MdePkg: RISC-V: Add PeiServicesTablePointerLib

Based on PI 1.9, the PEI service pointer will be stored in the
scratch register.

Signed-off-by: Tuan Phan <tphan@ventanamicro.com>

MdePkg/Library/PeiServicesTablePointerLibRiscV/PeiServicesTablePointer.c

@@ -0,0 +1,77 @@
+/** @file
+  PEI Services Table Pointer Library.
+
+  According to PI specification, the peiservice pointer is stored in the SSCRATCH
+  register of RISC-V architecture.
+
+  Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2025, Ventana Micro Systems Inc. All rights reserved.<BR>
+
+  SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+#include <PiPei.h>
+#include <Library/BaseLib.h>
+#include <Library/DebugLib.h>
+#include <Library/PeiServicesTablePointerLib.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);
+  RiscVSetSupervisorScratch ((UINT64)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
+  )
+{
+  return (CONST EFI_PEI_SERVICES **)RiscVGetSupervisorScratch ();
+}
+
+/**
+  Perform CPU specific actions required to migrate the PEI Services Table
+  pointer from temporary RAM to permanent RAM.
+
+**/
+VOID
+EFIAPI
+MigratePeiServicesTablePointer (
+  VOID
+  )
+{
+  //
+  //  PEI Services Table pointer is stored in CSR_SSCRATCH register. No additional
+  //  migration actions are required.
+  //
+  return;
+}

MdePkg/Library/PeiServicesTablePointerLibRiscV/PeiServicesTablePointerLib.inf

@@ -0,0 +1,33 @@
+## @file
+# Instance of PEI Services Table Pointer Library using global variable for the table pointer.
+#
+# Copyright (c) 2007 - 2018, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2025, Ventana Micro Systems Inc. All rights reserved.<BR>
+#
+#  SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+#
+##
+
+[Defines]
+  INF_VERSION                    = 1.30
+  BASE_NAME                      = PeiServicesTablePointerLib
+  MODULE_UNI_FILE                = PeiServicesTablePointerLib.uni
+  FILE_GUID                      = 3b5bccaa-366f-42d1-93b1-64dd7ecb9fa7
+  MODULE_TYPE                    = PEIM
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = PeiServicesTablePointerLib|PEIM PEI_CORE SEC
+
+#
+#  VALID_ARCHITECTURES           = RISCV64
+#
+
+[Sources]
+  PeiServicesTablePointer.c
+
+[Packages]
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  BaseLib
+  DebugLib

MdePkg/Library/PeiServicesTablePointerLibRiscV/PeiServicesTablePointerLib.uni

@@ -0,0 +1,15 @@
+// /** @file
+// Instance of PEI Services Table Pointer Library for RISCV.
+//
+// Copyright (c) 2007 - 2014, Intel Corporation. All rights reserved.<BR>
+// Copyright (c) 2025, Ventana Micro Systems Inc. All rights reserved.<BR>
+//
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+// **/
+
+
+#string STR_MODULE_ABSTRACT             #language en-US "Instance of PEI Services Table Pointer Library using global variable for the table pointer"
+
+#string STR_MODULE_DESCRIPTION          #language en-US "The PEI Services Table Pointer Library implementation that retrieves a pointer to the PEI Services Table from a global variable. Not available to modules that execute from read-only memory."
+

MdePkg/MdePkg.dsc

@@ -213,6 +213,7 @@
   MdePkg/Library/BaseRiscVSbiLib/BaseRiscVSbiLib.inf
   MdePkg/Library/BaseSerialPortLibRiscVSbiLib/BaseSerialPortLibRiscVSbiLib.inf
   MdePkg/Library/BaseSerialPortLibRiscVSbiLib/BaseSerialPortLibRiscVSbiLibRam.inf
+  MdePkg/Library/PeiServicesTablePointerLibRiscV/PeiServicesTablePointerLib.inf
 
 [Components.LOONGARCH64]
   MdePkg/Library/PeiServicesTablePointerLibKs0/PeiServicesTablePointerLibKs0.inf