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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
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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
15
 *   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.
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>
60
#include <main/kinit.h>
675 jermar 61
#include <main/version.h>
518 jermar 62
#include <console/kconsole.h>
1 jermar 63
#include <cpu.h>
402 jermar 64
#include <align.h>
578 palkovsky 65
#include <interrupt.h>
146 cejka 66
#include <arch/mm/memory_init.h>
1 jermar 67
#include <mm/frame.h>
68
#include <mm/page.h>
684 jermar 69
#include <genarch/mm/page_pt.h>
5 jermar 70
#include <mm/tlb.h>
703 jermar 71
#include <mm/as.h>
759 palkovsky 72
#include <mm/slab.h>
1 jermar 73
#include <synch/waitq.h>
1109 jermar 74
#include <synch/futex.h>
210 decky 75
#include <arch/arch.h>
1 jermar 76
#include <arch.h>
76 jermar 77
#include <arch/faddr.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>
2265 hudecek 84
#include <proc/tasklet.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 = {
91
 
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
 */
2015 jermar 107
uintptr_t hardcoded_load_address = 0;   /**< Virtual address of where the kernel
108
                      *  is loaded. */
109
size_t hardcoded_ktext_size = 0;    /**< Size of the kernel code in bytes.
110
                      */
111
size_t hardcoded_kdata_size = 0;    /**< Size of the kernel data in bytes.
112
                     */
113
uintptr_t stack_safe = 0;       /**< Lowest safe stack virtual address.
114
                      */
1 jermar 115
 
116
void main_bsp(void);
117
void main_ap(void);
118
 
119
/*
120
 * These two functions prevent stack from underflowing during the
121
 * kernel boot phase when SP is set to the very top of the reserved
122
 * space. The stack could get corrupted by a fooled compiler-generated
123
 * pop sequence otherwise.
124
 */
125
static void main_bsp_separated_stack(void);
625 palkovsky 126
#ifdef CONFIG_SMP
1 jermar 127
static void main_ap_separated_stack(void);
625 palkovsky 128
#endif
1 jermar 129
 
2048 jermar 130
#define CONFIG_STACK_SIZE   ((1 << STACK_FRAMES) * STACK_SIZE)
1138 jermar 131
 
1229 jermar 132
/** Main kernel routine for bootstrap CPU.
108 decky 133
 *
134
 * Initializes the kernel by bootstrap CPU.
675 jermar 135
 * This function passes control directly to
136
 * main_bsp_separated_stack().
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;
147
    config.memory_size = get_memory_size();
210 decky 148
 
2015 jermar 149
    config.kernel_size = ALIGN_UP(hardcoded_ktext_size +
2087 jermar 150
        hardcoded_kdata_size, PAGE_SIZE);
1833 decky 151
    config.stack_size = CONFIG_STACK_SIZE;
1037 decky 152
 
1833 decky 153
    /* Initialy the stack is placed just after the kernel */
154
    config.stack_base = config.base + config.kernel_size;
155
 
156
    /* Avoid placing stack on top of init */
1037 decky 157
    count_t i;
1833 decky 158
    for (i = 0; i < init.cnt; i++) {
2015 jermar 159
        if (PA_overlaps(config.stack_base, config.stack_size,
2087 jermar 160
            init.tasks[i].addr, init.tasks[i].size))
2015 jermar 161
            config.stack_base = ALIGN_UP(init.tasks[i].addr +
2087 jermar 162
                init.tasks[i].size, config.stack_size);
1833 decky 163
    }
1894 jermar 164
 
165
    /* Avoid placing stack on top of boot allocations. */
166
    if (ballocs.size) {
2015 jermar 167
        if (PA_overlaps(config.stack_base, config.stack_size,
2087 jermar 168
            ballocs.base, ballocs.size))
2015 jermar 169
            config.stack_base = ALIGN_UP(ballocs.base +
2087 jermar 170
                ballocs.size, PAGE_SIZE);
1894 jermar 171
    }
1037 decky 172
 
1833 decky 173
    if (config.stack_base < stack_safe)
174
        config.stack_base = ALIGN_UP(stack_safe, PAGE_SIZE);
210 decky 175
 
47 jermar 176
    context_save(&ctx);
2015 jermar 177
    context_set(&ctx, FADDR(main_bsp_separated_stack), config.stack_base,
2087 jermar 178
        THREAD_STACK_SIZE);
47 jermar 179
    context_restore(&ctx);
1 jermar 180
    /* not reached */
181
}
182
 
108 decky 183
 
1229 jermar 184
/** Main kernel routine for bootstrap CPU using new stack.
108 decky 185
 *
186
 * Second part of main_bsp().
187
 *
188
 */
174 jermar 189
void main_bsp_separated_stack(void)
190
{
1 jermar 191
    task_t *k;
192
    thread_t *t;
1109 jermar 193
    count_t i;
207 decky 194
 
