amr_inb
if ((amr_inb(amr, AMR_SREG_MBOX_BUSY) & AMR_SMBOX_BUSY_FLAG) != 0) {
if (((istat = amr_inb(amr, AMR_SREG_INTR)) & AMR_SINTR_VALID) == 0)
amr_inb(amr, AMR_SREG_TOGL) | AMR_STOGL_ENABLE);