PI v1.5 Specification Volume 4 defines Management Mode Core Interface
and defines EFI_MM_COMMUNICATION_PROTOCOL. This protocol provides a
means of communicating between drivers outside of MM and MMI
handlers inside of MM.

This patch implements the EFI_MM_COMMUNICATION_PROTOCOL DXE runtime
driver for AARCH64 platforms. It uses SMCs allocated from the standard
SMC range defined in DEN0060A_ARM_MM_Interface_Specification.pdf
to communicate with the standalone MM environment in the secure world.

This patch also adds the MM Communication driver (.inf) file to
define entry point for this driver and other compile
related information the driver needs.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Achin Gupta <achin.gu...@arm.com>
Signed-off-by: Supreeth Venkatesh <supreeth.venkat...@arm.com>
---
 .../Drivers/MmCommunicationDxe/MmCommunication.c   | 339 +++++++++++++++++++++
 .../Drivers/MmCommunicationDxe/MmCommunication.inf |  50 +++
 2 files changed, 389 insertions(+)
 create mode 100644 ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.c
 create mode 100644 ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.inf

diff --git a/ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.c 
b/ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.c
new file mode 100644
index 0000000000..e801c1c601
--- /dev/null
+++ b/ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.c
@@ -0,0 +1,339 @@
+/** @file
+
+  Copyright (c) 2016-2017, ARM Limited. All rights reserved.
+
+  This program and the accompanying materials
+  are licensed and made available under the terms and conditions of the BSD 
License
+  which accompanies this distribution.  The full text of the license may be 
found at
+  http://opensource.org/licenses/bsd-license.php
+
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+**/
+
+#include <Library/ArmLib.h>
+#include <Library/ArmSmcLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/DebugLib.h>
+#include <Library/DxeServicesTableLib.h>
+#include <Library/HobLib.h>
+#include <Library/PcdLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiRuntimeServicesTableLib.h>
+
+#include <Protocol/MmCommunication.h>
+
+#include <IndustryStandard/ArmStdSmc.h>
+
+//
+// Address, Length of the pre-allocated buffer for communication with the 
secure
+// world.
+//
+STATIC ARM_MEMORY_REGION_DESCRIPTOR  mNsCommBuffMemRegion;
+
+// Notification event when virtual address map is set.
+STATIC EFI_EVENT  mSetVirtualAddressMapEvent;
+
+//
+// Handle to install the MM Communication Protocol
+//
+STATIC EFI_HANDLE  mMmCommunicateHandle;
+
+/**
+  Communicates with a registered handler.
+
+  This function provides an interface to send and receive messages to the
+  Standalone MM environment on behalf of UEFI services.  This function is part
+  of the MM Communication Protocol that may be called in physical mode prior to
+  SetVirtualAddressMap() and in virtual mode after SetVirtualAddressMap().
+
+  @param[in]      This                The EFI_MM_COMMUNICATION_PROTOCOL
+                                      instance.
+  @param[in, out] CommBuffer          A pointer to the buffer to convey
+                                      into MMRAM.
+  @param[in, out] CommSize            The size of the data buffer being
+                                      passed in. This is optional.
+
+  @retval EFI_SUCCESS                 The message was successfully posted.
+  @retval EFI_INVALID_PARAMETER       The CommBuffer was NULL.
+  @retval EFI_BAD_BUFFER_SIZE         The buffer size is incorrect for the MM
+                                      implementation. If this error is
+                                      returned, the MessageLength field in
+                                      the CommBuffer header or the integer
+                                      pointed by CommSize are updated to 
reflect
+                                      the maximum payload size the
+                                      implementation can accommodate.
