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| author | Kun Qin <kun.q@outlook.com> | 2021-03-04 20:12:47 -0800 |
|---|---|---|
| committer | mergify[bot] <37929162+mergify[bot]@users.noreply.github.com> | 2021-03-05 15:25:07 +0000 |
| commit | 7cda5d9e3a4b6e5258d128220a329334d5510fc4 (patch) | |
| tree | 7059de7a1ba20dce248fcdbe9e65b151f603febf /MdePkg/Library/MmUnblockMemoryLib/MmUnblockMemoryLibNull.inf | |
| parent | c5740f360636479fb91681093b1dee1cc366075c (diff) | |
| download | edk2-7cda5d9e3a4b6e5258d128220a329334d5510fc4.tar.gz edk2-7cda5d9e3a4b6e5258d128220a329334d5510fc4.tar.bz2 edk2-7cda5d9e3a4b6e5258d128220a329334d5510fc4.zip | |
MdePkg: MmUnblockMemoryLib: Added definition and null instance
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3168
This interface provides an abstration layer to allow MM modules to access
requested areas that are outside of MMRAM. On MM model that blocks all
non-MMRAM accesses, areas requested through this API will be mapped or
unblocked for accessibility inside MM environment.
For MM modules that need to access regions outside of MMRAMs, the agents
that set up these regions are responsible for invoking this API in order
for these memory areas to be accessible from inside MM.
Example usages:
1. To enable runtime cache feature for variable service, Variable MM
module will need to access the allocated runtime buffer. Thus the agent
sets up these buffers, VariableSmmRuntimeDxe, will need to invoke this
API to make these regions accessible by Variable MM.
2. For TPM ACPI table to communicate to physical presence handler, the
corresponding NVS region has to be accessible from inside MM. Once the
NVS region are assigned, it needs to be unblocked thourgh this API.
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Zhiguang Liu <zhiguang.liu@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Kun Qin <kun.q@outlook.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
Message-Id: <MWHPR06MB31028AF0D0785B93E4E7CF63F3969@MWHPR06MB3102.namprd06.prod.outlook.com>
Diffstat (limited to 'MdePkg/Library/MmUnblockMemoryLib/MmUnblockMemoryLibNull.inf')
| -rw-r--r-- | MdePkg/Library/MmUnblockMemoryLib/MmUnblockMemoryLibNull.inf | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/MdePkg/Library/MmUnblockMemoryLib/MmUnblockMemoryLibNull.inf b/MdePkg/Library/MmUnblockMemoryLib/MmUnblockMemoryLibNull.inf new file mode 100644 index 0000000000..8ecb767ff7 --- /dev/null +++ b/MdePkg/Library/MmUnblockMemoryLib/MmUnblockMemoryLibNull.inf @@ -0,0 +1,34 @@ +## @file
+# Null instance of MM Unblock Page Library.
+#
+# This library provides an interface to request non-MMRAM pages to be mapped/unblocked
+# from inside MM environment.
+#
+# For MM modules that need to access regions outside of MMRAMs, the agents that set up
+# these regions are responsible for invoking this API in order for these memory areas
+# to be accessed from inside MM.
+#
+# Copyright (c) Microsoft Corporation.
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+#
+##
+
+[Defines]
+ INF_VERSION = 0x0001001B
+ BASE_NAME = MmUnblockMemoryLibNull
+ MODULE_UNI_FILE = MmUnblockMemoryLibNull.uni
+ FILE_GUID = 9E890F68-5C95-4C31-95DD-59E6286F85EA
+ MODULE_TYPE = BASE
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = MmUnblockMemoryLib
+
+#
+# VALID_ARCHITECTURES = IA32 X64
+#
+
+[Sources]
+ MmUnblockMemoryLibNull.c
+
+[Packages]
+ MdePkg/MdePkg.dec
|