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 "memory_utils.h" 25 #include "region.h" 26 #include "send_flexpage.h" 27 28 29 30 /* A flexpage abstraction. */ 31 32 class Flexpage 33 { 34 protected: 35 unsigned int _counter; 36 flags_t _flags; 37 38 public: 39 Region *region; 40 41 /* General flexpage characteristics. */ 42 43 offset_t base_addr, size; 44 offset_t base_offset; 45 46 /* Transient debugging information. */ 47 48 offset_t page_addr, page_offset; 49 50 /* Associate a flexpage with a memory 'region'. */ 51 52 explicit Flexpage(Region *region) : region(region) 53 { 54 } 55 56 void reset(offset_t offset); 57 58 bool decrement(); 59 60 void increment(); 61 62 void invalidate(); 63 64 bool valid(); 65 66 bool supports_position(offset_t position); 67 68 void upgrade(flags_t flags); 69 70 SendFlexpage to_send(offset_t offset, offset_t hot_spot, flags_t flags, 71 offset_t max_offset=0); 72 73 SendFlexpage to_unmap(); 74 }; 75 76 // vim: tabstop=4 expandtab shiftwidth=4