Re: [Qemu-devel] [PATCH 14/14] tests/boot-serial-test: Add support for the aarch64 virt machine

[Eric Blake]

On 02/08/2018 02:09 PM, Thomas Huth wrote:
> From: Wei Huang <address@hidden>
>
> This patch adds a small binary kernel to test aarch64 virt machine's
> UART.
>
> Signed-off-by: Wei Huang <address@hidden>
> [thuth: Fixed contextual conflict with the hppa patch]
> Signed-off-by: Thomas Huth <address@hidden>
> ---
>   tests/Makefile.include   | 1 +
>   tests/boot-serial-test.c | 9 +++++++++
>   2 files changed, 10 insertions(+)

> +++ b/tests/boot-serial-test.c
> @@ -55,6 +55,13 @@ static const uint8_t bios_raspi2[] = {
>       0x00, 0x10, 0x20, 0x3f,                 /* 0x3f201000 = UART0 base addr */
>   };
>   
> +static const uint8_t kernel_aarch64[] = {
> +    0x81, 0x0a, 0x80, 0x52,                 /* mov     w1, #0x54 */
> +    0x02, 0x20, 0xa1, 0xd2,                 /* mov     x2, #0x9000000 */
> +    0x41, 0x00, 0x00, 0x39,                 /* strb    w1, [x2] */
> +    0xfd, 0xff, 0xff, 0x17,                 /* b       -12 (loop) */
> +};

Code like this reminds me of the 1984 IOCCC winner 
(https://www.ioccc.org/1984/mullender/mullender.c) - there's just 
something strangely satisfying about an array of integers being compiled 
into executable code ;)

Reviewed-by: Eric Blake <address@hidden>

--
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org