1 /* 2 * A flexpage abstraction. 3 * 4 * Copyright (C) 2021 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 <mem/memory_utils.h> 25 #include <mem/region.h> 26 #include <mem/send_flexpage.h> 27 28 29 30 /* Work around API change. */ 31 32 #define L4RE_DS_MAP_FLAG_RO L4RE_DS_F_R 33 #define L4RE_DS_MAP_FLAG_RW L4RE_DS_F_RW 34 35 36 37 /* A flexpage abstraction. */ 38 39 class Flexpage 40 { 41 protected: 42 unsigned int _counter; 43 map_flags_t _flags; 44 45 public: 46 Region *region; 47 48 /* General flexpage characteristics. */ 49 50 offset_t base_addr, size; 51 offset_t base_offset; 52 53 /* Transient debugging information. */ 54 55 offset_t page_addr, page_offset; 56 57 /* Associate a flexpage with a memory 'region'. */ 58 59 explicit Flexpage(Region *region) : region(region) 60 { 61 } 62 63 void reset(offset_t offset); 64 65 bool decrement(); 66 67 void increment(); 68 69 void invalidate(); 70 71 bool valid(); 72 73 bool supports_position(offset_t position); 74 75 void upgrade(map_flags_t flags); 76 77 bool modified(); 78 79 SendFlexpage to_send(offset_t offset, offset_t hot_spot, map_flags_t flags, 80 offset_t max_offset=0); 81 82 SendFlexpage to_unmap(); 83 }; 84 85 // vim: tabstop=4 expandtab shiftwidth=4