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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:17:27 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:17:27 +0000
commitf215e02bf85f68d3a6106c2a1f4f7f063f819064 (patch)
tree6bb5b92c046312c4e95ac2620b10ddf482d3fa8b /src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemMove.c
parentInitial commit. (diff)
downloadvirtualbox-f215e02bf85f68d3a6106c2a1f4f7f063f819064.tar.xz
virtualbox-f215e02bf85f68d3a6106c2a1f4f7f063f819064.zip
Adding upstream version 7.0.14-dfsg.upstream/7.0.14-dfsg
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemMove.c')
-rw-r--r--src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemMove.c88
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
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+++ 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;
+}
+