EmbeddedPkg: Fix typos in comments

[mirror_edk2.git] / EmbeddedPkg / GdbStub / SerialIo.c

/** @file\r
  Serial IO Abstraction for GDB stub. This allows an EFI consoles that shows up on the system\r
  running GDB. One consle for error information and another console for user input/output.\r
\r
  Basic packet format is $packet-data#checksum. So every comand has 4 bytes of overhead: $,\r
  #, 0, 0. The 0 and 0 are the ascii characters for the checksum.\r
\r
\r
  Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r
\r
  This program and the accompanying materials\r
  are licensed and made available under the terms and conditions of the BSD License\r
  which accompanies this distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include <GdbStubInternal.h>\r
\r
//\r
// Set TRUE if F Reply package signals a ctrl-c. We can not process the Ctrl-c\r
// here we need to wait for the periodic callback to do this.\r
//\r
BOOLEAN gCtrlCBreakFlag = FALSE;\r
\r
//\r
// If the periodic callback is called while we are processing an F packet we need\r
// to let the callback know to not read from the serail stream as it could steal\r
// characters from the F reponse packet\r
//\r
BOOLEAN gProcessingFPacket = FALSE;\r
\r
/**\r
  Process a control-C break message.\r
\r
  Currently a place holder, remove the ASSERT when it gets implemented.\r
\r
  @param  ErrNo   Error infomration from the F reply packet or other source\r
\r
**/\r
\r
VOID\r
GdbCtrlCBreakMessage (\r
  IN  UINTN ErrNo\r
  )\r
{\r
  // See D.10.5 of gdb.pdf\r
  // This should look like a break message. Should look like SIGINT\r
\r
  /* TODO: Make sure if we should do anything with ErrNo */\r
  //Turn on the global Ctrl-C flag.\r
  gCtrlCBreakFlag = TRUE;\r
}\r
\r
\r
/**\r
  Parse the F reply packet and extract the return value and an ErrNo if it exists.\r
\r
  @param  Packet  Packet to parse like an F reply packet\r
  @param  ErrNo   Buffer to hold Count bytes that were read\r
\r
  @retval -1      Error, not a valid F reply packet\r
  @retval other   Return the return code from the F reply packet\r
\r
**/\r
INTN\r
GdbParseFReplyPacket (\r
  IN  CHAR8   *Packet,\r
  OUT UINTN   *ErrNo\r
  )\r
{\r
  INTN   RetCode;\r
\r
  if (Packet[0] != 'F') {\r
    // A valid responce would be an F packet\r
    return -1;\r
  }\r
\r
  RetCode = AsciiStrHexToUintn (&Packet[1]);\r
\r
  // Find 1st comma\r
  for (;*Packet != '\0' && *Packet != ',';  Packet++);\r
  if (*Packet == '\0') {\r
    *ErrNo = 0;\r
    return RetCode;\r
  }\r
\r
  *ErrNo = AsciiStrHexToUintn (++Packet);\r
\r
  // Find 2nd comma\r
  for (;*Packet != '\0' && *Packet != ',';  Packet++);\r
  if (*Packet == '\0') {\r
    return RetCode;\r
  }\r
\r
  if (*(++Packet) == 'C') {\r
    GdbCtrlCBreakMessage (*ErrNo);\r
  }\r
\r
  return RetCode;\r
}\r
\r
\r
/**\r
  Read data from a FileDescriptor. On success number of bytes read is returned. Zero indicates\r
  the end of a file. On error -1 is returned. If count is zero, GdbRead returns zero.\r
\r
  @param  FileDescriptor   Device to talk to.\r
  @param  Buffer           Buffer to hold Count bytes that were read\r
  @param  Count            Number of bytes to transfer.\r
\r
  @retval -1               Error\r
  @retval {other}          Number of bytes read.\r
\r
**/\r
INTN\r
GdbRead (\r
  IN  INTN    FileDescriptor,\r
  OUT VOID    *Buffer,\r
  IN  UINTN   Count\r
  )\r
{\r
  CHAR8   Packet[128];\r
  UINTN   Size;\r
  INTN    RetCode;\r
  UINTN   ErrNo;\r
  BOOLEAN ReceiveDone = FALSE;\r
\r
  // Send:\r
  // "Fread,XX,YYYYYYYY,XX\r
  //\r
  // XX - FileDescriptor in ASCII\r
  // YYYYYYYY - Buffer address in ASCII\r
  // XX - Count in ASCII\r
  // SS - check sum\r
  //\r
  Size = AsciiSPrint (Packet, sizeof (Packet), "Fread,%x,%x,%x", FileDescriptor, Buffer, Count);\r
  // Packet array is too small if you got this ASSERT\r
