[PATCH] purgatory/arch/ppc64: Reset primary cpu endian to big-endian

[Samuel Mendoza-Jonas]

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>
---
 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