diff --git a/src/southbridge/amd/sb600/sb600.c b/src/southbridge/amd/sb600/sb600.c
index b1b17f0022..ef941ddb01 100644
--- a/src/southbridge/amd/sb600/sb600.c
+++ b/src/southbridge/amd/sb600/sb600.c
@@ -60,13 +60,13 @@ void set_sm_enable_bits(device_t sm_dev, u32 reg_pos, u32 mask, u32 val)
 	}
 }
 
-static void pmio_write_index(unsigned long port_base, u8 reg, u8 value)
+static void pmio_write_index(u16 port_base, u8 reg, u8 value)
 {
 	outb(reg, port_base);
 	outb(value, port_base + 1);
 }
 
-static u8 pmio_read_index(unsigned long port_base, u8 reg)
+static u8 pmio_read_index(u16 port_base, u8 reg)
 {
 	outb(reg, port_base);
 	return inb(port_base + 1);
@@ -74,26 +74,22 @@ static u8 pmio_read_index(unsigned long port_base, u8 reg)
 
 void pm_iowrite(u8 reg, u8 value)
 {
-	unsigned long port_base = 0xcd6;
-	pmio_write_index(port_base, reg, value);
+	pmio_write_index(PM_INDEX, reg, value);
 }
 
 u8 pm_ioread(u8 reg)
 {
-	unsigned long port_base = 0xcd6;
-	return pmio_read_index(port_base, reg);
+	return pmio_read_index(PM_INDEX, reg);
 }
 
 void pm2_iowrite(u8 reg, u8 value)
 {
-	unsigned long port_base = 0xcd0;
-	pmio_write_index(port_base, reg, value);
+	pmio_write_index(PM2_INDEX, reg, value);
 }
 
 u8 pm2_ioread(u8 reg)
 {
-	unsigned long port_base = 0xcd0;
-	return pmio_read_index(port_base, reg);
+	return pmio_read_index(PM2_INDEX, reg);
 }
 
 static void set_pmio_enable_bits(device_t sm_dev, u32 reg_pos,
diff --git a/src/southbridge/amd/sb600/sb600.h b/src/southbridge/amd/sb600/sb600.h
index 24b028de3d..ce8bce446a 100644
--- a/src/southbridge/amd/sb600/sb600.h
+++ b/src/southbridge/amd/sb600/sb600.h
@@ -23,6 +23,12 @@
 #include <device/pci_ids.h>
 #include "chip.h"
 
+/* Power management index/data registers */
+#define PM_INDEX	0xcd6
+#define PM_DATA		0xcd7
+#define PM2_INDEX	0xcd0
+#define PM2_DATA	0xcd1
+
 extern void pm_iowrite(u8 reg, u8 value);
 extern u8 pm_ioread(u8 reg);
 extern void pm2_iowrite(u8 reg, u8 value);
diff --git a/src/southbridge/amd/sb600/sb600_early_setup.c b/src/southbridge/amd/sb600/sb600_early_setup.c
index 50acc0e59b..7f588e9ce7 100644
--- a/src/southbridge/amd/sb600/sb600_early_setup.c
+++ b/src/southbridge/amd/sb600/sb600_early_setup.c
@@ -18,24 +18,22 @@
  */
 
 #include <arch/cpu.h>
+#include "sb600.h"
 #include "sb600_smbus.c"
 
 #define SMBUS_IO_BASE 0x1000	/* Is it a temporary SMBus I/O base address? */
 	 /*SIZE 0x40 */
 
-
-/* Copied from sb600.c
-* 0xCD6-0xCD7 is power management I/O register.*/
 static void pmio_write(u8 reg, u8 value)
 {
-	outb(reg, 0xCD6);
-	outb(value, 0xCD6 + 1);
+	outb(reg, PM_INDEX);
+	outb(value, PM_INDEX + 1);
 }
 
 static u8 pmio_read(u8 reg)
 {
-	outb(reg, 0xCD6);
-	return inb(0xCD6 + 1);
+	outb(reg, PM_INDEX);
+	return inb(PM_INDEX + 1);
 }
 
 /* Get SB ASIC Revision.*/