[GitHub/moto-9609/android_kernel_motorola_exynos9610.git] / arch / parisc / include / asm / cmpxchg.h

/*
 * forked from parisc asm/atomic.h which was:
 *	Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
 *	Copyright (C) 2006 Kyle McMartin <kyle@parisc-linux.org>
 */

#ifndef _ASM_PARISC_CMPXCHG_H_
#define _ASM_PARISC_CMPXCHG_H_

/* This should get optimized out since it's never called.
** Or get a link error if xchg is used "wrong".
*/
extern void __xchg_called_with_bad_pointer(void);

/* __xchg32/64 defined in arch/parisc/lib/bitops.c */
extern unsigned long __xchg8(char, char *);
extern unsigned long __xchg32(int, int *);
#ifdef CONFIG_64BIT
extern unsigned long __xchg64(unsigned long, unsigned long *);
#endif

/* optimizer better get rid of switch since size is a constant */
static inline unsigned long
__xchg(unsigned long x, __volatile__ void *ptr, int size)
{
	switch (size) {
#ifdef CONFIG_64BIT
	case 8: return __xchg64(x, (unsigned long *) ptr);
#endif
	case 4: return __xchg32((int) x, (int *) ptr);
	case 1: return __xchg8((char) x, (char *) ptr);
	}
	__xchg_called_with_bad_pointer();
	return x;
}

/*
** REVISIT - Abandoned use of LDCW in xchg() for now:
** o need to test sizeof(*ptr) to avoid clearing adjacent bytes
** o and while we are at it, could CONFIG_64BIT code use LDCD too?
**
**	if (__builtin_constant_p(x) && (x == NULL))
**		if (((unsigned long)p & 0xf) == 0)
**			return __ldcw(p);
*/
#define xchg(ptr, x) \
	((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))

/* bug catcher for when unsupported size is used - won't link */
extern void __cmpxchg_called_with_bad_pointer(void);

/* __cmpxchg_u32/u64 defined in arch/parisc/lib/bitops.c */
extern unsigned long __cmpxchg_u32(volatile unsigned int *m, unsigned int old,
				   unsigned int new_);
extern u64 __cmpxchg_u64(volatile u64 *ptr, u64 old, u64 new_);

/* don't worry...optimizer will get rid of most of this */
static inline unsigned long
__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size)
{
	switch (size) {
#ifdef CONFIG_64BIT
	case 8: return __cmpxchg_u64((u64 *)ptr, old, new_);
#endif
	case 4: return __cmpxchg_u32((unsigned int *)ptr,
				     (unsigned int)old, (unsigned int)new_);
	}
	__cmpxchg_called_with_bad_pointer();
	return old;
}

#define cmpxchg(ptr, o, n)						 \
({									 \
	__typeof__(*(ptr)) _o_ = (o);					 \
	__typeof__(*(ptr)) _n_ = (n);					 \
	(__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_,	 \
				    (unsigned long)_n_, sizeof(*(ptr))); \
})

#include <asm-generic/cmpxchg-local.h>

static inline unsigned long __cmpxchg_local(volatile void *ptr,
				      unsigned long old,
				      unsigned long new_, int size)
{
	switch (size) {
#ifdef CONFIG_64BIT
	case 8:	return __cmpxchg_u64((u64 *)ptr, old, new_);
#endif
	case 4:	return __cmpxchg_u32(ptr, old, new_);
	default:
		return __cmpxchg_local_generic(ptr, old, new_, size);
	}
}

/*
 * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
 * them available.
 */
#define cmpxchg_local(ptr, o, n)					\
	((__typeof__(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(o),	\
			(unsigned long)(n), sizeof(*(ptr))))
#ifdef CONFIG_64BIT
#define cmpxchg64_local(ptr, o, n)					\
({									\
	BUILD_BUG_ON(sizeof(*(ptr)) != 8);				\
	cmpxchg_local((ptr), (o), (n));					\
})
#else
#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
#endif

#define cmpxchg64(ptr, o, n) __cmpxchg_u64(ptr, o, n)

