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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __VDSO_PAGE_H
#define __VDSO_PAGE_H
#include <uapi/linux/const.h>
/*
* PAGE_SHIFT determines the page size.
*
* Note: This definition is required because PAGE_SHIFT is used
* in several places throughout the codebase.
*/
#define PAGE_SHIFT CONFIG_PAGE_SHIFT
#define PAGE_SIZE (_AC(1,UL) << CONFIG_PAGE_SHIFT)
#if !defined(CONFIG_64BIT)
/*
* Applies only to 32-bit architectures.
*
* Subtle: (1 << CONFIG_PAGE_SHIFT) is an int, not an unsigned long.
* So if we assign PAGE_MASK to a larger type it gets extended the
* way we want (i.e. with 1s in the high bits) while masking a
* 64-bit value such as phys_addr_t.
*/
#define PAGE_MASK (~((1 << CONFIG_PAGE_SHIFT) - 1))
#else
#define PAGE_MASK (~(PAGE_SIZE - 1))
#endif
#endif /* __VDSO_PAGE_H */
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