1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef __ASM_SH_CMPXCHG_H
 3#define __ASM_SH_CMPXCHG_H
 4
 5/*
 6 * Atomic operations that C can't guarantee us.  Useful for
 7 * resource counting etc..
 8 */
 9
10#include <linux/compiler.h>
11#include <linux/types.h>
12
13#if defined(CONFIG_GUSA_RB)
14#include <asm/cmpxchg-grb.h>
15#elif defined(CONFIG_CPU_SH4A)
16#include <asm/cmpxchg-llsc.h>
17#elif defined(CONFIG_CPU_J2) && defined(CONFIG_SMP)
18#include <asm/cmpxchg-cas.h>
19#else
20#include <asm/cmpxchg-irq.h>
21#endif
22
23extern void __xchg_called_with_bad_pointer(void);
24
25#define __xchg(ptr, x, size)				\
26({							\
27	unsigned long __xchg__res;			\
28	volatile void *__xchg_ptr = (ptr);		\
29	switch (size) {					\
30	case 4:						\
31		__xchg__res = xchg_u32(__xchg_ptr, x);	\
32		break;					\
33	case 2:						\
34		__xchg__res = xchg_u16(__xchg_ptr, x);	\
35		break;					\
36	case 1:						\
37		__xchg__res = xchg_u8(__xchg_ptr, x);	\
38		break;					\
39	default:					\
40		__xchg_called_with_bad_pointer();	\
41		__xchg__res = x;			\
42		break;					\
43	}						\
44							\
45	__xchg__res;					\
46})
47
48#define xchg(ptr,x)	\
49	((__typeof__(*(ptr)))__xchg((ptr),(unsigned long)(x), sizeof(*(ptr))))
50
51/* This function doesn't exist, so you'll get a linker error
52 * if something tries to do an invalid cmpxchg(). */
53extern void __cmpxchg_called_with_bad_pointer(void);
54
55static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
56		unsigned long new, int size)
57{
58	switch (size) {
59	case 4:
60		return __cmpxchg_u32(ptr, old, new);
61	}
62	__cmpxchg_called_with_bad_pointer();
63	return old;
64}
65
66#define cmpxchg(ptr,o,n)						 \
67  ({									 \
68     __typeof__(*(ptr)) _o_ = (o);					 \
69     __typeof__(*(ptr)) _n_ = (n);					 \
70     (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,		 \
71				    (unsigned long)_n_, sizeof(*(ptr))); \
72  })
73
74#endif /* __ASM_SH_CMPXCHG_H */

 
 1#ifndef __ASM_SH_CMPXCHG_H
 2#define __ASM_SH_CMPXCHG_H
 3
 4/*
 5 * Atomic operations that C can't guarantee us.  Useful for
 6 * resource counting etc..
 7 */
 8
 9#include <linux/compiler.h>
10#include <linux/types.h>
11
12#if defined(CONFIG_GUSA_RB)
13#include <asm/cmpxchg-grb.h>
14#elif defined(CONFIG_CPU_SH4A)
15#include <asm/cmpxchg-llsc.h>
16#elif defined(CONFIG_CPU_J2) && defined(CONFIG_SMP)
17#include <asm/cmpxchg-cas.h>
18#else
19#include <asm/cmpxchg-irq.h>
20#endif
21
22extern void __xchg_called_with_bad_pointer(void);
23
24#define __xchg(ptr, x, size)				\
25({							\
26	unsigned long __xchg__res;			\
27	volatile void *__xchg_ptr = (ptr);		\
28	switch (size) {					\
29	case 4:						\
30		__xchg__res = xchg_u32(__xchg_ptr, x);	\
31		break;					\
32	case 2:						\
33		__xchg__res = xchg_u16(__xchg_ptr, x);	\
34		break;					\
35	case 1:						\
36		__xchg__res = xchg_u8(__xchg_ptr, x);	\
37		break;					\
38	default:					\
39		__xchg_called_with_bad_pointer();	\
40		__xchg__res = x;			\
41		break;					\
42	}						\
43							\
44	__xchg__res;					\
45})
46
47#define xchg(ptr,x)	\
48	((__typeof__(*(ptr)))__xchg((ptr),(unsigned long)(x), sizeof(*(ptr))))
49
50/* This function doesn't exist, so you'll get a linker error
51 * if something tries to do an invalid cmpxchg(). */
52extern void __cmpxchg_called_with_bad_pointer(void);
53
54static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
55		unsigned long new, int size)
56{
57	switch (size) {
58	case 4:
59		return __cmpxchg_u32(ptr, old, new);
60	}
61	__cmpxchg_called_with_bad_pointer();
62	return old;
63}
64
65#define cmpxchg(ptr,o,n)						 \
66  ({									 \
67     __typeof__(*(ptr)) _o_ = (o);					 \
68     __typeof__(*(ptr)) _n_ = (n);					 \
69     (__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,		 \
70				    (unsigned long)_n_, sizeof(*(ptr))); \
71  })
72
73#endif /* __ASM_SH_CMPXCHG_H */