/* Macros for copying by pages; used in memcpy, memmove. Copyright (C) 1995-2018 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