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, 104 insertions, 0 deletions

diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-SwitchToLM64.asm b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-SwitchToLM64.asm
new file mode 100644
index 00000000..73b71eeb
--- /dev/null
+++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-mode-SwitchToLM64.asm
@@ -0,0 +1,104 @@
+; $Id: bs3-mode-SwitchToLM64.asm $
+;; @file
+; BS3Kit - Bs3SwitchToLM64
+;
+
+;
+; 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"
+
+
+;;
+; Switch to 64-bit long mode from any other mode.
+;
+; @cproto   BS3_DECL(void) Bs3SwitchToLM64(void);
+;
+; @uses     Nothing (except possibly high 32-bit and/or upper 64-bit register parts).
+;
+; @remarks  Obviously returns to 64-bit mode, even if the caller was in 16-bit
+;           or 32-bit mode.  It doesn't not preserve the callers ring, but
+;           instead changes to ring-0.
+;
+; @remarks  Does not require 20h of parameter scratch space in 64-bit mode.
+;
+BS3_GLOBAL_NAME_EX TMPL_NM(Bs3SwitchToLM64_Safe), function, 0
+BS3_PROC_BEGIN_MODE Bs3SwitchToLM64, BS3_PBC_NEAR
+%ifdef TMPL_LM64
+        ret
+
+%elifdef TMPL_CMN_LM
+        ;
+        ; Already in long mode, just switch to 64-bit.
+        ;
+        extern  BS3_CMN_NM(Bs3SwitchTo64Bit)
+        jmp     BS3_CMN_NM(Bs3SwitchTo64Bit)
+
+%else
+        ;
+        ; Switch to LM32 and then switch to 64-bits (IDT & TSS are the same for
+        ; LM16, LM32 and LM64, unlike the rest).
+        ;
+        ; (The long mode switching code is going via 32-bit protected mode, so
+        ; Bs3SwitchToLM32 contains the actual code for switching to avoid
+        ; unnecessary 32-bit -> 64-bit -> 32-bit trips.)
+        ;
+ %ifdef TMPL_16BIT
+        and     esp, 0ffffh
+        push    word [esp]              ; copy return address.
+        and     word [esp + 2], 0       ; clear upper return address
+        add     dword [esp], BS3_ADDR_BS3TEXT16 ; Add base of return segment, completing 32-bit conversion.
+ %endif
+        extern  TMPL_NM(Bs3SwitchToLM32)
+        call    TMPL_NM(Bs3SwitchToLM32)
+        BS3_SET_BITS 32
+
+        extern  _Bs3SwitchTo64Bit_c32
+        jmp     _Bs3SwitchTo64Bit_c32
+%endif
+BS3_PROC_END_MODE   Bs3SwitchToLM64
+
+
+%if TMPL_BITS == 16
+;;
+; Custom far stub.
+BS3_BEGIN_TEXT16_FARSTUBS
+BS3_PROC_BEGIN_MODE Bs3SwitchToLM64, BS3_PBC_FAR
+        inc         bp
+        push        bp
+        mov         bp, sp
+
+        ; Call the real thing.
+        call        TMPL_NM(Bs3SwitchToLM64)
+        BS3_SET_BITS 64
+
+        ; Jmp to common code for the tedious conversion.
+ %if BS3_MODE_IS_RM_OR_V86(TMPL_MODE)
+        extern      _Bs3SwitchHlpConvRealModeRetfPopBpDecBpAndReturn_c64
+        jmp         _Bs3SwitchHlpConvRealModeRetfPopBpDecBpAndReturn_c64
+ %else
+        extern      _Bs3SwitchHlpConvProtModeRetfPopBpDecBpAndReturn_c64
+        jmp         _Bs3SwitchHlpConvProtModeRetfPopBpDecBpAndReturn_c64
+ %endif
+        BS3_SET_BITS 16
+BS3_PROC_END_MODE   Bs3SwitchToLM64
+%endif
+