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[linux-2.6.git] / include / asm-m32r / hardirq.h
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 typedef struct {
9         unsigned int __softirq_pending;
10         unsigned int __syscall_count;
11         struct task_struct * __ksoftirqd_task; /* waitqueue is too large */
12 } ____cacheline_aligned irq_cpustat_t;
13
14 #include <linux/irq_cpustat.h>  /* Standard mappings for irq_cpustat_t above */
15
16 /*
17  * We put the hardirq and softirq counter into the preemption
18  * counter. The bitmask has the following meaning:
19  *
20  * - bits 0-7 are the preemption count (max preemption depth: 256)
21  * - bits 8-15 are the softirq count (max # of softirqs: 256)
22  * - bits 16-23 are the hardirq count (max # of hardirqs: 256)
23  *
24  * - ( bit 26 is the PREEMPT_ACTIVE flag. )
25  *
26  * PREEMPT_MASK: 0x000000ff
27  * SOFTIRQ_MASK: 0x0000ff00
28  * HARDIRQ_MASK: 0x00ff0000
29  */
30
31 #define PREEMPT_BITS    8
32 #define SOFTIRQ_BITS    8
33
34 #if NR_IRQS > 256
35 #define HARDIRQ_BITS    9
36 #else
37 #define HARDIRQ_BITS    8
38 #endif
39
40 #define PREEMPT_SHIFT   0
41 #define SOFTIRQ_SHIFT   (PREEMPT_SHIFT + PREEMPT_BITS)
42 #define HARDIRQ_SHIFT   (SOFTIRQ_SHIFT + SOFTIRQ_BITS)
43
44 /*
45  * The hardirq mask has to be large enough to have
46  * space for potentially all IRQ sources in the system
47  * nesting on a single CPU:
48  */
49 #if (1 << HARDIRQ_BITS) < NR_IRQS
50 # error HARDIRQ_BITS is too low!
51 #endif
52
53 #define irq_enter()             (preempt_count() += HARDIRQ_OFFSET)
54 #define nmi_enter()             (irq_enter())
55 #define nmi_exit()              (preempt_count() -= HARDIRQ_OFFSET)
56
57 #define irq_exit()                                                      \
58 do {                                                                    \
59                 preempt_count() -= IRQ_EXIT_OFFSET;                     \
60                 if (!in_interrupt() && softirq_pending(smp_processor_id())) \
61                         do_softirq();                                   \
62                 preempt_enable_no_resched();                            \
63 } while (0)
64
65 #endif /* __ASM_HARDIRQ_H */