WebSVN – HelenOS – Diff – /trunk/kernel/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.
 */
 
/** @addtogroup ia32   
 * @{
 */
/** @file
 */
 
#ifndef KERN_ia32_ATOMIC_H_
#define KERN_ia32_ATOMIC_H_
 
#include <arch/types.h>
#include <arch/barrier.h>
#include <preemption.h>
 
 
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 long atomic_postinc(atomic_t *val)
{
    long r = 1;
 
    asm volatile (
        "lock xaddl %1, %0\n"
        : "=m" (val->count), "+r" (r)
    );
 
    return r;
}
 
static inline long atomic_postdec(atomic_t *val)
{
    long r = -1;
   
    asm volatile (
        "lock xaddl %1, %0\n"
        : "=m" (val->count), "+r"(r)
    );
   
    return r;
}
 
#define atomic_preinc(val) (atomic_postinc(val)+1)
#define atomic_predec(val) (atomic_postdec(val)-1)
 
static inline uint32_t test_and_set(atomic_t *val) {
    uint32_t v;
   
    asm volatile (
        "movl $1, %0\n"
        "xchgl %0, %1\n"
        : "=r" (v),"=m" (val->count)
    );
   
    return v;
}
 
/** ia32 specific fast spinlock */
static inline void atomic_lock_arch(atomic_t *val)
{
    uint32_t tmp;
 
    preemption_disable();
    asm volatile (
        "0:;"
#ifdef CONFIG_HT
        "pause;" /* Pentium 4's HT love this instruction */
#endif
        "mov %0, %1;"
        "testl %1, %1;"
        "jnz 0b;"       /* Lightweight looping on locked spinlock */
       
        "incl %1;"      /* now use the atomic operation */
        "xchgl %0, %1;"
        "testl %1, %1;"
        "jnz 0b;"
                : "=m"(val->count),"=r"(tmp)
        );
    /*
     * Prevent critical section code from bleeding out this way up.
     */
    CS_ENTER_BARRIER();
}
 
