include/asm-m32r/hardirq.h

   1 #ifndef __ASM_HARDIRQ_H
   2 #define __ASM_HARDIRQ_H
   3
   4 #include <linux/config.h>
   5 #include <linux/threads.h>
   6 #include <linux/irq.h>
   7
   8 typedef struct {
   9         unsigned int __softirq_pending;
  10         unsigned int __syscall_count;
  11         struct task_struct * __ksoftirqd_task; /* waitqueue is too large */
  12 } ____cacheline_aligned irq_cpustat_t;
  13
  14 #include <linux/irq_cpustat.h>  /* Standard mappings for irq_cpustat_t above */
  15
  16 /*
  17  * We put the hardirq and softirq counter into the preemption
  18  * counter. The bitmask has the following meaning:
  19  *
  20  * - bits 0-7 are the preemption count (max preemption depth: 256)
  21  * - bits 8-15 are the softirq count (max # of softirqs: 256)
  22  * - bits 16-23 are the hardirq count (max # of hardirqs: 256)
  23  *
  24  * - ( bit 26 is the PREEMPT_ACTIVE flag. )
  25  *
  26  * PREEMPT_MASK: 0x000000ff
  27  * SOFTIRQ_MASK: 0x0000ff00
  28  * HARDIRQ_MASK: 0x00ff0000
  29  */
  30
  31 #define PREEMPT_BITS    8
  32 #define SOFTIRQ_BITS    8
  33
  34 #if NR_IRQS > 256
  35 #define HARDIRQ_BITS    9
  36 #else
  37 #define HARDIRQ_BITS    8
  38 #endif
  39
  40 #define PREEMPT_SHIFT   0
  41 #define SOFTIRQ_SHIFT   (PREEMPT_SHIFT + PREEMPT_BITS)
  42 #define HARDIRQ_SHIFT   (SOFTIRQ_SHIFT + SOFTIRQ_BITS)
  43
  44 /*
  45  * The hardirq mask has to be large enough to have
  46  * space for potentially all IRQ sources in the system
  47  * nesting on a single CPU:
  48  */
  49 #if (1 << HARDIRQ_BITS) < NR_IRQS
  50 # error HARDIRQ_BITS is too low!
  51 #endif
  52
  53 #define irq_enter()             (preempt_count() += HARDIRQ_OFFSET)
  54 #define nmi_enter()             (irq_enter())
  55 #define nmi_exit()              (preempt_count() -= HARDIRQ_OFFSET)
  56
  57 #define irq_exit()                                                      \
  58 do {                                                                    \
  59                 preempt_count() -= IRQ_EXIT_OFFSET;                     \
  60                 if (!in_interrupt() && softirq_pending(smp_processor_id())) \
  61                         do_softirq();                                   \
  62                 preempt_enable_no_resched();                            \
  63 } while (0)
  64
  65 #endif /* __ASM_HARDIRQ_H */