Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* $Id: irq.c,v 1.20 2004/01/13 05:52:11 kkojima Exp $ |
| 2 | * |
| 3 | * linux/arch/sh/kernel/irq.c |
| 4 | * |
| 5 | * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar |
| 6 | * |
| 7 | * |
| 8 | * SuperH version: Copyright (C) 1999 Niibe Yutaka |
| 9 | */ |
| 10 | |
| 11 | /* |
| 12 | * IRQs are in fact implemented a bit like signal handlers for the kernel. |
| 13 | * Naturally it's not a 1:1 relation, but there are similarities. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/config.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/ptrace.h> |
| 19 | #include <linux/errno.h> |
| 20 | #include <linux/kernel_stat.h> |
| 21 | #include <linux/signal.h> |
| 22 | #include <linux/sched.h> |
| 23 | #include <linux/ioport.h> |
| 24 | #include <linux/interrupt.h> |
| 25 | #include <linux/timex.h> |
| 26 | #include <linux/mm.h> |
| 27 | #include <linux/slab.h> |
| 28 | #include <linux/random.h> |
| 29 | #include <linux/smp.h> |
| 30 | #include <linux/smp_lock.h> |
| 31 | #include <linux/init.h> |
| 32 | #include <linux/seq_file.h> |
| 33 | #include <linux/kallsyms.h> |
| 34 | #include <linux/bitops.h> |
| 35 | |
| 36 | #include <asm/system.h> |
| 37 | #include <asm/io.h> |
| 38 | #include <asm/pgalloc.h> |
| 39 | #include <asm/delay.h> |
| 40 | #include <asm/irq.h> |
| 41 | #include <linux/irq.h> |
| 42 | |
| 43 | |
| 44 | /* |
| 45 | * 'what should we do if we get a hw irq event on an illegal vector'. |
| 46 | * each architecture has to answer this themselves, it doesn't deserve |
| 47 | * a generic callback i think. |
| 48 | */ |
| 49 | void ack_bad_irq(unsigned int irq) |
| 50 | { |
| 51 | printk("unexpected IRQ trap at vector %02x\n", irq); |
| 52 | } |
| 53 | |
| 54 | #if defined(CONFIG_PROC_FS) |
| 55 | int show_interrupts(struct seq_file *p, void *v) |
| 56 | { |
| 57 | int i = *(loff_t *) v, j; |
| 58 | struct irqaction * action; |
| 59 | unsigned long flags; |
| 60 | |
| 61 | if (i == 0) { |
| 62 | seq_puts(p, " "); |
| 63 | for (j=0; j<NR_CPUS; j++) |
| 64 | if (cpu_online(j)) |
| 65 | seq_printf(p, "CPU%d ",j); |
| 66 | seq_putc(p, '\n'); |
| 67 | } |
| 68 | |
| 69 | if (i < ACTUAL_NR_IRQS) { |
| 70 | spin_lock_irqsave(&irq_desc[i].lock, flags); |
| 71 | action = irq_desc[i].action; |
| 72 | if (!action) |
| 73 | goto unlock; |
| 74 | seq_printf(p, "%3d: ",i); |
| 75 | seq_printf(p, "%10u ", kstat_irqs(i)); |
| 76 | seq_printf(p, " %14s", irq_desc[i].handler->typename); |
| 77 | seq_printf(p, " %s", action->name); |
| 78 | |
| 79 | for (action=action->next; action; action = action->next) |
| 80 | seq_printf(p, ", %s", action->name); |
| 81 | seq_putc(p, '\n'); |
| 82 | unlock: |
| 83 | spin_unlock_irqrestore(&irq_desc[i].lock, flags); |
| 84 | } |
| 85 | return 0; |
| 86 | } |
| 87 | #endif |
| 88 | |
| 89 | asmlinkage int do_IRQ(unsigned long r4, unsigned long r5, |
| 90 | unsigned long r6, unsigned long r7, |
| 91 | struct pt_regs regs) |
| 92 | { |
| 93 | int irq; |
| 94 | |
| 95 | irq_enter(); |
| 96 | asm volatile("stc r2_bank, %0\n\t" |
| 97 | "shlr2 %0\n\t" |
| 98 | "shlr2 %0\n\t" |
| 99 | "shlr %0\n\t" |
| 100 | "add #-16, %0\n\t" |
| 101 | :"=z" (irq)); |
| 102 | irq = irq_demux(irq); |
| 103 | __do_IRQ(irq, ®s); |
| 104 | irq_exit(); |
| 105 | return 1; |
| 106 | } |