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Diffstat (limited to '')
-rw-r--r-- | src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemCpy.c | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemCpy.c b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemCpy.c new file mode 100644 index 00000000..9bbbe3c6 --- /dev/null +++ b/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemCpy.c @@ -0,0 +1,85 @@ +/* $Id: bs3-cmn-MemCpy.c $ */ +/** @file + * BS3Kit - Bs3MemCpy + */ + +/* + * 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 Bs3MemCpy +BS3_CMN_DEF(void BS3_FAR *, Bs3MemCpy,(void BS3_FAR *pvDst, const void BS3_FAR *pvSrc, size_t cbToCopy)) +{ +#if 1 + const size_t BS3_FAR *pBigSrc = (const size_t BS3_FAR *)pvSrc; + size_t BS3_FAR *pBigDst = (size_t *)pvDst; + size_t cBig = cbToCopy / sizeof(size_t); + while (cBig-- > 0) + *pBigDst++ = *pBigSrc++; + + switch (cbToCopy % sizeof(size_t)) + { +#if TMPL_BITS >= 64 + case 7: ((uint8_t BS3_FAR *)pBigDst)[6] = ((const uint8_t BS3_FAR *)pBigSrc)[6]; + case 6: ((uint8_t BS3_FAR *)pBigDst)[5] = ((const uint8_t BS3_FAR *)pBigSrc)[5]; + case 5: ((uint8_t BS3_FAR *)pBigDst)[4] = ((const uint8_t BS3_FAR *)pBigSrc)[4]; + case 4: ((uint8_t BS3_FAR *)pBigDst)[3] = ((const uint8_t BS3_FAR *)pBigSrc)[3]; +#endif +#if TMPL_BITS >= 32 + case 3: ((uint8_t BS3_FAR *)pBigDst)[2] = ((const uint8_t BS3_FAR *)pBigSrc)[2]; + case 2: ((uint8_t BS3_FAR *)pBigDst)[1] = ((const uint8_t BS3_FAR *)pBigSrc)[1]; +#endif + case 1: ((uint8_t BS3_FAR *)pBigDst)[0] = ((const uint8_t BS3_FAR *)pBigSrc)[0]; + case 0: + break; + } + +#else + size_t cLargeRounds; + BS3CPTRUNION uSrc; + BS3PTRUNION uDst; + uSrc.pv = pvSrc; + uDst.pv = pvDst; + + cLargeRounds = cbToCopy / sizeof(*uSrc.pcb); + while (cLargeRounds-- > 0) + *uDst.pcb++ = *uSrc.pcb++; + + cbToCopy %= sizeof(*uSrc.pcb); + while (cbToCopy-- > 0) + *uDst.pb++ = *uSrc.pb++; + +#endif + + return pvDst; +} + |