| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Macros for copying by pages; used in memcpy, memmove. Mach version. |
| 2 | Copyright (C) 1995-2016 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. This parameter should be tuned as necessary. */ |
| 23 | #define PAGE_THRESHOLD (2 * PAGE_SIZE) /* XXX ? */ |
| 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))) |