diff options
| author | Jeetesh Burman <jburman@nvidia.com> | 2018-02-14 11:50:57 +0530 |
|---|---|---|
| committer | Winnie Hsu <whsu@nvidia.com> | 2018-04-03 10:44:10 -0700 |
| commit | aba332e1dc32edfed73448364f2a88457738a270 (patch) | |
| tree | 158df8249e81a98259f47a137843e67297aa9126 /arch | |
| parent | 763ada650d0d24dde8d4ec90f665f16c8d7edab7 (diff) | |
arm: define speculation barrier
The instruction sequency "dsb sy" followed by "isb" functions as
a speculation barrier, which prevents the instructions after that
from being speculatively executed.
bug 2039126
Change-Id: I898aab771ff82b26b08214a06814d2e6e78969a7
Signed-off-by: Bo Yan <byan@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1618222
Signed-off-by: James Huang <jamehuang@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1650093
Signed-off-by: Jeetesh Burman <jburman@nvidia.com>
(cherry picked from commit f125c60045878513902cac4a084fde9a516eb3e2)
Reviewed-on: https://git-master.nvidia.com/r/1660771
GVS: Gerrit_Virtual_Submit
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/include/asm/barrier.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm/include/asm/barrier.h b/arch/arm/include/asm/barrier.h index b00ef075bc2e..6af46bfa9837 100644 --- a/arch/arm/include/asm/barrier.h +++ b/arch/arm/include/asm/barrier.h @@ -79,5 +79,9 @@ do { \ #define set_mb(var, value) do { var = value; smp_mb(); } while (0) +#define speculation_barrier() \ + asm volatile( "dsb sy\n" \ + "isb\n" : : : "memory") + #endif /* !__ASSEMBLY__ */ #endif /* __ASM_BARRIER_H */ |