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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.
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 * - 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
 
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>
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>
675 jermar 84
 
3193 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
 
2746 decky 108
/**< Virtual address of where the kernel is loaded. */
109
uintptr_t hardcoded_load_address = 0;
110
/**< Size of the kernel code in bytes. */
111
size_t hardcoded_ktext_size = 0;
112
/**< Size of the kernel data in bytes. */
113
size_t hardcoded_kdata_size = 0;
114
/**< Lowest safe stack virtual address. */
115
uintptr_t stack_safe = 0;      
116
 
1 jermar 117
void main_bsp(void);
118
void main_ap(void);
119
 
120
/*
121
 * These two functions prevent stack from underflowing during the
122
 * kernel boot phase when SP is set to the very top of the reserved
123
 * space. The stack could get corrupted by a fooled compiler-generated
124
 * pop sequence otherwise.
125
 */
126
static void main_bsp_separated_stack(void);
625 palkovsky 127
#ifdef CONFIG_SMP
1 jermar 128
static void main_ap_separated_stack(void);
625 palkovsky 129
#endif
1 jermar 130
 
2048 jermar 131
#define CONFIG_STACK_SIZE   ((1 << STACK_FRAMES) * STACK_SIZE)
1138 jermar 132
 
1229 jermar 133
/** Main kernel routine for bootstrap CPU.
108 decky 134
 *
3175 jermar 135
 * The code here still runs on the boot stack, which knows nothing about
136
 * preemption counts.  Because of that, this function cannot directly call
137
 * functions that disable or enable preemption (e.g. spinlock_lock()). The
138
 * primary task of this function is to calculate address of a new stack and
139
 * switch to it.
108 decky 140
 *
413 jermar 141
 * Assuming interrupts_disable().
108 decky 142
 *
1 jermar 143
 */
144
void main_bsp(void)
145
{
146
    config.cpu_count = 1;
147
    config.cpu_active = 1;
651 decky 148
 
369 jermar 149
    config.base = hardcoded_load_address;
2015 jermar 150
    config.kernel_size = ALIGN_UP(hardcoded_ktext_size +
2087 jermar 151
        hardcoded_kdata_size, PAGE_SIZE);
1833 decky 152
    config.stack_size = CONFIG_STACK_SIZE;
1037 decky 153
 
1833 decky 154
    /* Initialy the stack is placed just after the kernel */
155
    config.stack_base = config.base + config.kernel_size;
156
 
157
    /* Avoid placing stack on top of init */
1037 decky 158
    count_t i;
1833 decky 159
    for (i = 0; i < init.cnt; i++) {
2015 jermar 160
        if (PA_overlaps(config.stack_base, config.stack_size,
2087 jermar 161
            init.tasks[i].addr, init.tasks[i].size))
2015 jermar 162
            config.stack_base = ALIGN_UP(init.tasks[i].addr +
2087 jermar 163
                init.tasks[i].size, config.stack_size);
1833 decky 164
    }
1894 jermar 165
 
166
    /* Avoid placing stack on top of boot allocations. */
167
    if (ballocs.size) {
2015 jermar 168
        if (PA_overlaps(config.stack_base, config.stack_size,
2087 jermar 169
            ballocs.base, ballocs.size))
2015 jermar 170
            config.stack_base = ALIGN_UP(ballocs.base +
2087 jermar 171
                ballocs.size, PAGE_SIZE);
1894 jermar 172
    }
1037 decky 173
 
1833 decky 174
    if (config.stack_base < stack_safe)
175
        config.stack_base = ALIGN_UP(stack_safe, PAGE_SIZE);
3770 rimsky 176
 
47 jermar 177
    context_save(&ctx);
2015 jermar 178
    context_set(&ctx, FADDR(main_bsp_separated_stack), config.stack_base,
2087 jermar 179
        THREAD_STACK_SIZE);
47 jermar 180
    context_restore(&ctx);
1 jermar 181
    /* not reached */
182
}
183
 
108 decky 184
 
1229 jermar 185
/** Main kernel routine for bootstrap CPU using new stack.
108 decky 186
 *
187
 * Second part of main_bsp().
188
 *
189
 */
174 jermar 190
void main_bsp_separated_stack(void)
191
{
3175 jermar 192
    /* Keep this the first thing. */
193
    the_initialize(THE);
207 decky 194
 
3175 jermar 195
    version_print();
196
 
197
    LOG("\nconfig.base=%#" PRIp " config.kernel_size=%" PRIs
198
        "\nconfig.stack_base=%#" PRIp " config.stack_size=%" PRIs,
199
        config.base, config.kernel_size, config.stack_base,
200
        config.stack_size);
1109 jermar 201
 
3742 rimsky 202
#ifdef CONFIG_KCONSOLE
517 jermar 203
    /*
204
     * kconsole data structures must be initialized very early
205
     * because other subsystems will register their respective
206
     * commands.
207
     */
3061 decky 208
    LOG_EXEC(kconsole_init());
3742 rimsky 209
#endif
1037 decky 210
 
756 jermar 211
    /*
212
     * Exception handler initialization, before architecture
673 jermar 213
     * starts adding its own handlers
578 palkovsky 214
     */
3061 decky 215
    LOG_EXEC(exc_init());
755 jermar 216
 
217
    /*
218
     * Memory management subsystems initialization.
3061 decky 219
     */
220
    LOG_EXEC(arch_pre_mm_init());
221
    LOG_EXEC(frame_init());
222
 
