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/sysbus.h"
  12
  13 #define TYPE_UNIMPLEMENTED_DEVICE "unimplemented-device"
  14
  15 #define UNIMPLEMENTED_DEVICE(obj) \
  16     OBJECT_CHECK(UnimplementedDeviceState, (obj), TYPE_UNIMPLEMENTED_DEVICE)
  17
  18 typedef struct {
  19     SysBusDevice parent_obj;
  20     MemoryRegion iomem;
  21     char *name;
  22     uint64_t size;
  23 } UnimplementedDeviceState;
  24
  25 /**
  26  * create_unimplemented_device: create and map a dummy device
  27  * @name: name of the device for debug logging
  28  * @base: base address of the device's MMIO region
  29  * @size: size of the device's MMIO region
  30  *
  31  * This utility function creates and maps an instance of unimplemented-device,
  32  * which is a dummy device which simply logs all guest accesses to
  33  * it via the qemu_log LOG_UNIMP debug log.
  34  * The device is mapped at priority -1000, which means that you can
  35  * use it to cover a large region and then map other devices on top of it
  36  * if necessary.
  37  */
  38 static inline void create_unimplemented_device(const char *name,
  39                                                hwaddr base,
  40                                                hwaddr size)
  41 {
  42     DeviceState *dev = qdev_create(NULL, TYPE_UNIMPLEMENTED_DEVICE);
  43
  44     qdev_prop_set_string(dev, "name", name);
  45     qdev_prop_set_uint64(dev, "size", size);
  46     qdev_init_nofail(dev);
  47
  48     sysbus_mmio_map_overlap(SYS_BUS_DEVICE(dev), 0, base, -1000);
  49 }
  50
  51 #endif