1 files changed, 64 insertions, 0 deletions
diff --git a/OvmfPkg/Csm/LegacyBiosDxe/X64/InterruptTable.nasm b/OvmfPkg/Csm/LegacyBiosDxe/X64/InterruptTable.nasm
new file mode 100644
index 0000000000..afc2f0e639
--- /dev/null
+++ b/OvmfPkg/Csm/LegacyBiosDxe/X64/InterruptTable.nasm
@@ -0,0 +1,64 @@
+;; @file
+;  Interrupt Redirection Template
+;
+; Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
+;
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+;;
+
+    DEFAULT REL
+    SECTION .text
+
+;----------------------------------------------------------------------------
+; Procedure:    InterruptRedirectionTemplate: Redirects interrupts 0x68-0x6F
+;
+; Input:        None
+;
+; Output:       None
+;
+; Prototype:    VOID
+;               InterruptRedirectionTemplate (
+;                                VOID
+;                                );
+;
+; Saves:        None
+;
+; Modified:     None
+;
+; Description:  Contains the code that is copied into low memory (below 640K).
+;               This code reflects interrupts 0x68-0x6f to interrupts 0x08-0x0f.
+;               This template must be copied into low memory, and the IDT entries
+;               0x68-0x6F must be point to the low memory copy of this code.  Each
+;               entry is 4 bytes long, so IDT entries 0x68-0x6F can be easily
+;               computed.
+;
+;----------------------------------------------------------------------------
+
+global ASM_PFX(InterruptRedirectionTemplate)
+ASM_PFX(InterruptRedirectionTemplate):
+  int     0x8
+  DB      0xcf          ; IRET
+  nop
+  int     0x9
+  DB      0xcf          ; IRET
+  nop
+  int     0xa
+  DB      0xcf          ; IRET
+  nop
+  int     0xb
+  DB      0xcf          ; IRET
+  nop
+  int     0xc
+  DB      0xcf          ; IRET
+  nop
+  int     0xd
+  DB      0xcf          ; IRET
+  nop
+  int     0xe
+  DB      0xcf          ; IRET
+  nop
+  int     0xf
+  DB      0xcf          ; IRET
+  nop
+