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- /** @file
- Serial Port Lib that thunks back to Emulator services to write to StdErr.
- All read functions are stubed out.
- Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
- Portions copyright (c) 2011, Apple Inc. All rights reserved.<BR>
- SPDX-License-Identifier: BSD-2-Clause-Patent
- **/
- #include <PiDxe.h>
- #include <Library/SerialPortLib.h>
- #include <Library/EmuThunkLib.h>
- /**
- Initialize the serial device hardware.
- If no initialization is required, then return RETURN_SUCCESS.
- If the serial device was successfully initialized, then return RETURN_SUCCESS.
- If the serial device could not be initialized, then return RETURN_DEVICE_ERROR.
- @retval RETURN_SUCCESS The serial device was initialized.
- @retval RETURN_DEVICE_ERROR The serial device could not be initialized.
- **/
- RETURN_STATUS
- EFIAPI
- SerialPortInitialize (
- VOID
- )
- {
- return RETURN_SUCCESS;
- }
- /**
- Write data from buffer to serial device.
- Writes NumberOfBytes data bytes from Buffer to the serial device.
- The number of bytes actually written to the serial device is returned.
- If the return value is less than NumberOfBytes, then the write operation failed.
- If Buffer is NULL, then ASSERT().
- If NumberOfBytes is zero, then return 0.
- @param Buffer The pointer to the data buffer to be written.
- @param NumberOfBytes The number of bytes to written to the serial device.
- @retval 0 NumberOfBytes is 0.
- @retval >0 The number of bytes written to the serial device.
- If this value is less than NumberOfBytes, then the read operation failed.
- **/
- UINTN
- EFIAPI
- SerialPortWrite (
- IN UINT8 *Buffer,
- IN UINTN NumberOfBytes
- )
- {
- if (gEmuThunk == NULL) {
- return NumberOfBytes;
- }
- return gEmuThunk->WriteStdErr (Buffer, NumberOfBytes);
- }
- /**
- Read data from serial device and save the datas in buffer.
- Reads NumberOfBytes data bytes from a serial device into the buffer
- specified by Buffer. The number of bytes actually read is returned.
- If the return value is less than NumberOfBytes, then the rest operation failed.
- If Buffer is NULL, then ASSERT().
- If NumberOfBytes is zero, then return 0.
- @param Buffer The pointer to the data buffer to store the data read from the serial device.
- @param NumberOfBytes The number of bytes which will be read.
- @retval 0 Read data failed; No data is to be read.
- @retval >0 The actual number of bytes read from serial device.
- **/
- UINTN
- EFIAPI
- SerialPortRead (
- OUT UINT8 *Buffer,
- IN UINTN NumberOfBytes
- )
- {
- return 0;
- }
- /**
- Polls a serial device to see if there is any data waiting to be read.
- Polls a serial device to see if there is any data waiting to be read.
- If there is data waiting to be read from the serial device, then TRUE is returned.
- If there is no data waiting to be read from the serial device, then FALSE is returned.
- @retval TRUE Data is waiting to be read from the serial device.
- @retval FALSE There is no data waiting to be read from the serial device.
- **/
- BOOLEAN
- EFIAPI
- SerialPortPoll (
- VOID
- )
- {
- return FALSE;
- }
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