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