source: mainline/kernel/generic/src/main/kinit.c@ 57d44dd

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 57d44dd was 57d44dd, checked in by Jiří Zárevúcky <jiri.zarevucky@…>, 7 years ago

Instead of using .interp section, determine loader by name.
  • Property mode set to 100644
File size: 8.3 KB
Line 
1/*
2 * Copyright (c) 2001-2004 Jakub Jermar
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup main
30 * @{
31 */
32
33/**
34 * @file
35 * @brief Kernel initialization thread.
36 *
37 * This file contains kinit kernel thread which carries out
38 * high level system initialization.
39 *
40 * This file is responsible for finishing SMP configuration
41 * and creation of userspace init tasks.
42 */
43
44#include <assert.h>
45#include <main/kinit.h>
46#include <config.h>
47#include <arch.h>
48#include <proc/scheduler.h>
49#include <proc/task.h>
50#include <proc/thread.h>
51#include <proc/program.h>
52#include <panic.h>
53#include <halt.h>
54#include <cpu.h>
55#include <arch/asm.h>
56#include <mm/page.h>
57#include <arch/mm/page.h>
58#include <mm/as.h>
59#include <mm/frame.h>
60#include <mm/km.h>
61#include <print.h>
62#include <log.h>
63#include <mem.h>
64#include <console/console.h>
65#include <interrupt.h>
66#include <console/kconsole.h>
67#include <security/perm.h>
68#include <lib/rd.h>
69#include <ipc/ipc.h>
70#include <str.h>
71#include <sysinfo/stats.h>
72#include <sysinfo/sysinfo.h>
73#include <align.h>
74
75#ifdef CONFIG_SMP
76#include <smp/smp.h>
77#endif /* CONFIG_SMP */
78
79#include <synch/waitq.h>
80#include <synch/spinlock.h>
81#include <synch/workqueue.h>
82#include <synch/rcu.h>
83
84#define ALIVE_CHARS 4
85
86#ifdef CONFIG_KCONSOLE
87static char alive[ALIVE_CHARS] = "-\\|/";
88#endif
89
90#define INIT_PREFIX "init:"
91#define INIT_PREFIX_LEN 5
92
93/** Kernel initialization thread.
94 *
95 * kinit takes care of higher level kernel
96 * initialization (i.e. thread creation,
97 * userspace initialization etc.).
98 *
99 * @param arg Not used.
100 */
101void kinit(void *arg)
102{
103 thread_t *thread;
104
105 /*
106 * Detach kinit as nobody will call thread_join_timeout() on it.
107 */
108 thread_detach(THREAD);
109
110 interrupts_disable();
111
112 /* Start processing RCU callbacks. RCU is fully functional afterwards. */
113 rcu_kinit_init();
114
115 /*
116 * Start processing work queue items. Some may have been queued during boot.
117 */
118 workq_global_worker_init();
119
120#ifdef CONFIG_SMP
121 if (config.cpu_count > 1) {
122 waitq_initialize(&ap_completion_wq);
123
124 /*
125 * Create the kmp thread and wait for its completion.
126 * cpu1 through cpuN-1 will come up consecutively and
127 * not mess together with kcpulb threads.
128 * Just a beautification.
129 */
130 thread = thread_create(kmp, NULL, TASK,
131 THREAD_FLAG_UNCOUNTED, "kmp");
132 if (thread != NULL) {
133 thread_wire(thread, &cpus[0]);
134 thread_ready(thread);
135 } else
136 panic("Unable to create kmp thread.");
137
138 thread_join(thread);
139 thread_detach(thread);
140
141 /*
142 * For each CPU, create its load balancing thread.
143 */
144 unsigned int i;
145
146 for (i = 0; i < config.cpu_count; i++) {
147 thread = thread_create(kcpulb, NULL, TASK,
148 THREAD_FLAG_UNCOUNTED, "kcpulb");
149 if (thread != NULL) {
150 thread_wire(thread, &cpus[i]);
151 thread_ready(thread);
152 } else
153 log(LF_OTHER, LVL_ERROR,
154 "Unable to create kcpulb thread for cpu%u", i);
155 }
156 }
157#endif /* CONFIG_SMP */
158
159 /*
160 * At this point SMP, if present, is configured.
161 */
162 ARCH_OP(post_smp_init);
163
164 /* Start thread computing system load */
165 thread = thread_create(kload, NULL, TASK, THREAD_FLAG_NONE,
166 "kload");
167 if (thread != NULL)
168 thread_ready(thread);
169 else
170 log(LF_OTHER, LVL_ERROR, "Unable to create kload thread");
171
172#ifdef CONFIG_KCONSOLE
173 if (stdin) {
174 /*
175 * Create kernel console.
176 */
177 thread = thread_create(kconsole_thread, NULL, TASK,
178 THREAD_FLAG_NONE, "kconsole");
179 if (thread != NULL)
180 thread_ready(thread);
181 else
182 log(LF_OTHER, LVL_ERROR,
183 "Unable to create kconsole thread");
184 }
185#endif /* CONFIG_KCONSOLE */
186
187 /*
188 * Store the default stack size in sysinfo so that uspace can create
189 * stack with this default size.
