WebSVN – HelenOS-historic – Diff – /kernel/trunk/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 sparc64
 * @{
 */
/** @file
 */
 
#ifndef __sparc64_ATOMIC_H__
#define __sparc64_ATOMIC_H__
 
#include <arch/types.h>
#include <typedefs.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;
    volatile uint64_t x = (uint64_t) &val->count;
 
    __asm__ volatile (
        "0:\n"
        "ldx %0, %1\n"
        "add %1, %3, %2\n"
        "casx %0, %1, %2\n"
        "cmp %1, %2\n"
        "bne 0b\n"      /* The operation failed and must be attempted again if a != b. */
        "nop\n"
        : "=m" (*((uint64_t *)x)), "=r" (a), "=r" (b)
        : "r" (i)
    );
 
    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
 
/** @}
 */
 
 

Rev 1780	Rev 1784
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 sparc64	29	/** @addtogroup sparc64
30	* @{	30	* @{
31	*/	31	*/
32	/** @file	32	/** @file
33	*/	33	*/
34		34
35	#ifndef __sparc64_ATOMIC_H__	35	#ifndef __sparc64_ATOMIC_H__
36	#define __sparc64_ATOMIC_H__	36	#define __sparc64_ATOMIC_H__
37		37
38	#include <arch/types.h>	38	#include <arch/types.h>
39	#include <typedefs.h>	39	#include <typedefs.h>
40		40
41	/** Atomic add operation.	41	/** Atomic add operation.
42	*	42	*
43	* Use atomic compare and swap operation to atomically add signed value.	43	* Use atomic compare and swap operation to atomically add signed value.
44	*	44	*
45	* @param val Atomic variable.	45	* @param val Atomic variable.
46	* @param i Signed value to be added.	46	* @param i Signed value to be added.
47	*	47	*
48	* @return Value of the atomic variable as it existed before addition.	48	* @return Value of the atomic variable as it existed before addition.
49	*/	49	*/
50	static inline long atomic_add(atomic_t *val, int i)	50	static inline long atomic_add(atomic_t *val, int i)
51	{	51	{
52	uint64_t a, b;	52	uint64_t a, b;
53	volatile uint64_t x = (uint64_t) &val->count;	53	volatile uint64_t x = (uint64_t) &val->count;
54		54
55	__asm__ volatile (	55	__asm__ volatile (
56	"0:\n"	56	"0:\n"
57	"ldx %0, %1\n"	57	"ldx %0, %1\n"
58	"add %1, %3, %2\n"	58	"add %1, %3, %2\n"
59	"casx %0, %1, %2\n"	59	"casx %0, %1, %2\n"
60	"cmp %1, %2\n"	60	"cmp %1, %2\n"
61	"bne 0b\n" /* The operation failed and must be attempted again if a != b. */	61	"bne 0b\n" /* The operation failed and must be attempted again if a != b. */
62	"nop\n"	62	"nop\n"
63	: "=m" (((uint64_t )x)), "=r" (a), "=r" (b)	63	: "=m" (((uint64_t )x)), "=r" (a), "=r" (b)
64	: "r" (i)	64	: "r" (i)
65	);	65	);
66		66
67	return a;	67	return a;
68	}	68	}
69		69
70	static inline long atomic_preinc(atomic_t *val)	70	static inline long atomic_preinc(atomic_t *val)
71	{	71	{
72	return atomic_add(val, 1) + 1;	72	return atomic_add(val, 1) + 1;
73	}	73	}
74		74
75	static inline long atomic_postinc(atomic_t *val)	75	static inline long atomic_postinc(atomic_t *val)
76	{	76	{
77	return atomic_add(val, 1);	77	return atomic_add(val, 1);
78	}	78	}
79		79
80	static inline long atomic_predec(atomic_t *val)	80	static inline long atomic_predec(atomic_t *val)
81	{	81	{
82	return atomic_add(val, -1) - 1;	82	return atomic_add(val, -1) - 1;
83	}	83	}
84		84
85	static inline long atomic_postdec(atomic_t *val)	85	static inline long atomic_postdec(atomic_t *val)
86	{	86	{
87	return atomic_add(val, -1);	87	return atomic_add(val, -1);
88	}	88	}
89		89
90	static inline void atomic_inc(atomic_t *val)	90	static inline void atomic_inc(atomic_t *val)
91	{	91	{
92	(void) atomic_add(val, 1);	92	(void) atomic_add(val, 1);
93	}	93	}
94		94
95	static inline void atomic_dec(atomic_t *val)	95	static inline void atomic_dec(atomic_t *val)
96	{	96	{
97	(void) atomic_add(val, -1);	97	(void) atomic_add(val, -1);
98	}	98	}
99		99
100	#endif	100	#endif
101		101
102	/** @}	102	/** @}
103	*/	103	*/
104		-
105		104

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/sparc64/include/atomic.h – Rev 1780 → 1784