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/** @file
Basic serial IO abstaction for GDB
Copyright (c) 2008-2009, Apple Inc. All rights reserved.
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include <Uefi.h>
#include <Library/GdbSerialLib.h>
#include <Library/PcdLib.h>
#include <Library/IoLib.h>
#include <Library/DebugLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Protocol/DebugPort.h>
EFI_DEBUGPORT_PROTOCOL *gDebugPort = NULL;
UINTN gTimeOut = 0;
/**
The constructor function initializes the UART.
@param ImageHandle The firmware allocated handle for the EFI image.
@param SystemTable A pointer to the EFI System Table.
@retval EFI_SUCCESS The constructor always returns EFI_SUCCESS.
**/
RETURN_STATUS
EFIAPI
GdbSerialLibDebugPortConstructor (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
Status = gBS->LocateProtocol (&gEfiDebugPortProtocolGuid, NULL, (VOID **)&gDebugPort);
if (!EFI_ERROR (Status)) {
gTimeOut = PcdGet32 (PcdGdbMaxPacketRetryCount);
gDebugPort->Reset (gDebugPort);
}
return Status;
}
/**
Sets the baud rate, receive FIFO depth, transmit/receice time out, parity,
data buts, and stop bits on a serial device. This call is optional as the serial
port will be set up with defaults base on PCD values.
@param BaudRate The requested baud rate. A BaudRate value of 0 will use the the
device's default interface speed.
@param Parity The type of parity to use on this serial device. A Parity value of
DefaultParity will use the device's default parity value.
@param DataBits The number of data bits to use on the serial device. A DataBits
vaule of 0 will use the device's default data bit setting.
@param StopBits The number of stop bits to use on this serial device. A StopBits
value of DefaultStopBits will use the device's default number of
stop bits.
@retval EFI_SUCCESS The device was configured.
@retval EFI_DEVICE_ERROR The serial device could not be coonfigured.
**/
RETURN_STATUS
EFIAPI
GdbSerialInit (
IN UINT64 BaudRate,
IN UINT8 Parity,
IN UINT8 DataBits,
IN UINT8 StopBits
)
{
EFI_STATUS Status;
Status = gDebugPort->Reset (gDebugPort);
return Status;
}
/**
Check to see if a character is available from GDB. Do not read the character as that is
done via GdbGetChar().
@return TRUE - Character availible
@return FALSE - Character not availible
**/
BOOLEAN
EFIAPI
GdbIsCharAvailable (
VOID
)
{
EFI_STATUS Status;
Status = gDebugPort->Poll (gDebugPort);
return (Status == EFI_SUCCESS ? TRUE : FALSE);
}
/**
Get a character from GDB. This function must be able to run in interrupt context.
@return A character from GDB
**/
CHAR8
EFIAPI
GdbGetChar (
VOID
)
{
EFI_STATUS Status;
CHAR8 Char;
UINTN BufferSize;
do {
BufferSize = sizeof (Char);
Status = gDebugPort->Read (gDebugPort, gTimeOut, &BufferSize, &Char);
} while (EFI_ERROR (Status) || BufferSize != sizeof (Char));
return Char;
}
/**
Send a character to GDB. This function must be able to run in interrupt context.
@param Char Send a character to GDB
**/
VOID
EFIAPI
GdbPutChar (
IN CHAR8 Char
)
{
EFI_STATUS Status;
UINTN BufferSize;
do {
BufferSize = sizeof (Char);
Status = gDebugPort->Write (gDebugPort, gTimeOut, &BufferSize, &Char);
} while (EFI_ERROR (Status) || BufferSize != sizeof (Char));
return;
}
/**
Send an ASCII string to GDB. This function must be able to run in interrupt context.
@param String Send a string to GDB
**/
VOID
GdbPutString (
IN CHAR8 *String
)
{
// We could performance enhance this function by calling gDebugPort->Write ()
while (*String != '\0') {
GdbPutChar (*String);
String++;
}
}
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