99 lines
2.3 KiB
C
99 lines
2.3 KiB
C
/*
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* QEMU Empty Slot
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*
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* The empty_slot device emulates known to a bus but not connected devices.
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*
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* Copyright (c) 2010 Artyom Tarasenko
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*
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* This code is licensed under the GNU GPL v2 or (at your option) any later
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* version.
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*/
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#include "hw/hw.h"
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#include "hw/sysbus.h"
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#include "hw/empty_slot.h"
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//#define DEBUG_EMPTY_SLOT
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#ifdef DEBUG_EMPTY_SLOT
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#define DPRINTF(fmt, ...) \
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do { printf("empty_slot: " fmt , ## __VA_ARGS__); } while (0)
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#else
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#define DPRINTF(fmt, ...) do {} while (0)
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#endif
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typedef struct EmptySlot {
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SysBusDevice busdev;
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MemoryRegion iomem;
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uint64_t size;
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} EmptySlot;
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static uint64_t empty_slot_read(void *opaque, hwaddr addr,
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unsigned size)
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{
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DPRINTF("read from " TARGET_FMT_plx "\n", addr);
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return 0;
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}
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static void empty_slot_write(void *opaque, hwaddr addr,
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uint64_t val, unsigned size)
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{
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DPRINTF("write 0x%x to " TARGET_FMT_plx "\n", (unsigned)val, addr);
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}
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static const MemoryRegionOps empty_slot_ops = {
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.read = empty_slot_read,
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.write = empty_slot_write,
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.endianness = DEVICE_NATIVE_ENDIAN,
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};
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void empty_slot_init(hwaddr addr, uint64_t slot_size)
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{
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if (slot_size > 0) {
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/* Only empty slots larger than 0 byte need handling. */
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DeviceState *dev;
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SysBusDevice *s;
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EmptySlot *e;
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dev = qdev_create(NULL, "empty_slot");
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s = SYS_BUS_DEVICE(dev);
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e = FROM_SYSBUS(EmptySlot, s);
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e->size = slot_size;
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qdev_init_nofail(dev);
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sysbus_mmio_map(s, 0, addr);
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}
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}
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static int empty_slot_init1(SysBusDevice *dev)
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{
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EmptySlot *s = FROM_SYSBUS(EmptySlot, dev);
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memory_region_init_io(&s->iomem, OBJECT(s), &empty_slot_ops, s,
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"empty-slot", s->size);
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sysbus_init_mmio(dev, &s->iomem);
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return 0;
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}
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static void empty_slot_class_init(ObjectClass *klass, void *data)
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{
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SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);
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k->init = empty_slot_init1;
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}
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static const TypeInfo empty_slot_info = {
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.name = "empty_slot",
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.parent = TYPE_SYS_BUS_DEVICE,
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.instance_size = sizeof(EmptySlot),
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.class_init = empty_slot_class_init,
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};
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static void empty_slot_register_types(void)
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{
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type_register_static(&empty_slot_info);
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}
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type_init(empty_slot_register_types)
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