WebSVN – HelenOS – Diff – /branches/rcu/uspace/libc/arch/sparc64/include/atomic.h


/*
 * Copyright (c) 2005 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/** @addtogroup libcsparc64
 * @{
 */
/** @file
 */
 
#ifndef LIBC_sparc64_ATOMIC_H_
#define LIBC_sparc64_ATOMIC_H_
 
#include <types.h>
 
/** Atomic add operation.
 *
 * Use atomic compare and swap operation to atomically add signed value.
 *
 * @param val Atomic variable.
 * @param i Signed value to be added.
 *
 * @return Value of the atomic variable as it existed before addition.
 */
static inline long atomic_add(atomic_t *val, int i)
{
    uint64_t a, b;
 
    do {
        volatile uintptr_t x = (uint64_t) &val->count;
 
        a = *((uint64_t *) x);
        b = a + i;
        asm volatile ("casx %0, %2, %1\n" : "+m" (*((uint64_t *)x)), "+r" (b) : "r" (a));
    } while (a != b);
 
    return a;
}
 
static inline long atomic_preinc(atomic_t *val)
{
    return atomic_add(val, 1) + 1;
}
 
static inline long atomic_postinc(atomic_t *val)
{
    return atomic_add(val, 1);
}
 
static inline long atomic_predec(atomic_t *val)
{
    return atomic_add(val, -1) - 1;
}
 
static inline long atomic_postdec(atomic_t *val)
{
    return atomic_add(val, -1);
}
 
static inline void atomic_inc(atomic_t *val)
{
    (void) atomic_add(val, 1);
}
 
static inline void atomic_dec(atomic_t *val)
{
    (void) atomic_add(val, -1);
}
 
#endif
 
/** @}
 */
 

Subversion Repositories HelenOS

(root)/branches/rcu/uspace/libc/arch/sparc64/include/atomic.h – Rev 2131 → 2307

Rev 2131		Rev 2307
1	/*	1	/*
2	* Copyright (c) 2005 Jakub Jermar	2	* Copyright (c) 2005 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/** @addtogroup libcsparc64	29	/** @addtogroup libcsparc64
30	* @{	30	* @{
31	*/	31	*/
32	/** @file	32	/** @file
33	*/	33	*/
34		34
35	#ifndef LIBC_sparc64_ATOMIC_H_	35	#ifndef LIBC_sparc64_ATOMIC_H_
36	#define LIBC_sparc64_ATOMIC_H_	36	#define LIBC_sparc64_ATOMIC_H_
37		37
38	#include <types.h>	38	#include <types.h>
39		39
40	/** Atomic add operation.	40	/** Atomic add operation.
41	*	41	*
42	* Use atomic compare and swap operation to atomically add signed value.	42	* Use atomic compare and swap operation to atomically add signed value.
43	*	43	*
44	* @param val Atomic variable.	44	* @param val Atomic variable.
45	* @param i Signed value to be added.	45	* @param i Signed value to be added.
46	*	46	*
47	* @return Value of the atomic variable as it existed before addition.	47	* @return Value of the atomic variable as it existed before addition.
48	*/	48	*/
49	static inline long atomic_add(atomic_t *val, int i)	49	static inline long atomic_add(atomic_t *val, int i)
50	{	50	{
51	uint64_t a, b;	51	uint64_t a, b;
52		52
53	do {	53	do {
-		54	volatile uintptr_t x = (uint64_t) &val->count;
-		55
54	a = val->count;	56	a = ((uint64_t ) x);
55	b = a + i;	57	b = a + i;
56	asm volatile ("casx %0, %2, %1\n" : "+m" (*val), "+r" (b) : "r" (a));	58	asm volatile ("casx %0, %2, %1\n" : "+m" (((uint64_t )x)), "+r" (b) : "r" (a));
57	} while (a != b);	59	} while (a != b);
58		60
59	return a;	61	return a;
60	}	62	}
61		63
62	static inline long atomic_preinc(atomic_t *val)	64	static inline long atomic_preinc(atomic_t *val)
63	{	65	{
64	return atomic_add(val, 1) + 1;	66	return atomic_add(val, 1) + 1;
65	}	67	}
66		68
67	static inline long atomic_postinc(atomic_t *val)	69	static inline long atomic_postinc(atomic_t *val)
68	{	70	{
69	return atomic_add(val, 1);	71	return atomic_add(val, 1);
70	}	72	}
71		73
72	static inline long atomic_predec(atomic_t *val)	74	static inline long atomic_predec(atomic_t *val)
73	{	75	{
74	return atomic_add(val, -1) - 1;	76	return atomic_add(val, -1) - 1;
75	}	77	}
76		78
77	static inline long atomic_postdec(atomic_t *val)	79	static inline long atomic_postdec(atomic_t *val)
78	{	80	{
79	return atomic_add(val, -1);	81	return atomic_add(val, -1);
80	}	82	}
81		83
82	static inline void atomic_inc(atomic_t *val)	84	static inline void atomic_inc(atomic_t *val)
83	{	85	{
84	(void) atomic_add(val, 1);	86	(void) atomic_add(val, 1);
85	}	87	}
86		88
87	static inline void atomic_dec(atomic_t *val)	89	static inline void atomic_dec(atomic_t *val)
88	{	90	{
89	(void) atomic_add(val, -1);	91	(void) atomic_add(val, -1);
90	}	92	}
91		93
92	#endif	94	#endif
93		95
94	/** @}	96	/** @}
95	*/	97	*/
96		98