[PATCH v2 3/5] MdePkg: EFI_MM_COMUNICATION2_PROTOCOL

["Oleksiy Yakovlev" <oleksiyy@ami.com>]

From: Robert Phelps <robert@ami.com>

Created a new header to support the new EFI_MM_COMMUNICATION2_PROTOCOL
Protocol  as defined in the PI 1.7a Specification
(PI 1.7a Mantis 1993)

Signed-off-by: Robert Phelps <robert@ami.com>
Reviewed-by: Zhiguang Liu <zhiguang.liu@intel.com>
---
 MdePkg/Include/Protocol/MmCommunication2.h | 72 ++++++++++++++++++++++
 MdePkg/MdePkg.dec                          |  7 +++
 2 files changed, 79 insertions(+)
 create mode 100644 MdePkg/Include/Protocol/MmCommunication2.h

diff --git a/MdePkg/Include/Protocol/MmCommunication2.h b/MdePkg/Include/Protocol/MmCommunication2.h
new file mode 100644
index 0000000000..2d1f44f309
--- /dev/null
+++ b/MdePkg/Include/Protocol/MmCommunication2.h
@@ -0,0 +1,72 @@
+/** @file
+    EFI MM Communication Protocol 2 as defined in the PI 1.7 errata A specification.
+
+    Provides a runtime service for communicating between DXE drivers and a registered MMI handler
+
+Copyright (c) 2020, American Megatrends International LLC. All rights reserved.
+SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+#ifndef _MM_COMMUNICATION2_H_
+#define _MM_COMMUNICATION2_H_
+
+///
+/// Global ID for EFI_MM_COMUNICATION@_PROTOCOL_GUID
+///
+#define EFI_MM_COMMUNICATION2_PROTOCOL_GUID \
+        { 0x378daedc, 0xf06b, 0x4446, { 0x83, 0x14, 0x40, 0xab, 0x93, 0x3c, 0x87, 0xa3 }}
+
+
+///
+/// The forward declaration for EFI_MM_COMMUNICATION2_PROTOCOL_GUID
+///
+typedef struct _EFI_MM_COMMUNICATION2_PROTOCOL EFI_MM_COMMUNICATION2_PROTOCOL;
+
+
+/**
+ Communicates with a registered handler.
+
+    Usage is identical to EFI_MM_COMMUNICATION_PROTOCOL.Communicate() except for the notes below:
+    - Instead of passing just the physical address via the CommBuffer parameter, the caller must pass both the physical and the virtual addresses of the communication buffer.
+    - If no virtual remapping has taken place, the physical address will be equal to the virtual address, and so the caller is required to pass the same value for both parameters.
+
+    @param This                 The EFI_MM_COMMUNICATION2_PROTOCOL instance.
+    @param CommBufferPhysical   Physical address of the buffer to convey into MMRAM.
+    @param CommBufferVirtual    Virtual address of the buffer to convey into MMRAM.
+    @param CommSize             The size of the data buffer being passed in. On exit, the
+                                size of data being returned. Zero if the handler does not
+                                wish to reply with any data. This parameter is optional and may be NULL.
+
+
+    @retval EFI_SUCCESS             The message was successfully posted.
+    @retval EFI_INVALID_PARAMETER   The CommBuffer** parameters do not refer to the same location in memory.
+    @retval EFI_BAD_BUFFER_SIZE     The buffer is too large 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.
+**/
+
+typedef
+EFI_STATUS
+(EFIAPI *EFI_MM_COMMUNICATE2)(
+IN CONST EFI_MM_COMMUNICATION2_PROTOCOL     *This,
+IN OUT VOID                                 *CommBufferPhysical,
+IN OUT VOID                                 *CommBufferVirtual,
+IN OUT UINTN                                *CommSize OPTIONAL
+);
+
+
+/// This protocol provides a means of communicating between drivers outside
+/// of MM and MMI handlers inside of MM, in a way that hides the implementation
+/// details regarding whether traditional or standalone MM is being used.
+
+typedef struct _EFI_MM_COMMUNICATION2_PROTOCOL {
+EFI_MM_COMMUNICATE2        Communicate;
+} EFI_MM_COMMUNICATION2_PROTOCOL;
+
+
+#endif
diff --git a/MdePkg/MdePkg.dec b/MdePkg/MdePkg.dec
index 0b9c4bc40a..2591b8e135 100644
--- a/MdePkg/MdePkg.dec
+++ b/MdePkg/MdePkg.dec
@@ -1280,6 +1280,13 @@
   ## Include/Protocol/SpiSmmNorFlash.h
   gEfiSpiSmmNorFlashProtocolGuid         = { 0xaab18f19, 0xfe14, 0x4666, { 0x86, 0x04, 0x87, 0xff, 0x6d, 0x66, 0x2c, 0x9a }}
 
+  #
+  # Protocols defined in PI 1.7
+  #
+
+  ## Include/Protocol/MmComunication2.h
+  gEfiMmCommunication2ProtocolGuid       = { 0x378daedc, 0xf06b, 0x4446, { 0x83, 0x14, 0x40, 0xab, 0x93, 0x3c, 0x87, 0xa3 }}
+
   #
   # Protocols defined in UEFI2.1/UEFI2.0/EFI1.1
   #
-- 
2.24.1.windows.2


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