OvmfPkg: Apply uncrustify changes

[mirror_edk2.git] / OvmfPkg / QemuFlashFvbServicesRuntimeDxe / QemuFlashDxe.c

/** @file\r
  OVMF support for QEMU system firmware flash device: functions specific to the\r
  runtime DXE driver build.\r
\r
  Copyright (C) 2015, Red Hat, Inc.\r
  Copyright (c) 2009 - 2013, Intel Corporation. All rights reserved.<BR>\r
\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include <Library/UefiRuntimeLib.h>\r
#include <Library/MemEncryptSevLib.h>\r
#include <Library/VmgExitLib.h>\r
#include <Register/Amd/Msr.h>\r
\r
#include "QemuFlash.h"\r
\r
STATIC EFI_PHYSICAL_ADDRESS  mSevEsFlashPhysBase;\r
\r
VOID\r
QemuFlashConvertPointers (\r
  VOID\r
  )\r
{\r
  if (MemEncryptSevEsIsEnabled ()) {\r
    mSevEsFlashPhysBase = (UINTN)mFlashBase;\r
  }\r
\r
  EfiConvertPointer (0x0, (VOID **)&mFlashBase);\r
}\r
\r
VOID\r
QemuFlashBeforeProbe (\r
  IN  EFI_PHYSICAL_ADDRESS  BaseAddress,\r
  IN  UINTN                 FdBlockSize,\r
  IN  UINTN                 FdBlockCount\r
  )\r
{\r
  //\r
  // Do nothing\r
  //\r
}\r
\r
/**\r
  Write to QEMU Flash\r
\r
  @param[in] Ptr    Pointer to the location to write.\r
  @param[in] Value  The value to write.\r
\r
**/\r
VOID\r
QemuFlashPtrWrite (\r
  IN        volatile UINT8  *Ptr,\r
  IN        UINT8           Value\r
  )\r
{\r
  if (MemEncryptSevEsIsEnabled ()) {\r
    MSR_SEV_ES_GHCB_REGISTER  Msr;\r
    GHCB                      *Ghcb;\r
    EFI_PHYSICAL_ADDRESS      PhysAddr;\r
    BOOLEAN                   InterruptState;\r
\r
    Msr.GhcbPhysicalAddress = AsmReadMsr64 (MSR_SEV_ES_GHCB);\r
    Ghcb                    = Msr.Ghcb;\r
\r
    //\r
    // The MMIO write needs to be to the physical address of the flash pointer.\r
    // Since this service is available as part of the EFI runtime services,\r
    // account for a non-identity mapped VA after SetVirtualAddressMap().\r
    //\r
    if (mSevEsFlashPhysBase == 0) {\r
      PhysAddr = (UINTN)Ptr;\r
    } else {\r
      PhysAddr = mSevEsFlashPhysBase + (Ptr - mFlashBase);\r
    }\r
\r
    //\r
    // Writing to flash is emulated by the hypervisor through the use of write\r
    // protection. This won't work for an SEV-ES guest because the write won't\r
    // be recognized as a true MMIO write, which would result in the required\r
    // #VC exception. Instead, use the the VMGEXIT MMIO write support directly\r
    // to perform the update.\r
    //\r
    VmgInit (Ghcb, &InterruptState);\r
    Ghcb->SharedBuffer[0]    = Value;\r
    Ghcb->SaveArea.SwScratch = (UINT64)(UINTN)Ghcb->SharedBuffer;\r
    VmgSetOffsetValid (Ghcb, GhcbSwScratch);\r
    VmgExit (Ghcb, SVM_EXIT_MMIO_WRITE, PhysAddr, 1);\r
    VmgDone (Ghcb, InterruptState);\r
  } else {\r
    *Ptr = Value;\r
  }\r
}\r