HelenOS sources

UPPER32           136 kernel/generic/include/macros.h #define UPPER32(arg)  (((((uint64_t) arg)) >> 32) & UINT32_C(0xffffffff))
UPPER32            51 uspace/lib/c/include/macros.h #define UPPER32(arg)  (((((uint64_t) arg)) >> 32) & 0xffffffff)
UPPER32            51 uspace/lib/posix/include/libc/macros.h #define UPPER32(arg)  (((((uint64_t) arg)) >> 32) & 0xffffffff)