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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

arch/arm/include/asm/assembler.h

+8 −0
Original line number Diff line number Diff line
@@ -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

arch/arm/include/asm/barrier.h

+13 −0
Original line number Diff line number Diff line
@@ -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);