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#include "qom/object.h"
  19
  20#define TYPE_EMPTY_SLOT "empty_slot"
  21OBJECT_DECLARE_SIMPLE_TYPE(EmptySlot, EMPTY_SLOT)
  22
  23struct EmptySlot {
  24    SysBusDevice parent_obj;
  25
  26    MemoryRegion iomem;
  27    char *name;
  28    uint64_t size;
  29};
  30
  31static 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
  41static 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
  49static const MemoryRegionOps empty_slot_ops = {
  50    .read = empty_slot_read,
  51    .write = empty_slot_write,
  52    .endianness = DEVICE_NATIVE_ENDIAN,
  53};
  54
  55void 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
  70static 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
  82static Property empty_slot_properties[] = {
  83    DEFINE_PROP_UINT64("size", EmptySlot, size, 0),
  84    DEFINE_PROP_STRING("name", EmptySlot, name),
  85    DEFINE_PROP_END_OF_LIST(),
  86};
  87
  88static void empty_slot_class_init(ObjectClass *klass, void *data)
  89{
  90    DeviceClass *dc = DEVICE_CLASS(klass);
  91
  92    dc->realize = empty_slot_realize;
  93    device_class_set_props(dc, empty_slot_properties);
  94    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
  95}
  96
  97static const TypeInfo empty_slot_info = {
  98    .name          = TYPE_EMPTY_SLOT,
  99    .parent        = TYPE_SYS_BUS_DEVICE,
 100    .instance_size = sizeof(EmptySlot),
 101    .class_init    = empty_slot_class_init,
 102};
 103
 104static void empty_slot_register_types(void)
 105{
 106    type_register_static(&empty_slot_info);
 107}
 108
 109type_init(empty_slot_register_types)
 110