1*4dc78e53SAndroid Build Coastguard Worker /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2*4dc78e53SAndroid Build Coastguard Worker /* const.h: Macros for dealing with constants. */ 3*4dc78e53SAndroid Build Coastguard Worker 4*4dc78e53SAndroid Build Coastguard Worker #ifndef _LINUX_CONST_H 5*4dc78e53SAndroid Build Coastguard Worker #define _LINUX_CONST_H 6*4dc78e53SAndroid Build Coastguard Worker 7*4dc78e53SAndroid Build Coastguard Worker /* Some constant macros are used in both assembler and 8*4dc78e53SAndroid Build Coastguard Worker * C code. Therefore we cannot annotate them always with 9*4dc78e53SAndroid Build Coastguard Worker * 'UL' and other type specifiers unilaterally. We 10*4dc78e53SAndroid Build Coastguard Worker * use the following macros to deal with this. 11*4dc78e53SAndroid Build Coastguard Worker * 12*4dc78e53SAndroid Build Coastguard Worker * Similarly, _AT() will cast an expression with a type in C, but 13*4dc78e53SAndroid Build Coastguard Worker * leave it unchanged in asm. 14*4dc78e53SAndroid Build Coastguard Worker */ 15*4dc78e53SAndroid Build Coastguard Worker 16*4dc78e53SAndroid Build Coastguard Worker #ifdef __ASSEMBLY__ 17*4dc78e53SAndroid Build Coastguard Worker #define _AC(X,Y) X 18*4dc78e53SAndroid Build Coastguard Worker #define _AT(T,X) X 19*4dc78e53SAndroid Build Coastguard Worker #else 20*4dc78e53SAndroid Build Coastguard Worker #define __AC(X,Y) (X##Y) 21*4dc78e53SAndroid Build Coastguard Worker #define _AC(X,Y) __AC(X,Y) 22*4dc78e53SAndroid Build Coastguard Worker #define _AT(T,X) ((T)(X)) 23*4dc78e53SAndroid Build Coastguard Worker #endif 24*4dc78e53SAndroid Build Coastguard Worker 25*4dc78e53SAndroid Build Coastguard Worker #define _UL(x) (_AC(x, UL)) 26*4dc78e53SAndroid Build Coastguard Worker #define _ULL(x) (_AC(x, ULL)) 27*4dc78e53SAndroid Build Coastguard Worker 28*4dc78e53SAndroid Build Coastguard Worker #define _BITUL(x) (_UL(1) << (x)) 29*4dc78e53SAndroid Build Coastguard Worker #define _BITULL(x) (_ULL(1) << (x)) 30*4dc78e53SAndroid Build Coastguard Worker 31*4dc78e53SAndroid Build Coastguard Worker #define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (__typeof__(x))(a) - 1) 32*4dc78e53SAndroid Build Coastguard Worker #define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask)) 33*4dc78e53SAndroid Build Coastguard Worker 34*4dc78e53SAndroid Build Coastguard Worker #define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d)) 35*4dc78e53SAndroid Build Coastguard Worker 36*4dc78e53SAndroid Build Coastguard Worker #endif /* _LINUX_CONST_H */ 37