X-Git-Url: https://git.proxmox.com/?p=mirror_edk2.git;a=blobdiff_plain;f=OldMdePkg%2FLibrary%2FBaseLib%2FIa32%2FDisablePaging32.c;fp=OldMdePkg%2FLibrary%2FBaseLib%2FIa32%2FDisablePaging32.c;h=58597ce133cdb7aa8c7c42acc14b72af37b5b24a;hp=0000000000000000000000000000000000000000;hb=586cd1f1f4129ab7ec24543d4968801e17cc870b;hpb=144d783d40c8a02113350feabd1b9a55b692313f

diff --git a/OldMdePkg/Library/BaseLib/Ia32/DisablePaging32.c b/OldMdePkg/Library/BaseLib/Ia32/DisablePaging32.c
new file mode 100644
index 0000000000..58597ce133
--- /dev/null
+++ b/OldMdePkg/Library/BaseLib/Ia32/DisablePaging32.c
@@ -0,0 +1,46 @@
+/** @file
+  AsmDisablePaging32 function.
+
+  Copyright (c) 2006 - 2007, Intel Corporation<BR>
+  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.
+
+**/
+
+__declspec (naked)
+VOID
+EFIAPI
+InternalX86DisablePaging32 (
+  IN      SWITCH_STACK_ENTRY_POINT  EntryPoint,
+  IN      VOID                      *Context1,    OPTIONAL
+  IN      VOID                      *Context2,    OPTIONAL
+  IN      VOID                      *NewStack
+  )
+{
+  _asm {
+    push    ebp
+    mov     ebp, esp
+    mov     ebx, EntryPoint
+    mov     ecx, Context1
+    mov     edx, Context2
+    pushfd
+    pop     edi                         // save EFLAGS to edi
+    cli
+    mov     eax, cr0
+    btr     eax, 31
+    mov     esp, NewStack
+    mov     cr0, eax
+    push    edi
+    popfd                               // restore EFLAGS from edi
+    push    edx
+    push    ecx
+    call    ebx
+    jmp     $                           // EntryPoint() should not return
+  }
+}
+