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      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 
     24 ASM_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 #------------------------------------------------------------------------------
     37 ASM_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
     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]
     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