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

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

diff --git a/OldMdePkg/Library/BaseLib/Ia32/DisablePaging32.asm b/OldMdePkg/Library/BaseLib/Ia32/DisablePaging32.asm
new file mode 100644 (file)
index 0000000..d294977
--- /dev/null
+++ b/OldMdePkg/Library/BaseLib/Ia32/DisablePaging32.asm
@@ -0,0 +1,57 @@
+;------------------------------------------------------------------------------\r
+;\r
+; Copyright (c) 2006, Intel Corporation\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
+; Module Name:\r
+;\r
+;   DisablePaging32.Asm\r
+;\r
+; Abstract:\r
+;\r
+;   AsmDisablePaging32 function\r
+;\r
+; Notes:\r
+;\r
+;------------------------------------------------------------------------------\r
+\r
+    .386\r
+    .model  flat,C\r
+    .code\r
+\r
+;------------------------------------------------------------------------------\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
+InternalX86DisablePaging32    PROC\r
+    mov     ebx, [esp + 4]\r
+    mov     ecx, [esp + 8]\r
+    mov     edx, [esp + 12]\r
+    pushfd\r
+    pop     edi                         ; save EFLAGS to edi\r
+    cli\r
+    mov     eax, cr0\r
+    btr     eax, 31\r
+    mov     esp, [esp + 16]\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
+InternalX86DisablePaging32    ENDP\r
+\r
+    END\r