MACH2PHYS_VIRT_START
#define MACH2PHYS_NR_ENTRIES ((MACH2PHYS_VIRT_END-MACH2PHYS_VIRT_START)>>__MACH2PHYS_SHIFT)
unsigned long *machine_to_phys_mapping = (void *)MACH2PHYS_VIRT_START;