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) */