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 volatile __u32 atomic_t;
 
static inline void atomic_inc(atomic_t *val) {
#ifdef CONFIG_SMP
    __asm__ volatile ("lock incl %0\n" : "=m" (*val));
#else
    __asm__ volatile ("incl %0\n" : "=m" (*val));
#endif /* CONFIG_SMP */
}
 
static inline void atomic_dec(atomic_t *val) {
#ifdef CONFIG_SMP
    __asm__ volatile ("lock decl %0\n" : "=m" (*val));
#else
    __asm__ volatile ("decl %0\n" : "=m" (*val));
#endif /* CONFIG_SMP */
}
 
static inline atomic_t atomic_inc_pre(atomic_t *val)
{
    atomic_t r;
    __asm__ volatile (
        "movl $1, %0\n"
        "lock xaddl %0, %1\n"
        : "=r"(r), "=m" (*val)
    );
    return r;
}
 
 
 
static inline atomic_t atomic_dec_pre(atomic_t *val)
{
    atomic_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(volatile int *val) {
    int v;
   
    __asm__ volatile (
        "movl $1, %0\n"
        "xchgl %0, %1\n"
        : "=r" (v),"=m" (*val)
    );
   
    return v;
}
 
 
extern void spinlock_arch(volatile int *val);
 
#endif
 

Rev 534	Rev 557
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 volatile __u32 atomic_t;	34	typedef volatile __u32 atomic_t;
35		35
36	static inline void atomic_inc(atomic_t *val) {	36	static inline void atomic_inc(atomic_t *val) {
37	#ifdef CONFIG_SMP	37	#ifdef CONFIG_SMP
38	__asm__ volatile ("lock incl %0\n" : "=m" (*val));	38	__asm__ volatile ("lock incl %0\n" : "=m" (*val));
39	#else	39	#else
40	__asm__ volatile ("incl %0\n" : "=m" (*val));	40	__asm__ volatile ("incl %0\n" : "=m" (*val));
41	#endif /* CONFIG_SMP */	41	#endif /* CONFIG_SMP */
42	}	42	}
43		43
44	static inline void atomic_dec(atomic_t *val) {	44	static inline void atomic_dec(atomic_t *val) {
45	#ifdef CONFIG_SMP	45	#ifdef CONFIG_SMP
46	__asm__ volatile ("lock decl %0\n" : "=m" (*val));	46	__asm__ volatile ("lock decl %0\n" : "=m" (*val));
47	#else	47	#else
48	__asm__ volatile ("decl %0\n" : "=m" (*val));	48	__asm__ volatile ("decl %0\n" : "=m" (*val));
49	#endif /* CONFIG_SMP */	49	#endif /* CONFIG_SMP */
50	}	50	}
51		51
52	static inline atomic_t atomic_inc_pre(atomic_t *val)	52	static inline atomic_t atomic_inc_pre(atomic_t *val)
53	{	53	{
54	atomic_t r;	54	atomic_t r;
55	__asm__ volatile (	55	__asm__ volatile (
56	"movl $1,%0;"	56	"movl $1, %0\n"
57	"lock xaddl %0,%1;"	57	"lock xaddl %0, %1\n"
58	: "=r"(r), "=m" (*val)	58	: "=r"(r), "=m" (*val)
59	);	59	);
60	return r;	60	return r;
61	}	61	}
62		62
63		63
64		64
65	static inline atomic_t atomic_dec_pre(atomic_t *val)	65	static inline atomic_t atomic_dec_pre(atomic_t *val)
66	{	66	{
67	atomic_t r;	67	atomic_t r;
68	__asm__ volatile (	68	__asm__ volatile (
69	"movl $-1,%0;"	69	"movl $-1, %0\n"
70	"lock xaddl %0,%1;"	70	"lock xaddl %0, %1\n"
71	: "=r"(r), "=m" (*val)	71	: "=r"(r), "=m" (*val)
72	);	72	);
73	return r;	73	return r;
74	}	74	}
75		75
76	#define atomic_inc_post(val) (atomic_inc_pre(val)+1)	76	#define atomic_inc_post(val) (atomic_inc_pre(val)+1)
77	#define atomic_dec_post(val) (atomic_dec_pre(val)-1)	77	#define atomic_dec_post(val) (atomic_dec_pre(val)-1)
78		78
79		-
80		-
81	static inline int test_and_set(volatile int *val) {	79	static inline int test_and_set(volatile int *val) {
82	int v;	80	int v;
83		81
84	__asm__ volatile (	82	__asm__ volatile (
85	"movl $1, %0\n"	83	"movl $1, %0\n"
86	"xchgl %0, %1\n"	84	"xchgl %0, %1\n"
87	: "=r" (v),"=m" (*val)	85	: "=r" (v),"=m" (*val)
88	);	86	);
89		87
90	return v;	88	return v;
91	}	89	}
92		90
93		91
94	extern void spinlock_arch(volatile int *val);	92	extern void spinlock_arch(volatile int *val);
95		93
96	#endif	94	#endif
97		95

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/ia32/include/atomic.h @ 625 – Rev 534 → 557