StandaloneMmPkg/MmIpl: build MM communication buffer HOB

MM communication buffer HOB data is for StandaloneMm Core and
MM communicate DXE driver.

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: Wei6 Xu <wei6.xu@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

@@ -8,6 +8,65 @@
 
 #include "StandaloneMmIplPei.h"
 
+/**
+  Build communication buffer HOB.
+
+  @return  MM_COMM_BUFFER     Pointer of MM communication buffer
+
+**/
+MM_COMM_BUFFER *
+MmIplBuildCommBufferHob (
+  VOID
+  )
+{
+  EFI_STATUS      Status;
+  MM_COMM_BUFFER  *MmCommBuffer;
+  UINT64          MmCommBufferPages;
+
+  MmCommBufferPages = PcdGet32 (PcdMmCommBufferPages);
+
+  MmCommBuffer = BuildGuidHob (&gMmCommBufferHobGuid, sizeof (MM_COMM_BUFFER));
+  ASSERT (MmCommBuffer != NULL);
+
+  //
+  // Set MM communicate buffer size
+  //
+  MmCommBuffer->NumberOfPages = MmCommBufferPages;
+
+  //
+  // Allocate runtime memory for MM communicate buffer
+  //
+  MmCommBuffer->PhysicalStart = (EFI_PHYSICAL_ADDRESS)(UINTN)AllocateRuntimePages (MmCommBufferPages);
+  if (MmCommBuffer->PhysicalStart == 0) {
+    DEBUG ((DEBUG_ERROR, "Fail to allocate MM communication buffer\n"));
+    ASSERT (MmCommBuffer->PhysicalStart != 0);
+  }
+
+  //
+  // Build MM unblock memory region HOB for MM communication buffer
+  //
+  Status = MmUnblockMemoryRequest (MmCommBuffer->PhysicalStart, MmCommBufferPages);
+  ASSERT_EFI_ERROR (Status);
+
+  //
+  // Allocate runtime memory for MM communication status parameters :
+  // ReturnStatus, ReturnBufferSize, IsCommBufferValid
+  //
+  MmCommBuffer->Status = (EFI_PHYSICAL_ADDRESS)(UINTN)AllocateRuntimePages (EFI_SIZE_TO_PAGES (sizeof (MM_COMM_BUFFER_STATUS)));
+  if (MmCommBuffer->Status == 0) {
+    DEBUG ((DEBUG_ERROR, "Fail to allocate memory for MM communication status\n"));
+    ASSERT (MmCommBuffer->Status != 0);
+  }
+
+  //
+  // Build MM unblock memory region HOB for MM communication status
+  //
+  Status = MmUnblockMemoryRequest (MmCommBuffer->Status, EFI_SIZE_TO_PAGES (sizeof (MM_COMM_BUFFER_STATUS)));
+  ASSERT_EFI_ERROR (Status);
+
+  return MmCommBuffer;
+}
+
 /**
   The Entry Point for MM IPL at PEI stage.
 
@@ -27,5 +86,13 @@ StandaloneMmIplPeiEntry (
   IN CONST EFI_PEI_SERVICES     **PeiServices
   )
 {
+  MM_COMM_BUFFER  *MmCommBuffer;
+
+  //
+  // Build communication buffer HOB.
+  //
+  MmCommBuffer = MmIplBuildCommBufferHob ();
+  ASSERT (MmCommBuffer != NULL);
+
   return EFI_SUCCESS;
 }

StandaloneMmPkg/Drivers/StandaloneMmIplPei/StandaloneMmIplPei.h

@@ -9,4 +9,10 @@
 #ifndef STANDALONE_MM_IPL_PEI_H_
 #define STANDALONE_MM_IPL_PEI_H_
 
+#include <Guid/MmCommBuffer.h>
+#include <Library/HobLib.h>
+#include <Library/DebugLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/MmUnblockMemoryLib.h>
+
 #endif

StandaloneMmPkg/Drivers/StandaloneMmIplPei/StandaloneMmIplPei.inf

@@ -29,15 +29,22 @@
 [Packages]
   MdePkg/MdePkg.dec
   MdeModulePkg/MdeModulePkg.dec
+  StandaloneMmPkg/StandaloneMmPkg.dec
 
 [LibraryClasses]
   PeimEntryPoint
+  DebugLib
+  HobLib
+  MemoryAllocationLib
+  MmUnblockMemoryLib
 
 [Guids]
+  gMmCommBufferHobGuid
 
 [Ppis]
 
 [Pcd]
+  gEfiMdeModulePkgTokenSpaceGuid.PcdMmCommBufferPages
 
 [Depex]
   TRUE

StandaloneMmPkg/StandaloneMmPkg.dsc

@@ -63,7 +63,10 @@
   MmPlatformHobProducerLib|StandaloneMmPkg/Library/MmPlatformHobProducerLibNull/MmPlatformHobProducerLibNull.inf
 
 [LibraryClasses.common.PEIM]
+  HobLib|MdePkg/Library/PeiHobLib/PeiHobLib.inf
   PeimEntryPoint|MdePkg/Library/PeimEntryPoint/PeimEntryPoint.inf
+  MemoryAllocationLib|MdePkg/Library/PeiMemoryAllocationLib/PeiMemoryAllocationLib.inf
+  MmUnblockMemoryLib|MdePkg/Library/MmUnblockMemoryLib/MmUnblockMemoryLibNull.inf
 
 [LibraryClasses.AARCH64, LibraryClasses.ARM]
   ArmLib|ArmPkg/Library/ArmLib/ArmBaseLib.inf