[PATCH v3] SourceLevelDebugPkg: Use Pcd for the revision of transfer protocol

[Hao Wu <hao.a.wu@intel.com>]

V3 changes:
Add detailed description for the usage of the Pcd in package DEC file.
Update the comment for the introduced Pcd in module INF files.

V2 changes:
Instead of using a global variable, use a Pcd for transfer protocol
revision.

Previously, the revison of the debug agent transfer protocol is
reflected by a macro.

This commit introduces a Pcd to reflect the revision in order to avoid the
comparision of two macros, which will generate a constant result
detected by code checkers.

Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Hao Wu <hao.a.wu@intel.com>
---
 SourceLevelDebugPkg/Include/TransferProtocol.h                   | 3 +--
 .../Library/DebugAgent/DebugAgentCommon/DebugAgent.c             | 6 +++---
 SourceLevelDebugPkg/Library/DebugAgent/DxeDebugAgentLib.inf      | 1 +
 SourceLevelDebugPkg/Library/DebugAgent/SecPeiDebugAgentLib.inf   | 1 +
 SourceLevelDebugPkg/Library/DebugAgent/SmmDebugAgentLib.inf      | 1 +
 SourceLevelDebugPkg/SourceLevelDebugPkg.dec                      | 9 ++++++++-
 SourceLevelDebugPkg/SourceLevelDebugPkg.uni                      | 9 ++++++++-
 7 files changed, 23 insertions(+), 7 deletions(-)

diff --git a/SourceLevelDebugPkg/Include/TransferProtocol.h b/SourceLevelDebugPkg/Include/TransferProtocol.h
index ef7c891c39..5f9f35b5d7 100644
--- a/SourceLevelDebugPkg/Include/TransferProtocol.h
+++ b/SourceLevelDebugPkg/Include/TransferProtocol.h
@@ -2,7 +2,7 @@
   Transfer protocol defintions used by debug agent and host. It is only
   intended to be used by Debug related module implementation.
 
-  Copyright (c) 2010 - 2015, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2010 - 2017, Intel Corporation. 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
@@ -24,7 +24,6 @@
 //
 #define DEBUG_AGENT_REVISION_03         ((0 << 16) | 03)
 #define DEBUG_AGENT_REVISION_04         ((0 << 16) | 04)
-#define DEBUG_AGENT_REVISION            DEBUG_AGENT_REVISION_04
 #define DEBUG_AGENT_CAPABILITIES        0
 
 //
diff --git a/SourceLevelDebugPkg/Library/DebugAgent/DebugAgentCommon/DebugAgent.c b/SourceLevelDebugPkg/Library/DebugAgent/DebugAgentCommon/DebugAgent.c
index f156fe24db..36b1ef924c 100644
--- a/SourceLevelDebugPkg/Library/DebugAgent/DebugAgentCommon/DebugAgent.c
+++ b/SourceLevelDebugPkg/Library/DebugAgent/DebugAgentCommon/DebugAgent.c
@@ -1564,7 +1564,7 @@ ReadMemoryAndSendResponsePacket (
     // Compression/decompression support was added since revision 0.4.
     // Revision 0.3 shouldn't compress the packet.
     //
-    if (DEBUG_AGENT_REVISION >= DEBUG_AGENT_REVISION_04) {
+    if (PcdGet32(PcdTransferProtocolRevision) >= DEBUG_AGENT_REVISION_04) {
       //
       // Get the compressed data size without modifying the packet.
       //
@@ -1711,7 +1711,7 @@ AttachHost (
   }
   if (IncompatibilityFlag) {
     //
-    // If the incompatible Debug Packet received, the HOST should be running transfer protocol before DEBUG_AGENT_REVISION.
+    // If the incompatible Debug Packet received, the HOST should be running transfer protocol before PcdTransferProtocolRevision.
     // It could be UDK Debugger for Windows v1.1/v1.2 or for Linux v0.8/v1.2.
     //
     DebugPortWriteBuffer (Handle, (UINT8 *) mErrorMsgVersionAlert, AsciiStrLen (mErrorMsgVersionAlert));
@@ -2192,7 +2192,7 @@ CommandCommunication (
       break;
 
     case DEBUG_COMMAND_GET_REVISION:
-      DebugAgentRevision.Revision = DEBUG_AGENT_REVISION;
+      DebugAgentRevision.Revision = PcdGet32(PcdTransferProtocolRevision);
       DebugAgentRevision.Capabilities = DEBUG_AGENT_CAPABILITIES;
       Status = SendDataResponsePacket ((UINT8 *) &DebugAgentRevision, (UINT16) sizeof (DEBUG_DATA_RESPONSE_GET_REVISION), DebugHeader);
       break;
diff --git a/SourceLevelDebugPkg/Library/DebugAgent/DxeDebugAgentLib.inf b/SourceLevelDebugPkg/Library/DebugAgent/DxeDebugAgentLib.inf
index ce36345bab..7a2b4378a6 100644
--- a/SourceLevelDebugPkg/Library/DebugAgent/DxeDebugAgentLib.inf
+++ b/SourceLevelDebugPkg/Library/DebugAgent/DxeDebugAgentLib.inf
@@ -101,4 +101,5 @@
   gEfiMdePkgTokenSpaceGuid.PcdFSBClock                                  ## SOMETIMES_CONSUMES
   gEfiSourceLevelDebugPkgTokenSpaceGuid.PcdExceptionsIgnoredByDebugger  ## SOMETIMES_CONSUMES
   gEfiSourceLevelDebugPkgTokenSpaceGuid.PcdDebugPortHandleBufferSize    ## CONSUMES
+  gEfiSourceLevelDebugPkgTokenSpaceGuid.PcdTransferProtocolRevision     ## CONSUMES
 
