[linux-2.6-block.git] / arch / openrisc / include / asm / atomic.h

/*
 * Copyright (C) 2014 Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2.  This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 */

#ifndef __ASM_OPENRISC_ATOMIC_H
#define __ASM_OPENRISC_ATOMIC_H

#include <linux/types.h>

/* Atomically perform op with v->counter and i */
#define ATOMIC_OP(op)							\
static inline void atomic_##op(int i, atomic_t *v)			\
{									\
	int tmp;							\
									\
	__asm__ __volatile__(						\
		"1:	l.lwa	%0,0(%1)	\n"			\
		"	l." #op " %0,%0,%2	\n"			\
		"	l.swa	0(%1),%0	\n"			\
		"	l.bnf	1b		\n"			\
		"	 l.nop			\n"			\
		: "=&r"(tmp)						\
		: "r"(&v->counter), "r"(i)				\
		: "cc", "memory");					\
}

/* Atomically perform op with v->counter and i, return the result */
#define ATOMIC_OP_RETURN(op)						\
static inline int atomic_##op##_return(int i, atomic_t *v)		\
{									\
	int tmp;							\
									\
	__asm__ __volatile__(						\
		"1:	l.lwa	%0,0(%1)	\n"			\
		"	l." #op " %0,%0,%2	\n"			\
		"	l.swa	0(%1),%0	\n"			\
		"	l.bnf	1b		\n"			\
		"	 l.nop			\n"			\
		: "=&r"(tmp)						\
		: "r"(&v->counter), "r"(i)				\
		: "cc", "memory");					\
									\
	return tmp;							\
}

/* Atomically perform op with v->counter and i, return orig v->counter */
#define ATOMIC_FETCH_OP(op)						\
static inline int atomic_fetch_##op(int i, atomic_t *v)			\
{									\
	int tmp, old;							\
									\
	__asm__ __volatile__(						\
		"1:	l.lwa	%0,0(%2)	\n"			\
		"	l." #op " %1,%0,%3	\n"			\
		"	l.swa	0(%2),%1	\n"			\
		"	l.bnf	1b		\n"			\
		"	 l.nop			\n"			\
		: "=&r"(old), "=&r"(tmp)				\
		: "r"(&v->counter), "r"(i)				\
		: "cc", "memory");					\
									\
	return old;							\
}

ATOMIC_OP_RETURN(add)
ATOMIC_OP_RETURN(sub)

ATOMIC_FETCH_OP(add)
ATOMIC_FETCH_OP(sub)
ATOMIC_FETCH_OP(and)
ATOMIC_FETCH_OP(or)
ATOMIC_FETCH_OP(xor)

ATOMIC_OP(and)
ATOMIC_OP(or)
ATOMIC_OP(xor)

#undef ATOMIC_FETCH_OP
#undef ATOMIC_OP_RETURN
#undef ATOMIC_OP

#define atomic_add_return	atomic_add_return
#define atomic_sub_return	atomic_sub_return
#define atomic_fetch_add	atomic_fetch_add
#define atomic_fetch_sub	atomic_fetch_sub
#define atomic_fetch_and	atomic_fetch_and
#define atomic_fetch_or		atomic_fetch_or
#define atomic_fetch_xor	atomic_fetch_xor
#define atomic_and	atomic_and
#define atomic_or	atomic_or
#define atomic_xor	atomic_xor

/*
 * Atomically add a to v->counter as long as v is not already u.
 * Returns the original value at v->counter.
 *
 * This is often used through atomic_inc_not_zero()
 */
static inline int atomic_fetch_add_unless(atomic_t *v, int a, int u)
{
	int old, tmp;

	__asm__ __volatile__(
		"1:	l.lwa %0, 0(%2)		\n"
		"	l.sfeq %0, %4		\n"
		"	l.bf 2f			\n"
		"	 l.add %1, %0, %3	\n"
		"	l.swa 0(%2), %1		\n"
		"	l.bnf 1b		\n"
		"	 l.nop			\n"
		"2:				\n"
		: "=&r"(old), "=&r" (tmp)
		: "r"(&v->counter), "r"(a), "r"(u)
		: "cc", "memory");

