[mirror_edk2.git] / EmbeddedPkg / Ebl / Main.c

/** @file\r
  Basic command line parser for EBL (Embedded Boot Loader)\r
\r
  Copyright (c) 2007, Intel Corporation. All rights reserved.<BR>\r
  Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>\r
  (C) Copyright 2015 Hewlett Packard Enterprise Development LP<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
\r
#include "Ebl.h"\r
\r
// Globals for command history processing\r
INTN mCmdHistoryEnd     = -1;\r
INTN mCmdHistoryStart   = -1;\r
INTN mCmdHistoryCurrent = -1;\r
CHAR8 mCmdHistory[MAX_CMD_HISTORY][MAX_CMD_LINE];\r
CHAR8 *mCmdBlank = "";\r
\r
// Globals to remember current screen geometry\r
UINTN gScreenColumns;\r
UINTN gScreenRows;\r
\r
// Global to turn on/off breaking commands with prompts before they scroll the screen\r
BOOLEAN gPageBreak = TRUE;\r
\r
VOID\r
RingBufferIncrement (\r
  IN  INTN  *Value\r
  )\r
{\r
  *Value = *Value + 1;\r
\r
  if (*Value >= MAX_CMD_HISTORY) {\r
    *Value = 0;\r
  }\r
}\r
\r
VOID\r
RingBufferDecrement (\r
  IN  INTN  *Value\r
  )\r
{\r
  *Value = *Value - 1;\r
\r
  if (*Value < 0) {\r
    *Value = MAX_CMD_HISTORY - 1;\r
  }\r
}\r
\r
/**\r
  Save this command in the circular history buffer. Older commands are\r
  overwritten with newer commands.\r
\r
  @param  Cmd   Command line to archive the history of.\r
\r
  @return None\r
\r
**/\r
VOID\r
SetCmdHistory (\r
  IN  CHAR8 *Cmd\r
  )\r
{\r
  // Don't bother adding empty commands to the list\r
  if (AsciiStrLen(Cmd) != 0) {\r
\r
    // First entry\r
    if (mCmdHistoryStart == -1) {\r
      mCmdHistoryStart   = 0;\r
      mCmdHistoryEnd     = 0;\r
    } else {\r
      // Record the new command at the next index\r
      RingBufferIncrement(&mCmdHistoryStart);\r
\r
      // If the next index runs into the end index, shuffle end back by one\r
      if (mCmdHistoryStart == mCmdHistoryEnd) {\r
        RingBufferIncrement(&mCmdHistoryEnd);\r
      }\r
    }\r
\r
    // Copy the new command line into the ring buffer\r
    AsciiStrnCpyS (&mCmdHistory[mCmdHistoryStart][0], MAX_CMD_LINE, Cmd, MAX_CMD_LINE);\r
  }\r
\r
  // Reset the command history for the next up arrow press\r
  mCmdHistoryCurrent = mCmdHistoryStart;\r
}\r
\r
\r
/**\r
  Retreave data from the Command History buffer. Direction maps into up arrow\r
  an down arrow on the command line\r
\r
  @param  Direction  Command forward or back\r
\r
  @return The Command history based on the Direction\r
\r
**/\r
CHAR8 *\r
GetCmdHistory (\r
  IN UINT16   Direction\r
  )\r
{\r
  CHAR8 *HistoricalCommand = NULL;\r
\r
  // No history yet?\r
  if (mCmdHistoryCurrent == -1) {\r
    HistoricalCommand = mCmdBlank;\r
    goto Exit;\r
  }\r
\r
  if (Direction == SCAN_UP) {\r
    HistoricalCommand = &mCmdHistory[mCmdHistoryCurrent][0];\r
\r
    // if we just echoed the last command, hang out there, don't wrap around\r
    if (mCmdHistoryCurrent == mCmdHistoryEnd) {\r
      goto Exit;\r
    }\r
\r
    // otherwise, back up by one\r
    RingBufferDecrement(&mCmdHistoryCurrent);\r
\r
  } else if (Direction == SCAN_DOWN) {\r
\r
    // if we last echoed the start command, put a blank prompt out\r
    if (mCmdHistoryCurrent == mCmdHistoryStart) {\r
