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oasis-root

Compiled tree of Oasis Linux based on own branch at <https://hacktivis.me/git/oasis/> git clone https://anongit.hacktivis.me/git/oasis-root.git

const.h (1587B)

    

  1. /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
  2. /* const.h: Macros for dealing with constants.  */
  4. #ifndef _LINUX_CONST_H
  5. #define _LINUX_CONST_H
  7. /* Some constant macros are used in both assembler and
  8.  * C code.  Therefore we cannot annotate them always with
  9.  * 'UL' and other type specifiers unilaterally.  We
  10.  * use the following macros to deal with this.
  11.  *
  12.  * Similarly, _AT() will cast an expression with a type in C, but
  13.  * leave it unchanged in asm.
  14.  */
  16. #ifdef __ASSEMBLY__
  17. #define _AC(X,Y)	X
  18. #define _AT(T,X)	X
  19. #else
  20. #define __AC(X,Y)	(X##Y)
  21. #define _AC(X,Y)	__AC(X,Y)
  22. #define _AT(T,X)	((T)(X))
  23. #endif
  25. #define _UL(x)		(_AC(x, UL))
  26. #define _ULL(x)		(_AC(x, ULL))
  28. #define _BITUL(x)	(_UL(1) << (x))
  29. #define _BITULL(x)	(_ULL(1) << (x))
  31. #if !defined(__ASSEMBLY__)
  32. /*
  33.  * Missing __asm__ support
  34.  *
  35.  * __BIT128() would not work in the __asm__ code, as it shifts an
  36.  * 'unsigned __init128' data type as direct representation of
  37.  * 128 bit constants is not supported in the gcc compiler, as
  38.  * they get silently truncated.
  39.  *
  40.  * TODO: Please revisit this implementation when gcc compiler
  41.  * starts representing 128 bit constants directly like long
  42.  * and unsigned long etc. Subsequently drop the comment for
  43.  * GENMASK_U128() which would then start supporting __asm__ code.
  44.  */
  45. #define _BIT128(x)	((unsigned __int128)(1) << (x))
  46. #endif
  48. #define __ALIGN_KERNEL(x, a)		__ALIGN_KERNEL_MASK(x, (__typeof__(x))(a) - 1)
  49. #define __ALIGN_KERNEL_MASK(x, mask)	(((x) + (mask)) & ~(mask))
  51. #define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
  53. #endif /* _LINUX_CONST_H */