diff --git a/arch/x86/include/asm/ioapic.h b/arch/x86/include/asm/ioapic.h
index 699160f..f5d69db 100644
--- a/arch/x86/include/asm/ioapic.h
+++ b/arch/x86/include/asm/ioapic.h
@@ -10,29 +10,9 @@
 #define __ASM_IOAPIC_H
 
 #define IO_APIC_ADDR		0xfec00000
-#define IO_APIC_INDEX		IO_APIC_ADDR
-#define IO_APIC_DATA		(IO_APIC_ADDR + 0x10)
-#define IO_APIC_INTERRUPTS	24
-
-#define ALL		(0xff << 24)
-#define NONE		0
-#define DISABLED	(1 << 16)
-#define ENABLED		(0 << 16)
-#define TRIGGER_EDGE	(0 << 15)
-#define TRIGGER_LEVEL	(1 << 15)
-#define POLARITY_HIGH	(0 << 13)
-#define POLARITY_LOW	(1 << 13)
-#define PHYSICAL_DEST	(0 << 11)
-#define LOGICAL_DEST	(1 << 11)
-#define ExtINT		(7 << 8)
-#define NMI		(4 << 8)
-#define SMI		(2 << 8)
-#define INT		(1 << 8)
 
-u32 io_apic_read(u32 ioapic_base, u32 reg);
-void io_apic_write(u32 ioapic_base, u32 reg, u32 value);
-void set_ioapic_id(u32 ioapic_base, u8 ioapic_id);
-void setup_ioapic(u32 ioapic_base, u8 ioapic_id);
-void clear_ioapic(u32 ioapic_base);
+/* Direct addressed register */
+#define IO_APIC_INDEX		(IO_APIC_ADDR + 0x00)
+#define IO_APIC_DATA		(IO_APIC_ADDR + 0x10)
 
 #endif