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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/sh/include/asm/cmpxchg-llsc.h
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/* SPDX-License-Identifier: GPL-2.0 */

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#ifndef __ASM_SH_CMPXCHG_LLSC_H

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#define __ASM_SH_CMPXCHG_LLSC_H

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static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)

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{

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	unsigned long retval;

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	unsigned long tmp;

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	__asm__ __volatile__ (

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		"1:					\n\t"

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		"movli.l	@%2, %0	! xchg_u32	\n\t"

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		"mov		%0, %1			\n\t"

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		"mov		%3, %0			\n\t"

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		"movco.l	%0, @%2			\n\t"

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		"bf		1b			\n\t"

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		"synco					\n\t"

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		: "=&z"(tmp), "=&r" (retval)

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		: "r" (m), "r" (val)

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		: "t", "memory"

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	);

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	return retval;

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}

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static inline unsigned long

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__cmpxchg_u32(volatile u32 *m, unsigned long old, unsigned long new)

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{

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	unsigned long retval;

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	unsigned long tmp;

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	__asm__ __volatile__ (

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		"1:						\n\t"

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		"movli.l	@%2, %0	! __cmpxchg_u32		\n\t"

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		"mov		%0, %1				\n\t"

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		"cmp/eq		%1, %3				\n\t"

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		"bf		2f				\n\t"

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		"mov		%4, %0				\n\t"

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		"2:						\n\t"

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		"movco.l	%0, @%2				\n\t"

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		"bf		1b				\n\t"

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		"synco						\n\t"

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		: "=&z" (tmp), "=&r" (retval)

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		: "r" (m), "r" (old), "r" (new)

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		: "t", "memory"

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	);

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	return retval;

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}

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#include <asm/cmpxchg-xchg.h>

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#endif /* __ASM_SH_CMPXCHG_LLSC_H */

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