]> git.baikalelectronics.ru Git - kernel.git/commit
powerpc/boot: Fix the early OPAL console wrappers
authorOliver O'Halloran <oohall@gmail.com>
Wed, 23 Nov 2016 02:55:13 +0000 (13:55 +1100)
committerMichael Ellerman <mpe@ellerman.id.au>
Thu, 24 Nov 2016 06:34:01 +0000 (17:34 +1100)
commit2ac399ff1f19a55d34824cd8068af2f822dc16bb
tree531cebbcf7a6788ca1e140a93e5923ec117ffd5c
parentffa86a70f1df6c061f3c4fcf546717557a6ff036
powerpc/boot: Fix the early OPAL console wrappers

When configured with CONFIG_PPC_EARLY_DEBUG_OPAL=y the kernel expects
the OPAL entry and base addresses to be passed in r8 and r9
respectively. Currently the wrapper does not attempt to restore these
values before entering the decompressed kernel which causes the kernel
to branch into whatever happens to be in r9 when doing a write to the
OPAL console in early boot.

This patch adds a platform_ops hook that can be used to branch into the
new kernel. The OPAL console driver patches this at runtime so that if
the console is used it will be restored just prior to entering the
kernel.

Fixes: 672f18cb4650 ("powerpc/boot: Add OPAL console to epapr wrappers")
Cc: stable@vger.kernel.org # v4.8+
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
arch/powerpc/boot/main.c
arch/powerpc/boot/opal-calls.S
arch/powerpc/boot/opal.c
arch/powerpc/boot/ops.h