audk/MdeModulePkg/Library/GenericBdsLib/BdsConsole.c

/** @file
  BDS Lib functions which contain all the code to connect console device

Copyright (c) 2004 - 2008, Intel Corporation. <BR>
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution.  The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php

THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#include "InternalBdsLib.h"

/**
  Check if we need to save the EFI variable with "ConVarName" as name
  as NV type

  @param ConVarName The name of the EFI variable.

  @retval TRUE    Set the EFI variabel as NV type.
  @retval FALSE   EFI variabel as NV type can be set NonNV.
**/
BOOLEAN
IsNvNeed (
  IN CHAR16 *ConVarName
  )
{
  CHAR16 *Ptr;

  Ptr = ConVarName;

  //
  // If the variable includes "Dev" at last, we consider
  // it does not support NV attribute.
  //
  while (*Ptr != L'\0') {
    Ptr++;
  }

  if ((*(Ptr - 3) == 'D') && (*(Ptr - 2) == 'e') && (*(Ptr - 1) == 'v')) {
    return FALSE;
  } else {
    return TRUE;
  }
}


/**
  This function update console variable based on ConVarName, it can
  add or remove one specific console device path from the variable

  @param  ConVarName               Console related variable name, ConIn, ConOut,
                                   ErrOut.
  @param  CustomizedConDevicePath  The console device path which will be added to
                                   the console variable ConVarName, this parameter
                                   can not be multi-instance.
  @param  ExclusiveDevicePath      The console device path which will be removed
                                   from the console variable ConVarName, this
                                   parameter can not be multi-instance.

  @retval EFI_UNSUPPORTED          Add or remove the same device path.
  @retval EFI_SUCCESS              Success add or remove the device path from  the
                                   console variable.

**/
EFI_STATUS
EFIAPI
BdsLibUpdateConsoleVariable (
  IN  CHAR16                    *ConVarName,
  IN  EFI_DEVICE_PATH_PROTOCOL  *CustomizedConDevicePath,
  IN  EFI_DEVICE_PATH_PROTOCOL  *ExclusiveDevicePath
  )
{
  EFI_DEVICE_PATH_PROTOCOL  *VarConsole;
  UINTN                     DevicePathSize;
  EFI_DEVICE_PATH_PROTOCOL  *NewDevicePath;
  EFI_DEVICE_PATH_PROTOCOL  *TempNewDevicePath;
  UINT32                    Attributes;

  VarConsole      = NULL;
  DevicePathSize  = 0;

  //
  // Notes: check the device path point, here should check
  // with compare memory
  //
  if (CustomizedConDevicePath == ExclusiveDevicePath) {
    return EFI_UNSUPPORTED;
  }
  //
  // Delete the ExclusiveDevicePath from current default console
  //
  VarConsole = BdsLibGetVariableAndSize (
                ConVarName,
                &gEfiGlobalVariableGuid,
                &DevicePathSize
                );

  //
  // Initialize NewDevicePath
  //
  NewDevicePath  = VarConsole;

  //
  // If ExclusiveDevicePath is even the part of the instance in VarConsole, delete it.
  // In the end, NewDevicePath is the final device path.
  //
  if (ExclusiveDevicePath != NULL && VarConsole != NULL) {
      NewDevicePath = BdsLibDelPartMatchInstance (VarConsole, ExclusiveDevicePath);
  }
  //
  // Try to append customized device path to NewDevicePath.
  //
  if (CustomizedConDevicePath != NULL) {
    if (!BdsLibMatchDevicePaths (NewDevicePath, CustomizedConDevicePath)) {
      //
      // Check if there is part of CustomizedConDevicePath in NewDevicePath, delete it.
      //
      NewDevicePath = BdsLibDelPartMatchInstance (NewDevicePath, CustomizedConDevicePath);
      //
      // In the first check, the default console variable will be _ModuleEntryPoint,
      // just append current customized device path
      //
      TempNewDevicePath = NewDevicePath;
      NewDevicePath = AppendDevicePathInstance (NewDevicePath, CustomizedConDevicePath);
      SafeFreePool(TempNewDevicePath);
    }
  }

  //
  // The attribute for ConInDev, ConOutDev and ErrOutDev does not include NV.
  //
  if (IsNvNeed(ConVarName)) {
    //
    // ConVarName has NV attribute.
    //
    Attributes = EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_NON_VOLATILE;
  } else {
    //
    // ConVarName does not have NV attribute.
    //
    Attributes = EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS;
  }

  //
  // Finally, Update the variable of the default console by NewDevicePath
  //
  gRT->SetVariable (
        ConVarName,
        &gEfiGlobalVariableGuid,
        Attributes,
        GetDevicePathSize (NewDevicePath),
        NewDevicePath
        );

  if (VarConsole == NewDevicePath) {
    SafeFreePool(VarConsole);
  } else {
    SafeFreePool(VarConsole);
    SafeFreePool(NewDevicePath);
  }

  return EFI_SUCCESS;

}


/**
  Connect the console device base on the variable ConVarName, if
  device path of the ConVarName is multi-instance device path, if
  anyone of the instances is connected success, then this function
  will return success.

  @param  ConVarName               Console related variable name, ConIn, ConOut,
                                   ErrOut.

  @retval EFI_NOT_FOUND            There is not any console devices connected
                                   success
  @retval EFI_SUCCESS              Success connect any one instance of the console
                                   device path base on the variable ConVarName.

