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[mirror_edk2.git] / EdkModulePkg / Library / EdkUefiDebugLibStdErr / DebugLib.c

/** @file\r
  UEFI Debug Library that uses PrintLib to send messages to STDERR.\r
\r
  Copyright (c) 2006, Intel Corporation<BR>\r
  All rights reserved. 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
//\r
// Define the maximum debug and assert message length that this library supports. \r
//\r
#define MAX_DEBUG_MESSAGE_LENGTH  0x100\r
\r
STATIC BOOLEAN                   mDebugLevelInstalled = FALSE;\r
STATIC EFI_DEBUG_LEVEL_PROTOCOL  mDebugLevel = { 0 };\r
\r
/**\r
  Installs Debug Level Protocol.\r
  \r
  The constructor function installs Debug Level Protocol on the ImageHandle.\r
  It will ASSERT() if the installation fails and will always return EFI_SUCCESS. \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
EFI_STATUS\r
EFIAPI\r
DebugLibConstructor (\r
  IN EFI_HANDLE        ImageHandle,\r
  IN EFI_SYSTEM_TABLE  *SystemTable\r
  )\r
{\r
  EFI_STATUS           Status;\r
\r
  //\r
  // Initialize Debug Level Protocol.\r
  //\r
  mDebugLevel.DebugLevel = PcdGet32(PcdDebugPrintErrorLevel);\r
\r
  //\r
  // Install Debug Level Protocol. \r
  //\r
  Status = gBS->InstallMultipleProtocolInterfaces (\r
                  &ImageHandle,\r
                  &gEfiDebugLevelProtocolGuid,\r
                  &mDebugLevel,\r
                  NULL\r
                  );\r
  ASSERT_EFI_ERROR (Status);\r
\r
  //\r
  // Set flag to show that the Debug Level Protocol has been installed.\r
  //\r
  mDebugLevelInstalled = TRUE;\r
\r
  return Status;\r
}\r
\r
/**\r
\r
  Prints a debug message to the debug output device if the specified error level is enabled.\r
\r
  If any bit in ErrorLevel is also set in PcdDebugPrintErrorLevel, then print \r
  the message specified by Format and the associated variable argument list to \r
  the debug output device.\r
\r
  If Format is NULL, then ASSERT().\r
\r
  @param  ErrorLevel  The error level of the debug message.\r
  @param  Format      Format string for the debug message to print.\r
\r
**/\r
VOID\r
EFIAPI\r
DebugPrint (\r
  IN  UINTN        ErrorLevel,\r
  IN  CONST CHAR8  *Format,\r
  ...\r
  )\r
{\r
  CHAR16   Buffer[MAX_DEBUG_MESSAGE_LENGTH];\r
  VA_LIST  Marker;\r
\r
  //\r
  // If Format is NULL, then ASSERT().\r
  //\r
  ASSERT (Format != NULL);\r
\r
  //\r
  // Check driver Debug Level value and global debug level\r
  //\r
  if (mDebugLevelInstalled) {\r
    if ((ErrorLevel & mDebugLevel.DebugLevel) == 0) {\r
      return;\r
    }\r
  } else {\r
    if ((ErrorLevel & PcdGet32(PcdDebugPrintErrorLevel)) == 0) {\r
      return;\r
    }\r
  }\r
\r
  //\r
  // Convert the DEBUG() message to a Unicode String\r
  //\r
  VA_START (Marker, Format);\r
  UnicodeVSPrintAsciiFormat (Buffer, sizeof (Buffer), Format, Marker);\r
  VA_END (Marker);\r
\r
  //\r
  // Send the print string to the Standard Error device if STDERR is available.\r
  //\r
  if (gST->StdErr != NULL) {\r
    gST->StdErr->OutputString (gST->StdErr, Buffer);\r
  }\r
}\r
\r
\r
/**\r
\r
  Prints an assert message containing a filename, line number, and description.  \r
  This may be followed by a breakpoint or a dead loop.\r
\r
  Print a message of the form "ASSERT <FileName>(<LineNumber>): <Description>\n" \r
  to the debug output device.  If DEBUG_PROPERTY_ASSERT_BREAKPOINT_ENABLED bit of \r
  PcdDebugProperyMask is set then CpuBreakpoint() is called. Otherwise, if \r
  DEBUG_PROPERTY_ASSERT_DEADLOOP_ENABLED bit of PcdDebugProperyMask is set then \r
  CpuDeadLoop() is called.  If neither of these bits are set, then this function \r
  returns immediately after the message is printed to the debug output device.\r
  DebugAssert() must actively prevent recusrsion.  If DebugAssert() is called while\r
  processing another DebugAssert(), then DebugAssert() must return immediately.\r
\r
  If FileName is NULL, then a <FileName> string of "(NULL) Filename" is printed.\r
\r
  If Description is NULL, then a <Description> string of "(NULL) Description" is printed.\r
\r
  @param  FileName     Pointer to the name of the source file that generated the assert condition.\r
  @param  LineNumber   The line number in the source file that generated the assert condition\r
  @param  Description  Pointer to the description of the assert condition.\r
\r
**/\r
VOID\r
EFIAPI\r
DebugAssert (\r
  IN CONST CHAR8  *FileName,\r
  IN UINTN        LineNumber,\r
  IN CONST CHAR8  *Description\r
  )\r
{\r
  CHAR16  Buffer[MAX_DEBUG_MESSAGE_LENGTH];\r
\r
  //\r
  // Generate the ASSERT() message in Unicode format\r
  //\r
  UnicodeSPrintAsciiFormat (Buffer, sizeof (Buffer), "ASSERT %s(%d): %s\n", FileName, LineNumber, Description);\r
\r
  //\r
  // Send the print string to the Standard Error device if STDERR is available.\r
  //\r
  if (gST->StdErr != NULL) {\r
    gST->StdErr->OutputString (gST->StdErr, Buffer);\r
  }\r
\r
  //\r
  // Generate a Breakpoint, DeadLoop, or NOP based on PCD settings\r
  //\r
  if ((PcdGet8(PcdDebugPropertyMask) & DEBUG_PROPERTY_ASSERT_BREAKPOINT_ENABLED) != 0) {\r
    CpuBreakpoint ();\r
  } else if ((PcdGet8(PcdDebugPropertyMask) & DEBUG_PROPERTY_ASSERT_DEADLOOP_ENABLED) != 0) {\r
    CpuDeadLoop ();\r
  }\r
}\r
\r
\r
/**\r
\r
  Fills a target buffer with PcdDebugClearMemoryValue, and returns the target buffer.\r
\r
  This function fills Length bytes of Buffer with the value specified by \r
  PcdDebugClearMemoryValue, and returns Buffer.\r
\r
  If Buffer is NULL, then ASSERT().\r
\r