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