/**
Get ControlBits.
@param[in] This Pointer to EFI_SERIAL_IO_PROTOCOL.
@param[out] Control Control signals of the serial device.
@retval EFI_SUCCESS Get Control signals successfully.
**/
EFI_STATUS
EFIAPI
SerialGetControl (
IN EFI_SERIAL_IO_PROTOCOL *This,
OUT UINT32 *Control
)
{
DEBUG_PORT_HANDLE Handle;
Handle = GetDebugPortHandle ();
//
// Always assume the output buffer is empty and the Debug Communication Library can process
// more write requests.
//
*Control = mSerialIoMode.ControlMask | EFI_SERIAL_OUTPUT_BUFFER_EMPTY;
//
// Check to see if the Terminal FIFO is empty and
// check to see if the input buffer in the Debug Communication Library is empty
//
if (!IsDebugTermianlFifoEmpty (&mSerialFifoForTerminal) || DebugPortPollBuffer (Handle)) {
*Control &= ~EFI_SERIAL_INPUT_BUFFER_EMPTY;
}
return EFI_SUCCESS;
}
/**
Get ControlBits.
@param[in] This Pointer to EFI_SERIAL_IO_PROTOCOL.
@param[out] Control Control signals of the serial device.
@retval EFI_SUCCESS Get Control signals successfully.
**/
EFI_STATUS
EFIAPI
SerialGetControl (
IN EFI_SERIAL_IO_PROTOCOL *This,
OUT UINT32 *Control
)
{
DEBUG_PORT_HANDLE Handle;
BOOLEAN DebugTimerInterruptState;
EFI_TPL Tpl;
//
// Raise TPL to prevent recursion from EFI timer interrupts
//
Tpl = gBS->RaiseTPL (TPL_NOTIFY);
//
// Save and disable Debug Timer interrupt to avoid it to access Debug Port
//
DebugTimerInterruptState = SaveAndSetDebugTimerInterrupt (FALSE);
Handle = GetDebugPortHandle ();
//
// Always assume the output buffer is empty and the Debug Communication Library can process
// more write requests.
//
*Control = mSerialIoMode.ControlMask | EFI_SERIAL_OUTPUT_BUFFER_EMPTY;
//
// Check to see if the Terminal FIFO is empty and
// check to see if the input buffer in the Debug Communication Library is empty
//
if (!IsDebugTermianlFifoEmpty (&mSerialFifoForTerminal) || DebugPortPollBuffer (Handle)) {
*Control &= ~EFI_SERIAL_INPUT_BUFFER_EMPTY;
}
//
// Restore Debug Timer interrupt
//
SaveAndSetDebugTimerInterrupt (DebugTimerInterruptState);
//
// Restore to original TPL
//
gBS->RestoreTPL (Tpl);
return EFI_SUCCESS;
}
/**
Remove data from specific FIFO.
@param[in] Fifo A pointer to the Data Structure DEBUG_SERIAL_FIFO.
@param[out] Data The data removed from FIFO.
@retval EFI_SUCCESS Remove data from specific FIFO successfully.
@retval EFI_OUT_OF_RESOURCE Failed to remove data because FIFO is empty.
**/
EFI_STATUS
DebugTerminalFifoRemove (
IN DEBUG_SERIAL_FIFO *Fifo,
OUT UINT8 *Data
)
{
//
// if FIFO is empty, no data can remove
//
if (IsDebugTermianlFifoEmpty (Fifo)) {
return EFI_OUT_OF_RESOURCES;
}
//
// FIFO is not empty, can remove data
//
*Data = Fifo->Data[Fifo->First];
Fifo->Surplus++;
Fifo->First++;
if (Fifo->First == DEBGU_SERIAL_IO_FIFO_DEPTH) {
Fifo->First = 0;
}
return EFI_SUCCESS;
}
