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