;------------------------------------------------------------------------------ | |
; @file | |
; Transition from 32 bit flat protected mode into 64 bit flat protected mode | |
; | |
; Copyright (c) 2008 - 2009, Intel Corporation | |
; All rights reserved. This program and the accompanying materials | |
; are licensed and made available under the terms and conditions of the BSD License | |
; which accompanies this distribution. The full text of the license may be found at | |
; http://opensource.org/licenses/bsd-license.php | |
; | |
; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
; | |
;------------------------------------------------------------------------------ | |
BITS 32 | |
; | |
; Modified: EAX | |
; | |
Transition32FlatTo64Flat: | |
mov eax, ((ADDR_OF_START_OF_RESET_CODE & ~0xfff) - 0x1000) | |
mov cr3, eax | |
mov eax, cr4 | |
bts eax, 5 ; enable PAE | |
mov cr4, eax | |
mov ecx, 0xc0000080 | |
rdmsr | |
bts eax, 8 ; set LME | |
wrmsr | |
mov eax, cr0 | |
bts eax, 31 ; set PG | |
mov cr0, eax ; enable paging | |
jmp LINEAR_CODE64_SEL:ADDR_OF(jumpTo64BitAndLandHere) | |
BITS 64 | |
jumpTo64BitAndLandHere: | |
debugShowPostCode POSTCODE_64BIT_MODE | |
OneTimeCallRet Transition32FlatTo64Flat | |