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| author | Russell King <rmk+kernel@armlinux.org.uk> | 2018-05-11 12:15:29 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2018-06-01 00:27:16 +0200 |
| commit | a78d156587931a2c3b354534aa772febf6c9e855 (patch) | |
| tree | e76fd07a3833a1e3a91ad3c86a19a736a39033f4 /arch/arm/include/asm/barrier.h | |
| parent | ARM: KVM: report support for SMCCC_ARCH_WORKAROUND_1 (diff) | |
| download | linux-a78d156587931a2c3b354534aa772febf6c9e855.tar.xz linux-a78d156587931a2c3b354534aa772febf6c9e855.zip | |
ARM: spectre-v1: add speculation barrier (csdb) macros
Add assembly and C macros for the new CSDB instruction.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Boot-tested-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch/arm/include/asm/barrier.h')
| -rw-r--r-- | arch/arm/include/asm/barrier.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/arm/include/asm/barrier.h b/arch/arm/include/asm/barrier.h index 40f5c410fd8c..3d9c1d4b7e75 100644 --- a/arch/arm/include/asm/barrier.h +++ b/arch/arm/include/asm/barrier.h @@ -17,6 +17,12 @@ #define isb(option) __asm__ __volatile__ ("isb " #option : : : "memory") #define dsb(option) __asm__ __volatile__ ("dsb " #option : : : "memory") #define dmb(option) __asm__ __volatile__ ("dmb " #option : : : "memory") +#ifdef CONFIG_THUMB2_KERNEL +#define CSDB ".inst.w 0xf3af8014" +#else +#define CSDB ".inst 0xe320f014" +#endif +#define csdb() __asm__ __volatile__(CSDB : : : "memory") #elif defined(CONFIG_CPU_XSC3) || __LINUX_ARM_ARCH__ == 6 #define isb(x) __asm__ __volatile__ ("mcr p15, 0, %0, c7, c5, 4" \ : : "r" (0) : "memory") @@ -37,6 +43,13 @@ #define dmb(x) __asm__ __volatile__ ("" : : : "memory") #endif +#ifndef CSDB +#define CSDB +#endif +#ifndef csdb +#define csdb() +#endif + #ifdef CONFIG_ARM_HEAVY_MB extern void (*soc_mb)(void); extern void arm_heavy_mb(void); |