1; Copyright (c) 2004, Intel Corporation. All rights reserved.<BR>
2; This program and the accompanying materials                          
3; are licensed and made available under the terms and conditions of the BSD License         
4; which accompanies this distribution.  The full text of the license may be found at        
5; http://opensource.org/licenses/bsd-license.php                                            
6;                                                                                           
7; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     
8; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.    
9;
10; Module Name:
11;
12;   EnablePaging64.Asm
13;
14; Abstract:
15;
16;   AsmEnablePaging64 function
17;
18; Notes:
19;
20;------------------------------------------------------------------------------
21
22    .code
23
24;------------------------------------------------------------------------------
25; VOID
26; EFIAPI
27; InternalX86EnablePaging64 (
28;   IN      UINT16                    Cs,
29;   IN      UINT64                    EntryPoint,
30;   IN      UINT64                    Context1,  OPTIONAL
31;   IN      UINT64                    Context2,  OPTIONAL
32;   IN      UINT64                    NewStack
33;   );
34;------------------------------------------------------------------------------
35InternalX86EnablePaging64 PROC
36    cli
37    pop     rax                         ; skip the return address
38    call    @Base
39@Base:
40    add     dword ptr [rsp], @F - @Base ; offset for far retf, seg is the 1st arg
41    mov     rax, cr4                    ; mov eax, cr4
42    or      al, (1 SHL 5)
43    mov     cr4, rax                    ; enable PAE
44    mov     ecx, 0c0000080h
45    rdmsr
46    or      ah, 1                       ; set LME
47    wrmsr
48    mov     rax, cr0                    ; mov eax, cr0
49    bts     eax, 31
50    mov     cr0, rax                    ; enable paging
51    retf
52@@:                                     ; long mode starts here
53    mov     rbx, [esp]
54    mov     rcx, [esp + 8]
55    mov     rdx, [esp + 10h]
56    mov     rsp, [esp + 18h]
57    add     rsp, -20h
58    call    rbx
59    hlt                                 ; halt processor if EntryPoint() returned
60InternalX86EnablePaging64 ENDP
61
62    END
63