1 files changed, 57 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/ia32/DisablePaging32.asm b/MdePkg/Library/BaseLib/ia32/DisablePaging32.asm
new file mode 100644
index 0000000000..04ae8cf514
--- /dev/null
+++ b/MdePkg/Library/BaseLib/ia32/DisablePaging32.asm
@@ -0,0 +1,57 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, 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.
+;
+; Module Name:
+;
+;   DisablePaging32.Asm
+;
+; Abstract:
+;
+;   AsmDisablePaging32 function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    .386
+    .model  flat,C
+    .code
+
+;------------------------------------------------------------------------------
+; VOID
+; EFIAPI
+; InternalX86DisablePaging32 (
+;   IN      SWITCH_STACK_ENTRY_POINT  EntryPoint,
+;   IN      VOID                      *Context1,    OPTIONAL
+;   IN      VOID                      *Context2,    OPTIONAL
+;   IN      VOID                      *NewStack
+;   );
+;------------------------------------------------------------------------------
+InternalX86DisablePaging32    PROC
+    mov     ebx, [esp + 4]
+    mov     ecx, [esp + 8]
+    mov     edx, [esp + 12]
+    pushfd
+    pop     edi
+    cli
+    mov     eax, cr0
+    btr     eax, 31
+    mov     esp, [esp + 16]
+    mov     cr0, eax
+    push    edi
+    popfd
+    push    edx
+    push    ecx
+    call    ebx
+    jmp     $
+InternalX86DisablePaging32    ENDP
+
+    END