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1 jermar 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
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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.
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
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 * 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>
56
#include <proc/scheduler.h>
57
#include <proc/thread.h>
58
#include <proc/task.h>
59
#include <main/kinit.h>
675 jermar 60
#include <main/version.h>
518 jermar 61
#include <console/kconsole.h>
1 jermar 62
#include <cpu.h>
402 jermar 63
#include <align.h>
578 palkovsky 64
#include <interrupt.h>
146 cejka 65
#include <arch/mm/memory_init.h>
1 jermar 66
#include <mm/frame.h>
67
#include <mm/page.h>
684 jermar 68
#include <genarch/mm/page_pt.h>
5 jermar 69
#include <mm/tlb.h>
703 jermar 70
#include <mm/as.h>
759 palkovsky 71
#include <mm/slab.h>
1 jermar 72
#include <synch/waitq.h>
1109 jermar 73
#include <synch/futex.h>
210 decky 74
#include <arch/arch.h>
1 jermar 75
#include <arch.h>
76 jermar 76
#include <arch/faddr.h>
106 jermar 77
#include <typedefs.h>
955 palkovsky 78
#include <ipc/ipc.h>
1063 palkovsky 79
#include <macros.h>
1164 jermar 80
#include <adt/btree.h>
1595 palkovsky 81
#include <console/klog.h>
675 jermar 82
#include <smp/smp.h>
2015 jermar 83
#include <ddi/ddi.h>
675 jermar 84
 
1315 jermar 85
/** Global configuration structure. */
1757 jermar 86
config_t config;
675 jermar 87
 
1315 jermar 88
/** Initial user-space tasks */
89
init_t init = {
90
 
91
};
92
 
1894 jermar 93
/** Boot allocations. */
94
ballocs_t ballocs = {
95
    .base = NULL,
96
    .size = 0
97
};
98
 
1 jermar 99
context_t ctx;
100
 
1757 jermar 101
/*
523 jermar 102
 * These 'hardcoded' variables will be intialized by
105 jermar 103
 * the linker or the low level assembler code with
104
 * appropriate sizes and addresses.
1 jermar 105
 */
2015 jermar 106
uintptr_t hardcoded_load_address = 0;   /**< Virtual address of where the kernel
107
                      *  is loaded. */
108
size_t hardcoded_ktext_size = 0;    /**< Size of the kernel code in bytes.
109
                      */
110
size_t hardcoded_kdata_size = 0;    /**< Size of the kernel data in bytes.
111
                     */
112
uintptr_t stack_safe = 0;       /**< Lowest safe stack virtual address.
113
                      */
1 jermar 114
 
115
void main_bsp(void);
116
void main_ap(void);
117
 
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
 *
133
 * Initializes the kernel by bootstrap CPU.
675 jermar 134
 * This function passes control directly to
135
 * main_bsp_separated_stack().
108 decky 136
 *
413 jermar 137
 * Assuming interrupts_disable().
108 decky 138
 *
1 jermar 139
 */
140
void main_bsp(void)
141
{
142
    config.cpu_count = 1;
143
    config.cpu_active = 1;
651 decky 144
 
369 jermar 145
    config.base = hardcoded_load_address;
146
    config.memory_size = get_memory_size();
210 decky 147
 
2015 jermar 148
    config.kernel_size = ALIGN_UP(hardcoded_ktext_size +
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 */
1037 decky 156
    count_t i;
1833 decky 157
    for (i = 0; i < init.cnt; i++) {
2015 jermar 158
        if (PA_overlaps(config.stack_base, config.stack_size,
159
            init.tasks[i].addr, init.tasks[i].size))
160
            config.stack_base = ALIGN_UP(init.tasks[i].addr +
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,
167
            ballocs.base, ballocs.size))
168
            config.stack_base = ALIGN_UP(ballocs.base +
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,
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
{
1 jermar 190
    task_t *k;
191
    thread_t *t;
1109 jermar 192
    count_t i;
207 decky 193
 
184 jermar 194
    the_initialize(THE);
1109 jermar 195
 
517 jermar 196
    /*
197
     * kconsole data structures must be initialized very early
198
     * because other subsystems will register their respective
199
     * commands.
200
     */
201
    kconsole_init();
1037 decky 202
 
756 jermar 203
    /*
204
     * Exception handler initialization, before architecture
673 jermar 205
     * starts adding its own handlers
578 palkovsky 206
     */
207
    exc_init();
755 jermar 208
 
