pfn.h 666 B

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