[PATCH v4 4/5] StandaloneMmPkg: Add StandaloneMmIplPei driver.

["Zhang, Hongbin1" <hongbin1.zhang@intel.com>]

Add StandaloneMmIplPei IA32/X64 driver at PEI stage.
FSP will use this driver to load Standalone MM code
to dispatch other Standalone MM drivers.

Signed-off-by: Hongbin1 Zhang <hongbin1.zhang@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Jiaxin Wu <jiaxin.wu@intel.com>
Cc: Sami Mujawar <sami.mujawar@arm.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Supreeth Venkatesh <supreeth.venkatesh@arm.com>
---
 StandaloneMmPkg/Drivers/StandaloneMmIplPei/StandaloneMmIplPei.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/StandaloneMmPkg/Drivers/StandaloneMmIplPei/StandaloneMmIplPei.c b/StandaloneMmPkg/Drivers/StandaloneMmIplPei/StandaloneMmIplPei.c
index 47cc18ecbd..0d0c678f90 100644
--- a/StandaloneMmPkg/Drivers/StandaloneMmIplPei/StandaloneMmIplPei.c
+++ b/StandaloneMmPkg/Drivers/StandaloneMmIplPei/StandaloneMmIplPei.c
@@ -400,8 +400,17 @@ ExecuteSmmCoreFromSmram (
       DEBUG ((DEBUG_INFO, "SMM IPL calling Standalone MM Core at SMRAM address - 0x%016lx\n", gMmCorePrivate->MmCoreEntryPoint));
 
       //
-      // If StandaloneMmIpl driver is IA32 image, but Standalone MM core is X64 image
-      // Switch 32 bit protect mode to X64 mode and load SMM core
+      // If StandaloneMmIpl driver is X64 image, but Standalone MM core is IA32 image
+      // This case is not supported
+      //
+      if ((sizeof (UINTN) == sizeof (UINT64)) && (ImageContext.Machine == EFI_IMAGE_MACHINE_IA32)) {
+        DEBUG ((DEBUG_ERROR, "X64 SMM IPL call IA32 MM core is not supported !\n"));
+        CpuDeadLoop ();
+      }
+
+      //
+      // If StandaloneMmIpl driver is IA32 image, but Standalone MM core is X64 image,
+      // Switch 32 bit protect mode to X64 mode and load SMM core.
       //
       if ((sizeof (UINTN) == sizeof (UINT32)) && (ImageContext.Machine == EFI_IMAGE_MACHINE_X64)) {
         //
-- 
2.37.0.windows.1