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Add a way of checking the position of a structure member 

U-Boot uses structures for hardware access so it is important that these
structures are correct. Add a way of asserting that a structure member is
at a particular offset. This can be created using the datasheet for the
hardware.

This implementation uses Static_assert() since BUILD_BUG_ON() only works
within functions.

Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass 2015-06-23 15:38:31 -06:00
parent 4eae498e68
commit c9689ca318
1 changed files with 11 additions and 0 deletions
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11
include/common.h
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@ -1010,6 +1010,17 @@ int cpu_release(int nr, int argc, char * const argv[]);
#define DEFINE_CACHE_ALIGN_BUFFER(type, name, size) \
DEFINE_ALIGN_BUFFER(type, name, size, ARCH_DMA_MINALIGN)
/*
* check_member() - Check the offset of a structure member
*
* @structure: Name of structure (e.g. global_data)
* @member: Name of member (e.g. baudrate)
* @offset: Expected offset in bytes
*/
#define check_member(structure, member, offset) _Static_assert( \
offsetof(struct structure, member) == offset, \
"`struct " #structure "` offset for `" #member "` is not " #offset)
/* Pull in stuff for the build system */
#ifdef DO_DEPS_ONLY
# include <environment.h>