include/asm-s390/hardirq.h

   1 /*
   2  *  include/asm-s390/hardirq.h
   3  *
   4  *  S390 version
   5  *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
   6  *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
   7  *               Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
   8  *
   9  *  Derived from "include/asm-i386/hardirq.h"
  10  */
  11
  12 #ifndef __ASM_HARDIRQ_H
  13 #define __ASM_HARDIRQ_H
  14
  15 #include <linux/config.h>
  16 #include <linux/threads.h>
  17 #include <linux/sched.h>
  18 #include <linux/cache.h>
  19 #include <asm/lowcore.h>
  20
  21 /* irq_cpustat_t is unused currently, but could be converted
  22  * into a percpu variable instead of storing softirq_pending
  23  * on the lowcore */
  24 typedef struct {
  25         unsigned int __softirq_pending;
  26 } irq_cpustat_t;
  27
  28 #define local_softirq_pending() (S390_lowcore.softirq_pending)
  29
  30 /* this is always called with cpu == smp_processor_id() at the moment */
  31 static inline __u32
  32 softirq_pending(unsigned int cpu)
  33 {
  34         if (cpu == smp_processor_id())
  35                 return local_softirq_pending();
  36         return lowcore_ptr[cpu]->softirq_pending;
  37 }
  38
  39 #define __ARCH_IRQ_STAT
  40
  41 #define HARDIRQ_BITS    8
  42
  43 extern void account_ticks(struct pt_regs *);
  44
  45 #define __ARCH_HAS_DO_SOFTIRQ
  46
  47 #define irq_enter()                                                     \
  48 do {                                                                    \
  49         (preempt_count() += HARDIRQ_OFFSET);                            \
  50 } while(0)
  51 #define irq_exit()                                                      \
  52 do {                                                                    \
  53         preempt_count() -= IRQ_EXIT_OFFSET;                             \
  54         if (!in_interrupt() && local_softirq_pending())                 \
  55                 /* Use the async. stack for softirq */                  \
  56                 do_softirq();                                           \
  57         preempt_enable_no_resched();                                    \
  58 } while (0)
  59
  60 #endif /* __ASM_HARDIRQ_H */