  ASSERT (Size < sizeof (Packet));\r
\r
  gProcessingFPacket = TRUE;\r
  SendPacket (Packet);\r
  Print ((CHAR16 *)L"Packet sent..\n");\r
\r
  do {\r
    // Reply:\r
    ReceivePacket (Packet, sizeof (Packet));\r
    Print ((CHAR16 *)L"Command received..%c\n", Packet[0]);\r
\r
    // Process GDB commands\r
    switch (Packet[0]) {\r
      //Write memory command.\r
      //M addr,length:XX...\r
      case    'M':\r
        WriteToMemory (Packet);\r
        break;\r
\r
      //Fretcode, errno, Ctrl-C flag\r
      //retcode - Count read\r
      case    'F':\r
        //Once target receives F reply packet that means the previous\r
        //transactions are finished.\r
        ReceiveDone = TRUE;\r
        break;\r
\r
      //Send empty buffer\r
      default    :\r
        SendNotSupported();\r
        break;\r
    }\r
  } while (ReceiveDone == FALSE);\r
\r
  RetCode = GdbParseFReplyPacket (Packet, &ErrNo);\r
  Print ((CHAR16 *)L"RetCode: %x..ErrNo: %x..\n", RetCode, ErrNo);\r
\r
  if (ErrNo > 0) {\r
    //Send error to the host if there is any.\r
    SendError ((UINT8)ErrNo);\r
  }\r
\r
  gProcessingFPacket = FALSE;\r
\r
  return RetCode;\r
}\r
\r
\r
/**\r
  Write data to a FileDescriptor. On success number of bytes written is returned. Zero indicates\r
  nothing was written. On error -1 is returned.\r
\r
  @param  FileDescriptor   Device to talk to.\r
  @param  Buffer           Buffer to hold Count bytes that are to be written\r
  @param  Count            Number of bytes to transfer.\r
\r
  @retval -1               Error\r
  @retval {other}          Number of bytes written.\r
\r
**/\r
INTN\r
GdbWrite (\r
  IN  INTN          FileDescriptor,\r
  OUT CONST VOID    *Buffer,\r
  IN  UINTN         Count\r
  )\r
{\r
  CHAR8   Packet[128];\r
  UINTN   Size;\r
  INTN    RetCode;\r
  UINTN   ErrNo;\r
  BOOLEAN ReceiveDone = FALSE;\r
\r
  // Send:\r
  // #Fwrite,XX,YYYYYYYY,XX$SS\r
  //\r
  // XX - FileDescriptor in ASCII\r
  // YYYYYYYY - Buffer address in ASCII\r
  // XX - Count in ASCII\r
  // SS - check sum\r
  //\r
  Size = AsciiSPrint (Packet, sizeof (Packet), "Fwrite,%x,%x,%x", FileDescriptor, Buffer, Count);\r
  // Packet array is too small if you got this ASSERT\r
  ASSERT (Size < sizeof (Packet));\r
\r
  SendPacket (Packet);\r
  Print ((CHAR16 *)L"Packet sent..\n");\r
\r
  do {\r
    // Reply:\r
    ReceivePacket (Packet, sizeof (Packet));\r
    Print ((CHAR16 *)L"Command received..%c\n", Packet[0]);\r
\r
    // Process GDB commands\r
    switch (Packet[0]) {\r
      //Read memory command.\r
      //m addr,length.\r
      case    'm':\r
        ReadFromMemory (Packet);\r
        break;\r
\r
      //Fretcode, errno, Ctrl-C flag\r
      //retcode - Count read\r
      case    'F':\r
        //Once target receives F reply packet that means the previous\r
        //transactions are finished.\r
        ReceiveDone = TRUE;\r
        break;\r
\r
      //Send empty buffer\r
      default    :\r
        SendNotSupported();\r
        break;\r
    }\r
  } while (ReceiveDone == FALSE);\r
\r
  RetCode = GdbParseFReplyPacket (Packet, &ErrNo);\r
  Print ((CHAR16 *)L"RetCode: %x..ErrNo: %x..\n", RetCode, ErrNo);\r
\r
  //Send error to the host if there is any.\r
  if (ErrNo > 0) {\r
    SendError((UINT8)ErrNo);\r
  }\r
\r
  return RetCode;\r
}\r
\r
\r
/**\r
  Reset the serial device.\r
\r
  @param  This              Protocol instance pointer.\r
\r
  @retval EFI_SUCCESS       The device was reset.\r
  @retval EFI_DEVICE_ERROR  The serial device could not be reset.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
GdbSerialReset (\r
  IN EFI_SERIAL_IO_PROTOCOL  *This\r
  )\r
{\r
  return EFI_SUCCESS;\r
}\r
\r
\r
/**\r
  Sets the baud rate, receive FIFO depth, transmit/receice time out, parity,\r
  data buts, and stop bits on a serial device.\r
\r
  @param  This             Protocol instance pointer.\r
