[mirror_ubuntu-jammy-kernel.git] / arch / unicore32 / include / asm / cmpxchg.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Atomics xchg/cmpxchg for PKUnity SoC and UniCore ISA
 *
 * Copyright (C) 2001-2012 GUAN Xue-tao
 */
#ifndef __UNICORE_CMPXCHG_H__
#define __UNICORE_CMPXCHG_H__

/*
 * Generate a link failure on undefined symbol if the pointer points to a value
 * of unsupported size.
 */
extern void __xchg_bad_pointer(void);

static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
		int size)
{
	unsigned long ret;

	switch (size) {
	case 1:
		asm volatile("swapb	%0, %1, [%2]"
			: "=&r" (ret)
			: "r" (x), "r" (ptr)
			: "memory", "cc");
		break;
	case 4:
		asm volatile("swapw	%0, %1, [%2]"
			: "=&r" (ret)
			: "r" (x), "r" (ptr)
			: "memory", "cc");
		break;
	default:
		__xchg_bad_pointer();
	}

	return ret;
}

#define xchg(ptr, x) \
	((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))

#include <asm-generic/cmpxchg-local.h>

/*
 * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
 * them available.
 */
#define cmpxchg_local(ptr, o, n)					\
		((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr),	\
		(unsigned long)(o), (unsigned long)(n), sizeof(*(ptr))))
#define cmpxchg64_local(ptr, o, n)					\
		__cmpxchg64_local_generic((ptr), (o), (n))

#include <asm-generic/cmpxchg.h>

#endif /* __UNICORE_CMPXCHG_H__ */
Commit	Line	Data
d2912cb1	1	/* SPDX-License-Identifier: GPL-2.0-only */
8978bfd2 GX	2	/*
	3	* Atomics xchg/cmpxchg for PKUnity SoC and UniCore ISA
	4	*
	5	* Copyright (C) 2001-2012 GUAN Xue-tao
8978bfd2 GX	6	*/
	7	#ifndef __UNICORE_CMPXCHG_H__
	8	#define __UNICORE_CMPXCHG_H__
	9
	10	/*
	11	* Generate a link failure on undefined symbol if the pointer points to a value
	12	* of unsupported size.
	13	*/
	14	extern void __xchg_bad_pointer(void);
	15
	16	static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
	17	int size)
	18	{
	19	unsigned long ret;
	20
	21	switch (size) {
	22	case 1:
	23	asm volatile("swapb %0, %1, [%2]"
	24	: "=&r" (ret)
	25	: "r" (x), "r" (ptr)
	26	: "memory", "cc");
	27	break;
	28	case 4:
	29	asm volatile("swapw %0, %1, [%2]"
	30	: "=&r" (ret)
	31	: "r" (x), "r" (ptr)
	32	: "memory", "cc");
	33	break;
	34	default:
195d4577	35	__xchg_bad_pointer();
8978bfd2 GX	36	}
	37
	38	return ret;
	39	}
	40
	41	#define xchg(ptr, x) \
	42	((__typeof__((ptr)))__xchg((unsigned long)(x), (ptr), sizeof((ptr))))
	43
	44	#include <asm-generic/cmpxchg-local.h>
	45
	46	/*
	47	* cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
	48	* them available.
	49	*/
	50	#define cmpxchg_local(ptr, o, n) \
	51	((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), \
	52	(unsigned long)(o), (unsigned long)(n), sizeof(*(ptr))))
	53	#define cmpxchg64_local(ptr, o, n) \
	54	__cmpxchg64_local_generic((ptr), (o), (n))
	55
	56	#include <asm-generic/cmpxchg.h>
	57
	58	#endif /* __UNICORE_CMPXCHG_H__ */