EmbeddedPkg/GdbSerialDebugPortLib: fix compile warning

[mirror_edk2.git] / EmbeddedPkg / Library / GdbSerialDebugPortLib / GdbSerialDebugPortLib.c

/** @file\r
  Basic serial IO abstraction for GDB\r
\r
  Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r
\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include <Uefi.h>\r
#include <Library/GdbSerialLib.h>\r
#include <Library/PcdLib.h>\r
#include <Library/IoLib.h>\r
#include <Library/DebugLib.h>\r
#include <Library/UefiBootServicesTableLib.h>\r
\r
#include <Protocol/DebugPort.h>\r
\r
EFI_DEBUGPORT_PROTOCOL  *gDebugPort = NULL;\r
UINT32                  gTimeOut    = 0;\r
\r
/**\r
  The constructor function initializes the UART.\r
\r
  @param  ImageHandle   The firmware allocated handle for the EFI image.\r
  @param  SystemTable   A pointer to the EFI System Table.\r
\r
  @retval EFI_SUCCESS   The constructor always returns EFI_SUCCESS.\r
\r
**/\r
RETURN_STATUS\r
EFIAPI\r
GdbSerialLibDebugPortConstructor (\r
  IN EFI_HANDLE        ImageHandle,\r
  IN EFI_SYSTEM_TABLE  *SystemTable\r
  )\r
{\r
  EFI_STATUS  Status;\r
\r
  Status = gBS->LocateProtocol (&gEfiDebugPortProtocolGuid, NULL, (VOID **)&gDebugPort);\r
  if (!EFI_ERROR (Status)) {\r
    gTimeOut = PcdGet32 (PcdGdbMaxPacketRetryCount);\r
    gDebugPort->Reset (gDebugPort);\r
  }\r
\r
  return Status;\r
}\r
\r
/**\r
  Sets the baud rate, receive FIFO depth, transmit/receive time out, parity,\r
  data buts, and stop bits on a serial device. This call is optional as the serial\r
  port will be set up with defaults base on PCD values.\r
\r
  @param  BaudRate         The requested baud rate. A BaudRate value of 0 will use the\r
                           device's default interface speed.\r
  @param  Parity           The type of parity to use on this serial device. A Parity value of\r
                           DefaultParity will use the device's default parity value.\r
  @param  DataBits         The number of data bits to use on the serial device. A DataBits\r
                           value of 0 will use the device's default data bit setting.\r
  @param  StopBits         The number of stop bits to use on this serial device. A StopBits\r
                           value of DefaultStopBits will use the device's default number of\r
                           stop bits.\r
\r
  @retval EFI_SUCCESS      The device was configured.\r
  @retval EFI_DEVICE_ERROR The serial device could not be configured.\r
\r
**/\r
RETURN_STATUS\r
EFIAPI\r
GdbSerialInit (\r
  IN UINT64  BaudRate,\r
  IN UINT8   Parity,\r
  IN UINT8   DataBits,\r
  IN UINT8   StopBits\r
  )\r
{\r
  EFI_STATUS  Status;\r
\r
  Status = gDebugPort->Reset (gDebugPort);\r
  return Status;\r
}\r
\r
/**\r
  Check to see if a character is available from GDB. Do not read the character as that is\r
  done via GdbGetChar().\r
\r
  @return TRUE  - Character available\r
  @return FALSE - Character not available\r
\r
**/\r
BOOLEAN\r
EFIAPI\r
GdbIsCharAvailable (\r
  VOID\r
  )\r
{\r
  EFI_STATUS  Status;\r
\r
  Status = gDebugPort->Poll (gDebugPort);\r
\r
  return (Status == EFI_SUCCESS ? TRUE : FALSE);\r
}\r
\r
/**\r
  Get a character from GDB. This function must be able to run in interrupt context.\r
\r
  @return A character from GDB\r
\r
**/\r
CHAR8\r
EFIAPI\r
GdbGetChar (\r
  VOID\r
  )\r
{\r
  EFI_STATUS  Status;\r
  CHAR8       Char;\r
  UINTN       BufferSize;\r
\r
  do {\r
    BufferSize = sizeof (Char);\r
    Status     = gDebugPort->Read (gDebugPort, gTimeOut, &BufferSize, &Char);\r
  } while (EFI_ERROR (Status) || BufferSize != sizeof (Char));\r
\r
  return Char;\r
}\r
\r
/**\r
  Send a character to GDB. This function must be able to run in interrupt context.\r
\r
\r
  @param  Char    Send a character to GDB\r
\r
**/\r
VOID\r
EFIAPI\r
GdbPutChar (\r
  IN  CHAR8  Char\r
  )\r
{\r
  EFI_STATUS  Status;\r
  UINTN       BufferSize;\r
\r
  do {\r
    BufferSize = sizeof (Char);\r
    Status     = gDebugPort->Write (gDebugPort, gTimeOut, &BufferSize, &Char);\r
  } while (EFI_ERROR (Status) || BufferSize != sizeof (Char));\r
\r
  return;\r
}\r
\r
/**\r
  Send an ASCII string to GDB. This function must be able to run in interrupt context.\r
\r
\r
  @param  String    Send a string to GDB\r
\r
**/\r
VOID\r
GdbPutString (\r
  IN CHAR8  *String\r
  )\r
{\r
  // We could performance enhance this function by calling gDebugPort->Write ()\r
  while (*String != '\0') {\r
    GdbPutChar (*String);\r
    String++;\r
  }\r
}\r