source: mainline/kernel/generic/src/main/main.c@ 49eec93

lfn serial ticket/834-toolchain-update topic/msim-upgrade topic/simplify-dev-export
Last change on this file since 49eec93 was 56976a17, checked in by Martin Decky <martin@…>, 17 years ago

start merging tasklets (more or less a rewrite)
  • Property mode set to 100644
File size: 8.7 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 Main initialization kernel function for all processors.
36 *
37 * During kernel boot, all processors, after architecture dependent
38 * initialization, start executing code found in this file. After
39 * bringing up all subsystems, control is passed to scheduler().
40 *
41 * The bootstrap processor starts executing main_bsp() while
42 * the application processors start executing main_ap().
43 *
44 * @see scheduler()
45 * @see main_bsp()
46 * @see main_ap()
47 */
48
49#include <arch/asm.h>
50#include <context.h>
51#include <print.h>
52#include <panic.h>
53#include <debug.h>
54#include <config.h>
55#include <time/clock.h>
56#include <time/timeout.h>
57#include <proc/scheduler.h>
58#include <proc/thread.h>
59#include <proc/task.h>
60#include <proc/tasklet.h>
61#include <main/kinit.h>
62#include <main/version.h>
63#include <console/kconsole.h>
64#include <cpu.h>
65#include <align.h>
66#include <interrupt.h>
67#include <mm/frame.h>
68#include <mm/page.h>
69#include <genarch/mm/page_pt.h>
70#include <mm/tlb.h>
71#include <mm/as.h>
72#include <mm/slab.h>
73#include <synch/waitq.h>
74#include <synch/futex.h>
75#include <arch/arch.h>
76#include <arch.h>
77#include <arch/faddr.h>
78#include <ipc/ipc.h>
79#include <macros.h>
80#include <adt/btree.h>
81#include <console/klog.h>
82#include <smp/smp.h>
83#include <ddi/ddi.h>
84
85/** Global configuration structure. */
86config_t config;
87
88/** Initial user-space tasks */
89init_t init = {
90 .cnt = 0
91};
92
93/** Boot allocations. */
94ballocs_t ballocs = {
95 .base = NULL,
96 .size = 0
97};
98
99context_t ctx;
100
101/*
102 * These 'hardcoded' variables will be intialized by
103 * the linker or the low level assembler code with
104 * appropriate sizes and addresses.
105 */
106
107/**< Virtual address of where the kernel is loaded. */
108uintptr_t hardcoded_load_address = 0;
109/**< Size of the kernel code in bytes. */
110size_t hardcoded_ktext_size = 0;
111/**< Size of the kernel data in bytes. */
112size_t hardcoded_kdata_size = 0;
113/**< Lowest safe stack virtual address. */
114uintptr_t stack_safe = 0;
115
116void main_bsp(void);
117void main_ap(void);
118
119/*
120 * These two functions prevent stack from underflowing during the
121 * kernel boot phase when SP is set to the very top of the reserved
122 * space. The stack could get corrupted by a fooled compiler-generated
123 * pop sequence otherwise.
124 */
125static void main_bsp_separated_stack(void);
126#ifdef CONFIG_SMP
127static void main_ap_separated_stack(void);
128#endif
129
130#define CONFIG_STACK_SIZE ((1 << STACK_FRAMES) * STACK_SIZE)
131
132/** Main kernel routine for bootstrap CPU.
133 *
134 * Initializes the kernel by bootstrap CPU.
135 * This function passes control directly to
136 * main_bsp_separated_stack().
137 *
138 * Assuming interrupts_disable().
139 *
140 */
141void main_bsp(void)
142{
143 config.cpu_count = 1;
144 config.cpu_active = 1;
145
146 config.base = hardcoded_load_address;
147 config.kernel_size = ALIGN_UP(hardcoded_ktext_size +
148 hardcoded_kdata_size, PAGE_SIZE);
149 config.stack_size = CONFIG_STACK_SIZE;
150
151 /* Initialy the stack is placed just after the kernel */
152 config.stack_base = config.base + config.kernel_size;
153
154 /* Avoid placing stack on top of init */
155 count_t i;
156 for (i = 0; i < init.cnt; i++) {
157 if (PA_overlaps(config.stack_base, config.stack_size,
158 init.tasks[i].addr, init.tasks[i].size))
159 config.stack_base = ALIGN_UP(init.tasks[i].addr +
160 init.tasks[i].size, config.stack_size);
161 }
162
163 /* Avoid placing stack on top of boot allocations. */
164 if (ballocs.size) {
165 if (PA_overlaps(config.stack_base, config.stack_size,
166 ballocs.base, ballocs.size))
167 config.stack_base = ALIGN_UP(ballocs.base +
168 ballocs.size, PAGE_SIZE);
169 }
170
171 if (config.stack_base < stack_safe)
172 config.stack_base = ALIGN_UP(stack_safe, PAGE_SIZE);
173
174 context_save(&ctx);
175 context_set(&ctx, FADDR(main_bsp_separated_stack), config.stack_base,
176 THREAD_STACK_SIZE);
177 context_restore(&ctx);
178 /* not reached */
179}
180
181
182/** Main kernel routine for bootstrap CPU using new stack.
