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#------------------------------------------------------------------------------
#
# Copyright (c) 2006 - 2008, 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.S
#
# Abstract:
#
# InternalX86EnablePaging64 function
#
# Notes:
#
#------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(InternalX86EnablePaging64)
#------------------------------------------------------------------------------
# VOID
# EFIAPI
# InternalX86EnablePaging64 (
# IN UINT16 CodeSelector,
# IN UINT64 EntryPoint,
# IN UINT64 Context1, OPTIONAL
# IN UINT64 Context2, OPTIONAL
# IN UINT64 NewStack
# );
#------------------------------------------------------------------------------
ASM_PFX(InternalX86EnablePaging64):
cli
movl $LongStart, (%esp) # offset for far retf, seg is the 1st arg
movl %cr4, %eax
orb $0x20, %al
movl %eax, %cr4 # enable PAE
movl $0xc0000080, %ecx
rdmsr
orb $1, %ah # set LME
wrmsr
movl %cr0, %eax
btsl $31, %eax # set PG
movl %eax, %cr0 # enable paging
lret # topmost 2 dwords hold the address
LongStart: # long mode starts here
.byte 0x67, 0x48 # 32-bit address size, 64-bit operand size
movl (%esp), %ebx # mov rbx, [esp]
.byte 0x67, 0x48
movl 8(%esp), %ecx # mov rcx, [esp + 8]
.byte 0x67, 0x48
movl 0x10(%esp), %edx # mov rdx, [esp + 10h]
.byte 0x67, 0x48
movl 0x18(%esp), %esp # mov rsp, [esp + 18h]
.byte 0x48
addl $0x-0x20, %esp # add rsp, -20h
call *%ebx # call rbx
jmp . # no one should get here
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