[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / asm-cris / atomic.h

/* $Id: atomic.h,v 1.3 2001/07/25 16:15:19 bjornw Exp $ */

#ifndef __ASM_CRIS_ATOMIC__
#define __ASM_CRIS_ATOMIC__

#include <asm/system.h>

/*
 * Atomic operations that C can't guarantee us.  Useful for
 * resource counting etc..
 */

/*
 * Make sure gcc doesn't try to be clever and move things around
 * on us. We need to use _exactly_ the address the user gave us,
 * not some alias that contains the same information.
 */

#define __atomic_fool_gcc(x) (*(struct { int a[100]; } *)x)

typedef struct { int counter; } atomic_t;

#define ATOMIC_INIT(i)  { (i) }

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

/* These should be written in asm but we do it in C for now. */

extern __inline__ void atomic_add(int i, volatile atomic_t *v)
{
	unsigned long flags;
	local_save_flags(flags);
	local_irq_disable();
	v->counter += i;
	local_irq_restore(flags);
}

extern __inline__ void atomic_sub(int i, volatile atomic_t *v)
{
	unsigned long flags;
	local_save_flags(flags);
	local_irq_disable();
	v->counter -= i;
	local_irq_restore(flags);
}

extern __inline__ int atomic_add_return(int i, volatile atomic_t *v)
{
	unsigned long flags;
	int retval;
	local_save_flags(flags);
	local_irq_disable();
	retval = (v->counter += i);
	local_irq_restore(flags);
	return retval;
}

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

extern __inline__ int atomic_sub_return(int i, volatile atomic_t *v)
{
	unsigned long flags;
	int retval;
	local_save_flags(flags);
	local_irq_disable();
	retval = (v->counter -= i);
	local_irq_restore(flags);
	return retval;
}

extern __inline__ int atomic_sub_and_test(int i, volatile atomic_t *v)
{
	int retval;
	unsigned long flags;
	local_save_flags(flags);
	local_irq_disable();
	retval = (v->counter -= i) == 0;
	local_irq_restore(flags);
	return retval;
}

extern __inline__ void atomic_inc(volatile atomic_t *v)
{
	unsigned long flags;
	local_save_flags(flags);
	local_irq_disable();
	(v->counter)++;
	local_irq_restore(flags);
}

extern __inline__ void atomic_dec(volatile atomic_t *v)
{
	unsigned long flags;
	local_save_flags(flags);
	local_irq_disable();
	(v->counter)--;
	local_irq_restore(flags);
}

extern __inline__ int atomic_inc_return(volatile atomic_t *v)
{
	unsigned long flags;
	int retval;
	local_save_flags(flags);
	local_irq_disable();
	retval = (v->counter)++;
	local_irq_restore(flags);
	return retval;
}

extern __inline__ int atomic_dec_return(volatile atomic_t *v)
{
	unsigned long flags;
	int retval;
	local_save_flags(flags);
	local_irq_disable();
	retval = (v->counter)--;
	local_irq_restore(flags);
	return retval;
}
extern __inline__ int atomic_dec_and_test(volatile atomic_t *v)
{
	int retval;
	unsigned long flags;
	local_save_flags(flags);
	local_irq_disable();
	retval = --(v->counter) == 0;
	local_irq_restore(flags);
	return retval;
}

extern __inline__ int atomic_inc_and_test(volatile atomic_t *v)
{
	int retval;
	unsigned long flags;
	local_save_flags(flags);
	local_irq_disable();
	retval = ++(v->counter) == 0;
	local_irq_restore(flags);
	return retval;
}

/* 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()

