LXR qemu/hw/misc/empty

   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/sysbus.h"
  14#include "hw/qdev-properties.h"
  15#include "hw/misc/empty_slot.h"
  16#include "qapi/error.h"
  17#include "trace.h"
  18
  19#define TYPE_EMPTY_SLOT "empty_slot"
  20#define EMPTY_SLOT(obj) OBJECT_CHECK(EmptySlot, (obj), TYPE_EMPTY_SLOT)
  21
  22typedef struct EmptySlot {
  23    SysBusDevice parent_obj;
  24
  25    MemoryRegion iomem;
  26    char *name;
  27    uint64_t size;
  28} EmptySlot;
  29
  30static uint64_t empty_slot_read(void *opaque, hwaddr addr,
  31                                unsigned size)
  32{
  33    EmptySlot *s = EMPTY_SLOT(opaque);
  34
  35    trace_empty_slot_write(addr, size << 1, 0, size, s->name);
  36
  37    return 0;
  38}
  39
  40static void empty_slot_write(void *opaque, hwaddr addr,
  41                             uint64_t val, unsigned size)
  42{
  43    EmptySlot *s = EMPTY_SLOT(opaque);
  44
  45    trace_empty_slot_write(addr, size << 1, val, size, s->name);
  46}
  47
  48static const MemoryRegionOps empty_slot_ops = {
  49    .read = empty_slot_read,
  50    .write = empty_slot_write,
  51    .endianness = DEVICE_NATIVE_ENDIAN,
  52};
  53
  54void empty_slot_init(const char *name, hwaddr addr, uint64_t slot_size)
  55{
  56    if (slot_size > 0) {
  57        /* Only empty slots larger than 0 byte need handling. */
  58        DeviceState *dev;
  59
  60        dev = qdev_new(TYPE_EMPTY_SLOT);
  61
  62        qdev_prop_set_uint64(dev, "size", slot_size);
  63        sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
  64
  65        sysbus_mmio_map_overlap(SYS_BUS_DEVICE(dev), 0, addr, -10000);
  66    }
  67}
  68
  69static void empty_slot_realize(DeviceState *dev, Error **errp)
  70{
  71    EmptySlot *s = EMPTY_SLOT(dev);
  72
  73    if (s->name == NULL) {
  74        s->name = g_strdup("empty-slot");
  75    }
  76    memory_region_init_io(&s->iomem, OBJECT(s), &empty_slot_ops, s,
  77                          s->name, s->size);
  78    sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->iomem);
  79}
  80
  81static Property empty_slot_properties[] = {
  82    DEFINE_PROP_UINT64("size", EmptySlot, size, 0),
  83    DEFINE_PROP_STRING("name", EmptySlot, name),
  84    DEFINE_PROP_END_OF_LIST(),
  85};
  86
  87static void empty_slot_class_init(ObjectClass *klass, 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
  96static 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
 103static void empty_slot_register_types(void)
 104{
 105    type_register_static(&empty_slot_info);
 106}
 107
 108type_init(empty_slot_register_types)
 109