VirtualBox

source: vbox/trunk/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-RegGetDr2.asm@ 84271

Last change on this file since 84271 was 82968, checked in by vboxsync, 5 years ago

Copyright year updates by scm.

  • Property svn:eol-style set to native
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File size: 2.3 KB
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1; $Id: bs3-cmn-RegGetDr2.asm 82968 2020-02-04 10:35:17Z vboxsync $
2;; @file
3; BS3Kit - Bs3RegGetDr2
4;
5
6;
7; Copyright (C) 2007-2020 Oracle Corporation
8;
9; This file is part of VirtualBox Open Source Edition (OSE), as
10; available from http://www.virtualbox.org. This file is free software;
11; you can redistribute it and/or modify it under the terms of the GNU
12; General Public License (GPL) as published by the Free Software
13; Foundation, in version 2 as it comes in the "COPYING" file of the
14; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16;
17; The contents of this file may alternatively be used under the terms
18; of the Common Development and Distribution License Version 1.0
19; (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20; VirtualBox OSE distribution, in which case the provisions of the
21; CDDL are applicable instead of those of the GPL.
22;
23; You may elect to license modified versions of this file under the
24; terms and conditions of either the GPL or the CDDL or both.
25;
26
27%include "bs3kit-template-header.mac"
28
29
30BS3_EXTERN_CMN Bs3Panic
31BS3_EXTERN_CMN Bs3Syscall
32%if TMPL_BITS == 16
33BS3_EXTERN_DATA16 g_bBs3CurrentMode
34%endif
35TMPL_BEGIN_TEXT
36
37
38;;
39; @cproto BS3_CMN_PROTO_STUB(RTCCUINTXREG, Bs3RegGetDr2,(void));
40;
41; @returns Register value.
42; @remarks Does not require 20h of parameter scratch space in 64-bit mode.
43;
44; @uses No GPRs (only return full register(s)).
45;
46BS3_PROC_BEGIN_CMN Bs3RegGetDr2, BS3_PBC_HYBRID_SAFE
47 BS3_CALL_CONV_PROLOG 0
48 push xBP
49 mov xBP, xSP
50
51%if TMPL_BITS == 16
52 ; If V8086 mode we have to go thru a syscall.
53 test byte [BS3_DATA16_WRT(g_bBs3CurrentMode)], BS3_MODE_CODE_V86
54 jnz .via_system_call
55 cmp byte [BS3_DATA16_WRT(g_bBs3CurrentMode)], BS3_MODE_RM
56 je .direct_access
57%endif
58 ; If not in ring-0, we have to make a system call.
59 mov ax, ss
60 and ax, X86_SEL_RPL
61 jnz .via_system_call
62
63.direct_access:
64 mov sAX, dr2
65TONLY16 mov edx, eax
66TONLY16 shr edx, 16
67 jmp .return
68
69.via_system_call:
70 mov xAX, BS3_SYSCALL_GET_DRX
71 mov dl, 2
72 call Bs3Syscall
73
74.return:
75 pop xBP
76 BS3_CALL_CONV_EPILOG 0
77 BS3_HYBRID_RET
78BS3_PROC_END_CMN Bs3RegGetDr2
79
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