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Linux kernel mirror (for testing)
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linux
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_MICROBLAZE_CMPXCHG_H
3#define _ASM_MICROBLAZE_CMPXCHG_H
4
5#include <linux/irqflags.h>
6
7void __bad_xchg(volatile void *ptr, int size);
8
9static 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 */