root / hw / empty_slot.c @ 03f48b07
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1 | da9fcfa5 | Artyom Tarasenko | /*
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2 | da9fcfa5 | Artyom Tarasenko | * QEMU Empty Slot
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3 | da9fcfa5 | Artyom Tarasenko | *
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4 | da9fcfa5 | Artyom Tarasenko | * The empty_slot device emulates known to a bus but not connected devices.
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5 | da9fcfa5 | Artyom Tarasenko | *
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6 | da9fcfa5 | Artyom Tarasenko | * Copyright (c) 2010 Artyom Tarasenko
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7 | da9fcfa5 | Artyom Tarasenko | *
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8 | da9fcfa5 | Artyom Tarasenko | * This code is licensed under the GNU GPL v2 or (at your option) any later
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9 | da9fcfa5 | Artyom Tarasenko | * version.
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10 | da9fcfa5 | Artyom Tarasenko | */
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11 | da9fcfa5 | Artyom Tarasenko | |
12 | da9fcfa5 | Artyom Tarasenko | #include "hw.h" |
13 | da9fcfa5 | Artyom Tarasenko | #include "sysbus.h" |
14 | da9fcfa5 | Artyom Tarasenko | #include "empty_slot.h" |
15 | da9fcfa5 | Artyom Tarasenko | |
16 | da9fcfa5 | Artyom Tarasenko | //#define DEBUG_EMPTY_SLOT
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17 | da9fcfa5 | Artyom Tarasenko | |
18 | da9fcfa5 | Artyom Tarasenko | #ifdef DEBUG_EMPTY_SLOT
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19 | da9fcfa5 | Artyom Tarasenko | #define DPRINTF(fmt, ...) \
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20 | da9fcfa5 | Artyom Tarasenko | do { printf("empty_slot: " fmt , ## __VA_ARGS__); } while (0) |
21 | da9fcfa5 | Artyom Tarasenko | #else
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22 | da9fcfa5 | Artyom Tarasenko | #define DPRINTF(fmt, ...) do {} while (0) |
23 | da9fcfa5 | Artyom Tarasenko | #endif
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24 | da9fcfa5 | Artyom Tarasenko | |
25 | da9fcfa5 | Artyom Tarasenko | typedef struct EmptySlot { |
26 | da9fcfa5 | Artyom Tarasenko | SysBusDevice busdev; |
27 | b0a941b0 | Avi Kivity | MemoryRegion iomem; |
28 | da9fcfa5 | Artyom Tarasenko | uint64_t size; |
29 | da9fcfa5 | Artyom Tarasenko | } EmptySlot; |
30 | da9fcfa5 | Artyom Tarasenko | |
31 | b0a941b0 | Avi Kivity | static uint64_t empty_slot_read(void *opaque, target_phys_addr_t addr, |
32 | b0a941b0 | Avi Kivity | unsigned size)
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33 | da9fcfa5 | Artyom Tarasenko | { |
34 | da9fcfa5 | Artyom Tarasenko | DPRINTF("read from " TARGET_FMT_plx "\n", addr); |
35 | da9fcfa5 | Artyom Tarasenko | return 0; |
36 | da9fcfa5 | Artyom Tarasenko | } |
37 | da9fcfa5 | Artyom Tarasenko | |
38 | b0a941b0 | Avi Kivity | static void empty_slot_write(void *opaque, target_phys_addr_t addr, |
39 | b0a941b0 | Avi Kivity | uint64_t val, unsigned size)
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40 | da9fcfa5 | Artyom Tarasenko | { |
41 | b0a941b0 | Avi Kivity | DPRINTF("write 0x%x to " TARGET_FMT_plx "\n", (unsigned)val, addr); |
42 | da9fcfa5 | Artyom Tarasenko | } |
43 | da9fcfa5 | Artyom Tarasenko | |
