OvmfPkg/QemuFlashFvbServicesRuntimeDxe/FwBlockServiceDxe.c

   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 }