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- /* Macros for copying by pages; used in memcpy, memmove.
- Copyright (C) 1995-2019 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
- The GNU C Library 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
- Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
- /* The macro PAGE_COPY_FWD_MAYBE defined in memcopy.h is used in memmove if the
- PAGE_COPY_THRESHOLD macro is set to a non-zero value. The default is 0,
- that is copying by pages is not implemented.
- System-specific pagecopy.h files that want to support page copying should
- define these macros:
- PAGE_COPY_THRESHOLD
- -- A non-zero minimum size for which virtual copying by pages is worthwhile.
- PAGE_SIZE
- -- Size of a page.
- PAGE_COPY_FWD (dstp, srcp, nbytes_left, nbytes)
- -- Macro to perform the virtual copy operation.
- The pointers will be aligned to PAGE_SIZE bytes.
- */
- #define PAGE_COPY_THRESHOLD 0
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