;------------------------------------------------------------------------------ | |
; @file | |
; Transition from 32 bit flat protected mode into 64 bit flat protected mode | |
; | |
; Copyright (c) 2008 - 2018, Intel Corporation. All rights reserved.<BR> | |
; SPDX-License-Identifier: BSD-2-Clause-Patent | |
; | |
;------------------------------------------------------------------------------ | |
BITS 32 | |
; | |
; Modified: EAX | |
; | |
Transition32FlatTo64Flat: | |
OneTimeCall SetCr3ForPageTables64 | |
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 | |