include/asm-cris/hardirq.h

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