projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 10b663ae CM |
1 | /* |
| 2 | * Based on arch/arm/include/asm/barrier.h | |
| 3 | * | |
| 4 | * Copyright (C) 2012 ARM Ltd. | |
| 5 | * | |
| 6 | * This program is free software; you can redistribute it and/or modify | |
| 7 | * it under the terms of the GNU General Public License version 2 as | |
| 8 | * published by the Free Software Foundation. | |
| 9 | * | |
| 10 | * This program is distributed in the hope that it will be useful, | |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 | * GNU General Public License for more details. | |
| 14 | * | |
| 15 | * You should have received a copy of the GNU General Public License | |
| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 17 | */ | |
| 18 | #ifndef __ASM_BARRIER_H | |
| 19 | #define __ASM_BARRIER_H | |
| 20 | ||
| 21 | #ifndef __ASSEMBLY__ | |
| 22 | ||
| 23 | #define sev() asm volatile("sev" : : : "memory") | |
| 24 | #define wfe() asm volatile("wfe" : : : "memory") | |
| 25 | #define wfi() asm volatile("wfi" : : : "memory") | |
| 26 | ||
| 27 | #define isb() asm volatile("isb" : : : "memory") | |
| d152d22a | 28 | #define dmb(opt) asm volatile("dmb sy" : : : "memory") |
| 4a7ac12e | 29 | #define dsb(opt) asm volatile("dsb sy" : : : "memory") |
| 10b663ae CM |
30 | |
| 31 | #define mb() dsb() | |
| 32 | #define rmb() asm volatile("dsb ld" : : : "memory") | |
| 33 | #define wmb() asm volatile("dsb st" : : : "memory") | |
| 34 | ||
| 35 | #ifndef CONFIG_SMP | |
| 36 | #define smp_mb() barrier() | |
| 37 | #define smp_rmb() barrier() | |
| 38 | #define smp_wmb() barrier() | |
| 47933ad4 PZ |
39 | |
| 40 | #define smp_store_release(p, v) \ | |
| 41 | do { \ | |
| 42 | compiletime_assert_atomic_type(*p); \ | |
| 43 | smp_mb(); \ | |
| 44 | ACCESS_ONCE(*p) = (v); \ | |
| 45 | } while (0) | |
| 46 | ||
| 47 | #define smp_load_acquire(p) \ | |
| 48 | ({ \ | |
| 49 | typeof(*p) ___p1 = ACCESS_ONCE(*p); \ | |
| 50 | compiletime_assert_atomic_type(*p); \ | |
| 51 | smp_mb(); \ | |
| 52 | ___p1; \ | |
| 53 | }) | |
| 54 | ||
| 10b663ae | 55 | #else |
| 47933ad4 | 56 | |
| 10b663ae CM |
57 | #define smp_mb() asm volatile("dmb ish" : : : "memory") |
| 58 | #define smp_rmb() asm volatile("dmb ishld" : : : "memory") | |
| 59 | #define smp_wmb() asm volatile("dmb ishst" : : : "memory") | |
| 47933ad4 PZ |
60 | |
| 61 | #define smp_store_release(p, v) \ | |
| 62 | do { \ | |
| 63 | compiletime_assert_atomic_type(*p); \ | |
| 64 | switch (sizeof(*p)) { \ | |
| 65 | case 4: \ | |
| 66 | asm volatile ("stlr %w1, %0" \ | |
| 67 | : "=Q" (*p) : "r" (v) : "memory"); \ | |
| 68 | break; \ | |
| 69 | case 8: \ | |
| 70 | asm volatile ("stlr %1, %0" \ | |
| 71 | : "=Q" (*p) : "r" (v) : "memory"); \ | |
| 72 | break; \ | |
| 73 | } \ | |
| 74 | } while (0) | |
| 75 | ||
| 76 | #define smp_load_acquire(p) \ | |
| 77 | ({ \ | |
| 78 | typeof(*p) ___p1; \ | |
| 79 | compiletime_assert_atomic_type(*p); \ | |
| 80 | switch (sizeof(*p)) { \ | |
| 81 | case 4: \ | |
| 82 | asm volatile ("ldar %w0, %1" \ | |
| 83 | : "=r" (___p1) : "Q" (*p) : "memory"); \ | |
| 84 | break; \ | |
| 85 | case 8: \ | |
| 86 | asm volatile ("ldar %0, %1" \ | |
| 87 | : "=r" (___p1) : "Q" (*p) : "memory"); \ | |
| 88 | break; \ | |
| 89 | } \ | |
| 90 | ___p1; \ | |
| 91 | }) | |
| 92 | ||
| 10b663ae CM |
93 | #endif |
| 94 | ||
| 95 | #define read_barrier_depends() do { } while(0) | |
| 96 | #define smp_read_barrier_depends() do { } while(0) | |
| 97 | ||
| 98 | #define set_mb(var, value) do { var = value; smp_mb(); } while (0) | |
| 99 | #define nop() asm volatile("nop"); | |
| 100 | ||
| 101 | #endif /* __ASSEMBLY__ */ | |
| 102 | ||
| 103 | #endif /* __ASM_BARRIER_H */ |