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powerpc/kexec: Reset secondary cpu endianness before kexec

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If the target kernel does not inlcude the FIXUP_ENDIAN check, coming
from a different-endian kernel will cause the target kernel to panic.
All ppc64 kernels can handle starting in big-endian mode, so return to
big-endian before branching into the target kernel.

This mainly affects pseries as secondaries on powernv are returned to
OPAL.

Signed-off-by: Samuel Mendoza-Jonas <sam.mj@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Samuel Mendoza-Jonas 2015-07-22 15:50:50 +10:00 committed by Michael Ellerman
parent 480798044e
commit ffebf5f391
1 changed files with 11 additions and 2 deletions
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13
arch/powerpc/kernel/misc_64.S
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@ -475,9 +475,18 @@ _GLOBAL(kexec_wait)
#ifdef CONFIG_KEXEC /* use no memory without kexec */
lwz r4,0(r5)
cmpwi 0,r4,0
bnea 0x60
beq 99b
#ifdef CONFIG_PPC_BOOK3S_64
li r10,0x60
mfmsr r11
clrrdi r11,r11,1 /* Clear MSR_LE */
mtsrr0 r10
mtsrr1 r11
rfid
#else
ba 0x60
#endif
#endif
b 99b
/* this can be in text because we won't change it until we are
* running in real anyways