#endif /* _ASM_PARISC_CMPXCHG_H_ */
Commit	Line	Data
9e5228ce PG	1	/*
	2	* forked from parisc asm/atomic.h which was:
	3	* Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
	4	* Copyright (C) 2006 Kyle McMartin <kyle@parisc-linux.org>
	5	*/
	6
	7	#ifndef _ASM_PARISC_CMPXCHG_H_
	8	#define _ASM_PARISC_CMPXCHG_H_
	9
	10	/* This should get optimized out since it's never called.
	11	** Or get a link error if xchg is used "wrong".
	12	*/
	13	extern void __xchg_called_with_bad_pointer(void);
	14
	15	/* __xchg32/64 defined in arch/parisc/lib/bitops.c */
	16	extern unsigned long __xchg8(char, char *);
	17	extern unsigned long __xchg32(int, int *);
	18	#ifdef CONFIG_64BIT
	19	extern unsigned long __xchg64(unsigned long, unsigned long *);
	20	#endif
	21
	22	/* optimizer better get rid of switch since size is a constant */
	23	static inline unsigned long
	24	__xchg(unsigned long x, __volatile__ void *ptr, int size)
	25	{
	26	switch (size) {
	27	#ifdef CONFIG_64BIT
	28	case 8: return __xchg64(x, (unsigned long *) ptr);
	29	#endif
	30	case 4: return __xchg32((int) x, (int *) ptr);
	31	case 1: return __xchg8((char) x, (char *) ptr);
	32	}
	33	__xchg_called_with_bad_pointer();
	34	return x;
	35	}
	36
	37	/*
	38	** REVISIT - Abandoned use of LDCW in xchg() for now:
	39	** o need to test sizeof(*ptr) to avoid clearing adjacent bytes
	40	** o and while we are at it, could CONFIG_64BIT code use LDCD too?
	41	**
	42	** if (__builtin_constant_p(x) && (x == NULL))
	43	** if (((unsigned long)p & 0xf) == 0)
	44	** return __ldcw(p);
	45	*/
	46	#define xchg(ptr, x) \
	47	((__typeof__((ptr)))__xchg((unsigned long)(x), (ptr), sizeof((ptr))))
	48
9e5228ce PG	49	/* bug catcher for when unsupported size is used - won't link */
	50	extern void __cmpxchg_called_with_bad_pointer(void);
	51
	52	/* __cmpxchg_u32/u64 defined in arch/parisc/lib/bitops.c */
	53	extern unsigned long __cmpxchg_u32(volatile unsigned int *m, unsigned int old,
	54	unsigned int new_);
54b66800	55	extern u64 __cmpxchg_u64(volatile u64 *ptr, u64 old, u64 new_);
9e5228ce PG	56
	57	/* don't worry...optimizer will get rid of most of this */
	58	static inline unsigned long
	59	__cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size)
	60	{
	61	switch (size) {
	62	#ifdef CONFIG_64BIT
54b66800	63	case 8: return __cmpxchg_u64((u64 *)ptr, old, new_);
9e5228ce PG	64	#endif
	65	case 4: return __cmpxchg_u32((unsigned int *)ptr,
	66	(unsigned int)old, (unsigned int)new_);
	67	}
	68	__cmpxchg_called_with_bad_pointer();
	69	return old;
	70	}
	71
	72	#define cmpxchg(ptr, o, n) \
	73	({ \
	74	__typeof__(*(ptr)) _o_ = (o); \
	75	__typeof__(*(ptr)) _n_ = (n); \
	76	(__typeof__(*(ptr))) __cmpxchg((ptr), (unsigned long)_o_, \
	77	(unsigned long)_n_, sizeof(*(ptr))); \
	78	})
	79
	80	#include <asm-generic/cmpxchg-local.h>
	81
	82	static inline unsigned long __cmpxchg_local(volatile void *ptr,
	83	unsigned long old,
	84	unsigned long new_, int size)
	85	{
	86	switch (size) {
	87	#ifdef CONFIG_64BIT
54b66800	88	case 8: return __cmpxchg_u64((u64 *)ptr, old, new_);
9e5228ce PG	89	#endif
	90	case 4: return __cmpxchg_u32(ptr, old, new_);
	91	default:
	92	return __cmpxchg_local_generic(ptr, old, new_, size);
	93	}
	94	}
	95
	96	/*
	97	* cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
	98	* them available.
	99	*/
	100	#define cmpxchg_local(ptr, o, n) \
	101	((__typeof__(*(ptr)))__cmpxchg_local((ptr), (unsigned long)(o), \
	102	(unsigned long)(n), sizeof(*(ptr))))
	103	#ifdef CONFIG_64BIT
	104	#define cmpxchg64_local(ptr, o, n) \
	105	({ \
	106	BUILD_BUG_ON(sizeof(*(ptr)) != 8); \
	107	cmpxchg_local((ptr), (o), (n)); \
	108	})
	109	#else
	110	#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
	111	#endif
	112
54b66800 HD	113	#define cmpxchg64(ptr, o, n) __cmpxchg_u64(ptr, o, n)
54b66800 HD	114
9e5228ce	115	#endif /* _ASM_PARISC_CMPXCHG_H_ */