  @param  BaudRate         The requested baud rate. A BaudRate value of 0 will use the the\r
                           device's default interface speed.\r
  @param  ReveiveFifoDepth The requested depth of the FIFO on the receive side of the\r
                           serial interface. A ReceiveFifoDepth value of 0 will use\r
                           the device's dfault FIFO depth.\r
  @param  Timeout          The requested time out for a single character in microseconds.\r
                           This timeout applies to both the transmit and receive side of the\r
                           interface. A Timeout value of 0 will use the device's default time\r
                           out value.\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
                           vaule 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 reset.\r
  @retval EFI_DEVICE_ERROR The serial device could not be reset.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
GdbSerialSetAttributes (\r
  IN EFI_SERIAL_IO_PROTOCOL  *This,\r
  IN UINT64                  BaudRate,\r
  IN UINT32                  ReceiveFifoDepth,\r
  IN UINT32                  Timeout,\r
  IN EFI_PARITY_TYPE         Parity,\r
  IN UINT8                   DataBits,\r
  IN EFI_STOP_BITS_TYPE      StopBits\r
  )\r
{\r
  return EFI_UNSUPPORTED;\r
}\r
\r
\r
/**\r
  Set the control bits on a serial device\r
\r
  @param  This             Protocol instance pointer.\r
  @param  Control          Set the bits of Control that are settable.\r
\r
  @retval EFI_SUCCESS      The new control bits were set on the serial device.\r
  @retval EFI_UNSUPPORTED  The serial device does not support this operation.\r
  @retval EFI_DEVICE_ERROR The serial device is not functioning correctly.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
GdbSerialSetControl (\r
  IN EFI_SERIAL_IO_PROTOCOL  *This,\r
  IN UINT32                  Control\r
  )\r
{\r
  return EFI_UNSUPPORTED;\r
}\r
\r
\r
/**\r
  Retrieves the status of thecontrol bits on a serial device\r
\r
  @param  This              Protocol instance pointer.\r
  @param  Control           A pointer to return the current Control signals from the serial device.\r
\r
  @retval EFI_SUCCESS       The control bits were read from the serial device.\r
  @retval EFI_DEVICE_ERROR  The serial device is not functioning correctly.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
GdbSerialGetControl (\r
  IN EFI_SERIAL_IO_PROTOCOL  *This,\r
  OUT UINT32                 *Control\r
  )\r
{\r
  return EFI_UNSUPPORTED;\r
}\r
\r
\r
/**\r
  Writes data to a serial device.\r
\r
  @param  This              Protocol instance pointer.\r
  @param  BufferSize        On input, the size of the Buffer. On output, the amount of\r
                            data actually written.\r
  @param  Buffer            The buffer of data to write\r
\r
  @retval EFI_SUCCESS       The data was written.\r
  @retval EFI_DEVICE_ERROR  The device reported an error.\r
  @retval EFI_TIMEOUT       The data write was stopped due to a timeout.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
GdbSerialWrite (\r
  IN EFI_SERIAL_IO_PROTOCOL  *This,\r
  IN OUT UINTN               *BufferSize,\r
  IN VOID                    *Buffer\r
  )\r
{\r
  GDB_SERIAL_DEV  *SerialDev;\r
  UINTN            Return;\r
\r
  SerialDev = GDB_SERIAL_DEV_FROM_THIS (This);\r
\r
  Return = GdbWrite (SerialDev->OutFileDescriptor, Buffer, *BufferSize);\r
  if (Return == (UINTN)-1) {\r
    return EFI_DEVICE_ERROR;\r
  }\r
\r
  if (Return != *BufferSize) {\r
    *BufferSize = Return;\r
  }\r
\r
  return EFI_SUCCESS;\r
}\r
\r
/**\r
  Writes data to a serial device.\r
\r
  @param  This              Protocol instance pointer.\r
  @param  BufferSize        On input, the size of the Buffer. On output, the amount of\r
                            data returned in Buffer.\r
