| 1 | /* |
| 2 | * QEMU Empty Slot |
| 3 | * |
| 4 | * The empty_slot device emulates known to a bus but not connected devices. |
| 5 | * |
| 6 | * Copyright (c) 2010 Artyom Tarasenko |
| 7 | * |
| 8 | * This code is licensed under the GNU GPL v2 or (at your option) any later |
| 9 | * version. |
| 10 | */ |
| 11 | |
| 12 | #include "qemu/osdep.h" |
| 13 | #include "hw/core/sysbus.h" |
| 14 | #include "hw/core/qdev-properties.h" |
| 15 | #include "hw/misc/empty_slot.h" |
| 16 | #include "qapi/error.h" |
| 17 | #include "trace.h" |
| 18 | #include "qom/object.h" |
| 19 | |
| 20 | #define TYPE_EMPTY_SLOT "empty_slot" |
| 21 | OBJECT_DECLARE_SIMPLE_TYPE(EmptySlot, EMPTY_SLOT) |
| 22 | |
| 23 | struct EmptySlot { |
| 24 | SysBusDevice parent_obj; |
| 25 | |
| 26 | MemoryRegion iomem; |
| 27 | char *name; |
| 28 | uint64_t size; |
| 29 | }; |
| 30 | |
| 31 | static uint64_t empty_slot_read(void *opaque, hwaddr addr, |
| 32 | unsigned size) |
| 33 | { |
| 34 | EmptySlot *s = EMPTY_SLOT(opaque); |
| 35 | |
| 36 | trace_empty_slot_write(addr, size << 1, 0, size, s->name); |
| 37 | |
| 38 | return 0; |
| 39 | } |
| 40 | |
| 41 | static void empty_slot_write(void *opaque, hwaddr addr, |
| 42 | uint64_t val, unsigned size) |
| 43 | { |
| 44 | EmptySlot *s = EMPTY_SLOT(opaque); |
| 45 | |
| 46 | trace_empty_slot_write(addr, size << 1, val, size, s->name); |
| 47 | } |
| 48 | |
| 49 | static const MemoryRegionOps empty_slot_ops = { |
| 50 | .read = empty_slot_read, |
| 51 | .write = empty_slot_write, |
| 52 | .endianness = DEVICE_NATIVE_ENDIAN, |
| 53 | }; |
| 54 | |
| 55 | void empty_slot_init(const char *name, hwaddr addr, uint64_t slot_size) |
| 56 | { |
| 57 | if (slot_size > 0) { |
| 58 | /* Only empty slots larger than 0 byte need handling. */ |
| 59 | DeviceState *dev; |
| 60 | |
| 61 | dev = qdev_new(TYPE_EMPTY_SLOT); |
| 62 | |
| 63 | qdev_prop_set_uint64(dev, "size", slot_size); |
| 64 | sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal); |
| 65 | |
| 66 | sysbus_mmio_map_overlap(SYS_BUS_DEVICE(dev), 0, addr, -10000); |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | static void empty_slot_realize(DeviceState *dev, Error **errp) |
| 71 | { |
| 72 | EmptySlot *s = EMPTY_SLOT(dev); |
| 73 | |
| 74 | if (s->name == NULL) { |
| 75 | s->name = g_strdup("empty-slot"); |
| 76 | } |
| 77 | memory_region_init_io(&s->iomem, OBJECT(s), &empty_slot_ops, s, |
| 78 | s->name, s->size); |
| 79 | sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->iomem); |
| 80 | } |
| 81 | |
| 82 | static const Property empty_slot_properties[] = { |
| 83 | DEFINE_PROP_UINT64("size", EmptySlot, size, 0), |
| 84 | DEFINE_PROP_STRING("name", EmptySlot, name), |
| 85 | }; |
| 86 | |
| 87 | static void empty_slot_class_init(ObjectClass *klass, const void *data) |
| 88 | { |
| 89 | DeviceClass *dc = DEVICE_CLASS(klass); |
| 90 | |
| 91 | dc->realize = empty_slot_realize; |
| 92 | device_class_set_props(dc, empty_slot_properties); |
| 93 | set_bit(DEVICE_CATEGORY_MISC, dc->categories); |
| 94 | } |
| 95 | |
| 96 | static const TypeInfo empty_slot_info = { |
| 97 | .name = TYPE_EMPTY_SLOT, |
| 98 | .parent = TYPE_SYS_BUS_DEVICE, |
| 99 | .instance_size = sizeof(EmptySlot), |
| 100 | .class_init = empty_slot_class_init, |
| 101 | }; |
| 102 | |
| 103 | static void empty_slot_register_types(void) |
| 104 | { |
| 105 | type_register_static(&empty_slot_info); |
| 106 | } |
| 107 | |
| 108 | type_init(empty_slot_register_types) |