SecMemEncryptSevLibInternal.c

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#include <Library/BaseLib.h>
#include <Library/DebugLib.h>
#include <Library/MemEncryptSevLib.h>
#include <Library/PcdLib.h>
#include <Register/Amd/Cpuid.h>
#include <Register/Amd/Msr.h>
#include <Register/Cpuid.h>
#include <Uefi/UefiBaseType.h>
 
STATIC
SEC_SEV_ES_WORK_AREA *
EFIAPI
GetSevEsWorkArea (
  VOID
  )
{
  OVMF_WORK_AREA  *WorkArea;
 
  WorkArea = (OVMF_WORK_AREA *)FixedPcdGet32 (PcdOvmfWorkAreaBase);
 
  //
  // If its not SEV guest then SevEsWorkArea is not valid.
  //
  if ((WorkArea == NULL) || (WorkArea->Header.GuestType != CcGuestTypeAmdSev)) {
    return NULL;
  }
 
  return (SEC_SEV_ES_WORK_AREA *)FixedPcdGet32 (PcdSevEsWorkAreaBase);
}
 
STATIC
UINT32
EFIAPI
InternalMemEncryptSevStatus (
  VOID
  )
{
  SEC_SEV_ES_WORK_AREA  *SevEsWorkArea;
 
  SevEsWorkArea = GetSevEsWorkArea ();
  if (SevEsWorkArea == NULL) {
    return 0;
  }
 
  return (UINT32)(UINTN)SevEsWorkArea->SevStatusMsrValue;
}
 
BOOLEAN
EFIAPI
MemEncryptSevSnpIsEnabled (
  VOID
  )
{
  MSR_SEV_STATUS_REGISTER  Msr;
 
  Msr.Uint32 = InternalMemEncryptSevStatus ();
 
  return Msr.Bits.SevSnpBit ? TRUE : FALSE;
}
 
BOOLEAN
EFIAPI
MemEncryptSevEsIsEnabled (
  VOID
  )
{
  MSR_SEV_STATUS_REGISTER  Msr;
 
  Msr.Uint32 = InternalMemEncryptSevStatus ();
 
  return Msr.Bits.SevEsBit ? TRUE : FALSE;
}
 
BOOLEAN
EFIAPI
MemEncryptSevIsEnabled (
  VOID
  )
{
  MSR_SEV_STATUS_REGISTER  Msr;
 
  Msr.Uint32 = InternalMemEncryptSevStatus ();
 
  return Msr.Bits.SevBit ? TRUE : FALSE;
}
 
UINT64
EFIAPI
MemEncryptSevGetEncryptionMask (
  VOID
  )
{
  SEC_SEV_ES_WORK_AREA  *SevEsWorkArea;
 
  SevEsWorkArea = GetSevEsWorkArea ();
  if (SevEsWorkArea == NULL) {
    return 0;
  }
 
  return SevEsWorkArea->EncryptionMask;
}
 
BOOLEAN
EFIAPI
MemEncryptSevEsDebugVirtualizationIsEnabled (
  VOID
  )
{
  MSR_SEV_STATUS_REGISTER  Msr;
 
  Msr.Uint32 = InternalMemEncryptSevStatus ();
 
  return Msr.Bits.DebugVirtualization ? TRUE : FALSE;
}
 
RETURN_STATUS
EFIAPI
MemEncryptSevLocateInitialSmramSaveStateMapPages (
  OUT UINTN  *BaseAddress,
  OUT UINTN  *NumberOfPages
  )
{
  return RETURN_UNSUPPORTED;
}