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1 jermar 1
/*
2
 * Copyright (C) 2001-2004 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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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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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * 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
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 * (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.
27
 */
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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().
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 *
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>
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#include <proc/thread.h>
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#include <proc/task.h>
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#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>
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1315 jermar 84
/** Global configuration structure. */
1757 jermar 85
config_t config;
675 jermar 86
 
1315 jermar 87
/** Initial user-space tasks */
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init_t init = {
89
 
90
};
91
 
1894 jermar 92
/** Boot allocations. */
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ballocs_t ballocs = {
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    .base = NULL,
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    .size = 0
96
};
97
 
1 jermar 98
context_t ctx;
99
 
1757 jermar 100
/*
523 jermar 101
 * These 'hardcoded' variables will be intialized by
105 jermar 102
 * the linker or the low level assembler code with
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 * appropriate sizes and addresses.
1 jermar 104
 */
1780 jermar 105
uintptr_t hardcoded_load_address = 0;   /**< Virtual address of where the kernel is loaded. */
1757 jermar 106
size_t hardcoded_ktext_size = 0;    /**< Size of the kernel code in bytes. */
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size_t hardcoded_kdata_size = 0;    /**< Size of the kernel data in bytes. */
1 jermar 108
 
1894 jermar 109
uintptr_t stack_safe = 0;       /**< Lowest safe stack virtual address */
1833 decky 110
 
1 jermar 111
void main_bsp(void);
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void main_ap(void);
113
 
114
/*
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 * 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
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 * space. The stack could get corrupted by a fooled compiler-generated
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 * pop sequence otherwise.
119
 */
120
static void main_bsp_separated_stack(void);
625 palkovsky 121
#ifdef CONFIG_SMP
1 jermar 122
static void main_ap_separated_stack(void);
625 palkovsky 123
#endif
1 jermar 124
 
1138 jermar 125
#define CONFIG_STACK_SIZE   ((1<<STACK_FRAMES)*STACK_SIZE)
126
 
1229 jermar 127
/** Main kernel routine for bootstrap CPU.
108 decky 128
 *
129
 * Initializes the kernel by bootstrap CPU.
675 jermar 130
 * This function passes control directly to
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 * main_bsp_separated_stack().
108 decky 132
 *
413 jermar 133
 * Assuming interrupts_disable().
108 decky 134
 *
1 jermar 135
 */
136
void main_bsp(void)
137
{
138
    config.cpu_count = 1;
139
    config.cpu_active = 1;
651 decky 140
 
369 jermar 141
    config.base = hardcoded_load_address;
142
    config.memory_size = get_memory_size();
210 decky 143
 
814 palkovsky 144
    config.kernel_size = ALIGN_UP(hardcoded_ktext_size + hardcoded_kdata_size, PAGE_SIZE);
1833 decky 145
    config.stack_size = CONFIG_STACK_SIZE;
1037 decky 146
 
1833 decky 147
    /* Initialy the stack is placed just after the kernel */
148
    config.stack_base = config.base + config.kernel_size;
149
 
150
    /* Avoid placing stack on top of init */
1037 decky 151
    count_t i;
1833 decky 152
    for (i = 0; i < init.cnt; i++) {
153
        if (PA_overlaps(config.stack_base, config.stack_size, init.tasks[i].addr, init.tasks[i].size))
154
            config.stack_base = ALIGN_UP(init.tasks[i].addr + init.tasks[i].size, config.stack_size);
155
    }
1894 jermar 156
 
157
    /* Avoid placing stack on top of boot allocations. */
158
    if (ballocs.size) {
159
        if (PA_overlaps(config.stack_base, config.stack_size, ballocs.base, ballocs.size))
160
            config.stack_base = ALIGN_UP(ballocs.base + ballocs.size, PAGE_SIZE);
161
    }
1037 decky 162
 
1833 decky 163
    if (config.stack_base < stack_safe)
164
        config.stack_base = ALIGN_UP(stack_safe, PAGE_SIZE);
210 decky 165
 
47 jermar 166
    context_save(&ctx);
1833 decky 167
    context_set(&ctx, FADDR(main_bsp_separated_stack), config.stack_base, THREAD_STACK_SIZE);
47 jermar 168
    context_restore(&ctx);
1 jermar 169
    /* not reached */
170
}
171
 
108 decky 172
 
1229 jermar 173
/** Main kernel routine for bootstrap CPU using new stack.
108 decky 174
 *
175
 * Second part of main_bsp().
176
 *
177
 */
174 jermar 178
void main_bsp_separated_stack(void)
179
{
1 jermar 180
    task_t *k;
181
    thread_t *t;
1109 jermar 182
    count_t i;
207 decky 183
 
184 jermar 184
    the_initialize(THE);
1109 jermar 185
 
517 jermar 186
    /*
187
     * kconsole data structures must be initialized very early
188
     * because other subsystems will register their respective
189
     * commands.
190
     */
191
    kconsole_init();
1037 decky 192
 
756 jermar 193
    /*
194
     * Exception handler initialization, before architecture
673 jermar 195
     * starts adding its own handlers
578 palkovsky 196
     */
197
    exc_init();
755 jermar 198
 
