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

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

/** @file\r
\r
  Secure Encrypted Virtualization (SEV) library helper function\r
\r
  Copyright (c) 2017 - 2020, 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
/**\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
\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
  )\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 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
\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
  )\r
{\r
  //\r
  // Memory encryption bit is not accessible in 32-bit mode\r
  //\r
  return RETURN_UNSUPPORTED;\r
}\r
\r
/**\r
  Returns the encryption state of the specified virtual address range.\r
\r
  @param[in]  Cr3BaseAddress          Cr3 Base Address (if zero then use\r
                                      current CR3)\r
  @param[in]  BaseAddress             Base address to check\r
  @param[in]  Length                  Length of virtual address range\r
\r
  @retval MemEncryptSevAddressRangeUnencrypted  Address range is mapped\r
                                                unencrypted\r
  @retval MemEncryptSevAddressRangeEncrypted    Address range is mapped\r
                                                encrypted\r
  @retval MemEncryptSevAddressRangeMixed        Address range is mapped mixed\r
  @retval MemEncryptSevAddressRangeError        Address range is not mapped\r
**/\r
MEM_ENCRYPT_SEV_ADDRESS_RANGE_STATE\r
EFIAPI\r
MemEncryptSevGetAddressRangeState (\r
  IN PHYSICAL_ADDRESS  Cr3BaseAddress,\r
  IN PHYSICAL_ADDRESS  BaseAddress,\r
  IN UINTN             Length\r
  )\r
{\r
  //\r
  // Memory is always encrypted in 32-bit mode\r
  //\r
  return MemEncryptSevAddressRangeEncrypted;\r
}\r
\r
/**\r
  This function clears memory encryption bit for the MMIO region specified by\r
  BaseAddress and NumPages.\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 MMIO region.\r
  @param[in]  NumPages                The number of pages from start memory\r
                                      region.\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
MemEncryptSevClearMmioPageEncMask (\r
  IN PHYSICAL_ADDRESS  Cr3BaseAddress,\r
  IN PHYSICAL_ADDRESS  BaseAddress,\r
  IN UINTN             NumPages\r
  )\r
{\r
  //\r
  // Memory encryption bit is not accessible in 32-bit mode\r
  //\r
  return RETURN_UNSUPPORTED;\r
}\r
\r
/**\r
  Pre-validate the system RAM when SEV-SNP is enabled in the guest VM.\r
\r
  @param[in]  BaseAddress             Base address\r
  @param[in]  NumPages                Number of pages starting from the base address\r
\r
**/\r
VOID\r
EFIAPI\r
MemEncryptSevSnpPreValidateSystemRam (\r
  IN PHYSICAL_ADDRESS  BaseAddress,\r
  IN UINTN             NumPages\r
  )\r
{\r
  ASSERT (FALSE);\r
}\r