include/asm-arm26/hardirq.h

   1 #ifndef __ASM_HARDIRQ_H
   2 #define __ASM_HARDIRQ_H
   3
   4 #include <linux/config.h>
   5 #include <linux/cache.h>
   6 #include <linux/threads.h>
   7
   8 typedef struct {
   9         unsigned int __softirq_pending;
  10         unsigned int __local_irq_count;
  11         unsigned int __local_bh_count;
  12         unsigned int __syscall_count;
  13         struct task_struct * __ksoftirqd_task; /* waitqueue is too large */
  14 } ____cacheline_aligned irq_cpustat_t;
  15
  16 #include <linux/irq_cpustat.h>  /* Standard mappings for irq_cpustat_t above */
  17
  18 /*
  19  * We put the hardirq and softirq counter into the preemption
  20  * counter.  The bitmask has the following meaning:
  21  *
  22  * - bits 0-7 are the preemption count (max depth: 256)
  23  * - bits 8-15 are the softirq count (max # of softirqs: 256)
  24  * - bits 16-23 are the hardirq count (max # of hardirqs: 256)
  25  * - bit 26 is the PREEMPT_ACTIVE flag
  26  */
  27 #define PREEMPT_BITS    8
  28 #define SOFTIRQ_BITS    8
  29 #define HARDIRQ_BITS    8
  30
  31 #define PREEMPT_SHIFT   0
  32 #define SOFTIRQ_SHIFT   (PREEMPT_SHIFT + PREEMPT_BITS)
  33 #define HARDIRQ_SHIFT   (SOFTIRQ_SHIFT + SOFTIRQ_BITS)
  34
  35 /*
  36  * The hardirq mask has to be large enough to have space
  37  * for potentially all IRQ sources in the system nesting
  38  * on a single CPU:
  39  */
  40 #if (1 << HARDIRQ_BITS) < NR_IRQS
  41 # error HARDIRQ_BITS is too low!
  42 #endif
  43
  44 #define irq_enter()             (preempt_count() += HARDIRQ_OFFSET)
  45
  46 #ifndef CONFIG_SMP
  47 #define irq_exit()                                                      \
  48         do {                                                            \
  49                 preempt_count() -= HARDIRQ_OFFSET;                      \
  50                 if (!in_interrupt() && softirq_pending(smp_processor_id())) \
  51                         __asm__("bl%? __do_softirq": : : "lr");/* out of line */\
  52                 preempt_enable_no_resched();                            \
  53         } while (0)
  54
  55 #endif
  56
  57 #endif /* __ASM_HARDIRQ_H */