1 files changed, 88 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemMove.c b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemMove.c
new file mode 100644
index 00000000..7ac92e4e
--- /dev/null
+++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemMove.c
@@ -0,0 +1,88 @@
+/* $Id: bs3-cmn-MemMove.c $ */
+/** @file
+ * BS3Kit - Bs3MemMove
+ */
+
+/*
+ * Copyright (C) 2007-2023 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox 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.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+#include "bs3kit-template-header.h"
+
+#undef Bs3MemMove
+BS3_CMN_DEF(void BS3_FAR *, Bs3MemMove,(void BS3_FAR *pvDst, const void BS3_FAR *pvSrc, size_t cbToCopy))
+{
+    size_t          cLargeRounds;
+    BS3CVPTRUNION   uSrc;
+    BS3PTRUNION     uDst;
+    uSrc.pv = pvSrc;
+    uDst.pv = pvDst;
+
+    /* We don't care about segment wrapping here. */
+    if ((uintptr_t)pvDst > (uintptr_t)pvSrc + cbToCopy)
+    {
+        /* Reverse copy. */
+        uSrc.pb += cbToCopy;
+        uDst.pb += cbToCopy;
+
+        cLargeRounds = cbToCopy / sizeof(*uSrc.pcb);
+        while (cLargeRounds-- > 0)
+        {
+            size_t uTmp = *--uSrc.pcb;
+            *--uDst.pcb = uTmp;
+        }
+
+        cbToCopy %= sizeof(*uSrc.pcb);
+        while (cbToCopy-- > 0)
+        {
+            uint8_t b = *--uSrc.pb;
+            *--uDst.pb = b;
+        }
+    }
+    else
+    {
+        /* Forward copy. */
+        cLargeRounds = cbToCopy / sizeof(*uSrc.pcb);
+        while (cLargeRounds-- > 0)
+        {
+            size_t uTmp = *uSrc.pcb++;
+            *uDst.pcb++ = uTmp;
+        }
+
+        cbToCopy %= sizeof(*uSrc.pcb);
+        while (cbToCopy-- > 0)
+        {
+            uint8_t b = *uSrc.pb++;
+            *uDst.pb++ = b;
+        }
+    }
+    return pvDst;
+}
+