IntelFsp2Pkg: FSP should support input UPD as NULL.

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4114

FSP specification supports input UPD as NULL cases which FSP will
use built-in UPD region instead.
FSP should not return INVALID_PARAMETER in such cases.

In FSP-T entry point case, the valid FSP-T UPD region pointer will be
passed to platform FSP code to consume.
In FSP-M and FSP-S cases, valid UPD pointer will be decided when
updating corresponding pointer field in FspGlobalData.

Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Signed-off-by: Chasel Chiu <chasel.chiu@intel.com>
Reviewed-by: Nate DeSimone <nathaniel.l.desimone@intel.com>
Reviewed-by: Ted Kuo <ted.kuo@intel.com>

IntelFsp2Pkg/FspSecCore/X64/FspApiEntryT.nasm

@@ -21,7 +21,7 @@ extern   ASM_PFX(PcdGet32 (PcdFspReservedBufferSize))
 ; Following functions will be provided in PlatformSecLib
 ;
 extern ASM_PFX(AsmGetFspBaseAddress)
-extern ASM_PFX(AsmGetFspInfoHeader)
+extern ASM_PFX(AsmGetFspInfoHeaderNoStack)
 ;extern ASM_PFX(LoadMicrocode)    ; @todo: needs a weak implementation
 extern ASM_PFX(SecPlatformInit)   ; @todo: needs a weak implementation
 extern ASM_PFX(SecCarInit)
@@ -87,6 +87,14 @@ struc LoadMicrocodeParamsFsp24
     .size:
 endstruc
 
+%macro CALL_RDI  1
+
+  mov     rdi,  %%ReturnAddress
+  jmp     %1
+%%ReturnAddress:
+
+%endmacro
+
 ;
 ; @todo: The strong/weak implementation does not work.
 ;        This needs to be reviewed later.
@@ -116,8 +124,7 @@ ASM_PFX(LoadMicrocodeDefault):
    ; Inputs:
    ;   rcx -> LoadMicrocodeParams pointer
    ; Register Usage:
-   ;   rsp  Preserved
-   ;   All others destroyed
+   ;   All are destroyed
    ; Assumptions:
    ;   No memory available, stack is hard-coded and used for return address
    ;   Executed by SBSP and NBSP
@@ -420,10 +427,6 @@ ASM_PFX(TempRamInitApi):
   ENABLE_SSE
   ENABLE_AVX
   ;
-  ; Save Input Parameter in YMM10
-  ;
-  SAVE_RCX
-  ;
   ; Save RBP, RBX, RSI, RDI and RSP in YMM7, YMM8 and YMM6
   ;
   SAVE_REGS
@@ -433,6 +436,22 @@ ASM_PFX(TempRamInitApi):
   ;
   SAVE_BFV  rbp
 
+  ;
+  ; Save Input Parameter in YMM10
+  ;
+  cmp       rcx, 0
+  jnz       ParamValid
+
+  ;
+  ; Fall back to default UPD
+  ;
+  CALL_RDI  ASM_PFX(AsmGetFspInfoHeaderNoStack)
+  xor       rcx, rcx
+  mov       ecx,  DWORD [rax + 01Ch]      ; Read FsptImageBaseAddress
+  add       ecx,  DWORD [rax + 024h]      ; Get Cfg Region base address = FsptImageBaseAddress + CfgRegionOffset
+ParamValid:
+  SAVE_RCX
+
   ;
   ; Save timestamp into YMM6
   ;
@@ -441,13 +460,6 @@ ASM_PFX(TempRamInitApi):
   or        rax, rdx
   SAVE_TS   rax
 
-  ;
-  ; Check Parameter
-  ;
-  cmp       rcx, 0
-  mov       rcx, 08000000000000002h
-  jz        TempRamInitExit
-
   ;
   ; Sec Platform Init
   ;