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authorMarc Zyngier <Marc.Zyngier@arm.com>2013-01-30 18:17:49 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-01-09 12:24:26 -0800
commit3db87d4c3af23cb360f443c1a8b0c0b4278b9f6b (patch)
treeaa77e54ca54769b93c5d1abbc56bd56b19d3784d /arch/arm
parent714c21cb90951905b269870087a99c37f3a7af0c (diff)
ARM: hyp: initialize CNTVOFF to zero
commit 0af0b189abf73d232af782df2f999235cd2fed7f upstream. In order to be able to use the virtual counter in a safe way, make sure it is initialized to zero before dropping to SVC. Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Cc: Dave Martin <dave.martin@linaro.org> Cc: Mark Brown <broonie@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/kernel/hyp-stub.S2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm/kernel/hyp-stub.S b/arch/arm/kernel/hyp-stub.S
index 1315c4ccfa5..dbe21107945 100644
--- a/arch/arm/kernel/hyp-stub.S
+++ b/arch/arm/kernel/hyp-stub.S
@@ -153,6 +153,8 @@ THUMB( orr r7, #(1 << 30) ) @ HSCTLR.TE
mrc p15, 4, r7, c14, c1, 0 @ CNTHCTL
orr r7, r7, #3 @ PL1PCEN | PL1PCTEN
mcr p15, 4, r7, c14, c1, 0 @ CNTHCTL
+ mov r7, #0
+ mcrr p15, 4, r7, r7, c14 @ CNTVOFF
1:
#endif