  @param  Buffer            The buffer to return the data into.\r
\r
  @retval EFI_SUCCESS       The data was read.\r
  @retval EFI_DEVICE_ERROR  The device reported an error.\r
  @retval EFI_TIMEOUT       The data write was stopped due to a timeout.\r
\r
**/\r
\r
EFI_STATUS\r
EFIAPI\r
GdbSerialRead (\r
  IN EFI_SERIAL_IO_PROTOCOL  *This,\r
  IN OUT UINTN               *BufferSize,\r
  OUT VOID                   *Buffer\r
  )\r
{\r
  GDB_SERIAL_DEV  *SerialDev;\r
  UINTN            Return;\r
\r
  SerialDev = GDB_SERIAL_DEV_FROM_THIS (This);\r
\r
  Return = GdbRead (SerialDev->InFileDescriptor, Buffer, *BufferSize);\r
  if (Return == (UINTN)-1) {\r
    return EFI_DEVICE_ERROR;\r
  }\r
\r
  if (Return != *BufferSize) {\r
    *BufferSize = Return;\r
  }\r
\r
  return EFI_SUCCESS;\r
}\r
\r
\r
//\r
// Template used to initailize the GDB Serial IO protocols\r
//\r
GDB_SERIAL_DEV gdbSerialDevTemplate = {\r
  GDB_SERIAL_DEV_SIGNATURE,\r
  NULL,\r
\r
  { // SerialIo\r
    SERIAL_IO_INTERFACE_REVISION,\r
    GdbSerialReset,\r
    GdbSerialSetAttributes,\r
    GdbSerialSetControl,\r
    GdbSerialGetControl,\r
    GdbSerialWrite,\r
    GdbSerialRead,\r
    NULL\r
  },\r
  { // SerialMode\r
    0,      // ControlMask\r
    0,      // Timeout\r
    0,      // BaudRate\r
    1,      // RceiveFifoDepth\r
    0,      // DataBits\r
    0,      // Parity\r
    0       // StopBits\r
  },\r
  {\r
    {\r
      {\r
        HARDWARE_DEVICE_PATH,\r
        HW_VENDOR_DP,\r
        {\r
          (UINT8) (sizeof (VENDOR_DEVICE_PATH) + sizeof (UINT32)),\r
          (UINT8) ((sizeof (VENDOR_DEVICE_PATH) + sizeof (UINT32)) >> 8)\r
        },\r
      },\r
      EFI_SERIAL_IO_PROTOCOL_GUID\r
    },\r
    0,\r
    {\r
      END_DEVICE_PATH_TYPE,\r
      END_ENTIRE_DEVICE_PATH_SUBTYPE,\r
      {\r
        (UINT8) (sizeof (EFI_DEVICE_PATH_PROTOCOL)),\r
        (UINT8) (sizeof (EFI_DEVICE_PATH_PROTOCOL) >> 8)\r
      }\r
    },\r
  },\r
  GDB_STDIN,\r
  GDB_STDOUT\r
};\r
\r
\r
/**\r
  Make two serial consoles: 1) StdIn and StdOut via GDB. 2) StdErr via GDB.\r
\r
  These console show up on the remote system running GDB\r
\r
**/\r
VOID\r
GdbInitializeSerialConsole (\r
  VOID\r
  )\r
{\r
  EFI_STATUS      Status;\r
  GDB_SERIAL_DEV  *StdOutSerialDev;\r
  GDB_SERIAL_DEV  *StdErrSerialDev;\r
\r
  // Use the template to make a copy of the Serial Console private data structure.\r
  StdOutSerialDev = AllocateCopyPool (sizeof (GDB_SERIAL_DEV),  &gdbSerialDevTemplate);\r
  ASSERT (StdOutSerialDev != NULL);\r
\r
  // Fixup pointer after the copy\r
  StdOutSerialDev->SerialIo.Mode = &StdOutSerialDev->SerialMode;\r
\r
  StdErrSerialDev = AllocateCopyPool (sizeof (GDB_SERIAL_DEV),  &gdbSerialDevTemplate);\r
  ASSERT (StdErrSerialDev != NULL);\r
\r
  // Fixup pointer and modify stuff that is different for StdError\r
  StdErrSerialDev->SerialIo.Mode = &StdErrSerialDev->SerialMode;\r
  StdErrSerialDev->DevicePath.Index = 1;\r
  StdErrSerialDev->OutFileDescriptor = GDB_STDERR;\r
\r
  // Make a new handle with Serial IO protocol and its device path on it.\r
  Status = gBS->InstallMultipleProtocolInterfaces (\r
                  &StdOutSerialDev->Handle,\r
                  &gEfiSerialIoProtocolGuid,   &StdOutSerialDev->SerialIo,\r
                  &gEfiDevicePathProtocolGuid, &StdOutSerialDev->DevicePath,\r
                  NULL\r
                  );\r
  ASSERT_EFI_ERROR (Status);\r
\r
  // Make a new handle with Serial IO protocol and its device path on it.\r
  Status = gBS->InstallMultipleProtocolInterfaces (\r
                  &StdErrSerialDev->Handle,\r
                  &gEfiSerialIoProtocolGuid,   &StdErrSerialDev->SerialIo,\r
                  &gEfiDevicePathProtocolGuid, &StdErrSerialDev->DevicePath,\r
                  NULL\r
                  );\r
  ASSERT_EFI_ERROR (Status);\r
}\r
\r