WebSVN – HelenOS-historic – Diff – /kernel/trunk/arch/ia32/include/atomic.h


/*
 * Copyright (C) 2001-2004 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 __ia32_ATOMIC_H__
#define __ia32_ATOMIC_H__
 
#include <arch/types.h>
 
typedef struct { volatile __u32 count; } atomic_t;
 
static inline void atomic_set(atomic_t *val, __u32 i)
{
    val->count = i;
}
 
static inline __u32 atomic_get(atomic_t *val)
{
    return val->count;
}
 
static inline void atomic_inc(atomic_t *val) {
#ifdef CONFIG_SMP
    __asm__ volatile ("lock incl %0\n" : "=m" (val->count));
#else
    __asm__ volatile ("incl %0\n" : "=m" (val->count));
#endif /* CONFIG_SMP */
}
 
static inline void atomic_dec(atomic_t *val) {
#ifdef CONFIG_SMP
    __asm__ volatile ("lock decl %0\n" : "=m" (val->count));
#else
    __asm__ volatile ("decl %0\n" : "=m" (val->count));
#endif /* CONFIG_SMP */
}
 
static inline count_t atomic_inc_pre(atomic_t *val)
{
    count_t r;
 
    __asm__ volatile (
        "movl $1, %0\n"
        "lock xaddl %0, %1\n"
        : "=r" (r), "=m" (val->count)
    );
 
    return r;
}
 
 
 
static inline count_t atomic_dec_pre(atomic_t *val)
{
    count_t r;
   
    __asm__ volatile (
        "movl $-1, %0\n"
        "lock xaddl %0, %1\n"
        : "=r" (r), "=m" (*val)
    );
   
    return r;
}
 
#define atomic_inc_post(val) (atomic_inc_pre(val)+1)
#define atomic_dec_post(val) (atomic_dec_pre(val)-1)
 
static inline int test_and_set(atomic_t *val) {
    int v;
   
    __asm__ volatile (
        "movl $1, %0\n"
        "xchgl %0, %1\n"
        : "=r" (v),"=m" (val->count)
    );
   
    return v;
}
 
 
extern void spinlock_arch(volatile int *val);
 
#endif
 

Rev 625	Rev 627
1	/*	1	/*
2	* Copyright (C) 2001-2004 Jakub Jermar	2	* Copyright (C) 2001-2004 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 __ia32_ATOMIC_H__	29	#ifndef __ia32_ATOMIC_H__
30	#define __ia32_ATOMIC_H__	30	#define __ia32_ATOMIC_H__
31		31
32	#include <arch/types.h>	32	#include <arch/types.h>
33		33
34	typedef struct { volatile __u32 count; } atomic_t;	34	typedef struct { volatile __u32 count; } atomic_t;
35		35
36	static inline void atomic_set(atomic_t *val, __u32 i)	36	static inline void atomic_set(atomic_t *val, __u32 i)
37	{	37	{
38	val->count = i;	38	val->count = i;
39	}	39	}
40		40
41	static inline __u32 atomic_get(atomic_t *val)	41	static inline __u32 atomic_get(atomic_t *val)
42	{	42	{
43	return val->count;	43	return val->count;
44	}	44	}
45		45
46	static inline void atomic_inc(atomic_t *val) {	46	static inline void atomic_inc(atomic_t *val) {
47	#ifdef CONFIG_SMP	47	#ifdef CONFIG_SMP
48	__asm__ volatile ("lock incl %0\n" : "=m" (val->count));	48	__asm__ volatile ("lock incl %0\n" : "=m" (val->count));
49	#else	49	#else
50	__asm__ volatile ("incl %0\n" : "=m" (val->count));	50	__asm__ volatile ("incl %0\n" : "=m" (val->count));
51	#endif /* CONFIG_SMP */	51	#endif /* CONFIG_SMP */
52	}	52	}
53		53
54	static inline void atomic_dec(atomic_t *val) {	54	static inline void atomic_dec(atomic_t *val) {
55	#ifdef CONFIG_SMP	55	#ifdef CONFIG_SMP
56	__asm__ volatile ("lock decl %0\n" : "=m" (val->count));	56	__asm__ volatile ("lock decl %0\n" : "=m" (val->count));
57	#else	57	#else
58	__asm__ volatile ("decl %0\n" : "=m" (val->count));	58	__asm__ volatile ("decl %0\n" : "=m" (val->count));
59	#endif /* CONFIG_SMP */	59	#endif /* CONFIG_SMP */
60	}	60	}
61		61
62	static inline atomic_t atomic_inc_pre(atomic_t *val)	62	static inline count_t atomic_inc_pre(atomic_t *val)
63	{	63	{
64	atomic_t r;	64	count_t r;
-		65
65	__asm__ volatile (	66	__asm__ volatile (
66	"movl $1, %0\n"	67	"movl $1, %0\n"
67	"lock xaddl %0, %1\n"	68	"lock xaddl %0, %1\n"
68	: "=r"(r), "=m" (val->count)	69	: "=r" (r), "=m" (val->count)
69	);	70	);
-		71
70	return r;	72	return r;
71	}	73	}
72		74
73		-
74		-
75	static inline atomic_t atomic_dec_pre(atomic_t *val)	75	static inline count_t atomic_dec_pre(atomic_t *val)
76	{	76	{
77	atomic_t r;	77	count_t r;
-		78
78	__asm__ volatile (	79	__asm__ volatile (
79	"movl $-1, %0\n"	80	"movl $-1, %0\n"
80	"lock xaddl %0, %1\n"	81	"lock xaddl %0, %1\n"
81	: "=r"(r), "=m" (*val)	82	: "=r" (r), "=m" (*val)
82	);	83	);
-		84
83	return r;	85	return r;
84	}	86	}
85		87
86	#define atomic_inc_post(val) (atomic_inc_pre(val)+1)	88	#define atomic_inc_post(val) (atomic_inc_pre(val)+1)
87	#define atomic_dec_post(val) (atomic_dec_pre(val)-1)	89	#define atomic_dec_post(val) (atomic_dec_pre(val)-1)
88		90
89	static inline int test_and_set(atomic_t *val) {	91	static inline int test_and_set(atomic_t *val) {
90	int v;	92	int v;
91		93
92	__asm__ volatile (	94	__asm__ volatile (
93	"movl $1, %0\n"	95	"movl $1, %0\n"
94	"xchgl %0, %1\n"	96	"xchgl %0, %1\n"
95	: "=r" (v),"=m" (val->count)	97	: "=r" (v),"=m" (val->count)
96	);	98	);
97		99
98	return v;	100	return v;
99	}	101	}
100		102
101		103
102	extern void spinlock_arch(volatile int *val);	104	extern void spinlock_arch(volatile int *val);
103		105
104	#endif	106	#endif
105		107

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/ia32/include/atomic.h – Rev 625 → 627