blob: 0ceef9108feac1a13c981813373aa1d6fad166e2 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
#ifndef __ASM_HARDIRQ_H
#define __ASM_HARDIRQ_H
#include <linux/tasks.h>
extern unsigned int local_irq_count[NR_CPUS];
#define in_interrupt() (local_irq_count[smp_processor_id()] != 0)
#ifndef __SMP__
#define hardirq_trylock(cpu) (local_irq_count[cpu] == 0)
#define hardirq_endlock(cpu) do { } while (0)
#define hardirq_enter(cpu) (local_irq_count[cpu]++)
#define hardirq_exit(cpu) (local_irq_count[cpu]--)
#define synchronize_irq() do { } while (0)
#else
#include <asm/atomic.h>
extern unsigned char global_irq_holder;
extern unsigned volatile int global_irq_lock;
extern atomic_t global_irq_count;
static inline void release_irqlock(int cpu)
{
/* if we didn't own the irq lock, just ignore.. */
if (global_irq_holder == (unsigned char) cpu) {
global_irq_holder = NO_PROC_ID;
global_irq_lock = 0;
}
}
static inline void hardirq_enter(int cpu)
{
++local_irq_count[cpu];
atomic_inc(&global_irq_count);
}
static inline void hardirq_exit(int cpu)
{
atomic_dec(&global_irq_count);
--local_irq_count[cpu];
}
static inline int hardirq_trylock(int cpu)
{
unsigned long flags;
__save_flags(flags);
__cli();
atomic_inc(&global_irq_count);
if (atomic_read(&global_irq_count) != 1 || test_bit(0,&global_irq_lock)) {
atomic_dec(&global_irq_count);
__restore_flags(flags);
return 0;
}
++local_irq_count[cpu];
return 1;
}
static inline void hardirq_endlock(int cpu)
{
__cli();
hardirq_exit(cpu);
__sti();
}
extern void synchronize_irq(void);
#endif /* __SMP__ */
#endif /* __ASM_HARDIRQ_H */
|
