1 /* SPDX-License-Identifier: GPL-2.0 */ 2 3 #ifndef __ASM_CSKY_BARRIER_H 4 #define __ASM_CSKY_BARRIER_H 5 6 #ifndef __ASSEMBLY__ 7 8 #define nop() asm volatile ("nop\n":::"memory") 9 10 #ifdef CONFIG_SMP 11 12 /* 13 * bar.brwarws: ordering barrier for all load/store instructions 14 * before/after 15 * 16 * |31|30 26|25 21|20 16|15 10|9 5|4 0| 17 * 1 10000 00000 00000 100001 00001 0 bw br aw ar 18 * 19 * b: before 20 * a: after 21 * r: read 22 * w: write 23 * 24 * Here are all combinations: 25 * 26 * bar.brw 27 * bar.br 28 * bar.bw 29 * bar.arw 30 * bar.ar 31 * bar.aw 32 * bar.brwarw 33 * bar.brarw 34 * bar.bwarw 35 * bar.brwar 36 * bar.brwaw 37 * bar.brar 38 * bar.bwaw 39 */ 40 #define FULL_FENCE ".long 0x842fc000\n" 41 #define ACQUIRE_FENCE ".long 0x8427c000\n" 42 #define RELEASE_FENCE ".long 0x842ec000\n" 43 44 #define __bar_brw() asm volatile (".long 0x842cc000\n":::"memory") 45 #define __bar_br() asm volatile (".long 0x8424c000\n":::"memory") 46 #define __bar_bw() asm volatile (".long 0x8428c000\n":::"memory") 47 #define __bar_arw() asm volatile (".long 0x8423c000\n":::"memory") 48 #define __bar_ar() asm volatile (".long 0x8421c000\n":::"memory") 49 #define __bar_aw() asm volatile (".long 0x8422c000\n":::"memory") 50 #define __bar_brwarw() asm volatile (FULL_FENCE:::"memory") 51 #define __bar_brarw() asm volatile (ACQUIRE_FENCE:::"memory") 52 #define __bar_bwarw() asm volatile (".long 0x842bc000\n":::"memory") 53 #define __bar_brwar() asm volatile (".long 0x842dc000\n":::"memory") 54 #define __bar_brwaw() asm volatile (RELEASE_FENCE:::"memory") 55 #define __bar_brar() asm volatile (".long 0x8425c000\n":::"memory") 56 #define __bar_brar() asm volatile (".long 0x8425c000\n":::"memory") 57 #define __bar_bwaw() asm volatile (".long 0x842ac000\n":::"memory") 58 59 #define __smp_mb() __bar_brwarw() 60 #define __smp_rmb() __bar_brar() 61 #define __smp_wmb() __bar_bwaw() 62 63 #define __smp_acquire_fence() __bar_brarw() 64 #define __smp_release_fence() __bar_brwaw() 65 66 #endif /* CONFIG_SMP */ 67 68 /* 69 * sync: completion barrier, all sync.xx instructions 70 * guarantee the last response received by bus transaction 71 * made by ld/st instructions before sync.s 72 * sync.s: inherit from sync, but also shareable to other cores 73 * sync.i: inherit from sync, but also flush cpu pipeline 74 * sync.is: the same with sync.i + sync.s 75 */ 76 #define mb() asm volatile ("sync\n":::"memory") 77 78 #ifdef CONFIG_CPU_HAS_CACHEV2 79 /* 80 * Using three sync.is to prevent speculative PTW 81 */ 82 #define sync_is() asm volatile ("sync.is\nsync.is\nsync.is\n":::"memory") 83 #endif 84 85 #include <asm-generic/barrier.h> 86 87 #endif /* __ASSEMBLY__ */ 88 #endif /* __ASM_CSKY_BARRIER_H */ 89