      HistoricalCommand = mCmdBlank;\r
      goto Exit;\r
    }\r
\r
    // otherwise increment the current pointer and return that command\r
    RingBufferIncrement(&mCmdHistoryCurrent);\r
    RingBufferIncrement(&mCmdHistoryCurrent);\r
\r
    HistoricalCommand = &mCmdHistory[mCmdHistoryCurrent][0];\r
    RingBufferDecrement(&mCmdHistoryCurrent);\r
  }\r
\r
Exit:\r
  return HistoricalCommand;\r
}\r
\r
\r
/**\r
  Parse the CmdLine and break it up into Argc (arg count) and Argv (array of\r
  pointers to each argument). The Cmd buffer is altered and separators are\r
  converted to string terminators. This allows Argv to point into CmdLine.\r
  A CmdLine can support multiple commands. The next command in the command line\r
  is returned if it exists.\r
\r
  @param  CmdLine String to parse for a set of commands\r
  @param  Argc    Returns the number of arguments in the CmdLine current command\r
  @param  Argv    Argc pointers to each string in CmdLine\r
\r
  @return Next Command in the command line or NULL if non exists\r
**/\r
CHAR8 *\r
ParseArguments (\r
  IN  CHAR8  *CmdLine,\r
  OUT UINTN  *Argc,\r
  OUT CHAR8  **Argv\r
  )\r
{\r
  UINTN   Arg;\r
  CHAR8   *Char;\r
  BOOLEAN LookingForArg;\r
  BOOLEAN InQuote;\r
\r
  *Argc = 0;\r
  if (AsciiStrLen (CmdLine) == 0) {\r
    return NULL;\r
  }\r
\r
  // Walk a single command line. A CMD_SEPARATOR allows multiple commands on a single line\r
  InQuote       = FALSE;\r
  LookingForArg = TRUE;\r
  for (Char = CmdLine, Arg = 0; *Char != '\0'; Char++) {\r
    if (!InQuote && *Char == CMD_SEPARATOR) {\r
      break;\r
    }\r
\r
    // Perform any text conversion here\r
    if (*Char == '\t') {\r
      // TAB to space\r
      *Char = ' ';\r
    }\r
\r
    if (LookingForArg) {\r
      // Look for the beginning of an Argv[] entry\r
      if (*Char == '"') {\r
        Argv[Arg++] = ++Char;\r
        LookingForArg = FALSE;\r
        InQuote = TRUE;\r
      } else if (*Char != ' ') {\r
        Argv[Arg++] = Char;\r
        LookingForArg = FALSE;\r
      }\r
    } else {\r
      // Looking for the terminator of an Argv[] entry\r
      if (!InQuote && (*Char == ' ')) {\r
        *Char = '\0';\r
        LookingForArg = TRUE;\r
      } else if (!InQuote && (*Char == '"') && (*(Char-1) != '\\')) {\r
        InQuote = TRUE;\r
      } else if (InQuote && (*Char == '"') && (*(Char-1) != '\\')) {\r
        *Char = '\0';\r
        InQuote = FALSE;\r
      }\r
    }\r
  }\r
\r
  *Argc = Arg;\r
\r
  if (*Char == CMD_SEPARATOR) {\r
    // Replace the command delimiter with null and return pointer to next command line\r
    *Char = '\0';\r
    return ++Char;\r
  }\r
\r
  return NULL;\r
}\r
\r
\r
/**\r
  Return a keypress or optionally timeout if a timeout value was passed in.\r
  An optional callback function is called every second when waiting for a\r
  timeout.\r
\r
  @param  Key           EFI Key information returned\r
  @param  TimeoutInSec  Number of seconds to wait to timeout\r
  @param  CallBack      Callback called every second during the timeout wait\r
\r
  @return EFI_SUCCESS  Key was returned\r
  @return EFI_TIMEOUT  If the TimoutInSec expired\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
