1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 */
2*4882a593Smuzhiyun #ifndef __ARCH_H8300_CMPXCHG__
3*4882a593Smuzhiyun #define __ARCH_H8300_CMPXCHG__
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun #include <linux/irqflags.h>
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #define xchg(ptr, x) \
8*4882a593Smuzhiyun ((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), \
9*4882a593Smuzhiyun sizeof(*(ptr))))
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun struct __xchg_dummy { unsigned long a[100]; };
12*4882a593Smuzhiyun #define __xg(x) ((volatile struct __xchg_dummy *)(x))
13*4882a593Smuzhiyun
__xchg(unsigned long x,volatile void * ptr,int size)14*4882a593Smuzhiyun static inline unsigned long __xchg(unsigned long x,
15*4882a593Smuzhiyun volatile void *ptr, int size)
16*4882a593Smuzhiyun {
17*4882a593Smuzhiyun unsigned long tmp, flags;
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun local_irq_save(flags);
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun switch (size) {
22*4882a593Smuzhiyun case 1:
23*4882a593Smuzhiyun __asm__ __volatile__
24*4882a593Smuzhiyun ("mov.b %2,%0\n\t"
25*4882a593Smuzhiyun "mov.b %1,%2"
26*4882a593Smuzhiyun : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)));
27*4882a593Smuzhiyun break;
28*4882a593Smuzhiyun case 2:
29*4882a593Smuzhiyun __asm__ __volatile__
30*4882a593Smuzhiyun ("mov.w %2,%0\n\t"
31*4882a593Smuzhiyun "mov.w %1,%2"
32*4882a593Smuzhiyun : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)));
33*4882a593Smuzhiyun break;
34*4882a593Smuzhiyun case 4:
35*4882a593Smuzhiyun __asm__ __volatile__
36*4882a593Smuzhiyun ("mov.l %2,%0\n\t"
37*4882a593Smuzhiyun "mov.l %1,%2"
38*4882a593Smuzhiyun : "=&r" (tmp) : "r" (x), "m" (*__xg(ptr)));
39*4882a593Smuzhiyun break;
40*4882a593Smuzhiyun default:
41*4882a593Smuzhiyun tmp = 0;
42*4882a593Smuzhiyun }
43*4882a593Smuzhiyun local_irq_restore(flags);
44*4882a593Smuzhiyun return tmp;
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun #include <asm-generic/cmpxchg-local.h>
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun /*
50*4882a593Smuzhiyun * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
51*4882a593Smuzhiyun * them available.
52*4882a593Smuzhiyun */
53*4882a593Smuzhiyun #define cmpxchg_local(ptr, o, n) \
54*4882a593Smuzhiyun ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), \
55*4882a593Smuzhiyun (unsigned long)(o), \
56*4882a593Smuzhiyun (unsigned long)(n), \
57*4882a593Smuzhiyun sizeof(*(ptr))))
58*4882a593Smuzhiyun #define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun #ifndef CONFIG_SMP
61*4882a593Smuzhiyun #include <asm-generic/cmpxchg.h>
62*4882a593Smuzhiyun #endif
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun #endif /* __ARCH_H8300_CMPXCHG__ */
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