[deliverable/linux.git] / arch / alpha / include / asm / atomic.h

#ifndef _ALPHA_ATOMIC_H
#define _ALPHA_ATOMIC_H

#include <linux/types.h>
#include <asm/barrier.h>
#include <asm/cmpxchg.h>

/*
 * Atomic operations that C can't guarantee us.  Useful for
 * resource counting etc...
 *
 * But use these as seldom as possible since they are much slower
 * than regular operations.
 */


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

/*
 * To get proper branch prediction for the main line, we must branch
 * forward to code at the end of this object's .text section, then
 * branch back to restart the operation.
 */

#define ATOMIC_OP(op)							\
static __inline__ void atomic_##op(int i, atomic_t * v)			\
{									\
	unsigned long temp;						\
	__asm__ __volatile__(						\
	"1:	ldl_l %0,%1\n"						\
	"	" #op "l %0,%2,%0\n"					\
	"	stl_c %0,%1\n"						\
	"	beq %0,2f\n"						\
	".subsection 2\n"						\
	"2:	br 1b\n"						\
	".previous"							\
	:"=&r" (temp), "=m" (v->counter)				\
	:"Ir" (i), "m" (v->counter));					\
}									\

#define ATOMIC_OP_RETURN(op)						\
static inline int atomic_##op##_return(int i, atomic_t *v)		\
{									\
	long temp, result;						\
	smp_mb();							\
	__asm__ __volatile__(						\
	"1:	ldl_l %0,%1\n"						\
	"	" #op "l %0,%3,%2\n"					\
	"	" #op "l %0,%3,%0\n"					\
	"	stl_c %0,%1\n"						\
	"	beq %0,2f\n"						\
	".subsection 2\n"						\
	"2:	br 1b\n"						\
	".previous"							\
	:"=&r" (temp), "=m" (v->counter), "=&r" (result)		\
	:"Ir" (i), "m" (v->counter) : "memory");			\
	smp_mb();							\
	return result;							\
}

#define ATOMIC64_OP(op)							\
static __inline__ void atomic64_##op(long i, atomic64_t * v)		\
{									\
	unsigned long temp;						\
	__asm__ __volatile__(						\
	"1:	ldq_l %0,%1\n"						\
	"	" #op "q %0,%2,%0\n"					\
	"	stq_c %0,%1\n"						\
	"	beq %0,2f\n"						\
	".subsection 2\n"						\
	"2:	br 1b\n"						\
	".previous"							\
	:"=&r" (temp), "=m" (v->counter)				\
	:"Ir" (i), "m" (v->counter));					\
}									\

#define ATOMIC64_OP_RETURN(op)						\
static __inline__ long atomic64_##op##_return(long i, atomic64_t * v)	\
{									\
	long temp, result;						\
	smp_mb();							\
	__asm__ __volatile__(						\
	"1:	ldq_l %0,%1\n"						\
	"	" #op "q %0,%3,%2\n"					\
	"	" #op "q %0,%3,%0\n"					\
	"	stq_c %0,%1\n"						\
	"	beq %0,2f\n"						\
	".subsection 2\n"						\
	"2:	br 1b\n"						\
	".previous"							\
	:"=&r" (temp), "=m" (v->counter), "=&r" (result)		\
	:"Ir" (i), "m" (v->counter) : "memory");			\
	smp_mb();							\
	return result;							\
}

#define ATOMIC_OPS(opg)							\
	ATOMIC_OP(opg)							\
	ATOMIC_OP_RETURN(opg)						\
	ATOMIC64_OP(opg)						\
	ATOMIC64_OP_RETURN(opg)

ATOMIC_OPS(add)
ATOMIC_OPS(sub)

#undef ATOMIC_OPS
#undef ATOMIC64_OP_RETURN
#undef ATOMIC64_OP
#undef ATOMIC_OP_RETURN
#undef ATOMIC_OP

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

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

/**
 * __atomic_add_unless - add unless the number is a given value
 * @v: pointer of type atomic_t
 * @a: the amount to add to v...
 * @u: ...unless v is equal to u.
 *
 * Atomically adds @a to @v, so long as it was not @u.
 * Returns the old value of @v.
 */
static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
{
	int c, new, old;
	smp_mb();
	__asm__ __volatile__(
	"1:	ldl_l	%[old],%[mem]\n"
	"	cmpeq	%[old],%[u],%[c]\n"
	"	addl	%[old],%[a],%[new]\n"
	"	bne	%[c],2f\n"
	"	stl_c	%[new],%[mem]\n"
	"	beq	%[new],3f\n"
	"2:\n"
	".subsection 2\n"
	"3:	br	1b\n"
	".previous"
	: [old] "=&r"(old), [new] "=&r"(new), [c] "=&r"(c)
	: [mem] "m"(*v), [a] "rI"(a), [u] "rI"((long)u)
	: "memory");
	smp_mb();
	return old;
}


