-extern unsigned long region_pa(void *virt);
-extern void *region_va(unsigned long phys);
-
-#define __pa(virt) region_pa((void *) (virt))
-#define __va(phys) region_va((unsigned long) (phys))
-
-extern unsigned long page_to_pfn(struct page *page);
-extern struct page *pfn_to_page(unsigned long pfn);