[mirror_ubuntu-focal-kernel.git] / arch / ia64 / include / asm / atomic.h

#ifndef _ASM_IA64_ATOMIC_H
#define _ASM_IA64_ATOMIC_H

/*
 * Atomic operations that C can't guarantee us.  Useful for
 * resource counting etc..
 *
 * NOTE: don't mess with the types below!  The "unsigned long" and
 * "int" types were carefully placed so as to ensure proper operation
 * of the macros.
 *
 * Copyright (C) 1998, 1999, 2002-2003 Hewlett-Packard Co
 *	David Mosberger-Tang <davidm@hpl.hp.com>
 */
#include <linux/types.h>

#include <asm/intrinsics.h>
#include <asm/system.h>


#define ATOMIC_INIT(i)		((atomic_t) { (i) })
#define ATOMIC64_INIT(i)	((atomic64_t) { (i) })

#define atomic_read(v)		(*(volatile int *)&(v)->counter)
#define atomic64_read(v)	(*(volatile long *)&(v)->counter)

#define atomic_set(v,i)		(((v)->counter) = (i))
#define atomic64_set(v,i)	(((v)->counter) = (i))

static __inline__ int
ia64_atomic_add (int i, atomic_t *v)
{
	__s32 old, new;
	CMPXCHG_BUGCHECK_DECL

	do {
		CMPXCHG_BUGCHECK(v);
		old = atomic_read(v);
		new = old + i;
	} while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old);
	return new;
}

static __inline__ long
ia64_atomic64_add (__s64 i, atomic64_t *v)
{
	__s64 old, new;
	CMPXCHG_BUGCHECK_DECL

	do {
		CMPXCHG_BUGCHECK(v);
		old = atomic64_read(v);
		new = old + i;
	} while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old);
	return new;
}

static __inline__ int
ia64_atomic_sub (int i, atomic_t *v)
{
	__s32 old, new;
	CMPXCHG_BUGCHECK_DECL

	do {
		CMPXCHG_BUGCHECK(v);
		old = atomic_read(v);
		new = old - i;
	} while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old);
	return new;
}

static __inline__ long
ia64_atomic64_sub (__s64 i, atomic64_t *v)
{
	__s64 old, new;
	CMPXCHG_BUGCHECK_DECL

	do {
		CMPXCHG_BUGCHECK(v);
		old = atomic64_read(v);
		new = old - i;
	} while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old);
	return new;
}

#define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))

#define atomic64_cmpxchg(v, old, new) \
	(cmpxchg(&((v)->counter), old, new))
#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))

static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
{
	int c, old;
	c = atomic_read(v);
	for (;;) {
		if (unlikely(c == (u)))
			break;
		old = atomic_cmpxchg((v), c, c + (a));
		if (likely(old == c))
			break;
		c = old;
	}
	return c != (u);
}


static __inline__ long atomic64_add_unless(atomic64_t *v, long a, long u)
{
	long c, old;
	c = atomic64_read(v);
	for (;;) {
		if (unlikely(c == (u)))
			break;
		old = atomic64_cmpxchg((v), c, c + (a));
		if (likely(old == c))
			break;
		c = old;
	}
	return c != (u);
}

#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)

#define atomic_add_return(i,v)						\
({									\
	int __ia64_aar_i = (i);						\
	(__builtin_constant_p(i)					\
	 && (   (__ia64_aar_i ==  1) || (__ia64_aar_i ==   4)		\
	     || (__ia64_aar_i ==  8) || (__ia64_aar_i ==  16)		\
	     || (__ia64_aar_i == -1) || (__ia64_aar_i ==  -4)		\
	     || (__ia64_aar_i == -8) || (__ia64_aar_i == -16)))		\
		? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter)	\
		: ia64_atomic_add(__ia64_aar_i, v);			\
})

#define atomic64_add_return(i,v)					\
({									\
	long __ia64_aar_i = (i);					\
	(__builtin_constant_p(i)					\
	 && (   (__ia64_aar_i ==  1) || (__ia64_aar_i ==   4)		\
	     || (__ia64_aar_i ==  8) || (__ia64_aar_i ==  16)		\
	     || (__ia64_aar_i == -1) || (__ia64_aar_i ==  -4)		\
	     || (__ia64_aar_i == -8) || (__ia64_aar_i == -16)))		\
		? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter)	\
		: ia64_atomic64_add(__ia64_aar_i, v);			\
})

