HelenOS sources

DMAMEM_16MiB       50 uspace/lib/c/include/ddi.h #define DMAMEM_16MiB  ((uintptr_t) UINT64_C(0xffffffffff000000))
DMAMEM_16MiB       50 uspace/lib/posix/include/libc/ddi.h #define DMAMEM_16MiB  ((uintptr_t) UINT64_C(0xffffffffff000000))
HelenOS homepage, sources at GitHub