/**
Write the specified number of bytes to serial device.
@param[in] This Pointer to EFI_SERIAL_IO_PROTOCOL.
@param[in, out] BufferSize On input the size of Buffer, on output the amount of
data actually written.
@param[in] Buffer The buffer of data to write.
@retval EFI_SUCCESS The data were written successfully.
@retval EFI_DEVICE_ERROR The device reported an error.
@retval EFI_TIMEOUT The write operation was stopped due to timeout.
**/
EFI_STATUS
EFIAPI
SerialWrite (
IN EFI_SERIAL_IO_PROTOCOL *This,
IN OUT UINTN *BufferSize,
IN VOID *Buffer
)
{
DEBUG_PORT_HANDLE Handle;
Handle = GetDebugPortHandle ();
if ((mSerialIoMode.ControlMask & EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE) != 0) {
if (*BufferSize == 0) {
return EFI_SUCCESS;
}
if ((mLoopbackBuffer & SERIAL_PORT_LOOPBACK_BUFFER_FULL) != 0) {
*BufferSize = 0;
return EFI_TIMEOUT;
}
mLoopbackBuffer = SERIAL_PORT_LOOPBACK_BUFFER_FULL | *(UINT8 *)Buffer;
*BufferSize = 1;
} else {
*BufferSize = DebugPortWriteBuffer (Handle, Buffer, *BufferSize);
}
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;
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;
}
/**
Write the specified number of bytes to serial device.
@param[in] This Pointer to EFI_SERIAL_IO_PROTOCOL.
@param[in, out] BufferSize On input the size of Buffer, on output the amount of
data actually written.
@param[in] Buffer The buffer of data to write.
@retval EFI_SUCCESS The data were written successfully.
@retval EFI_DEVICE_ERROR The device reported an error.
@retval EFI_TIMEOUT The write operation was stopped due to timeout.
**/
EFI_STATUS
EFIAPI
SerialWrite (
IN EFI_SERIAL_IO_PROTOCOL *This,
IN OUT UINTN *BufferSize,
IN VOID *Buffer
)
{
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 ();
if ((mSerialIoMode.ControlMask & EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE) != 0) {
if (*BufferSize == 0) {
return EFI_SUCCESS;
}
if ((mLoopbackBuffer & SERIAL_PORT_LOOPBACK_BUFFER_FULL) != 0) {
*BufferSize = 0;
return EFI_TIMEOUT;
}
mLoopbackBuffer = SERIAL_PORT_LOOPBACK_BUFFER_FULL | *(UINT8 *)Buffer;
*BufferSize = 1;
} else {
*BufferSize = DebugPortWriteBuffer (Handle, Buffer, *BufferSize);
}
//
// Restore Debug Timer interrupt
//
SaveAndSetDebugTimerInterrupt (DebugTimerInterruptState);
//
// Restore to original TPL
//
gBS->RestoreTPL (Tpl);
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;
}
/**
Read the specified number of bytes from serial device.
@param[in] This Pointer to EFI_SERIAL_IO_PROTOCOL.
@param[in, out] BufferSize On input the size of Buffer, on output the amount of
data returned in buffer.
@param[out] Buffer The buffer to return the data into.
@retval EFI_SUCCESS The data were read successfully.
@retval EFI_DEVICE_ERROR The device reported an error.
@retval EFI_TIMEOUT The read operation was stopped due to timeout.
