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99f8dc92 | 1 | /* Macros for copying by pages; used in memcpy, memmove. |
688903eb | 2 | Copyright (C) 1995-2018 Free Software Foundation, Inc. |
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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 | |
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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. | |
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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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
478b92f0 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
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16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
67a87b93 | 18 | |
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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. | |
67a87b93 | 22 | |
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23 | System-specific pagecopy.h files that want to support page copying should |
24 | define these macros: | |
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25 | |
26 | PAGE_COPY_THRESHOLD | |
99f8dc92 | 27 | -- A non-zero minimum size for which virtual copying by pages is worthwhile. |
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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 | ||
99f8dc92 | 37 | #define PAGE_COPY_THRESHOLD 0 |