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1 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2001-2004 Jakub Jermar
1 jermar 3
 * All rights reserved.
4
 *
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 * Redistribution and use in source and binary forms, with or without
6
 * modification, are permitted provided that the following conditions
7
 * are met:
8
 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
28
 
1729 decky 29
/** @addtogroup main
1702 cejka 30
 * @{
31
 */
32
 
1248 jermar 33
/**
1702 cejka 34
 * @file
1248 jermar 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
 
1 jermar 49
#include <arch/asm.h>
97 jermar 50
#include <context.h>
1 jermar 51
#include <print.h>
68 decky 52
#include <panic.h>
561 decky 53
#include <debug.h>
1 jermar 54
#include <config.h>
55
#include <time/clock.h>
2089 decky 56
#include <time/timeout.h>
1 jermar 57
#include <proc/scheduler.h>
58
#include <proc/thread.h>
59
#include <proc/task.h>
2746 decky 60
#include <proc/tasklet.h>
1 jermar 61
#include <main/kinit.h>
675 jermar 62
#include <main/version.h>
518 jermar 63
#include <console/kconsole.h>
3193 jermar 64
#include <console/console.h>
1 jermar 65
#include <cpu.h>
402 jermar 66
#include <align.h>
578 palkovsky 67
#include <interrupt.h>
1 jermar 68
#include <mm/frame.h>
69
#include <mm/page.h>
684 jermar 70
#include <genarch/mm/page_pt.h>
5 jermar 71
#include <mm/tlb.h>
703 jermar 72
#include <mm/as.h>
759 palkovsky 73
#include <mm/slab.h>
1 jermar 74
#include <synch/waitq.h>
1109 jermar 75
#include <synch/futex.h>
210 decky 76
#include <arch/arch.h>
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#include <arch.h>
76 jermar 78
#include <arch/faddr.h>
955 palkovsky 79
#include <ipc/ipc.h>
1063 palkovsky 80
#include <macros.h>
1164 jermar 81
#include <adt/btree.h>
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#include <smp/smp.h>
2015 jermar 83
#include <ddi/ddi.h>
4153 mejdrech 84
#include <main/main.h>
675 jermar 85
 
1315 jermar 86
/** Global configuration structure. */
1757 jermar 87
config_t config;
675 jermar 88
 
1315 jermar 89
/** Initial user-space tasks */
90
init_t init = {
2745 decky 91
    .cnt = 0
1315 jermar 92
};
93
 
1894 jermar 94
/** Boot allocations. */
95
ballocs_t ballocs = {
96
    .base = NULL,
97
    .size = 0
98
};
99
 
1 jermar 100
context_t ctx;
101
 
1757 jermar 102
/*
523 jermar 103
 * These 'hardcoded' variables will be intialized by
105 jermar 104
 * the linker or the low level assembler code with
105
 * appropriate sizes and addresses.
1 jermar 106
 */
107
 
4153 mejdrech 108
/** Virtual address of where the kernel is loaded. */
2746 decky 109
uintptr_t hardcoded_load_address = 0;
4153 mejdrech 110
/** Size of the kernel code in bytes. */
2746 decky 111
size_t hardcoded_ktext_size = 0;
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/** Size of the kernel data in bytes. */
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size_t hardcoded_kdata_size = 0;
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/** Lowest safe stack virtual address. */
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uintptr_t stack_safe = 0;      
116
 
1 jermar 117
/*
118
 * These two functions prevent stack from underflowing during the
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 * kernel boot phase when SP is set to the very top of the reserved
120
 * space. The stack could get corrupted by a fooled compiler-generated
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 * pop sequence otherwise.
122
 */
123
static void main_bsp_separated_stack(void);
625 palkovsky 124
#ifdef CONFIG_SMP
1 jermar 125
static void main_ap_separated_stack(void);
625 palkovsky 126
#endif
1 jermar 127
 
2048 jermar 128
#define CONFIG_STACK_SIZE   ((1 << STACK_FRAMES) * STACK_SIZE)
1138 jermar 129
 
1229 jermar 130
/** Main kernel routine for bootstrap CPU.
108 decky 131
 *
3175 jermar 132
 * The code here still runs on the boot stack, which knows nothing about
133
 * preemption counts.  Because of that, this function cannot directly call
134
 * functions that disable or enable preemption (e.g. spinlock_lock()). The
135
 * primary task of this function is to calculate address of a new stack and
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 * switch to it.
108 decky 137
 *
413 jermar 138
 * Assuming interrupts_disable().
108 decky 139
 *
1 jermar 140
 */
141
void main_bsp(void)
142
{
143
    config.cpu_count = 1;
144
    config.cpu_active = 1;
651 decky 145
 