2015 jermar 223
    /* Initialize at least 1 memory segment big enough for slab to work. */
3061 decky 224
    LOG_EXEC(slab_cache_init());
225
    LOG_EXEC(btree_init());
226
    LOG_EXEC(as_init());
227
    LOG_EXEC(page_init());
228
    LOG_EXEC(tlb_init());
229
    LOG_EXEC(ddi_init());
230
    LOG_EXEC(tasklet_init());
231
    LOG_EXEC(arch_post_mm_init());
232
    LOG_EXEC(arch_pre_smp_init());
233
    LOG_EXEC(smp_init());
2725 decky 234
 
2015 jermar 235
    /* Slab must be initialized after we know the number of processors. */
3061 decky 236
    LOG_EXEC(slab_enable_cpucache());
2725 decky 237
 
3193 jermar 238
    printf("Detected %" PRIc " CPU(s), %" PRIu64" MiB free memory\n",
239
        config.cpu_count, SIZE2MB(zone_total_size()));
860 decky 240
 
3061 decky 241
    LOG_EXEC(cpu_init());
628 decky 242
 
3061 decky 243
    LOG_EXEC(calibrate_delay_loop());
244
    LOG_EXEC(clock_counter_init());
245
    LOG_EXEC(timeout_init());
246
    LOG_EXEC(scheduler_init());
247
    LOG_EXEC(task_init());
248
    LOG_EXEC(thread_init());
249
    LOG_EXEC(futex_init());
250
 
1826 decky 251
    if (init.cnt > 0) {
3061 decky 252
        count_t i;
1826 decky 253
        for (i = 0; i < init.cnt; i++)
3742 rimsky 254
            LOG("init[%" PRIc "].addr=%#" PRIp ", init[%" PRIc
3193 jermar 255
                "].size=%#" PRIs "\n", i, init.tasks[i].addr, i,
256
                init.tasks[i].size);
1826 decky 257
    } else
1999 decky 258
        printf("No init binaries found\n");
955 palkovsky 259
 
3061 decky 260
    LOG_EXEC(ipc_init());
3097 decky 261
    LOG_EXEC(klog_init());
1109 jermar 262
 
1 jermar 263
    /*
264
     * Create kernel task.
265
     */
3061 decky 266
    task_t *kernel = task_create(AS_KERNEL, "kernel");
267
    if (!kernel)
268
        panic("Can't create kernel task\n");
860 decky 269
 
1 jermar 270
    /*
271
     * Create the first thread.
272
     */
3742 rimsky 273
    thread_t *kinit_thread
274
        = thread_create(kinit, NULL, kernel, 0, "kinit", true);
3061 decky 275
    if (!kinit_thread)
276
        panic("Can't create kinit thread\n");
277
    LOG_EXEC(thread_ready(kinit_thread));
3798 rimsky 278
 
1 jermar 279
    /*
280
     * This call to scheduler() will return to kinit,
281
     * starting the thread of kernel threads.
282
     */
283
    scheduler();
284
    /* not reached */
285
}
286
 
108 decky 287
 
458 decky 288
#ifdef CONFIG_SMP
1229 jermar 289
/** Main kernel routine for application CPUs.
108 decky 290
 *
291
 * Executed by application processors, temporary stack
1901 jermar 292
 * is at ctx.sp which was set during BSP boot.
675 jermar 293
 * This function passes control directly to
294
 * main_ap_separated_stack().
108 decky 295
 *
413 jermar 296
 * Assuming interrupts_disable()'d.
108 decky 297
 *
1 jermar 298
 */
299
void main_ap(void)
300
{
301
    /*
302
     * Incrementing the active CPU counter will guarantee that the
1901 jermar 303
     * *_init() functions can find out that they need to
304
     * do initialization for AP only.
1 jermar 305
     */
306
    config.cpu_active++;
307
 
192 jermar 308
    /*
309
     * The THE structure is well defined because ctx.sp is used as stack.
310
     */
311
    the_initialize(THE);
298 decky 312
 
26 jermar 313
    arch_pre_mm_init();
1 jermar 314
    frame_init();
315
    page_init();
389 jermar 316
    tlb_init();
26 jermar 317
    arch_post_mm_init();
298 decky 318
 
1 jermar 319
    cpu_init();
320
    calibrate_delay_loop();
1901 jermar 321
    arch_post_cpu_init();
1 jermar 322
 
192 jermar 323
    the_copy(THE, (the_t *) CPU->stack);
1 jermar 324
 
325
    /*
326
     * If we woke kmp up before we left the kernel stack, we could
327
     * collide with another CPU coming up. To prevent this, we
328
     * switch to this cpu's private stack prior to waking kmp up.
329
     */
3593 rimsky 330
    context_save(&CPU->saved_context);
2015 jermar 331
    context_set(&CPU->saved_context, FADDR(main_ap_separated_stack),
2087 jermar 332
        (uintptr_t) CPU->stack, CPU_STACK_SIZE);
47 jermar 333
    context_restore(&CPU->saved_context);
1 jermar 334
    /* not reached */
335
}
336
 
108 decky 337
 
1229 jermar 338
/** Main kernel routine for application CPUs using new stack.
108 decky 339
 *
340
 * Second part of main_ap().
341
 *
342
 */
1 jermar 343
void main_ap_separated_stack(void)
344
{
345
    /*
346
     * Configure timeouts for this cpu.
347
     */
348
    timeout_init();
349
 
350
    waitq_wakeup(&ap_completion_wq, WAKEUP_FIRST);
351
    scheduler();
352
    /* not reached */
353
}
458 decky 354
#endif /* CONFIG_SMP */
1702 cejka 355
 
1729 decky 356
/** @}
1702 cejka 357
 */