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/*
* Linux software interrupts.
* Copyright (C) 1995 Shantanu Goel.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* linux/kernel/softirq.c
*
* Copyright (C) 1992 Linus Torvalds
*/
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <asm/system.h>
#include <asm/bitops.h>
/*
* Mask of pending interrupts.
*/
unsigned long bh_active = 0;
/*
* Mask of enabled interrupts.
*/
unsigned long bh_mask = 0;
/*
* List of software interrupt handlers.
*/
struct bh_struct bh_base[32];
/*
* Software interrupt handler.
*/
void
linux_soft_intr()
{
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 == 0)
goto bad_bh;
(*fn)(bh->data);
}
}
return;
bad_bh:
printf("linux_soft_intr: bad interrupt handler entry 0x%08lx\n", mask);
}
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