1 /* 2 * Common system pager functionality. 3 * 4 * Copyright (C) 2022, 2023 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 <l4/sys/utcb.h> 25 26 #include <exec/memory_area.h> 27 28 29 30 /* A simple system pager also acting as a region mapper. */ 31 32 class ExecPager 33 { 34 protected: 35 36 /* Top-level area containing other areas and regions. */ 37 38 AvailableMemoryArea _area; 39 40 /* Region manager/mapper functionality. */ 41 42 virtual long find(address_t *start, address_t *size, map_flags_t flags, 43 unsigned char align, MemoryArea **area); 44 45 public: 46 explicit ExecPager(address_t start = 0, address_t end = 0); 47 48 virtual ~ExecPager(); 49 50 /* Region management methods. */ 51 52 virtual void add(MemoryArea &area); 53 54 virtual void remove(MemoryArea &area); 55 56 /* Notification methods. */ 57 58 virtual long exception(l4_exc_regs_t regs, 59 l4_snd_fpage_t *region) = 0; 60 61 virtual long page_fault(l4_umword_t pfa, l4_umword_t pc, 62 l4_snd_fpage_t *region) = 0; 63 }; 64 65 /* vim: tabstop=2 expandtab shiftwidth=2 66 */