diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index d0d18db5d2a4809c72126d665d92843267147297..a614ee10f8468ab8411955105b94d1dc858f90e2 100644
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -630,6 +630,7 @@ static __init int init_k8_gatt(struct agp_kern_info *info)
 	struct pci_dev *dev;
 	void *gatt;
 	int i, error;
+	unsigned long start_pfn, end_pfn;
 
 	printk(KERN_INFO "PCI-DMA: Disabling AGP.\n");
 	aper_size = aper_base = info->aper_size = 0;
@@ -674,6 +675,16 @@ static __init int init_k8_gatt(struct agp_kern_info *info)
 
 	printk(KERN_INFO "PCI-DMA: aperture base @ %x size %u KB\n",
 	       aper_base, aper_size>>10);
+
+	/* need to map that range */
+	end_pfn = (aper_base>>PAGE_SHIFT) + (aper_size>>PAGE_SHIFT);
+	if (end_pfn > max_low_pfn_mapped) {
+		start_pfn = max_low_pfn_mapped;
+		max_low_pfn_mapped = init_memory_mapping(start_pfn<<PAGE_SHIFT,
+							 end_pfn<<PAGE_SHIFT);
+		if (max_pfn_mapped < max_low_pfn_mapped)
+			max_pfn_mapped = max_low_pfn_mapped;
+	}
 	return 0;
 
  nommu: