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      1 /**@file
      2   Functions related to the Firmware Volume Block service whose
      3   implementation is specific to the runtime DXE driver build.
      4 
      5   Copyright (C) 2015, Red Hat, Inc.
      6   Copyright (c) 2006 - 2014, Intel Corporation. All rights reserved.<BR>
      7 
      8   This program and the accompanying materials are licensed and made available
      9   under the terms and conditions of the BSD License which accompanies this
     10   distribution.  The full text of the license may be found at
     11   http://opensource.org/licenses/bsd-license.php
     12 
     13   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
     14   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
     15 **/
     16 
     17 #include <Guid/EventGroup.h>
     18 #include <Library/DebugLib.h>
     19 #include <Library/DevicePathLib.h>
     20 #include <Library/PcdLib.h>
     21 #include <Library/UefiBootServicesTableLib.h>
     22 #include <Library/UefiRuntimeLib.h>
     23 #include <Protocol/DevicePath.h>
     24 #include <Protocol/FirmwareVolumeBlock.h>
     25 
     26 #include "FwBlockService.h"
     27 #include "QemuFlash.h"
     28 
     29 VOID
     30 InstallProtocolInterfaces (
     31   IN EFI_FW_VOL_BLOCK_DEVICE *FvbDevice
     32   )
     33 {
     34   EFI_STATUS                         Status;
     35   EFI_HANDLE                         FwbHandle;
     36   EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *OldFwbInterface;
     37 
     38   ASSERT (!FeaturePcdGet (PcdSmmSmramRequire));
     39 
     40   //
     41   // Find a handle with a matching device path that has supports FW Block
     42   // protocol
     43   //
     44   Status = gBS->LocateDevicePath (&gEfiFirmwareVolumeBlockProtocolGuid,
     45                   &FvbDevice->DevicePath, &FwbHandle);
     46   if (EFI_ERROR (Status)) {
     47     //
     48     // LocateDevicePath fails so install a new interface and device path
     49     //
     50     FwbHandle = NULL;
     51     DEBUG ((EFI_D_INFO, "Installing QEMU flash FVB\n"));
     52     Status = gBS->InstallMultipleProtocolInterfaces (
     53                     &FwbHandle,
     54                     &gEfiFirmwareVolumeBlockProtocolGuid,
     55                     &FvbDevice->FwVolBlockInstance,
     56                     &gEfiDevicePathProtocolGuid,
     57                     FvbDevice->DevicePath,
     58                     NULL
     59                     );
     60     ASSERT_EFI_ERROR (Status);
     61   } else if (IsDevicePathEnd (FvbDevice->DevicePath)) {
     62     //
     63     // Device already exists, so reinstall the FVB protocol
     64     //
     65     Status = gBS->HandleProtocol (
     66                     FwbHandle,
     67                     &gEfiFirmwareVolumeBlockProtocolGuid,
     68                     (VOID**)&OldFwbInterface
     69                     );
     70     ASSERT_EFI_ERROR (Status);
     71 
     72     DEBUG ((EFI_D_INFO, "Reinstalling FVB for QEMU flash region\n"));
     73     Status = gBS->ReinstallProtocolInterface (
     74                     FwbHandle,
     75                     &gEfiFirmwareVolumeBlockProtocolGuid,
     76                     OldFwbInterface,
     77                     &FvbDevice->FwVolBlockInstance
     78                     );
     79     ASSERT_EFI_ERROR (Status);
     80   } else {
     81     //
     82     // There was a FVB protocol on an End Device Path node
     83     //
     84     ASSERT (FALSE);
     85   }
     86 }
     87 
     88 
     89 STATIC
     90 VOID
     91 EFIAPI
     92 FvbVirtualAddressChangeEvent (
     93   IN EFI_EVENT        Event,
     94   IN VOID             *Context
     95   )
     96 /*++
     97 
     98   Routine Description:
     99 
    100     Fixup internal data so that EFI and SAL can be call in virtual mode.
    101     Call the passed in Child Notify event and convert the mFvbModuleGlobal
    102     date items to there virtual address.
    103 
    104   Arguments:
    105 
    106     (Standard EFI notify event - EFI_EVENT_NOTIFY)
    107 
    108   Returns:
    109 
    110     None
    111 
    112 --*/
    113 {
    114   EFI_FW_VOL_INSTANCE *FwhInstance;
    115   UINTN               Index;
    116 
    117   FwhInstance = mFvbModuleGlobal->FvInstance;
    118   EfiConvertPointer (0x0, (VOID **) &mFvbModuleGlobal->FvInstance);
    119 
    120   //
    121   // Convert the base address of all the instances
    122   //
    123   Index       = 0;
    124   while (Index < mFvbModuleGlobal->NumFv) {
    125     EfiConvertPointer (0x0, (VOID **) &FwhInstance->FvBase);
    126     FwhInstance = (EFI_FW_VOL_INSTANCE *)
    127       (
    128         (UINTN) ((UINT8 *) FwhInstance) +
    129         FwhInstance->VolumeHeader.HeaderLength +
    130         (sizeof (EFI_FW_VOL_INSTANCE) - sizeof (EFI_FIRMWARE_VOLUME_HEADER))
    131       );
    132     Index++;
    133   }
    134 
    135   EfiConvertPointer (0x0, (VOID **) &mFvbModuleGlobal);
    136   QemuFlashConvertPointers ();
    137 }
    138 
    139 
    140 VOID
    141 InstallVirtualAddressChangeHandler (
    142   VOID
    143   )
    144 {
    145   EFI_STATUS Status;
    146   EFI_EVENT  VirtualAddressChangeEvent;
    147 
    148   Status = gBS->CreateEventEx (
    149                   EVT_NOTIFY_SIGNAL,
    150                   TPL_NOTIFY,
    151                   FvbVirtualAddressChangeEvent,
    152                   NULL,
    153                   &gEfiEventVirtualAddressChangeGuid,
    154                   &VirtualAddressChangeEvent
    155                   );
    156   ASSERT_EFI_ERROR (Status);
    157 }
    158