OvmfPkg: Replace BSD License with BSD+Patent License

[mirror_edk2.git] / OvmfPkg / Library / BaseMemEncryptSevLib / X64 / 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
  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 <Register/Amd/Cpuid.h>\r
#include <Register/Amd/Msr.h>\r
#include <Register/Cpuid.h>\r
\r
#include "VirtualMemory.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
  return InternalMemEncryptSevSetMemoryDecrypted (\r
           Cr3BaseAddress,\r
           BaseAddress,\r
           EFI_PAGES_TO_SIZE (NumPages),\r
           Flush\r
           );\r
}\r
\r
/**\r
  This function sets 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 setting 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          Setting the memory encryption attribute\r
                                      is not supported\r
**/\r
RETURN_STATUS\r
EFIAPI\r
MemEncryptSevSetPageEncMask (\r
  IN PHYSICAL_ADDRESS         Cr3BaseAddress,\r
  IN PHYSICAL_ADDRESS         BaseAddress,\r
  IN UINTN                    NumPages,\r
  IN BOOLEAN                  Flush\r
  )\r
{\r
  return InternalMemEncryptSevSetMemoryEncrypted (\r
           Cr3BaseAddress,\r
           BaseAddress,\r
           EFI_PAGES_TO_SIZE (NumPages),\r
           Flush\r
           );\r
}\r