audk/OvmfPkg/PlatformDxe/Platform.c

/** @file
  This driver effectuates OVMF's platform configuration settings and exposes
  them via HII.

  Copyright (C) 2014, Red Hat, Inc.
  Copyright (c) 2009 - 2011, Intel Corporation. All rights reserved.<BR>

  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 <Library/DebugLib.h>
#include <Library/DevicePathLib.h>
#include <Library/HiiLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Protocol/DevicePath.h>
#include <Protocol/HiiConfigAccess.h>

#include "PlatformConfig.h"

//
// The HiiAddPackages() library function requires that any controller (or
// image) handle, to be associated with the HII packages under installation, be
// "decorated" with a device path. The tradition seems to be a vendor device
// path.
//
// We'd like to associate our HII packages with the driver's image handle. The
// first idea is to use the driver image's device path. Unfortunately, loaded
// images only come with an EFI_LOADED_IMAGE_DEVICE_PATH_PROTOCOL (not the
// usual EFI_DEVICE_PATH_PROTOCOL), ie. a different GUID. In addition, even the
// EFI_LOADED_IMAGE_DEVICE_PATH_PROTOCOL interface may be NULL, if the image
// has been loaded from an "unnamed" memory source buffer.
//
// Hence let's just stick with the tradition -- use a dedicated vendor device
// path, with the driver's FILE_GUID.
//
#pragma pack(1)
typedef struct {
  VENDOR_DEVICE_PATH       VendorDevicePath;
  EFI_DEVICE_PATH_PROTOCOL End;
} PKG_DEVICE_PATH;
#pragma pack()

STATIC PKG_DEVICE_PATH mPkgDevicePath = {
  {
    {
      HARDWARE_DEVICE_PATH,
      HW_VENDOR_DP,
      {
        (UINT8) (sizeof (VENDOR_DEVICE_PATH)     ),
        (UINT8) (sizeof (VENDOR_DEVICE_PATH) >> 8)
      }
    },
    EFI_CALLER_ID_GUID
  },
  {
    END_DEVICE_PATH_TYPE,
    END_ENTIRE_DEVICE_PATH_SUBTYPE,
    {
      (UINT8) (END_DEVICE_PATH_LENGTH     ),
      (UINT8) (END_DEVICE_PATH_LENGTH >> 8)
    }
  }
};

//
// The configuration interface between the HII engine (form display etc) and
// this driver.
//
STATIC EFI_HII_CONFIG_ACCESS_PROTOCOL mConfigAccess;

//
// The handle representing our list of packages after installation.
//
STATIC EFI_HII_HANDLE mInstalledPackages;

//
// The arrays below constitute our HII package list. They are auto-generated by
// the VFR compiler and linked into the driver image during the build.
//
// - The strings package receives its C identifier from the driver's BASE_NAME,
//   plus "Strings".
//
// - The forms package receives its C identifier from the VFR file's basename,
//   plus "Bin".
//
//
extern UINT8 PlatformDxeStrings[];
extern UINT8 PlatformFormsBin[];


STATIC
EFI_STATUS
EFIAPI
ExtractConfig (
  IN CONST  EFI_HII_CONFIG_ACCESS_PROTOCOL  *This,
  IN CONST  EFI_STRING                      Request,
  OUT       EFI_STRING                      *Progress,
  OUT       EFI_STRING                      *Results
)
{
  return EFI_SUCCESS;
}


STATIC
EFI_STATUS
EFIAPI
RouteConfig (
  IN CONST  EFI_HII_CONFIG_ACCESS_PROTOCOL  *This,
  IN CONST  EFI_STRING                      Configuration,
  OUT       EFI_STRING                      *Progress
)
{
  return EFI_SUCCESS;
}


STATIC
EFI_STATUS
EFIAPI
Callback (
  IN     CONST EFI_HII_CONFIG_ACCESS_PROTOCOL   *This,
  IN     EFI_BROWSER_ACTION                     Action,
  IN     EFI_QUESTION_ID                        QuestionId,
  IN     UINT8                                  Type,
  IN OUT EFI_IFR_TYPE_VALUE                     *Value,
  OUT    EFI_BROWSER_ACTION_REQUEST             *ActionRequest
  )
{
  return EFI_SUCCESS;
}


/**
  Load and execute the platform configuration.