209
    /*
210
     * Memory management subsystems initialization.
211
     */
26 jermar 212
    arch_pre_mm_init();
2015 jermar 213
    frame_init();      
214
    /* Initialize at least 1 memory segment big enough for slab to work. */
789 palkovsky 215
    slab_cache_init();
1164 jermar 216
    btree_init();
756 jermar 217
    as_init();
23 jermar 218
    page_init();
219
    tlb_init();
2015 jermar 220
    ddi_init();
1434 palkovsky 221
    arch_post_mm_init();
1101 jermar 222
 
673 jermar 223
    version_print();
2015 jermar 224
    printf("kernel: %.*p hardcoded_ktext_size=%zdK, "
225
        "hardcoded_kdata_size=%zdK\n", sizeof(uintptr_t) * 2,
226
        config.base, hardcoded_ktext_size >> 10, hardcoded_kdata_size >>
227
        10);
228
    printf("stack:  %.*p size=%zdK\n", sizeof(uintptr_t) * 2,
229
        config.stack_base, config.stack_size >> 10);
1 jermar 230
 
503 jermar 231
    arch_pre_smp_init();
34 jermar 232
    smp_init();
2015 jermar 233
    /* Slab must be initialized after we know the number of processors. */
234
    slab_enable_cpucache();
773 palkovsky 235
 
1389 decky 236
    printf("config.memory_size=%zdM\n", config.memory_size >> 20);
1196 cejka 237
    printf("config.cpu_count=%zd\n", config.cpu_count);
1 jermar 238
    cpu_init();
860 decky 239
 
1 jermar 240
    calibrate_delay_loop();
1434 palkovsky 241
    clock_counter_init();
1 jermar 242
    timeout_init();
243
    scheduler_init();
244
    task_init();
245
    thread_init();
1109 jermar 246
    futex_init();
1595 palkovsky 247
    klog_init();
628 decky 248
 
1826 decky 249
    if (init.cnt > 0) {
250
        for (i = 0; i < init.cnt; i++)
2015 jermar 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);
1826 decky 254
    } else
1999 decky 255
        printf("No init binaries found\n");
955 palkovsky 256
 
257
    ipc_init();
1109 jermar 258
 
1 jermar 259
    /*
260
     * Create kernel task.
261
     */
2039 decky 262
    k = task_create(AS_KERNEL, "kernel");
210 decky 263
    if (!k)
264
        panic("can't create kernel task\n");
860 decky 265
 
1 jermar 266
    /*
267
     * Create the first thread.
268
     */
2042 decky 269
    t = thread_create(kinit, NULL, k, 0, "kinit", true);
210 decky 270
    if (!t)
271
        panic("can't create kinit thread\n");
1 jermar 272
    thread_ready(t);
860 decky 273
 
1 jermar 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
 
108 decky 282
 
458 decky 283
#ifdef CONFIG_SMP
1229 jermar 284
/** Main kernel routine for application CPUs.
108 decky 285
 *
286
 * Executed by application processors, temporary stack
1901 jermar 287
 * is at ctx.sp which was set during BSP boot.
675 jermar 288
 * This function passes control directly to
289
 * main_ap_separated_stack().
108 decky 290
 *
413 jermar 291
 * Assuming interrupts_disable()'d.
108 decky 292
 *
1 jermar 293
 */
294
void main_ap(void)
295
{
296
    /*
297
     * Incrementing the active CPU counter will guarantee that the
1901 jermar 298
     * *_init() functions can find out that they need to
299
     * do initialization for AP only.
1 jermar 300
     */
301
    config.cpu_active++;
302
 
192 jermar 303
    /*
304
     * The THE structure is well defined because ctx.sp is used as stack.
305
     */
306
    the_initialize(THE);
298 decky 307
 
26 jermar 308
    arch_pre_mm_init();
1 jermar 309
    frame_init();
310
    page_init();
389 jermar 311
    tlb_init();
26 jermar 312
    arch_post_mm_init();
298 decky 313
 
1 jermar 314
    cpu_init();
315
    calibrate_delay_loop();
1901 jermar 316
    arch_post_cpu_init();
1 jermar 317
 
192 jermar 318
    the_copy(THE, (the_t *) CPU->stack);
1 jermar 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
     */
2015 jermar 325
    context_set(&CPU->saved_context, FADDR(main_ap_separated_stack),
326
        (uintptr_t) CPU->stack, CPU_STACK_SIZE);
47 jermar 327
    context_restore(&CPU->saved_context);
1 jermar 328
    /* not reached */
329
}
330
 
108 decky 331
 
1229 jermar 332
/** Main kernel routine for application CPUs using new stack.
108 decky 333
 *
334
 * Second part of main_ap().
335
 *
336
 */
1 jermar 337
void 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
}
458 decky 348
#endif /* CONFIG_SMP */
1702 cejka 349
 
1729 decky 350
/** @}
1702 cejka 351
 */