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/elf.h> 27 #include <exec/pager.h> 28 #include <exec/segment.h> 29 #include <fsserver/notification.h> 30 #include <fsserver/resource.h> 31 32 #include "notifier_interface.h" 33 #include "parent_pager_object_interface.h" 34 35 36 37 /* A simple system pager also acting as a region mapper. */ 38 39 class ExternalPager : public ExecPager, public ParentPagerObject, 40 public NotificationSupport, public Resource 41 { 42 protected: 43 44 /* Resources associated with the created process. */ 45 46 l4_cap_idx_t _task = L4_INVALID_CAP, _mapped_task = L4_INVALID_CAP, 47 _parent = L4_INVALID_CAP, _mapped_parent = L4_INVALID_CAP, 48 _pager = L4_INVALID_CAP, _mapped_pager = L4_INVALID_CAP, 49 _ipc_gate = L4_INVALID_CAP; 50 std::vector<l4_cap_idx_t> _threads, _mapped_threads; 51 52 /* Resources supporting the internal pager. */ 53 54 ExplicitSegment *_rm_stack = NULL; 55 Payload *_rm_payload = NULL; 56 57 public: 58 explicit ExternalPager(address_t start = 0, address_t end = 0); 59 60 /* Server details. */ 61 62 virtual ipc_server_default_config_type config(); 63 64 virtual void *interface() 65 { return static_cast<ParentPagerObject *>(this); } 66 67 /* Task and thread management. */ 68 69 virtual void add_thread(l4_cap_idx_t cap, l4_cap_idx_t mapped_cap); 70 virtual void set_gate(l4_cap_idx_t cap); 71 virtual void set_pager(l4_cap_idx_t cap, l4_cap_idx_t mapped_cap); 72 virtual void set_parent(l4_cap_idx_t cap, l4_cap_idx_t mapped_cap); 73 virtual void set_task(l4_cap_idx_t cap, l4_cap_idx_t mapped_cap); 74 75 /* Internal pager resource management. */ 76 77 virtual void set_payload(Payload *payload); 78 virtual void set_stack(ExplicitSegment *stack); 79 80 /* Resource methods. */ 81 82 virtual void close(); 83 84 /* Notification methods, implementing PagerObject. */ 85 86 virtual long exception(l4_exc_regs_t regs, 87 l4_snd_fpage_t *region); 88 89 virtual long page_fault(l4_umword_t pfa, l4_umword_t pc, 90 l4_snd_fpage_t *region); 91 92 /* Region manager/mapper methods. */ 93 94 virtual long attach(address_t *start, address_t size, map_flags_t flags, 95 l4_cap_idx_t ds, address_t offset, unsigned char align); 96 97 /* Parent methods. */ 98 99 virtual long signal(unsigned long sig, unsigned long val); 100 101 /* Notification methods. */ 102 103 virtual long subscribe(l4_cap_idx_t notifier, notify_flags_t flags); 104 105 virtual long unsubscribe(l4_cap_idx_t notifier); 106 }; 107 108 /* vim: tabstop=2 expandtab shiftwidth=2 109 */