184 jermar 195
    the_initialize(THE);
1109 jermar 196
 
517 jermar 197
    /*
198
     * kconsole data structures must be initialized very early
199
     * because other subsystems will register their respective
200
     * commands.
201
     */
202
    kconsole_init();
1037 decky 203
 
756 jermar 204
    /*
205
     * Exception handler initialization, before architecture
673 jermar 206
     * starts adding its own handlers
578 palkovsky 207
     */
208
    exc_init();
755 jermar 209
 
210
    /*
211
     * Memory management subsystems initialization.
212
     */
26 jermar 213
    arch_pre_mm_init();
2015 jermar 214
    frame_init();      
215
    /* Initialize at least 1 memory segment big enough for slab to work. */
789 palkovsky 216
    slab_cache_init();
1164 jermar 217
    btree_init();
756 jermar 218
    as_init();
23 jermar 219
    page_init();
220
    tlb_init();
2015 jermar 221
    ddi_init();
2260 hudecek 222
    tasklet_init();
1434 palkovsky 223
    arch_post_mm_init();
1101 jermar 224
 
673 jermar 225
    version_print();
2015 jermar 226
    printf("kernel: %.*p hardcoded_ktext_size=%zdK, "
2087 jermar 227
        "hardcoded_kdata_size=%zdK\n", sizeof(uintptr_t) * 2,
228
        config.base, hardcoded_ktext_size >> 10,
229
        hardcoded_kdata_size >> 10);
2015 jermar 230
    printf("stack:  %.*p size=%zdK\n", sizeof(uintptr_t) * 2,
2087 jermar 231
        config.stack_base, config.stack_size >> 10);
1 jermar 232
 
503 jermar 233
    arch_pre_smp_init();
34 jermar 234
    smp_init();
2015 jermar 235
    /* Slab must be initialized after we know the number of processors. */
236
    slab_enable_cpucache();
773 palkovsky 237
 
1389 decky 238
    printf("config.memory_size=%zdM\n", config.memory_size >> 20);
1196 cejka 239
    printf("config.cpu_count=%zd\n", config.cpu_count);
1 jermar 240
    cpu_init();
2292 hudecek 241
 
1 jermar 242
    calibrate_delay_loop();
1434 palkovsky 243
    clock_counter_init();
1 jermar 244
    timeout_init();
245
    scheduler_init();
246
    task_init();
247
    thread_init();
1109 jermar 248
    futex_init();
1595 palkovsky 249
    klog_init();
628 decky 250
 
1826 decky 251
    if (init.cnt > 0) {
252
        for (i = 0; i < init.cnt; i++)
2015 jermar 253
            printf("init[%zd].addr=%.*p, init[%zd].size=%zd\n", i,
2087 jermar 254
                sizeof(uintptr_t) * 2, init.tasks[i].addr, i,
255
                init.tasks[i].size);
1826 decky 256
    } else
1999 decky 257
        printf("No init binaries found\n");
2292 hudecek 258
 
955 palkovsky 259
    ipc_init();
1109 jermar 260
 
1 jermar 261
    /*
262
     * Create kernel task.
263
     */
2039 decky 264
    k = task_create(AS_KERNEL, "kernel");
210 decky 265
    if (!k)
266
        panic("can't create kernel task\n");
860 decky 267
 
1 jermar 268
    /*
269
     * Create the first thread.
270
     */
2042 decky 271
    t = thread_create(kinit, NULL, k, 0, "kinit", true);
210 decky 272
    if (!t)
273
        panic("can't create kinit thread\n");
1 jermar 274
    thread_ready(t);
2292 hudecek 275
 
276
    tasklet_run_tasklet_thread(k);
2260 hudecek 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
     */
2015 jermar 329
    context_set(&CPU->saved_context, FADDR(main_ap_separated_stack),
2087 jermar 330
        (uintptr_t) CPU->stack, CPU_STACK_SIZE);
47 jermar 331
    context_restore(&CPU->saved_context);
1 jermar 332
    /* not reached */
333
}
334
 
108 decky 335
 
1229 jermar 336
/** Main kernel routine for application CPUs using new stack.
108 decky 337
 *
338
 * Second part of main_ap().
339
 *
340
 */
1 jermar 341
void main_ap_separated_stack(void)
342
{
343
    /*
344
     * Configure timeouts for this cpu.
345
     */
346
    timeout_init();
347
 
348
    waitq_wakeup(&ap_completion_wq, WAKEUP_FIRST);
349
    scheduler();
350
    /* not reached */
351
}
458 decky 352
#endif /* CONFIG_SMP */
1702 cejka 353
 
1729 decky 354
/** @}
1702 cejka 355
 */