Fv.c

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#include "PiPei.h"
#include "Platform.h"
#include <Library/DebugLib.h>
#include <Library/HobLib.h>
#include <Library/PeiServicesLib.h>
#include <Library/PcdLib.h>
 
EFI_STATUS
PeiFvInitialization (
  IN EFI_HOB_PLATFORM_INFO  *PlatformInfoHob
  )
{
  BOOLEAN  SecureS3Needed;
 
  DEBUG ((DEBUG_INFO, "Platform PEI Firmware Volume Initialization\n"));
 
  //
  // Create a memory allocation HOB for the PEI FV.
  //
  // Allocate as ACPI NVS is S3 is supported
  //
  BuildMemoryAllocationHob (
    PcdGet32 (PcdOvmfPeiMemFvBase),
    PcdGet32 (PcdOvmfPeiMemFvSize),
    PlatformInfoHob->S3Supported ? EfiACPIMemoryNVS : EfiBootServicesData
    );
 
  //
  // Let DXE know about the DXE FV
  //
  BuildFvHob (PcdGet32 (PcdOvmfDxeMemFvBase), PcdGet32 (PcdOvmfDxeMemFvSize));
 
  SecureS3Needed = PlatformInfoHob->S3Supported && PlatformInfoHob->SmmSmramRequire;
 
  //
  // Create a memory allocation HOB for the DXE FV.
  //
  // If "secure" S3 is needed, then SEC will decompress both PEI and DXE
  // firmware volumes at S3 resume too, hence we need to keep away the OS from
  // DXEFV as well. Otherwise we only need to keep away DXE itself from the
  // DXEFV area.
  //
  BuildMemoryAllocationHob (
    PcdGet32 (PcdOvmfDxeMemFvBase),
    PcdGet32 (PcdOvmfDxeMemFvSize),
    SecureS3Needed ? EfiACPIMemoryNVS : EfiBootServicesData
    );
 
  //
  // Additionally, said decompression will use temporary memory above the end
  // of DXEFV, so let's keep away the OS from there too.
  //
  if (SecureS3Needed) {
    UINT32  DxeMemFvEnd;
 
    DxeMemFvEnd = PcdGet32 (PcdOvmfDxeMemFvBase) +
                  PcdGet32 (PcdOvmfDxeMemFvSize);
    BuildMemoryAllocationHob (
      DxeMemFvEnd,
      PcdGet32 (PcdOvmfDecompressionScratchEnd) - DxeMemFvEnd,
      EfiACPIMemoryNVS
      );
  }
 
  //
  // Let PEI know about the DXE FV so it can find the DXE Core
  //
  PeiServicesInstallFvInfoPpi (
    NULL,
    (VOID *)(UINTN)PcdGet32 (PcdOvmfDxeMemFvBase),
    PcdGet32 (PcdOvmfDxeMemFvSize),
    NULL,
    NULL
    );
 
  return EFI_SUCCESS;
}