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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_BARRIER_H
#define __ASM_BARRIER_H
#include <asm/alternative.h>
#ifndef __ASSEMBLY__
/* The synchronize caches instruction executes as a nop on systems in
which all memory references are performed in order. */
#define synchronize_caches() asm volatile("sync" \
ALTERNATIVE(ALT_COND_NO_SMP, INSN_NOP) \
: : : "memory")
#if defined(CONFIG_SMP)
#define mb() do { synchronize_caches(); } while (0)
#define rmb() mb()
#define wmb() mb()
#define dma_rmb() mb()
#define dma_wmb() mb()
#else
#define mb() barrier()
#define rmb() barrier()
#define wmb() barrier()
#define dma_rmb() barrier()
#define dma_wmb() barrier()
#endif
#define __smp_mb() mb()
#define __smp_rmb() mb()
#define __smp_wmb() mb()
#define __smp_store_release(p, v) \
do { \
typeof(p) __p = (p); \
union { typeof(*p) __val; char __c[1]; } __u = \
{ .__val = (__force typeof(*p)) (v) }; \
compiletime_assert_atomic_type(*p); \
switch (sizeof(*p)) { \
case 1: \
asm volatile("stb,ma %0,0(%1)" \
: : "r"(*(__u8 *)__u.__c), "r"(__p) \
: "memory"); \
break; \
case 2: \
asm volatile("sth,ma %0,0(%1)" \
: : "r"(*(__u16 *)__u.__c), "r"(__p) \
: "memory"); \
break; \
case 4: \
asm volatile("stw,ma %0,0(%1)" \
: : "r"(*(__u32 *)__u.__c), "r"(__p) \
: "memory"); \
break; \
case 8: \
if (IS_ENABLED(CONFIG_64BIT)) \
asm volatile("std,ma %0,0(%1)" \
: : "r"(*(__u64 *)__u.__c), "r"(__p) \
: "memory"); \
break; \
} \
} while (0)
#define __smp_load_acquire(p) \
({ \
union { typeof(*p) __val; char __c[1]; } __u; \
typeof(p) __p = (p); \
compiletime_assert_atomic_type(*p); \
switch (sizeof(*p)) { \
case 1: \
asm volatile("ldb,ma 0(%1),%0" \
: "=r"(*(__u8 *)__u.__c) : "r"(__p) \
: "memory"); \
break; \
case 2: \
asm volatile("ldh,ma 0(%1),%0" \
: "=r"(*(__u16 *)__u.__c) : "r"(__p) \
: "memory"); \
break; \
case 4: \
asm volatile("ldw,ma 0(%1),%0" \
: "=r"(*(__u32 *)__u.__c) : "r"(__p) \
: "memory"); \
break; \
case 8: \
if (IS_ENABLED(CONFIG_64BIT)) \
asm volatile("ldd,ma 0(%1),%0" \
: "=r"(*(__u64 *)__u.__c) : "r"(__p) \
: "memory"); \
break; \
} \
__u.__val; \
})
#include <asm-generic/barrier.h>
#endif /* !__ASSEMBLY__ */
#endif /* __ASM_BARRIER_H */