include/asm-mips/hardirq.h

   1 /* $Id: hardirq.h,v 1.5 1998/08/29 21:20:21 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 by Ralf Baechle
   8  */
   9 #ifndef __ASM_MIPS_HARDIRQ_H
  10 #define __ASM_MIPS_HARDIRQ_H
  11
  12 #include <linux/threads.h>
  13
  14 extern unsigned int local_irq_count[NR_CPUS];
  15
  16 /*
  17  * Are we in an interrupt context? Either doing bottom half
  18  * or hardware interrupt processing?
  19  */
  20 #define in_interrupt() ({ int __cpu = smp_processor_id(); \
  21         (local_irq_count[__cpu] + local_bh_count[__cpu] != 0); })
  22
  23 #ifndef __SMP__
  24
  25 #define hardirq_trylock(cpu)    (local_irq_count[cpu] == 0)
  26 #define hardirq_endlock(cpu)    do { } while (0)
  27
  28 #define hardirq_enter(cpu)      (local_irq_count[cpu]++)
  29 #define hardirq_exit(cpu)       (local_irq_count[cpu]--)
  30
  31 #define synchronize_irq()       barrier();
  32
  33 #else
  34
  35 #error No habla MIPS SMP
  36
  37 #endif /* __SMP__ */
  38 #endif /* __ASM_MIPS_HARDIRQ_H */