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1/* Macros for copying by pages; used in memcpy, memmove. Mach version.
2 Copyright (C) 1995-2019 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <mach.h>
20
21/* Threshold at which vm_copy is more efficient than well-optimized copying
22 by words. */
23#define PAGE_COPY_THRESHOLD (16384)
24
25#define PAGE_SIZE __vm_page_size
26#define PAGE_COPY_FWD(dstp, srcp, nbytes_left, nbytes) \
27 ((nbytes_left) = ((nbytes) \
28 - (__vm_copy (__mach_task_self (), \
29 (vm_address_t) srcp, trunc_page (nbytes), \
30 (vm_address_t) dstp) == KERN_SUCCESS \
31 ? trunc_page (nbytes) \
32 : 0)))
33

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