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107 lines
2.4 KiB
107 lines
2.4 KiB
20 years ago
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/* $Id: irq.c,v 1.20 2004/01/13 05:52:11 kkojima Exp $
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*
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* linux/arch/sh/kernel/irq.c
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*
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* Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
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*
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*
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* SuperH version: Copyright (C) 1999 Niibe Yutaka
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*/
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/*
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* IRQs are in fact implemented a bit like signal handlers for the kernel.
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* Naturally it's not a 1:1 relation, but there are similarities.
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/ptrace.h>
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#include <linux/errno.h>
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#include <linux/kernel_stat.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/ioport.h>
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#include <linux/interrupt.h>
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#include <linux/timex.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/random.h>
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#include <linux/smp.h>
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#include <linux/smp_lock.h>
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#include <linux/init.h>
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#include <linux/seq_file.h>
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#include <linux/kallsyms.h>
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#include <linux/bitops.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <asm/pgalloc.h>
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#include <asm/delay.h>
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#include <asm/irq.h>
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#include <linux/irq.h>
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/*
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* 'what should we do if we get a hw irq event on an illegal vector'.
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* each architecture has to answer this themselves, it doesn't deserve
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* a generic callback i think.
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*/
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void ack_bad_irq(unsigned int irq)
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{
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printk("unexpected IRQ trap at vector %02x\n", irq);
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}
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#if defined(CONFIG_PROC_FS)
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int show_interrupts(struct seq_file *p, void *v)
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{
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int i = *(loff_t *) v, j;
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struct irqaction * action;
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unsigned long flags;
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if (i == 0) {
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seq_puts(p, " ");
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for (j=0; j<NR_CPUS; j++)
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if (cpu_online(j))
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seq_printf(p, "CPU%d ",j);
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seq_putc(p, '\n');
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}
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if (i < ACTUAL_NR_IRQS) {
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spin_lock_irqsave(&irq_desc[i].lock, flags);
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action = irq_desc[i].action;
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if (!action)
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goto unlock;
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seq_printf(p, "%3d: ",i);
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seq_printf(p, "%10u ", kstat_irqs(i));
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seq_printf(p, " %14s", irq_desc[i].handler->typename);
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seq_printf(p, " %s", action->name);
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for (action=action->next; action; action = action->next)
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seq_printf(p, ", %s", action->name);
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seq_putc(p, '\n');
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unlock:
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spin_unlock_irqrestore(&irq_desc[i].lock, flags);
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}
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return 0;
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}
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#endif
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asmlinkage int do_IRQ(unsigned long r4, unsigned long r5,
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unsigned long r6, unsigned long r7,
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struct pt_regs regs)
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{
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int irq;
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irq_enter();
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asm volatile("stc r2_bank, %0\n\t"
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"shlr2 %0\n\t"
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"shlr2 %0\n\t"
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"shlr %0\n\t"
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"add #-16, %0\n\t"
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:"=z" (irq));
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irq = irq_demux(irq);
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__do_IRQ(irq, ®s);
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irq_exit();
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return 1;
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}
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