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1 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2001-2004 Jakub Jermar
1 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
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 *   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
 
1729 decky 29
/** @addtogroup main
1702 cejka 30
 * @{
31
 */
32
 
1248 jermar 33
/**
1702 cejka 34
 * @file
4296 trochtova 35
 * @brief Main initialization kernel function for all processors.
1248 jermar 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>
4055 trochtova 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>
1 jermar 77
#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>
675 jermar 82
#include <smp/smp.h>
2015 jermar 83
#include <ddi/ddi.h>
4055 trochtova 84
#include <main/main.h>
4296 trochtova 85
#include <ipc/event.h>
675 jermar 86
 
1315 jermar 87
/** Global configuration structure. */
1757 jermar 88
config_t config;
675 jermar 89
 
1315 jermar 90
/** Initial user-space tasks */
91
init_t init = {
2745 decky 92
    .cnt = 0
1315 jermar 93
};
94
 
1894 jermar 95
/** Boot allocations. */
96
ballocs_t ballocs = {
97
    .base = NULL,
98
    .size = 0
99
};
100
 
1 jermar 101
context_t ctx;
102
 
1757 jermar 103
/*
523 jermar 104
 * These 'hardcoded' variables will be intialized by
105 jermar 105
 * the linker or the low level assembler code with
106
 * appropriate sizes and addresses.
1 jermar 107
 */
108
 
4055 trochtova 109
/** Virtual address of where the kernel is loaded. */
2746 decky 110
uintptr_t hardcoded_load_address = 0;
4055 trochtova 111
/** Size of the kernel code in bytes. */
2746 decky 112
size_t hardcoded_ktext_size = 0;
4055 trochtova 113
/** Size of the kernel data in bytes. */
2746 decky 114
size_t hardcoded_kdata_size = 0;
4055 trochtova 115
/** Lowest safe stack virtual address. */
2746 decky 116
uintptr_t stack_safe = 0;      
117
 
1 jermar 118
/*
119
 * These two functions prevent stack from underflowing during the
120
 * kernel boot phase when SP is set to the very top of the reserved
121
 * space. The stack could get corrupted by a fooled compiler-generated
122
 * pop sequence otherwise.
123
 */
124
static void main_bsp_separated_stack(void);
625 palkovsky 125
#ifdef CONFIG_SMP
1 jermar 126
static void main_ap_separated_stack(void);
625 palkovsky 127
#endif
1 jermar 128
 
2048 jermar 129
#define CONFIG_STACK_SIZE   ((1 << STACK_FRAMES) * STACK_SIZE)
1138 jermar 130
 
1229 jermar 131
/** Main kernel routine for bootstrap CPU.
108 decky 132
 *
4055 trochtova 133
 * The code here still runs on the boot stack, which knows nothing about
134
 * preemption counts.  Because of that, this function cannot directly call
135
 * functions that disable or enable preemption (e.g. spinlock_lock()). The
136
 * primary task of this function is to calculate address of a new stack and
137
 * switch to it.
108 decky 138
 *
413 jermar 139
 * Assuming interrupts_disable().
108 decky 140
 *
1 jermar 141
 */
142
void main_bsp(void)
143
{
144
    config.cpu_count = 1;
145
    config.cpu_active = 1;
651 decky 146
 
369 jermar 147
    config.base = hardcoded_load_address;
2015 jermar 148
    config.kernel_size = ALIGN_UP(hardcoded_ktext_size +
2087 jermar 149
        hardcoded_kdata_size, PAGE_SIZE);
1833 decky 150
    config.stack_size = CONFIG_STACK_SIZE;
1037 decky 151
 
1833 decky 152
    /* Initialy the stack is placed just after the kernel */
153
    config.stack_base = config.base + config.kernel_size;
154
 
155
    /* Avoid placing stack on top of init */
4537 trochtova 156
    size_t i;
1833 decky 157
    for (i = 0; i < init.cnt; i++) {
2015 jermar 158
        if (PA_overlaps(config.stack_base, config.stack_size,
2087 jermar 159
            init.tasks[i].addr, init.tasks[i].size))
2015 jermar 160
            config.stack_base = ALIGN_UP(init.tasks[i].addr +
2087 jermar 161
                init.tasks[i].size, config.stack_size);
1833 decky 162
    }
1894 jermar 163
 
