WebSVN – HelenOS-historic – Diff – /kernel/trunk/arch/ppc32/include/atomic.h


/*
 * Copyright (C) 2005 Martin Decky
 * 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 __ppc32_ATOMIC_H__
#define __ppc32_ATOMIC_H__
 
#include <arch/types.h>
 
typedef struct { volatile __u32 count; } atomic_t;
 
static inline void atomic_inc(atomic_t *val)
{
    __u32 tmp;
 
    asm __volatile__ (
        "1:\n"
        "lwarx %0, 0, %2\n"
        "addic %0, %0, 1\n"
        "stwcx. %0, 0, %2\n"
        "bne- 1b"
        : "=&r" (tmp), "=m" (val->count)
        : "r" (&val->count), "m" (val->count)
        : "cc");
}
 
static inline void atomic_dec(atomic_t *val)
{
    __u32 tmp;
 
    asm __volatile__(
        "1:\n"
        "lwarx %0, 0, %2\n"
        "addic %0, %0, -1\n"
        "stwcx. %0, 0, %2\n"
        "bne- 1b"
        : "=&r" (tmp), "=m" (val->count)
        : "r" (&val->count), "m" (val->count)
        : "cc");
}
 
static inline __u32 atomic_postinc(atomic_t *val)
{
    atomic_inc(val);
    return val->count - 1;
}
 
static inline __u32 atomic_postdec(atomic_t *val)
{
    atomic_dec(val);
    return val->count + 1;
}
 
static inline __u32 atomic_preinc(atomic_t *val)
{
    atomic_inc(val);
    return val->count;
}
 
static inline __u32 atomic_predec(atomic_t *val)
{
    atomic_dec(val);
    return val->count;
}
 
static inline void atomic_set(atomic_t *val, __u32 i)
{
    val->count = i;
}
 
static inline __u32 atomic_get(atomic_t *val)
{
    return val->count;
}
 
#endif
 

Rev 1001	Rev 1024
1	/*	1	/*
2	* Copyright (C) 2005 Martin Decky	2	* Copyright (C) 2005 Martin Decky
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 __ppc32_ATOMIC_H__	29	#ifndef __ppc32_ATOMIC_H__
30	#define __ppc32_ATOMIC_H__	30	#define __ppc32_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_inc(atomic_t *val)	36	static inline void atomic_inc(atomic_t *val)
37	{	37	{
38	__u32 tmp;	38	__u32 tmp;
39		39
40	asm __volatile__ (	40	asm __volatile__ (
41	"1:\n"	41	"1:\n"
42	"lwarx %0, 0, %2\n"	42	"lwarx %0, 0, %2\n"
43	"addic %0, %0, 1\n"	43	"addic %0, %0, 1\n"
44	"stwcx. %0, 0, %2\n"	44	"stwcx. %0, 0, %2\n"
45	"bne- 1b"	45	"bne- 1b"
46	: "=&r" (tmp), "=m" (val->count)	46	: "=&r" (tmp), "=m" (val->count)
47	: "r" (&val->count), "m" (val->count)	47	: "r" (&val->count), "m" (val->count)
48	: "cc");	48	: "cc");
49	}	49	}
50		50
51	static inline void atomic_dec(atomic_t *val)	51	static inline void atomic_dec(atomic_t *val)
52	{	52	{
53	__u32 tmp;	53	__u32 tmp;
54		54
55	asm __volatile__(	55	asm __volatile__(
56	"1:\n"	56	"1:\n"
57	"lwarx %0, 0, %2\n"	57	"lwarx %0, 0, %2\n"
58	"addic %0, %0, -1\n"	58	"addic %0, %0, -1\n"
59	"stwcx. %0, 0, %2\n"	59	"stwcx. %0, 0, %2\n"
60	"bne- 1b"	60	"bne- 1b"
61	: "=&r" (tmp), "=m" (val->count)	61	: "=&r" (tmp), "=m" (val->count)
62	: "r" (&val->count), "m" (val->count)	62	: "r" (&val->count), "m" (val->count)
63	: "cc");	63	: "cc");
64	}	64	}
65		65
66	static inline __u32 atomic_inc_pre(atomic_t *val)	66	static inline __u32 atomic_postinc(atomic_t *val)
67	{	67	{
68	atomic_inc(val);	68	atomic_inc(val);
69	return val->count - 1;	69	return val->count - 1;
70	}	70	}
71		71
72	static inline __u32 atomic_dec_pre(atomic_t *val)	72	static inline __u32 atomic_postdec(atomic_t *val)
73	{	73	{
74	atomic_dec(val);	74	atomic_dec(val);
75	return val->count + 1;	75	return val->count + 1;
76	}	76	}
77		77
78	static inline __u32 atomic_inc_post(atomic_t *val)	78	static inline __u32 atomic_preinc(atomic_t *val)
79	{	79	{
80	atomic_inc(val);	80	atomic_inc(val);
81	return val->count;	81	return val->count;
82	}	82	}
83		83
84	static inline __u32 atomic_dec_post(atomic_t *val)	84	static inline __u32 atomic_predec(atomic_t *val)
85	{	85	{
86	atomic_dec(val);	86	atomic_dec(val);
87	return val->count;	87	return val->count;
88	}	88	}
89		89
90	static inline void atomic_set(atomic_t *val, __u32 i)	90	static inline void atomic_set(atomic_t *val, __u32 i)
91	{	91	{
92	val->count = i;	92	val->count = i;
93	}	93	}
94		94
95	static inline __u32 atomic_get(atomic_t *val)	95	static inline __u32 atomic_get(atomic_t *val)
96	{	96	{
97	return val->count;	97	return val->count;
98	}	98	}
99		99
100	#endif	100	#endif
101		101

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/ppc32/include/atomic.h @ 1001 – Rev 1001 → 1024