This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / x86_64 / kernel / irq-xen.c

diff --git a/arch/x86_64/kernel/irq-xen.c b/arch/x86_64/kernel/irq-xen.c
new file mode 100644 (file)
index 0000000..3068ce2
--- /dev/null
+++ b/arch/x86_64/kernel/irq-xen.c
@@ -0,0 +1,163 @@
+/*
+ *     linux/arch/x86_64/kernel/irq.c
+ *
+ *     Copyright (C) 1992, 1998 Linus Torvalds, Ingo Molnar
+ *
+ * This file contains the lowest level x86_64-specific interrupt
+ * entry and irq statistics code. All the remaining irq logic is
+ * done by the generic kernel/irq/ code and in the
+ * x86_64-specific irq controller code. (e.g. i8259.c and
+ * io_apic.c.)
+ */
+
+#include <linux/kernel_stat.h>
+#include <linux/interrupt.h>
+#include <linux/seq_file.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <asm/uaccess.h>
+#include <asm/io_apic.h>
+#include <asm/idle.h>
+
+atomic_t irq_err_count;
+#ifdef CONFIG_X86_IO_APIC
+#ifdef APIC_MISMATCH_DEBUG
+atomic_t irq_mis_count;
+#endif
+#endif
+
+/*
+ * Generic, controller-independent functions:
+ */
+
+int show_interrupts(struct seq_file *p, void *v)
+{
+       int i = *(loff_t *) v, j;
+       struct irqaction * action;
+       unsigned long flags;
+
+       if (i == 0) {
+               seq_printf(p, "           ");
+               for_each_online_cpu(j)
+                       seq_printf(p, "CPU%d       ",j);
+               seq_putc(p, '\n');
+       }
+
+       if (i < NR_IRQS) {
+               spin_lock_irqsave(&irq_desc[i].lock, flags);
+               action = irq_desc[i].action;
+               if (!action) 
+                       goto skip;
+               seq_printf(p, "%3d: ",i);
+#ifndef CONFIG_SMP
+               seq_printf(p, "%10u ", kstat_irqs(i));
+#else
+               for_each_online_cpu(j)
+                       seq_printf(p, "%10u ", kstat_cpu(j).irqs[i]);
+#endif
+               seq_printf(p, " %14s", irq_desc[i].handler->typename);
+
+               seq_printf(p, "  %s", action->name);
+               for (action=action->next; action; action = action->next)
+                       seq_printf(p, ", %s", action->name);
+               seq_putc(p, '\n');
+skip:
+               spin_unlock_irqrestore(&irq_desc[i].lock, flags);
+       } else if (i == NR_IRQS) {
+               seq_printf(p, "NMI: ");
+               for_each_online_cpu(j)
+                       seq_printf(p, "%10u ", cpu_pda(j)->__nmi_count);
+               seq_putc(p, '\n');
+#ifdef CONFIG_X86_LOCAL_APIC
+               seq_printf(p, "LOC: ");
+               for_each_online_cpu(j)
+                       seq_printf(p, "%10u ", cpu_pda(j)->apic_timer_irqs);
+               seq_putc(p, '\n');
+#endif
+               seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
+#ifdef CONFIG_X86_IO_APIC
+#ifdef APIC_MISMATCH_DEBUG
+               seq_printf(p, "MIS: %10u\n", atomic_read(&irq_mis_count));
+#endif
+#endif
+       }
+       return 0;
+}
+
+/*
+ * do_IRQ handles all normal device IRQ's (the special
+ * SMP cross-CPU interrupts have their own specific
+ * handlers).
+ */
+asmlinkage unsigned int do_IRQ(struct pt_regs *regs)
+{      
+       /* high bit used in ret_from_ code  */
+       unsigned irq = ~regs->orig_rax;
+
+       exit_idle();
+       irq_enter();
+
+       __do_IRQ(irq, regs);
+       irq_exit();
+
+       return 1;
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+void fixup_irqs(cpumask_t map)
+{
+       unsigned int irq;
+       static int warned;
+
+       for (irq = 0; irq < NR_IRQS; irq++) {
+               cpumask_t mask;
+               if (irq == 2)
+                       continue;
+
+               cpus_and(mask, irq_affinity[irq], map);
+               if (any_online_cpu(mask) == NR_CPUS) {
+                       printk("Breaking affinity for irq %i\n", irq);
+                       mask = map;
+               }
+               if (irq_desc[irq].handler->set_affinity)
+                       irq_desc[irq].handler->set_affinity(irq, mask);
+               else if (irq_desc[irq].action && !(warned++))
+                       printk("Cannot set affinity for irq %i\n", irq);
+       }
+
+       /* That doesn't seem sufficient.  Give it 1ms. */
+       local_irq_enable();
+       mdelay(1);
+       local_irq_disable();
+}
+#endif
+
+extern void call_softirq(void);
+
+asmlinkage void do_softirq(void)
+{
+       __u32 pending;
+       unsigned long flags;
+
+       if (in_interrupt())
+               return;
+
+       local_irq_save(flags);
+       pending = local_softirq_pending();
+       /* Switch to interrupt stack */
+       if (pending)
+               call_softirq();
+       local_irq_restore(flags);
+}
+EXPORT_SYMBOL(do_softirq);
+
+#ifndef CONFIG_X86_LOCAL_APIC
+/*
+ * 'what should we do if we get a hw irq event on an illegal vector'.
+ * each architecture has to answer this themselves.
+ */
+void ack_bad_irq(unsigned int irq)
+{
+        printk("unexpected IRQ trap at vector %02x\n", irq);
+}
+#endif