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/** @file
Basic serial IO abstraction for GDB
Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#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;
UINT32 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/receive 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
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
value 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 configured.
**/
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 available
@return FALSE - Character not available
**/
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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