | * | |
3 | * This is a dummy device which accepts and logs all accesses. | |
4 | * It's useful for stubbing out regions of an SoC or board | |
5 | * map which correspond to devices that have not yet been | |
6 | * implemented. This is often sufficient to placate initial | |
7 | * guest device driver probing such that the system will | |
8 | * come up. | |
9 | * | |
10 | * Copyright Linaro Limited, 2017 | |
11 | * Written by Peter Maydell | |
12 | */ | |
13 | ||
14 | #include "qemu/osdep.h" | |
f5095aa3 PM |
15 | #include "hw/sysbus.h" |
16 | #include "hw/misc/unimp.h" | |
17 | #include "qemu/log.h" | |
0b8fa32f | 18 | #include "qemu/module.h" |
f5095aa3 PM |
19 | #include "qapi/error.h" |
20 | ||
f5095aa3 PM |
21 | static uint64_t unimp_read(void *opaque, hwaddr offset, unsigned size) |
22 | { | |
23 | UnimplementedDeviceState *s = UNIMPLEMENTED_DEVICE(opaque); | |
24 | ||
68274b94 | 25 | qemu_log_mask(LOG_UNIMP, "%s: unimplemented device read " |
55d35c88 PMD |
26 | "(size %d, offset 0x%0*" HWADDR_PRIx ")\n", |
27 | s->name, size, s->offset_fmt_width, offset); | |
f5095aa3 PM |
28 | return 0; |
29 | } | |
30 | ||
31 | static void unimp_write(void *opaque, hwaddr offset, | |
32 | uint64_t value, unsigned size) | |
33 | { | |
34 | UnimplementedDeviceState *s = UNIMPLEMENTED_DEVICE(opaque); | |
35 | ||
36 | qemu_log_mask(LOG_UNIMP, "%s: unimplemented device write " | |
55d35c88 | 37 | "(size %d, offset 0x%0*" HWADDR_PRIx |
a12b4c53 | 38 | ", value 0x%0*" PRIx64 ")\n", |
55d35c88 | 39 | s->name, size, s->offset_fmt_width, offset, size << 1, value); |
f5095aa3 PM |
40 | } |
41 | ||
42 | static const MemoryRegionOps unimp_ops = { | |
43 | .read = unimp_read, | |
44 | .write = unimp_write, | |
45 | .impl.min_access_size = 1, | |
46 | .impl.max_access_size = 8, | |
47 | .valid.min_access_size = 1, | |
48 | .valid.max_access_size = 8, | |
49 | .endianness = DEVICE_NATIVE_ENDIAN, | |
50 | }; | |
51 | ||
52 | static void unimp_realize(DeviceState *dev, Error **errp) | |
53 | { | |
54 | UnimplementedDeviceState *s = UNIMPLEMENTED_DEVICE(dev); | |
55 | ||
56 | if (s->size == 0) { | |
57 | error_setg(errp, "property 'size' not specified or zero"); | |
58 | return; | |
59 | } | |
60 | ||
61 | if (s->name == NULL) { | |
62 | error_setg(errp, "property 'name' not specified"); | |
63 | return; | |
64 | } | |
65 | ||
55d35c88 PMD |
66 | s->offset_fmt_width = DIV_ROUND_UP(64 - clz64(s->size - 1), 4); |
67 | ||
f5095aa3 PM |
68 | memory_region_init_io(&s->iomem, OBJECT(s), &unimp_ops, s, |
69 | s->name, s->size); | |
70 | sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem); | |
71 | } | |
72 | ||
73 | static Property unimp_properties[] = { | |
74 | DEFINE_PROP_UINT64("size", UnimplementedDeviceState, size, 0), | |
75 | DEFINE_PROP_STRING("name", UnimplementedDeviceState, name), | |
76 | DEFINE_PROP_END_OF_LIST(), | |
77 | }; | |
78 | ||
79 | static void unimp_class_init(ObjectClass *klass, void *data) | |
80 | { | |
81 | DeviceClass *dc = DEVICE_CLASS(klass); | |
82 | ||
83 | dc->realize = unimp_realize; | |
4f67d30b | 84 | device_class_set_props(dc, unimp_properties); |
f5095aa3 PM |
85 | } |
86 | ||
87 | static const TypeInfo unimp_info = { | |
88 | .name = TYPE_UNIMPLEMENTED_DEVICE, | |
89 | .parent = TYPE_SYS_BUS_DEVICE, | |
90 | .instance_size = sizeof(UnimplementedDeviceState), | |
91 | .class_init = unimp_class_init, | |
92 | }; | |
93 | ||
94 | static void unimp_register_types(void) | |
95 | { | |
96 | type_register_static(&unimp_info); | |
97 | } | |
98 | ||
99 | type_init(unimp_register_types) |