| /* SPDX-License-Identifier: GPL-2.0 */ |
| |
| #ifndef __ASM_CSKY_BARRIER_H |
| #define __ASM_CSKY_BARRIER_H |
| |
| #ifndef __ASSEMBLY__ |
| |
| #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 FULL_FENCE ".long 0x842fc000\n" |
| #define ACQUIRE_FENCE ".long 0x8427c000\n" |
| #define RELEASE_FENCE ".long 0x842ec000\n" |
| |
| #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 (FULL_FENCE:::"memory") |
| #define __bar_brarw() asm volatile (ACQUIRE_FENCE:::"memory") |
| #define __bar_bwarw() asm volatile (".long 0x842bc000\n":::"memory") |
| #define __bar_brwar() asm volatile (".long 0x842dc000\n":::"memory") |
| #define __bar_brwaw() asm volatile (RELEASE_FENCE:::"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 __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 received by bus transaction |
| * made by ld/st instructions before sync.s |
| * 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 |
| */ |
| #define mb() asm volatile ("sync\n":::"memory") |
| |
| #ifdef CONFIG_CPU_HAS_CACHEV2 |
| /* |
| * 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> |
| |
| #endif /* __ASSEMBLY__ */ |
| #endif /* __ASM_CSKY_BARRIER_H */ |