+  @retval EFI_ACCESS_DENIED           The CommunicateBuffer parameter
+                                      or CommSize parameter, if not omitted,
+                                      are in address range that cannot be
+                                      accessed by the MM environment
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+MmCommunicationCommunicate (
+  IN CONST EFI_MM_COMMUNICATION_PROTOCOL  *This,
+  IN OUT VOID                             *CommBuffer,
+  IN OUT UINTN                            *CommSize OPTIONAL
+  )
+{
+  EFI_MM_COMMUNICATE_HEADER   *CommunicateHeader;
+  ARM_SMC_ARGS                CommunicateSmcArgs;
+  EFI_STATUS                  Status;
+  UINTN                       BufferSize;
+
+  CommunicateHeader = CommBuffer;
+  Status = EFI_ACCESS_DENIED;
+  BufferSize = 0;
+
+  ZeroMem (&CommunicateSmcArgs, sizeof (ARM_SMC_ARGS));
+
+  //
+  // Check parameters
+  //
+  if (CommBuffer == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  // If the length of the CommBuffer is 0 then return the expected length.
+  if (CommSize) {
+    if (*CommSize == 0) {
+      *CommSize = mNsCommBuffMemRegion.Length;
+      return EFI_BAD_BUFFER_SIZE;
+    }
+    //
+    // CommSize must hold HeaderGuid and MessageLength
+    //
+    if (*CommSize < sizeof (EFI_MM_COMMUNICATE_HEADER)) {
+        return EFI_INVALID_PARAMETER;
+    }
+    BufferSize = *CommSize;
+  } else {
+    BufferSize = CommunicateHeader->MessageLength +
+                 sizeof (CommunicateHeader->HeaderGuid) +
+                 sizeof (CommunicateHeader->MessageLength);
+  }
+
+  //
+  // If the buffer size is 0 or greater than what can be tolerated by the MM
+  // environment then return the expected size.
+  //
+  if ((BufferSize == 0) ||
+      (BufferSize > mNsCommBuffMemRegion.Length)) {
+    CommunicateHeader->MessageLength = mNsCommBuffMemRegion.Length -
+                                       sizeof (CommunicateHeader->HeaderGuid) -
+                                       sizeof 
(CommunicateHeader->MessageLength);
+    return EFI_BAD_BUFFER_SIZE;
+  }
+
+  // SMC Function ID
+  CommunicateSmcArgs.Arg0 = ARM_SMC_ID_MM_COMMUNICATE_AARCH64;
+
+  // Reserved for Future. Must be Zero.
+  CommunicateSmcArgs.Arg1 = 0;
+
+  if (mNsCommBuffMemRegion.VirtualBase) {
+    CopyMem ((VOID *)mNsCommBuffMemRegion.VirtualBase, CommBuffer, BufferSize);
+  } else {
+    return EFI_ACCESS_DENIED;
+  }
+
+  // For the SMC64 version, this parameter is a 64-bit Physical Address (PA)
+  // or Intermediate Physical Address (IPA).
+  // For the SMC32 version, this parameter is a 32-bit PA or IPA.
+  CommunicateSmcArgs.Arg2 = (UINTN)mNsCommBuffMemRegion.PhysicalBase;
+
+  // comm_size_address is a PA or an IPA that holds the size of the
+  // communication buffer being passed in. This parameter is optional
+  // and can be omitted by passing a zero.
+  // ARM does not recommend using it since this might require the
+  // implementation to create a separate memory mapping for the parameter.
+  // ARM recommends storing the buffer size in the buffer itself.
+  CommunicateSmcArgs.Arg3 = 0;
+
+  // Call the Standalone MM environment.
+  ArmCallSmc (&CommunicateSmcArgs);
+
+  switch (CommunicateSmcArgs.Arg0) {
+  case ARM_SMC_MM_RET_SUCCESS:
+    // On exit, the size of data being returned is inferred from
+    // CommSize or MessageLength + Header.
+    CopyMem (CommBuffer,
+             (const VOID *)mNsCommBuffMemRegion.VirtualBase,
+             BufferSize);
+    Status = EFI_SUCCESS;
+    break;
+
+  case ARM_SMC_MM_RET_NOT_SUPPORTED:
+  case ARM_SMC_MM_RET_INVALID_PARAMS:
+    Status = EFI_INVALID_PARAMETER;
+    break;
+
+  case ARM_SMC_MM_RET_DENIED:
+    Status = EFI_ACCESS_DENIED;
+    break;
+
+  case ARM_SMC_MM_RET_NO_MEMORY:
+    // Unexpected error since the CommSize was checked for zero length
+    // prior to issuing the SMC
+  default:
+    Status = EFI_ACCESS_DENIED;
+    ASSERT (0);
+  }
+
+  return Status;
+}
+
+//
+// MM Communication Protocol instance
+//
+EFI_MM_COMMUNICATION_PROTOCOL  mMmCommunication = {
+  MmCommunicationCommunicate
+};
+
+/**
+  Notification callback on SetVirtualAddressMap event.
