1*b26c4863SBaruch Siach /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2*b26c4863SBaruch Siach #ifndef _LINUX_CONST_H 3*b26c4863SBaruch Siach #define _LINUX_CONST_H 4*b26c4863SBaruch Siach 5*b26c4863SBaruch Siach /* const.h: Macros for dealing with constants. */ 6*b26c4863SBaruch Siach 7*b26c4863SBaruch Siach /* Some constant macros are used in both assembler and 8*b26c4863SBaruch Siach * C code. Therefore we cannot annotate them always with 9*b26c4863SBaruch Siach * 'UL' and other type specifiers unilaterally. We 10*b26c4863SBaruch Siach * use the following macros to deal with this. 11*b26c4863SBaruch Siach * 12*b26c4863SBaruch Siach * Similarly, _AT() will cast an expression with a type in C, but 13*b26c4863SBaruch Siach * leave it unchanged in asm. 14*b26c4863SBaruch Siach */ 15*b26c4863SBaruch Siach 16*b26c4863SBaruch Siach #ifdef __ASSEMBLY__ 17*b26c4863SBaruch Siach #define _AC(X,Y) X 18*b26c4863SBaruch Siach #define _AT(T,X) X 19*b26c4863SBaruch Siach #else 20*b26c4863SBaruch Siach #define __AC(X,Y) (X##Y) 21*b26c4863SBaruch Siach #define _AC(X,Y) __AC(X,Y) 22*b26c4863SBaruch Siach #define _AT(T,X) ((T)(X)) 23*b26c4863SBaruch Siach #endif 24*b26c4863SBaruch Siach 25*b26c4863SBaruch Siach #define _UL(x) (_AC(x, UL)) 26*b26c4863SBaruch Siach #define _ULL(x) (_AC(x, ULL)) 27*b26c4863SBaruch Siach 28*b26c4863SBaruch Siach #define _BITUL(x) (_UL(1) << (x)) 29*b26c4863SBaruch Siach #define _BITULL(x) (_ULL(1) << (x)) 30*b26c4863SBaruch Siach 31*b26c4863SBaruch Siach #define UL(x) (_UL(x)) 32*b26c4863SBaruch Siach #define ULL(x) (_ULL(x)) 33*b26c4863SBaruch Siach 34*b26c4863SBaruch Siach #endif /* _LINUX_CONST_H */ 35