1 files changed, 213 insertions, 0 deletions

diff --git a/arch/x86/kernel/irq_64.c b/arch/x86/kernel/irq_64.c
new file mode 100644
index 000000000000..39cb3fa83ebb
--- /dev/null
+++ b/arch/x86/kernel/irq_64.c
@@ -0,0 +1,213 @@
+/*
+ *      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>
+#include <asm/smp.h>
+
+atomic_t irq_err_count;
+
+#ifdef CONFIG_DEBUG_STACKOVERFLOW
+/*
+ * Probabilistic stack overflow check:
+ *
+ * Only check the stack in process context, because everything else
+ * runs on the big interrupt stacks. Checking reliably is too expensive,
+ * so we just check from interrupts.
+ */
+static inline void stack_overflow_check(struct pt_regs *regs)
+{
+        u64 curbase = (u64)task_stack_page(current);
+        static unsigned long warned = -60*HZ;
+
+        if (regs->rsp >= curbase && regs->rsp <= curbase + THREAD_SIZE &&
+            regs->rsp <  curbase + sizeof(struct thread_info) + 128 &&
+            time_after(jiffies, warned + 60*HZ)) {
+                printk("do_IRQ: %s near stack overflow (cur:%Lx,rsp:%lx)\n",
+                       current->comm, curbase, regs->rsp);
+                show_stack(NULL,NULL);
+                warned = jiffies;
+        }
+}
+#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%-8d",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, " %8s", irq_desc[i].chip->name);
+                seq_printf(p, "-%-8s", irq_desc[i].name);
+
+                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');
+                seq_printf(p, "LOC: ");
+                for_each_online_cpu(j)
+                        seq_printf(p, "%10u ", cpu_pda(j)->apic_timer_irqs);
+                seq_putc(p, '\n');
+                seq_printf(p, "ERR: %10u\n", atomic_read(&irq_err_count));
+        }
+        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)
+{
+        struct pt_regs *old_regs = set_irq_regs(regs);
+
+        /* high bit used in ret_from_ code  */
+        unsigned vector = ~regs->orig_rax;
+        unsigned irq;
+
+        exit_idle();
+        irq_enter();
+        irq = __get_cpu_var(vector_irq)[vector];
+
+#ifdef CONFIG_DEBUG_STACKOVERFLOW
+        stack_overflow_check(regs);
+#endif
+
+        if (likely(irq < NR_IRQS))
+                generic_handle_irq(irq);
+        else {
+                if (!disable_apic)
+                        ack_APIC_irq();
+
+                if (printk_ratelimit())
+                        printk(KERN_EMERG "%s: %d.%d No irq handler for vector\n",
+                                __func__, smp_processor_id(), vector);
+        }
+
+        irq_exit();
+
+        set_irq_regs(old_regs);
+        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;
+                int break_affinity = 0;
+                int set_affinity = 1;
+
+                if (irq == 2)
+                        continue;
+
+                /* interrupt's are disabled at this point */
+                spin_lock(&irq_desc[irq].lock);
+
+                if (!irq_has_action(irq) ||
+                    cpus_equal(irq_desc[irq].affinity, map)) {
+                        spin_unlock(&irq_desc[irq].lock);
+                        continue;
+                }
+
+                cpus_and(mask, irq_desc[irq].affinity, map);
+                if (cpus_empty(mask)) {
+                        break_affinity = 1;
+                        mask = map;
+                }
+
+                if (irq_desc[irq].chip->mask)
+                        irq_desc[irq].chip->mask(irq);
+
+                if (irq_desc[irq].chip->set_affinity)
+                        irq_desc[irq].chip->set_affinity(irq, mask);
+                else if (!(warned++))
+                        set_affinity = 0;
+
+                if (irq_desc[irq].chip->unmask)
+                        irq_desc[irq].chip->unmask(irq);
+
+                spin_unlock(&irq_desc[irq].lock);
+
+                if (break_affinity && set_affinity)
+                        printk("Broke affinity for irq %i\n", irq);
+                else if (!set_affinity)
+                        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();
+                WARN_ON_ONCE(softirq_count());
+        }
+        local_irq_restore(flags);
+}
+EXPORT_SYMBOL(do_softirq);