	return old;
}
#define atomic_fetch_add_unless	atomic_fetch_add_unless

#include <asm-generic/atomic.h>

#endif /* __ASM_OPENRISC_ATOMIC_H */
Commit	Line	Data
bc19598f SK	1	/*
	2	* Copyright (C) 2014 Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
	3	*
	4	* This file is licensed under the terms of the GNU General Public License
	5	* version 2. This program is licensed "as is" without any warranty of any
	6	* kind, whether express or implied.
	7	*/
	8
	9	#ifndef __ASM_OPENRISC_ATOMIC_H
	10	#define __ASM_OPENRISC_ATOMIC_H
	11
	12	#include <linux/types.h>
	13
	14	/* Atomically perform op with v->counter and i */
	15	#define ATOMIC_OP(op) \
	16	static inline void atomic_##op(int i, atomic_t *v) \
	17	{ \
	18	int tmp; \
	19	\
	20	__asm__ __volatile__( \
	21	"1: l.lwa %0,0(%1) \n" \
	22	" l." #op " %0,%0,%2 \n" \
	23	" l.swa 0(%1),%0 \n" \
	24	" l.bnf 1b \n" \
	25	" l.nop \n" \
	26	: "=&r"(tmp) \
	27	: "r"(&v->counter), "r"(i) \
	28	: "cc", "memory"); \
	29	}
	30
	31	/* Atomically perform op with v->counter and i, return the result */
	32	#define ATOMIC_OP_RETURN(op) \
	33	static inline int atomic_##op##_return(int i, atomic_t *v) \
	34	{ \
	35	int tmp; \
	36	\
	37	__asm__ __volatile__( \
	38	"1: l.lwa %0,0(%1) \n" \
	39	" l." #op " %0,%0,%2 \n" \
	40	" l.swa 0(%1),%0 \n" \
	41	" l.bnf 1b \n" \
	42	" l.nop \n" \
	43	: "=&r"(tmp) \
	44	: "r"(&v->counter), "r"(i) \
	45	: "cc", "memory"); \
	46	\
	47	return tmp; \
	48	}
	49
	50	/* Atomically perform op with v->counter and i, return orig v->counter */
	51	#define ATOMIC_FETCH_OP(op) \
	52	static inline int atomic_fetch_##op(int i, atomic_t *v) \
	53	{ \
	54	int tmp, old; \
	55	\
	56	__asm__ __volatile__( \
	57	"1: l.lwa %0,0(%2) \n" \
	58	" l." #op " %1,%0,%3 \n" \
	59	" l.swa 0(%2),%1 \n" \
	60	" l.bnf 1b \n" \
	61	" l.nop \n" \
	62	: "=&r"(old), "=&r"(tmp) \
	63	: "r"(&v->counter), "r"(i) \
	64	: "cc", "memory"); \
65	\
66	return old; \
67	}
68
69	ATOMIC_OP_RETURN(add)
70	ATOMIC_OP_RETURN(sub)
71
72	ATOMIC_FETCH_OP(add)
73	ATOMIC_FETCH_OP(sub)
74	ATOMIC_FETCH_OP(and)
75	ATOMIC_FETCH_OP(or)
76	ATOMIC_FETCH_OP(xor)
77
78	ATOMIC_OP(and)
79	ATOMIC_OP(or)
80	ATOMIC_OP(xor)
81
82	#undef ATOMIC_FETCH_OP
83	#undef ATOMIC_OP_RETURN
84	#undef ATOMIC_OP
85
86	#define atomic_add_return atomic_add_return
87	#define atomic_sub_return atomic_sub_return
88	#define atomic_fetch_add atomic_fetch_add
89	#define atomic_fetch_sub atomic_fetch_sub
90	#define atomic_fetch_and atomic_fetch_and
91	#define atomic_fetch_or atomic_fetch_or
92	#define atomic_fetch_xor atomic_fetch_xor
93	#define atomic_and atomic_and
94	#define atomic_or atomic_or
95	#define atomic_xor atomic_xor
96
97	/*
98	* Atomically add a to v->counter as long as v is not already u.
99	* Returns the original value at v->counter.
100	*
101	* This is often used through atomic_inc_not_zero()
102	*/
bfc18e38	103	static inline int atomic_fetch_add_unless(atomic_t *v, int a, int u)
bc19598f SK	104	{
	105	int old, tmp;
	106
	107	__asm__ __volatile__(
	108	"1: l.lwa %0, 0(%2) \n"
	109	" l.sfeq %0, %4 \n"
	110	" l.bf 2f \n"
	111	" l.add %1, %0, %3 \n"
	112	" l.swa 0(%2), %1 \n"
	113	" l.bnf 1b \n"
	114	" l.nop \n"
	115	"2: \n"
	116	: "=&r"(old), "=&r" (tmp)
	117	: "r"(&v->counter), "r"(a), "r"(u)
	118	: "cc", "memory");
	119
	120	return old;
	121	}
bfc18e38	122	#define atomic_fetch_add_unless atomic_fetch_add_unless
bc19598f SK	123
	124	#include <asm-generic/atomic.h>
	125
	126	#endif /* __ASM_OPENRISC_ATOMIC_H */