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1da177e4 LT |
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 | } |