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
  15 #define TYPE_UNIMPLEMENTED_DEVICE "unimplemented-device"
  16
  17 #define UNIMPLEMENTED_DEVICE(obj) \
  18     OBJECT_CHECK(UnimplementedDeviceState, (obj), TYPE_UNIMPLEMENTED_DEVICE)
  19
  20 typedef struct {
  21     SysBusDevice parent_obj;
  22     MemoryRegion iomem;
  23     char *name;
  24     uint64_t size;
  25 } UnimplementedDeviceState;
  26
  27 /**
  28  * create_unimplemented_device: create and map a dummy device
  29  * @name: name of the device for debug logging
  30  * @base: base address of the device's MMIO region
  31  * @size: size of the device's MMIO region
  32  *
  33  * This utility function creates and maps an instance of unimplemented-device,
  34  * which is a dummy device which simply logs all guest accesses to
  35  * it via the qemu_log LOG_UNIMP debug log.
  36  * The device is mapped at priority -1000, which means that you can
  37  * use it to cover a large region and then map other devices on top of it
  38  * if necessary.
  39  */
  40 static inline void create_unimplemented_device(const char *name,
  41                                                hwaddr base,
  42                                                hwaddr size)
  43 {
  44     DeviceState *dev = qdev_new(TYPE_UNIMPLEMENTED_DEVICE);
  45
  46     qdev_prop_set_string(dev, "name", name);
  47     qdev_prop_set_uint64(dev, "size", size);
  48     sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
  49
  50     sysbus_mmio_map_overlap(SYS_BUS_DEVICE(dev), 0, base, -1000);
  51 }
  52
  53 #endif