1 #ifndef _LINUX_PFN_H_ 2 #define _LINUX_PFN_H_ 3 4 #ifndef __ASSEMBLY__ 5 #include <linux/types.h> 6 7 /* 8 * pfn_t: encapsulates a page-frame number that is optionally backed 9 * by memmap (struct page). Whether a pfn_t has a 'struct page' 10 * backing is indicated by flags in the high bits of the value. 11 */ 12 typedef struct { 13 u64 val; 14 } pfn_t; 15 #endif 16 17 #define PFN_ALIGN(x) (((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK) 18 #define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT) 19 #define PFN_DOWN(x) ((x) >> PAGE_SHIFT) 20 #define PFN_PHYS(x) ((phys_addr_t)(x) << PAGE_SHIFT) 21 #define PHYS_PFN(x) ((unsigned long)((x) >> PAGE_SHIFT)) 22 23 #endif 24