183 *
184 * Second part of main_bsp().
185 *
186 */
187void main_bsp_separated_stack(void)
188{
189 task_t *k;
190 thread_t *t;
191 count_t i;
192
193 the_initialize(THE);
194
195 /*
196 * kconsole data structures must be initialized very early
197 * because other subsystems will register their respective
198 * commands.
199 */
200 kconsole_init();
201
202 /*
203 * Exception handler initialization, before architecture
204 * starts adding its own handlers
205 */
206 exc_init();
207
208 /*
209 * Memory management subsystems initialization.
210 */
211 arch_pre_mm_init();
212 frame_init();
213 /* Initialize at least 1 memory segment big enough for slab to work. */
214 slab_cache_init();
215 btree_init();
216 as_init();
217 page_init();
218 tlb_init();
219 ddi_init();
220 tasklet_init();
221 arch_post_mm_init();
222
223 version_print();
224 printf("kernel: %.*p hardcoded_ktext_size=%zd KB, "
225 "hardcoded_kdata_size=%zd KB\n", sizeof(uintptr_t) * 2,
226 config.base, SIZE2KB(hardcoded_ktext_size),
227 SIZE2KB(hardcoded_kdata_size));
228 printf("stack: %.*p size=%zd KB\n", sizeof(uintptr_t) * 2,
229 config.stack_base, SIZE2KB(config.stack_size));
230
231 arch_pre_smp_init();
232 smp_init();
233 /* Slab must be initialized after we know the number of processors. */
234 slab_enable_cpucache();
235
236 printf("Detected %zu CPU(s), %llu MB free memory\n",
237 config.cpu_count, SIZE2MB(zone_total_size()));
238 cpu_init();
239
240 calibrate_delay_loop();
241 clock_counter_init();
242 timeout_init();
243 scheduler_init();
244 task_init();
245 thread_init();
246 futex_init();
247 klog_init();
248
249 if (init.cnt > 0) {
250 for (i = 0; i < init.cnt; i++)
251 printf("init[%zd].addr=%.*p, init[%zd].size=%zd\n", i,
252 sizeof(uintptr_t) * 2, init.tasks[i].addr, i,
253 init.tasks[i].size);
254 } else
255 printf("No init binaries found\n");
256
257 ipc_init();
258
259 /*
260 * Create kernel task.
261 */
262 k = task_create(AS_KERNEL, "kernel");
263 if (!k)
264 panic("can't create kernel task\n");
265
266 /*
267 * Create the first thread.
268 */
269 t = thread_create(kinit, NULL, k, 0, "kinit", true);
270 if (!t)
271 panic("can't create kinit thread\n");
272 thread_ready(t);
273
274 /*
275 * This call to scheduler() will return to kinit,
276 * starting the thread of kernel threads.
277 */
278 scheduler();
279 /* not reached */
280}
281
282
283#ifdef CONFIG_SMP
284/** Main kernel routine for application CPUs.
285 *
286 * Executed by application processors, temporary stack
287 * is at ctx.sp which was set during BSP boot.
288 * This function passes control directly to
289 * main_ap_separated_stack().
290 *
291 * Assuming interrupts_disable()'d.
292 *
293 */
294void main_ap(void)
295{
296 /*
297 * Incrementing the active CPU counter will guarantee that the
298 * *_init() functions can find out that they need to
299 * do initialization for AP only.
300 */
301 config.cpu_active++;
302
303 /*
304 * The THE structure is well defined because ctx.sp is used as stack.
305 */
306 the_initialize(THE);
307
308 arch_pre_mm_init();
309 frame_init();
310 page_init();
311 tlb_init();
312 arch_post_mm_init();
313
314 cpu_init();
315 calibrate_delay_loop();
316 arch_post_cpu_init();
317
318 the_copy(THE, (the_t *) CPU->stack);
319
320 /*
321 * If we woke kmp up before we left the kernel stack, we could
322 * collide with another CPU coming up. To prevent this, we
323 * switch to this cpu's private stack prior to waking kmp up.
324 */
325 context_set(&CPU->saved_context, FADDR(main_ap_separated_stack),
326 (uintptr_t) CPU->stack, CPU_STACK_SIZE);
327 context_restore(&CPU->saved_context);
328 /* not reached */
329}
330
331
332/** Main kernel routine for application CPUs using new stack.
333 *
334 * Second part of main_ap().
335 *
336 */
337void main_ap_separated_stack(void)
338{
339 /*
340 * Configure timeouts for this cpu.
341 */
342 timeout_init();
343
344 waitq_wakeup(&ap_completion_wq, WAKEUP_FIRST);
345 scheduler();
346 /* not reached */
347}
348#endif /* CONFIG_SMP */
349
350/** @}
351 */
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