File: /usr/src/linux/include/asm-sh/hardirq.h

1     #ifndef __ASM_SH_HARDIRQ_H
2     #define __ASM_SH_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_pending;
10     	unsigned int __local_irq_count;
11     	unsigned int __local_bh_count;
12     	unsigned int __syscall_count;
13     	struct task_struct * __ksoftirqd_task;
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     #define in_interrupt() ({ int __cpu = smp_processor_id(); \
23     	(local_irq_count(__cpu) + local_bh_count(__cpu) != 0); })
24     
25     #define in_irq() (local_irq_count(smp_processor_id()) != 0)
26     
27     #ifndef CONFIG_SMP
28     
29     #define hardirq_trylock(cpu)	(local_irq_count(cpu) == 0)
30     #define hardirq_endlock(cpu)	do { } while (0)
31     
32     #define irq_enter(cpu, irq)	(local_irq_count(cpu)++)
33     #define irq_exit(cpu, irq)	(local_irq_count(cpu)--)
34     
35     #define synchronize_irq()	barrier()
36     
37     #else
38     
39     #error Super-H SMP is not available
40     
41     #endif /* CONFIG_SMP */
42     #endif /* __ASM_SH_HARDIRQ_H */
43