Michael Ellerman <m...@ellerman.id.au> a écrit :
Christophe Leroy <christophe.le...@c-s.fr> writes:
After reactivation of data translation by modifying MSR[DR], a isync
is required to ensure the translation is effective.
Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr>
---
Rebased on powerpc/merge-test
@mpe: If not too late:
- change to head_32.h should be squashed into "powerpc/32: prepare
for CONFIG_VMAP_STACK"
- change to head_32.S should be squashed into "powerpc/32s: Enable
CONFIG_VMAP_STACK"
Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr>
---
arch/powerpc/kernel/head_32.S | 1 +
arch/powerpc/kernel/head_32.h | 2 ++
2 files changed, 3 insertions(+)
diff --git a/arch/powerpc/kernel/head_32.h b/arch/powerpc/kernel/head_32.h
index 73a035b40dbf..a6a5fbbf8504 100644
--- a/arch/powerpc/kernel/head_32.h
+++ b/arch/powerpc/kernel/head_32.h
@@ -43,6 +43,7 @@
.ifeq \for_rtas
li r11, MSR_KERNEL & ~(MSR_IR | MSR_RI) /* can take DTLB miss */
mtmsr r11
+ isync
Actually this one leads to:
/home/michael/linux/arch/powerpc/kernel/head_8xx.S: Assembler messages:
/home/michael/linux/arch/powerpc/kernel/head_8xx.S:151: Error:
attempt to move .org backwards
make[3]: *** [/home/michael/linux/scripts/Makefile.build:348:
arch/powerpc/kernel/head_8xx.o] Error 1
For mpc885_ads_defconfig.
That's the alignment exception overflowing into the program check
handler:
/* Alignment exception */
. = 0x600
Alignment:
EXCEPTION_PROLOG handle_dar_dsisr=1
save_dar_dsisr_on_stack r4, r5, r11
li r6, RPN_PATTERN
mtspr SPRN_DAR, r6 /* Tag DAR, to be used in DTLB Error */
addi r3,r1,STACK_FRAME_OVERHEAD
EXC_XFER_STD(0x600, alignment_exception)
/* Program check exception */
EXCEPTION(0x700, ProgramCheck, program_check_exception, EXC_XFER_STD)
Can't see an obvious/easy way to fix it.
Argh !
I think the easiest is to move the EXC_XFER_STD(0x600,
alignment_exception) somewhere else and branch to it. There is some
space at .0xa00
Christophe
PS: I'm afk until monday
