/**
Remove one pre-fetched key out of the FIFO buffer.
@param TerminalDevice Terminal driver private structure.
@param Output The key will be removed.
@retval TRUE If insert successfully.
@retval FLASE If FIFO buffer is empty before remove operation.
**/
BOOLEAN
EfiKeyFiFoRemoveOneKey (
TERMINAL_DEV *TerminalDevice,
EFI_INPUT_KEY *Output
)
{
UINT8 Head;
Head = TerminalDevice->EfiKeyFiFo->Head;
ASSERT (Head < FIFO_MAX_NUMBER + 1);
if (IsEfiKeyFiFoEmpty (TerminalDevice)) {
//
// FIFO is empty
//
Output->ScanCode = SCAN_NULL;
Output->UnicodeChar = 0;
return FALSE;
}
*Output = TerminalDevice->EfiKeyFiFo->Data[Head];
TerminalDevice->EfiKeyFiFo->Head = (UINT8) ((Head + 1) % (FIFO_MAX_NUMBER + 1));
return TRUE;
}
/**
Event notification function for EFI_SIMPLE_TEXT_INPUT_PROTOCOL.WaitForKey event
Signal the event if there is key available
@param Event Indicates the event that invoke this function.
@param Context Indicates the calling context.
**/
VOID
EFIAPI
TerminalConInWaitForKey (
IN EFI_EVENT Event,
IN VOID *Context
)
{
//
// Someone is waiting on the keystroke event, if there's
// a key pending, signal the event
//
if (!IsEfiKeyFiFoEmpty ((TERMINAL_DEV *) Context)) {
gBS->SignalEvent (Event);
}
}
/**
Check for a pending key in the Efi Key FIFO or Serial device buffer.
@param This Indicates the calling context.
@retval EFI_SUCCESS There is key pending.
@retval EFI_NOT_READY There is no key pending.
@retval EFI_DEVICE_ERROR If Serial IO is not attached to serial device.
**/
EFI_STATUS
TerminalConInCheckForKey (
IN EFI_SIMPLE_TEXT_INPUT_PROTOCOL *This
)
{
EFI_STATUS Status;
TERMINAL_DEV *TerminalDevice;
UINT32 Control;
UINT8 Input;
EFI_SERIAL_IO_MODE *Mode;
EFI_SERIAL_IO_PROTOCOL *SerialIo;
UINTN SerialInTimeOut;
TerminalDevice = TERMINAL_CON_IN_DEV_FROM_THIS (This);
SerialIo = TerminalDevice->SerialIo;
if (SerialIo == NULL) {
return EFI_DEVICE_ERROR;
}
//
// if current timeout value for serial device is not identical with
// the value saved in TERMINAL_DEV structure, then recalculate the
// timeout value again and set serial attribute according to this value.
//
Mode = SerialIo->Mode;
if (Mode->Timeout != TerminalDevice->SerialInTimeOut) {
SerialInTimeOut = 0;
if (Mode->BaudRate != 0) {
//
// According to BAUD rate to calculate the timeout value.
//
SerialInTimeOut = (1 + Mode->DataBits + Mode->StopBits) * 2 * 1000000 / (UINTN) Mode->BaudRate;
}
Status = SerialIo->SetAttributes (
SerialIo,
Mode->BaudRate,
Mode->ReceiveFifoDepth,
(UINT32) SerialInTimeOut,
(EFI_PARITY_TYPE) (Mode->Parity),
(UINT8) Mode->DataBits,
(EFI_STOP_BITS_TYPE) (Mode->StopBits)
);
if (EFI_ERROR (Status)) {
TerminalDevice->SerialInTimeOut = 0;
} else {
TerminalDevice->SerialInTimeOut = SerialInTimeOut;
}
}
//
// Check whether serial buffer is empty.
//
Status = SerialIo->GetControl (SerialIo, &Control);
if ((Control & EFI_SERIAL_INPUT_BUFFER_EMPTY) != 0) {
//
// Translate all the raw data in RawFIFO into EFI Key,
// according to different terminal type supported.
//
TranslateRawDataToEfiKey (TerminalDevice);
//
// if there is pre-fetched Efi Key in EfiKeyFIFO buffer,
// return directly.
//
if (!IsEfiKeyFiFoEmpty (TerminalDevice)) {
return EFI_SUCCESS;
} else {
return EFI_NOT_READY;
}
}
//
// Fetch all the keys in the serial buffer,
// and insert the byte stream into RawFIFO.
//
do {
Status = GetOneKeyFromSerial (TerminalDevice->SerialIo, &Input);
if (EFI_ERROR (Status)) {
if (Status == EFI_DEVICE_ERROR) {
REPORT_STATUS_CODE_WITH_DEVICE_PATH (
EFI_ERROR_CODE | EFI_ERROR_MINOR,
(EFI_PERIPHERAL_REMOTE_CONSOLE | EFI_P_EC_INPUT_ERROR),
TerminalDevice->DevicePath
);
}
break;
}
RawFiFoInsertOneKey (TerminalDevice, Input);
} while (TRUE);
//
// Translate all the raw data in RawFIFO into EFI Key,
// according to different terminal type supported.
//
TranslateRawDataToEfiKey (TerminalDevice);
if (IsEfiKeyFiFoEmpty (TerminalDevice)) {
return EFI_NOT_READY;
}
return EFI_SUCCESS;
}
