#ifndef _LINUX_PFN_H_ | |
#define _LINUX_PFN_H_ | |
#ifndef __ASSEMBLY__ | |
#include <linux/types.h> | |
/* | |
* pfn_t: encapsulates a page-frame number that is optionally backed | |
* by memmap (struct page). Whether a pfn_t has a 'struct page' | |
* backing is indicated by flags in the high bits of the value. | |
*/ | |
typedef struct { | |
u64 val; | |
} pfn_t; | |
#endif | |
#define PFN_ALIGN(x) (((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK) | |
#define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT) | |
#define PFN_DOWN(x) ((x) >> PAGE_SHIFT) | |
#define PFN_PHYS(x) ((phys_addr_t)(x) << PAGE_SHIFT) | |
#define PHYS_PFN(x) ((unsigned long)((x) >> PAGE_SHIFT)) | |
#endif |