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/** @file
Serial I/O Port library functions with no library constructor/destructor
Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
Copyright (c) 2021, Arm Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Uefi.h>
#include <Library/DebugLib.h>
#include <Library/SemihostLib.h>
#include <Library/SerialPortLib.h>
/*
Programmed hardware of Serial port.
@return Always return EFI_UNSUPPORTED.
**/
RETURN_STATUS
EFIAPI
SerialPortInitialize (
VOID
)
{
if (SemihostConnectionSupported ()) {
return RETURN_SUCCESS;
} else {
return RETURN_UNSUPPORTED;
}
}
/**
Write data to serial device.
@param Buffer Point of data buffer which need to be written.
@param NumberOfBytes Number of output bytes which are cached in Buffer.
@retval 0 Write data failed.
@retval !0 Actual number of bytes written to serial device.
**/
#define PRINT_BUFFER_SIZE 512
#define PRINT_BUFFER_THRESHOLD (PRINT_BUFFER_SIZE - 4)
UINTN
EFIAPI
SerialPortWrite (
IN UINT8 *Buffer,
IN UINTN NumberOfBytes
)
{
UINT8 PrintBuffer[PRINT_BUFFER_SIZE];
UINTN SourceIndex;
UINTN DestinationIndex;
UINT8 CurrentCharacter;
SourceIndex = 0;
DestinationIndex = 0;
while (SourceIndex < NumberOfBytes) {
CurrentCharacter = Buffer[SourceIndex++];
switch (CurrentCharacter) {
case '\r':
continue;
case '\n':
PrintBuffer[DestinationIndex++] = ' ';
// fall through
default:
PrintBuffer[DestinationIndex++] = CurrentCharacter;
break;
}
if (DestinationIndex > PRINT_BUFFER_THRESHOLD) {
PrintBuffer[DestinationIndex] = '\0';
SemihostWriteString ((CHAR8 *)PrintBuffer);
DestinationIndex = 0;
}
}
if (DestinationIndex > 0) {
PrintBuffer[DestinationIndex] = '\0';
SemihostWriteString ((CHAR8 *)PrintBuffer);
}
return NumberOfBytes;
}
/**
Read data from serial device and save the datas in buffer.
@param Buffer Point of data buffer which need to be written.
@param NumberOfBytes Number of output bytes which are cached in Buffer.
@retval 0 Read data failed.
@retval !0 Actual number of bytes read from serial device.
**/
UINTN
EFIAPI
SerialPortRead (
OUT UINT8 *Buffer,
IN UINTN NumberOfBytes
)
{
*Buffer = SemihostReadCharacter ();
return 1;
}
/**
Check to see if any data is available to be read from the debug device.
@retval TRUE At least one byte of data is available to be read
@retval FALSE No data is available to be read
**/
BOOLEAN
EFIAPI
SerialPortPoll (
VOID
)
{
// Since SemiHosting read character is blocking always say we have a char ready?
return SemihostConnectionSupported ();
}
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