2 * Based on arch/arm/include/asm/barrier.h
4 * Copyright (C) 2012 ARM Ltd.
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.
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.
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/>.
18 #ifndef __ASM_BARRIER_H
19 #define __ASM_BARRIER_H
23 #define __nops(n) ".rept " #n "\nnop\n.endr\n"
24 #define nops(n) asm volatile(__nops(n))
26 #define sev() asm volatile("sev" : : : "memory")
27 #define wfe() asm volatile("wfe" : : : "memory")
28 #define wfi() asm volatile("wfi" : : : "memory")
30 #define isb() asm volatile("isb" : : : "memory")
31 #define dmb(opt) asm volatile("dmb " #opt : : : "memory")
32 #define dsb(opt) asm volatile("dsb " #opt : : : "memory")
34 #define psb_csync() asm volatile("hint #17" : : : "memory")
40 #define dma_rmb() dmb(oshld)
41 #define dma_wmb() dmb(oshst)
43 #define __smp_mb() dmb(ish)
44 #define __smp_rmb() dmb(ishld)
45 #define __smp_wmb() dmb(ishst)
47 #define __smp_store_release(p, v) \
49 union { typeof(*p) __val; char __c[1]; } __u = \
50 { .__val = (__force typeof(*p)) (v) }; \
51 compiletime_assert_atomic_type(*p); \
52 switch (sizeof(*p)) { \
54 asm volatile ("stlrb %w1, %0" \
56 : "r" (*(__u8 *)__u.__c) \
60 asm volatile ("stlrh %w1, %0" \
62 : "r" (*(__u16 *)__u.__c) \
66 asm volatile ("stlr %w1, %0" \
68 : "r" (*(__u32 *)__u.__c) \
72 asm volatile ("stlr %1, %0" \
74 : "r" (*(__u64 *)__u.__c) \
80 #define __smp_load_acquire(p) \
82 union { typeof(*p) __val; char __c[1]; } __u; \
83 compiletime_assert_atomic_type(*p); \
84 switch (sizeof(*p)) { \
86 asm volatile ("ldarb %w0, %1" \
87 : "=r" (*(__u8 *)__u.__c) \
88 : "Q" (*p) : "memory"); \
91 asm volatile ("ldarh %w0, %1" \
92 : "=r" (*(__u16 *)__u.__c) \
93 : "Q" (*p) : "memory"); \
96 asm volatile ("ldar %w0, %1" \
97 : "=r" (*(__u32 *)__u.__c) \
98 : "Q" (*p) : "memory"); \
101 asm volatile ("ldar %0, %1" \
102 : "=r" (*(__u64 *)__u.__c) \
103 : "Q" (*p) : "memory"); \
109 #define smp_cond_load_acquire(ptr, cond_expr) \
111 typeof(ptr) __PTR = (ptr); \
114 VAL = smp_load_acquire(__PTR); \
117 __cmpwait_relaxed(__PTR, VAL); \
122 #include <asm-generic/barrier.h>
124 #endif /* __ASSEMBLY__ */
126 #endif /* __ASM_BARRIER_H */