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 #ifndef L4RE_DS_MAP_FLAG_RO 33 #define L4RE_DS_MAP_FLAG_RO L4RE_DS_F_R 34 #endif 35 36 #ifndef L4RE_DS_MAP_FLAG_RW 37 #define L4RE_DS_MAP_FLAG_RW L4RE_DS_F_RW 38 #endif 39 40 41 42 /* A flexpage abstraction. */ 43 44 class Flexpage 45 { 46 protected: 47 unsigned int _counter; 48 map_flags_t _flags; 49 50 public: 51 Region *region; 52 53 /* General flexpage characteristics. */ 54 55 offset_t base_addr, size; 56 offset_t base_offset; 57 58 /* Transient debugging information. */ 59 60 offset_t page_addr, page_offset; 61 62 /* Associate a flexpage with a memory 'region'. */ 63 64 explicit Flexpage(Region *region) : region(region) 65 { 66 } 67 68 void reset(offset_t offset); 69 70 bool decrement(); 71 72 void increment(); 73 74 void invalidate(); 75 76 bool valid(); 77 78 bool supports_position(offset_t position); 79 80 void upgrade(map_flags_t flags); 81 82 bool modified(); 83 84 SendFlexpage to_send(offset_t offset, offset_t hot_spot, map_flags_t flags, 85 offset_t max_offset=0); 86 87 SendFlexpage to_unmap(); 88 }; 89 90 // vim: tabstop=4 expandtab shiftwidth=4