/**
 * atomic64_add_unless - add unless the number is a given value
 * @v: pointer of type atomic64_t
 * @a: the amount to add to v...
 * @u: ...unless v is equal to u.
 *
 * Atomically adds @a to @v, so long as it was not @u.
 * Returns true iff @v was not @u.
 */
static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
{
	long c, tmp;
	smp_mb();
	__asm__ __volatile__(
	"1:	ldq_l	%[tmp],%[mem]\n"
	"	cmpeq	%[tmp],%[u],%[c]\n"
	"	addq	%[tmp],%[a],%[tmp]\n"
	"	bne	%[c],2f\n"
	"	stq_c	%[tmp],%[mem]\n"
	"	beq	%[tmp],3f\n"
	"2:\n"
	".subsection 2\n"
	"3:	br	1b\n"
	".previous"
	: [tmp] "=&r"(tmp), [c] "=&r"(c)
	: [mem] "m"(*v), [a] "rI"(a), [u] "rI"(u)
	: "memory");
	smp_mb();
	return !c;
}

/*
 * atomic64_dec_if_positive - decrement by 1 if old value positive
 * @v: pointer of type atomic_t
 *
 * The function returns the old value of *v minus 1, even if
 * the atomic variable, v, was not decremented.
 */
static inline long atomic64_dec_if_positive(atomic64_t *v)
{
	long old, tmp;
	smp_mb();
	__asm__ __volatile__(
	"1:	ldq_l	%[old],%[mem]\n"
	"	subq	%[old],1,%[tmp]\n"
	"	ble	%[old],2f\n"
	"	stq_c	%[tmp],%[mem]\n"
	"	beq	%[tmp],3f\n"
	"2:\n"
	".subsection 2\n"
	"3:	br	1b\n"
	".previous"
	: [old] "=&r"(old), [tmp] "=&r"(tmp)
	: [mem] "m"(*v)
	: "memory");
	smp_mb();
	return old - 1;
}

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

#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
#define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0)

#define atomic_dec_return(v) atomic_sub_return(1,(v))
#define atomic64_dec_return(v) atomic64_sub_return(1,(v))

#define atomic_inc_return(v) atomic_add_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 atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0)

#define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0)
#define atomic64_inc_and_test(v) (atomic64_add_return(1, (v)) == 0)

#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
#define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0)

#define atomic_inc(v) atomic_add(1,(v))
#define atomic64_inc(v) atomic64_add(1,(v))

#define atomic_dec(v) atomic_sub(1,(v))
#define atomic64_dec(v) atomic64_sub(1,(v))

