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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 | ||
bf3a00f8 | 11 | #include <linux/irq.h> |
1da177e4 | 12 | #include <linux/interrupt.h> |
bf3a00f8 | 13 | #include <linux/kernel_stat.h> |
1da177e4 | 14 | #include <linux/seq_file.h> |
1da177e4 | 15 | #include <asm/irq.h> |
bf3a00f8 PM |
16 | #include <asm/processor.h> |
17 | #include <asm/cpu/mmu_context.h> | |
1da177e4 LT |
18 | |
19 | /* | |
20 | * 'what should we do if we get a hw irq event on an illegal vector'. | |
21 | * each architecture has to answer this themselves, it doesn't deserve | |
22 | * a generic callback i think. | |
23 | */ | |
24 | void ack_bad_irq(unsigned int irq) | |
25 | { | |
26 | printk("unexpected IRQ trap at vector %02x\n", irq); | |
27 | } | |
28 | ||
29 | #if defined(CONFIG_PROC_FS) | |
30 | int show_interrupts(struct seq_file *p, void *v) | |
31 | { | |
32 | int i = *(loff_t *) v, j; | |
33 | struct irqaction * action; | |
34 | unsigned long flags; | |
35 | ||
36 | if (i == 0) { | |
37 | seq_puts(p, " "); | |
394e3902 AM |
38 | for_each_online_cpu(j) |
39 | seq_printf(p, "CPU%d ",j); | |
1da177e4 LT |
40 | seq_putc(p, '\n'); |
41 | } | |
42 | ||
bf3a00f8 | 43 | if (i < NR_IRQS) { |
1da177e4 LT |
44 | spin_lock_irqsave(&irq_desc[i].lock, flags); |
45 | action = irq_desc[i].action; | |
46 | if (!action) | |
47 | goto unlock; | |
48 | seq_printf(p, "%3d: ",i); | |
49 | seq_printf(p, "%10u ", kstat_irqs(i)); | |
d1bef4ed | 50 | seq_printf(p, " %14s", irq_desc[i].chip->typename); |
1da177e4 LT |
51 | seq_printf(p, " %s", action->name); |
52 | ||
53 | for (action=action->next; action; action = action->next) | |
54 | seq_printf(p, ", %s", action->name); | |
55 | seq_putc(p, '\n'); | |
56 | unlock: | |
57 | spin_unlock_irqrestore(&irq_desc[i].lock, flags); | |
58 | } | |
59 | return 0; | |
60 | } | |
61 | #endif | |
62 | ||
63 | asmlinkage int do_IRQ(unsigned long r4, unsigned long r5, | |
64 | unsigned long r6, unsigned long r7, | |
65 | struct pt_regs regs) | |
bf3a00f8 PM |
66 | { |
67 | int irq = r4; | |
1da177e4 LT |
68 | |
69 | irq_enter(); | |
bf3a00f8 | 70 | |
d153ea88 PM |
71 | #ifdef CONFIG_DEBUG_STACKOVERFLOW |
72 | /* Debugging check for stack overflow: is there less than 1KB free? */ | |
73 | { | |
74 | long sp; | |
75 | ||
76 | __asm__ __volatile__ ("and r15, %0" : | |
77 | "=r" (sp) : "0" (THREAD_SIZE - 1)); | |
78 | ||
79 | if (unlikely(sp < (sizeof(struct thread_info) + STACK_WARN))) { | |
80 | printk("do_IRQ: stack overflow: %ld\n", | |
81 | sp - sizeof(struct thread_info)); | |
82 | dump_stack(); | |
83 | } | |
84 | } | |
85 | #endif | |
86 | ||
bf3a00f8 PM |
87 | #ifdef CONFIG_CPU_HAS_INTEVT |
88 | __asm__ __volatile__ ( | |
89 | #ifdef CONFIG_CPU_HAS_SR_RB | |
90 | "stc r2_bank, %0\n\t" | |
91 | #else | |
92 | "mov.l @%1, %0\n\t" | |
93 | #endif | |
94 | "shlr2 %0\n\t" | |
95 | "shlr2 %0\n\t" | |
96 | "shlr %0\n\t" | |
97 | "add #-16, %0\n\t" | |
98 | : "=z" (irq), "=r" (r4) | |
99 | : "1" (INTEVT) | |
100 | : "memory" | |
101 | ); | |
102 | #endif | |
103 | ||
1da177e4 LT |
104 | irq = irq_demux(irq); |
105 | __do_IRQ(irq, ®s); | |
106 | irq_exit(); | |
107 | return 1; | |
108 | } |