164
    /* Avoid placing stack on top of boot allocations. */
165
    if (ballocs.size) {
2015 jermar 166
        if (PA_overlaps(config.stack_base, config.stack_size,
2087 jermar 167
            ballocs.base, ballocs.size))
2015 jermar 168
            config.stack_base = ALIGN_UP(ballocs.base +
2087 jermar 169
                ballocs.size, PAGE_SIZE);
1894 jermar 170
    }
1037 decky 171
 
1833 decky 172
    if (config.stack_base < stack_safe)
173
        config.stack_base = ALIGN_UP(stack_safe, PAGE_SIZE);
210 decky 174
 
47 jermar 175
    context_save(&ctx);
2015 jermar 176
    context_set(&ctx, FADDR(main_bsp_separated_stack), config.stack_base,
2087 jermar 177
        THREAD_STACK_SIZE);
47 jermar 178
    context_restore(&ctx);
1 jermar 179
    /* not reached */
180
}
181
 
108 decky 182
 
1229 jermar 183
/** Main kernel routine for bootstrap CPU using new stack.
108 decky 184
 *
185
 * Second part of main_bsp().
186
 *
187
 */
174 jermar 188
void main_bsp_separated_stack(void)
189
{
4055 trochtova 190
    /* Keep this the first thing. */
191
    the_initialize(THE);
207 decky 192
 
4055 trochtova 193
    version_print();
194
 
195
    LOG("\nconfig.base=%#" PRIp " config.kernel_size=%" PRIs
196
        "\nconfig.stack_base=%#" PRIp " config.stack_size=%" PRIs,
197
        config.base, config.kernel_size, config.stack_base,
198
        config.stack_size);
199
 
200
#ifdef CONFIG_KCONSOLE
517 jermar 201
    /*
202
     * kconsole data structures must be initialized very early
203
     * because other subsystems will register their respective
204
     * commands.
205
     */
4055 trochtova 206
    LOG_EXEC(kconsole_init());
207
#endif
1037 decky 208
 
756 jermar 209
    /*
210
     * Exception handler initialization, before architecture
673 jermar 211
     * starts adding its own handlers
578 palkovsky 212
     */
4055 trochtova 213
    LOG_EXEC(exc_init());
214
 
755 jermar 215
    /*
216
     * Memory management subsystems initialization.
4055 trochtova 217
     */
218
    LOG_EXEC(arch_pre_mm_init());
219
    LOG_EXEC(frame_init());
220
 
2015 jermar 221
    /* Initialize at least 1 memory segment big enough for slab to work. */
4055 trochtova 222
    LOG_EXEC(slab_cache_init());
223
    LOG_EXEC(btree_init());
224
    LOG_EXEC(as_init());
225
    LOG_EXEC(page_init());
226
    LOG_EXEC(tlb_init());
227
    LOG_EXEC(ddi_init());
228
    LOG_EXEC(tasklet_init());
229
    LOG_EXEC(arch_post_mm_init());
230
    LOG_EXEC(arch_pre_smp_init());
231
    LOG_EXEC(smp_init());
2725 decky 232
 
2015 jermar 233
    /* Slab must be initialized after we know the number of processors. */
4055 trochtova 234
    LOG_EXEC(slab_enable_cpucache());
2725 decky 235
 
4537 trochtova 236
    printf("Detected %" PRIs " CPU(s), %" PRIu64" MiB free memory\n",
4055 trochtova 237
        config.cpu_count, SIZE2MB(zone_total_size()));
860 decky 238
 
4055 trochtova 239
    LOG_EXEC(cpu_init());
628 decky 240
 
4055 trochtova 241
    LOG_EXEC(calibrate_delay_loop());
242
    LOG_EXEC(clock_counter_init());
243
    LOG_EXEC(timeout_init());
244
    LOG_EXEC(scheduler_init());
245
    LOG_EXEC(task_init());
246
    LOG_EXEC(thread_init());
247
    LOG_EXEC(futex_init());
248
 
