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__
 
static inline void atomic_inc(atomic_t *val)
{
    long 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)
{
    long 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 long atomic_postinc(atomic_t *val)
{
    atomic_inc(val);
    return val->count - 1;
}
 
static inline long atomic_postdec(atomic_t *val)
{
    atomic_dec(val);
    return val->count + 1;
}
 
static inline long atomic_preinc(atomic_t *val)
{
    atomic_inc(val);
    return val->count;
}
 
static inline long atomic_predec(atomic_t *val)
{
    atomic_dec(val);
    return val->count;
}
 
#endif
 

Rev 1107	Rev 1267
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	static inline void atomic_inc(atomic_t *val)	32	static inline void atomic_inc(atomic_t *val)
33	{	33	{
34	long tmp;	34	long tmp;
35		35
36	asm __volatile__ (	36	asm volatile (
37	"1:\n"	37	"1:\n"
38	"lwarx %0, 0, %2\n"	38	"lwarx %0, 0, %2\n"
39	"addic %0, %0, 1\n"	39	"addic %0, %0, 1\n"
40	"stwcx. %0, 0, %2\n"	40	"stwcx. %0, 0, %2\n"
41	"bne- 1b"	41	"bne- 1b"
42	: "=&r" (tmp), "=m" (val->count)	42	: "=&r" (tmp), "=m" (val->count)
43	: "r" (&val->count), "m" (val->count)	43	: "r" (&val->count), "m" (val->count)
44	: "cc");	44	: "cc"
-		45	);
45	}	46	}
46		47
47	static inline void atomic_dec(atomic_t *val)	48	static inline void atomic_dec(atomic_t *val)
48	{	49	{
49	long tmp;	50	long tmp;
50		51
51	asm __volatile__(	52	asm volatile (
52	"1:\n"	53	"1:\n"
53	"lwarx %0, 0, %2\n"	54	"lwarx %0, 0, %2\n"
54	"addic %0, %0, -1\n"	55	"addic %0, %0, -1\n"
55	"stwcx. %0, 0, %2\n"	56	"stwcx. %0, 0, %2\n"
56	"bne- 1b"	57	"bne- 1b"
57	: "=&r" (tmp), "=m" (val->count)	58	: "=&r" (tmp), "=m" (val->count)
58	: "r" (&val->count), "m" (val->count)	59	: "r" (&val->count), "m" (val->count)
59	: "cc");	60	: "cc"
-		61	);
60	}	62	}
61		63
62	static inline long atomic_postinc(atomic_t *val)	64	static inline long atomic_postinc(atomic_t *val)
63	{	65	{
64	atomic_inc(val);	66	atomic_inc(val);
65	return val->count - 1;	67	return val->count - 1;
66	}	68	}
67		69
68	static inline long atomic_postdec(atomic_t *val)	70	static inline long atomic_postdec(atomic_t *val)
69	{	71	{
70	atomic_dec(val);	72	atomic_dec(val);
71	return val->count + 1;	73	return val->count + 1;
72	}	74	}
73		75
74	static inline long atomic_preinc(atomic_t *val)	76	static inline long atomic_preinc(atomic_t *val)
75	{	77	{
76	atomic_inc(val);	78	atomic_inc(val);
77	return val->count;	79	return val->count;
78	}	80	}
79		81
80	static inline long atomic_predec(atomic_t *val)	82	static inline long atomic_predec(atomic_t *val)
81	{	83	{
82	atomic_dec(val);	84	atomic_dec(val);
83	return val->count;	85	return val->count;
84	}	86	}
85		87
86	#endif	88	#endif
87		89

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/ppc32/include/atomic.h – Rev 1107 → 1267