1 files changed, 95 insertions, 0 deletions
diff --git a/roms/edk2/EmulatorPkg/Library/PeiServicesTablePointerLibMagicPage/PeiServicesTablePointer.c b/roms/edk2/EmulatorPkg/Library/PeiServicesTablePointerLibMagicPage/PeiServicesTablePointer.c
new file mode 100644
index 000000000..9d6e1dfd8
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+++ b/roms/edk2/EmulatorPkg/Library/PeiServicesTablePointerLibMagicPage/PeiServicesTablePointer.c
@@ -0,0 +1,95 @@
+/** @file
+  PEI Services Table Pointer Library.
+
+  Store PEI Services Table pointer via gEmulatorPkgTokenSpaceGuid.PcdPeiServicesTablePage.
+  This emulates a platform SRAM. The PI mechaism does not work in the emulator due to
+  lack of privledge.
+
+  Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
+  Portiions copyrigth (c) 2011, Apple Inc. All rights reserved.
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <PiPei.h>
+#include <Library/PeiServicesTablePointerLib.h>
+#include <Library/DebugLib.h>
+#include <Library/EmuMagicPageLib.h>
+
+
+/**
+  Caches a pointer PEI Services Table.
+
+  Caches the pointer to the PEI Services Table specified by PeiServicesTablePointer
+  in a CPU specific manner as specified in the CPU binding section of the Platform Initialization
+  Pre-EFI Initialization Core Interface Specification.
+
+  If PeiServicesTablePointer is NULL, then ASSERT().
+
+  @param    PeiServicesTablePointer   The address of PeiServices pointer.
+**/
+VOID
+EFIAPI
+SetPeiServicesTablePointer (
+  IN CONST EFI_PEI_SERVICES ** PeiServicesTablePointer
+  )
+{
+  ASSERT (PeiServicesTablePointer != NULL);
+  ASSERT (*PeiServicesTablePointer != NULL);
+  EMU_MAGIC_PAGE()->PeiServicesTablePointer = PeiServicesTablePointer;
+}
+
+/**
+  Retrieves the cached value of the PEI Services Table pointer.
+
+  Returns the cached value of the PEI Services Table pointer in a CPU specific manner
+  as specified in the CPU binding section of the Platform Initialization Pre-EFI
+  Initialization Core Interface Specification.
+
+  If the cached PEI Services Table pointer is NULL, then ASSERT().
+
+  @return  The pointer to PeiServices.
+
+**/
+CONST EFI_PEI_SERVICES **
+EFIAPI
+GetPeiServicesTablePointer (
+  VOID
+  )
+{
+  CONST EFI_PEI_SERVICES **PeiServicesTablePointer;
+
+  PeiServicesTablePointer = EMU_MAGIC_PAGE()->PeiServicesTablePointer;
+  ASSERT (PeiServicesTablePointer != NULL);
+  ASSERT (*PeiServicesTablePointer != NULL);
+  return PeiServicesTablePointer;
+}
+
+/**
+  Perform CPU specific actions required to migrate the PEI Services Table
+  pointer from temporary RAM to permanent RAM.
+
+  For IA32 CPUs, the PEI Services Table pointer is stored in the 4 bytes
+  immediately preceding the Interrupt Descriptor Table (IDT) in memory.
+  For X64 CPUs, the PEI Services Table pointer is stored in the 8 bytes
+  immediately preceding the Interrupt Descriptor Table (IDT) in memory.
+  For Itanium and ARM CPUs, a the PEI Services Table Pointer is stored in
+  a dedicated CPU register.  This means that there is no memory storage
+  associated with storing the PEI Services Table pointer, so no additional
+  migration actions are required for Itanium or ARM CPUs.
+
+**/
+VOID
+EFIAPI
+MigratePeiServicesTablePointer (
+  VOID
+  )
+{
+  //
+  //  PEI Services Table pointer is cached in SRAM. No additional
+  //  migration actions are required.
+  //
+  return;
+}
+
+