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; Copyright (c) 2004, 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
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
jmp $ ; halt processor if EntryPoint() returned
InternalX86EnablePaging64 ENDP
END
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