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38 lines
1.4 KiB
C
38 lines
1.4 KiB
C
/* Macros for copying by pages; used in memcpy, memmove.
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Copyright (C) 1995-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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/* The macro PAGE_COPY_FWD_MAYBE defined in memcopy.h is used in memmove if the
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PAGE_COPY_THRESHOLD macro is set to a non-zero value. The default is 0,
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that is copying by pages is not implemented.
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System-specific pagecopy.h files that want to support page copying should
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define these macros:
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PAGE_COPY_THRESHOLD
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-- A non-zero minimum size for which virtual copying by pages is worthwhile.
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PAGE_SIZE
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-- Size of a page.
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PAGE_COPY_FWD (dstp, srcp, nbytes_left, nbytes)
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-- Macro to perform the virtual copy operation.
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The pointers will be aligned to PAGE_SIZE bytes.
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*/
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#define PAGE_COPY_THRESHOLD 0
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