369 jermar 146
    config.base = hardcoded_load_address;
2015 jermar 147
    config.kernel_size = ALIGN_UP(hardcoded_ktext_size +
2087 jermar 148
        hardcoded_kdata_size, PAGE_SIZE);
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    config.stack_size = CONFIG_STACK_SIZE;
1037 decky 150
 
1833 decky 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 */
1037 decky 155
    count_t i;
1833 decky 156
    for (i = 0; i < init.cnt; i++) {
2015 jermar 157
        if (PA_overlaps(config.stack_base, config.stack_size,
2087 jermar 158
            init.tasks[i].addr, init.tasks[i].size))
2015 jermar 159
            config.stack_base = ALIGN_UP(init.tasks[i].addr +
2087 jermar 160
                init.tasks[i].size, config.stack_size);
1833 decky 161
    }
1894 jermar 162
 
163
    /* Avoid placing stack on top of boot allocations. */
164
    if (ballocs.size) {
2015 jermar 165
        if (PA_overlaps(config.stack_base, config.stack_size,
2087 jermar 166
            ballocs.base, ballocs.size))
2015 jermar 167
            config.stack_base = ALIGN_UP(ballocs.base +
2087 jermar 168
                ballocs.size, PAGE_SIZE);
1894 jermar 169
    }
1037 decky 170
 
1833 decky 171
    if (config.stack_base < stack_safe)
172
        config.stack_base = ALIGN_UP(stack_safe, PAGE_SIZE);
210 decky 173
 
47 jermar 174
    context_save(&ctx);
2015 jermar 175
    context_set(&ctx, FADDR(main_bsp_separated_stack), config.stack_base,
2087 jermar 176
        THREAD_STACK_SIZE);
47 jermar 177
    context_restore(&ctx);
1 jermar 178
    /* not reached */
179
}
180
 
108 decky 181
 
1229 jermar 182
/** Main kernel routine for bootstrap CPU using new stack.
108 decky 183
 *
184
 * Second part of main_bsp().
185
 *
186
 */
174 jermar 187
void main_bsp_separated_stack(void)
188
{
3175 jermar 189
    /* Keep this the first thing. */
190
    the_initialize(THE);
207 decky 191
 
3175 jermar 192
    version_print();
193
 
194
    LOG("\nconfig.base=%#" PRIp " config.kernel_size=%" PRIs
195
        "\nconfig.stack_base=%#" PRIp " config.stack_size=%" PRIs,
196
        config.base, config.kernel_size, config.stack_base,
197
        config.stack_size);
198
 
4153 mejdrech 199
#ifdef CONFIG_KCONSOLE
517 jermar 200
    /*
201
     * kconsole data structures must be initialized very early
202
     * because other subsystems will register their respective
203
     * commands.
204
     */
3061 decky 205
    LOG_EXEC(kconsole_init());
4153 mejdrech 206
#endif
1037 decky 207
 
756 jermar 208
    /*
209
     * Exception handler initialization, before architecture
673 jermar 210
     * starts adding its own handlers
578 palkovsky 211
     */
3061 decky 212
    LOG_EXEC(exc_init());
4153 mejdrech 213
 
755 jermar 214
    /*
215
     * Memory management subsystems initialization.
3061 decky 216
     */
217
    LOG_EXEC(arch_pre_mm_init());
218
    LOG_EXEC(frame_init());
219
 
2015 jermar 220
    /* Initialize at least 1 memory segment big enough for slab to work. */
3061 decky 221
    LOG_EXEC(slab_cache_init());
222
    LOG_EXEC(btree_init());
223
    LOG_EXEC(as_init());
224
    LOG_EXEC(page_init());
225
    LOG_EXEC(tlb_init());
226
    LOG_EXEC(ddi_init());
227
    LOG_EXEC(tasklet_init());
228
    LOG_EXEC(arch_post_mm_init());
229
    LOG_EXEC(arch_pre_smp_init());
230
    LOG_EXEC(smp_init());
2725 decky 231
 
2015 jermar 232
    /* Slab must be initialized after we know the number of processors. */
3061 decky 233
    LOG_EXEC(slab_enable_cpucache());
2725 decky 234
 
3193 jermar 235
    printf("Detected %" PRIc " CPU(s), %" PRIu64" MiB free memory\n",
236
        config.cpu_count, SIZE2MB(zone_total_size()));
860 decky 237
 
3061 decky 238
    LOG_EXEC(cpu_init());
628 decky 239
 
3061 decky 240
    LOG_EXEC(calibrate_delay_loop());
241
    LOG_EXEC(clock_counter_init());
242
    LOG_EXEC(timeout_init());
243
    LOG_EXEC(scheduler_init());
244
    LOG_EXEC(task_init());
245
    LOG_EXEC(thread_init());
246
    LOG_EXEC(futex_init());
247
 
