WebSVN – HelenOS – Diff – /tags/0.2.0.1/kernel/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.
 */
 
#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)
{
    __u64 a, b;
    volatile __u64 x = (__u64) &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" (*((__u64 *)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
 

Subversion Repositories HelenOS

(root)/tags/0.2.0.1/kernel/arch/sparc64/include/atomic.h – Rev 1965 → 1968

Rev 1965		Rev 1968
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	#ifndef __sparc64_ATOMIC_H__	29	#ifndef __sparc64_ATOMIC_H__
30	#define __sparc64_ATOMIC_H__	30	#define __sparc64_ATOMIC_H__
31		31
32	#include <arch/types.h>	32	#include <arch/types.h>
33	#include <typedefs.h>	33	#include <typedefs.h>
34		34
35	/** Atomic add operation.	35	/** Atomic add operation.
36	*	36	*
37	* Use atomic compare and swap operation to atomically add signed value.	37	* Use atomic compare and swap operation to atomically add signed value.
38	*	38	*
39	* @param val Atomic variable.	39	* @param val Atomic variable.
40	* @param i Signed value to be added.	40	* @param i Signed value to be added.
41	*	41	*
42	* @return Value of the atomic variable as it existed before addition.	42	* @return Value of the atomic variable as it existed before addition.
43	*/	43	*/
44	static inline long atomic_add(atomic_t *val, int i)	44	static inline long atomic_add(atomic_t *val, int i)
45	{	45	{
46	__u64 a, b;	46	__u64 a, b;
47	volatile __u64 x = (__u64) &val->count;	47	volatile __u64 x = (__u64) &val->count;
48		48
49	__asm__ volatile (	49	__asm__ volatile (
50	"0:\n"	50	"0:\n"
51	"ldx %0, %1\n"	51	"ldx %0, %1\n"
52	"add %1, %3, %2\n"	52	"add %1, %3, %2\n"
53	"casx %0, %1, %2\n"	53	"casx %0, %1, %2\n"
54	"cmp %1, %2\n"	54	"cmp %1, %2\n"
55	"bne 0b\n" /* The operation failed and must be attempted again if a != b. */	55	"bne 0b\n" /* The operation failed and must be attempted again if a != b. */
56	"nop\n"	56	"nop\n"
57	: "=m" (((__u64 )x)), "=r" (a), "=r" (b)	57	: "=m" (((__u64 )x)), "=r" (a), "=r" (b)
58	: "r" (i)	58	: "r" (i)
59	);	59	);
60		60
61	return a;	61	return a;
62	}	62	}
63		63
64	static inline long atomic_preinc(atomic_t *val)	64	static inline long atomic_preinc(atomic_t *val)
65	{	65	{
66	return atomic_add(val, 1) + 1;	66	return atomic_add(val, 1) + 1;
67	}	67	}
68		68
69	static inline long atomic_postinc(atomic_t *val)	69	static inline long atomic_postinc(atomic_t *val)
70	{	70	{
71	return atomic_add(val, 1);	71	return atomic_add(val, 1);
72	}	72	}
73		73
74	static inline long atomic_predec(atomic_t *val)	74	static inline long atomic_predec(atomic_t *val)
75	{	75	{
76	return atomic_add(val, -1) - 1;	76	return atomic_add(val, -1) - 1;
77	}	77	}
78		78
79	static inline long atomic_postdec(atomic_t *val)	79	static inline long atomic_postdec(atomic_t *val)
80	{	80	{
81	return atomic_add(val, -1);	81	return atomic_add(val, -1);
82	}	82	}
83		83
84	static inline void atomic_inc(atomic_t *val)	84	static inline void atomic_inc(atomic_t *val)
85	{	85	{
86	(void) atomic_add(val, 1);	86	(void) atomic_add(val, 1);
87	}	87	}
88		88
89	static inline void atomic_dec(atomic_t *val)	89	static inline void atomic_dec(atomic_t *val)
90	{	90	{
91	(void) atomic_add(val, -1);	91	(void) atomic_add(val, -1);
92	}	92	}
93		93
94	#endif	94	#endif
95		95