ia64/xen-unstable

view linux-2.6-xen-sparse/arch/x86_64/kernel/irq-xen.c @ 9555:d76a7a40f3a9

Fix do_IRQ high bit masking.
Instead of setting the highest bit (which isn't easily done on native x86_64),
negate the interrupt vector stored in orig_{e,r}ax.
Also add patch for native build.

Signed-off-by: Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
author cl349@firebug.cl.cam.ac.uk
date Fri Mar 31 17:44:26 2006 +0100 (2006-03-31)
parents 4109c4e7804a
children 4fad820a2233
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 */
13 #include <linux/kernel_stat.h>
14 #include <linux/interrupt.h>
15 #include <linux/seq_file.h>
16 #include <linux/module.h>
17 #include <linux/delay.h>
18 #include <asm/uaccess.h>
19 #include <asm/io_apic.h>
20 #include <asm/idle.h>
22 atomic_t irq_err_count;
23 #ifdef CONFIG_X86_IO_APIC
24 #ifdef APIC_MISMATCH_DEBUG
25 atomic_t irq_mis_count;
26 #endif
27 #endif
29 /*
30 * Generic, controller-independent functions:
31 */
33 int show_interrupts(struct seq_file *p, void *v)
34 {
35 int i = *(loff_t *) v, j;
36 struct irqaction * action;
37 unsigned long flags;
39 if (i == 0) {
40 seq_printf(p, " ");
41 for (j=0; j<NR_CPUS; j++)
42 if (cpu_online(j))
43 seq_printf(p, "CPU%d ",j);
44 seq_putc(p, '\n');
45 }
47 if (i < NR_IRQS) {
48 spin_lock_irqsave(&irq_desc[i].lock, flags);
49 action = irq_desc[i].action;
50 if (!action)
51 goto skip;
52 seq_printf(p, "%3d: ",i);
53 #ifndef CONFIG_SMP
54 seq_printf(p, "%10u ", kstat_irqs(i));
55 #else
56 for (j=0; j<NR_CPUS; j++)
57 if (cpu_online(j))
58 seq_printf(p, "%10u ",
59 kstat_cpu(j).irqs[i]);
60 #endif
61 seq_printf(p, " %14s", irq_desc[i].handler->typename);
63 seq_printf(p, " %s", action->name);
64 for (action=action->next; action; action = action->next)
65 seq_printf(p, ", %s", action->name);
66 seq_putc(p, '\n');
67 skip:
68 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
69 } else if (i == NR_IRQS) {
70 seq_printf(p, "NMI: ");
71 for (j = 0; j < NR_CPUS; j++)
72 if (cpu_online(j))
73 seq_printf(p, "%10u ", cpu_pda(j)->__nmi_count);
74 seq_putc(p, '\n');
75 #ifdef CONFIG_X86_LOCAL_APIC
76 seq_printf(p, "LOC: ");
77 for (j = 0; j < NR_CPUS; j++)
78 if (cpu_online(j))
79 seq_printf(p, "%10u ", cpu_pda(j)->apic_timer_irqs);
80 seq_putc(p, '\n');
81 #endif
82 seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
83 #ifdef CONFIG_X86_IO_APIC
84 #ifdef APIC_MISMATCH_DEBUG
85 seq_printf(p, "MIS: %10u\n", atomic_read(&irq_mis_count));
86 #endif
87 #endif
88 }
89 return 0;
90 }
92 /*
93 * do_IRQ handles all normal device IRQ's (the special
94 * SMP cross-CPU interrupts have their own specific
95 * handlers).
96 */
97 asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
98 {
99 /* high bit used in ret_from_ code */
100 unsigned irq = ~regs->orig_rax;
102 exit_idle();
103 irq_enter();
105 __do_IRQ(irq, regs);
106 irq_exit();
108 return 1;
109 }
111 #ifdef CONFIG_HOTPLUG_CPU
112 void fixup_irqs(cpumask_t map)
113 {
114 unsigned int irq;
115 static int warned;
117 for (irq = 0; irq < NR_IRQS; irq++) {
118 cpumask_t mask;
119 if (irq == 2)
120 continue;
122 cpus_and(mask, irq_affinity[irq], map);
123 if (any_online_cpu(mask) == NR_CPUS) {
124 printk("Breaking affinity for irq %i\n", irq);
125 mask = map;
126 }
127 if (irq_desc[irq].handler->set_affinity)
128 irq_desc[irq].handler->set_affinity(irq, mask);
129 else if (irq_desc[irq].action && !(warned++))
130 printk("Cannot set affinity for irq %i\n", irq);
131 }
133 /* That doesn't seem sufficient. Give it 1ms. */
134 local_irq_enable();
135 mdelay(1);
136 local_irq_disable();
137 }
138 #endif
140 extern void call_softirq(void);
142 asmlinkage void do_softirq(void)
143 {
144 __u32 pending;
145 unsigned long flags;
147 if (in_interrupt())
148 return;
150 local_irq_save(flags);
151 pending = local_softirq_pending();
152 /* Switch to interrupt stack */
153 if (pending)
154 call_softirq();
155 local_irq_restore(flags);
156 }
157 EXPORT_SYMBOL(do_softirq);
159 #ifndef CONFIG_X86_LOCAL_APIC
160 /*
161 * 'what should we do if we get a hw irq event on an illegal vector'.
162 * each architecture has to answer this themselves.
163 */
164 void ack_bad_irq(unsigned int irq)
165 {
166 printk("unexpected IRQ trap at vector %02x\n", irq);
167 }
168 #endif