src/helper/align.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2
   3 /*
   4  * The content of this file is mainly copied/inspired from Linux kernel
   5  * code in include/linux/align.h and include/uapi/linux/const.h
   6  *
   7  * Macro name 'ALIGN' conflicts with macOS/BSD file param.h
   8  */
   9
  10 #ifndef OPENOCD_HELPER_ALIGN_H
  11 #define OPENOCD_HELPER_ALIGN_H
  12
  13 #define ALIGN_MASK(x, mask)             \
  14 ({                                      \
  15         typeof(mask) _mask = (mask);        \
  16         ((x) + _mask) & ~_mask;             \
  17 })
  18
  19 /* @a is a power of 2 value */
  20 #define ALIGN_UP(x, a)          ALIGN_MASK(x, (typeof(x))(a) - 1)
  21 #define ALIGN_DOWN(x, a)        ((x) & ~((typeof(x))(a) - 1))
  22 #define IS_ALIGNED(x, a)        (((x) & ((typeof(x))(a) - 1)) == 0)
  23
  24 #define IS_PWR_OF_2(x)                  \
  25 ({                                      \
  26         typeof(x) _x = (x);                 \
  27         _x == 0 || (_x & (_x - 1)) == 0;    \
  28 })
  29
  30 #endif /* OPENOCD_HELPER_ALIGN_H */