+/*
+ * The vpte base must be able to hold the entire vpte, half
+ * of which lives above, and half below, the base. And it
+ * is placed as close to the highest address range as possible.
+ */
+#define VPTE_BASE_SPITFIRE (-(VPTE_SIZE/2))
+#if 1
+#define VPTE_BASE_CHEETAH VPTE_BASE_SPITFIRE
+#else
+#define VPTE_BASE_CHEETAH 0xffe0000000000000
+#endif
+