1 files changed, 108 insertions, 0 deletions
diff --git a/Core/UefiCpuPkg/Library/SmmCpuPlatformHookLibNull/SmmCpuPlatformHookLibNull.c b/Core/UefiCpuPkg/Library/SmmCpuPlatformHookLibNull/SmmCpuPlatformHookLibNull.c
new file mode 100644
index 0000000000..efb61fa6f8
--- /dev/null
+++ b/Core/UefiCpuPkg/Library/SmmCpuPlatformHookLibNull/SmmCpuPlatformHookLibNull.c
@@ -0,0 +1,108 @@
+/** @file
+SMM CPU Platform Hook NULL library instance.
+
+Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
+This program and the accompanying materials
+are licensed and made available under the terms and conditions of the BSD License
+which accompanies this distribution.  The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+#include <PiSmm.h>
+#include <Library/SmmCpuPlatformHookLib.h>
+
+/**
+  Checks if platform produces a valid SMI.
+
+  This function checks if platform produces a valid SMI. This function is
+  called at SMM entry to detect if this is a spurious SMI. This function
+  must be implemented in an MP safe way because it is called by multiple CPU
+  threads.
+
+  @retval TRUE              There is a valid SMI
+  @retval FALSE             There is no valid SMI
+
+**/
+BOOLEAN
+EFIAPI
+PlatformValidSmi (
+  VOID
+  )
+{
+  return TRUE;
+}
+
+/**
+  Clears platform top level SMI status bit.
+
+  This function clears platform top level SMI status bit.
+
+  @retval TRUE              The platform top level SMI status is cleared.
+  @retval FALSE             The platform top level SMI status cannot be cleared.
+
+**/
+BOOLEAN
+EFIAPI
+ClearTopLevelSmiStatus (
+  VOID
+  )
+{
+  return TRUE;
+}
+
+/**
+  Performs platform specific way of SMM BSP election.
+
+  This function performs platform specific way of SMM BSP election.
+
+  @param  IsBsp             Output parameter. TRUE: the CPU this function executes
+                            on is elected to be the SMM BSP. FALSE: the CPU this
+                            function executes on is to be SMM AP.
+
+  @retval EFI_SUCCESS       The function executes successfully.
+  @retval EFI_NOT_READY     The function does not determine whether this CPU should be
+                            BSP or AP. This may occur if hardware init sequence to
+                            enable the determination is yet to be done, or the function
+                            chooses not to do BSP election and will let SMM CPU driver to
+                            use its default BSP election process.
+  @retval EFI_DEVICE_ERROR  The function cannot determine whether this CPU should be
+                            BSP or AP due to hardware error.
+
+**/
+EFI_STATUS
+EFIAPI
+PlatformSmmBspElection (
+  OUT BOOLEAN     *IsBsp
+  )
+{
+  return EFI_NOT_READY;
+}
+
+/**
+  Get platform page table attribute.
+
+  This function gets page table attribute of platform.
+
+  @param  Address        Input parameter. Obtain the page table entries attribute on this address.
+  @param  PageSize       Output parameter. The size of the page.
+  @param  NumOfPages     Output parameter. Number of page.
+  @param  PageAttribute  Output parameter. Paging Attributes (WB, UC, etc).
+
+  @retval EFI_SUCCESS      The platform page table attribute from the address is determined.
+  @retval EFI_UNSUPPORTED  The platform does not support getting page table attribute for the address.
+
+**/
+EFI_STATUS
+EFIAPI
+GetPlatformPageTableAttribute (
+  IN  UINT64                Address,
+  IN OUT SMM_PAGE_SIZE_TYPE *PageSize,
+  IN OUT UINTN              *NumOfPages,
+  IN OUT UINTN              *PageAttribute
+  )
+{
+  return EFI_UNSUPPORTED;
+}