Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __VDSO_PAGE_H
3#define __VDSO_PAGE_H
4
5#include <uapi/linux/const.h>
6
7/*
8 * PAGE_SHIFT determines the page size.
9 *
10 * Note: This definition is required because PAGE_SHIFT is used
11 * in several places throughout the codebase.
12 */
13#define PAGE_SHIFT CONFIG_PAGE_SHIFT
14
15#define PAGE_SIZE (_AC(1,UL) << CONFIG_PAGE_SHIFT)
16
17#if !defined(CONFIG_64BIT)
18/*
19 * Applies only to 32-bit architectures.
20 *
21 * Subtle: (1 << CONFIG_PAGE_SHIFT) is an int, not an unsigned long.
22 * So if we assign PAGE_MASK to a larger type it gets extended the
23 * way we want (i.e. with 1s in the high bits) while masking a
24 * 64-bit value such as phys_addr_t.
25 */
26#define PAGE_MASK (~((1 << CONFIG_PAGE_SHIFT) - 1))
27#else
28#define PAGE_MASK (~(PAGE_SIZE - 1))
29#endif
30
31#endif /* __VDSO_PAGE_H */