include/hw/misc/unimp.h

   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  */
  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