ia64/xen-unstable

view linux-2.6-xen-sparse/arch/xen/x86_64/kernel/irq.c @ 6538:84ee014ebd41

Merge xen-vtx-unstable.hg
author adsharma@los-vmm.sc.intel.com
date Wed Aug 17 12:34:38 2005 -0800 (2005-08-17)
parents 23979fb12c49 d95ea17567c6
children 99914b54f7bf
line source
1 /*
2 * linux/arch/x86_64/kernel/irq.c
3 *
4 * Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
5 *
6 * This file contains the lowest level x86_64-specific interrupt
7 * entry and irq statistics code. All the remaining irq logic is
8 * done by the generic kernel/irq/ code and in the
9 * x86_64-specific irq controller code. (e.g. i8259.c and
10 * io_apic.c.)
11 */
12 #include <asm/uaccess.h>
13 #include <linux/module.h>
14 #include <linux/seq_file.h>
15 #include <linux/interrupt.h>
16 #include <linux/kernel_stat.h>
18 /*
19 * Interrupt statistics:
20 */
22 atomic_t irq_err_count;
24 #ifdef CONFIG_X86_IO_APIC
25 #ifdef APIC_MISMATCH_DEBUG
26 atomic_t irq_mis_count;
27 #endif
28 #endif
30 /*
31 * Generic, controller-independent functions:
32 */
34 int show_interrupts(struct seq_file *p, void *v)
35 {
36 int i = *(loff_t *) v, j;
37 struct irqaction * action;
38 unsigned long flags;
40 if (i == 0) {
41 seq_printf(p, " ");
42 for (j=0; j<NR_CPUS; j++)
43 if (cpu_online(j))
44 seq_printf(p, "CPU%d ",j);
45 seq_putc(p, '\n');
46 }
48 if (i < NR_IRQS) {
49 spin_lock_irqsave(&irq_desc[i].lock, flags);
50 action = irq_desc[i].action;
51 if (!action)
52 goto skip;
53 seq_printf(p, "%3d: ",i);
54 #ifndef CONFIG_SMP
55 seq_printf(p, "%10u ", kstat_irqs(i));
56 #else
57 for (j=0; j<NR_CPUS; j++)
58 if (cpu_online(j))
59 seq_printf(p, "%10u ",
60 kstat_cpu(j).irqs[i]);
61 #endif
62 seq_printf(p, " %14s", irq_desc[i].handler->typename);
64 seq_printf(p, " %s", action->name);
65 for (action=action->next; action; action = action->next)
66 seq_printf(p, ", %s", action->name);
67 seq_putc(p, '\n');
68 skip:
69 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
70 } else if (i == NR_IRQS) {
71 seq_printf(p, "NMI: ");
72 for (j = 0; j < NR_CPUS; j++)
73 if (cpu_online(j))
74 seq_printf(p, "%10u ", cpu_pda[j].__nmi_count);
75 seq_putc(p, '\n');
76 #ifdef CONFIG_X86_LOCAL_APIC
77 seq_printf(p, "LOC: ");
78 for (j = 0; j < NR_CPUS; j++)
79 if (cpu_online(j))
80 seq_printf(p, "%10u ", cpu_pda[j].apic_timer_irqs);
81 seq_putc(p, '\n');
82 #endif
83 seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
84 #ifdef CONFIG_X86_IO_APIC
85 #ifdef APIC_MISMATCH_DEBUG
86 seq_printf(p, "MIS: %10u\n", atomic_read(&irq_mis_count));
87 #endif
88 #endif
89 }
90 return 0;
91 }
93 /*
94 * do_IRQ handles all normal device IRQ's (the special
95 * SMP cross-CPU interrupts have their own specific
96 * handlers).
97 */
98 asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
99 {
100 /* high bits used in ret_from_ code */
101 int irq = regs->orig_rax & __IRQ_MASK(HARDIRQ_BITS);
103 irq_enter();
105 __do_IRQ(irq, regs);
106 irq_exit();
108 return 1;
109 }