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
