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  */
  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