Release 4.18 arch/powerpc/include/asm/synch.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_POWERPC_SYNCH_H 

#define _ASM_POWERPC_SYNCH_H 
#ifdef __KERNEL__

#include <linux/stringify.h>
#include <asm/feature-fixups.h>

#ifndef __ASSEMBLY__
extern unsigned int __start___lwsync_fixup, __stop___lwsync_fixup;
extern void do_lwsync_fixups(unsigned long value, void *fixup_start,
			     void *fixup_end);



static inline void eieio(void)
{
	__asm__ __volatile__ ("eieio" : : : "memory");
}

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static inline void isync(void)
{
	__asm__ __volatile__ ("isync" : : : "memory");
}
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#endif /* __ASSEMBLY__ */

#if defined(__powerpc64__)

#    define LWSYNC	lwsync
#elif defined(CONFIG_E500)

#    define LWSYNC					\
	START_LWSYNC_SECTION(96);                       \
        sync;                                           \
        MAKE_LWSYNC_SECTION_ENTRY(96, __lwsync_fixup);
#else

#    define LWSYNC	sync
#endif

#ifdef CONFIG_SMP

#define __PPC_ACQUIRE_BARRIER				\
	START_LWSYNC_SECTION(97);                       \
        isync;                                          \
        MAKE_LWSYNC_SECTION_ENTRY(97, __lwsync_fixup);

#define PPC_ACQUIRE_BARRIER	 "\n" stringify_in_c(__PPC_ACQUIRE_BARRIER)

#define PPC_RELEASE_BARRIER	 stringify_in_c(LWSYNC) "\n"

#define PPC_ATOMIC_ENTRY_BARRIER "\n" stringify_in_c(sync) "\n"

#define PPC_ATOMIC_EXIT_BARRIER	 "\n" stringify_in_c(sync) "\n"
#else

#define PPC_ACQUIRE_BARRIER

#define PPC_RELEASE_BARRIER

#define PPC_ATOMIC_ENTRY_BARRIER

#define PPC_ATOMIC_EXIT_BARRIER
#endif

#endif /* __KERNEL__ */
#endif	/* _ASM_POWERPC_SYNCH_H */
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Directory: arch/powerpc/include/asm

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