include/asm-mips/hardirq.h

   1 /* $Id: hardirq.h,v 1.8 2000/03/02 02:37:13 ralf Exp $
   2  *
   3  * This file is subject to the terms and conditions of the GNU General Public
   4  * License.  See the file "COPYING" in the main directory of this archive
   5  * for more details.
   6  *
   7  * Copyright (C) 1997, 1998, 1999, 2000 by Ralf Baechle
   8  * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
   9  */
  10 #ifndef _ASM_HARDIRQ_H
  11 #define _ASM_HARDIRQ_H
  12
  13 #include <linux/config.h>
  14 #include <linux/threads.h>
  15 #include <linux/irq.h>
  16
  17 typedef struct {
  18         unsigned int __local_irq_count;
  19         unsigned int __local_bh_count;
  20 } ____cacheline_aligned irq_cpustat_t;
  21
  22 extern irq_cpustat_t irq_stat [NR_CPUS];
  23
  24 /*
  25  * Simple wrappers reducing source bloat
  26  */
  27 #define local_irq_count(cpu) (irq_stat[(cpu)].__local_irq_count)
  28 #define local_bh_count(cpu) (irq_stat[(cpu)].__local_bh_count)
  29
  30 /*
  31  * Are we in an interrupt context? Either doing bottom half
  32  * or hardware interrupt processing?
  33  */
  34 #define in_interrupt() ({ int __cpu = smp_processor_id(); \
  35         (local_irq_count(__cpu) + local_bh_count(__cpu) != 0); })
  36 #define in_irq() (local_irq_count(smp_processor_id()) != 0)
  37
  38 #ifndef CONFIG_SMP
  39
  40 #define hardirq_trylock(cpu)    (local_irq_count(cpu) == 0)
  41 #define hardirq_endlock(cpu)    do { } while (0)
  42
  43 #define irq_enter(cpu)          (local_irq_count(cpu)++)
  44 #define irq_exit(cpu)           (local_irq_count(cpu)--)
  45
  46 #define synchronize_irq()       barrier();
  47
  48 #else
  49
  50 #error No habla MIPS SMP
  51
  52 #endif /* CONFIG_SMP */
  53 #endif /* _ASM_HARDIRQ_H */