1 files changed, 89 insertions, 0 deletions
diff --git a/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/Ipf/IpfThunk.i b/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/Ipf/IpfThunk.i
new file mode 100644
index 0000000000..441bb25e3d
--- /dev/null
+++ b/IntelFrameworkModulePkg/Csm/LegacyBiosDxe/Ipf/IpfThunk.i
@@ -0,0 +1,89 @@
+//// @file
+//
+// Copyright (c) 2006, 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.
+//
+////
+
+#define NUM_REAL_GDT_ENTRIES						3
+#define LOW_STACK_SIZE								(8*1024)            // 8k?
+
+//
+// Low memory Thunk Structure
+//
+#define		Code									0
+#define		LowReverseThunkStart					Code + 4096
+#define		GdtDesc									LowReverseThunkStart + 4
+#define		IdtDesc					 				GdtDesc + 6
+#define		FlatSs					 				IdtDesc + 6
+#define		FlatEsp					 				FlatSs + 4
+#define		LowCodeSelector			 				FlatEsp + 4
+#define		LowDataSelector			 				LowCodeSelector + 4
+#define		LowStack			 					LowDataSelector + 4
+#define		RealModeIdtDesc			 				LowStack + 4
+#define		RealModeGdt								RealModeIdtDesc + 6
+#define		RealModeGdtDesc							RealModeGdt + (8 * NUM_REAL_GDT_ENTRIES)
+#define		RevRealDs								RealModeGdtDesc + 6
+#define		RevRealSs								RevRealDs + 2
+#define		RevRealEsp								RevRealSs + 2
+#define		RevRealIdtDesc							RevRealEsp + 4
+#define		RevFlatDataSelector						RevRealIdtDesc + 6
+#define		RevFlatStack							RevFlatDataSelector + 2
+#define		Stack									RevFlatStack + 4
+#define		RevThunkStack							Stack + LOW_STACK_SIZE
+
+#define		EfiToLegacy16InitTable					RevThunkStack + LOW_STACK_SIZE
+#define		InitTableBiosLessThan1MB				EfiToLegacy16InitTable
+#define		InitTableHiPmmMemory					InitTableBiosLessThan1MB + 4
+#define		InitTablePmmMemorySizeInBytes			InitTableHiPmmMemory + 4
+#define		InitTableReverseThunkCallSegment		InitTablePmmMemorySizeInBytes + 4
+#define		InitTableReverseThunkCallOffset			InitTableReverseThunkCallSegment + 2
+#define		InitTableNumberE820Entries				InitTableReverseThunkCallOffset + 2
+#define		InitTableOsMemoryAbove1Mb				InitTableNumberE820Entries + 4
+#define		InitTableThunkStart						InitTableOsMemoryAbove1Mb + 4
+#define		InitTableThunkSizeInBytes				InitTableThunkStart + 4
+#define		InitTable16InitTableEnd					InitTableThunkSizeInBytes + 4
+
+#define		EfiToLegacy16BootTable					InitTable16InitTableEnd
+#define		BootTableBiosLessThan1MB				EfiToLegacy16BootTable
+#define		BootTableHiPmmMemory					BootTableBiosLessThan1MB + 4
+#define		BootTablePmmMemorySizeInBytes			BootTableHiPmmMemory + 4
+#define		BootTableReverseThunkCallSegment		BootTablePmmMemorySizeInBytes + 4
+#define		BootTableReverseThunkCallOffset			BootTableReverseThunkCallSegment + 2
+#define		BootTableNumberE820Entries				BootTableReverseThunkCallOffset + 2
+#define		BootTableOsMemoryAbove1Mb				BootTableNumberE820Entries + 4
+#define		BootTableThunkStart						BootTableOsMemoryAbove1Mb + 4
+#define		BootTableThunkSizeInBytes				BootTableThunkStart + 4
+#define		EfiToLegacy16BootTableEnd				BootTableThunkSizeInBytes + 4
+
+#define		InterruptRedirectionCode				EfiToLegacy16BootTableEnd
+#define		PciHandler								InterruptRedirectionCode + 32
+
+
+//
+// Register Sets (16 Bit)
+//
+
+#define		AX		0
+#define		BX		2
+#define		CX		4
+#define		DX		6
+#define		SI		8
+#define		DI		10
+#define		Flags	12
+#define		ES		14
+#define		CS		16
+#define		SS		18
+#define		DS		20
+#define		BP		22
+
+
+