diff options
| author | James Huang <jamehuang@nvidia.com> | 2018-02-01 13:01:50 +0800 |
|---|---|---|
| committer | Winnie Hsu <whsu@nvidia.com> | 2018-04-03 10:44:59 -0700 |
| commit | 946ad0dedcd475c32e4c455d21c5c6df12caa6f7 (patch) | |
| tree | c10b3a0ea2b39733f0f244238abcc7966febb304 /arch | |
| parent | 68bd404adda3b13e3a5a465696ec85647f08dbdf (diff) | |
arm64: 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: Ie3b7b873a12002617e60510ed8759bdaa7cd7057
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/1660782
GVS: Gerrit_Virtual_Submit
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/include/asm/barrier.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/barrier.h b/arch/arm64/include/asm/barrier.h index 9269edba2c90..8059ead5f2d6 100644 --- a/arch/arm64/include/asm/barrier.h +++ b/arch/arm64/include/asm/barrier.h @@ -99,6 +99,10 @@ do { \ #define set_mb(var, value) do { var = value; smp_mb(); } while (0) #define nop() asm volatile("nop"); +#define speculation_barrier() \ + asm volatile( "dsb sy\n" \ + "isb\n" : : : "memory") + #endif /* __ASSEMBLY__ */ #endif /* __ASM_BARRIER_H */ |