1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2#ifndef _LINUX_CONST_H 3#define _LINUX_CONST_H 4 5/* const.h: Macros for dealing with constants. */ 6 7/* Some constant macros are used in both assembler and 8 * C code. Therefore we cannot annotate them always with 9 * 'UL' and other type specifiers unilaterally. We 10 * use the following macros to deal with this. 11 * 12 * Similarly, _AT() will cast an expression with a type in C, but 13 * leave it unchanged in asm. 14 */ 15 16#ifdef __ASSEMBLY__ 17#define _AC(X,Y) X 18#define _AT(T,X) X 19#else 20#define __AC(X,Y) (X##Y) 21#define _AC(X,Y) __AC(X,Y) 22#define _AT(T,X) ((T)(X)) 23#endif 24 25#define _UL(x) (_AC(x, UL)) 26#define _ULL(x) (_AC(x, ULL)) 27 28#define _BITUL(x) (_UL(1) << (x)) 29#define _BITULL(x) (_ULL(1) << (x)) 30 31#define UL(x) (_UL(x)) 32#define ULL(x) (_ULL(x)) 33 34#endif /* _LINUX_CONST_H */ 35