44 | b0a941b0 | Avi Kivity | static const MemoryRegionOps empty_slot_ops = { |
45 | b0a941b0 | Avi Kivity | .read = empty_slot_read, |
46 | b0a941b0 | Avi Kivity | .write = empty_slot_write, |
47 | b0a941b0 | Avi Kivity | .endianness = DEVICE_NATIVE_ENDIAN, |
48 | da9fcfa5 | Artyom Tarasenko | }; |
49 | da9fcfa5 | Artyom Tarasenko | |
50 | da9fcfa5 | Artyom Tarasenko | void empty_slot_init(target_phys_addr_t addr, uint64_t slot_size)
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51 | da9fcfa5 | Artyom Tarasenko | { |
52 | 1a00282a | Stefan Weil | if (slot_size > 0) { |
53 | 1a00282a | Stefan Weil | /* Only empty slots larger than 0 byte need handling. */
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54 | 1a00282a | Stefan Weil | DeviceState *dev; |
55 | 1a00282a | Stefan Weil | SysBusDevice *s; |
56 | 1a00282a | Stefan Weil | EmptySlot *e; |
57 | da9fcfa5 | Artyom Tarasenko | |
58 | 1a00282a | Stefan Weil | dev = qdev_create(NULL, "empty_slot"); |
59 | 1a00282a | Stefan Weil | s = sysbus_from_qdev(dev); |
60 | 1a00282a | Stefan Weil | e = FROM_SYSBUS(EmptySlot, s); |
61 | 1a00282a | Stefan Weil | e->size = slot_size; |
62 | da9fcfa5 | Artyom Tarasenko | |
63 | 1a00282a | Stefan Weil | qdev_init_nofail(dev); |
64 | da9fcfa5 | Artyom Tarasenko | |
65 | 1a00282a | Stefan Weil | sysbus_mmio_map(s, 0, addr);
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66 | 1a00282a | Stefan Weil | } |
67 | da9fcfa5 | Artyom Tarasenko | } |
68 | da9fcfa5 | Artyom Tarasenko | |
69 | da9fcfa5 | Artyom Tarasenko | static int empty_slot_init1(SysBusDevice *dev) |
70 | da9fcfa5 | Artyom Tarasenko | { |
71 | da9fcfa5 | Artyom Tarasenko | EmptySlot *s = FROM_SYSBUS(EmptySlot, dev); |
72 | da9fcfa5 | Artyom Tarasenko | |
73 | b0a941b0 | Avi Kivity | memory_region_init_io(&s->iomem, &empty_slot_ops, s, |
74 | b0a941b0 | Avi Kivity | "empty-slot", s->size);
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75 | 750ecd44 | Avi Kivity | sysbus_init_mmio(dev, &s->iomem); |
76 | da9fcfa5 | Artyom Tarasenko | return 0; |
77 | da9fcfa5 | Artyom Tarasenko | } |
78 | da9fcfa5 | Artyom Tarasenko | |
79 | 999e12bb | Anthony Liguori | static void empty_slot_class_init(ObjectClass *klass, void *data) |
80 | 999e12bb | Anthony Liguori | { |
81 | 999e12bb | Anthony Liguori | SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass); |
82 | 999e12bb | Anthony Liguori | |
83 | 999e12bb | Anthony Liguori | k->init = empty_slot_init1; |
84 | 999e12bb | Anthony Liguori | } |
85 | 999e12bb | Anthony Liguori | |
86 | 39bffca2 | Anthony Liguori | static TypeInfo empty_slot_info = {
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87 | 39bffca2 | Anthony Liguori | .name = "empty_slot",
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88 | 39bffca2 | Anthony Liguori | .parent = TYPE_SYS_BUS_DEVICE, |
89 | 39bffca2 | Anthony Liguori | .instance_size = sizeof(EmptySlot),
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90 | 39bffca2 | Anthony Liguori | .class_init = empty_slot_class_init, |
91 | da9fcfa5 | Artyom Tarasenko | }; |
92 | da9fcfa5 | Artyom Tarasenko | |
93 | 83f7d43a | Andreas Färber | static void empty_slot_register_types(void) |
94 | da9fcfa5 | Artyom Tarasenko | { |
95 | 39bffca2 | Anthony Liguori | type_register_static(&empty_slot_info); |
96 | da9fcfa5 | Artyom Tarasenko | } |
97 | da9fcfa5 | Artyom Tarasenko | |
98 | 83f7d43a | Andreas Färber | type_init(empty_slot_register_types) |