ERROR_VALUE
if ((reg & ERROR_VALUE) == 0) {
#define ED_GN (ERROR_VALUE | E_SOURCE_DRV | E_CLASS_GENERAL)
#define ED_RT (ERROR_VALUE | E_SOURCE_DRV | E_CLASS_REAL_TIME_ERROR)
#define EB_ISO (ERROR_VALUE | E_SOURCE_BOARD | \
#define EB_RI (ERROR_VALUE | E_SOURCE_BOARD | E_CLASS_RSRC_IMPOSSIBLE)
#define EB_WCC (ERROR_VALUE | E_SOURCE_BOARD | E_CLASS_WRONG_CONTEXT)