/* $Id: irq.c,v 1.20 2004/01/13 05:52:11 kkojima Exp $ * * linux/arch/sh/kernel/irq.c * * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar * * * SuperH version: Copyright (C) 1999 Niibe Yutaka */ #include #include #include #include #include #include #include /* * 'what should we do if we get a hw irq event on an illegal vector'. * each architecture has to answer this themselves, it doesn't deserve * a generic callback i think. */ void ack_bad_irq(unsigned int irq) { printk("unexpected IRQ trap at vector %02x\n", irq); } #if defined(CONFIG_PROC_FS) int show_interrupts(struct seq_file *p, void *v) { int i = *(loff_t *) v, j; struct irqaction * action; unsigned long flags; if (i == 0) { seq_puts(p, " "); for_each_online_cpu(j) seq_printf(p, "CPU%d ",j); seq_putc(p, '\n'); } if (i < NR_IRQS) { spin_lock_irqsave(&irq_desc[i].lock, flags); action = irq_desc[i].action; if (!action) goto unlock; seq_printf(p, "%3d: ",i); seq_printf(p, "%10u ", kstat_irqs(i)); seq_printf(p, " %14s", irq_desc[i].chip->typename); seq_printf(p, " %s", action->name); for (action=action->next; action; action = action->next) seq_printf(p, ", %s", action->name); seq_putc(p, '\n'); unlock: spin_unlock_irqrestore(&irq_desc[i].lock, flags); } return 0; } #endif asmlinkage int do_IRQ(unsigned long r4, unsigned long r5, unsigned long r6, unsigned long r7, struct pt_regs regs) { int irq = r4; irq_enter(); #ifdef CONFIG_DEBUG_STACKOVERFLOW /* Debugging check for stack overflow: is there less than 1KB free? */ { long sp; __asm__ __volatile__ ("and r15, %0" : "=r" (sp) : "0" (THREAD_SIZE - 1)); if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) { printk("do_IRQ: stack overflow: %ld\n", sp - sizeof(struct thread_info)); dump_stack(); } } #endif #ifdef CONFIG_CPU_HAS_INTEVT __asm__ __volatile__ ( #ifdef CONFIG_CPU_HAS_SR_RB "stc r2_bank, %0\n\t" #else "mov.l @%1, %0\n\t" #endif "shlr2 %0\n\t" "shlr2 %0\n\t" "shlr %0\n\t" "add #-16, %0\n\t" : "=z" (irq), "=r" (r4) : "1" (INTEVT) : "memory" ); #endif irq = irq_demux(irq); __do_IRQ(irq, ®s); irq_exit(); return 1; }