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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
d2a5f499 YS |
2 | #ifndef __ARCH_H8300_CMPXCHG__ |
3 | #define __ARCH_H8300_CMPXCHG__ | |
4 | ||
5 | #include <linux/irqflags.h> | |
6 | ||
7 | #define xchg(ptr, x) \ | |
8 | ((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), \ | |
9 | sizeof(*(ptr)))) | |
10 | ||
11 | struct __xchg_dummy { unsigned long a[100]; }; | |
12 | #define __xg(x) ((volatile struct __xchg_dummy *)(x)) | |
13 | ||
14 | static inline unsigned long __xchg(unsigned long x, | |
15 | volatile void *ptr, int size) | |
16 | { | |
17 | unsigned long tmp, flags; | |
18 | ||
19 | local_irq_save(flags); | |
20 | ||
21 | switch (size) { | |
22 | case 1: | |
23 | __asm__ __volatile__ | |
24 | ("mov.b %2,%0\n\t" | |
25 | "mov.b %1,%2" | |
26 | : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr))); | |
27 | break; | |
28 | case 2: | |
29 | __asm__ __volatile__ | |
30 | ("mov.w %2,%0\n\t" | |
31 | "mov.w %1,%2" | |
32 | : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr))); | |
33 | break; | |
34 | case 4: | |
35 | __asm__ __volatile__ | |
36 | ("mov.l %2,%0\n\t" | |
37 | "mov.l %1,%2" | |
38 | : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr))); | |
39 | break; | |
40 | default: | |
41 | tmp = 0; | |
42 | } | |
43 | local_irq_restore(flags); | |
44 | return tmp; | |
45 | } | |
46 | ||
47 | #include <asm-generic/cmpxchg-local.h> | |
48 | ||
49 | /* | |
50 | * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make | |
51 | * them available. | |
52 | */ | |
53 | #define cmpxchg_local(ptr, o, n) \ | |
54 | ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), \ | |
55 | (unsigned long)(o), \ | |
56 | (unsigned long)(n), \ | |
57 | sizeof(*(ptr)))) | |
58 | #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n)) | |
59 | ||
60 | #ifndef CONFIG_SMP | |
61 | #include <asm-generic/cmpxchg.h> | |
62 | #endif | |
63 | ||
64 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) | |
65 | ||
66 | #endif /* __ARCH_H8300_CMPXCHG__ */ |