From f5095aa3805f8cf91c4df6e7e1dab0d914bc40bc Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Tue, 7 Feb 2017 18:30:00 +0000 Subject: hw/misc: New "unimplemented" sysbus device MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Alex Bennée Message-id: 1484247815-15279-3-git-send-email-peter.maydell@linaro.org --- include/hw/misc/unimp.h | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 include/hw/misc/unimp.h (limited to 'include/hw/misc/unimp.h') diff --git a/include/hw/misc/unimp.h b/include/hw/misc/unimp.h new file mode 100644 index 0000000000..3462d85836 --- /dev/null +++ b/include/hw/misc/unimp.h @@ -0,0 +1,39 @@ +/* + * "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 -- cgit 1.4.1