Quelle const.h Sprache: C

/* 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 */

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