root/kernel/softirq.c

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DEFINITIONS

This source file includes following definitions.
  1. do_bottom_half

   1 /*
   2  *      linux/kernel/softirq.c
   3  *
   4  *      Copyright (C) 1992 Linus Torvalds
   5  *
   6  * do_bottom_half() runs at normal kernel priority: all interrupts
   7  * enabled.  do_bottom_half() is atomic with respect to itself: a
   8  * bottom_half handler need not be re-entrant.
   9  */
  10 
  11 #include <linux/ptrace.h>
  12 #include <linux/errno.h>
  13 #include <linux/kernel_stat.h>
  14 #include <linux/signal.h>
  15 #include <linux/sched.h>
  16 #include <linux/interrupt.h>
  17 #include <linux/mm.h>
  18 
  19 #include <asm/system.h>
  20 #include <asm/io.h>
  21 #include <asm/irq.h>
  22 #include <asm/bitops.h>
  23 
  24 unsigned long intr_count = 0;
  25 
  26 int bh_mask_count[32];
  27 unsigned long bh_active = 0;
  28 unsigned long bh_mask = 0;
  29 void (*bh_base[32])(void);
  30 
  31 
  32 asmlinkage void do_bottom_half(void)
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  33 {
  34         unsigned long active;
  35         unsigned long mask, left;
  36         void (**bh)(void);
  37 
  38         sti();
  39         bh = bh_base;
  40         active = bh_active & bh_mask;
  41         for (mask = 1, left = ~0 ; left & active ; bh++,mask += mask,left += left) {
  42                 if (mask & active) {
  43                         void (*fn)(void);
  44                         bh_active &= ~mask;
  45                         fn = *bh;
  46                         if (!fn)
  47                                 goto bad_bh;
  48                         fn();
  49                 }
  50         }
  51         return;
  52 bad_bh:
  53         printk ("irq.c:bad bottom half entry %08lx\n", mask);
  54 }

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