190 */
191 sysinfo_set_item_val("default.stack_size", NULL, STACK_SIZE_USER);
192
193 interrupts_enable();
194
195 /*
196 * Create user tasks, load RAM disk images.
197 */
198 size_t i;
199 program_t programs[CONFIG_INIT_TASKS];
200
201 // FIXME: do not propagate arguments through sysinfo
202 // but pass them directly to the tasks
203 for (i = 0; i < init.cnt; i++) {
204 const char *arguments = init.tasks[i].arguments;
205 if (str_length(arguments) == 0)
206 continue;
207 if (str_length(init.tasks[i].name) == 0)
208 continue;
209 size_t arguments_size = str_size(arguments);
210
211 void *arguments_copy = malloc(arguments_size, 0);
212 if (arguments_copy == NULL)
213 continue;
214 memcpy(arguments_copy, arguments, arguments_size);
215
216 char item_name[CONFIG_TASK_NAME_BUFLEN + 15];
217 snprintf(item_name, CONFIG_TASK_NAME_BUFLEN + 15,
218 "init_args.%s", init.tasks[i].name);
219
220 sysinfo_set_item_data(item_name, NULL, arguments_copy, arguments_size);
221 }
222
223 for (i = 0; i < init.cnt; i++) {
224 if (init.tasks[i].paddr % FRAME_SIZE) {
225 log(LF_OTHER, LVL_ERROR,
226 "init[%zu]: Address is not frame aligned", i);
227 programs[i].task = NULL;
228 continue;
229 }
230
231 /*
232 * Construct task name from the 'init:' prefix and the
233 * name stored in the init structure (if any).
234 */
235
236 char namebuf[TASK_NAME_BUFLEN];
237
238 const char *name = init.tasks[i].name;
239 if (name[0] == 0)
240 name = "<unknown>";
241
242 static_assert(TASK_NAME_BUFLEN >= INIT_PREFIX_LEN, "");
243 str_cpy(namebuf, TASK_NAME_BUFLEN, INIT_PREFIX);
244 str_cpy(namebuf + INIT_PREFIX_LEN,
245 TASK_NAME_BUFLEN - INIT_PREFIX_LEN, name);
246
247 /*
248 * Create virtual memory mappings for init task images.
249 */
250 uintptr_t page = km_map(init.tasks[i].paddr,
251 init.tasks[i].size,
252 PAGE_READ | PAGE_WRITE | PAGE_CACHEABLE);
253 assert(page);
254
255 if (str_cmp(name, "loader") == 0) {
256 /* Register image as the program loader */
257 if (program_loader == NULL) {
258 program_loader = (void *) page;
259 log(LF_OTHER, LVL_NOTE, "Program loader at %p",
260 program_loader);
261 } else {
262 log(LF_OTHER, LVL_ERROR,
263 "init[%zu]: Second binary named \"loader\""
264 " present.", i);
265 }
266 continue;
267 }
268
269 errno_t rc = program_create_from_image((void *) page, namebuf,
270 &programs[i]);
271
272 if (rc == 0) {
273 assert(programs[i].task != NULL);
274
275 /*
276 * Set permissions to init userspace tasks.
277 */
278 perm_set(programs[i].task,
279 PERM_PERM | PERM_MEM_MANAGER |
280 PERM_IO_MANAGER | PERM_IRQ_REG);
281
282 if (!ipc_box_0) {
283 ipc_box_0 = &programs[i].task->answerbox;
284 /*
285 * Hold the first task so that
286 * ipc_box_0 remains a valid pointer
287 * even if the first task exits for
288 * whatever reason.
289 */
290 task_hold(programs[i].task);
291 }
292
293 } else if (i == init.cnt - 1) {
294 /*
295 * Assume the last task is the RAM disk.
296 */
297 init_rd((void *) init.tasks[i].paddr, init.tasks[i].size);
298 } else {
299 log(LF_OTHER, LVL_ERROR,
300 "init[%zu]: Init binary load failed "
301 "(error %s, loader status %u)", i,
302 str_error_name(rc), programs[i].loader_status);
303 }
304 }
305
306 /*
307 * Run user tasks.
308 */
309 for (i = 0; i < init.cnt; i++) {
310 if (programs[i].task != NULL)
311 program_ready(&programs[i]);
312 }
313
314#ifdef CONFIG_KCONSOLE
315 if (!stdin) {
316 thread_sleep(10);
317 printf("kinit: No stdin\nKernel alive: .");
318
319 unsigned int i = 0;
320 while (true) {
321 printf("\b%c", alive[i % ALIVE_CHARS]);
322 thread_sleep(1);
323 i++;
324 }
325 }
326#endif /* CONFIG_KCONSOLE */
327}
328
329/** @}
330 */
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