LXR linux/include/linux/pfn.h

   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 */
  12typedef 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