xref: /openbmc/qemu/include/hw/misc/unimp.h (revision c122bca9)
1 /*
2  * "Unimplemented" device
3  *
4  * Copyright Linaro Limited, 2017
5  * Written by Peter Maydell
6  */
7 
8 #ifndef HW_MISC_UNIMP_H
9 #define HW_MISC_UNIMP_H
10 
11 #include "hw/qdev-properties.h"
12 #include "hw/sysbus.h"
13 #include "qapi/error.h"
14 #include "qom/object.h"
15 
16 #define TYPE_UNIMPLEMENTED_DEVICE "unimplemented-device"
17 
18 OBJECT_DECLARE_SIMPLE_TYPE(UnimplementedDeviceState, UNIMPLEMENTED_DEVICE)
19 
20 struct UnimplementedDeviceState {
21     SysBusDevice parent_obj;
22     MemoryRegion iomem;
23     unsigned offset_fmt_width;
24     char *name;
25     uint64_t size;
26 };
27 
28 /**
29  * create_unimplemented_device: create and map a dummy device
30  * @name: name of the device for debug logging
31  * @base: base address of the device's MMIO region
32  * @size: size of the device's MMIO region
33  *
34  * This utility function creates and maps an instance of unimplemented-device,
35  * which is a dummy device which simply logs all guest accesses to
36  * it via the qemu_log LOG_UNIMP debug log.
37  * The device is mapped at priority -1000, which means that you can
38  * use it to cover a large region and then map other devices on top of it
39  * if necessary.
40  */
create_unimplemented_device(const char * name,hwaddr base,hwaddr size)41 static inline void create_unimplemented_device(const char *name,
42                                                hwaddr base,
43                                                hwaddr size)
44 {
45     DeviceState *dev = qdev_new(TYPE_UNIMPLEMENTED_DEVICE);
46 
47     qdev_prop_set_string(dev, "name", name);
48     qdev_prop_set_uint64(dev, "size", size);
49     sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
50 
51     sysbus_mmio_map_overlap(SYS_BUS_DEVICE(dev), 0, base, -1000);
52 }
53 
54 #endif
55