Symbol: MC_REGB_AIE
sys/arch/amd64/isa/clock.c
556
mc146818_write(NULL, MC_REGB, MC_REGB_24HR | MC_REGB_AIE);
sys/arch/amd64/isa/clock.c
570
if ((mc146818_read(NULL, MC_REGB) & MC_REGB_AIE) == 0)