/*
 * Atomically add I to V and return TRUE if the resulting value is
 * negative.
 */
static __inline__ int
atomic_add_negative (int i, atomic_t *v)
{
	return atomic_add_return(i, v) < 0;
}

static __inline__ long
atomic64_add_negative (__s64 i, atomic64_t *v)
{
	return atomic64_add_return(i, v) < 0;
}

#define atomic_sub_return(i,v)						\
({									\
	int __ia64_asr_i = (i);						\
	(__builtin_constant_p(i)					\
	 && (   (__ia64_asr_i ==   1) || (__ia64_asr_i ==   4)		\
	     || (__ia64_asr_i ==   8) || (__ia64_asr_i ==  16)		\
	     || (__ia64_asr_i ==  -1) || (__ia64_asr_i ==  -4)		\
	     || (__ia64_asr_i ==  -8) || (__ia64_asr_i == -16)))	\
		? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter)	\
		: ia64_atomic_sub(__ia64_asr_i, v);			\
})

#define atomic64_sub_return(i,v)					\
({									\
	long __ia64_asr_i = (i);					\
	(__builtin_constant_p(i)					\
	 && (   (__ia64_asr_i ==   1) || (__ia64_asr_i ==   4)		\
	     || (__ia64_asr_i ==   8) || (__ia64_asr_i ==  16)		\
	     || (__ia64_asr_i ==  -1) || (__ia64_asr_i ==  -4)		\
	     || (__ia64_asr_i ==  -8) || (__ia64_asr_i == -16)))	\
		? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter)	\
		: ia64_atomic64_sub(__ia64_asr_i, v);			\
})

#define atomic_dec_return(v)		atomic_sub_return(1, (v))
#define atomic_inc_return(v)		atomic_add_return(1, (v))
#define atomic64_dec_return(v)		atomic64_sub_return(1, (v))
#define atomic64_inc_return(v)		atomic64_add_return(1, (v))

#define atomic_sub_and_test(i,v)	(atomic_sub_return((i), (v)) == 0)
#define atomic_dec_and_test(v)		(atomic_sub_return(1, (v)) == 0)
#define atomic_inc_and_test(v)		(atomic_add_return(1, (v)) == 0)
#define atomic64_sub_and_test(i,v)	(atomic64_sub_return((i), (v)) == 0)
#define atomic64_dec_and_test(v)	(atomic64_sub_return(1, (v)) == 0)
#define atomic64_inc_and_test(v)	(atomic64_add_return(1, (v)) == 0)

#define atomic_add(i,v)			atomic_add_return((i), (v))
#define atomic_sub(i,v)			atomic_sub_return((i), (v))
#define atomic_inc(v)			atomic_add(1, (v))
#define atomic_dec(v)			atomic_sub(1, (v))

#define atomic64_add(i,v)		atomic64_add_return((i), (v))
#define atomic64_sub(i,v)		atomic64_sub_return((i), (v))
#define atomic64_inc(v)			atomic64_add(1, (v))
#define atomic64_dec(v)			atomic64_sub(1, (v))

/* Atomic operations are already serializing */
#define smp_mb__before_atomic_dec()	barrier()
#define smp_mb__after_atomic_dec()	barrier()
#define smp_mb__before_atomic_inc()	barrier()
#define smp_mb__after_atomic_inc()	barrier()

