-extern unsigned long find_e820_area(unsigned long start, unsigned long end,
- unsigned long size, unsigned long align);
-extern unsigned long find_e820_area_size(unsigned long start,
- unsigned long *sizep,
- unsigned long align);
-extern void add_memory_region(unsigned long start, unsigned long size,
- int type);
-extern void update_memory_range(u64 start, u64 size, unsigned old_type,
- unsigned new_type);