1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ASM_SH_CMPXCHG_IRQ_H
3 #define __ASM_SH_CMPXCHG_IRQ_H
4
5 #include <linux/irqflags.h>
6
7 static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
8 {
9 unsigned long flags, retval;
10
11 local_irq_save(flags);
12 retval = *m;
13 *m = val;
14 local_irq_restore(flags);
15 return retval;
16 }
17
18 static inline unsigned long xchg_u16(volatile u16 *m, unsigned long val)
19 {
20 unsigned long flags, retval;
21
22 local_irq_save(flags);
23 retval = *m;
24 *m = val;
25 local_irq_restore(flags);
26 return retval;
27 }
28
29 static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
30 {
31 unsigned long flags, retval;
32
33 local_irq_save(flags);
34 retval = *m;
35 *m = val & 0xff;
36 local_irq_restore(flags);
37 return retval;
38 }
39
40 static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
41 unsigned long new)
42 {
43 __u32 retval;
44 unsigned long flags;
45
46 local_irq_save(flags);
47 retval = *m;
48 if (retval == old)
49 *m = new;
50 local_irq_restore(flags); /* implies memory barrier */
51 return retval;
52 }
53
54 #endif /* __ASM_SH_CMPXCHG_IRQ_H */
55
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