IntelFsp2Pkg/FspSecCore: Add FSP-I API for SMM support.

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3993
Add FSP-I API entry point for SMM support.
Also update 64bit API entry code to assign ApiIdx to RAX
to avoid confusion.

Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Signed-off-by: Chasel Chiu <chasel.chiu@intel.com>
Signed-off-by: Hongbin1 Zhang <hongbin1.zhang@intel.com>
Reviewed-by: Nate DeSimone <nathaniel.l.desimone@intel.com>

IntelFsp2Pkg/FspSecCore/X64/FspApiEntryI.nasm

@@ -0,0 +1,44 @@
+;; @file
+;  Provide FSP API entry points.
+;
+; Copyright (c) 2022, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;;
+
+    SECTION .text
+
+;
+; Following functions will be provided in C
+;
+extern ASM_PFX(FspApiCommon)
+
+;----------------------------------------------------------------------------
+; FspApiCommonContinue API
+;
+; This is the FSP API common entry point to resume the FSP execution
+;
+;----------------------------------------------------------------------------
+global ASM_PFX(FspApiCommonContinue)
+ASM_PFX(FspApiCommonContinue):
+  jmp $
+
+;----------------------------------------------------------------------------
+; FspSmmInit API
+;
+; This FSP API will notify the FSP about the different phases in the boot
+; process
+;
+;----------------------------------------------------------------------------
+global ASM_PFX(FspSmmInitApi)
+ASM_PFX(FspSmmInitApi):
+  mov    rax,  7 ; FSP_API_INDEX.FspSmmInitApiIndex
+  jmp    ASM_PFX(FspApiCommon)
+
+;----------------------------------------------------------------------------
+; Module Entrypoint API
+;----------------------------------------------------------------------------
+global ASM_PFX(_ModuleEntryPoint)
+ASM_PFX(_ModuleEntryPoint):
+  jmp  $
+  ; Add reference to APIs so that it will not be optimized by compiler
+  jmp  ASM_PFX(FspSmmInitApi)