| 1 | ; $Id: bs3-cmn-RegGetCr2.asm 96407 2022-08-22 17:43:14Z vboxsync $
|
|---|
| 2 | ;; @file
|
|---|
| 3 | ; BS3Kit - Bs3RegGetCr2
|
|---|
| 4 | ;
|
|---|
| 5 |
|
|---|
| 6 | ;
|
|---|
| 7 | ; Copyright (C) 2007-2022 Oracle and/or its affiliates.
|
|---|
| 8 | ;
|
|---|
| 9 | ; This file is part of VirtualBox base platform packages, as
|
|---|
| 10 | ; available from https://www.virtualbox.org.
|
|---|
| 11 | ;
|
|---|
| 12 | ; This program is free software; you can redistribute it and/or
|
|---|
| 13 | ; modify it under the terms of the GNU General Public License
|
|---|
| 14 | ; as published by the Free Software Foundation, in version 3 of the
|
|---|
| 15 | ; License.
|
|---|
| 16 | ;
|
|---|
| 17 | ; This program is distributed in the hope that it will be useful, but
|
|---|
| 18 | ; WITHOUT ANY WARRANTY; without even the implied warranty of
|
|---|
| 19 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|---|
| 20 | ; General Public License for more details.
|
|---|
| 21 | ;
|
|---|
| 22 | ; You should have received a copy of the GNU General Public License
|
|---|
| 23 | ; along with this program; if not, see <https://www.gnu.org/licenses>.
|
|---|
| 24 | ;
|
|---|
| 25 | ; The contents of this file may alternatively be used under the terms
|
|---|
| 26 | ; of the Common Development and Distribution License Version 1.0
|
|---|
| 27 | ; (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
|
|---|
| 28 | ; in the VirtualBox distribution, in which case the provisions of the
|
|---|
| 29 | ; CDDL are applicable instead of those of the GPL.
|
|---|
| 30 | ;
|
|---|
| 31 | ; You may elect to license modified versions of this file under the
|
|---|
| 32 | ; terms and conditions of either the GPL or the CDDL or both.
|
|---|
| 33 | ;
|
|---|
| 34 | ; SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
|
|---|
| 35 | ;
|
|---|
| 36 |
|
|---|
| 37 | %include "bs3kit-template-header.mac"
|
|---|
| 38 |
|
|---|
| 39 |
|
|---|
| 40 | BS3_EXTERN_CMN Bs3Panic
|
|---|
| 41 | BS3_EXTERN_CMN Bs3Syscall
|
|---|
| 42 | %if TMPL_BITS == 16
|
|---|
| 43 | BS3_EXTERN_DATA16 g_bBs3CurrentMode
|
|---|
| 44 | %endif
|
|---|
| 45 | TMPL_BEGIN_TEXT
|
|---|
| 46 |
|
|---|
| 47 |
|
|---|
| 48 | ;;
|
|---|
| 49 | ; @cproto BS3_CMN_PROTO_STUB(RTCCUINTXREG, Bs3RegGetCr2,(void));
|
|---|
| 50 | ;
|
|---|
| 51 | ; @returns Register value.
|
|---|
| 52 | ; @remarks Does not require 20h of parameter scratch space in 64-bit mode.
|
|---|
| 53 | ;
|
|---|
| 54 | ; @uses No GPRs (only return full register(s)).
|
|---|
| 55 | ;
|
|---|
| 56 | BS3_PROC_BEGIN_CMN Bs3RegGetCr2, BS3_PBC_HYBRID_SAFE
|
|---|
| 57 | BS3_CALL_CONV_PROLOG 0
|
|---|
| 58 | push xBP
|
|---|
| 59 | mov xBP, xSP
|
|---|
| 60 |
|
|---|
| 61 | %if TMPL_BITS == 16
|
|---|
| 62 | ; If V8086 mode we have to go thru a syscall.
|
|---|
| 63 | test byte [BS3_DATA16_WRT(g_bBs3CurrentMode)], BS3_MODE_CODE_V86
|
|---|
| 64 | jnz .via_system_call
|
|---|
| 65 | cmp byte [BS3_DATA16_WRT(g_bBs3CurrentMode)], BS3_MODE_RM
|
|---|
| 66 | je .direct_access
|
|---|
| 67 | %endif
|
|---|
| 68 | ; If not in ring-0, we have to make a system call.
|
|---|
| 69 | mov ax, ss
|
|---|
| 70 | and ax, X86_SEL_RPL
|
|---|
| 71 | jnz .via_system_call
|
|---|
| 72 |
|
|---|
| 73 | .direct_access:
|
|---|
| 74 | mov sAX, cr2
|
|---|
| 75 | TONLY16 mov edx, eax
|
|---|
| 76 | TONLY16 shr edx, 16
|
|---|
| 77 | jmp .return
|
|---|
| 78 |
|
|---|
| 79 | .via_system_call:
|
|---|
| 80 | mov xAX, BS3_SYSCALL_GET_CRX
|
|---|
| 81 | mov dl, 2
|
|---|
| 82 | call Bs3Syscall
|
|---|
| 83 |
|
|---|
| 84 | .return:
|
|---|
| 85 | pop xBP
|
|---|
| 86 | BS3_CALL_CONV_EPILOG 0
|
|---|
| 87 | BS3_HYBRID_RET
|
|---|
| 88 | BS3_PROC_END_CMN Bs3RegGetCr2
|
|---|
| 89 |
|
|---|
