mirror of https://github.com/acidanthera/audk.git
65 lines
2.2 KiB
NASM
65 lines
2.2 KiB
NASM
|
;------------------------------------------------------------------------------
|
||
|
|
;
|
||
|
|
; Copyright (c) 2006, 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.
|
||
|
|
;
|
||
|
|
; Module Name:
|
||
|
|
;
|
||
|
|
; EnablePaging64.Asm
|
||
|
|
;
|
||
|
|
; Abstract:
|
||
|
|
;
|
||
|
|
; AsmEnablePaging64 function
|
||
|
|
;
|
||
|
|
; Notes:
|
||
|
|
;
|
||
|
|
;------------------------------------------------------------------------------
|
||
|
|
|
||
|
|
.code
|
||
|
|
|
||
|
|
;------------------------------------------------------------------------------
|
||
|
|
; VOID
|
||
|
|
; EFIAPI
|
||
|
|
; InternalX86EnablePaging64 (
|
||
|
|
; IN UINT16 Cs,
|
||
|
|
; IN UINT64 EntryPoint,
|
||
|
|
; IN UINT64 Context1, OPTIONAL
|
||
|
|
; IN UINT64 Context2, OPTIONAL
|
||
|
|
; IN UINT64 NewStack
|
||
|
|
; );
|
||
|
|
;------------------------------------------------------------------------------
|
||
|
|
InternalX86EnablePaging64 PROC
|
||
|
|
cli
|
||
|
|
pop rax ; skip the return address
|
||
|
call @Base
|
||
|
|
@Base:
|
||
|
|
add dword ptr [rsp], @F - @Base ; offset for far retf, seg is the 1st arg
|
||
|
|
mov rax, cr4 ; mov eax, cr4
|
||
|
|
or al, (1 SHL 5)
|
||
|
|
mov cr4, rax ; enable PAE
|
||
|
|
mov ecx, 0c0000080h
|
||
|
|
rdmsr
|
||
|
|
or ah, 1 ; set LME
|
||
|
|
wrmsr
|
||
|
|
mov rax, cr0 ; mov eax, cr0
|
||
|
|
bts eax, 31
|
||
|
|
mov cr0, rax ; enable paging
|
||
|
|
retf
|
||
|
|
@@: ; long mode starts here
|
||
|
|
mov rbx, [esp]
|
||
|
|
mov rcx, [esp + 8]
|
||
|
|
mov rdx, [esp + 10h]
|
||
|
|
mov rsp, [esp + 18h]
|
||
|
|
add rsp, -20h
|
||
|
|
call rbx
|
||
|
|
hlt ; halt processor if EntryPoint() returned
|
||
|
|
InternalX86EnablePaging64 ENDP
|
||
|
|
|
||
|
|
END
|