#endif /* _ALPHA_ATOMIC_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _ALPHA_ATOMIC_H
	2	#define _ALPHA_ATOMIC_H
	3
ea435467	4	#include <linux/types.h>
0db9ae4a	5	#include <asm/barrier.h>
5ba840f9	6	#include <asm/cmpxchg.h>
0db9ae4a	7
1da177e4 LT	8	/*
	9	* Atomic operations that C can't guarantee us. Useful for
	10	* resource counting etc...
	11	*
	12	* But use these as seldom as possible since they are much slower
	13	* than regular operations.
	14	*/
	15
	16
67a806d9 MG	17	#define ATOMIC_INIT(i) { (i) }
67a806d9 MG	18	#define ATOMIC64_INIT(i) { (i) }
1da177e4	19
f3d46f9d AB	20	#define atomic_read(v) ((volatile int )&(v)->counter)
f3d46f9d AB	21	#define atomic64_read(v) ((volatile long )&(v)->counter)
1da177e4 LT	22
	23	#define atomic_set(v,i) ((v)->counter = (i))
	24	#define atomic64_set(v,i) ((v)->counter = (i))
	25
	26	/*
	27	* To get proper branch prediction for the main line, we must branch
	28	* forward to code at the end of this object's .text section, then
	29	* branch back to restart the operation.
	30	*/
	31
b93c7b8c PZ	32	#define ATOMIC_OP(op) \
	33	static __inline__ void atomic_##op(int i, atomic_t * v) \
	34	{ \
	35	unsigned long temp; \
	36	__asm__ __volatile__( \
	37	"1: ldl_l %0,%1\n" \
	38	" " #op "l %0,%2,%0\n" \
	39	" stl_c %0,%1\n" \
	40	" beq %0,2f\n" \
	41	".subsection 2\n" \
	42	"2: br 1b\n" \
	43	".previous" \
	44	:"=&r" (temp), "=m" (v->counter) \
	45	:"Ir" (i), "m" (v->counter)); \
	46	} \
	47
	48	#define ATOMIC_OP_RETURN(op) \
	49	static inline int atomic_##op##_return(int i, atomic_t *v) \
	50	{ \
	51	long temp, result; \
	52	smp_mb(); \
	53	__asm__ __volatile__( \
	54	"1: ldl_l %0,%1\n" \
	55	" " #op "l %0,%3,%2\n" \
	56	" " #op "l %0,%3,%0\n" \
	57	" stl_c %0,%1\n" \
	58	" beq %0,2f\n" \
	59	".subsection 2\n" \
	60	"2: br 1b\n" \
	61	".previous" \
	62	:"=&r" (temp), "=m" (v->counter), "=&r" (result) \
	63	:"Ir" (i), "m" (v->counter) : "memory"); \
	64	smp_mb(); \
	65	return result; \
1da177e4 LT	66	}
1da177e4 LT	67
b93c7b8c PZ	68	#define ATOMIC64_OP(op) \
	69	static __inline__ void atomic64_##op(long i, atomic64_t * v) \
	70	{ \
	71	unsigned long temp; \
	72	__asm__ __volatile__( \
	73	"1: ldq_l %0,%1\n" \
	74	" " #op "q %0,%2,%0\n" \
	75	" stq_c %0,%1\n" \
	76	" beq %0,2f\n" \
	77	".subsection 2\n" \
	78	"2: br 1b\n" \
	79	".previous" \
	80	:"=&r" (temp), "=m" (v->counter) \
	81	:"Ir" (i), "m" (v->counter)); \
	82	} \
	83
	84	#define ATOMIC64_OP_RETURN(op) \
	85	static __inline__ long atomic64_##op##_return(long i, atomic64_t * v) \
	86	{ \
	87	long temp, result; \
	88	smp_mb(); \
	89	__asm__ __volatile__( \
	90	"1: ldq_l %0,%1\n" \
	91	" " #op "q %0,%3,%2\n" \
	92	" " #op "q %0,%3,%0\n" \
	93	" stq_c %0,%1\n" \
	94	" beq %0,2f\n" \
	95	".subsection 2\n" \
	96	"2: br 1b\n" \
	97	".previous" \
	98	:"=&r" (temp), "=m" (v->counter), "=&r" (result) \
	99	:"Ir" (i), "m" (v->counter) : "memory"); \
	100	smp_mb(); \
	101	return result; \
1da177e4 LT	102	}
1da177e4 LT	103
b93c7b8c PZ	104	#define ATOMIC_OPS(opg) \
	105	ATOMIC_OP(opg) \
	106	ATOMIC_OP_RETURN(opg) \
	107	ATOMIC64_OP(opg) \
	108	ATOMIC64_OP_RETURN(opg)
1da177e4	109
b93c7b8c PZ	110	ATOMIC_OPS(add)
b93c7b8c PZ	111	ATOMIC_OPS(sub)
1da177e4	112
b93c7b8c PZ	113	#undef ATOMIC_OPS
	114	#undef ATOMIC64_OP_RETURN
	115	#undef ATOMIC64_OP
	116	#undef ATOMIC_OP_RETURN
	117	#undef ATOMIC_OP
1da177e4	118
e96e6994 MD	119	#define atomic64_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))
	120	#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
	121
	122	#define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))
ffbf670f	123	#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
4a6dae6d	124
e96e6994	125	/**
f24219b4	126	* __atomic_add_unless - add unless the number is a given value
