diff --git a/include/asm-ia64/iosapic.h b/include/asm-ia64/iosapic.h
new file mode 100644
index 0000000..38a7a72
--- /dev/null
+++ b/include/asm-ia64/iosapic.h
@@ -0,0 +1,110 @@
+#ifndef __ASM_IA64_IOSAPIC_H
+#define __ASM_IA64_IOSAPIC_H
+
+#define	IOSAPIC_REG_SELECT	0x0
+#define	IOSAPIC_WINDOW		0x10
+#define	IOSAPIC_EOI		0x40
+
+#define	IOSAPIC_VERSION		0x1
+
+/*
+ * Redirection table entry
+ */
+#define	IOSAPIC_RTE_LOW(i)	(0x10+i*2)
+#define	IOSAPIC_RTE_HIGH(i)	(0x11+i*2)
+
+#define	IOSAPIC_DEST_SHIFT		16
+
+/*
+ * Delivery mode
+ */
+#define	IOSAPIC_DELIVERY_SHIFT		8
+#define	IOSAPIC_FIXED			0x0
+#define	IOSAPIC_LOWEST_PRIORITY	0x1
+#define	IOSAPIC_PMI			0x2
+#define	IOSAPIC_NMI			0x4
+#define	IOSAPIC_INIT			0x5
+#define	IOSAPIC_EXTINT			0x7
+
+/*
+ * Interrupt polarity
+ */
+#define	IOSAPIC_POLARITY_SHIFT		13
+#define	IOSAPIC_POL_HIGH		0
+#define	IOSAPIC_POL_LOW		1
+
+/*
+ * Trigger mode
+ */
+#define	IOSAPIC_TRIGGER_SHIFT		15
+#define	IOSAPIC_EDGE			0
+#define	IOSAPIC_LEVEL			1
+
+/*
+ * Mask bit
+ */
+
+#define	IOSAPIC_MASK_SHIFT		16
+#define	IOSAPIC_MASK			(1<<IOSAPIC_MASK_SHIFT)
+
+#ifndef __ASSEMBLY__
+
+#ifdef CONFIG_IOSAPIC
+
+#define NR_IOSAPICS			256
+
+static inline unsigned int iosapic_read(char __iomem *iosapic, unsigned int reg)
+{
+	writel(reg, iosapic + IOSAPIC_REG_SELECT);
+	return readl(iosapic + IOSAPIC_WINDOW);
+}
+
+static inline void iosapic_write(char __iomem *iosapic, unsigned int reg, u32 val)
+{
+	writel(reg, iosapic + IOSAPIC_REG_SELECT);
+	writel(val, iosapic + IOSAPIC_WINDOW);
+}
+
+static inline void iosapic_eoi(char __iomem *iosapic, u32 vector)
+{
+	writel(vector, iosapic + IOSAPIC_EOI);
+}
+
+extern void __init iosapic_system_init (int pcat_compat);
+extern void __init iosapic_init (unsigned long address,
+				    unsigned int gsi_base);
+extern int gsi_to_vector (unsigned int gsi);
+extern int gsi_to_irq (unsigned int gsi);
+extern void iosapic_enable_intr (unsigned int vector);
+extern int iosapic_register_intr (unsigned int gsi, unsigned long polarity,
+				  unsigned long trigger);
+#ifdef CONFIG_ACPI_DEALLOCATE_IRQ
+extern void iosapic_unregister_intr (unsigned int irq);
+#endif
+extern void __init iosapic_override_isa_irq (unsigned int isa_irq, unsigned int gsi,
+				      unsigned long polarity,
+				      unsigned long trigger);
+extern int __init iosapic_register_platform_intr (u32 int_type,
+					   unsigned int gsi,
+					   int pmi_vector,
+					   u16 eid, u16 id,
+					   unsigned long polarity,
+					   unsigned long trigger);
+extern unsigned int iosapic_version (char __iomem *addr);
+
+extern void iosapic_pci_fixup (int);
+#ifdef CONFIG_NUMA
+extern void __init map_iosapic_to_node (unsigned int, int);
+#endif
+#else
+#define iosapic_system_init(pcat_compat)			do { } while (0)
+#define iosapic_init(address,gsi_base)				do { } while (0)
+#define iosapic_register_intr(gsi,polarity,trigger)		(gsi)
+#define iosapic_unregister_intr(irq)				do { } while (0)
+#define iosapic_override_isa_irq(isa_irq,gsi,polarity,trigger)	do { } while (0)
+#define iosapic_register_platform_intr(type,gsi,pmi,eid,id, \
+	polarity,trigger)					(gsi)
+#endif
+
+# endif /* !__ASSEMBLY__ */
+#endif /* __ASM_IA64_IOSAPIC_H */