**/
EFI_STATUS
EFIAPI
BdsLibConnectConsoleVariable (
  IN  CHAR16                 *ConVarName
  )
{
  EFI_STATUS                Status;
  EFI_DEVICE_PATH_PROTOCOL  *StartDevicePath;
  UINTN                     VariableSize;
  EFI_DEVICE_PATH_PROTOCOL  *Instance;
  EFI_DEVICE_PATH_PROTOCOL  *Next;
  EFI_DEVICE_PATH_PROTOCOL  *CopyOfDevicePath;
  UINTN                     Size;
  BOOLEAN                   DeviceExist;

  Status      = EFI_SUCCESS;
  DeviceExist = FALSE;

  //
  // Check if the console variable exist
  //
  StartDevicePath = BdsLibGetVariableAndSize (
                      ConVarName,
                      &gEfiGlobalVariableGuid,
                      &VariableSize
                      );
  if (StartDevicePath == NULL) {
    return EFI_UNSUPPORTED;
  }

  CopyOfDevicePath = StartDevicePath;
  do {
    //
    // Check every instance of the console variable
    //
    Instance  = GetNextDevicePathInstance (&CopyOfDevicePath, &Size);
    Next      = Instance;
    while (!IsDevicePathEndType (Next)) {
      Next = NextDevicePathNode (Next);
    }

    SetDevicePathEndNode (Next);
    //
    // Check USB1.1 console
    //
    if ((DevicePathType (Instance) == MESSAGING_DEVICE_PATH) &&
       ((DevicePathSubType (Instance) == MSG_USB_CLASS_DP)
       || (DevicePathSubType (Instance) == MSG_USB_WWID_DP)
       )) {
      //
      // Check the Usb console in Usb2.0 bus firstly, then Usb1.1 bus
      //
      Status = BdsLibConnectUsbDevByShortFormDP (PCI_CLASSC_PI_EHCI, Instance);
      if (!EFI_ERROR (Status)) {
        DeviceExist = TRUE;
      }

      Status = BdsLibConnectUsbDevByShortFormDP (PCI_CLASSC_PI_UHCI, Instance);
      if (!EFI_ERROR (Status)) {
        DeviceExist = TRUE;
      }
    } else {
      //
      // Connect the instance device path
      //
      Status = BdsLibConnectDevicePath (Instance);
      if (EFI_ERROR (Status)) {
        //
        // Delete the instance from the console varialbe
        //
        BdsLibUpdateConsoleVariable (ConVarName, NULL, Instance);
      } else {
        DeviceExist = TRUE;
      }
    }
    SafeFreePool(Instance);
  } while (CopyOfDevicePath != NULL);

  SafeFreePool (StartDevicePath);

  if (!DeviceExist) {
    return EFI_NOT_FOUND;
  }

  return EFI_SUCCESS;
}


/**
  This function will search every simpletxt devive in current system,
  and make every simpletxt device as pertantial console device.

**/
VOID
EFIAPI
BdsLibConnectAllConsoles (
  VOID
  )
{
  UINTN                     Index;
  EFI_DEVICE_PATH_PROTOCOL  *ConDevicePath;
  UINTN                     HandleCount;
  EFI_HANDLE                *HandleBuffer;

  Index         = 0;
  HandleCount   = 0;
  HandleBuffer  = NULL;
  ConDevicePath = NULL;

  //
  // Update all the console varables
  //
  gBS->LocateHandleBuffer (
          ByProtocol,
          &gEfiSimpleTextInProtocolGuid,
          NULL,
          &HandleCount,
          &HandleBuffer
          );
  
  for (Index = 0; Index < HandleCount; Index++) {
    gBS->HandleProtocol (
            HandleBuffer[Index],
            &gEfiDevicePathProtocolGuid,
            (VOID **) &ConDevicePath
            );
    BdsLibUpdateConsoleVariable (L"ConIn", ConDevicePath, NULL);
  }

  SafeFreePool(HandleBuffer);

  gBS->LocateHandleBuffer (
          ByProtocol,
          &gEfiSimpleTextOutProtocolGuid,
          NULL,
          &HandleCount,
          &HandleBuffer
          );
  for (Index = 0; Index < HandleCount; Index++) {
    gBS->HandleProtocol (
            HandleBuffer[Index],
            &gEfiDevicePathProtocolGuid,
            (VOID **) &ConDevicePath
            );
    BdsLibUpdateConsoleVariable (L"ConOut", ConDevicePath, NULL);
    BdsLibUpdateConsoleVariable (L"ErrOut", ConDevicePath, NULL);
  }

  SafeFreePool(HandleBuffer);

  //
  // Connect all console variables
  //
  BdsLibConnectAllDefaultConsoles ();

}

/**
  This function will connect console device base on the console
  device variable ConIn, ConOut and ErrOut.

  @retval EFI_SUCCESS              At least one of the ConIn and ConOut device have
                                   been connected success.
  @retval EFI_STATUS               Return the status of
                                   BdsLibConnectConsoleVariable ().

**/
EFI_STATUS
EFIAPI
BdsLibConnectAllDefaultConsoles (
  VOID
  )
{
  EFI_STATUS                Status;

  //
  // Connect all default console variables
  //

  //
  // It seems impossible not to have any ConOut device on platform,
  // so we check the status here.
  //
  Status = BdsLibConnectConsoleVariable (L"ConOut");
  if (EFI_ERROR (Status)) {
    return Status;
  }

  //
  // Insert the performance probe for Console Out
  //
  PERF_START (NULL, "ConOut", "BDS", 1);
  PERF_END (NULL, "ConOut", "BDS", 0);

  //
  // Because possibly the platform is legacy free, in such case,
  // ConIn devices (Serial Port and PS2 Keyboard ) does not exist,
  // so we need not check the status.
  //
  BdsLibConnectConsoleVariable (L"ConIn");

  //
  // The _ModuleEntryPoint err out var is legal.
  //
  BdsLibConnectConsoleVariable (L"ErrOut");

  return EFI_SUCCESS;

}