1 #------------------------------------------------------------------------------
3 # Copyright (c) 2006 - 2008, Intel Corporation
4 # All rights reserved. This program and the accompanying materials
5 # are licensed and made available under the terms and conditions of the BSD License
6 # which accompanies this distribution. The full text of the license may be found at
7 # http://opensource.org/licenses/bsd-license.php
9 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
10 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
18 # InternalX86EnablePaging64 function
22 #------------------------------------------------------------------------------
24 .globl ASM_PFX(InternalX86EnablePaging64)
26 #------------------------------------------------------------------------------
29 # InternalX86EnablePaging64 (
30 # IN UINT16 CodeSelector,
31 # IN UINT64 EntryPoint,
32 # IN UINT64 Context1, OPTIONAL
33 # IN UINT64 Context2, OPTIONAL
36 #------------------------------------------------------------------------------
37 ASM_PFX(InternalX86EnablePaging64):
39 movl $LongStart, (%esp) # offset for far retf, seg is the 1st arg
42 movl %eax, %cr4 # enable PAE
43 movl $0xc0000080, %ecx
48 btsl $31, %eax # set PG
49 movl %eax, %cr0 # enable paging
50 lret # topmost 2 dwords hold the address
51 LongStart: # long mode starts here
52 .byte 0x67, 0x48 # 32-bit address size, 64-bit operand size
53 movl (%esp), %ebx # mov rbx, [esp]
55 movl 8(%esp), %ecx # mov rcx, [esp + 8]
57 movl 0x10(%esp), %edx # mov rdx, [esp + 10h]
59 movl 0x18(%esp), %esp # mov rsp, [esp + 18h]
61 addl $0x-0x20, %esp # add rsp, -20h
63 jmp . # no one should get here