#include <asm-generic/atomic-long.h>
#endif /* _ASM_IA64_ATOMIC_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _ASM_IA64_ATOMIC_H
	2	#define _ASM_IA64_ATOMIC_H
	3
	4	/*
	5	* Atomic operations that C can't guarantee us. Useful for
	6	* resource counting etc..
	7	*
	8	* NOTE: don't mess with the types below! The "unsigned long" and
	9	* "int" types were carefully placed so as to ensure proper operation
	10	* of the macros.
	11	*
	12	* Copyright (C) 1998, 1999, 2002-2003 Hewlett-Packard Co
	13	* David Mosberger-Tang <davidm@hpl.hp.com>
	14	*/
	15	#include <linux/types.h>
	16
	17	#include <asm/intrinsics.h>
2856f5e3	18	#include <asm/system.h>
1da177e4	19
1da177e4 LT	20
	21	#define ATOMIC_INIT(i) ((atomic_t) { (i) })
	22	#define ATOMIC64_INIT(i) ((atomic64_t) { (i) })
	23
f3d46f9d AB	24	#define atomic_read(v) ((volatile int )&(v)->counter)
f3d46f9d AB	25	#define atomic64_read(v) ((volatile long )&(v)->counter)
1da177e4 LT	26
	27	#define atomic_set(v,i) (((v)->counter) = (i))
	28	#define atomic64_set(v,i) (((v)->counter) = (i))
	29
	30	static __inline__ int
	31	ia64_atomic_add (int i, atomic_t *v)
	32	{
	33	__s32 old, new;
	34	CMPXCHG_BUGCHECK_DECL
	35
	36	do {
	37	CMPXCHG_BUGCHECK(v);
	38	old = atomic_read(v);
	39	new = old + i;
	40	} while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old);
	41	return new;
	42	}
	43
01d69a82	44	static __inline__ long
1da177e4 LT	45	ia64_atomic64_add (__s64 i, atomic64_t *v)
	46	{
	47	__s64 old, new;
	48	CMPXCHG_BUGCHECK_DECL
	49
	50	do {
	51	CMPXCHG_BUGCHECK(v);
6cba9862	52	old = atomic64_read(v);
1da177e4 LT	53	new = old + i;
	54	} while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old);
	55	return new;
	56	}
	57
	58	static __inline__ int
	59	ia64_atomic_sub (int i, atomic_t *v)
	60	{
	61	__s32 old, new;
	62	CMPXCHG_BUGCHECK_DECL
	63
	64	do {
	65	CMPXCHG_BUGCHECK(v);
	66	old = atomic_read(v);
	67	new = old - i;
	68	} while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic_t)) != old);
	69	return new;
	70	}
	71
01d69a82	72	static __inline__ long
1da177e4 LT	73	ia64_atomic64_sub (__s64 i, atomic64_t *v)
	74	{
	75	__s64 old, new;
	76	CMPXCHG_BUGCHECK_DECL
	77
	78	do {
	79	CMPXCHG_BUGCHECK(v);
6cba9862	80	old = atomic64_read(v);
1da177e4 LT	81	new = old - i;
	82	} while (ia64_cmpxchg(acq, v, old, new, sizeof(atomic64_t)) != old);
	83	return new;
	84	}
	85
81979131	86	#define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))
ffbf670f	87	#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
4a6dae6d	88
81979131 MD	89	#define atomic64_cmpxchg(v, old, new) \
	90	(cmpxchg(&((v)->counter), old, new))
	91	#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
	92
2856f5e3 MD	93	static __inline__ int atomic_add_unless(atomic_t *v, int a, int u)
	94	{
	95	int c, old;
	96	c = atomic_read(v);
	97	for (;;) {
	98	if (unlikely(c == (u)))
	99	break;
	100	old = atomic_cmpxchg((v), c, c + (a));
	101	if (likely(old == c))
	102	break;
	103	c = old;
	104	}
	105	return c != (u);
	106	}
	107
8426e1f6	108
01d69a82	109	static __inline__ long atomic64_add_unless(atomic64_t *v, long a, long u)
2856f5e3 MD	110	{
	111	long c, old;
	112	c = atomic64_read(v);
	113	for (;;) {
	114	if (unlikely(c == (u)))
	115	break;
	116	old = atomic64_cmpxchg((v), c, c + (a));
	117	if (likely(old == c))
	118	break;
	119	c = old;
	120	}
	121	return c != (u);
	122	}
	123
81979131 MD	124	#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
81979131 MD	125
1da177e4 LT	126	#define atomic_add_return(i,v) \
	127	({ \
	128	int __ia64_aar_i = (i); \
	129	(__builtin_constant_p(i) \
	130	&& ( (__ia64_aar_i == 1) \|\| (__ia64_aar_i == 4) \
