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Diffstat (limited to 'arch/arm/include/asm/barriers.h')
| -rw-r--r-- | arch/arm/include/asm/barriers.h | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/arch/arm/include/asm/barriers.h b/arch/arm/include/asm/barriers.h new file mode 100644 index 0000000000..37870f9d71 --- /dev/null +++ b/arch/arm/include/asm/barriers.h @@ -0,0 +1,44 @@ +/* + * Copyright (C) 2016 ARM Ltd. + * + * ARM and ARM64 barrier instructions + * split from armv7.h to allow sharing between ARM and ARM64 + * + * Original copyright in armv7.h was: + * (C) Copyright 2010 Texas Instruments, <www.ti.com> Aneesh V <aneesh@ti.com> + * + * Much of the original barrier code was contributed by: + * Valentine Barshak <valentine.barshak@cogentembedded.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ +#ifndef __BARRIERS_H__ +#define __BARRIERS_H__ + +#ifndef __ASSEMBLY__ + +#ifndef CONFIG_ARM64 +/* + * CP15 Barrier instructions + * Please note that we have separate barrier instructions in ARMv7 + * However, we use the CP15 based instructtions because we use + * -march=armv5 in U-Boot + */ +#define CP15ISB asm volatile ("mcr p15, 0, %0, c7, c5, 4" : : "r" (0)) +#define CP15DSB asm volatile ("mcr p15, 0, %0, c7, c10, 4" : : "r" (0)) +#define CP15DMB asm volatile ("mcr p15, 0, %0, c7, c10, 5" : : "r" (0)) + +#endif /* !CONFIG_ARM64 */ + +#if defined(__ARM_ARCH_7A__) || defined(CONFIG_ARM64) +#define ISB asm volatile ("isb sy" : : : "memory") +#define DSB asm volatile ("dsb sy" : : : "memory") +#define DMB asm volatile ("dmb sy" : : : "memory") +#else +#define ISB CP15ISB +#define DSB CP15DSB +#define DMB CP15DMB +#endif + +#endif /* __ASSEMBLY__ */ +#endif /* __BARRIERS_H__ */ |