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.
 */
 
#ifndef __sparc64_ATOMIC_H__
#define __sparc64_ATOMIC_H__
 
#include <arch/types.h>
 
typedef struct { volatile __u64 count; } atomic_t;
 
/** 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 count_t 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 void atomic_inc(atomic_t *val)
{
    (void) atomic_add(val, 1);
}
 
static inline void atomic_dec(atomic_t *val)
{
    (void) atomic_add(val, -1);
}
 
static inline void atomic_set(atomic_t *val, __u64 i)
{
    val->count = i;
}
 
static inline __u64 atomic_get(atomic_t *val)
{
    return val->count;
}
 
#endif
 

Rev 861	Rev 863
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		33
34	typedef struct { volatile __u64 count; } atomic_t;	34	typedef struct { volatile __u64 count; } atomic_t;
35		35
36	/** Atomic add operation.	36	/** Atomic add operation.
37	*	37	*
38	* Use atomic compare and swap operation to atomically add signed value.	38	* Use atomic compare and swap operation to atomically add signed value.
39	*	39	*
40	* @param val Atomic variable.	40	* @param val Atomic variable.
41	* @param i Signed value to be added.	41	* @param i Signed value to be added.
42	*	42	*
43	* @return Value of the atomic variable as it existed before addition.	43	* @return Value of the atomic variable as it existed before addition.
44	*/	44	*/
45	static inline count_t atomic_add(atomic_t *val, int i)	45	static inline count_t atomic_add(atomic_t *val, int i)
46	{	46	{
47	__u64 a, b;	47	__u64 a, b;
48	volatile __u64 x = (__u64) &val->count;	48	volatile __u64 x = (__u64) &val->count;
49		49
50	__asm__ volatile (	50	__asm__ volatile (
51	"0:\n"	51	"0:\n"
52	"ldx %0, %1\n"	52	"ldx %0, %1\n"
53	"add %1, %3, %2\n"	53	"add %1, %3, %2\n"
54	"casx %0, %1, %2\n"	54	"casx %0, %1, %2\n"
55	"cmp %1, %2\n"	55	"cmp %1, %2\n"
56	"bne 0b\n"	56	"bne 0b\n" /* The operation failed and must be attempted again if a != b. */
57	"nop\n"	57	"nop\n"
58	: "=m" (((__u64 )x)), "=r" (a), "=r" (b)	58	: "=m" (((__u64 )x)), "=r" (a), "=r" (b)
59	: "r" (i)	59	: "r" (i)
60	);	60	);
61		61
62	return a;	62	return a;
63	}	63	}
64		64
65	static inline void atomic_inc(atomic_t *val)	65	static inline void atomic_inc(atomic_t *val)
66	{	66	{
67	(void) atomic_add(val, 1);	67	(void) atomic_add(val, 1);
68	}	68	}
69		69
70	static inline void atomic_dec(atomic_t *val)	70	static inline void atomic_dec(atomic_t *val)
71	{	71	{
72	(void) atomic_add(val, -1);	72	(void) atomic_add(val, -1);
73	}	73	}
74		74
75	static inline void atomic_set(atomic_t *val, __u64 i)	75	static inline void atomic_set(atomic_t *val, __u64 i)
76	{	76	{
77	val->count = i;	77	val->count = i;
78	}	78	}
79		79
80	static inline __u64 atomic_get(atomic_t *val)	80	static inline __u64 atomic_get(atomic_t *val)
81	{	81	{
82	return val->count;	82	return val->count;
83	}	83	}
84		84
85	#endif	85	#endif
86		86

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/sparc64/include/atomic.h – Rev 861 → 863