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authorAnton Blanchard <anton@samba.org>2010-02-07 20:37:29 +0100
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2010-02-09 03:56:24 +0100
commit44c9f3cc1a07503b653b571eac5792436da39a30 (patch)
treedf99ffef915bf949b112e24323e6bf80139d94d3 /arch/powerpc/kernel/entry_64.S
parentpowerpc: Remove trailing space in messages (diff)
downloadlinux-44c9f3cc1a07503b653b571eac5792436da39a30.tar.xz
linux-44c9f3cc1a07503b653b571eac5792436da39a30.zip
powerpc: Clear MSR_RI during RTAS calls
RTAS should never cause an exception but if it does (for example accessing outside our RMO) then we might go a long way through the kernel before oopsing. If we unset MSR_RI we should at least stop things on exception exit. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/kernel/entry_64.S')
-rw-r--r--arch/powerpc/kernel/entry_64.S3
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index bdcb557d470a..07109d843787 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -791,9 +791,8 @@ _GLOBAL(enter_rtas)
li r9,1
rldicr r9,r9,MSR_SF_LG,(63-MSR_SF_LG)
- ori r9,r9,MSR_IR|MSR_DR|MSR_FE0|MSR_FE1|MSR_FP
+ ori r9,r9,MSR_IR|MSR_DR|MSR_FE0|MSR_FE1|MSR_FP|MSR_RI
andc r6,r0,r9
- ori r6,r6,MSR_RI
sync /* disable interrupts so SRR0/1 */
mtmsrd r0 /* don't get trashed */