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1 | /* Macros for copying by pages; used in memcpy, memmove. Mach version. |
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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 |
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