[PATCH] purgatory/arch/ppc64: Reset primary cpu endian to big-endian
Simon Horman
horms at verge.net.au
Tue Sep 1 18:02:51 PDT 2015
[CC linuxppc-dev]
On Fri, Aug 21, 2015 at 12:51:16PM +1000, Samuel Mendoza-Jonas wrote:
> Older big-endian ppc64 kernels don't include the FIXUP_ENDIAN check,
> meaning if we kexec from a little-endian kernel the target kernel will
> fail to boot.
> Returning to big-endian before we enter the target kernel ensures that
> the target kernel can boot whether or not it includes FIXUP_ENDIAN.
>
> This mirrors commit 150b14e7 in kexec-lite.
>
> Signed-off-by: Samuel Mendoza-Jonas <sam.mj at au1.ibm.com>
I would value a review from one of the PPC folks.
> ---
> purgatory/arch/ppc64/v2wrap.S | 12 +++++++++---
> 1 file changed, 9 insertions(+), 3 deletions(-)
>
> diff --git a/purgatory/arch/ppc64/v2wrap.S b/purgatory/arch/ppc64/v2wrap.S
> index dc5034f..179ade9 100644
> --- a/purgatory/arch/ppc64/v2wrap.S
> +++ b/purgatory/arch/ppc64/v2wrap.S
> @@ -114,10 +114,16 @@ master:
> LOADADDR(6,run_at_load) # the load flag
> lwz 7,0(6) # possibly patched by kexec-elf-ppc64
> stw 7,0x5c(4) # and patch it into the kernel
> - li 5,0 # r5 will be 0 for kernel
> - mtctr 4 # prepare branch too
> mr 3,16 # restore dt address
>
> + mtsrr0 4 # prepare branch to
> +
> + mfmsr 5
> + clrrdi 5,5,1 # clear MSR_LE
> + mtsrr1 5
> +
> + li 5,0 # r5 will be 0 for kernel
> +
> # skip cache flush, do we care?
>
> - bctr # start kernel
> + rfid # update MSR and start kernel
> --
> 2.5.0
>
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