199
    /*
200
     * Memory management subsystems initialization.
201
     */
26 jermar 202
    arch_pre_mm_init();
1101 jermar 203
    frame_init();       /* Initialize at least 1 memory segment big enough for slab to work */
789 palkovsky 204
    slab_cache_init();
1164 jermar 205
    btree_init();
756 jermar 206
    as_init();
23 jermar 207
    page_init();
208
    tlb_init();
1434 palkovsky 209
    arch_post_mm_init();
1101 jermar 210
 
673 jermar 211
    version_print();
1833 decky 212
    printf("kernel: %.*p hardcoded_ktext_size=%zdK, hardcoded_kdata_size=%zdK\n", sizeof(uintptr_t) * 2, config.base, hardcoded_ktext_size >> 10, hardcoded_kdata_size >> 10);
213
    printf("stack:  %.*p size=%zdK\n", sizeof(uintptr_t) * 2, config.stack_base, config.stack_size >> 10);
1 jermar 214
 
503 jermar 215
    arch_pre_smp_init();
34 jermar 216
    smp_init();
1101 jermar 217
 
218
    slab_enable_cpucache(); /* Slab must be initialized AFTER we know the number of processors */
773 palkovsky 219
 
1389 decky 220
    printf("config.memory_size=%zdM\n", config.memory_size >> 20);
1196 cejka 221
    printf("config.cpu_count=%zd\n", config.cpu_count);
1 jermar 222
    cpu_init();
860 decky 223
 
1 jermar 224
    calibrate_delay_loop();
1434 palkovsky 225
    clock_counter_init();
1 jermar 226
    timeout_init();
227
    scheduler_init();
228
    task_init();
229
    thread_init();
1109 jermar 230
    futex_init();
1595 palkovsky 231
    klog_init();
628 decky 232
 
1826 decky 233
    if (init.cnt > 0) {
234
        for (i = 0; i < init.cnt; i++)
235
            printf("init[%zd].addr=%.*p, init[%zd].size=%zd\n", i, sizeof(uintptr_t) * 2, init.tasks[i].addr, i, init.tasks[i].size);
236
    } else
1999 decky 237
        printf("No init binaries found\n");
955 palkovsky 238
 
239
    ipc_init();
1109 jermar 240
 
1 jermar 241
    /*
242
     * Create kernel task.
243
     */
1062 jermar 244
    k = task_create(AS_KERNEL, "KERNEL");
210 decky 245
    if (!k)
246
        panic("can't create kernel task\n");
860 decky 247
 
1 jermar 248
    /*
249
     * Create the first thread.
250
     */
1062 jermar 251
    t = thread_create(kinit, NULL, k, 0, "kinit");
210 decky 252
    if (!t)
253
        panic("can't create kinit thread\n");
1 jermar 254
    thread_ready(t);
860 decky 255
 
1 jermar 256
    /*
257
     * This call to scheduler() will return to kinit,
258
     * starting the thread of kernel threads.
259
     */
260
    scheduler();
261
    /* not reached */
262
}
263
 
108 decky 264
 
458 decky 265
#ifdef CONFIG_SMP
1229 jermar 266
/** Main kernel routine for application CPUs.
108 decky 267
 *
268
 * Executed by application processors, temporary stack
1901 jermar 269
 * is at ctx.sp which was set during BSP boot.
675 jermar 270
 * This function passes control directly to
271
 * main_ap_separated_stack().
108 decky 272
 *
413 jermar 273
 * Assuming interrupts_disable()'d.
108 decky 274
 *
1 jermar 275
 */
276
void main_ap(void)
277
{
278
    /*
279
     * Incrementing the active CPU counter will guarantee that the
1901 jermar 280
     * *_init() functions can find out that they need to
281
     * do initialization for AP only.
1 jermar 282
     */
283
    config.cpu_active++;
284
 
192 jermar 285
    /*
286
     * The THE structure is well defined because ctx.sp is used as stack.
287
     */
288
    the_initialize(THE);
298 decky 289
 
26 jermar 290
    arch_pre_mm_init();
1 jermar 291
    frame_init();
292
    page_init();
389 jermar 293
    tlb_init();
26 jermar 294
    arch_post_mm_init();
298 decky 295
 
1 jermar 296
    cpu_init();
297
    calibrate_delay_loop();
1901 jermar 298
    arch_post_cpu_init();
1 jermar 299
 
192 jermar 300
    the_copy(THE, (the_t *) CPU->stack);
1 jermar 301
 
302
    /*
303
     * If we woke kmp up before we left the kernel stack, we could
304
     * collide with another CPU coming up. To prevent this, we
305
     * switch to this cpu's private stack prior to waking kmp up.
306
     */
1780 jermar 307
    context_set(&CPU->saved_context, FADDR(main_ap_separated_stack), (uintptr_t) CPU->stack, CPU_STACK_SIZE);
47 jermar 308
    context_restore(&CPU->saved_context);
1 jermar 309
    /* not reached */
310
}
311
 
108 decky 312
 
1229 jermar 313
/** Main kernel routine for application CPUs using new stack.
108 decky 314
 *
315
 * Second part of main_ap().
316
 *
317
 */
1 jermar 318
void main_ap_separated_stack(void)
319
{
320
    /*
321
     * Configure timeouts for this cpu.
322
     */
323
    timeout_init();
324
 
325
    waitq_wakeup(&ap_completion_wq, WAKEUP_FIRST);
326
    scheduler();
327
    /* not reached */
328
}
458 decky 329
#endif /* CONFIG_SMP */
1702 cejka 330
 
1729 decky 331
/** @}
1702 cejka 332
 */