1;------------------------------------------------------------------------------
2; @file
3; Transition from 32 bit flat protected mode into 64 bit flat protected mode
4;
5; Copyright (c) 2008 - 2013, Intel Corporation. All rights reserved.<BR>
6; This program and the accompanying materials
7; are licensed and made available under the terms and conditions of the BSD License
8; which accompanies this distribution.  The full text of the license may be found at
9; http://opensource.org/licenses/bsd-license.php
10;
11; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
12; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
13;
14;------------------------------------------------------------------------------
15
16BITS    32
17
18;
19; Modified:  EAX
20;
21Transition32FlatTo64Flat:
22
23    OneTimeCall SetCr3ForPageTables64
24
25    mov     eax, cr4
26    bts     eax, 5                      ; enable PAE
27    mov     cr4, eax
28
29    mov     ecx, 0xc0000080
30    rdmsr
31    bts     eax, 8                      ; set LME
32    wrmsr
33
34    mov     eax, cr0
35    bts     eax, 31                     ; set PG
36    mov     cr0, eax                    ; enable paging
37
38    jmp     LINEAR_CODE64_SEL:ADDR_OF(jumpTo64BitAndLandHere)
39BITS    64
40jumpTo64BitAndLandHere:
41
42    debugShowPostCode POSTCODE_64BIT_MODE
43
44    OneTimeCallRet Transition32FlatTo64Flat
45
46