LXR linux/include/linux/pfn.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _LINUX_PFN_H_
   3#define _LINUX_PFN_H_
   4
   5#ifndef __ASSEMBLY__
   6#include <linux/types.h>
   7
   8/*
   9 * pfn_t: encapsulates a page-frame number that is optionally backed
  10 * by memmap (struct page).  Whether a pfn_t has a 'struct page'
  11 * backing is indicated by flags in the high bits of the value.
  12 */
  13typedef struct {
  14        u64 val;
  15} pfn_t;
  16#endif
  17
  18#define PFN_ALIGN(x)    (((unsigned long)(x) + (PAGE_SIZE - 1)) & PAGE_MASK)
  19#define PFN_UP(x)       (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
  20#define PFN_DOWN(x)     ((x) >> PAGE_SHIFT)
  21#define PFN_PHYS(x)     ((phys_addr_t)(x) << PAGE_SHIFT)
  22#define PHYS_PFN(x)     ((unsigned long)((x) >> PAGE_SHIFT))
  23
  24#endif
  25