1#ifndef _LINUX_PFN_H_ 2#define _LINUX_PFN_H_ 3 4#define PFN_ALIGN(x) (((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK) 5#define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT) 6#define PFN_DOWN(x) ((x) >> PAGE_SHIFT) 7#define PFN_PHYS(x) ((x) << PAGE_SHIFT) 8 9#endif 10