Loading...
/*
* linux/kernel/softirq.c
*
* Copyright (C) 1992 Linus Torvalds
*
* do_bottom_half() runs at normal kernel priority: all interrupts
* enabled. do_bottom_half() is atomic with respect to itself: a
* bottom_half handler need not be re-entrant.
*/
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/kernel_stat.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <asm/system.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/bitops.h>
#define INCLUDE_INLINE_FUNCS
#include <linux/tqueue.h>
unsigned long intr_count = 0;
unsigned long bh_active = 0;
unsigned long bh_mask = ~0UL;
struct bh_struct bh_base[32];
asmlinkage void do_bottom_half(void)
{
unsigned long active;
unsigned long mask, left;
struct bh_struct *bh;
bh = bh_base;
active = bh_active & bh_mask;
for (mask = 1, left = ~0 ; left & active ; bh++,mask += mask,left += left) {
if (mask & active) {
void (*fn)(void *);
bh_active &= ~mask;
fn = bh->routine;
if (!fn)
goto bad_bh;
fn(bh->data);
}
}
return;
bad_bh:
printk ("irq.c:bad bottom half entry %08lx\n", mask);
}
|