+
+  This function notifies the MM communication protocol interface on
+  SetVirtualAddressMap event and converts pointers used in this driver
+  from physical to virtual address.
+
+  @param  Event          SetVirtualAddressMap event.
+  @param  Context        A context when the SetVirtualAddressMap triggered.
+
+  @retval EFI_SUCCESS    The function executed successfully.
+  @retval Other          Some error occurred when executing this function.
+
+**/
+STATIC
+VOID
+EFIAPI
+NotifySetVirtualAddressMap (
+  IN EFI_EVENT  Event,
+  IN VOID      *Context
+  )
+{
+  EFI_STATUS  Status;
+
+  Status = gRT->ConvertPointer (EFI_OPTIONAL_PTR,
+                                (VOID **)&mNsCommBuffMemRegion.VirtualBase
+                               );
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "NotifySetVirtualAddressMap():"
+            " Unable to convert MM runtime pointer. Status:0x%r\n", Status));
+  }
+
+}
+
+/**
+  The Entry Point for MM Communication
+
+  This function installs the MM communication protocol interface and finds out
+  what type of buffer management will be required prior to invoking the
+  communication SMC.
+
+  @param  ImageHandle    The firmware allocated handle for the EFI image.
+  @param  SystemTable    A pointer to the EFI System Table.
+
+  @retval EFI_SUCCESS    The entry point is executed successfully.
+  @retval Other          Some error occurred when executing this entry point.
+
+**/
+EFI_STATUS
+EFIAPI
+MmCommunicationInitialize (
+  IN EFI_HANDLE         ImageHandle,
+  IN EFI_SYSTEM_TABLE  *SystemTable
+  )
+{
+  EFI_STATUS                 Status;
+
+  mNsCommBuffMemRegion.PhysicalBase = PcdGet64 (PcdMmBufferBase);
+  // During boot , Virtual and Physical are same
+  mNsCommBuffMemRegion.VirtualBase = mNsCommBuffMemRegion.PhysicalBase;
+  mNsCommBuffMemRegion.Length = PcdGet64 (PcdMmBufferSize);
+
+  if (mNsCommBuffMemRegion.PhysicalBase == 0) {
+    DEBUG ((DEBUG_ERROR, "MmCommunicateInitialize: "
+            "Invalid MM Buffer Base Address.\n"));
+    goto ReturnErrorStatus;
+  }
+
+  if (mNsCommBuffMemRegion.Length == 0) {
+    DEBUG ((DEBUG_ERROR, "MmCommunicateInitialize: "
+            "Maximum Buffer Size is zero.\n"));
+    goto ReturnErrorStatus;
+  }
+
+  Status = gDS->AddMemorySpace (EfiGcdMemoryTypeSystemMemory,
+                                mNsCommBuffMemRegion.PhysicalBase,
+                                mNsCommBuffMemRegion.Length,
+                                EFI_MEMORY_WB |
+                                EFI_MEMORY_XP |
+                                EFI_MEMORY_RUNTIME);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "MmCommunicateInitialize: "
+            "Failed to add MM-NS Buffer Memory Space\n"));
+    goto ReturnErrorStatus;
+  }
+
+  Status = gDS->SetMemorySpaceAttributes(mNsCommBuffMemRegion.PhysicalBase,
+                                         mNsCommBuffMemRegion.Length,
+                                         EFI_MEMORY_WB | EFI_MEMORY_XP);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "MmCommunicateInitialize: "
+            "Failed to set MM-NS Buffer Memory attributes\n"));
+    goto CleanAddedMemorySpace;
+  }
+
+  Status = gBS->AllocatePages (AllocateAddress,
+                               EfiRuntimeServicesData,
+                               EFI_SIZE_TO_PAGES (mNsCommBuffMemRegion.Length),
+                               &mNsCommBuffMemRegion.PhysicalBase);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "MmCommunicateInitialize: "
+            "Failed to allocate MM-NS Buffer Memory Space\n"));
+    goto CleanAddedMemorySpace;
+  }
+
+  // Install the communication protocol
+  Status = gBS->InstallProtocolInterface (&mMmCommunicateHandle,
+                                          &gEfiMmCommunicationProtocolGuid,
+                                          EFI_NATIVE_INTERFACE,
+                                          &mMmCommunication);
+  if (EFI_ERROR(Status)) {
+    DEBUG ((DEBUG_ERROR, "MmCommunicationInitialize: "
+            "Failed to install MM communication protocol\n"));
+    goto CleanAllocatedPages;
+  }
+
+  // Register notification callback when  virtual address is associated
+  // with the physical address.
