include/asm-ppc64/hardirq.h

   1 #ifndef __ASM_HARDIRQ_H
   2 #define __ASM_HARDIRQ_H
   3
   4 /*
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version
   8  * 2 of the License, or (at your option) any later version.
   9  */
  10
  11 #include <linux/config.h>
  12 #include <linux/cache.h>
  13 #include <linux/preempt.h>
  14
  15 typedef struct {
  16         unsigned int __softirq_pending;
  17         struct task_struct * __ksoftirqd_task;
  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 16-24 are the hardirq count (max # of hardirqs: 512)
  29  *
  30  * - ( bit 26 is the PREEMPT_ACTIVE flag. )
  31  *
  32  * PREEMPT_MASK: 0x000000ff
  33  * SOFTIRQ_MASK: 0x0000ff00
  34  * HARDIRQ_MASK: 0x01ff0000
  35  */
  36
  37 #define PREEMPT_BITS    8
  38 #define SOFTIRQ_BITS    8
  39 #define HARDIRQ_BITS    9
  40
  41 #define PREEMPT_SHIFT   0
  42 #define SOFTIRQ_SHIFT   (PREEMPT_SHIFT + PREEMPT_BITS)
  43 #define HARDIRQ_SHIFT   (SOFTIRQ_SHIFT + SOFTIRQ_BITS)
  44
  45 /*
  46  * The hardirq mask has to be large enough to have
  47  * space for potentially all IRQ sources in the system
  48  * nesting on a single CPU:
  49  */
  50 #if (1 << HARDIRQ_BITS) < NR_IRQS
  51 # error HARDIRQ_BITS is too low!
  52 #endif
  53
  54 #define irq_enter()             (preempt_count() += HARDIRQ_OFFSET)
  55 #define irq_exit()                                                      \
  56 do {                                                                    \
  57                 preempt_count() -= IRQ_EXIT_OFFSET;                     \
  58                 if (!in_interrupt() && softirq_pending(smp_processor_id())) \
  59                         do_softirq();                                   \
  60                 preempt_enable_no_resched();                            \
  61 } while (0)
  62
  63 #endif /* __ASM_HARDIRQ_H */