1 #ifndef _ALPHA_HARDIRQ_H
2 #define _ALPHA_HARDIRQ_H
3
4 #include <linux/config.h>
5 #include <linux/threads.h>
6
7 /* entry.S is sensitive to the offsets of these fields */
8 typedef struct {
9 unsigned int __softirq_active;
10 unsigned int __softirq_mask;
11 unsigned int __local_irq_count;
12 unsigned int __local_bh_count;
13 unsigned int __syscall_count;
14 } ____cacheline_aligned irq_cpustat_t;
15
16 #include <linux/irq_cpustat.h> /* Standard mappings for irq_cpustat_t above */
17
18 /*
19 * Are we in an interrupt context? Either doing bottom half
20 * or hardware interrupt processing?
21 */
22
23 #define in_interrupt() \
24 ({ \
25 int __cpu = smp_processor_id(); \
26 (local_irq_count(__cpu) + local_bh_count(__cpu)) != 0; \
27 })
28
29 #define in_irq() (local_irq_count(smp_processor_id()) != 0)
30
31 #ifndef CONFIG_SMP
32
33 extern unsigned long __irq_attempt[];
34 #define irq_attempt(cpu, irq) ((void)(cpu), __irq_attempt[irq])
35
36 #define hardirq_trylock(cpu) (local_irq_count(cpu) == 0)
37 #define hardirq_endlock(cpu) ((void) 0)
38
39 #define irq_enter(cpu, irq) (local_irq_count(cpu)++)
40 #define irq_exit(cpu, irq) (local_irq_count(cpu)--)
41
42 #define synchronize_irq() barrier()
43
44 #else
45
46 #define irq_attempt(cpu, irq) (cpu_data[cpu].irq_attempt[irq])
47
48 #include <asm/atomic.h>
49 #include <linux/spinlock.h>
50 #include <asm/smp.h>
51
52 extern int global_irq_holder;
53 extern spinlock_t global_irq_lock;
54
55 static inline int irqs_running (void)
56 {
57 int i;
58
59 for (i = 0; i < smp_num_cpus; i++)
60 if (local_irq_count(i))
61 return 1;
62 return 0;
63 }
64
65 static inline void release_irqlock(int cpu)
66 {
67 /* if we didn't own the irq lock, just ignore.. */
68 if (global_irq_holder == cpu) {
69 global_irq_holder = NO_PROC_ID;
70 spin_unlock(&global_irq_lock);
71 }
72 }
73
74 static inline void irq_enter(int cpu, int irq)
75 {
76 ++local_irq_count(cpu);
77
78 while (spin_is_locked(&global_irq_lock))
79 barrier();
80 }
81
82 static inline void irq_exit(int cpu, int irq)
83 {
84 --local_irq_count(cpu);
85 }
86
87 static inline int hardirq_trylock(int cpu)
88 {
89 return !local_irq_count(cpu) && !spin_is_locked(&global_irq_lock);
90 }
91
92 #define hardirq_endlock(cpu) do { } while (0)
93
94 extern void synchronize_irq(void);
95
96 #endif /* CONFIG_SMP */
97 #endif /* _ALPHA_HARDIRQ_H */
98
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