source: mainline/kernel/generic/src/main/kinit.c@ deed510

ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since deed510 was 1871118, checked in by Jiří Zárevúcky <zarevucky.jiri@…>, 3 years ago

Make thread_t reference counted

This simplifies interaction between various locks and thread
lifespan, which simplifies things. For example, threads_lock can
now simply be a mutex protecting the global it was made for, and
nothing more.
  • Property mode set to 100644
File size: 8.0 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 kernel_generic
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 <stdio.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#include <stdlib.h>
75
76#ifdef CONFIG_SMP
77#include <smp/smp.h>
78#endif /* CONFIG_SMP */
79
80#include <synch/waitq.h>
81#include <synch/spinlock.h>
82
83#define ALIVE_CHARS 4
84
85#ifdef CONFIG_KCONSOLE
86static char alive[ALIVE_CHARS] = "-\\|/";
87#endif
88
89#define INIT_PREFIX "init:"
90#define INIT_PREFIX_LEN 5
91
92/** Kernel initialization thread.
93 *
94 * kinit takes care of higher level kernel
95 * initialization (i.e. thread creation,
96 * userspace initialization etc.).
97 *
98 * @param arg Not used.
99 */
100void kinit(void *arg)
101{
102 thread_t *thread;
103
104 interrupts_disable();
105
106#ifdef CONFIG_SMP
107 if (config.cpu_count > 1) {
108 semaphore_initialize(&ap_completion_semaphore, 0);
109
110 /*
111 * Create the kmp thread and wait for its completion.
112 * cpu1 through cpuN-1 will come up consecutively and
113 * not mess together with kcpulb threads.
114 * Just a beautification.
115 */
116 thread = thread_create(kmp, NULL, TASK,
117 THREAD_FLAG_UNCOUNTED, "kmp");
118 if (!thread)
119 panic("Unable to create kmp thread.");
120
121 thread_wire(thread, &cpus[0]);
122 thread_ready(thread_ref(thread));
123 thread_join(thread);
124 thread_put(thread);
125
126 /*
127 * For each CPU, create its load balancing thread.
128 */
129 unsigned int i;
130
131 for (i = 0; i < config.cpu_count; i++) {
132 thread = thread_create(kcpulb, NULL, TASK,
133 THREAD_FLAG_UNCOUNTED, "kcpulb");
134 if (thread != NULL) {
135 thread_wire(thread, &cpus[i]);
136 thread_ready(thread);
137 } else
138 log(LF_OTHER, LVL_ERROR,
139 "Unable to create kcpulb thread for cpu%u", i);
140 }
141 }
142#endif /* CONFIG_SMP */
143
144 /*
145 * At this point SMP, if present, is configured.
146 */
147 ARCH_OP(post_smp_init);
148
149 /* Start thread computing system load */
150 thread = thread_create(kload, NULL, TASK, THREAD_FLAG_NONE,
151 "kload");
152 if (thread != NULL)
153 thread_ready(thread);
154 else
155 log(LF_OTHER, LVL_ERROR, "Unable to create kload thread");
156
157#ifdef CONFIG_KCONSOLE
158 if (stdin) {
159 /*
160 * Create kernel console.
161 */
162 thread = thread_create(kconsole_thread, NULL, TASK,
163 THREAD_FLAG_NONE, "kconsole");
164 if (thread != NULL)
165 thread_ready(thread);
166 else
167 log(LF_OTHER, LVL_ERROR,
168 "Unable to create kconsole thread");
169 }
170#endif /* CONFIG_KCONSOLE */
171
172 /*
173 * Store the default stack size in sysinfo so that uspace can create
174 * stack with this default size.
175 */
176 sysinfo_set_item_val("default.stack_size", NULL, STACK_SIZE_USER);
177
178 interrupts_enable();
179
180 /*
181 * Create user tasks, load RAM disk images.
182 */
183 size_t i;
184 program_t programs[CONFIG_INIT_TASKS];
185
186 // FIXME: do not propagate arguments through sysinfo
