IntelFrameworkModulePkg: Add Compatibility Support Module (CSM) drivers

Added these drivers:
* LegacyBiosDxe
* BlockIoDxe
* KeyboardDxe
* Snp16Dxe
* VideoDxe

Signed-off-by: jljusten
Reviewed-by: mdkinney
Reviewed-by: geekboy15a

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@11905 6f19259b-4bc3-4df7-8a09-765794883524

IntelFrameworkModulePkg/Csm/LegacyBiosDxe/LegacyBda.c

@@ -0,0 +1,66 @@
+/** @file
+  This code fills in BDA (0x400) and EBDA (pointed to by 0x4xx)
+  information. There is support for doing initializeation before
+  Legacy16 is loaded and before a legacy boot is attempted.
+
+Copyright (c) 2006 - 2010, 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
+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 "LegacyBiosInterface.h"
+
+/**
+  Fill in the standard BDA and EBDA stuff before Legacy16 load
+
+  @param  Private     Legacy BIOS Instance data
+
+  @retval EFI_SUCCESS It should always work.
+
+**/
+EFI_STATUS
+LegacyBiosInitBda (
+  IN  LEGACY_BIOS_INSTANCE    *Private
+  )
+{
+  BDA_STRUC *Bda;
+  UINT8     *Ebda;
+
+  Bda   = (BDA_STRUC *) ((UINTN) 0x400);
+  Ebda  = (UINT8 *) ((UINTN) 0x9fc00);
+
+  ZeroMem (Bda, 0x100);
+  ZeroMem (Ebda, 0x400);
+  //
+  // 640k-1k for EBDA
+  //
+  Bda->MemSize        = 0x27f;
+  Bda->KeyHead        = 0x1e;
+  Bda->KeyTail        = 0x1e;
+  Bda->FloppyData     = 0x00;
+  Bda->FloppyTimeout  = 0xff;
+
+  Bda->KeyStart       = 0x001E;
+  Bda->KeyEnd         = 0x003E;
+  Bda->KeyboardStatus = 0x10;
+  Bda->Ebda           = 0x9fc0;
+
+  //
+  // Move LPT time out here and zero out LPT4 since some SCSI OPROMS
+  // use this as scratch pad (LPT4 is Reserved)
+  //
+  Bda->Lpt1_2Timeout  = 0x1414;
+  Bda->Lpt3_4Timeout  = 0x1400;
+
+  *Ebda               = 0x01;
+
+  return EFI_SUCCESS;
+}