/**
Read the Attach/Break-in symbols from the debug port.
@param[in] Handle Pointer to Debug Port handle.
@param[out] BreakSymbol Returned break symbol.
@retval EFI_SUCCESS Read the symbol in BreakSymbol.
@retval EFI_NOT_FOUND No read the break symbol.
**/
EFI_STATUS
DebugReadBreakSymbol (
IN DEBUG_PORT_HANDLE Handle,
OUT UINT8 *BreakSymbol
)
{
EFI_STATUS Status;
UINT8 Data;
Status = DebugTerminalFifoRemove (&mSerialFifoForDebug, &Data);
if (Status != EFI_SUCCESS) {
if (!DebugPortPollBuffer (Handle)) {
//
// No data in Debug Port buffer.
//
return EFI_NOT_FOUND;
} else {
//
// Read one character from Debug Port.
//
DebugPortReadBuffer (Handle, &Data, 1, 0);
if ((Data != DEBUG_STARTING_SYMBOL_ATTACH) && (Data != DEBUG_STARTING_SYMBOL_BREAK)) {
//
// If the data is not Break symbol, add it into Terminal FIFO
//
DebugTerminalFifoAdd (&mSerialFifoForTerminal, Data);
return EFI_NOT_FOUND;
}
}
}
*BreakSymbol = Data;
return EFI_SUCCESS;
}
/**
Read the Attach/Break-in symbols.
@param[in] Handle Pointer to Debug Port handle.
@param[out] BreakSymbol Returned break symbol.
@retval EFI_SUCCESS Read the symbol in BreakSymbol.
@retval EFI_NOT_FOUND No read the break symbol.
**/
EFI_STATUS
DebugReadBreakSymbol (
IN DEBUG_PORT_HANDLE Handle,
OUT UINT8 *BreakSymbol
)
{
EFI_STATUS Status;
UINT8 Data8;
//
// Read break symbol from debug FIFO firstly
//
Status = DebugTerminalFifoRemove (&mSerialFifoForDebug, &Data8);
if (Status == EFI_SUCCESS) {
*BreakSymbol = Data8;
return EFI_SUCCESS;
} else {
//
// Read Break symbol from debug port
//
return DebugReadBreakFromDebugPort (Handle, BreakSymbol);
}
}
/**
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;
}