GNU Linux-libre 4.19.304-gnu1
[releases.git] / arch / h8300 / include / asm / cmpxchg.h
1 /* SPDX-License-Identifier: GPL-2.0 */
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__ */