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