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rtems: Add RTEMS_ALIGN_DOWN()

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Update #3959.
Update #4074.
This commit is contained in:
Sebastian Huber
2020-09-16 10:33:52 +02:00
parent 11c1b862df
commit 641b31a48d
1 changed files with 15 additions and 0 deletions
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15
cpukit/include/rtems/score/basedefs.h
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@@ -219,6 +219,21 @@
#define RTEMS_WEAK_ALIAS( _target )
#endif
/**
* @brief Returns the specified value aligned down to the specified alignment.
*
* @param _value is the value to align down.
*
* @param _alignment is the desired alignment in bytes. The alignment shall be
* a power of two, otherwise the returned value is undefined. The alignment
* parameter is evaluated twice.
*
* @return The specified value aligned down to the specified alignment is
* returned.
*/
#define RTEMS_ALIGN_DOWN( _value, _alignment ) \
( ( _value ) & ~( ( _alignment ) - 1 ) )
/**
* @brief Instructs the compiler to enforce the specified alignment.
*/