**/
EFI_STATUS
EFIAPI
SerialRead (
IN EFI_SERIAL_IO_PROTOCOL *This,
IN OUT UINTN *BufferSize,
OUT VOID *Buffer
)
{
EFI_STATUS Status;
UINTN Index;
UINT8 *Uint8Buffer;
BOOLEAN DebugTimerInterruptState;
EFI_TPL Tpl;
DEBUG_PORT_HANDLE Handle;
DEBUG_PACKET_HEADER DebugHeader;
UINT8 *Data8;
//
// 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 ();
Data8 = (UINT8 *) &DebugHeader;
Uint8Buffer = (UINT8 *)Buffer;
if ((mSerialIoMode.ControlMask & EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE) != 0) {
if ((mLoopbackBuffer & SERIAL_PORT_LOOPBACK_BUFFER_FULL) == 0) {
return EFI_TIMEOUT;
}
*Uint8Buffer = (UINT8)(mLoopbackBuffer & 0xff);
mLoopbackBuffer = 0;
*BufferSize = 1;
} else {
for (Index = 0; Index < *BufferSize; Index++) {
//
// Read input character from terminal FIFO firstly
//
Status = DebugTerminalFifoRemove (&mSerialFifoForTerminal, Data8);
if (Status == EFI_SUCCESS) {
*Uint8Buffer = *Data8;
Uint8Buffer ++;
continue;
}
//
// Read the input character from Debug Port
//
if (!DebugPortPollBuffer (Handle)) {
break;
}
DebugPortReadBuffer (Handle, Data8, 1, 0);
if (*Data8 == DEBUG_STARTING_SYMBOL_ATTACH) {
//
// Add the debug symbol into Debug FIFO
//
DebugAgentMsgPrint (DEBUG_AGENT_INFO, "Terminal Timer attach symbol received %x", *Data8);
DebugTerminalFifoAdd (&mSerialFifoForDebug, *Data8);
} else if (*Data8 == DEBUG_STARTING_SYMBOL_NORMAL) {
Status = ReadRemainingBreakPacket (Handle, &DebugHeader);
if (Status == EFI_SUCCESS) {
DebugAgentMsgPrint (DEBUG_AGENT_INFO, "Terminal Timer break symbol received %x", DebugHeader.Command);
DebugTerminalFifoAdd (&mSerialFifoForDebug, DebugHeader.Command);
}
if (Status == EFI_TIMEOUT) {
continue;
}
} else {
*Uint8Buffer = *Data8;
Uint8Buffer ++;
}
}
*BufferSize = (UINTN)Uint8Buffer - (UINTN)Buffer;
}
//
// Restore Debug Timer interrupt
//
SaveAndSetDebugTimerInterrupt (DebugTimerInterruptState);
//
// Restore to original TPL
//
gBS->RestoreTPL (Tpl);
return EFI_SUCCESS;
}
/**
Read the specified number of bytes from serial device.
@param[in] This Pointer to EFI_SERIAL_IO_PROTOCOL.
@param[in, out] BufferSize On input the size of Buffer, on output the amount of
data returned in buffer.
@param[out] Buffer The buffer to return the data into.
@retval EFI_SUCCESS The data were read successfully.
@retval EFI_DEVICE_ERROR The device reported an error.
@retval EFI_TIMEOUT The read operation was stopped due to timeout.
**/
EFI_STATUS
EFIAPI
SerialRead (
IN EFI_SERIAL_IO_PROTOCOL *This,
IN OUT UINTN *BufferSize,
OUT VOID *Buffer
)
{
EFI_STATUS Status;
UINTN Index;
UINT8 *Uint8Buffer;
BOOLEAN OldInterruptState;
DEBUG_PORT_HANDLE Handle;
UINT8 Data;
Handle = GetDebugPortHandle ();
//
// Save and disable Debug Timer interrupt to avoid it to access Debug Port
//
OldInterruptState = SaveAndSetDebugTimerInterrupt (FALSE);
Uint8Buffer = (UINT8 *)Buffer;
if ((mSerialIoMode.ControlMask & EFI_SERIAL_SOFTWARE_LOOPBACK_ENABLE) != 0) {
if ((mLoopbackBuffer & SERIAL_PORT_LOOPBACK_BUFFER_FULL) == 0) {
return EFI_TIMEOUT;
}
*Uint8Buffer = (UINT8)(mLoopbackBuffer & 0xff);
mLoopbackBuffer = 0;
*BufferSize = 1;
} else {
for (Index = 0; Index < *BufferSize; Index++) {
//
// Read input character from terminal FIFO firstly
//
Status = DebugTerminalFifoRemove (&mSerialFifoForTerminal, &Data);
if (Status == EFI_SUCCESS) {
*Uint8Buffer = Data;
Uint8Buffer ++;
continue;
}
//
// Read the input character from Debug Port
//
if (!DebugPortPollBuffer (Handle)) {
break;
}
DebugPortReadBuffer (Handle, &Data, 1, 0);
if (Data== DEBUG_STARTING_SYMBOL_ATTACH ||
Data == DEBUG_STARTING_SYMBOL_BREAK) {
//
// Add the debug symbol into Debug FIFO
//
DebugTerminalFifoAdd (&mSerialFifoForDebug, Data);
} else {
*Uint8Buffer = Data;
Uint8Buffer ++;
}
}
*BufferSize = (UINTN)Uint8Buffer - (UINTN)Buffer;
}
//
// Restore Debug Timer interrupt
//
SaveAndSetDebugTimerInterrupt (OldInterruptState);
return EFI_SUCCESS;
}
