1 ;------------------------------------------------------------------------------
3 ; Copyright (c) 2006, Intel Corporation
4 ; All rights reserved. This program and the accompanying materials
5 ; are licensed and made available under the terms and conditions of the BSD License
6 ; which accompanies this distribution. The full text of the license may be found at
7 ; http://opensource.org/licenses/bsd-license.php
9 ; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
10 ; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
18 ; AsmDisablePaging64 function
22 ;------------------------------------------------------------------------------
26 ;------------------------------------------------------------------------------
29 ; InternalX86DisablePaging64 (
31 ; IN UINT32 EntryPoint,
32 ; IN UINT32 Context1, OPTIONAL
33 ; IN UINT32 Context2, OPTIONAL
36 ;------------------------------------------------------------------------------
37 InternalX86DisablePaging64 PROC
39 shl rcx, 32 ; rcx[32..47] <- Cs
42 or rcx, rax ; rcx[0..47] <- Cs:@F
44 mov eax, [rsp + 28h] ; eax <- New Stack
46 retf ; switch to compatibility mode
48 mov esp, eax ; set up new stack
51 mov cr0, rax ; disable paging
54 and ah, NOT 1 ; clear LME
57 and al, NOT (1 SHL 5) ; clear PAE
59 push rdi ; push Context2
60 push rsi ; push Context1
61 call rdx ; transfer control to EntryPoint
62 hlt ; no one should get here
63 InternalX86DisablePaging64 ENDP