include/linux/hardirq.h

   1 #ifndef LINUX_HARDIRQ_H
   2 #define LINUX_HARDIRQ_H
   3
   4 #include <linux/config.h>
   5 #include <linux/smp_lock.h>
   6 #include <asm/hardirq.h>
   7
   8 #define __IRQ_MASK(x)   ((1UL << (x))-1)
   9
  10 #define PREEMPT_MASK    (__IRQ_MASK(PREEMPT_BITS) << PREEMPT_SHIFT)
  11 #define HARDIRQ_MASK    (__IRQ_MASK(HARDIRQ_BITS) << HARDIRQ_SHIFT)
  12 #define SOFTIRQ_MASK    (__IRQ_MASK(SOFTIRQ_BITS) << SOFTIRQ_SHIFT)
  13
  14 #define PREEMPT_OFFSET  (1UL << PREEMPT_SHIFT)
  15 #define SOFTIRQ_OFFSET  (1UL << SOFTIRQ_SHIFT)
  16 #define HARDIRQ_OFFSET  (1UL << HARDIRQ_SHIFT)
  17
  18 #define hardirq_count() (preempt_count() & HARDIRQ_MASK)
  19 #define softirq_count() (preempt_count() & SOFTIRQ_MASK)
  20 #define irq_count()     (preempt_count() & (HARDIRQ_MASK | SOFTIRQ_MASK))
  21
  22 /*
  23  * Are we doing bottom half or hardware interrupt processing?
  24  * Are we in a softirq context? Interrupt context?
  25  */
  26 #define in_irq()                (hardirq_count())
  27 #define in_softirq()            (softirq_count())
  28 #define in_interrupt()          (irq_count())
  29
  30 #ifdef CONFIG_PREEMPT
  31 # define in_atomic()    ((preempt_count() & ~PREEMPT_ACTIVE) != kernel_locked())
  32 # define preemptible()  (preempt_count() == 0 && !irqs_disabled())
  33 # define IRQ_EXIT_OFFSET (HARDIRQ_OFFSET-1)
  34 #else
  35 # define in_atomic()    (preempt_count() != 0)
  36 # define preemptible()  0
  37 # define IRQ_EXIT_OFFSET HARDIRQ_OFFSET
  38 #endif
  39
  40 #ifdef CONFIG_SMP
  41 extern void synchronize_irq(unsigned int irq);
  42 #else
  43 # define synchronize_irq(irq)   barrier()
  44 #endif
  45
  46 #endif /* LINUX_HARDIRQ_H */