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 | |