1826 decky 249
    if (init.cnt > 0) {
4537 trochtova 250
        size_t i;
1826 decky 251
        for (i = 0; i < init.cnt; i++)
4537 trochtova 252
            LOG("init[%" PRIs "].addr=%#" PRIp ", init[%" PRIs
4420 trochtova 253
                "].size=%#" PRIs, i, init.tasks[i].addr, i,
2087 jermar 254
                init.tasks[i].size);
1826 decky 255
    } else
4420 trochtova 256
        printf("No init binaries found.\n");
955 palkovsky 257
 
4055 trochtova 258
    LOG_EXEC(ipc_init());
4201 trochtova 259
    LOG_EXEC(event_init());
4055 trochtova 260
    LOG_EXEC(klog_init());
261
 
1 jermar 262
    /*
263
     * Create kernel task.
264
     */
4055 trochtova 265
    task_t *kernel = task_create(AS_KERNEL, "kernel");
266
    if (!kernel)
267
        panic("Cannot create kernel task.");
860 decky 268
 
1 jermar 269
    /*
270
     * Create the first thread.
271
     */
4055 trochtova 272
    thread_t *kinit_thread
273
        = thread_create(kinit, NULL, kernel, 0, "kinit", true);
274
    if (!kinit_thread)
275
        panic("Cannot create kinit thread.");
276
    LOG_EXEC(thread_ready(kinit_thread));
860 decky 277
 
1 jermar 278
    /*
279
     * This call to scheduler() will return to kinit,
280
     * starting the thread of kernel threads.
281
     */
282
    scheduler();
283
    /* not reached */
284
}
285
 
108 decky 286
 
458 decky 287
#ifdef CONFIG_SMP
1229 jermar 288
/** Main kernel routine for application CPUs.
108 decky 289
 *
290
 * Executed by application processors, temporary stack
1901 jermar 291
 * is at ctx.sp which was set during BSP boot.
675 jermar 292
 * This function passes control directly to
293
 * main_ap_separated_stack().
108 decky 294
 *
413 jermar 295
 * Assuming interrupts_disable()'d.
108 decky 296
 *
1 jermar 297
 */
298
void main_ap(void)
299
{
300
    /*
301
     * Incrementing the active CPU counter will guarantee that the
1901 jermar 302
     * *_init() functions can find out that they need to
303
     * do initialization for AP only.
1 jermar 304
     */
305
    config.cpu_active++;
306
 
192 jermar 307
    /*
308
     * The THE structure is well defined because ctx.sp is used as stack.
309
     */
310
    the_initialize(THE);
298 decky 311
 
26 jermar 312
    arch_pre_mm_init();
1 jermar 313
    frame_init();
314
    page_init();
389 jermar 315
    tlb_init();
26 jermar 316
    arch_post_mm_init();
298 decky 317
 
1 jermar 318
    cpu_init();
319
    calibrate_delay_loop();
1901 jermar 320
    arch_post_cpu_init();
1 jermar 321
 
192 jermar 322
    the_copy(THE, (the_t *) CPU->stack);
1 jermar 323
 
324
    /*
325
     * If we woke kmp up before we left the kernel stack, we could
326
     * collide with another CPU coming up. To prevent this, we
327
     * switch to this cpu's private stack prior to waking kmp up.
328
     */
4055 trochtova 329
    context_save(&CPU->saved_context);
2015 jermar 330
    context_set(&CPU->saved_context, FADDR(main_ap_separated_stack),
2087 jermar 331
        (uintptr_t) CPU->stack, CPU_STACK_SIZE);
47 jermar 332
    context_restore(&CPU->saved_context);
1 jermar 333
    /* not reached */
334
}
335
 
108 decky 336
 
1229 jermar 337
/** Main kernel routine for application CPUs using new stack.
108 decky 338
 *
339
 * Second part of main_ap().
340
 *
341
 */
1 jermar 342
void main_ap_separated_stack(void)
343
{
344
    /*
345
     * Configure timeouts for this cpu.
346
     */
347
    timeout_init();
348
 
349
    waitq_wakeup(&ap_completion_wq, WAKEUP_FIRST);
350
    scheduler();
351
    /* not reached */
352
}
458 decky 353
#endif /* CONFIG_SMP */
1702 cejka 354
 
1729 decky 355
/** @}
1702 cejka 356
 */