UefiCpuPkg: Move AsmRelocateApLoopStart from Mpfuncs.nasm to AmdSev.nasm

[mirror_edk2.git] / OvmfPkg / Library / BaseMemEncryptSevLib / SecMemEncryptSevLibInternal.c

/** @file\r
\r
  Secure Encrypted Virtualization (SEV) library helper function\r
\r
  Copyright (c) 2020, Advanced Micro Devices, Inc. All rights reserved.<BR>\r
\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#include <Library/BaseLib.h>\r
#include <Library/DebugLib.h>\r
#include <Library/MemEncryptSevLib.h>\r
#include <Library/PcdLib.h>\r
#include <Register/Amd/Cpuid.h>\r
#include <Register/Amd/Msr.h>\r
#include <Register/Cpuid.h>\r
#include <Uefi/UefiBaseType.h>\r
\r
/**\r
   Read the workarea to determine whether SEV is enabled. If enabled,\r
   then return the SevEsWorkArea pointer.\r
\r
  **/\r
STATIC\r
SEC_SEV_ES_WORK_AREA *\r
EFIAPI\r
GetSevEsWorkArea (\r
  VOID\r
  )\r
{\r
  OVMF_WORK_AREA  *WorkArea;\r
\r
  WorkArea = (OVMF_WORK_AREA *)FixedPcdGet32 (PcdOvmfWorkAreaBase);\r
\r
  //\r
  // If its not SEV guest then SevEsWorkArea is not valid.\r
  //\r
  if ((WorkArea == NULL) || (WorkArea->Header.GuestType != CcGuestTypeAmdSev)) {\r
    return NULL;\r
  }\r
\r
  return (SEC_SEV_ES_WORK_AREA *)FixedPcdGet32 (PcdSevEsWorkAreaBase);\r
}\r
\r
/**\r
  Read the SEV Status MSR value from the workarea\r
\r
  **/\r
STATIC\r
UINT32\r
EFIAPI\r
InternalMemEncryptSevStatus (\r
  VOID\r
  )\r
{\r
  SEC_SEV_ES_WORK_AREA  *SevEsWorkArea;\r
\r
  SevEsWorkArea = GetSevEsWorkArea ();\r
  if (SevEsWorkArea == NULL) {\r
    return 0;\r
  }\r
\r
  return (UINT32)(UINTN)SevEsWorkArea->SevStatusMsrValue;\r
}\r
\r
/**\r
  Returns a boolean to indicate whether SEV-SNP is enabled.\r
\r
  @retval TRUE           SEV-SNP is enabled\r
  @retval FALSE          SEV-SNP is not enabled\r
**/\r
BOOLEAN\r
EFIAPI\r
MemEncryptSevSnpIsEnabled (\r
  VOID\r
  )\r
{\r
  MSR_SEV_STATUS_REGISTER  Msr;\r
\r
  Msr.Uint32 = InternalMemEncryptSevStatus ();\r
\r
  return Msr.Bits.SevSnpBit ? TRUE : FALSE;\r
}\r
\r
/**\r
  Returns a boolean to indicate whether SEV-ES is enabled.\r
\r
  @retval TRUE           SEV-ES is enabled\r
  @retval FALSE          SEV-ES is not enabled\r
**/\r
BOOLEAN\r
EFIAPI\r
MemEncryptSevEsIsEnabled (\r
  VOID\r
  )\r
{\r
  MSR_SEV_STATUS_REGISTER  Msr;\r
\r
  Msr.Uint32 = InternalMemEncryptSevStatus ();\r
\r
  return Msr.Bits.SevEsBit ? TRUE : FALSE;\r
}\r
\r
/**\r
  Returns a boolean to indicate whether SEV is enabled.\r
\r
  @retval TRUE           SEV is enabled\r
  @retval FALSE          SEV is not enabled\r
**/\r
BOOLEAN\r
EFIAPI\r
MemEncryptSevIsEnabled (\r
  VOID\r
  )\r
{\r
  MSR_SEV_STATUS_REGISTER  Msr;\r
\r
  Msr.Uint32 = InternalMemEncryptSevStatus ();\r
\r
  return Msr.Bits.SevBit ? TRUE : FALSE;\r
}\r
\r
/**\r
  Returns the SEV encryption mask.\r
\r
  @return  The SEV pagtable encryption mask\r
**/\r
UINT64\r
EFIAPI\r
MemEncryptSevGetEncryptionMask (\r
  VOID\r
  )\r
{\r
  SEC_SEV_ES_WORK_AREA  *SevEsWorkArea;\r
\r
  SevEsWorkArea = GetSevEsWorkArea ();\r
  if (SevEsWorkArea == NULL) {\r
    return 0;\r
  }\r
\r
  return SevEsWorkArea->EncryptionMask;\r
}\r
\r
/**\r
  Locate the page range that covers the initial (pre-SMBASE-relocation) SMRAM\r
  Save State Map.\r
\r
  @param[out] BaseAddress     The base address of the lowest-address page that\r
                              covers the initial SMRAM Save State Map.\r
\r
  @param[out] NumberOfPages   The number of pages in the page range that covers\r
                              the initial SMRAM Save State Map.\r
\r
  @retval RETURN_SUCCESS      BaseAddress and NumberOfPages have been set on\r
                              output.\r
\r
  @retval RETURN_UNSUPPORTED  SMM is unavailable.\r
**/\r
RETURN_STATUS\r
EFIAPI\r
MemEncryptSevLocateInitialSmramSaveStateMapPages (\r
  OUT UINTN  *BaseAddress,\r
  OUT UINTN  *NumberOfPages\r
  )\r
{\r
  return RETURN_UNSUPPORTED;\r
}\r