include/asm-sparc/hardirq.h

   1 /* hardirq.h: 32-bit Sparc hard IRQ support.
   2  *
   3  * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
   4  * Copyright (C) 1998-2000 Anton Blanchard (anton@samba.org)
   5  */
   6
   7 #ifndef __SPARC_HARDIRQ_H
   8 #define __SPARC_HARDIRQ_H
   9
  10 #include <linux/config.h>
  11 #include <linux/threads.h>
  12 #include <linux/spinlock.h>
  13 #include <linux/cache.h>
  14
  15 /* entry.S is sensitive to the offsets of these fields */ /* XXX P3 Is it? */
  16 typedef struct {
  17         unsigned int __softirq_pending;
  18 } ____cacheline_aligned irq_cpustat_t;
  19
  20 #include <linux/irq_cpustat.h>  /* Standard mappings for irq_cpustat_t above */
  21
  22 /*
  23  * We put the hardirq and softirq counter into the preemption
  24  * counter. The bitmask has the following meaning:
  25  *
  26  * - bits 0-7 are the preemption count (max preemption depth: 256)
  27  * - bits 8-15 are the softirq count (max # of softirqs: 256)
  28  * - bits 16-23 are the hardirq count (max # of hardirqs: 256)
  29  *
  30  * - ( bit 26 is the PREEMPT_ACTIVE flag. )
  31  *
  32  * PREEMPT_MASK: 0x000000ff
  33  * SOFTIRQ_MASK: 0x0000ff00
  34  * HARDIRQ_MASK: 0x00ff0000
  35  */
  36
  37 #define PREEMPT_BITS    8
  38 #define SOFTIRQ_BITS    8
  39 #define HARDIRQ_BITS    8
  40
  41 #define PREEMPT_SHIFT   0
  42 #define SOFTIRQ_SHIFT   (PREEMPT_SHIFT + PREEMPT_BITS)
  43 #define HARDIRQ_SHIFT   (SOFTIRQ_SHIFT + SOFTIRQ_BITS)
  44
  45 #define irq_enter()             (preempt_count() += HARDIRQ_OFFSET)
  46 #define irq_exit()                                                      \
  47 do {                                                                    \
  48                 preempt_count() -= IRQ_EXIT_OFFSET;                     \
  49                 if (!in_interrupt() && softirq_pending(smp_processor_id())) \
  50                         do_softirq();                                   \
  51                 preempt_enable_no_resched();                            \
  52 } while (0)
  53
  54 #endif /* __SPARC_HARDIRQ_H */