Moved the MdePkg to OldMdePkg so that new code in MdePkg does not break existing...

[mirror_edk2.git] / OldMdePkg / Library / BaseLib / Ia32 / EnablePaging64.asm

;------------------------------------------------------------------------------\r
;\r
; Copyright (c) 2006, Intel Corporation\r
; All rights reserved. This program and the accompanying materials\r
; are licensed and made available under the terms and conditions of the BSD License\r
; which accompanies this distribution.  The full text of the license may be found at\r
; http://opensource.org/licenses/bsd-license.php\r
;\r
; THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
; WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
;\r
; Module Name:\r
;\r
;   EnablePaging64.Asm\r
;\r
; Abstract:\r
;\r
;   AsmEnablePaging64 function\r
;\r
; Notes:\r
;\r
;------------------------------------------------------------------------------\r
\r
    .686p\r
    .model  flat,C\r
    .code\r
\r
;------------------------------------------------------------------------------\r
; VOID\r
; EFIAPI\r
; InternalX86EnablePaging64 (\r
;   IN      UINT16                    Cs,\r
;   IN      UINT64                    EntryPoint,\r
;   IN      UINT64                    Context1,  OPTIONAL\r
;   IN      UINT64                    Context2,  OPTIONAL\r
;   IN      UINT64                    NewStack\r
;   );\r
;------------------------------------------------------------------------------\r
InternalX86EnablePaging64 PROC\r
    cli\r
    mov     [esp], @F                   ; offset for far retf, seg is the 1st arg\r
    mov     eax, cr4\r
    or      al, (1 SHL 5)\r
    mov     cr4, eax                    ; enable PAE\r
    mov     ecx, 0c0000080h\r
    rdmsr\r
    or      ah, 1                       ; set LME\r
    wrmsr\r
    mov     eax, cr0\r
    bts     eax, 31                     ; set PG\r
    mov     cr0, eax                    ; enable paging\r
    retf                                ; topmost 2 dwords hold the address\r
@@:                                     ; long mode starts here\r
    DB      67h, 48h                    ; 32-bit address size, 64-bit operand size\r
    mov     ebx, [esp]                  ; mov rbx, [esp]\r
    DB      67h, 48h\r
    mov     ecx, [esp + 8]              ; mov rcx, [esp + 8]\r
    DB      67h, 48h\r
    mov     edx, [esp + 10h]            ; mov rdx, [esp + 10h]\r
    DB      67h, 48h\r
    mov     esp, [esp + 18h]            ; mov rsp, [esp + 18h]\r
    DB      48h\r
    add     esp, -20h                   ; add rsp, -20h\r
    call    ebx                         ; call rbx\r
    hlt                                 ; no one should get here\r
InternalX86EnablePaging64 ENDP\r
\r
    END\r