barrier.h

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#ifndef ZEPHYR_INCLUDE_ARCH_ARC_BARRIER_H_
#define ZEPHYR_INCLUDE_ARCH_ARC_BARRIER_H_
 
#ifndef ZEPHYR_INCLUDE_SYS_BARRIER_H_
#error Please include <zephyr/sys/barrier.h>
#endif
 
#ifndef __CCAC__
/* ARC GNU GCC lowers the barrier builtins correctly, so it keeps using
 * <zephyr/sys/barrier_builtin.h>. Only MWDT needs this backend.
 */
#error "The ARC barrier backend is a MWDT-only workaround"
#endif
 
#include <zephyr/toolchain.h>
#include <zephyr/arch/arc/dmb.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
/* MWDT implements __sync_synchronize() as a bare return and emits no dmb for
 * __atomic_thread_fence(), so emit the ARC barrier instructions directly.
 */
 
static ALWAYS_INLINE void z_barrier_sync_synchronize(void)
{
        __asm__ volatile("dmb " STRINGIFY(ARC_DMB_LOAD_STORE) ::: "memory");
}
 
static ALWAYS_INLINE void z_barrier_dmem_fence_full(void)
{
        __asm__ volatile("dmb " STRINGIFY(ARC_DMB_LOAD_STORE) ::: "memory");
}
 
static ALWAYS_INLINE void z_barrier_dsync_fence_full(void)
{
        /* dsync additionally stalls until the prior data accesses completed */
        __asm__ volatile("dsync" ::: "memory");
}
 
static ALWAYS_INLINE void z_barrier_isync_fence_full(void)
{
        /* sync is ARC's pipeline-affecting synchronization */
        __asm__ volatile("sync" ::: "memory");
}
 
#ifdef __cplusplus
}
#endif
 
#endif /* ZEPHYR_INCLUDE_ARCH_ARC_BARRIER_H_ */