#endif
Commit	Line	Data
1da177e4 LT	1	/* $Id: atomic.h,v 1.3 2001/07/25 16:15:19 bjornw Exp $ */
	2
	3	#ifndef __ASM_CRIS_ATOMIC__
	4	#define __ASM_CRIS_ATOMIC__
	5
	6	#include <asm/system.h>
	7
	8	/*
	9	* Atomic operations that C can't guarantee us. Useful for
	10	* resource counting etc..
	11	*/
	12
	13	/*
	14	* Make sure gcc doesn't try to be clever and move things around
	15	* on us. We need to use _exactly_ the address the user gave us,
	16	* not some alias that contains the same information.
	17	*/
	18
	19	#define __atomic_fool_gcc(x) ((struct { int a[100]; } )x)
	20
	21	typedef struct { int counter; } atomic_t;
	22
	23	#define ATOMIC_INIT(i) { (i) }
	24
	25	#define atomic_read(v) ((v)->counter)
	26	#define atomic_set(v,i) (((v)->counter) = (i))
	27
	28	/* These should be written in asm but we do it in C for now. */
	29
	30	extern __inline__ void atomic_add(int i, volatile atomic_t *v)
	31	{
	32	unsigned long flags;
	33	local_save_flags(flags);
	34	local_irq_disable();
	35	v->counter += i;
	36	local_irq_restore(flags);
	37	}
	38
	39	extern __inline__ void atomic_sub(int i, volatile atomic_t *v)
	40	{
	41	unsigned long flags;
	42	local_save_flags(flags);
	43	local_irq_disable();
	44	v->counter -= i;
	45	local_irq_restore(flags);
	46	}
	47
	48	extern __inline__ int atomic_add_return(int i, volatile atomic_t *v)
	49	{
	50	unsigned long flags;
	51	int retval;
	52	local_save_flags(flags);
	53	local_irq_disable();
	54	retval = (v->counter += i);
	55	local_irq_restore(flags);
	56	return retval;
	57	}
	58
	59	#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
	60
	61	extern __inline__ int atomic_sub_return(int i, volatile atomic_t *v)
	62	{
	63	unsigned long flags;
	64	int retval;
65	local_save_flags(flags);
66	local_irq_disable();
67	retval = (v->counter -= i);
68	local_irq_restore(flags);
69	return retval;
70	}
71
72	extern __inline__ int atomic_sub_and_test(int i, volatile atomic_t *v)
73	{
74	int retval;
75	unsigned long flags;
76	local_save_flags(flags);
77	local_irq_disable();
78	retval = (v->counter -= i) == 0;
79	local_irq_restore(flags);
80	return retval;
81	}
82
83	extern __inline__ void atomic_inc(volatile atomic_t *v)
84	{
85	unsigned long flags;
86	local_save_flags(flags);
87	local_irq_disable();
88	(v->counter)++;
89	local_irq_restore(flags);
90	}
91
92	extern __inline__ void atomic_dec(volatile atomic_t *v)
93	{
94	unsigned long flags;
95	local_save_flags(flags);
96	local_irq_disable();
97	(v->counter)--;
98	local_irq_restore(flags);
99	}
100
101	extern __inline__ int atomic_inc_return(volatile atomic_t *v)
102	{
103	unsigned long flags;
104	int retval;
105	local_save_flags(flags);
106	local_irq_disable();
107	retval = (v->counter)++;
108	local_irq_restore(flags);
109	return retval;
110	}
111
112	extern __inline__ int atomic_dec_return(volatile atomic_t *v)
113	{
114	unsigned long flags;
115	int retval;
116	local_save_flags(flags);
117	local_irq_disable();
118	retval = (v->counter)--;
119	local_irq_restore(flags);
120	return retval;
121	}
122	extern __inline__ int atomic_dec_and_test(volatile atomic_t *v)
123	{
124	int retval;
125	unsigned long flags;
126	local_save_flags(flags);
127	local_irq_disable();
128	retval = --(v->counter) == 0;
129	local_irq_restore(flags);
130	return retval;
131	}
132
133	extern __inline__ int atomic_inc_and_test(volatile atomic_t *v)
134	{
135	int retval;
136	unsigned long flags;
137	local_save_flags(flags);
138	local_irq_disable();
139	retval = ++(v->counter) == 0;
140	local_irq_restore(flags);
141	return retval;
142	}
143
144	/* Atomic operations are already serializing */
145	#define smp_mb__before_atomic_dec() barrier()
146	#define smp_mb__after_atomic_dec() barrier()
147	#define smp_mb__before_atomic_inc() barrier()
148	#define smp_mb__after_atomic_inc() barrier()
149
150	#endif