barrier.h

Go to the documentation of this file.

/*
 * Copyright (c) 2023 Carlo Caione <ccaione@baylibre.com>
 *
 * SPDX-License-Identifier: Apache-2.0
 */

 
#ifndef ZEPHYR_INCLUDE_SYS_BARRIER_H_
#define ZEPHYR_INCLUDE_SYS_BARRIER_H_
 
#include <zephyr/toolchain.h>
 
#if defined(CONFIG_BARRIER_OPERATIONS_ARCH)
# if defined(CONFIG_ARM)
# include <zephyr/arch/arm/barrier.h>
# elif defined(CONFIG_ARM64)
# include <zephyr/arch/arm64/barrier.h>
# elif defined(CONFIG_ARC)
# include <zephyr/arch/arc/barrier.h>
# endif
#elif defined(CONFIG_BARRIER_OPERATIONS_BUILTIN)
#include <zephyr/sys/barrier_builtin.h>
#else
/* No backend is available for this architecture and toolchain combination, so
 * fall back to a compiler barrier. That keeps the compiler from moving
 * accesses across the barrier, but it emits no instruction, so nothing
 * constrains the hardware. Architectures where the ordering matters must
 * select BARRIER_OPERATIONS_BUILTIN or BARRIER_OPERATIONS_ARCH; the barrier
 * API must never expand to nothing at all.
 */
 
static ALWAYS_INLINE void z_barrier_sync_synchronize(void)
{
        compiler_barrier();
}
 
static ALWAYS_INLINE void z_barrier_dmem_fence_full(void)
{
        compiler_barrier();
}
 
static ALWAYS_INLINE void z_barrier_dsync_fence_full(void)
{
        compiler_barrier();
}
 
static ALWAYS_INLINE void z_barrier_isync_fence_full(void)
{
        compiler_barrier();
}
#endif
 
#ifdef __cplusplus
extern "C" {
#endif


static ALWAYS_INLINE void barrier_sync_synchronize(void)
{
        z_barrier_sync_synchronize();
}

static ALWAYS_INLINE void barrier_dmem_fence_full(void)
{
        z_barrier_dmem_fence_full();
}

static ALWAYS_INLINE void barrier_dsync_fence_full(void)
{
        z_barrier_dsync_fence_full();
}

static ALWAYS_INLINE void barrier_isync_fence_full(void)
{
        z_barrier_isync_fence_full();
}

 
#ifdef __cplusplus
} /* extern "C" */
#endif
 
#endif /* ZEPHYR_INCLUDE_SYS_ATOMIC_H_ */