+
+/* Enable IOAPIC early just for system timer */
+void __init pre_init_apic_IRQ0(void)
+{
+ struct irq_cfg *cfg;
+ struct irq_desc *desc;
+
+ printk(KERN_INFO "Early APIC setup for system timer0\n");
+#ifndef CONFIG_SMP
+ phys_cpu_present_map = physid_mask_of_physid(boot_cpu_physical_apicid);
+#endif
+ desc = irq_to_desc_alloc_node(0, 0);
+
+ setup_local_APIC();
+
+ cfg = irq_cfg(0);
+ add_pin_to_irq_node(cfg, 0, 0, 0);
+ set_irq_chip_and_handler_name(0, &ioapic_chip, handle_edge_irq, "edge");
+
+ setup_IO_APIC_irq(0, 0, 0, desc, 0, 0);
+}