ReadReg           118 kernel/uart.c    while((ReadReg(LSR) & LSR_TX_IDLE) == 0)
ReadReg           131 kernel/uart.c    if(ReadReg(LSR) & LSR_RX_READY){
ReadReg           133 kernel/uart.c      return ReadReg(RHR);
ReadReg           145 kernel/uart.c    ReadReg(ISR); // acknowledge the interrupt
ReadReg           148 kernel/uart.c    if(ReadReg(LSR) & LSR_TX_IDLE){