  @retval EFI_SUCCESS            Configuration loaded and executed.
  @return                        Status codes from PlatformConfigLoad().
**/
STATIC
EFI_STATUS
EFIAPI
ExecutePlatformConfig (
  VOID
  )
{
  EFI_STATUS      Status;
  PLATFORM_CONFIG PlatformConfig;
  UINT64          OptionalElements;

  Status = PlatformConfigLoad (&PlatformConfig, &OptionalElements);
  if (EFI_ERROR (Status)) {
    DEBUG (((Status == EFI_NOT_FOUND) ? EFI_D_VERBOSE : EFI_D_ERROR,
      "%a: failed to load platform config: %r\n", __FUNCTION__, Status));
    return Status;
  }

  if (OptionalElements & PLATFORM_CONFIG_F_GRAPHICS_RESOLUTION) {
    //
    // Pass the preferred resolution to GraphicsConsoleDxe via dynamic PCDs.
    //
    PcdSet32 (PcdVideoHorizontalResolution,
      PlatformConfig.HorizontalResolution);
    PcdSet32 (PcdVideoVerticalResolution,
      PlatformConfig.VerticalResolution);
  }

  return EFI_SUCCESS;
}


/**
  Entry point for this driver.

  @param[in] ImageHandle  Image handle of this driver.
  @param[in] SystemTable  Pointer to SystemTable.

  @retval EFI_SUCESS            Driver has loaded successfully.
  @retval EFI_OUT_OF_RESOURCES  Failed to install HII packages.
  @return                       Error codes from lower level functions.

**/
EFI_STATUS
EFIAPI
PlatformInit (
  IN  EFI_HANDLE        ImageHandle,
  IN  EFI_SYSTEM_TABLE  *SystemTable
  )
{
  EFI_STATUS Status;

  ExecutePlatformConfig ();

  mConfigAccess.ExtractConfig = &ExtractConfig;
  mConfigAccess.RouteConfig   = &RouteConfig;
  mConfigAccess.Callback      = &Callback;

  //
  // Declare ourselves suitable for HII communication.
  //
  Status = gBS->InstallMultipleProtocolInterfaces (&ImageHandle,
                  &gEfiDevicePathProtocolGuid,      &mPkgDevicePath,
                  &gEfiHiiConfigAccessProtocolGuid, &mConfigAccess,
                  NULL);
  if (EFI_ERROR (Status)) {
    return Status;
  }

  //
  // Publish the HII package list to HII Database.
  //
  mInstalledPackages = HiiAddPackages (
                         &gEfiCallerIdGuid,  // PackageListGuid
                         ImageHandle,        // associated DeviceHandle
                         PlatformDxeStrings, // 1st package
                         PlatformFormsBin,   // 2nd package
                         NULL                // terminator
                         );
  if (mInstalledPackages == NULL) {
    Status = EFI_OUT_OF_RESOURCES;
    goto UninstallProtocols;
  }

  return EFI_SUCCESS;

UninstallProtocols:
  gBS->UninstallMultipleProtocolInterfaces (ImageHandle,
         &gEfiDevicePathProtocolGuid,      &mPkgDevicePath,
         &gEfiHiiConfigAccessProtocolGuid, &mConfigAccess,
         NULL);
  return Status;
}

/**
  Unload the driver.

  @param[in]  ImageHandle  Handle that identifies the image to evict.

  @retval EFI_SUCCESS  The image has been unloaded.
**/
EFI_STATUS
EFIAPI
PlatformUnload (
  IN  EFI_HANDLE  ImageHandle
  )
{
  HiiRemovePackages (mInstalledPackages);
  gBS->UninstallMultipleProtocolInterfaces (ImageHandle,
         &gEfiDevicePathProtocolGuid,      &mPkgDevicePath,
         &gEfiHiiConfigAccessProtocolGuid, &mConfigAccess,
         NULL);
  return EFI_SUCCESS;
}