Moved the MdePkg to OldMdePkg so that new code in MdePkg does not break existing...

[mirror_edk2.git] / OldMdePkg / Library / BaseLib / Ia32 / DisablePaging32.c

diff --git a/OldMdePkg/Library/BaseLib/Ia32/DisablePaging32.c b/OldMdePkg/Library/BaseLib/Ia32/DisablePaging32.c
new file mode 100644 (file)
index 0000000..58597ce
--- /dev/null
+++ b/OldMdePkg/Library/BaseLib/Ia32/DisablePaging32.c
@@ -0,0 +1,46 @@
+/** @file\r
+  AsmDisablePaging32 function.\r
+\r
+  Copyright (c) 2006 - 2007, Intel Corporation<BR>\r
+  All rights reserved. This program and the accompanying materials\r
+  are licensed and made available under the terms and conditions of the BSD License\r
+  which accompanies this distribution.  The full text of the license may be found at\r
+  http://opensource.org/licenses/bsd-license.php\r
+\r
+  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
+  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
+\r
+**/\r
+\r
+__declspec (naked)\r
+VOID\r
+EFIAPI\r
+InternalX86DisablePaging32 (\r
+  IN      SWITCH_STACK_ENTRY_POINT  EntryPoint,\r
+  IN      VOID                      *Context1,    OPTIONAL\r
+  IN      VOID                      *Context2,    OPTIONAL\r
+  IN      VOID                      *NewStack\r
+  )\r
+{\r
+  _asm {\r
+    push    ebp\r
+    mov     ebp, esp\r
+    mov     ebx, EntryPoint\r
+    mov     ecx, Context1\r
+    mov     edx, Context2\r
+    pushfd\r
+    pop     edi                         // save EFLAGS to edi\r
+    cli\r
+    mov     eax, cr0\r
+    btr     eax, 31\r
+    mov     esp, NewStack\r
+    mov     cr0, eax\r
+    push    edi\r
+    popfd                               // restore EFLAGS from edi\r
+    push    edx\r
+    push    ecx\r
+    call    ebx\r
+    jmp     $                           // EntryPoint() should not return\r
+  }\r
+}\r
+\r