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 arch_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 arch_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/* 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 arch_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 arch_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 */