| xf.li | bdd93d5 | 2023-05-12 07:10:14 -0700 | [diff] [blame] | 1 | /* Macros for copying by pages; used in memcpy, memmove. |
| 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 | /* The macro PAGE_COPY_FWD_MAYBE defined in memcopy.h is used in memmove if the |
| 20 | PAGE_COPY_THRESHOLD macro is set to a non-zero value. The default is 0, |
| 21 | that is copying by pages is not implemented. |
| 22 | |
| 23 | System-specific pagecopy.h files that want to support page copying should |
| 24 | define these macros: |
| 25 | |
| 26 | PAGE_COPY_THRESHOLD |
| 27 | -- A non-zero minimum size for which virtual copying by pages is worthwhile. |
| 28 | |
| 29 | PAGE_SIZE |
| 30 | -- Size of a page. |
| 31 | |
| 32 | PAGE_COPY_FWD (dstp, srcp, nbytes_left, nbytes) |
| 33 | -- Macro to perform the virtual copy operation. |
| 34 | The pointers will be aligned to PAGE_SIZE bytes. |
| 35 | */ |
| 36 | |
| 37 | #define PAGE_COPY_THRESHOLD 0 |