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|
; $Id: bs3-mode-PagingGetRootForLM64.asm $
;; @file
; BS3Kit - Bs3PagingGetRootForLM64
;
;
; Copyright (C) 2007-2019 Oracle Corporation
;
; This file is part of VirtualBox Open Source Edition (OSE), as
; available from http://www.virtualbox.org. This file is free software;
; you can redistribute it and/or modify it under the terms of the GNU
; General Public License (GPL) as published by the Free Software
; Foundation, in version 2 as it comes in the "COPYING" file of the
; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
;
; The contents of this file may alternatively be used under the terms
; of the Common Development and Distribution License Version 1.0
; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
; VirtualBox OSE distribution, in which case the provisions of the
; CDDL are applicable instead of those of the GPL.
;
; You may elect to license modified versions of this file under the
; terms and conditions of either the GPL or the CDDL or both.
;
%include "bs3kit-template-header.mac"
%ifdef TMPL_RM
extern TMPL_NM(Bs3SwitchToPE16)
extern NAME(Bs3SwitchToRM_pe16)
%elifdef TMPL_CMN_V86
extern TMPL_NM(Bs3SwitchToRing0)
extern TMPL_NM(Bs3SwitchTo16BitV86)
%endif
BS3_EXTERN_CMN Bs3PagingInitRootForLM
BS3_EXTERN_DATA16 g_PhysPagingRootLM
TMPL_BEGIN_TEXT
;;
; @cproto BS3_DECL(uint32_t) Bs3PagingGetRootForLM64(void)
;
; @returns eax
;
; @uses ax
;
; @remarks returns value in EAX, not dx:ax!
;
BS3_PROC_BEGIN_MODE Bs3PagingGetRootForLM64, BS3_PBC_NEAR ; Internal function, no far variant necessary.
mov eax, [BS3_DATA16_WRT(g_PhysPagingRootLM)]
cmp eax, 0ffffffffh
je .init_root
%ifdef BS3_STRICT
.return:
cmp eax, 1000h
jnb .cr3_ok_low
hlt
.cr3_ok_low:
cmp eax, 16*_1M
jb .cr3_ok_high
hlt
.cr3_ok_high:
%endif
ret
.init_root:
push xBP
mov xBP, xSP
BONLY16 push es
push sDX
push sCX
push sBX
%if TMPL_BITS == 64
push r8
push r9
push r10
push r11
%endif
%ifdef TMPL_RM
;
; We don't want to be restricted to real mode addressing, so
; temporarily switch to 16-bit protected mode.
;
call TMPL_NM(Bs3SwitchToPE16)
call Bs3PagingInitRootForLM
call NAME(Bs3SwitchToRM_pe16)
%elifdef TMPL_CMN_V86
;
; V8086 mode uses real mode addressing too. Unlikly that we'll
; ever end up here though.
;
call TMPL_NM(Bs3SwitchToRing0)
call Bs3PagingInitRootForLM
call TMPL_NM(Bs3SwitchTo16BitV86)
%else
;
; Not a problematic addressing mode.
;
BONLY64 sub rsp, 20h
BS3_CALL Bs3PagingInitRootForLM, 0
BONLY64 add rsp, 20h
%endif
;
; Load the value and return.
;
mov eax, [BS3_DATA16_WRT(g_PhysPagingRootLM)]
%if TMPL_BITS == 64
pop r11
pop r10
pop r9
pop r8
%endif
pop sBX
pop sCX
pop sDX
BONLY16 pop es
leave
%ifdef BS3_STRICT
jmp .return
%else
ret
%endif
BS3_PROC_END_MODE Bs3PagingGetRootForLM64
|
