vserver 1.9.3
[linux-2.6.git] / include / asm-sparc64 / hardirq.h
1 /* hardirq.h: 64-bit Sparc hard IRQ support.
2  *
3  * Copyright (C) 1997, 1998 David S. Miller (davem@caip.rutgers.edu)
4  */
5
6 #ifndef __SPARC64_HARDIRQ_H
7 #define __SPARC64_HARDIRQ_H
8
9 #include <linux/config.h>
10 #include <linux/threads.h>
11 #include <linux/spinlock.h>
12 #include <linux/cache.h>
13
14 /* rtrap.S is sensitive to the offsets of these fields */
15 typedef struct {
16         unsigned int __softirq_pending;
17 } ____cacheline_aligned irq_cpustat_t;
18
19 #include <linux/irq_cpustat.h>  /* Standard mappings for irq_cpustat_t above */
20
21 /*
22  * We put the hardirq and softirq counter into the preemption
23  * counter. The bitmask has the following meaning:
24  *
25  * - bits 0-7 are the preemption count (max preemption depth: 256)
26  * - bits 8-15 are the softirq count (max # of softirqs: 256)
27  * - bits 16-23 are the hardirq count (max # of hardirqs: 256)
28  *
29  * - ( bit 26 is the PREEMPT_ACTIVE flag. )
30  *
31  * PREEMPT_MASK: 0x000000ff
32  * SOFTIRQ_MASK: 0x0000ff00
33  * HARDIRQ_MASK: 0x00ff0000
34  */
35
36 #define PREEMPT_BITS    8
37 #define SOFTIRQ_BITS    8
38 #define HARDIRQ_BITS    8
39
40 #define PREEMPT_SHIFT   0
41 #define SOFTIRQ_SHIFT   (PREEMPT_SHIFT + PREEMPT_BITS)
42 #define HARDIRQ_SHIFT   (SOFTIRQ_SHIFT + SOFTIRQ_BITS)
43
44 #define irq_enter()             (preempt_count() += HARDIRQ_OFFSET)
45 #define irq_exit()                                                      \
46 do {                                                                    \
47                 preempt_count() -= IRQ_EXIT_OFFSET;                     \
48                 if (!in_interrupt() && softirq_pending(smp_processor_id())) \
49                         do_softirq();                                   \
50                 preempt_enable_no_resched();                            \
51 } while (0)
52
53 #endif /* !(__SPARC64_HARDIRQ_H) */