#endif
 
/** @}
 */
 

Rev 2082	Rev 2089
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	/** @addtogroup ia32	29	/** @addtogroup ia32
30	* @{	30	* @{
31	*/	31	*/
32	/** @file	32	/** @file
33	*/	33	*/
34		34
35	#ifndef KERN_ia32_ATOMIC_H_	35	#ifndef KERN_ia32_ATOMIC_H_
36	#define KERN_ia32_ATOMIC_H_	36	#define KERN_ia32_ATOMIC_H_
37		37
38	#include <arch/types.h>	38	#include <arch/types.h>
39	#include <arch/barrier.h>	39	#include <arch/barrier.h>
40	#include <preemption.h>	40	#include <preemption.h>
41	#include <typedefs.h>	-
42		41
43	static inline void atomic_inc(atomic_t *val) {	42	static inline void atomic_inc(atomic_t *val) {
44	#ifdef CONFIG_SMP	43	#ifdef CONFIG_SMP
45	asm volatile ("lock incl %0\n" : "=m" (val->count));	44	asm volatile ("lock incl %0\n" : "=m" (val->count));
46	#else	45	#else
47	asm volatile ("incl %0\n" : "=m" (val->count));	46	asm volatile ("incl %0\n" : "=m" (val->count));
48	#endif /* CONFIG_SMP */	47	#endif /* CONFIG_SMP */
49	}	48	}
50		49
51	static inline void atomic_dec(atomic_t *val) {	50	static inline void atomic_dec(atomic_t *val) {
52	#ifdef CONFIG_SMP	51	#ifdef CONFIG_SMP
53	asm volatile ("lock decl %0\n" : "=m" (val->count));	52	asm volatile ("lock decl %0\n" : "=m" (val->count));
54	#else	53	#else
55	asm volatile ("decl %0\n" : "=m" (val->count));	54	asm volatile ("decl %0\n" : "=m" (val->count));
56	#endif /* CONFIG_SMP */	55	#endif /* CONFIG_SMP */
57	}	56	}
58		57
59	static inline long atomic_postinc(atomic_t *val)	58	static inline long atomic_postinc(atomic_t *val)
60	{	59	{
61	long r = 1;	60	long r = 1;
62		61
63	asm volatile (	62	asm volatile (
64	"lock xaddl %1, %0\n"	63	"lock xaddl %1, %0\n"
65	: "=m" (val->count), "+r" (r)	64	: "=m" (val->count), "+r" (r)
66	);	65	);
67		66
68	return r;	67	return r;
69	}	68	}
70		69
71	static inline long atomic_postdec(atomic_t *val)	70	static inline long atomic_postdec(atomic_t *val)
72	{	71	{
73	long r = -1;	72	long r = -1;
74		73
75	asm volatile (	74	asm volatile (
76	"lock xaddl %1, %0\n"	75	"lock xaddl %1, %0\n"
77	: "=m" (val->count), "+r"(r)	76	: "=m" (val->count), "+r"(r)
78	);	77	);
79		78
80	return r;	79	return r;
81	}	80	}
82		81
83	#define atomic_preinc(val) (atomic_postinc(val)+1)	82	#define atomic_preinc(val) (atomic_postinc(val)+1)
84	#define atomic_predec(val) (atomic_postdec(val)-1)	83	#define atomic_predec(val) (atomic_postdec(val)-1)
85		84
86	static inline uint32_t test_and_set(atomic_t *val) {	85	static inline uint32_t test_and_set(atomic_t *val) {
87	uint32_t v;	86	uint32_t v;
88		87
89	asm volatile (	88	asm volatile (
90	"movl $1, %0\n"	89	"movl $1, %0\n"
91	"xchgl %0, %1\n"	90	"xchgl %0, %1\n"
92	: "=r" (v),"=m" (val->count)	91	: "=r" (v),"=m" (val->count)
93	);	92	);
94		93
95	return v;	94	return v;
96	}	95	}
97		96
98	/** ia32 specific fast spinlock */	97	/** ia32 specific fast spinlock */
99	static inline void atomic_lock_arch(atomic_t *val)	98	static inline void atomic_lock_arch(atomic_t *val)
100	{	99	{
101	uint32_t tmp;	100	uint32_t tmp;
102		101
103	preemption_disable();	102	preemption_disable();
104	asm volatile (	103	asm volatile (
105	"0:;"	104	"0:;"
106	#ifdef CONFIG_HT	105	#ifdef CONFIG_HT
107	"pause;" /* Pentium 4's HT love this instruction */	106	"pause;" /* Pentium 4's HT love this instruction */
108	#endif	107	#endif
109	"mov %0, %1;"	108	"mov %0, %1;"
110	"testl %1, %1;"	109	"testl %1, %1;"
111	"jnz 0b;" /* Lightweight looping on locked spinlock */	110	"jnz 0b;" /* Lightweight looping on locked spinlock */
112		111
113	"incl %1;" /* now use the atomic operation */	112	"incl %1;" /* now use the atomic operation */
114	"xchgl %0, %1;"	113	"xchgl %0, %1;"
115	"testl %1, %1;"	114	"testl %1, %1;"
116	"jnz 0b;"	115	"jnz 0b;"
117	: "=m"(val->count),"=r"(tmp)	116	: "=m"(val->count),"=r"(tmp)
118	);	117	);
119	/*	118	/*
120	* Prevent critical section code from bleeding out this way up.	119	* Prevent critical section code from bleeding out this way up.
121	*/	120	*/
122	CS_ENTER_BARRIER();	121	CS_ENTER_BARRIER();
123	}	122	}
124		123
125	#endif	124	#endif
126		125
127	/** @}	126	/** @}
128	*/	127	*/
129		128

Subversion Repositories HelenOS

(root)/trunk/kernel/arch/ia32/include/atomic.h – Rev 2082 → 2089