1 /* 2 * Generic pager functionality. 3 * 4 * Copyright (C) 2021, 2022 Paul Boddie <paul@boddie.org.uk> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation; either version 2 of 9 * the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, 19 * Boston, MA 02110-1301, USA 20 */ 21 22 #pragma once 23 24 #include <systypes/base.h> 25 26 #include <fsserver/generic_page_mapper.h> 27 #include <resource/resource.h> 28 29 30 31 /* A pager exposing a dataspace. */ 32 33 class Pager : public Resource 34 { 35 protected: 36 offset_t _start, _size; 37 GenericPageMapper *_mapper, *_mapper_base, *_mapper_masked, *_mapper_copied; 38 map_flags_t _map_flags; 39 40 public: 41 explicit Pager(GenericPageMapper *mapper, map_flags_t map_flags); 42 43 virtual void close(); 44 45 /* Paging methods. */ 46 47 virtual long map(offset_t offset, map_address_t hot_spot, map_flags_t map_flags, 48 l4_snd_fpage_t *region); 49 50 /* Limit methods. */ 51 52 offset_t get_data_size(); 53 54 /* File methods. */ 55 56 virtual long flush(offset_t populated_size, offset_t *size); 57 58 virtual long resize(offset_t *size); 59 60 /* Mapped file methods. */ 61 62 virtual long mmap(offset_t position, offset_t length, 63 offset_t start_visible, offset_t end_visible, 64 offset_t *start_pos, offset_t *end_pos, offset_t *size); 65 }; 66 67 // vim: tabstop=4 expandtab shiftwidth=4