Subversion Repositories HelenOS-historic

Rev

Rev 1024 | Rev 1104 | Go to most recent revision | Show entire file | Regard whitespace | Details | Blame | Last modification | View Log | RSS feed

Rev 1024 Rev 1100
Line 28... Line 28...
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
#include <arch/barrier.h>
-
 
34
#include <preemption.h>
33
 
35
 
34
typedef struct { volatile __u32 count; } atomic_t;
36
typedef struct { volatile __u32 count; } atomic_t;
35
 
37
 
36
static inline void atomic_set(atomic_t *val, __u32 i)
38
static inline void atomic_set(atomic_t *val, __u32 i)
37
{
39
{
Line 98... Line 100...
98
    );
100
    );
99
   
101
   
100
    return v;
102
    return v;
101
}
103
}
102
 
104
 
-
 
105
/** Ia32 specific fast spinlock */
-
 
106
static inline void atomic_lock_arch(atomic_t *val)
-
 
107
{
-
 
108
    __u32 tmp;
103
 
109
 
-
 
110
    preemption_disable();
-
 
111
    __asm__ volatile (
-
 
112
        "0:;"
-
 
113
#ifdef CONFIG_HT
-
 
114
        "pause;" /* Pentium 4's HT love this instruction */
-
 
115
#endif
-
 
116
        "mov %0, %1;"
-
 
117
        "testl %1, %1;"
-
 
118
        "jnz 0b;"       /* Leightweight looping on locked spinlock */
-
 
119
       
-
 
120
        "incl %1;"      /* now use the atomic operation */
-
 
121
        "xchgl %0, %1;"
-
 
122
        "testl %1, %1;"
-
 
123
        "jnz 0b;"
-
 
124
                : "=m"(val->count),"=r"(tmp)
-
 
125
        );
-
 
126
    /*
104
extern void spinlock_arch(volatile int *val);
127
     * Prevent critical section code from bleeding out this way up.
-
 
128
     */
-
 
129
    CS_ENTER_BARRIER();
-
 
130
}
105
 
131
 
106
#endif
132
#endif