REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2798
The services in CpuLib usually generate exceptions in a unit test
host application. Provide a Null instance that can be safely used.
This Null instance can also be used as a template for implementing
new instances of CpuLib.
Cc: Liming Gao <liming....@intel.com>
Cc: Sean Brogan <sean.bro...@microsoft.com>
Cc: Bret Barkelew <bret.barke...@microsoft.com>
Cc: Jiewen Yao <jiewen....@intel.com>
Signed-off-by: Michael D Kinney <michael.d.kin...@intel.com>
Reviewed-by: Liming Gao <liming....@intel.com>
Reviewed-by: Sean Brogan <sean.bro...@microsoft.com>
---
.../Library/BaseCpuLibNull/BaseCpuLibNull.c | 37 +++++++++++++++++++
.../Library/BaseCpuLibNull/BaseCpuLibNull.inf | 26 +++++++++++++
.../Library/BaseCpuLibNull/BaseCpuLibNull.uni | 11 ++++++
MdePkg/MdePkg.dsc | 3 +-
4 files changed, 76 insertions(+), 1 deletion(-)
create mode 100644 MdePkg/Library/BaseCpuLibNull/BaseCpuLibNull.c
create mode 100644 MdePkg/Library/BaseCpuLibNull/BaseCpuLibNull.inf
create mode 100644 MdePkg/Library/BaseCpuLibNull/BaseCpuLibNull.uni
diff --git a/MdePkg/Library/BaseCpuLibNull/BaseCpuLibNull.c
b/MdePkg/Library/BaseCpuLibNull/BaseCpuLibNull.c
new file mode 100644
index 0000000000..3ba7a35096
--- /dev/null
+++ b/MdePkg/Library/BaseCpuLibNull/BaseCpuLibNull.c
@@ -0,0 +1,37 @@
+/** @file
+ Null instance of CPU Library.
+
+ Copyright (c) 2020, Intel Corporation. All rights reserved.<BR>
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+**/
+
+/**
+ Places the CPU in a sleep state until an interrupt is received.
+
+ Places the CPU in a sleep state until an interrupt is received. If interrupts
+ are disabled prior to calling this function, then the CPU will be placed in a
+ sleep state indefinitely.
+
+**/
+VOID
+EFIAPI
+CpuSleep (
+ VOID
+ )
+{
+}
+
+/**
+ Flushes all the Translation Lookaside Buffers(TLB) entries in a CPU.
+
+ Flushes all the Translation Lookaside Buffers(TLB) entries in a CPU.
+
+**/
+VOID
+EFIAPI
+CpuFlushTlb (
+ VOID
+ )
+{
+}
diff --git a/MdePkg/Library/BaseCpuLibNull/BaseCpuLibNull.inf
b/MdePkg/Library/BaseCpuLibNull/BaseCpuLibNull.inf
new file mode 100644
index 0000000000..a9e8399038
--- /dev/null
+++ b/MdePkg/Library/BaseCpuLibNull/BaseCpuLibNull.inf
@@ -0,0 +1,26 @@
+## @file
+# Null instance of CPU Library.
+#
+# Copyright (c) 2020, Intel Corporation. All rights reserved.<BR>
+# SPDX-License-Identifier: BSD-2-Clause-Patent
+#
+##
+
+[Defines]
+ INF_VERSION = 0x00010005
+ BASE_NAME = BaseCpuLibNull
+ MODULE_UNI_FILE = BaseCpuLibNull.uni
+ FILE_GUID = 8A29AAA5-0FB7-44CC-8709-1344FE89B878
+ MODULE_TYPE = BASE
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = CpuLib
+
+#
+# VALID_ARCHITECTURES = IA32 X64 EBC ARM AARCH64 RISCV64
+#
+
+[Sources]
+ BaseCpuLibNull.c
+
+[Packages]
+ MdePkg/MdePkg.dec
diff --git a/MdePkg/Library/BaseCpuLibNull/BaseCpuLibNull.uni
b/MdePkg/Library/BaseCpuLibNull/BaseCpuLibNull.uni
new file mode 100644
index 0000000000..1030221d5c
--- /dev/null
+++ b/MdePkg/Library/BaseCpuLibNull/BaseCpuLibNull.uni
@@ -0,0 +1,11 @@
+// /** @file
+// Null instance of CPU Library.
+//
+// Copyright (c) 2020, Intel Corporation. All rights reserved.<BR>
+// SPDX-License-Identifier: BSD-2-Clause-Patent
+//
+// **/
+
+#string STR_MODULE_ABSTRACT #language en-US "Null Instance of CPU
Library"
+
+#string STR_MODULE_DESCRIPTION #language en-US "Null instance of CPU
Library."
diff --git a/MdePkg/MdePkg.dsc b/MdePkg/MdePkg.dsc
index 6cd38e7ec3..3abe65ec7f 100644
--- a/MdePkg/MdePkg.dsc
+++ b/MdePkg/MdePkg.dsc
@@ -1,7 +1,7 @@
## @file
# EFI/PI MdePkg Package
#
-# Copyright (c) 2007 - 2018, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2007 - 2020, Intel Corporation. All rights reserved.<BR>
# Portions copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
# (C) Copyright 2020 Hewlett Packard Enterprise Development LP<BR>
#
@@ -36,6 +36,7 @@ [Components]
MdePkg/Library/UefiFileHandleLib/UefiFileHandleLib.inf
MdePkg/Library/BaseCacheMaintenanceLib/BaseCacheMaintenanceLib.inf
MdePkg/Library/BaseCpuLib/BaseCpuLib.inf
+ MdePkg/Library/BaseCpuLibNull/BaseCpuLibNull.inf
MdePkg/Library/BaseDebugLibNull/BaseDebugLibNull.inf
MdePkg/Library/BaseDebugLibSerialPort/BaseDebugLibSerialPort.inf
MdePkg/Library/BaseDebugPrintErrorLevelLib/BaseDebugPrintErrorLevelLib.inf
--
2.21.0.windows.1
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