187 // but pass them directly to the tasks
188 for (i = 0; i < init.cnt; i++) {
189 const char *arguments = init.tasks[i].arguments;
190 if (str_length(arguments) == 0)
191 continue;
192 if (str_length(init.tasks[i].name) == 0)
193 continue;
194 size_t arguments_size = str_size(arguments);
195
196 void *arguments_copy = malloc(arguments_size);
197 if (arguments_copy == NULL)
198 continue;
199 memcpy(arguments_copy, arguments, arguments_size);
200
201 char item_name[CONFIG_TASK_NAME_BUFLEN + 15];
202 snprintf(item_name, CONFIG_TASK_NAME_BUFLEN + 15,
203 "init_args.%s", init.tasks[i].name);
204
205 sysinfo_set_item_data(item_name, NULL, arguments_copy, arguments_size);
206 }
207
208 for (i = 0; i < init.cnt; i++) {
209 if (init.tasks[i].paddr % FRAME_SIZE) {
210 log(LF_OTHER, LVL_ERROR,
211 "init[%zu]: Address is not frame aligned", i);
212 programs[i].task = NULL;
213 continue;
214 }
215
216 /*
217 * Construct task name from the 'init:' prefix and the
218 * name stored in the init structure (if any).
219 */
220
221 char namebuf[TASK_NAME_BUFLEN];
222
223 const char *name = init.tasks[i].name;
224 if (name[0] == 0)
225 name = "<unknown>";
226
227 static_assert(TASK_NAME_BUFLEN >= INIT_PREFIX_LEN, "");
228 str_cpy(namebuf, TASK_NAME_BUFLEN, INIT_PREFIX);
229 str_cpy(namebuf + INIT_PREFIX_LEN,
230 TASK_NAME_BUFLEN - INIT_PREFIX_LEN, name);
231
232 /*
233 * Create virtual memory mappings for init task images.
234 */
235 uintptr_t page = km_map(init.tasks[i].paddr,
236 init.tasks[i].size, PAGE_SIZE,
237 PAGE_READ | PAGE_WRITE | PAGE_CACHEABLE);
238 assert(page);
239
240 if (str_cmp(name, "loader") == 0) {
241 /* Register image as the program loader */
242 if (program_loader == NULL) {
243 program_loader = (void *) page;
244 log(LF_OTHER, LVL_NOTE, "Program loader at %p",
245 program_loader);
246 } else {
247 log(LF_OTHER, LVL_ERROR,
248 "init[%zu]: Second binary named \"loader\""
249 " present.", i);
250 }
251
252 programs[i].task = NULL;
253 continue;
254 }
255
256 errno_t rc = program_create_from_image((void *) page, namebuf,
257 &programs[i]);
258
259 if (rc == 0) {
260 assert(programs[i].task != NULL);
261
262 /*
263 * Set permissions to init userspace tasks.
264 */
265 perm_set(programs[i].task,
266 PERM_PERM | PERM_MEM_MANAGER |
267 PERM_IO_MANAGER | PERM_IRQ_REG);
268
269 if (!ipc_box_0) {
270 ipc_box_0 = &programs[i].task->answerbox;
271 /*
272 * Hold the first task so that
273 * ipc_box_0 remains a valid pointer
274 * even if the first task exits for
275 * whatever reason.
276 */
277 task_hold(programs[i].task);
278 }
279
280 } else if (i == init.cnt - 1) {
281 /*
282 * Assume the last task is the RAM disk.
283 */
284 init_rd((void *) init.tasks[i].paddr, init.tasks[i].size);
285 } else {
286 log(LF_OTHER, LVL_ERROR,
287 "init[%zu]: Init binary load failed "
288 "(error %s, loader status %s)", i,
289 str_error_name(rc), str_error_name(programs[i].loader_status));
290 }
291 }
292
293 /*
294 * Run user tasks.
295 */
296 for (i = 0; i < init.cnt; i++) {
297 if (programs[i].task != NULL)
298 program_ready(&programs[i]);
299 }
300
301#ifdef CONFIG_KCONSOLE
302 if (!stdin) {
303 thread_sleep(10);
304 printf("kinit: No stdin\nKernel alive: .");
305
306 unsigned int i = 0;
307 while (true) {
308 printf("\b%c", alive[i % ALIVE_CHARS]);
309 thread_sleep(1);
310 i++;
311 }
312 }
313#endif /* CONFIG_KCONSOLE */
314}
315
316/** @}
317 */
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