x86: iommu: use symbolic constants, not hardcoded numbers

Move symbolic constants into gart.h, and use them instead of hardcoded
constant.

Signed-off-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 5 insertions, 5 deletions

diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index c07455d1695f..bffcf455c857 100644
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -598,13 +598,13 @@ static __init int init_k8_gatt(struct agp_kern_info *info)
                 dev = k8_northbridges[i];
                 gatt_reg = __pa(gatt) >> 12;
                 gatt_reg <<= 4;
-                pci_write_config_dword(dev, 0x98, gatt_reg);
-                pci_read_config_dword(dev, 0x90, &ctl);
+                pci_write_config_dword(dev, AMD64_GARTTABLEBASE, gatt_reg);
+                pci_read_config_dword(dev, AMD64_GARTAPERTURECTL, &ctl);
 
-                ctl |= 1;
-                ctl &= ~((1<<4) | (1<<5));
+                ctl |= GARTEN;
+                ctl &= ~(DISGARTCPU | DISGARTIO);
 
-                pci_write_config_dword(dev, 0x90, ctl);
+                pci_write_config_dword(dev, AMD64_GARTAPERTURECTL, ctl);
         }
         flush_gart();