1 /* Macros for copying by pages; used in memcpy, memmove. Mach version. 2 Copyright (C) 1995-2022 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 <https://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