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+## @file
+# Abstraction library for calls to EFI_MM_COMMUNICATE_PROTOCOL::Communicate
+#
+# Copyright (c) 2019, Linaro Ltd. All rights reserved.<BR>
+#
+# 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 = 0x0001001B
+ BASE_NAME = RuntimeDxeMmCommunicateLib
+ MODULE_UNI_FILE = RuntimeDxeMmCommunicateLib.uni
+ FILE_GUID = 15cd7ca8-ca1a-43a2-8f9c-eabbd3e7e5b5
+ MODULE_TYPE = DXE_RUNTIME_DRIVER
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = MmCommunicateLib|DXE_RUNTIME_DRIVER
+ CONSTRUCTOR = RuntimeDxeMmCommunicateLibConstructor
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+# VALID_ARCHITECTURES = ARM AARCH64 IA32 X64
+#
+
+[Sources]
+ RuntimeDxeMmCommunicateLib.c
+
+[Packages]
+ MdePkg/MdePkg.dec
+ MdeModulePkg/MdeModulePkg.dec
+
+[LibraryClasses]
+ DebugLib
+ UefiBootServicesTableLib
+ UefiRuntimeLib
+
+[Guids]
+ gEfiEventVirtualAddressChangeGuid ## CONSUMES ## Event
+
+[Protocols]
+ gEfiMmCommunicationProtocolGuid ## CONSUMES
+
+[Depex]
+ gEfiMmCommunicationProtocolGuid
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+/** @file
+ Abstraction library for calls to EFI_MM_COMMUNICATE_PROTOCOL::Communicate
+
+ Copyright (c) 2019, Linaro Ltd. All rights reserved.<BR>
+
+ 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 <PiDxe.h>
+
+#include <Library/DebugLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiRuntimeLib.h>
+
+#include <Protocol/MmCommunication.h>
+
+STATIC EFI_MM_COMMUNICATION_PROTOCOL *mMmCommunication;
+STATIC EFI_EVENT mVirtualAddressChangeEvent;
+
+/**
+ Invoke the MM communication protocol
+
+ @param[in] CommBuffer A pointer to the buffer to convey into MMRAM.
+ @param[in] 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 was NULL.
+ @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(s) or CommSize
+ parameter, if not omitted, are in address range
+ that cannot be accessed by the MM environment.
+
+**/
+EFI_STATUS
+EFIAPI
+MmCommunicate (
+ IN OUT VOID *PhysicalCommBuffer,
+ IN OUT VOID *VirtualCommBuffer,
+ IN OUT UINTN *CommSize OPTIONAL
+ )
+{
+ ASSERT (EfiAtRuntime () || (PhysicalCommBuffer == VirtualCommBuffer));
+
+ return mMmCommunication->Communicate (mMmCommunication, VirtualCommBuffer,
+ CommSize);
+}
+
+/**
+ Notification function of EVT_SIGNAL_VIRTUAL_ADDRESS_CHANGE.
+
+ @param[in] Event Event whose notification function is being invoked.
+ @param[in] Context Pointer to the notification function's context.
+
+**/
+STATIC
+VOID
+EFIAPI
+VariableAddressChangeEvent (
+ IN EFI_EVENT Event,
+ IN VOID *Context
+ )
+{
+ EfiConvertPointer (0x0, (VOID **)&mMmCommunication);
+}
+
+/**
+ Library entry point
+
+ @param[in] ImageHandle The firmware allocated handle for the EFI image.
+ @param[in] SystemTable A pointer to the EFI System Table.
+
+ @retval EFI_SUCCESS Library successfully initialized.
+
+**/
+EFI_STATUS
+EFIAPI
+RuntimeDxeMmCommunicateLibConstructor (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ EFI_STATUS Status;
+
+ Status = gBS->LocateProtocol (&gEfiMmCommunicationProtocolGuid, NULL,
+ (VOID **)&mMmCommunication);
+ ASSERT_EFI_ERROR (Status);
+
+ //
+ // Register the event to convert the pointer for runtime.
+ //
+ Status = gBS->CreateEventEx (EVT_NOTIFY_SIGNAL, TPL_NOTIFY,
+ VariableAddressChangeEvent, NULL,
+ &gEfiEventVirtualAddressChangeGuid,
+ &mVirtualAddressChangeEvent);
+ ASSERT_EFI_ERROR (Status);
+
+ return EFI_SUCCESS;
+}
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+///** @file
+// Abstraction library for calls to EFI_MM_COMMUNICATE_PROTOCOL::Communicate
+//
+// Copyright (c) 2019, Linaro Ltd. All rights reserved.<BR>
+//
+// 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.
+//
+//**/
+
+
+#string STR_MODULE_ABSTRACT #language en-US "Abstraction library for calls to EFI_MM_COMMUNICATE_PROTOCOL::Communicate"
+
+#string STR_MODULE_DESCRIPTION #language en-US "Abstraction library for calls to EFI_MM_COMMUNICATE_PROTOCOL::Communicate."
+
Add an implementation of MmCommunicateLib based on standalone MM. This version passes the virtual address of the communication buffer into the MM communicate protocol method. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> --- StandaloneMmPkg/Library/RuntimeDxeMmCommunicateLib/RuntimeDxeMmCommunicateLib.inf | 51 +++++++++ StandaloneMmPkg/Library/RuntimeDxeMmCommunicateLib/RuntimeDxeMmCommunicateLib.c | 113 ++++++++++++++++++++ StandaloneMmPkg/Library/RuntimeDxeMmCommunicateLib/RuntimeDxeMmCommunicateLib.uni | 19 ++++ 3 files changed, 183 insertions(+) -- 2.20.1 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel