Commit a78d1565 authored by Russell King's avatar Russell King
Browse files

ARM: spectre-v1: add speculation barrier (csdb) macros



Add assembly and C macros for the new CSDB instruction.
Signed-off-by: default avatarRussell King <rmk+kernel@armlinux.org.uk>
Acked-by: default avatarMark Rutland <mark.rutland@arm.com>
Boot-tested-by: default avatarTony Lindgren <tony@atomide.com>
Reviewed-by: default avatarTony Lindgren <tony@atomide.com>
parent add56098
......@@ -447,6 +447,14 @@ THUMB( orr \reg , \reg , #PSR_T_BIT )
.size \name , . - \name
.endm
.macro csdb
#ifdef CONFIG_THUMB2_KERNEL
.inst.w 0xf3af8014
#else
.inst 0xe320f014
#endif
.endm
.macro check_uaccess, addr:req, size:req, limit:req, tmp:req, bad:req
#ifndef CONFIG_CPU_USE_DOMAINS
adds \tmp, \addr, #\size - 1
......
......@@ -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);
......
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