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 54