EblGetCharKey (\r
  IN OUT EFI_INPUT_KEY            *Key,\r
  IN     UINTN                    TimeoutInSec,\r
  IN     EBL_GET_CHAR_CALL_BACK   CallBack   OPTIONAL\r
  )\r
{\r
  EFI_STATUS    Status;\r
  UINTN         WaitCount;\r
  UINTN         WaitIndex;\r
  EFI_EVENT     WaitList[2];\r
\r
  WaitCount   = 1;\r
  WaitList[0] = gST->ConIn->WaitForKey;\r
  if (TimeoutInSec != 0) {\r
    // Create a time event for 1 sec duration if we have a timeout\r
    gBS->CreateEvent (EVT_TIMER, 0, NULL, NULL, &WaitList[1]);\r
    gBS->SetTimer (WaitList[1], TimerPeriodic, EFI_SET_TIMER_TO_SECOND);\r
    WaitCount++;\r
  }\r
\r
  for (;;) {\r
    Status = gBS->WaitForEvent (WaitCount, WaitList, &WaitIndex);\r
    ASSERT_EFI_ERROR (Status);\r
\r
    switch (WaitIndex) {\r
    case 0:\r
      // Key event signaled\r
      Status = gST->ConIn->ReadKeyStroke (gST->ConIn, Key);\r
      if (!EFI_ERROR (Status)) {\r
        if (WaitCount == 2) {\r
          gBS->CloseEvent (WaitList[1]);\r
        }\r
        return EFI_SUCCESS;\r
      }\r
      break;\r
\r
    case 1:\r
      // Periodic 1 sec timer signaled\r
      TimeoutInSec--;\r
      if (CallBack != NULL) {\r
        // Call the users callback function if registered\r
        CallBack (TimeoutInSec);\r
      }\r
      if (TimeoutInSec == 0) {\r
        gBS->CloseEvent (WaitList[1]);\r
        return EFI_TIMEOUT;\r
      }\r
      break;\r
    default:\r
      ASSERT (FALSE);\r
    }\r
  }\r
}\r
\r
\r
/**\r
  This routine is used prevent command output data from scrolling off the end\r
  of the screen. The global gPageBreak is used to turn on or off this feature.\r
  If the CurrentRow is near the end of the screen pause and print out a prompt\r
  If the use hits Q to quit return TRUE else for any other key return FALSE.\r
  PrefixNewline is used to figure out if a newline is needed before the prompt\r
  string. This depends on the last print done before calling this function.\r
  CurrentRow is updated by one on a call or set back to zero if a prompt is\r
  needed.\r
\r
  @param  CurrentRow  Used to figure out if its the end of the page and updated\r
  @param  PrefixNewline  Did previous print issue a newline\r
\r
  @return TRUE if Q was hit to quit, FALSE in all other cases.\r
\r
**/\r
BOOLEAN\r
EFIAPI\r
EblAnyKeyToContinueQtoQuit (\r
  IN  UINTN   *CurrentRow,\r
  IN  BOOLEAN PrefixNewline\r
  )\r
{\r
  EFI_INPUT_KEY     InputKey;\r
\r
  if (!gPageBreak) {\r
    // global disable for this feature\r
    return FALSE;\r
  }\r
\r
  if (*CurrentRow >= (gScreenRows - 2)) {\r
    if (PrefixNewline) {\r
      AsciiPrint ("\n");\r
    }\r
    AsciiPrint ("Any key to continue (Q to quit): ");\r
    EblGetCharKey (&InputKey, 0, NULL);\r
    AsciiPrint ("\n");\r
\r
    // Time to promt to stop the screen. We have to leave space for the prompt string\r
    *CurrentRow = 0;\r
    if (InputKey.UnicodeChar == 'Q' || InputKey.UnicodeChar == 'q') {\r
      return TRUE;\r
    }\r
  } else {\r
    *CurrentRow += 1;\r
  }\r
\r
  return FALSE;\r
}\r
\r
\r
/**\r
  Set the text color of the EFI Console. If a zero is passed in reset to\r
  default text/background color.\r
\r
  @param  Attribute   For text and background color\r
