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 throuout 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 */ 32