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, 110 insertions, 0 deletions

diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-TrapRmV86Init.c b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-TrapRmV86Init.c
new file mode 100644
index 00000000..ec341e94
--- /dev/null
+++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-TrapRmV86Init.c
@@ -0,0 +1,110 @@
+/* $Id: bs3-cmn-TrapRmV86Init.c $ */
+/** @file
+ * BS3Kit - Bs3TrapRmV86Init
+ */
+
+/*
+ * 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.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include "bs3kit-template-header.h"
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+/* We ASSUME that BS3CLASS16CODE is 64KB aligned, so the low 16-bit of the
+   flat address matches.   Also, these symbols are defined both with
+   and without underscore prefixes. */
+extern BS3_DECL(void) BS3_FAR_CODE Bs3TrapRmV86GenericEntries(void);
+
+/* These two are ugly.  Need data access for patching purposes. */
+extern uint8_t  BS3_FAR_DATA bs3TrapRmV86GenericTrapOrInt[];
+
+/* bs3-cmn-TrapRmV86Data.c: */
+#define g_fBs3RmIvtCopied   BS3_DATA_NM(g_fBs3RmIvtCopied)
+extern bool    g_fBs3RmIvtCopied;
+
+
+#undef Bs3TrapRmV86InitEx
+BS3_CMN_DEF(void, Bs3TrapRmV86InitEx,(bool f386Plus))
+{
+    RTFAR16 BS3_FAR *paIvt = Bs3XptrFlatToCurrent(0);
+    unsigned iIvt;
+
+    /*
+     * Copy the real mode IVT the first time we are here.
+     */
+    if (!g_fBs3RmIvtCopied)
+    {
+        Bs3MemCpy(g_aBs3RmIvtOriginal, paIvt, sizeof(g_aBs3RmIvtOriginal));
+        g_fBs3RmIvtCopied = true;
+    }
+    /*
+     * The rest of the times, we copy back the original and modify it.
+     */
+    else
+        Bs3MemCpy(paIvt, g_aBs3RmIvtOriginal, sizeof(g_aBs3RmIvtOriginal));
+
+
+    /*
+     * If 386 or later, patch the trap handler code to not jump to the 80286
+     * code but continue with the next instruction (the 386+ code).
+     */
+    if (f386Plus)
+    {
+        uint8_t BS3_FAR_DATA *pbFunction = &bs3TrapRmV86GenericTrapOrInt[0];
+#if ARCH_BITS == 16
+        if (g_bBs3CurrentMode != BS3_MODE_RM)
+            pbFunction = (uint8_t BS3_FAR_DATA *)BS3_FP_MAKE(BS3_SEL_TILED + 1, BS3_FP_OFF(pbFunction));
+#endif
+        pbFunction[1] = 0;
+        pbFunction[2] = 0;
+    }
+
+    /*
+     * Since we want to play with V86 mode as well as 8086 and 186 CPUs, we
+     * cannot move the IVT from its default location.  So, modify it in place.
+     *
+     * Note! We must keep INT 10h working, which is easy since the CPU does
+     *       use it (well, it's been reserved for 30+ years).
+     *       Turns out we must not hook INT 6Dh either then, as some real VGA
+     *       BIOS installs their INT 10h handler there as well, and seemingly
+     *       must be using it internally or something.
+     */
+    for (iIvt = 0; iIvt < 256; iIvt++)
+        if (iIvt != 0x10 && iIvt != 0x6d && iIvt != BS3_TRAP_SYSCALL)
+        {
+            paIvt[iIvt].off = (uint16_t)(uintptr_t)Bs3TrapRmV86GenericEntries + iIvt * 8;
+            paIvt[iIvt].sel = BS3_SEL_TEXT16;
+        }
+}
+
+
+#undef Bs3TrapRmV86Init
+BS3_CMN_DEF(void, Bs3TrapRmV86Init,(void))
+{
+    BS3_CMN_NM(Bs3TrapRmV86InitEx)((g_uBs3CpuDetected & BS3CPU_TYPE_MASK) >= BS3CPU_80386);
+}
+