diff --git a/SourceLevelDebugPkg/Library/DebugAgent/SecPeiDebugAgentLib.inf b/SourceLevelDebugPkg/Library/DebugAgent/SecPeiDebugAgentLib.inf
index 12c2a71b78..12534a298c 100644
--- a/SourceLevelDebugPkg/Library/DebugAgent/SecPeiDebugAgentLib.inf
+++ b/SourceLevelDebugPkg/Library/DebugAgent/SecPeiDebugAgentLib.inf
@@ -91,4 +91,5 @@
   gEfiMdePkgTokenSpaceGuid.PcdFSBClock                                  ## SOMETIMES_CONSUMES
   gEfiSourceLevelDebugPkgTokenSpaceGuid.PcdExceptionsIgnoredByDebugger  ## SOMETIMES_CONSUMES
   gEfiSourceLevelDebugPkgTokenSpaceGuid.PcdDebugPortHandleBufferSize    ## SOMETIMES_CONSUMES
+  gEfiSourceLevelDebugPkgTokenSpaceGuid.PcdTransferProtocolRevision     ## CONSUMES
 
diff --git a/SourceLevelDebugPkg/Library/DebugAgent/SmmDebugAgentLib.inf b/SourceLevelDebugPkg/Library/DebugAgent/SmmDebugAgentLib.inf
index 1fa5745b1c..580ae5bc80 100644
--- a/SourceLevelDebugPkg/Library/DebugAgent/SmmDebugAgentLib.inf
+++ b/SourceLevelDebugPkg/Library/DebugAgent/SmmDebugAgentLib.inf
@@ -86,4 +86,5 @@
   gEfiMdePkgTokenSpaceGuid.PcdFSBClock                                             ## SOMETIMES_CONSUMES
   # Skip Page Fault exception (14) by default in SMM
   gEfiSourceLevelDebugPkgTokenSpaceGuid.PcdExceptionsIgnoredByDebugger|0x00004000  ## SOMETIMES_CONSUMES
+  gEfiSourceLevelDebugPkgTokenSpaceGuid.PcdTransferProtocolRevision                ## CONSUMES
 
diff --git a/SourceLevelDebugPkg/SourceLevelDebugPkg.dec b/SourceLevelDebugPkg/SourceLevelDebugPkg.dec
index 9579c3e006..c9a47f6255 100644
--- a/SourceLevelDebugPkg/SourceLevelDebugPkg.dec
+++ b/SourceLevelDebugPkg/SourceLevelDebugPkg.dec
@@ -6,7 +6,7 @@
 # and host, PeCoffExtraActionLib instance to report symbol path information,
 # etc.
 #
-# Copyright (c) 2010 - 2015, Intel Corporation. All rights reserved.<BR>
+# Copyright (c) 2010 - 2017, Intel Corporation. All rights reserved.<BR>
 # This program and the accompanying materials are licensed and made available under 
 # the terms and conditions of the BSD License that accompanies this distribution.  
 # The full text of the license may be found at
@@ -112,5 +112,12 @@
   # @Prompt Configure debug device detection timeout value.
   gEfiSourceLevelDebugPkgTokenSpaceGuid.PcdUsbXhciDebugDetectTimeout|3000000|UINT64|0x00000009
 
+  ## Default revision of the debug agent transfer protocol.
+  #  The upper 16 bits indicate the major revision and the lower 16 bits indicate the minor revision.
+  #  For example, a value of 0x00000004 stands for revision 0.4.
+  #  Debug packet compression and decompression is supported since revision 0.4.
+  # @Prompt Default revision of the debug agent transfer protocol.
+  gEfiSourceLevelDebugPkgTokenSpaceGuid.PcdTransferProtocolRevision|0x00000004|UINT32|0x0000000a
+
 [UserExtensions.TianoCore."ExtraFiles"]
   SourceLevelDebugPkgExtra.uni
diff --git a/SourceLevelDebugPkg/SourceLevelDebugPkg.uni b/SourceLevelDebugPkg/SourceLevelDebugPkg.uni
index 533dafbfc8..781b717e4e 100644
--- a/SourceLevelDebugPkg/SourceLevelDebugPkg.uni
+++ b/SourceLevelDebugPkg/SourceLevelDebugPkg.uni
@@ -8,7 +8,7 @@
 // and host, PeCoffExtraActionLib instance to report symbol path information,
 // etc.
 //
-// Copyright (c) 2010 - 2015, Intel Corporation. All rights reserved.<BR>
+// Copyright (c) 2010 - 2017, Intel Corporation. All rights reserved.<BR>
 //
 // This program and the accompanying materials are licensed and made available under
 // the terms and conditions of the BSD License that accompanies this distribution.
@@ -91,3 +91,10 @@
 #string STR_gEfiSourceLevelDebugPkgTokenSpaceGuid_PcdUsbXhciDebugDetectTimeout_HELP  #language en-US "Per XHCI spec, software shall impose a timeout between the detection of the Debug Host\n"
                                                                                                      "connection and the DbC Run transition to 1. This PCD specifies the timeout value in microsecond."
 
+#string STR_gEfiSourceLevelDebugPkgTokenSpaceGuid_PcdTransferProtocolRevision_PROMPT  #language en-US "Default revision of the debug agent transfer protocol."
+
+#string STR_gEfiSourceLevelDebugPkgTokenSpaceGuid_PcdTransferProtocolRevision_HELP  #language en-US "The upper 16 bits indicate the major revision and the lower 16 bits indicate\n"
+                                                                                                    "the minor revision.\n"
+                                                                                                    "For example, a value of 0x00000004 stands for revision 0.4.\n"
+                                                                                                    "Debug packet compression and decompression is supported since revision 0.4."
+
-- 
2.12.0.windows.1