xref: /linux/include/linux/pfn.h (revision 498495dba268b20e8eadd7fe93c140c68b6cc9d2)
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  */
13 typedef 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