1efe8419aSVincenzo Frascino /* SPDX-License-Identifier: GPL-2.0 */ 2efe8419aSVincenzo Frascino #ifndef __VDSO_PAGE_H 3efe8419aSVincenzo Frascino #define __VDSO_PAGE_H 4efe8419aSVincenzo Frascino 5efe8419aSVincenzo Frascino #include <uapi/linux/const.h> 6efe8419aSVincenzo Frascino 7efe8419aSVincenzo Frascino /* 8efe8419aSVincenzo Frascino * PAGE_SHIFT determines the page size. 9efe8419aSVincenzo Frascino * 10efe8419aSVincenzo Frascino * Note: This definition is required because PAGE_SHIFT is used 11*763d1ebeSHaiyue Wang * in several places throughout the codebase. 12efe8419aSVincenzo Frascino */ 13efe8419aSVincenzo Frascino #define PAGE_SHIFT CONFIG_PAGE_SHIFT 14efe8419aSVincenzo Frascino 15efe8419aSVincenzo Frascino #define PAGE_SIZE (_AC(1,UL) << CONFIG_PAGE_SHIFT) 16efe8419aSVincenzo Frascino 17d4a65302SArnd Bergmann #if !defined(CONFIG_64BIT) 18efe8419aSVincenzo Frascino /* 19d4a65302SArnd Bergmann * Applies only to 32-bit architectures. 20efe8419aSVincenzo Frascino * 21efe8419aSVincenzo Frascino * Subtle: (1 << CONFIG_PAGE_SHIFT) is an int, not an unsigned long. 22efe8419aSVincenzo Frascino * So if we assign PAGE_MASK to a larger type it gets extended the 23d4a65302SArnd Bergmann * way we want (i.e. with 1s in the high bits) while masking a 24d4a65302SArnd Bergmann * 64-bit value such as phys_addr_t. 25efe8419aSVincenzo Frascino */ 26efe8419aSVincenzo Frascino #define PAGE_MASK (~((1 << CONFIG_PAGE_SHIFT) - 1)) 27efe8419aSVincenzo Frascino #else 28efe8419aSVincenzo Frascino #define PAGE_MASK (~(PAGE_SIZE - 1)) 29efe8419aSVincenzo Frascino #endif 30efe8419aSVincenzo Frascino 31efe8419aSVincenzo Frascino #endif /* __VDSO_PAGE_H */ 32