2 AsmDisablePaging32 function.
4 Copyright (c) 2006 - 2007, Intel Corporation<BR>
5 All rights reserved. This program and the accompanying materials
6 are licensed and made available under the terms and conditions of the BSD License
7 which accompanies this distribution. The full text of the license may be found at
8 http://opensource.org/licenses/bsd-license.php
10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
16 // Include common header file for this module.
18 #include <BaseLibInternals.h>
23 Disables the 32-bit paging mode on the CPU.
25 Disables the 32-bit paging mode on the CPU and returns to 32-bit protected
26 mode. This function assumes the current execution mode is 32-paged protected
27 mode. This function is only available on IA-32. After the 32-bit paging mode
28 is disabled, control is transferred to the function specified by EntryPoint
29 using the new stack specified by NewStack and passing in the parameters
30 specified by Context1 and Context2. Context1 and Context2 are optional and
31 may be NULL. The function EntryPoint must never return.
33 There are a number of constraints that must be followed before calling this
35 1) Interrupts must be disabled.
36 2) The caller must be in 32-bit paged mode.
37 3) CR0, CR3, and CR4 must be compatible with 32-bit paged mode.
38 4) CR3 must point to valid page tables that guarantee that the pages for
39 this function and the stack are identity mapped.
41 @param EntryPoint A pointer to function to call with the new stack after
43 @param Context1 A pointer to the context to pass into the EntryPoint
44 function as the first parameter after paging is disabled.
45 @param Context2 A pointer to the context to pass into the EntryPoint
46 function as the second parameter after paging is
48 @param NewStack A pointer to the new stack to use for the EntryPoint
49 function after paging is disabled.
55 InternalX86DisablePaging32 (
56 IN SWITCH_STACK_ENTRY_POINT EntryPoint
,
57 IN VOID
*Context1
, OPTIONAL
58 IN VOID
*Context2
, OPTIONAL
69 pop edi
// save EFLAGS to edi
76 popfd
// restore EFLAGS from edi
80 jmp $
// EntryPoint() should not return