1 files changed, 84 insertions, 0 deletions
diff --git a/roms/edk2/OvmfPkg/Library/BaseMemEncryptSevLib/Ia32/MemEncryptSevLib.c b/roms/edk2/OvmfPkg/Library/BaseMemEncryptSevLib/Ia32/MemEncryptSevLib.c
new file mode 100644
index 000000000..b4f6e5738
--- /dev/null
+++ b/roms/edk2/OvmfPkg/Library/BaseMemEncryptSevLib/Ia32/MemEncryptSevLib.c
@@ -0,0 +1,84 @@
+/** @file
+
+  Secure Encrypted Virtualization (SEV) library helper function
+
+  Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <Library/BaseLib.h>
+#include <Library/DebugLib.h>
+#include <Library/MemEncryptSevLib.h>
+#include <Register/Amd/Cpuid.h>
+#include <Register/Amd/Msr.h>
+#include <Register/Cpuid.h>
+
+/**
+  This function clears memory encryption bit for the memory region specified by
+  BaseAddress and NumPages from the current page table context.
+
+  @param[in]  Cr3BaseAddress          Cr3 Base Address (if zero then use
+                                      current CR3)
+  @param[in]  BaseAddress             The physical address that is the start
+                                      address of a memory region.
+  @param[in]  NumPages                The number of pages from start memory
+                                      region.
+  @param[in]  Flush                   Flush the caches before clearing the bit
+                                      (mostly TRUE except MMIO addresses)
+
+  @retval RETURN_SUCCESS              The attributes were cleared for the
+                                      memory region.
+  @retval RETURN_INVALID_PARAMETER    Number of pages is zero.
+  @retval RETURN_UNSUPPORTED          Clearing the memory encryption attribute
+                                      is not supported
+**/
+RETURN_STATUS
+EFIAPI
+MemEncryptSevClearPageEncMask (
+  IN PHYSICAL_ADDRESS         Cr3BaseAddress,
+  IN PHYSICAL_ADDRESS         BaseAddress,
+  IN UINTN                    NumPages,
+  IN BOOLEAN                  Flush
+  )
+{
+  //
+  // Memory encryption bit is not accessible in 32-bit mode
+  //
+  return RETURN_UNSUPPORTED;
+}
+
+/**
+  This function sets memory encryption bit for the memory region specified by
+  BaseAddress and NumPages from the current page table context.
+
+  @param[in]  Cr3BaseAddress          Cr3 Base Address (if zero then use
+                                      current CR3)
+  @param[in]  BaseAddress             The physical address that is the start
+                                      address of a memory region.
+  @param[in]  NumPages                The number of pages from start memory
+                                      region.
+  @param[in]  Flush                   Flush the caches before setting the bit
+                                      (mostly TRUE except MMIO addresses)
+
+  @retval RETURN_SUCCESS              The attributes were set for the memory
+                                      region.
+  @retval RETURN_INVALID_PARAMETER    Number of pages is zero.
+  @retval RETURN_UNSUPPORTED          Setting the memory encryption attribute
+                                      is not supported
+**/
+RETURN_STATUS
+EFIAPI
+MemEncryptSevSetPageEncMask (
+  IN PHYSICAL_ADDRESS         Cr3BaseAddress,
+  IN PHYSICAL_ADDRESS         BaseAddress,
+  IN UINTN                    NumPages,
+  IN BOOLEAN                  Flush
+  )
+{
+  //
+  // Memory encryption bit is not accessible in 32-bit mode
+  //
+  return RETURN_UNSUPPORTED;
+}