1. Fixed bug in FlushCacheLine.asm, added return value

[mirror_edk2.git] / MdePkg / 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
InternalX86EnablePaging64 PROC\r
    cli
\r
    mov     ebx, [esp + 4]              ; save CS
    mov     eax, OFFSET cs_address
    mov     word ptr [eax], bx          ; Update CS selector for far jump
\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\r
    mov     cr0, eax                    ; enable paging
    retf
    jmp     go_to_long_mode
go_to_long_mode:

    ;
    ; This is the next instruction after enabling paging.  Jump to long mode
    ;
    db      067h
    db      0eah                        ;   Far Jump Offset:Selector to reload CS
    dd      OFFSET in_long_mode         ;   Offset is ensuing instruction boundary
cs_address:
    dw      0h                          ;   CS selector will be updated at runtime 
\r
in_long_mode:                           ; now in long mode
    DB      67h, 48h\r
    mov     ebx, [esp + 8]              ; mov rbx, [esp]\r
    DB      67h, 48h\r                   
    mov     ecx, [esp + 10h]            ; mov rcx, [esp + 8]\r
    DB      67h, 48h\r
    mov     edx, [esp + 18h]            ; mov rdx, [esp + 10h]\r
    DB      67h, 48h\r
    mov     esp, [esp + 20h]            ; mov rsp, [esp + 18h]\r
    DB      48h\r
    call    ebx                         ; call rbx\r
    jmp     $\r
InternalX86EnablePaging64 ENDP\r
\r
    END\r