1 files changed, 51 insertions, 0 deletions
diff --git a/UefiCpuPkg/CpuDxe/Ia32/IvtAsm.asm b/UefiCpuPkg/CpuDxe/Ia32/IvtAsm.asm
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index 0000000000..e5dfaace8c
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+++ b/UefiCpuPkg/CpuDxe/Ia32/IvtAsm.asm
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+      TITLE   IvtAsm.asm:
+;------------------------------------------------------------------------------
+;*
+;*   Copyright 2008 - 2009, Intel Corporation
+;*   All rights reserved. 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.
+;*
+;*    IvtAsm.asm
+;*
+;*   Abstract:
+;*
+;------------------------------------------------------------------------------
+
+#include <Base.h>
+
+#ifdef MDE_CPU_IA32
+    .686
+    .model  flat,C
+#endif
+    .code
+
+;------------------------------------------------------------------------------
+;  Generic IDT Vector Handlers for the Host. They are all the same so they
+;  will compress really well.
+;
+;  By knowing the return address for Vector 00 you can can calculate the
+;  vector number by looking at the call CommonInterruptEntry return address.
+;  (return address - (AsmIdtVector00 + 5))/8 == IDT index
+;
+;------------------------------------------------------------------------------
+
+EXTRN CommonInterruptEntry:PROC
+
+ALIGN   8
+
+PUBLIC	AsmIdtVector00
+
+AsmIdtVector00 LABEL BYTE
+REPEAT  256
+    call    CommonInterruptEntry
+    dw      ($ - AsmIdtVector00 - 5) / 8 ; vector number
+    nop
+ENDM
+
+END
+