| #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 |