1 /* 2 * A system pager implementation residing in a separate task. 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 <vector> 25 26 #include <exec/pager.h> 27 #include <fsserver/notification.h> 28 #include <fsserver/resource.h> 29 30 #include "notifier_interface.h" 31 #include "parent_pager_object_interface.h" 32 33 34 35 /* A simple system pager also acting as a region mapper. */ 36 37 class ExternalPager : public ExecPager, public ParentPagerObject, 38 public NotificationSupport, public Resource 39 { 40 protected: 41 l4_cap_idx_t _task, _rtask, _parent, _rparent, _pager, _rpager, _ipc_gate; 42 std::vector<l4_cap_idx_t> _threads, _rthreads; 43 44 public: 45 explicit ExternalPager(address_t start = 0, address_t end = 0); 46 47 /* Server details. */ 48 49 virtual ipc_server_default_config_type config(); 50 51 virtual void *interface() 52 { return static_cast<ParentPagerObject *>(this); } 53 54 /* Task and thread management. */ 55 56 virtual void add_thread(l4_cap_idx_t cap, l4_cap_idx_t rcap); 57 virtual void set_gate(l4_cap_idx_t cap); 58 virtual void set_pager(l4_cap_idx_t cap, l4_cap_idx_t rcap); 59 virtual void set_parent(l4_cap_idx_t cap, l4_cap_idx_t rcap); 60 virtual void set_task(l4_cap_idx_t cap, l4_cap_idx_t rcap); 61 62 /* Resource methods. */ 63 64 virtual void close(); 65 66 /* Notification methods, implementing PagerObject. */ 67 68 virtual long exception(l4_exc_regs_t regs, 69 l4_snd_fpage_t *region); 70 71 virtual long page_fault(l4_umword_t pfa, l4_umword_t pc, 72 l4_snd_fpage_t *region); 73 74 /* Region manager/mapper methods. */ 75 76 virtual long attach(address_t *start, address_t size, map_flags_t flags, 77 l4_cap_idx_t ds, address_t offset, unsigned char align); 78 79 /* Parent methods. */ 80 81 virtual long signal(unsigned long sig, unsigned long val); 82 83 /* Notification methods. */ 84 85 virtual long subscribe(l4_cap_idx_t notifier, notify_flags_t flags); 86 87 virtual long unsubscribe(l4_cap_idx_t notifier); 88 }; 89 90 /* vim: tabstop=2 expandtab shiftwidth=2 91 */