+  // Create a Set Virtual Address Map event.
+  //
+  Status = gBS->CreateEvent (EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE,  // Type
+                             TPL_NOTIFY,                         // NotifyTpl
+                             NotifySetVirtualAddressMap,         // 
NotifyFunction
+                             NULL,                               // 
NotifyContext
+                             &mSetVirtualAddressMapEvent         // Event
+                            );
+  if (Status == EFI_SUCCESS) {
+    return Status;
+  }
+
+  gBS->UninstallProtocolInterface(mMmCommunicateHandle,
+                                  &gEfiMmCommunicationProtocolGuid,
+                                  &mMmCommunication);
+
+CleanAllocatedPages:
+  gBS->FreePages (mNsCommBuffMemRegion.PhysicalBase,
+                  EFI_SIZE_TO_PAGES (mNsCommBuffMemRegion.Length));
+
+CleanAddedMemorySpace:
+  gDS->RemoveMemorySpace (mNsCommBuffMemRegion.PhysicalBase,
+                          mNsCommBuffMemRegion.Length);
+
+ReturnErrorStatus:
+  return EFI_INVALID_PARAMETER;
+}
diff --git a/ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.inf 
b/ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.inf
new file mode 100644
index 0000000000..344d55f333
--- /dev/null
+++ b/ArmPkg/Drivers/MmCommunicationDxe/MmCommunication.inf
@@ -0,0 +1,50 @@
+#/** @file
+#
+#  DXE MM Communicate driver
+#
+#  Copyright (c) 2016 - 2017, ARM Limited. All rights reserved.
+#
+#  This program and the accompanying materials
+#  are licensed and made available under the terms and conditions of the BSD 
License
+#  which accompanies this distribution.  The full text of the license may be 
found at
+#  http://opensource.org/licenses/bsd-license.php
+#
+#  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR 
IMPLIED.
+#
+#**/
+
+[Defines]
+  INF_VERSION                    = 0x0001001A
+  BASE_NAME                      = ArmMmCommunication
+  FILE_GUID                      = 09EE81D3-F15E-43F4-85B4-CB9873DA5D6B
+  MODULE_TYPE                    = DXE_RUNTIME_DRIVER
+  VERSION_STRING                 = 1.0
+
+  ENTRY_POINT                    = MmCommunicationInitialize
+
+[Sources.Common]
+  MmCommunication.c
+
+[Packages]
+  ArmPkg/ArmPkg.dec
+  MdePkg/MdePkg.dec
+
+[LibraryClasses]
+  ArmLib
+  ArmSmcLib
+  BaseMemoryLib
+  DebugLib
+  DxeServicesTableLib
+  HobLib
+  UefiDriverEntryPoint
+
+[Protocols]
+  gEfiMmCommunicationProtocolGuid              ## PRODUCES
+
+[Pcd.common]
+  gArmTokenSpaceGuid.PcdMmBufferBase
+  gArmTokenSpaceGuid.PcdMmBufferSize
+
+[Depex]
+  AFTER gArmGicDxeFileGuid
-- 
2.16.2

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