[thirdparty/kernel/linux.git] / arch / microblaze / include / asm / cmpxchg.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_MICROBLAZE_CMPXCHG_H
#define _ASM_MICROBLAZE_CMPXCHG_H

#include <linux/irqflags.h>

void __bad_xchg(volatile void *ptr, int size);

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

	switch (size) {
	case 1:
		local_irq_save(flags);
		ret = *(volatile unsigned char *)ptr;
		*(volatile unsigned char *)ptr = x;
		local_irq_restore(flags);
		break;

	case 4:
		local_irq_save(flags);
		ret = *(volatile unsigned long *)ptr;
		*(volatile unsigned long *)ptr = x;
		local_irq_restore(flags);
		break;
	default:
		__bad_xchg(ptr, size), ret = 0;
		break;
	}

	return ret;
}

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

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

#endif /* _ASM_MICROBLAZE_CMPXCHG_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
c40d04df DH	2	#ifndef _ASM_MICROBLAZE_CMPXCHG_H
	3	#define _ASM_MICROBLAZE_CMPXCHG_H
	4
90c0d80d MS	5	#include <linux/irqflags.h>
90c0d80d MS	6
c40d04df DH	7	void __bad_xchg(volatile void *ptr, int size);
	8
	9	static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
	10	int size)
	11	{
	12	unsigned long ret;
	13	unsigned long flags;
	14
	15	switch (size) {
	16	case 1:
	17	local_irq_save(flags);
	18	ret = (volatile unsigned char )ptr;
	19	(volatile unsigned char )ptr = x;
	20	local_irq_restore(flags);
	21	break;
	22
	23	case 4:
	24	local_irq_save(flags);
	25	ret = (volatile unsigned long )ptr;
	26	(volatile unsigned long )ptr = x;
	27	local_irq_restore(flags);
	28	break;
	29	default:
	30	__bad_xchg(ptr, size), ret = 0;
	31	break;
	32	}
	33
	34	return ret;
	35	}
	36
	37	#define xchg(ptr, x) \
	38	((__typeof__((ptr))) __xchg((unsigned long)(x), (ptr), sizeof((ptr))))
	39
	40	#include <asm-generic/cmpxchg.h>
	41	#include <asm-generic/cmpxchg-local.h>
	42
	43	#endif /* _ASM_MICROBLAZE_CMPXCHG_H */