qemu/include/hw/misc/unimp.h
Peter Maydell f5095aa380 hw/misc: New "unimplemented" sysbus device
Create a new "unimplemented" sysbus device, which simply accepts
all read and write accesses, and implements them as read-as-zero,
write-ignored, with logging of the access as LOG_UNIMP.

This is useful for stubbing out bits of an SoC or board model
which haven't been written yet.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 1484247815-15279-3-git-send-email-peter.maydell@linaro.org
2017-02-07 18:55:15 +00:00

40 lines
1.2 KiB
C

/*
* "Unimplemented" device
*
* Copyright Linaro Limited, 2017
* Written by Peter Maydell
*/
#ifndef HW_MISC_UNIMP_H
#define HW_MISC_UNIMP_H
#define TYPE_UNIMPLEMENTED_DEVICE "unimplemented-device"
/**
* 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_create(NULL, TYPE_UNIMPLEMENTED_DEVICE);
qdev_prop_set_string(dev, "name", name);
qdev_prop_set_uint64(dev, "size", size);
qdev_init_nofail(dev);
sysbus_mmio_map_overlap(SYS_BUS_DEVICE(dev), 0, base, -1000);
}
#endif