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Check the serial buffer empty status before performing the serial IO reading operation. 

Signed-off-by: niruiyu
Reviewed-by: vanjeff

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12581 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
niruiyu 2011-10-27 05:38:42 +00:00
parent bdfbe63efa
commit 59d88f42ca
1 changed files with 22 additions and 15 deletions
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37
MdeModulePkg/Universal/Console/TerminalDxe/TerminalConIn.c
View File

@ -515,6 +515,7 @@ TerminalConInTimerHandler (
{ {
EFI_STATUS Status; EFI_STATUS Status;
TERMINAL_DEV *TerminalDevice; TERMINAL_DEV *TerminalDevice;
UINT32 Control;
UINT8 Input; UINT8 Input;
EFI_SERIAL_IO_MODE *Mode; EFI_SERIAL_IO_MODE *Mode;
EFI_SERIAL_IO_PROTOCOL *SerialIo; EFI_SERIAL_IO_PROTOCOL *SerialIo;
@ -558,27 +559,33 @@ TerminalConInTimerHandler (
TerminalDevice->SerialInTimeOut = SerialInTimeOut; TerminalDevice->SerialInTimeOut = SerialInTimeOut;
} }
} }
// //
// Fetch all the keys in the serial buffer, // Check whether serial buffer is empty.
// and insert the byte stream into RawFIFO.
// //
while (!IsRawFiFoFull (TerminalDevice)) { Status = SerialIo->GetControl (SerialIo, &Control);
Status = GetOneKeyFromSerial (TerminalDevice->SerialIo, &Input); if ((Control & EFI_SERIAL_INPUT_BUFFER_EMPTY) == 0) {
//
// Fetch all the keys in the serial buffer,
// and insert the byte stream into RawFIFO.
//
while (!IsRawFiFoFull (TerminalDevice)) {
if (EFI_ERROR (Status)) { Status = GetOneKeyFromSerial (TerminalDevice->SerialIo, &Input);
if (Status == EFI_DEVICE_ERROR) {
REPORT_STATUS_CODE_WITH_DEVICE_PATH ( if (EFI_ERROR (Status)) {
EFI_ERROR_CODE | EFI_ERROR_MINOR, if (Status == EFI_DEVICE_ERROR) {
(EFI_PERIPHERAL_REMOTE_CONSOLE | EFI_P_EC_INPUT_ERROR), REPORT_STATUS_CODE_WITH_DEVICE_PATH (
TerminalDevice->DevicePath EFI_ERROR_CODE | EFI_ERROR_MINOR,
); (EFI_PERIPHERAL_REMOTE_CONSOLE | EFI_P_EC_INPUT_ERROR),
TerminalDevice->DevicePath
);
}
break;
} }
break;
}
RawFiFoInsertOneKey (TerminalDevice, Input); RawFiFoInsertOneKey (TerminalDevice, Input);
}
} }
// //