1#------------------------------------------------------------------------------ 2# 3# Copyright (c) 2006 - 2008, Intel Corporation. All rights reserved.<BR> 4# 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. 8# 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. 11# 12# Module Name: 13# 14# EnablePaging64.S 15# 16# Abstract: 17# 18# InternalX86EnablePaging64 function 19# 20# Notes: 21# 22#------------------------------------------------------------------------------ 23 24ASM_GLOBAL ASM_PFX(InternalX86EnablePaging64) 25 26#------------------------------------------------------------------------------ 27# VOID 28# EFIAPI 29# InternalX86EnablePaging64 ( 30# IN UINT16 CodeSelector, 31# IN UINT64 EntryPoint, 32# IN UINT64 Context1, OPTIONAL 33# IN UINT64 Context2, OPTIONAL 34# IN UINT64 NewStack 35# ); 36#------------------------------------------------------------------------------ 37ASM_PFX(InternalX86EnablePaging64): 38 cli 39 movl $LongStart, (%esp) # offset for far retf, seg is the 1st arg 40 movl %cr4, %eax 41 orb $0x20, %al 42 movl %eax, %cr4 # enable PAE 43 movl $0xc0000080, %ecx 44 rdmsr 45 orb $1, %ah # set LME 46 wrmsr 47 movl %cr0, %eax 48 btsl $31, %eax # set PG 49 movl %eax, %cr0 # enable paging 50 lret # topmost 2 dwords hold the address 51LongStart: # long mode starts here 52 .byte 0x67, 0x48 # 32-bit address size, 64-bit operand size 53 movl (%esp), %ebx # mov rbx, [esp] 54 .byte 0x67, 0x48 55 movl 8(%esp), %ecx # mov rcx, [esp + 8] 56 .byte 0x67, 0x48 57 movl 0x10(%esp), %edx # mov rdx, [esp + 10h] 58 .byte 0x67, 0x48 59 movl 0x18(%esp), %esp # mov rsp, [esp + 18h] 60 .byte 0x48 61 addl $-0x20, %esp # add rsp, -20h 62 call *%ebx # call rbx 63 jmp . # no one should get here 64