OvmfPkg/MemEncryptSevLib: clean up MemEncryptSevClearPageEncMask() decl

[mirror_edk2.git] / OvmfPkg / Library / BaseMemEncryptSevLib / Ia32 / MemEncryptSevLib.c

/** @file\r
\r
  Secure Encrypted Virtualization (SEV) library helper function\r
\r
  Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>\r
\r
  This program and the accompanying materials are licensed and made available\r
  under the terms and conditions of the BSD License which accompanies this\r
  distribution.  The full text of the license may be found at\r
  http://opensource.org/licenses/bsd-license.php\r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
**/\r
\r
#include <Library/BaseLib.h>\r
#include <Library/DebugLib.h>\r
#include <Register/Cpuid.h>\r
#include <Register/Amd/Cpuid.h>\r
#include <Register/Amd/Msr.h>\r
#include <Library/MemEncryptSevLib.h>\r
\r
/**\r
  This function clears memory encryption bit for the memory region specified by\r
  BaseAddress and NumPages from the current page table context.\r
\r
  @param[in]  Cr3BaseAddress          Cr3 Base Address (if zero then use\r
                                      current CR3)\r
  @param[in]  BaseAddress             The physical address that is the start\r
                                      address of a memory region.\r
  @param[in]  NumPages                The number of pages from start memory\r
                                      region.\r
  @param[in]  Flush                   Flush the caches before clearing the bit\r
                                      (mostly TRUE except MMIO addresses)\r
\r
  @retval RETURN_SUCCESS              The attributes were cleared for the\r
                                      memory region.\r
  @retval RETURN_INVALID_PARAMETER    Number of pages is zero.\r
  @retval RETURN_UNSUPPORTED          Clearing the memory encryption attribute\r
                                      is not supported\r
**/\r
RETURN_STATUS\r
EFIAPI\r
MemEncryptSevClearPageEncMask (\r
  IN PHYSICAL_ADDRESS         Cr3BaseAddress,\r
  IN PHYSICAL_ADDRESS         BaseAddress,\r
  IN UINTN                    NumPages,\r
  IN BOOLEAN                  Flush\r
  )\r
{\r
  //\r
  // Memory encryption bit is not accessible in 32-bit mode\r
  //\r
  return RETURN_UNSUPPORTED;\r
}\r
\r
/**\r
  This function sets memory encryption bit for the memory region specified by\r
  BaseAddress and Number of pages from the current page table context.\r
\r
  @param[in]  Cr3BaseAddress        Cr3 Base Address (if zero then use current\r
                                    CR3)\r
  @param[in]  BaseAddress           The physical address that is the start\r
                                    address of a memory region.\r
  @param[in]  NumberOfPages         The number of pages from start memory\r
                                    region.\r
  @param[in]  Flush                 Flush the caches before clearing the bit\r
                                    (mostly TRUE except MMIO addresses)\r
\r
  @retval RETURN_SUCCESS            The attributes were set for the memory\r
                                    region.\r
  @retval RETURN_INVALID_PARAMETER  Number of pages is zero.\r
  @retval RETURN_UNSUPPORTED        Clearing memory encryption attribute is not\r
                                    supported\r
  **/\r
RETURN_STATUS\r
EFIAPI\r
MemEncryptSevSetPageEncMask (\r
  IN PHYSICAL_ADDRESS         Cr3BaseAddress,\r
  IN PHYSICAL_ADDRESS         BaseAddress,\r
  IN UINTN                    NumberOfPages,\r
  IN BOOLEAN                  Flush\r
  )\r
{\r
  //\r
  // Memory encryption bit is not accessible in 32-bit mode\r
  //\r
  return RETURN_UNSUPPORTED;\r
}\r