/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ /* const.h: Macros for dealing with constants. */ #ifndef _UAPI_LINUX_CONST_H #define _UAPI_LINUX_CONST_H /* Some constant macros are used in both assembler and * C code. Therefore we cannot annotate them always with * 'UL' and other type specifiers unilaterally. We * use the following macros to deal with this. * * Similarly, _AT() will cast an expression with a type in C, but * leave it unchanged in asm. */ #ifdef __ASSEMBLY__ #define _AC(X,Y) X #define _AT(T,X) X #else #define __AC(X,Y) (X##Y) #define _AC(X,Y) __AC(X,Y) #define _AT(T,X) ((T)(X)) #endif #define _UL(x) (_AC(x, UL)) #define _ULL(x) (_AC(x, ULL)) #define _BITUL(x) (_UL(1) << (x)) #define _BITULL(x) (_ULL(1) << (x)) #if !defined(__ASSEMBLY__) /* * Missing asm support * * __BIT128() would not work in the asm code, as it shifts an * 'unsigned __int128' data type as direct representation of * 128 bit constants is not supported in the gcc compiler, as * they get silently truncated. * * TODO: Please revisit this implementation when gcc compiler * starts representing 128 bit constants directly like long * and unsigned long etc. Subsequently drop the comment for * GENMASK_U128() which would then start supporting asm code. */ #define _BIT128(x) ((unsigned __int128)(1) << (x)) #endif #define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (__typeof__(x))(a) - 1) #define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask)) #define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d)) #endif /* _UAPI_LINUX_CONST_H */