e96e6994 MD	127	* @v: pointer of type atomic_t
	128	* @a: the amount to add to v...
	129	* @u: ...unless v is equal to u.
	130	*
	131	* Atomically adds @a to @v, so long as it was not @u.
f24219b4	132	* Returns the old value of @v.
e96e6994	133	*/
f24219b4	134	static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u)
2856f5e3	135	{
6da75397 RH	136	int c, new, old;
	137	smp_mb();
	138	__asm__ __volatile__(
	139	"1: ldl_l %[old],%[mem]\n"
	140	" cmpeq %[old],%[u],%[c]\n"
	141	" addl %[old],%[a],%[new]\n"
	142	" bne %[c],2f\n"
	143	" stl_c %[new],%[mem]\n"
	144	" beq %[new],3f\n"
	145	"2:\n"
	146	".subsection 2\n"
	147	"3: br 1b\n"
	148	".previous"
	149	: [old] "=&r"(old), [new] "=&r"(new), [c] "=&r"(c)
	150	: [mem] "m"(*v), [a] "rI"(a), [u] "rI"((long)u)
	151	: "memory");
	152	smp_mb();
	153	return old;
2856f5e3 MD	154	}
2856f5e3 MD	155
8426e1f6	156
e96e6994 MD	157	/**
	158	* atomic64_add_unless - add unless the number is a given value
	159	* @v: pointer of type atomic64_t
	160	* @a: the amount to add to v...
	161	* @u: ...unless v is equal to u.
	162	*
	163	* Atomically adds @a to @v, so long as it was not @u.
6da75397	164	* Returns true iff @v was not @u.
e96e6994	165	*/
2856f5e3 MD	166	static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u)
2856f5e3 MD	167	{
6da75397 RH	168	long c, tmp;
	169	smp_mb();
	170	__asm__ __volatile__(
	171	"1: ldq_l %[tmp],%[mem]\n"
	172	" cmpeq %[tmp],%[u],%[c]\n"
	173	" addq %[tmp],%[a],%[tmp]\n"
	174	" bne %[c],2f\n"
	175	" stq_c %[tmp],%[mem]\n"
	176	" beq %[tmp],3f\n"
	177	"2:\n"
	178	".subsection 2\n"
	179	"3: br 1b\n"
	180	".previous"
	181	: [tmp] "=&r"(tmp), [c] "=&r"(c)
	182	: [mem] "m"(*v), [a] "rI"(a), [u] "rI"(u)
	183	: "memory");
	184	smp_mb();
	185	return !c;
2856f5e3 MD	186	}
2856f5e3 MD	187
748a76b5 RH	188	/*
	189	* atomic64_dec_if_positive - decrement by 1 if old value positive
	190	* @v: pointer of type atomic_t
	191	*
	192	* The function returns the old value of *v minus 1, even if
	193	* the atomic variable, v, was not decremented.
	194	*/
	195	static inline long atomic64_dec_if_positive(atomic64_t *v)
	196	{
	197	long old, tmp;
	198	smp_mb();
	199	__asm__ __volatile__(
	200	"1: ldq_l %[old],%[mem]\n"
	201	" subq %[old],1,%[tmp]\n"
	202	" ble %[old],2f\n"
	203	" stq_c %[tmp],%[mem]\n"
	204	" beq %[tmp],3f\n"
	205	"2:\n"
	206	".subsection 2\n"
	207	"3: br 1b\n"
	208	".previous"
	209	: [old] "=&r"(old), [tmp] "=&r"(tmp)
	210	: [mem] "m"(*v)
	211	: "memory");
	212	smp_mb();
	213	return old - 1;
	214	}
	215
e96e6994 MD	216	#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
e96e6994 MD	217
7c72aaf2 HD	218	#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
	219	#define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0)
	220
1da177e4 LT	221	#define atomic_dec_return(v) atomic_sub_return(1,(v))
	222	#define atomic64_dec_return(v) atomic64_sub_return(1,(v))
	223
	224	#define atomic_inc_return(v) atomic_add_return(1,(v))
	225	#define atomic64_inc_return(v) atomic64_add_return(1,(v))
	226
	227	#define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
	228	#define atomic64_sub_and_test(i,v) (atomic64_sub_return((i), (v)) == 0)
	229
	230	#define atomic_inc_and_test(v) (atomic_add_return(1, (v)) == 0)
7c72aaf2 HD	231	#define atomic64_inc_and_test(v) (atomic64_add_return(1, (v)) == 0)
7c72aaf2 HD	232
1da177e4 LT	233	#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
	234	#define atomic64_dec_and_test(v) (atomic64_sub_return(1, (v)) == 0)
	235
	236	#define atomic_inc(v) atomic_add(1,(v))
	237	#define atomic64_inc(v) atomic64_add(1,(v))
	238
	239	#define atomic_dec(v) atomic_sub(1,(v))
	240	#define atomic64_dec(v) atomic64_sub(1,(v))
	241
1da177e4	242	#endif /* _ALPHA_ATOMIC_H */