1826 decky 248
    if (init.cnt > 0) {
3061 decky 249
        count_t i;
1826 decky 250
        for (i = 0; i < init.cnt; i++)
4153 mejdrech 251
            LOG("init[%" PRIc "].addr=%#" PRIp ", init[%" PRIc
3193 jermar 252
                "].size=%#" PRIs "\n", i, init.tasks[i].addr, i,
253
                init.tasks[i].size);
1826 decky 254
    } else
1999 decky 255
        printf("No init binaries found\n");
955 palkovsky 256
 
3061 decky 257
    LOG_EXEC(ipc_init());
3097 decky 258
    LOG_EXEC(klog_init());
4153 mejdrech 259
 
260
#ifdef CONFIG_KCONSOLE
261
    LOG_EXEC(kconsole_notify_init());
262
#endif
263
 
1 jermar 264
    /*
265
     * Create kernel task.
266
     */
3061 decky 267
    task_t *kernel = task_create(AS_KERNEL, "kernel");
268
    if (!kernel)
4153 mejdrech 269
        panic("Cannot create kernel task.");
860 decky 270
 
1 jermar 271
    /*
272
     * Create the first thread.
273
     */
4153 mejdrech 274
    thread_t *kinit_thread
275
        = thread_create(kinit, NULL, kernel, 0, "kinit", true);
3061 decky 276
    if (!kinit_thread)
4153 mejdrech 277
        panic("Cannot create kinit thread.");
3061 decky 278
    LOG_EXEC(thread_ready(kinit_thread));
860 decky 279
 
1 jermar 280
    /*
281
     * This call to scheduler() will return to kinit,
282
     * starting the thread of kernel threads.
283
     */
284
    scheduler();
285
    /* not reached */
286
}
287
 
108 decky 288
 
458 decky 289
#ifdef CONFIG_SMP
1229 jermar 290
/** Main kernel routine for application CPUs.
108 decky 291
 *
292
 * Executed by application processors, temporary stack
1901 jermar 293
 * is at ctx.sp which was set during BSP boot.
675 jermar 294
 * This function passes control directly to
295
 * main_ap_separated_stack().
108 decky 296
 *
413 jermar 297
 * Assuming interrupts_disable()'d.
108 decky 298
 *
1 jermar 299
 */
300
void main_ap(void)
301
{
302
    /*
303
     * Incrementing the active CPU counter will guarantee that the
1901 jermar 304
     * *_init() functions can find out that they need to
305
     * do initialization for AP only.
1 jermar 306
     */
307
    config.cpu_active++;
308
 
192 jermar 309
    /*
310
     * The THE structure is well defined because ctx.sp is used as stack.
311
     */
312
    the_initialize(THE);
298 decky 313
 
26 jermar 314
    arch_pre_mm_init();
1 jermar 315
    frame_init();
316
    page_init();
389 jermar 317
    tlb_init();
26 jermar 318
    arch_post_mm_init();
298 decky 319
 
1 jermar 320
    cpu_init();
321
    calibrate_delay_loop();
1901 jermar 322
    arch_post_cpu_init();
1 jermar 323
 
192 jermar 324
    the_copy(THE, (the_t *) CPU->stack);
1 jermar 325
 
326
    /*
327
     * If we woke kmp up before we left the kernel stack, we could
328
     * collide with another CPU coming up. To prevent this, we
329
     * switch to this cpu's private stack prior to waking kmp up.
330
     */
4153 mejdrech 331
    context_save(&CPU->saved_context);
2015 jermar 332
    context_set(&CPU->saved_context, FADDR(main_ap_separated_stack),
2087 jermar 333
        (uintptr_t) CPU->stack, CPU_STACK_SIZE);
47 jermar 334
    context_restore(&CPU->saved_context);
1 jermar 335
    /* not reached */
336
}
337
 
108 decky 338
 
1229 jermar 339
/** Main kernel routine for application CPUs using new stack.
108 decky 340
 *
341
 * Second part of main_ap().
342
 *
343
 */
1 jermar 344
void main_ap_separated_stack(void)
345
{
346
    /*
347
     * Configure timeouts for this cpu.
348
     */
349
    timeout_init();
350
 
351
    waitq_wakeup(&ap_completion_wq, WAKEUP_FIRST);
352
    scheduler();
353
    /* not reached */
354
}
458 decky 355
#endif /* CONFIG_SMP */
1702 cejka 356
 
1729 decky 357
/** @}
1702 cejka 358
 */