1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */
2e839ca52SDavid Howells #ifndef __ASM_SH_CMPXCHG_H
3e839ca52SDavid Howells #define __ASM_SH_CMPXCHG_H
4e839ca52SDavid Howells
5e839ca52SDavid Howells /*
6e839ca52SDavid Howells * Atomic operations that C can't guarantee us. Useful for
7e839ca52SDavid Howells * resource counting etc..
8e839ca52SDavid Howells */
9e839ca52SDavid Howells
10e839ca52SDavid Howells #include <linux/compiler.h>
11e839ca52SDavid Howells #include <linux/types.h>
12*c81a748eSPaul E. McKenney #include <linux/cmpxchg-emu.h>
13e839ca52SDavid Howells
14e839ca52SDavid Howells #if defined(CONFIG_GUSA_RB)
15e839ca52SDavid Howells #include <asm/cmpxchg-grb.h>
16e839ca52SDavid Howells #elif defined(CONFIG_CPU_SH4A)
17e839ca52SDavid Howells #include <asm/cmpxchg-llsc.h>
182b47d54eSRich Felker #elif defined(CONFIG_CPU_J2) && defined(CONFIG_SMP)
192b47d54eSRich Felker #include <asm/cmpxchg-cas.h>
20e839ca52SDavid Howells #else
21e839ca52SDavid Howells #include <asm/cmpxchg-irq.h>
22e839ca52SDavid Howells #endif
23e839ca52SDavid Howells
24e839ca52SDavid Howells extern void __xchg_called_with_bad_pointer(void);
25e839ca52SDavid Howells
2606855063SAndrzej Hajda #define __arch_xchg(ptr, x, size) \
27e839ca52SDavid Howells ({ \
28e839ca52SDavid Howells unsigned long __xchg__res; \
29e839ca52SDavid Howells volatile void *__xchg_ptr = (ptr); \
30e839ca52SDavid Howells switch (size) { \
31e839ca52SDavid Howells case 4: \
32e839ca52SDavid Howells __xchg__res = xchg_u32(__xchg_ptr, x); \
33e839ca52SDavid Howells break; \
343226aad8SMichael S. Tsirkin case 2: \
353226aad8SMichael S. Tsirkin __xchg__res = xchg_u16(__xchg_ptr, x); \
363226aad8SMichael S. Tsirkin break; \
37e839ca52SDavid Howells case 1: \
38e839ca52SDavid Howells __xchg__res = xchg_u8(__xchg_ptr, x); \
39e839ca52SDavid Howells break; \
40e839ca52SDavid Howells default: \
41e839ca52SDavid Howells __xchg_called_with_bad_pointer(); \
42e839ca52SDavid Howells __xchg__res = x; \
43e839ca52SDavid Howells break; \
44e839ca52SDavid Howells } \
45e839ca52SDavid Howells \
46e839ca52SDavid Howells __xchg__res; \
47e839ca52SDavid Howells })
48e839ca52SDavid Howells
498c641755SMark Rutland #define arch_xchg(ptr,x) \
5006855063SAndrzej Hajda ((__typeof__(*(ptr)))__arch_xchg((ptr),(unsigned long)(x), sizeof(*(ptr))))
51e839ca52SDavid Howells
52e839ca52SDavid Howells /* This function doesn't exist, so you'll get a linker error
53e839ca52SDavid Howells * if something tries to do an invalid cmpxchg(). */
54e839ca52SDavid Howells extern void __cmpxchg_called_with_bad_pointer(void);
55e839ca52SDavid Howells
__cmpxchg(volatile void * ptr,unsigned long old,unsigned long new,int size)56e839ca52SDavid Howells static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
57e839ca52SDavid Howells unsigned long new, int size)
58e839ca52SDavid Howells {
59e839ca52SDavid Howells switch (size) {
60*c81a748eSPaul E. McKenney case 1:
61*c81a748eSPaul E. McKenney return cmpxchg_emu_u8(ptr, old, new);
62e839ca52SDavid Howells case 4:
63e839ca52SDavid Howells return __cmpxchg_u32(ptr, old, new);
64e839ca52SDavid Howells }
65e839ca52SDavid Howells __cmpxchg_called_with_bad_pointer();
66e839ca52SDavid Howells return old;
67e839ca52SDavid Howells }
68e839ca52SDavid Howells
698c641755SMark Rutland #define arch_cmpxchg(ptr,o,n) \
70e839ca52SDavid Howells ({ \
71e839ca52SDavid Howells __typeof__(*(ptr)) _o_ = (o); \
72e839ca52SDavid Howells __typeof__(*(ptr)) _n_ = (n); \
73e839ca52SDavid Howells (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
74e839ca52SDavid Howells (unsigned long)_n_, sizeof(*(ptr))); \
75e839ca52SDavid Howells })
76e839ca52SDavid Howells
7763f1ee20SMasami Hiramatsu #include <asm-generic/cmpxchg-local.h>
7863f1ee20SMasami Hiramatsu
7963f1ee20SMasami Hiramatsu #define arch_cmpxchg_local(ptr, o, n) ({ \
8063f1ee20SMasami Hiramatsu (__typeof__(*ptr))__generic_cmpxchg_local((ptr), \
8163f1ee20SMasami Hiramatsu (unsigned long)(o), \
8263f1ee20SMasami Hiramatsu (unsigned long)(n), \
8363f1ee20SMasami Hiramatsu sizeof(*(ptr))); \
8463f1ee20SMasami Hiramatsu })
8563f1ee20SMasami Hiramatsu
86e839ca52SDavid Howells #endif /* __ASM_SH_CMPXCHG_H */
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