mirror of
https://github.com/CloverHackyColor/CloverBootloader.git
synced 2024-11-28 12:25:19 +01:00
47 lines
1.4 KiB
NASM
47 lines
1.4 KiB
NASM
;------------------------------------------------------------------------------
|
|
; @file
|
|
; Transition from 32 bit flat protected mode into 64 bit flat protected mode
|
|
;
|
|
; Copyright (c) 2008 - 2009, Intel Corporation. All rights reserved.<BR>
|
|
; 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
|
|
|