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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 | ||
f99a250c WD |
23 | #define __nops(n) ".rept " #n "\nnop\n.endr\n" |
24 | #define nops(n) asm volatile(__nops(n)) | |
25 | ||
10b663ae CM |
26 | #define sev() asm volatile("sev" : : : "memory") |
27 | #define wfe() asm volatile("wfe" : : : "memory") | |
28 | #define wfi() asm volatile("wfi" : : : "memory") | |
29 | ||
30 | #define isb() asm volatile("isb" : : : "memory") | |
493e6874 WD |
31 | #define dmb(opt) asm volatile("dmb " #opt : : : "memory") |
32 | #define dsb(opt) asm volatile("dsb " #opt : : : "memory") | |
10b663ae | 33 | |
98f7685e | 34 | #define mb() dsb(sy) |
493e6874 WD |
35 | #define rmb() dsb(ld) |
36 | #define wmb() dsb(st) | |
10b663ae | 37 | |
1077fa36 AD |
38 | #define dma_rmb() dmb(oshld) |
39 | #define dma_wmb() dmb(oshst) | |
40 | ||
fd072df8 MT |
41 | #define __smp_mb() dmb(ish) |
42 | #define __smp_rmb() dmb(ishld) | |
43 | #define __smp_wmb() dmb(ishst) | |
47933ad4 | 44 | |
fd072df8 | 45 | #define __smp_store_release(p, v) \ |
47933ad4 PZ |
46 | do { \ |
47 | compiletime_assert_atomic_type(*p); \ | |
48 | switch (sizeof(*p)) { \ | |
878a84d5 AP |
49 | case 1: \ |
50 | asm volatile ("stlrb %w1, %0" \ | |
51 | : "=Q" (*p) : "r" (v) : "memory"); \ | |
52 | break; \ | |
53 | case 2: \ | |
54 | asm volatile ("stlrh %w1, %0" \ | |
55 | : "=Q" (*p) : "r" (v) : "memory"); \ | |
56 | break; \ | |
47933ad4 PZ |
57 | case 4: \ |
58 | asm volatile ("stlr %w1, %0" \ | |
59 | : "=Q" (*p) : "r" (v) : "memory"); \ | |
60 | break; \ | |
61 | case 8: \ | |
62 | asm volatile ("stlr %1, %0" \ | |
63 | : "=Q" (*p) : "r" (v) : "memory"); \ | |
64 | break; \ | |
65 | } \ | |
66 | } while (0) | |
67 | ||
fd072df8 | 68 | #define __smp_load_acquire(p) \ |
47933ad4 | 69 | ({ \ |
c139aa60 | 70 | union { typeof(*p) __val; char __c[1]; } __u; \ |
47933ad4 PZ |
71 | compiletime_assert_atomic_type(*p); \ |
72 | switch (sizeof(*p)) { \ | |
878a84d5 AP |
73 | case 1: \ |
74 | asm volatile ("ldarb %w0, %1" \ | |
c139aa60 WD |
75 | : "=r" (*(__u8 *)__u.__c) \ |
76 | : "Q" (*p) : "memory"); \ | |
878a84d5 AP |
77 | break; \ |
78 | case 2: \ | |
79 | asm volatile ("ldarh %w0, %1" \ | |
c139aa60 WD |
80 | : "=r" (*(__u16 *)__u.__c) \ |
81 | : "Q" (*p) : "memory"); \ | |
878a84d5 | 82 | break; \ |
47933ad4 PZ |
83 | case 4: \ |
84 | asm volatile ("ldar %w0, %1" \ | |
c139aa60 WD |
85 | : "=r" (*(__u32 *)__u.__c) \ |
86 | : "Q" (*p) : "memory"); \ | |
47933ad4 PZ |
87 | break; \ |
88 | case 8: \ | |
89 | asm volatile ("ldar %0, %1" \ | |
c139aa60 WD |
90 | : "=r" (*(__u64 *)__u.__c) \ |
91 | : "Q" (*p) : "memory"); \ | |
47933ad4 PZ |
92 | break; \ |
93 | } \ | |
c139aa60 | 94 | __u.__val; \ |
47933ad4 PZ |
95 | }) |
96 | ||
03e3c2b7 WD |
97 | #define smp_cond_load_acquire(ptr, cond_expr) \ |
98 | ({ \ | |
99 | typeof(ptr) __PTR = (ptr); \ | |
100 | typeof(*ptr) VAL; \ | |
101 | for (;;) { \ | |
102 | VAL = smp_load_acquire(__PTR); \ | |
103 | if (cond_expr) \ | |
104 | break; \ | |
105 | __cmpwait_relaxed(__PTR, VAL); \ | |
106 | } \ | |
107 | VAL; \ | |
108 | }) | |
109 | ||
90ff6a17 | 110 | #include <asm-generic/barrier.h> |
8715466b | 111 | |
10b663ae CM |
112 | #endif /* __ASSEMBLY__ */ |
113 | ||
114 | #endif /* __ASM_BARRIER_H */ |