Adding upstream version 6.0.4-dfsg.upstream/6.0.4-dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 105 insertions, 0 deletions

diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-A20Disable.asm b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-A20Disable.asm
new file mode 100644
index 00000000..0aa3d1ba
--- /dev/null
+++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-A20Disable.asm
@@ -0,0 +1,105 @@
+; $Id: bs3-cmn-A20Disable.asm $
+;; @file
+; BS3Kit - Bs3A20Disable.
+;
+
+;
+; 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"
+
+
+BS3_EXTERN_CMN Bs3KbdWait
+BS3_EXTERN_CMN Bs3KbdRead
+BS3_EXTERN_CMN Bs3KbdWrite
+
+
+;;
+; Disables the A20 gate.
+;
+; @uses     Nothing.
+;
+BS3_PROC_BEGIN_CMN Bs3A20Disable, BS3_PBC_HYBRID_0_ARGS
+        ; Must call both because they may be ORed together on real HW.
+BONLY64 sub     rsp, 20h
+        call    BS3_CMN_NM(Bs3A20DisableViaKbd)
+        call    BS3_CMN_NM(Bs3A20DisableViaPortA)
+BONLY64 add     rsp, 20h
+        BS3_HYBRID_RET
+BS3_PROC_END_CMN   Bs3A20Disable
+
+
+;;
+; Disables the A20 gate via control port A (PS/2 style).
+;
+; @uses     Nothing.
+;
+BS3_PROC_BEGIN_CMN Bs3A20DisableViaPortA, BS3_PBC_HYBRID_0_ARGS
+        push    xAX
+
+        ; Use Control port A, assuming a PS/2 style system.
+        in      al, 092h
+        test    al, 02h
+        jz      .done                   ; avoid trouble writing back the same value.
+        and     al, 0fdh                ; disable the A20 gate.
+        out     092h, al
+
+.done:
+        pop     xAX
+        BS3_HYBRID_RET
+BS3_PROC_END_CMN   Bs3A20DisableViaPortA
+
+
+;;
+; Disables the A20 gate via the keyboard controller.
+;
+; @uses     Nothing.
+;
+BS3_PROC_BEGIN_CMN Bs3A20DisableViaKbd, BS3_PBC_HYBRID_0_ARGS
+        push    xBP
+        mov     xBP, xSP
+        push    xAX
+        pushf
+        cli
+BONLY64 sub     rsp, 20h
+
+        call    Bs3KbdWait
+        push    0d0h                    ; KBD_CCMD_READ_OUTPORT
+        call    Bs3KbdRead
+
+        and     al, 0fdh                ; ~2
+        push    xAX
+        push    0d1h                    ; KBD_CCMD_WRITE_OUTPORT
+        call    Bs3KbdWrite
+
+        add     xSP, xCB*3              ; Clean up both the above calls.
+
+        mov     al, 0ffh                ; KBD_CMD_RESET
+        out     64h, al
+        call    Bs3KbdWait
+
+BONLY64 add     rsp, 20h
+        popf
+        pop     xAX
+        pop     xBP
+        BS3_HYBRID_RET
+BS3_PROC_END_CMN   Bs3A20DisableViaKbd
+