\r
**/\r
VOID\r
EblSetTextColor (\r
  UINTN   Attribute\r
  )\r
{\r
  if (Attribute == 0) {\r
    // Set the text color back to default\r
    Attribute = (UINTN)PcdGet32 (PcdEmbeddedDefaultTextColor);\r
  }\r
\r
  gST->ConOut->SetAttribute (gST->ConOut, Attribute);\r
}\r
\r
\r
/**\r
  Collect the keyboard input for a cmd line. Carriage Return, New Line, or ESC\r
  terminates the command line. You can edit the command line via left arrow,\r
  delete and backspace and they all back up and erase the command line.\r
  No edit of command line is possible without deletion at this time!\r
  The up arrow and down arrow fill Cmd with information from the history\r
  buffer.\r
\r
  @param  Cmd         Command line to return\r
  @param  CmdMaxSize  Maximum size of Cmd\r
\r
  @return The Status of EblGetCharKey()\r
\r
**/\r
EFI_STATUS\r
GetCmd (\r
  IN OUT  CHAR8   *Cmd,\r
  IN      UINTN   CmdMaxSize\r
  )\r
{\r
  EFI_STATUS    Status;\r
  UINTN         Index;\r
  UINTN         Index2;\r
  CHAR8         Char;\r
  CHAR8         *History;\r
  EFI_INPUT_KEY Key;\r
\r
  for (Index = 0; Index < CmdMaxSize - 1;) {\r
    Status = EblGetCharKey (&Key, 0, NULL);\r
    if (EFI_ERROR (Status)) {\r
      Cmd[Index] = '\0';\r
      AsciiPrint ("\n");\r
      return Status;\r
    }\r
\r
    Char = (CHAR8)Key.UnicodeChar;\r
    if ((Char == '\n') || (Char == '\r') || (Char == 0x7f)) {\r
      Cmd[Index] = '\0';\r
      if (FixedPcdGetBool(PcdEmbeddedShellCharacterEcho) == TRUE) {\r
        AsciiPrint ("\n\r");\r
      }\r
      return EFI_SUCCESS;\r
    } else if ((Char == '\b') || (Key.ScanCode == SCAN_LEFT) || (Key.ScanCode == SCAN_DELETE)){\r
      if (Index != 0) {\r
        Index--;\r
        //\r
        // Update the display\r
        //\r
        AsciiPrint ("\b \b");\r
      }\r
    } else if ((Key.ScanCode == SCAN_UP) || Key.ScanCode == SCAN_DOWN) {\r
      History = GetCmdHistory (Key.ScanCode);\r
      //\r
      // Clear display line\r
      //\r
      for (Index2 = 0; Index2 < Index; Index2++) {\r
        AsciiPrint ("\b \b");\r
      }\r
      AsciiPrint (History);\r
      Index = AsciiStrLen (History);\r
      AsciiStrnCpyS (Cmd, CmdMaxSize, History, CmdMaxSize);\r
    } else {\r
      Cmd[Index++] = Char;\r
      if (FixedPcdGetBool(PcdEmbeddedShellCharacterEcho) == TRUE) {\r
        AsciiPrint ("%c", Char);\r
      }\r
    }\r
  }\r
\r
  return EFI_SUCCESS;\r
}\r
\r
\r
/**\r
  Print the boot up banner for the EBL.\r
**/\r
VOID\r
EblPrintStartupBanner (\r
  VOID\r
  )\r
{\r
  AsciiPrint ("Embedded Boot Loader (");\r
  EblSetTextColor (EFI_YELLOW);\r
  AsciiPrint ("EBL");\r
  EblSetTextColor (0);\r
  AsciiPrint (") prototype. Built at %a on %a\n",__TIME__, __DATE__);\r
  AsciiPrint ("THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN 'AS IS' BASIS,\nWITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\n");\r
  AsciiPrint ("Please send feedback to edk2-devel@lists.sourceforge.net\n");\r
}\r
\r
\r
/**\r
  Send null requests to all removable media block IO devices so the a media add/remove/change\r
  can be detected in real before we execute a command.\r
\r
  This is mainly due to the fact that the FAT driver does not do this today so you can get stale\r
