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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") | |
493e6874 WD |
28 | #define dmb(opt) asm volatile("dmb " #opt : : : "memory") |
29 | #define dsb(opt) asm volatile("dsb " #opt : : : "memory") | |
10b663ae | 30 | |
98f7685e | 31 | #define mb() dsb(sy) |
493e6874 WD |
32 | #define rmb() dsb(ld) |
33 | #define wmb() dsb(st) | |
10b663ae | 34 | |
1077fa36 AD |
35 | #define dma_rmb() dmb(oshld) |
36 | #define dma_wmb() dmb(oshst) | |
37 | ||
10b663ae CM |
38 | #ifndef CONFIG_SMP |
39 | #define smp_mb() barrier() | |
40 | #define smp_rmb() barrier() | |
41 | #define smp_wmb() barrier() | |
47933ad4 PZ |
42 | |
43 | #define smp_store_release(p, v) \ | |
44 | do { \ | |
45 | compiletime_assert_atomic_type(*p); \ | |
be6209a6 | 46 | barrier(); \ |
47933ad4 PZ |
47 | ACCESS_ONCE(*p) = (v); \ |
48 | } while (0) | |
49 | ||
50 | #define smp_load_acquire(p) \ | |
51 | ({ \ | |
52 | typeof(*p) ___p1 = ACCESS_ONCE(*p); \ | |
53 | compiletime_assert_atomic_type(*p); \ | |
be6209a6 | 54 | barrier(); \ |
47933ad4 PZ |
55 | ___p1; \ |
56 | }) | |
57 | ||
10b663ae | 58 | #else |
47933ad4 | 59 | |
493e6874 WD |
60 | #define smp_mb() dmb(ish) |
61 | #define smp_rmb() dmb(ishld) | |
62 | #define smp_wmb() dmb(ishst) | |
47933ad4 PZ |
63 | |
64 | #define smp_store_release(p, v) \ | |
65 | do { \ | |
66 | compiletime_assert_atomic_type(*p); \ | |
67 | switch (sizeof(*p)) { \ | |
878a84d5 AP |
68 | case 1: \ |
69 | asm volatile ("stlrb %w1, %0" \ | |
70 | : "=Q" (*p) : "r" (v) : "memory"); \ | |
71 | break; \ | |
72 | case 2: \ | |
73 | asm volatile ("stlrh %w1, %0" \ | |
74 | : "=Q" (*p) : "r" (v) : "memory"); \ | |
75 | break; \ | |
47933ad4 PZ |
76 | case 4: \ |
77 | asm volatile ("stlr %w1, %0" \ | |
78 | : "=Q" (*p) : "r" (v) : "memory"); \ | |
79 | break; \ | |
80 | case 8: \ | |
81 | asm volatile ("stlr %1, %0" \ | |
82 | : "=Q" (*p) : "r" (v) : "memory"); \ | |
83 | break; \ | |
84 | } \ | |
85 | } while (0) | |
86 | ||
87 | #define smp_load_acquire(p) \ | |
88 | ({ \ | |
89 | typeof(*p) ___p1; \ | |
90 | compiletime_assert_atomic_type(*p); \ | |
91 | switch (sizeof(*p)) { \ | |
878a84d5 AP |
92 | case 1: \ |
93 | asm volatile ("ldarb %w0, %1" \ | |
94 | : "=r" (___p1) : "Q" (*p) : "memory"); \ | |
95 | break; \ | |
96 | case 2: \ | |
97 | asm volatile ("ldarh %w0, %1" \ | |
98 | : "=r" (___p1) : "Q" (*p) : "memory"); \ | |
99 | break; \ | |
47933ad4 PZ |
100 | case 4: \ |
101 | asm volatile ("ldar %w0, %1" \ | |
102 | : "=r" (___p1) : "Q" (*p) : "memory"); \ | |
103 | break; \ | |
104 | case 8: \ | |
105 | asm volatile ("ldar %0, %1" \ | |
106 | : "=r" (___p1) : "Q" (*p) : "memory"); \ | |
107 | break; \ | |
108 | } \ | |
109 | ___p1; \ | |
110 | }) | |
111 | ||
10b663ae CM |
112 | #endif |
113 | ||
114 | #define read_barrier_depends() do { } while(0) | |
115 | #define smp_read_barrier_depends() do { } while(0) | |
116 | ||
117 | #define set_mb(var, value) do { var = value; smp_mb(); } while (0) | |
118 | #define nop() asm volatile("nop"); | |
119 | ||
8715466b PZ |
120 | #define smp_mb__before_atomic() smp_mb() |
121 | #define smp_mb__after_atomic() smp_mb() | |
122 | ||
10b663ae CM |
123 | #endif /* __ASSEMBLY__ */ |
124 | ||
125 | #endif /* __ASM_BARRIER_H */ |