1 #ifndef __ASM_HARDIRQ_H
2 #define __ASM_HARDIRQ_H
3
4 #include <linux/config.h>
5 #include <linux/threads.h>
6 #include <linux/irq.h>
7
8 /* entry.S is sensitive to the offsets of these fields */
9 typedef struct {
10 unsigned int __softirq_active;
11 unsigned int __softirq_mask;
12 unsigned int __local_irq_count;
13 unsigned int __local_bh_count;
14 unsigned int __syscall_count;
15 unsigned int __nmi_count; /* arch dependent */
16 } ____cacheline_aligned irq_cpustat_t;
17
18 #include <linux/irq_cpustat.h> /* Standard mappings for irq_cpustat_t above */
19
20 /*
21 * Are we in an interrupt context? Either doing bottom half
22 * or hardware interrupt processing?
23 */
24 #define in_interrupt() ({ int __cpu = smp_processor_id(); \
25 (local_irq_count(__cpu) + local_bh_count(__cpu) != 0); })
26
27 #define in_irq() (local_irq_count(smp_processor_id()) != 0)
28
29 #ifndef CONFIG_SMP
30
31 #define hardirq_trylock(cpu) (local_irq_count(cpu) == 0)
32 #define hardirq_endlock(cpu) do { } while (0)
33
34 #define irq_enter(cpu, irq) (local_irq_count(cpu)++)
35 #define irq_exit(cpu, irq) (local_irq_count(cpu)--)
36
37 #define synchronize_irq() barrier()
38
39 #else
40
41 #include <asm/atomic.h>
42 #include <asm/smp.h>
43
44 extern unsigned char global_irq_holder;
45 extern unsigned volatile long global_irq_lock; /* long for set_bit -RR */
46
47 static inline int irqs_running (void)
48 {
49 int i;
50
51 for (i = 0; i < smp_num_cpus; i++)
52 if (local_irq_count(i))
53 return 1;
54 return 0;
55 }
56
57 static inline void release_irqlock(int cpu)
58 {
59 /* if we didn't own the irq lock, just ignore.. */
60 if (global_irq_holder == (unsigned char) cpu) {
61 global_irq_holder = NO_PROC_ID;
62 clear_bit(0,&global_irq_lock);
63 }
64 }
65
66 static inline void irq_enter(int cpu, int irq)
67 {
68 ++local_irq_count(cpu);
69
70 while (test_bit(0,&global_irq_lock)) {
71 /* nothing */;
72 }
73 }
74
75 static inline void irq_exit(int cpu, int irq)
76 {
77 --local_irq_count(cpu);
78 }
79
80 static inline int hardirq_trylock(int cpu)
81 {
82 return !local_irq_count(cpu) && !test_bit(0,&global_irq_lock);
83 }
84
85 #define hardirq_endlock(cpu) do { } while (0)
86
87 extern void synchronize_irq(void);
88
89 #endif /* CONFIG_SMP */
90
91 #endif /* __ASM_HARDIRQ_H */
92
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