diff options
Diffstat (limited to 'arch/csky/include/asm/barrier.h')
| -rw-r--r-- | arch/csky/include/asm/barrier.h | 83 |
1 files changed, 60 insertions, 23 deletions
diff --git a/arch/csky/include/asm/barrier.h b/arch/csky/include/asm/barrier.h index a430e7fddf35..84fc600c8b45 100644 --- a/arch/csky/include/asm/barrier.h +++ b/arch/csky/include/asm/barrier.h @@ -1,5 +1,4 @@ /* SPDX-License-Identifier: GPL-2.0 */ -// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd. #ifndef __ASM_CSKY_BARRIER_H #define __ASM_CSKY_BARRIER_H @@ -8,6 +7,61 @@ #define nop() asm volatile ("nop\n":::"memory") +#ifdef CONFIG_SMP + +/* + * bar.brwarws: ordering barrier for all load/store instructions + * before/after + * + * |31|30 26|25 21|20 16|15 10|9 5|4 0| + * 1 10000 00000 00000 100001 00001 0 bw br aw ar + * + * b: before + * a: after + * r: read + * w: write + * + * Here are all combinations: + * + * bar.brw + * bar.br + * bar.bw + * bar.arw + * bar.ar + * bar.aw + * bar.brwarw + * bar.brarw + * bar.bwarw + * bar.brwar + * bar.brwaw + * bar.brar + * bar.bwaw + */ +#define __bar_brw() asm volatile (".long 0x842cc000\n":::"memory") +#define __bar_br() asm volatile (".long 0x8424c000\n":::"memory") +#define __bar_bw() asm volatile (".long 0x8428c000\n":::"memory") +#define __bar_arw() asm volatile (".long 0x8423c000\n":::"memory") +#define __bar_ar() asm volatile (".long 0x8421c000\n":::"memory") +#define __bar_aw() asm volatile (".long 0x8422c000\n":::"memory") +#define __bar_brwarw() asm volatile (".long 0x842fc000\n":::"memory") +#define __bar_brarw() asm volatile (".long 0x8427c000\n":::"memory") +#define __bar_bwarw() asm volatile (".long 0x842bc000\n":::"memory") +#define __bar_brwar() asm volatile (".long 0x842dc000\n":::"memory") +#define __bar_brwaw() asm volatile (".long 0x842ec000\n":::"memory") +#define __bar_brar() asm volatile (".long 0x8425c000\n":::"memory") +#define __bar_brar() asm volatile (".long 0x8425c000\n":::"memory") +#define __bar_bwaw() asm volatile (".long 0x842ac000\n":::"memory") + +#define __smp_mb() __bar_brwarw() +#define __smp_rmb() __bar_brar() +#define __smp_wmb() __bar_bwaw() + +#define ACQUIRE_FENCE ".long 0x8427c000\n" +#define __smp_acquire_fence() __bar_brarw() +#define __smp_release_fence() __bar_brwaw() + +#endif /* CONFIG_SMP */ + /* * sync: completion barrier, all sync.xx instructions * guarantee the last response recieved by bus transaction @@ -15,31 +69,14 @@ * sync.s: inherit from sync, but also shareable to other cores * sync.i: inherit from sync, but also flush cpu pipeline * sync.is: the same with sync.i + sync.s - * - * bar.brwarw: ordering barrier for all load/store instructions before it - * bar.brwarws: ordering barrier for all load/store instructions before it - * and shareable to other cores - * bar.brar: ordering barrier for all load instructions before it - * bar.brars: ordering barrier for all load instructions before it - * and shareable to other cores - * bar.bwaw: ordering barrier for all store instructions before it - * bar.bwaws: ordering barrier for all store instructions before it - * and shareable to other cores */ +#define mb() asm volatile ("sync\n":::"memory") #ifdef CONFIG_CPU_HAS_CACHEV2 -#define mb() asm volatile ("sync.s\n":::"memory") - -#ifdef CONFIG_SMP -#define __smp_mb() asm volatile ("bar.brwarws\n":::"memory") -#define __smp_rmb() asm volatile ("bar.brars\n":::"memory") -#define __smp_wmb() asm volatile ("bar.bwaws\n":::"memory") -#endif /* CONFIG_SMP */ - -#define sync_is() asm volatile ("sync.is\n":::"memory") - -#else /* !CONFIG_CPU_HAS_CACHEV2 */ -#define mb() asm volatile ("sync\n":::"memory") +/* + * Using three sync.is to prevent speculative PTW + */ +#define sync_is() asm volatile ("sync.is\nsync.is\nsync.is\n":::"memory") #endif #include <asm-generic/barrier.h> |