ia64/linux-2.6.18-xen.hg

view arch/mips/kernel/irq.c @ 452:c7ed6fe5dca0

kexec: dont initialise regions in reserve_memory()

There is no need to initialise efi_memmap_res and boot_param_res in
reserve_memory() for the initial xen domain as it is done in
machine_kexec_setup_resources() using values from the kexec hypercall.

Signed-off-by: Simon Horman <horms@verge.net.au>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Feb 28 10:55:18 2008 +0000 (2008-02-28)
parents 831230e53067
children
line source
1 /*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Code to handle x86 style IRQs plus some generic interrupt stuff.
7 *
8 * Copyright (C) 1992 Linus Torvalds
9 * Copyright (C) 1994 - 2000 Ralf Baechle
10 */
11 #include <linux/kernel.h>
12 #include <linux/delay.h>
13 #include <linux/init.h>
14 #include <linux/interrupt.h>
15 #include <linux/kernel_stat.h>
16 #include <linux/module.h>
17 #include <linux/proc_fs.h>
18 #include <linux/slab.h>
19 #include <linux/mm.h>
20 #include <linux/random.h>
21 #include <linux/sched.h>
22 #include <linux/seq_file.h>
23 #include <linux/kallsyms.h>
25 #include <asm/atomic.h>
26 #include <asm/system.h>
27 #include <asm/uaccess.h>
29 /*
30 * 'what should we do if we get a hw irq event on an illegal vector'.
31 * each architecture has to answer this themselves.
32 */
33 void ack_bad_irq(unsigned int irq)
34 {
35 printk("unexpected IRQ # %d\n", irq);
36 }
38 atomic_t irq_err_count;
40 #ifdef CONFIG_MIPS_MT_SMTC
41 /*
42 * SMTC Kernel needs to manipulate low-level CPU interrupt mask
43 * in do_IRQ. These are passed in setup_irq_smtc() and stored
44 * in this table.
45 */
46 unsigned long irq_hwmask[NR_IRQS];
47 #endif /* CONFIG_MIPS_MT_SMTC */
49 #undef do_IRQ
51 /*
52 * do_IRQ handles all normal device IRQ's (the special
53 * SMP cross-CPU interrupts have their own specific
54 * handlers).
55 */
56 asmlinkage unsigned int do_IRQ(unsigned int irq, struct pt_regs *regs)
57 {
58 irq_enter();
60 __DO_IRQ_SMTC_HOOK();
61 __do_IRQ(irq, regs);
63 irq_exit();
65 return 1;
66 }
68 /*
69 * Generic, controller-independent functions:
70 */
72 int show_interrupts(struct seq_file *p, void *v)
73 {
74 int i = *(loff_t *) v, j;
75 struct irqaction * action;
76 unsigned long flags;
78 if (i == 0) {
79 seq_printf(p, " ");
80 for_each_online_cpu(j)
81 seq_printf(p, "CPU%d ",j);
82 seq_putc(p, '\n');
83 }
85 if (i < NR_IRQS) {
86 spin_lock_irqsave(&irq_desc[i].lock, flags);
87 action = irq_desc[i].action;
88 if (!action)
89 goto skip;
90 seq_printf(p, "%3d: ",i);
91 #ifndef CONFIG_SMP
92 seq_printf(p, "%10u ", kstat_irqs(i));
93 #else
94 for_each_online_cpu(j)
95 seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
96 #endif
97 seq_printf(p, " %14s", irq_desc[i].chip->typename);
98 seq_printf(p, " %s", action->name);
100 for (action=action->next; action; action = action->next)
101 seq_printf(p, ", %s", action->name);
103 seq_putc(p, '\n');
104 skip:
105 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
106 } else if (i == NR_IRQS) {
107 seq_putc(p, '\n');
108 seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
109 }
110 return 0;
111 }
113 asmlinkage void spurious_interrupt(struct pt_regs *regs)
114 {
115 atomic_inc(&irq_err_count);
116 }
118 #ifdef CONFIG_KGDB
119 extern void breakpoint(void);
120 extern void set_debug_traps(void);
122 static int kgdb_flag = 1;
123 static int __init nokgdb(char *str)
124 {
125 kgdb_flag = 0;
126 return 1;
127 }
128 __setup("nokgdb", nokgdb);
129 #endif
131 void __init init_IRQ(void)
132 {
133 int i;
135 for (i = 0; i < NR_IRQS; i++) {
136 irq_desc[i].status = IRQ_DISABLED;
137 irq_desc[i].action = NULL;
138 irq_desc[i].depth = 1;
139 irq_desc[i].chip = &no_irq_chip;
140 spin_lock_init(&irq_desc[i].lock);
141 #ifdef CONFIG_MIPS_MT_SMTC
142 irq_hwmask[i] = 0;
143 #endif /* CONFIG_MIPS_MT_SMTC */
144 }
146 arch_init_irq();
148 #ifdef CONFIG_KGDB
149 if (kgdb_flag) {
150 printk("Wait for gdb client connection ...\n");
151 set_debug_traps();
152 breakpoint();
153 }
154 #endif
155 }