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Re: [PATCH v4 2/4] xen: Add files needed for minimal ppc64le build
- To: Shawn Anastasio <sanastasio@xxxxxxxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Fri, 16 Jun 2023 21:27:32 +0100
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- Cc: tpearson@xxxxxxxxxxxxxxxxxxxxx, George Dunlap <george.dunlap@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>
- Delivery-date: Fri, 16 Jun 2023 20:27:54 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16/06/2023 6:48 pm, Shawn Anastasio wrote:
> diff --git a/xen/arch/ppc/ppc64/head.S b/xen/arch/ppc/ppc64/head.S
> new file mode 100644
> index 0000000000..0b289c713a
> --- /dev/null
> +++ b/xen/arch/ppc/ppc64/head.S
> @@ -0,0 +1,27 @@
> +/* SPDX-License-Identifier: GPL-2.0-or-later */
> +
> +.section .text.header, "ax", %progbits
> +
> +ENTRY(start)
> + /*
> + * Depending on how we were booted, the CPU could be running in either
> + * Little Endian or Big Endian mode. The following trampoline from Linux
> + * cleverly uses an instruction that encodes to a NOP if the CPU's
> + * endianness matches the assumption of the assembler (LE, in our case)
> + * or a branch to code that performs the endian switch in the other case.
> + */
Sorry, I also meant to ask. How prevalent is Big Endian in practice in
the Power world?
It's another area (like 4k pages) where I expect there to be plenty of
fun to be had with the codebase.
~Andrew
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