| paul@93 | 1 | /* |
| paul@93 | 2 | * A pipe opener resource. |
| paul@93 | 3 | * |
| paul@300 | 4 | * Copyright (C) 2021, 2022 Paul Boddie <paul@boddie.org.uk> |
| paul@93 | 5 | * |
| paul@93 | 6 | * This program is free software; you can redistribute it and/or |
| paul@93 | 7 | * modify it under the terms of the GNU General Public License as |
| paul@93 | 8 | * published by the Free Software Foundation; either version 2 of |
| paul@93 | 9 | * the License, or (at your option) any later version. |
| paul@93 | 10 | * |
| paul@93 | 11 | * This program is distributed in the hope that it will be useful, |
| paul@93 | 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| paul@93 | 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| paul@93 | 14 | * GNU General Public License for more details. |
| paul@93 | 15 | * |
| paul@93 | 16 | * You should have received a copy of the GNU General Public License |
| paul@93 | 17 | * along with this program; if not, write to the Free Software |
| paul@93 | 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| paul@93 | 19 | * Boston, MA 02110-1301, USA |
| paul@93 | 20 | */ |
| paul@93 | 21 | |
| paul@161 | 22 | #include <ipc/cap_alloc.h> |
| paul@535 | 23 | #include <resource/resource_server.h> |
| paul@161 | 24 | |
| paul@300 | 25 | #include <l4/cxx/exceptions> |
| paul@300 | 26 | |
| paul@65 | 27 | #include "pipe_opener_resource.h" |
| paul@65 | 28 | #include "pipe_opener_server.h" |
| paul@65 | 29 | #include "pipe_pager.h" |
| paul@65 | 30 | |
| paul@65 | 31 | |
| paul@65 | 32 | |
| paul@65 | 33 | /* Support for providing access to pipes. */ |
| paul@65 | 34 | |
| paul@70 | 35 | PipeOpenerResource::PipeOpenerResource(Memory *memory) |
| paul@70 | 36 | : _memory(memory) |
| paul@70 | 37 | { |
| paul@70 | 38 | } |
| paul@70 | 39 | |
| paul@459 | 40 | ipc_server_default_config_type PipeOpenerResource::config() |
| paul@65 | 41 | { |
| paul@459 | 42 | return config_PipeOpener; |
| paul@65 | 43 | } |
| paul@65 | 44 | |
| paul@65 | 45 | |
| paul@65 | 46 | |
| paul@65 | 47 | /* Pipe opener interface methods. */ |
| paul@65 | 48 | |
| paul@66 | 49 | long PipeOpenerResource::pipe(offset_t size, l4_cap_idx_t *reader, l4_cap_idx_t *writer) |
| paul@65 | 50 | { |
| paul@65 | 51 | /* Both endpoints will employ a common paging coordinator. */ |
| paul@65 | 52 | |
| paul@300 | 53 | PipePaging *paging; |
| paul@300 | 54 | |
| paul@300 | 55 | try |
| paul@300 | 56 | { |
| paul@300 | 57 | paging = new PipePaging(_memory, size); |
| paul@300 | 58 | } |
| paul@300 | 59 | catch (L4::Out_of_memory const &e) |
| paul@300 | 60 | { |
| paul@300 | 61 | return -L4_ENOMEM; |
| paul@300 | 62 | } |
| paul@65 | 63 | |
| paul@65 | 64 | /* Each endpoint will have its own pager. */ |
| paul@65 | 65 | |
| paul@161 | 66 | long err = open_endpoint(paging, true, writer); |
| paul@161 | 67 | |
| paul@161 | 68 | if (err) |
| paul@161 | 69 | return err; |
| paul@161 | 70 | |
| paul@161 | 71 | err = open_endpoint(paging, false, reader); |
| paul@65 | 72 | |
| paul@161 | 73 | /* Failure to open an endpoint should invalidate both, plus the paging |
| paul@161 | 74 | object. Also, any active server thread would need to be cancelled. The |
| paul@161 | 75 | freeing of the writer capability attempts to do this. */ |
| paul@161 | 76 | |
| paul@161 | 77 | if (err) |
| paul@161 | 78 | { |
| paul@161 | 79 | ipc_cap_free_um(*writer); |
| paul@161 | 80 | return err; |
| paul@161 | 81 | } |
| paul@161 | 82 | |
| paul@161 | 83 | return L4_EOK; |
| paul@65 | 84 | } |
| paul@65 | 85 | |
| paul@120 | 86 | /* Start the endpoint server in a new thread. If the thread does not start, the |
| paul@120 | 87 | resource (including pager) will be finalised. */ |
| paul@120 | 88 | |
| paul@66 | 89 | long PipeOpenerResource::open_endpoint(PipePaging *paging, bool writing, l4_cap_idx_t *endpoint) |
| paul@65 | 90 | { |
| paul@66 | 91 | PipePager *pager = new PipePager(paging, writing); |
| paul@65 | 92 | |
| paul@120 | 93 | return ResourceServer(pager).start_thread(endpoint); |
| paul@65 | 94 | } |
| paul@65 | 95 | |
| paul@65 | 96 | // vim: tabstop=4 expandtab shiftwidth=4 |
