| 1 | /* $Id: bs3-cmn-MemCpy.c 106061 2024-09-16 14:03:52Z vboxsync $ */
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| 2 | /** @file
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| 3 | * BS3Kit - Bs3MemCpy
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2007-2024 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * The contents of this file may alternatively be used under the terms
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| 26 | * of the Common Development and Distribution License Version 1.0
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| 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | * in the VirtualBox distribution, in which case the provisions of the
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| 29 | * CDDL are applicable instead of those of the GPL.
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| 30 | *
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| 31 | * You may elect to license modified versions of this file under the
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| 32 | * terms and conditions of either the GPL or the CDDL or both.
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| 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | */
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| 36 |
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| 37 | #include "bs3kit-template-header.h"
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| 38 |
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| 39 | #undef Bs3MemCpy
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| 40 | BS3_CMN_DEF(void BS3_FAR *, Bs3MemCpy,(void BS3_FAR *pvDst, const void BS3_FAR *pvSrc, size_t cbToCopy))
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| 41 | {
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| 42 | #if 1
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| 43 | const size_t BS3_FAR *pBigSrc = (const size_t BS3_FAR *)pvSrc;
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| 44 | size_t BS3_FAR *pBigDst = (size_t *)pvDst;
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| 45 | size_t cBig = cbToCopy / sizeof(size_t);
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| 46 | while (cBig-- > 0)
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| 47 | *pBigDst++ = *pBigSrc++;
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| 48 |
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| 49 | switch (cbToCopy % sizeof(size_t))
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| 50 | {
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| 51 | #if TMPL_BITS >= 64
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| 52 | case 7: ((uint8_t BS3_FAR *)pBigDst)[6] = ((const uint8_t BS3_FAR *)pBigSrc)[6];
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| 53 | case 6: ((uint8_t BS3_FAR *)pBigDst)[5] = ((const uint8_t BS3_FAR *)pBigSrc)[5];
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| 54 | case 5: ((uint8_t BS3_FAR *)pBigDst)[4] = ((const uint8_t BS3_FAR *)pBigSrc)[4];
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| 55 | case 4: ((uint8_t BS3_FAR *)pBigDst)[3] = ((const uint8_t BS3_FAR *)pBigSrc)[3];
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| 56 | #endif
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| 57 | #if TMPL_BITS >= 32
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| 58 | case 3: ((uint8_t BS3_FAR *)pBigDst)[2] = ((const uint8_t BS3_FAR *)pBigSrc)[2];
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| 59 | case 2: ((uint8_t BS3_FAR *)pBigDst)[1] = ((const uint8_t BS3_FAR *)pBigSrc)[1];
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| 60 | #endif
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| 61 | case 1: ((uint8_t BS3_FAR *)pBigDst)[0] = ((const uint8_t BS3_FAR *)pBigSrc)[0];
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| 62 | case 0:
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| 63 | break;
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| 64 | }
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| 65 |
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| 66 | #else
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| 67 | size_t cLargeRounds;
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| 68 | BS3CPTRUNION uSrc;
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| 69 | BS3PTRUNION uDst;
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| 70 | uSrc.pv = pvSrc;
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| 71 | uDst.pv = pvDst;
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| 72 |
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| 73 | cLargeRounds = cbToCopy / sizeof(*uSrc.pcb);
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| 74 | while (cLargeRounds-- > 0)
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| 75 | *uDst.pcb++ = *uSrc.pcb++;
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| 76 |
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| 77 | cbToCopy %= sizeof(*uSrc.pcb);
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| 78 | while (cbToCopy-- > 0)
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| 79 | *uDst.pb++ = *uSrc.pb++;
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| 80 |
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| 81 | #endif
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| 82 |
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| 83 | return pvDst;
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| 84 | }
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| 85 |
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