MdePkg: Add more DataBits support to Port80 output

The BasePostCodeLibPort80 instance just prints UINT8 to IoPort 80. Some boards
may support 16bit or 32bit. To support them, new PCD PcdPort80DataWidth is
introduced to specify the width of data bits to Port80.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Liming Gao <liming.gao@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18765 6f19259b-4bc3-4df7-8a09-765794883524

MdePkg/Library/BasePostCodeLibPort80/BasePostCodeLibPort80.inf

@@ -3,7 +3,7 @@
 #
 #  Post Code Library that writes post code values to I/O port 0x80.
 #
-#  Copyright (c) 2007 - 2014, Intel Corporation. All rights reserved.<BR>
+#  Copyright (c) 2007 - 2015, 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
@@ -40,8 +40,9 @@
 [LibraryClasses]
   IoLib
   PcdLib
+  DebugLib
 
 
 [Pcd]
   gEfiMdePkgTokenSpaceGuid.PcdPostCodePropertyMask  ## CONSUMES
-
+  gEfiMdePkgTokenSpaceGuid.PcdPort80DataWidth ## CONSUMES

MdePkg/Library/BasePostCodeLibPort80/PostCode.c

@@ -1,7 +1,7 @@
 /** @file
   Post Code Library instance that writes post code values to I/O port 0x80.
 
-  Copyright (c) 2006 - 2010, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2006 - 2015, 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        
@@ -17,6 +17,7 @@
 #include <Library/PostCodeLib.h>
 #include <Library/PcdLib.h>
 #include <Library/IoLib.h>
+#include <Library/DebugLib.h>
 
 /**
   Sends an 32-bit value to a POST card.
@@ -42,7 +43,24 @@ PostCode (
   IN UINT32  Value
   )
 {
-  IoWrite8 (0x80, (UINT8)(Value));
+  switch (PcdGet8 (PcdPort80DataWidth)) {
+  case 8:
+    IoWrite8 (0x80, (UINT8)(Value));
+    break;
+  case 16:
+    IoWrite16 (0x80, (UINT16)(Value));
+    break;
+  case 32:
+    IoWrite32 (0x80, Value);
+    break;
+  default:
+    //
+    // Assert on the invalid data width
+    //
+    ASSERT (FALSE);
+    break;
+  }
+  
   return Value;
 }
 
@@ -78,7 +96,7 @@ PostCodeWithDescription (
   IN CONST CHAR8  *Description  OPTIONAL
   )
 {
-  IoWrite8 (0x80, (UINT8)(Value));
+  PostCode (Value);
   return Value;
 }
 

MdePkg/MdePkg.dec

@@ -1938,6 +1938,11 @@
   # @Expression  0x80000002 | (gEfiMdePkgTokenSpaceGuid.PcdPostCodePropertyMask & 0xFC) == 0
   gEfiMdePkgTokenSpaceGuid.PcdPostCodePropertyMask|0|UINT8|0x0000000b
 
+  ## The bit width of data to be written to Port80. The default value is 8.
+  # @Prompt Port80 Data Width
+  # @ValidList  0x80000001 | 8, 16, 32
+  gEfiMdePkgTokenSpaceGuid.PcdPort80DataWidth|8|UINT8|0x0000002d
+
   ## This value is used to configure X86 Processor FSB clock.
   # @Prompt FSB Clock.
   gEfiMdePkgTokenSpaceGuid.PcdFSBClock|200000000|UINT32|0x0000000c