  dir commands after an SD Card has been removed.\r
**/\r
VOID\r
EblProbeRemovableMedia (\r
  VOID\r
  )\r
{\r
  UINTN         Index;\r
  UINTN         Max;\r
  EFI_OPEN_FILE *File;\r
\r
  //\r
  // Probe for media insertion/removal in removable media devices\r
  //\r
  Max = EfiGetDeviceCounts (EfiOpenBlockIo);\r
  if (Max != 0) {\r
    for (Index = 0; Index < Max; Index++) {\r
      File = EfiDeviceOpenByType (EfiOpenBlockIo, Index);\r
      if (File != NULL) {\r
        if (File->FsBlockIoMedia->RemovableMedia) {\r
          // Probe to see if media is present (or not) or media changed\r
          //  this causes the ReinstallProtocolInterface() to fire in the\r
          //  block io driver to update the system about media change events\r
          File->FsBlockIo->ReadBlocks (File->FsBlockIo, File->FsBlockIo->Media->MediaId, (EFI_LBA)0, 0, NULL);\r
        }\r
        EfiClose (File);\r
      }\r
    }\r
  }\r
}\r
\r
\r
\r
\r
/**\r
  Print the prompt for the EBL.\r
**/\r
VOID\r
EblPrompt (\r
  VOID\r
  )\r
{\r
  EblSetTextColor (EFI_YELLOW);\r
  AsciiPrint ("%a %a",(CHAR8 *)PcdGetPtr (PcdEmbeddedPrompt), EfiGetCwd ());\r
  EblSetTextColor (0);\r
  AsciiPrint ("%a", ">");\r
}\r
\r
\r
\r
/**\r
  Parse a command line and execute the commands. The ; separator allows\r
  multiple commands for each command line. Stop processing if one of the\r
  commands returns an error.\r
\r
  @param  CmdLine          Command Line to process.\r
  @param  MaxCmdLineSize   MaxSize of the Command line\r
\r
  @return EFI status of the Command\r
\r
**/\r
EFI_STATUS\r
ProcessCmdLine (\r
  IN CHAR8      *CmdLine,\r
  IN UINTN      MaxCmdLineSize\r
  )\r
{\r
  EFI_STATUS          Status;\r
  EBL_COMMAND_TABLE   *Cmd;\r
  CHAR8               *Ptr;\r
  UINTN               Argc;\r
  CHAR8               *Argv[MAX_ARGS];\r
\r
  // Parse the command line. The loop processes commands separated by ;\r
  for (Ptr = CmdLine, Status = EFI_SUCCESS; Ptr != NULL;) {\r
    Ptr = ParseArguments (Ptr, &Argc, Argv);\r
    if (Argc != 0) {\r
      Cmd = EblGetCommand (Argv[0]);\r
      if (Cmd != NULL) {\r
        // Execute the Command!\r
        Status = Cmd->Command (Argc, Argv);\r
        if (Status == EFI_ABORTED) {\r
          // exit command so lets exit\r
          break;\r
        } else if (Status == EFI_TIMEOUT) {\r
          // pause command got input so don't process any more cmd on this cmd line\r
          break;\r
        } else if (EFI_ERROR (Status)) {\r
          AsciiPrint ("%a returned %r error\n", Cmd->Name, Status);\r
          // if any command fails stop processing CmdLine\r
          break;\r
        }\r
      } else {\r
        AsciiPrint ("The command '%a' is not supported.\n", Argv[0]);\r
      }\r
    }\r
  }\r
\r
  return Status;\r
}\r
\r
\r
\r
/**\r
  Embedded Boot Loader (EBL) - A simple EFI command line application for embedded\r
  devices. PcdEmbeddedAutomaticBootCommand is a complied in command line that\r
  gets executed automatically. The ; separator allows multiple commands\r
  for each command line.\r
\r
  @param  ImageHandle   EFI ImageHandle for this application.\r
  @param  SystemTable   EFI system table\r
