1 files changed, 54 insertions, 0 deletions
diff --git a/include/hw/misc/unimp.h b/include/hw/misc/unimp.h
new file mode 100644
index 000000000..518d627dc
--- /dev/null
+++ b/include/hw/misc/unimp.h
@@ -0,0 +1,54 @@
+/*
+ * "Unimplemented" device
+ *
+ * Copyright Linaro Limited, 2017
+ * Written by Peter Maydell
+ */
+
+#ifndef HW_MISC_UNIMP_H
+#define HW_MISC_UNIMP_H
+
+#include "hw/qdev-properties.h"
+#include "hw/sysbus.h"
+#include "qapi/error.h"
+#include "qom/object.h"
+
+#define TYPE_UNIMPLEMENTED_DEVICE "unimplemented-device"
+
+OBJECT_DECLARE_SIMPLE_TYPE(UnimplementedDeviceState, UNIMPLEMENTED_DEVICE)
+
+struct UnimplementedDeviceState {
+    SysBusDevice parent_obj;
+    MemoryRegion iomem;
+    unsigned offset_fmt_width;
+    char *name;
+    uint64_t size;
+};
+
+/**
+ * create_unimplemented_device: create and map a dummy device
+ * @name: name of the device for debug logging
+ * @base: base address of the device's MMIO region
+ * @size: size of the device's MMIO region
+ *
+ * This utility function creates and maps an instance of unimplemented-device,
+ * which is a dummy device which simply logs all guest accesses to
+ * it via the qemu_log LOG_UNIMP debug log.
+ * The device is mapped at priority -1000, which means that you can
+ * use it to cover a large region and then map other devices on top of it
+ * if necessary.
+ */
+static inline void create_unimplemented_device(const char *name,
+                                               hwaddr base,
+                                               hwaddr size)
+{
+    DeviceState *dev = qdev_new(TYPE_UNIMPLEMENTED_DEVICE);
+
+    qdev_prop_set_string(dev, "name", name);
+    qdev_prop_set_uint64(dev, "size", size);
+    sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal);
+
+    sysbus_mmio_map_overlap(SYS_BUS_DEVICE(dev), 0, base, -1000);
+}
+
+#endif