WebSVN – HelenOS-historic – Diff – /kernel/trunk/arch/mips32/include/atomic.h


/*
 * Copyright (C) 2005 Ondrej Palkovsky
 * 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 __mips32_ATOMIC_H__
#define __mips32_ATOMIC_H__
 
#include <arch/types.h>
 
#define atomic_inc(x)   ((void) atomic_add(x, 1))
#define atomic_dec(x)   ((void) atomic_add(x, -1))
 
#define atomic_inc_pre(x) (atomic_add(x, 1) - 1)
#define atomic_dec_pre(x) (atomic_add(x, -1) + 1)
 
#define atomic_inc_post(x) atomic_add(x, 1)
#define atomic_dec_post(x) atomic_add(x, -1)
 
 
typedef struct { volatile __u32 count; } atomic_t;
 
/* Atomic addition of immediate value.
 *
 * @param val Memory location to which will be the immediate value added.
 * @param i Signed immediate that will be added to *val.
 *
 * @return Value after addition.
 */
static inline count_t atomic_add(atomic_t *val, int i)
{
    count_t tmp, v;
 
    __asm__ volatile (
        "1:\n"
        "   ll %0, %1\n"
        "   addiu %0, %0, %3\n" /* same as addi, but never traps on overflow */
        "       move %2, %0\n"
        "   sc %0, %1\n"
        "   beq %0, %4, 1b\n"   /* if the atomic operation failed, try again */
        /*  nop */      /* nop is inserted automatically by compiler */
        : "=r" (tmp), "=m" (val->count), "=r" (v)
        : "i" (i), "i" (0)
        );
 
    return v;
}
 
/* Reads/writes are atomic on mips for 4-bytes */
 
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
 

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/mips32/include/atomic.h – Rev 625 → 627

Rev 625		Rev 627
1	/*	1	/*
2	* Copyright (C) 2005 Ondrej Palkovsky	2	* Copyright (C) 2005 Ondrej Palkovsky
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 __mips32_ATOMIC_H__	29	#ifndef __mips32_ATOMIC_H__
30	#define __mips32_ATOMIC_H__	30	#define __mips32_ATOMIC_H__
31		31
32	#include <arch/types.h>	32	#include <arch/types.h>
33		33
34	#define atomic_inc(x) ((void) atomic_add(x, 1))	34	#define atomic_inc(x) ((void) atomic_add(x, 1))
35	#define atomic_dec(x) ((void) atomic_add(x, -1))	35	#define atomic_dec(x) ((void) atomic_add(x, -1))
36		36
37	#define atomic_inc_pre(x) (atomic_add(x, 1) - 1)	37	#define atomic_inc_pre(x) (atomic_add(x, 1) - 1)
38	#define atomic_dec_pre(x) (atomic_add(x, -1) + 1)	38	#define atomic_dec_pre(x) (atomic_add(x, -1) + 1)
39		39
40	#define atomic_inc_post(x) atomic_add(x, 1)	40	#define atomic_inc_post(x) atomic_add(x, 1)
41	#define atomic_dec_post(x) atomic_add(x, -1)	41	#define atomic_dec_post(x) atomic_add(x, -1)
42		42
43		43
44	typedef struct { volatile __u32 count; } atomic_t;	44	typedef struct { volatile __u32 count; } atomic_t;
45		45
46	/* Atomic addition of immediate value.	46	/* Atomic addition of immediate value.
47	*	47	*
48	* @param val Memory location to which will be the immediate value added.	48	* @param val Memory location to which will be the immediate value added.
49	* @param i Signed immediate that will be added to *val.	49	* @param i Signed immediate that will be added to *val.
50	*	50	*
51	* @return Value after addition.	51	* @return Value after addition.
52	*/	52	*/
53	static inline atomic_t atomic_add(atomic_t *val, int i)	53	static inline count_t atomic_add(atomic_t *val, int i)
54	{	54	{
55	atomic_t tmp, v;	55	count_t tmp, v;
56		56
57	__asm__ volatile (	57	__asm__ volatile (
58	"1:\n"	58	"1:\n"
59	" ll %0, %1\n"	59	" ll %0, %1\n"
60	" addiu %0, %0, %3\n" /* same as addi, but never traps on overflow */	60	" addiu %0, %0, %3\n" /* same as addi, but never traps on overflow */
61	" move %2, %0\n"	61	" move %2, %0\n"
62	" sc %0, %1\n"	62	" sc %0, %1\n"
63	" beq %0, %4, 1b\n" /* if the atomic operation failed, try again */	63	" beq %0, %4, 1b\n" /* if the atomic operation failed, try again */
64	/* nop / / nop is inserted automatically by compiler */	64	/* nop / / nop is inserted automatically by compiler */
65	: "=r" (tmp), "=m" (val->count), "=r" (v)	65	: "=r" (tmp), "=m" (val->count), "=r" (v)
66	: "i" (i), "i" (0)	66	: "i" (i), "i" (0)
67	);	67	);
68		68
69	return v;	69	return v;
70	}	70	}
71		71
72	/* Reads/writes are atomic on mips for 4-bytes */	72	/* Reads/writes are atomic on mips for 4-bytes */
73		73
74	static inline void atomic_set(atomic_t *val, __u32 i)	74	static inline void atomic_set(atomic_t *val, __u32 i)
75	{	75	{
76	val->count = i;	76	val->count = i;
77	}	77	}
78		78
79	static inline __u32 atomic_get(atomic_t *val)	79	static inline __u32 atomic_get(atomic_t *val)
80	{	80	{
81	return val->count;	81	return val->count;
82	}	82	}
83		83
84	#endif	84	#endif
85		85