\r
  @return EFI status of the application\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
EdkBootLoaderEntry (\r
  IN EFI_HANDLE                            ImageHandle,\r
  IN EFI_SYSTEM_TABLE                      *SystemTable\r
  )\r
{\r
  EFI_STATUS  Status;\r
  CHAR8       CmdLine[MAX_CMD_LINE];\r
  CHAR16      *CommandLineVariable = NULL;\r
  CHAR16      *CommandLineVariableName = L"default-cmdline";\r
  UINTN       CommandLineVariableSize = 0;\r
  EFI_GUID    VendorGuid;\r
\r
  // Initialize tables of commands\r
  EblInitializeCmdTable ();\r
  EblInitializeDeviceCmd ();\r
  EblInitializemdHwDebugCmds ();\r
  EblInitializemdHwIoDebugCmds ();\r
  EblInitializeDirCmd ();\r
  EblInitializeHobCmd ();\r
  EblInitializeScriptCmd ();\r
  EblInitializeExternalCmd ();\r
  EblInitializeNetworkCmd();\r
  EblInitializeVariableCmds ();\r
\r
  if (gST->ConOut == NULL) {\r
    DEBUG((EFI_D_ERROR,"Error: No Console Output\n"));\r
    return EFI_NOT_READY;\r
  }\r
\r
  // Disable the 5 minute EFI watchdog time so we don't get automatically reset\r
  gBS->SetWatchdogTimer (0, 0, 0, NULL);\r
\r
  if (FeaturePcdGet (PcdEmbeddedMacBoot)) {\r
    // A MAC will boot in graphics mode, so turn it back to text here\r
    // This protocol was removed from edk2. It is only an edk thing. We need to make our own copy.\r
    // DisableQuietBoot ();\r
\r
    // Enable the biggest output screen size possible\r
    gST->ConOut->SetMode (gST->ConOut, (UINTN)gST->ConOut->Mode->MaxMode - 1);\r
\r
  }\r
\r
  // Save current screen mode\r
  gST->ConOut->QueryMode (gST->ConOut, gST->ConOut->Mode->Mode, &gScreenColumns, &gScreenRows);\r
\r
  EblPrintStartupBanner ();\r
\r
  // Parse command line and handle commands separated by ;\r
  // The loop prints the prompt gets user input and saves history\r
\r
  // Look for a variable with a default command line, otherwise use the Pcd\r
  ZeroMem(&VendorGuid, sizeof(EFI_GUID));\r
\r
  Status = gRT->GetVariable(CommandLineVariableName, &VendorGuid, NULL, &CommandLineVariableSize, CommandLineVariable);\r
  if (Status == EFI_BUFFER_TOO_SMALL) {\r
    CommandLineVariable = AllocatePool(CommandLineVariableSize);\r
\r
    Status = gRT->GetVariable(CommandLineVariableName, &VendorGuid, NULL, &CommandLineVariableSize, CommandLineVariable);\r
    if (!EFI_ERROR(Status)) {\r
      UnicodeStrToAsciiStrS (CommandLineVariable, CmdLine, MAX_CMD_LINE);\r
    }\r
\r
    FreePool(CommandLineVariable);\r
  }\r
\r
  if (EFI_ERROR(Status)) {\r
    AsciiStrCpyS (CmdLine, MAX_CMD_LINE, (CHAR8 *)PcdGetPtr (PcdEmbeddedAutomaticBootCommand));\r
  }\r
\r
  for (;;) {\r
    Status = ProcessCmdLine (CmdLine, MAX_CMD_LINE);\r
    if (Status == EFI_ABORTED) {\r
      // if a command returns EFI_ABORTED then exit the EBL\r
      EblShutdownExternalCmdTable ();\r
      return EFI_SUCCESS;\r
    }\r
\r
    // get the command line from the user\r
    EblPrompt ();\r
    GetCmd (CmdLine, MAX_CMD_LINE);\r
    SetCmdHistory (CmdLine);\r
\r
    if (FeaturePcdGet (PcdEmbeddedProbeRemovable)) {\r
      // Probe removable media devices to see if media has been inserted or removed.\r
      EblProbeRemovableMedia ();\r
    }\r
  }\r
}\r
\r
\r