	131	\|\| (__ia64_aar_i == 8) \|\| (__ia64_aar_i == 16) \
	132	\|\| (__ia64_aar_i == -1) \|\| (__ia64_aar_i == -4) \
	133	\|\| (__ia64_aar_i == -8) \|\| (__ia64_aar_i == -16))) \
	134	? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter) \
	135	: ia64_atomic_add(__ia64_aar_i, v); \
	136	})
	137
	138	#define atomic64_add_return(i,v) \
	139	({ \
	140	long __ia64_aar_i = (i); \
	141	(__builtin_constant_p(i) \
	142	&& ( (__ia64_aar_i == 1) \|\| (__ia64_aar_i == 4) \
	143	\|\| (__ia64_aar_i == 8) \|\| (__ia64_aar_i == 16) \
	144	\|\| (__ia64_aar_i == -1) \|\| (__ia64_aar_i == -4) \
	145	\|\| (__ia64_aar_i == -8) \|\| (__ia64_aar_i == -16))) \
	146	? ia64_fetch_and_add(__ia64_aar_i, &(v)->counter) \
	147	: ia64_atomic64_add(__ia64_aar_i, v); \
	148	})
	149
	150	/*
	151	* Atomically add I to V and return TRUE if the resulting value is
	152	* negative.
	153	*/
	154	static __inline__ int
	155	atomic_add_negative (int i, atomic_t *v)
	156	{
	157	return atomic_add_return(i, v) < 0;
	158	}
	159
01d69a82	160	static __inline__ long
1da177e4 LT	161	atomic64_add_negative (__s64 i, atomic64_t *v)
	162	{
	163	return atomic64_add_return(i, v) < 0;
	164	}
	165
	166	#define atomic_sub_return(i,v) \
	167	({ \
	168	int __ia64_asr_i = (i); \
	169	(__builtin_constant_p(i) \
	170	&& ( (__ia64_asr_i == 1) \|\| (__ia64_asr_i == 4) \
	171	\|\| (__ia64_asr_i == 8) \|\| (__ia64_asr_i == 16) \
	172	\|\| (__ia64_asr_i == -1) \|\| (__ia64_asr_i == -4) \
	173	\|\| (__ia64_asr_i == -8) \|\| (__ia64_asr_i == -16))) \
	174	? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter) \
	175	: ia64_atomic_sub(__ia64_asr_i, v); \
	176	})
	177
	178	#define atomic64_sub_return(i,v) \
	179	({ \
	180	long __ia64_asr_i = (i); \
	181	(__builtin_constant_p(i) \
	182	&& ( (__ia64_asr_i == 1) \|\| (__ia64_asr_i == 4) \
	183	\|\| (__ia64_asr_i == 8) \|\| (__ia64_asr_i == 16) \
	184	\|\| (__ia64_asr_i == -1) \|\| (__ia64_asr_i == -4) \
	185	\|\| (__ia64_asr_i == -8) \|\| (__ia64_asr_i == -16))) \
	186	? ia64_fetch_and_add(-__ia64_asr_i, &(v)->counter) \
	187	: ia64_atomic64_sub(__ia64_asr_i, v); \
	188	})
	189
	190	#define atomic_dec_return(v) atomic_sub_return(1, (v))
	191	#define atomic_inc_return(v) atomic_add_return(1, (v))
	192	#define atomic64_dec_return(v) atomic64_sub_return(1, (v))
	193	#define atomic64_inc_return(v) atomic64_add_return(1, (v))
	194
	195	#define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
	196	#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
	197	#define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0)
	198	#define atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0)
	199	#define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0)
	200	#define atomic64_inc_and_test(v) (atomic64_add_return(1, (v)) == 0)
	201
	202	#define atomic_add(i,v) atomic_add_return((i), (v))
	203	#define atomic_sub(i,v) atomic_sub_return((i), (v))
	204	#define atomic_inc(v) atomic_add(1, (v))
	205	#define atomic_dec(v) atomic_sub(1, (v))
	206
	207	#define atomic64_add(i,v) atomic64_add_return((i), (v))
	208	#define atomic64_sub(i,v) atomic64_sub_return((i), (v))
	209	#define atomic64_inc(v) atomic64_add(1, (v))
	210	#define atomic64_dec(v) atomic64_sub(1, (v))
	211
	212	/* Atomic operations are already serializing */
	213	#define smp_mb__before_atomic_dec() barrier()
	214	#define smp_mb__after_atomic_dec() barrier()
	215	#define smp_mb__before_atomic_inc() barrier()
	216	#define smp_mb__after_atomic_inc() barrier()
	217
72099ed2	218	#include <asm-generic/atomic-long.h>
1da177e4	219	#endif /* _ASM_IA64_ATOMIC_H */