Index: kernel/genarch/src/ofw/pci.c
===================================================================
--- kernel/genarch/src/ofw/pci.c	(revision 28ecadba2f66309e3ea4c819f1e768f64d97b699)
+++ kernel/genarch/src/ofw/pci.c	(revision 5d684e4c0dde4f587dd5aca281c366f71f72853b)
@@ -42,5 +42,7 @@
 #include <macros.h>
 
-#define PCI_SPACE_MASK	0x03000000
+#define PCI_SPACE_MASK		0x03000000
+#define PCI_ABS_MASK		0x80000000	
+#define PCI_REG_MASK		0x000000ff
 
 bool ofw_pci_apply_ranges(ofw_tree_node_t *node, ofw_pci_reg_t *reg, uintptr_t *pa)
@@ -74,4 +76,39 @@
 }
 
+bool ofw_pci_reg_absolutize(ofw_tree_node_t *node, ofw_pci_reg_t *reg, ofw_pci_reg_t *out)
+{
+	if (reg->space & PCI_ABS_MASK) {
+		/* already absolute */
+		out->space = reg->space;
+		out->addr = reg->addr;
+		out->size = reg->size;
+		return true;
+	}
+	
+	ofw_tree_property_t *prop;
+	ofw_pci_reg_t *assigned_address;
+	count_t assigned_addresses;
+	
+	prop = ofw_tree_getprop(node, "assigned-addresses");
+	if (!prop)
+		panic("Can't find \"assigned-addresses\" property.\n");
+	
+	assigned_addresses = prop->size / sizeof(ofw_pci_reg_t);
+	assigned_address = prop->value;
+	
+	int i;
+	
+	for (i = 0; i < assigned_addresses; i++) {
+		if ((assigned_address[i].space & PCI_REG_MASK) == (reg->space & PCI_REG_MASK)) {
+			out->space = assigned_address[i].space;
+			out->addr = reg->addr + assigned_address[i].addr;
+			out->size = reg->size;
+			return true;
+		}
+	}
+	
+	return false;
+}
+
 /** @}
  */