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1 jermar 1
/*
2071 jermar 2
 * Copyright (c) 2001-2004 Jakub Jermar
1 jermar 3
 * All rights reserved.
4
 *
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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:
8
 *
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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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 *
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
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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.
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 */
28
 
1729 decky 29
/** @addtogroup main
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 * @{
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 */
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>
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#include <main/kinit.h>
675 jermar 62
#include <main/version.h>
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#include <console/kconsole.h>
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#include <console/console.h>
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#include <cpu.h>
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#include <align.h>
578 palkovsky 67
#include <interrupt.h>
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#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>
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#include <arch/arch.h>
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#include <arch.h>
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#include <arch/faddr.h>
955 palkovsky 79
#include <ipc/ipc.h>
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#include <macros.h>
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#include <adt/btree.h>
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#include <smp/smp.h>
2015 jermar 83
#include <ddi/ddi.h>
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3197 svoboda 85
 
1315 jermar 86
/** Global configuration structure. */
1757 jermar 87
config_t config;
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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 = {
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    .base = NULL,
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    .size = 0
98
};
99
 
1 jermar 100
context_t ctx;
101
 
1757 jermar 102
/*
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 * These 'hardcoded' variables will be intialized by
105 jermar 104
 * the linker or the low level assembler code with
105
 * appropriate sizes and addresses.
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 */
107
 
2746 decky 108
/**< Virtual address of where the kernel is loaded. */
109
uintptr_t hardcoded_load_address = 0;
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/**< Size of the kernel code in bytes. */
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size_t hardcoded_ktext_size = 0;
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/**< Size of the kernel data in bytes. */
113
size_t hardcoded_kdata_size = 0;
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/**< Lowest safe stack virtual address. */
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uintptr_t stack_safe = 0;      
116
 
1 jermar 117
void main_bsp(void);
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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
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 * pop sequence otherwise.
125
 */
126
static void main_bsp_separated_stack(void);
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#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.
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 *
3191 svoboda 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.
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 *
413 jermar 141
 * Assuming interrupts_disable().
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 *
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);
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    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,
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            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);
210 decky 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
{
3191 svoboda 192
    /* Keep this the first thing. */
193
    the_initialize(THE);
194
 
3149 svoboda 195
    LOG();
207 decky 196
 
3191 svoboda 197
    version_print();
198
 
199
    LOG("\nconfig.base=%#" PRIp " config.kernel_size=%" PRIs
200
        "\nconfig.stack_base=%#" PRIp " config.stack_size=%" PRIs,
201
        config.base, config.kernel_size, config.stack_base,
202
        config.stack_size);
203
 
1109 jermar 204
 
517 jermar 205
    /*
206
     * kconsole data structures must be initialized very early
207
     * because other subsystems will register their respective
208
     * commands.
209
     */
3149 svoboda 210
    LOG_EXEC(kconsole_init());
1037 decky 211
 
756 jermar 212
    /*
213
     * Exception handler initialization, before architecture
673 jermar 214
     * starts adding its own handlers
578 palkovsky 215
     */
3149 svoboda 216
    LOG_EXEC(exc_init());
755 jermar 217
 
218
    /*
219
     * Memory management subsystems initialization.
3149 svoboda 220
     */
221
    LOG_EXEC(arch_pre_mm_init());
222
    LOG_EXEC(frame_init());
223
 
2015 jermar 224
    /* Initialize at least 1 memory segment big enough for slab to work. */
3149 svoboda 225
    LOG_EXEC(slab_cache_init());
226
    LOG_EXEC(btree_init());
227
    LOG_EXEC(as_init());
228
    LOG_EXEC(page_init());
229
    LOG_EXEC(tlb_init());
230
    LOG_EXEC(ddi_init());
231
    LOG_EXEC(tasklet_init());
232
    LOG_EXEC(arch_post_mm_init());
233
    LOG_EXEC(arch_pre_smp_init());
234
    LOG_EXEC(smp_init());
2725 decky 235
 
2015 jermar 236
    /* Slab must be initialized after we know the number of processors. */
3149 svoboda 237
    LOG_EXEC(slab_enable_cpucache());
2725 decky 238
 
3197 svoboda 239
    printf("Detected %" PRIc " CPU(s), %" PRIu64" MiB free memory\n",
240
        config.cpu_count, SIZE2MB(zone_total_size()));
860 decky 241
 
3149 svoboda 242
    LOG_EXEC(cpu_init());
628 decky 243
 
3149 svoboda 244
    LOG_EXEC(calibrate_delay_loop());
245
    LOG_EXEC(clock_counter_init());
246
    LOG_EXEC(timeout_init());
247
    LOG_EXEC(scheduler_init());
248
    LOG_EXEC(task_init());
249
    LOG_EXEC(thread_init());
250
    LOG_EXEC(futex_init());
251
 
1826 decky 252
    if (init.cnt > 0) {
3149 svoboda 253
        count_t i;
1826 decky 254
        for (i = 0; i < init.cnt; i++)
3191 svoboda 255
            printf("init[%" PRIc "].addr=%#" PRIp ", init[%" PRIc
3197 svoboda 256
                "].size=%#" PRIs "\n", i, init.tasks[i].addr, i,
257
                init.tasks[i].size);
1826 decky 258
    } else
1999 decky 259
        printf("No init binaries found\n");
955 palkovsky 260
 
3149 svoboda 261
    LOG_EXEC(ipc_init());
3153 svoboda 262
    LOG_EXEC(klog_init());
1109 jermar 263
 
1 jermar 264
    /*
265
     * Create kernel task.
266
     */
3149 svoboda 267
    task_t *kernel = task_create(AS_KERNEL, "kernel");
268
    if (!kernel)
269
        panic("Can't create kernel task\n");
860 decky 270
 
1 jermar 271
    /*
272
     * Create the first thread.
273
     */
3191 svoboda 274
    thread_t *kinit_thread = thread_create(kinit, NULL, kernel, 0, "kinit",
275
        true);
3149 svoboda 276
    if (!kinit_thread)
277
        panic("Can't create kinit thread\n");
278
    LOG_EXEC(thread_ready(kinit_thread));
860 decky 279
 
1 jermar 280
    /*
281
     * This call to scheduler() will return to kinit,
282
     * starting the thread of kernel threads.
283
     */
284
    scheduler();
285
    /* not reached */
286
}
287
 
108 decky 288
 
458 decky 289
#ifdef CONFIG_SMP
1229 jermar 290
/** Main kernel routine for application CPUs.
108 decky 291
 *
292
 * Executed by application processors, temporary stack
1901 jermar 293
 * is at ctx.sp which was set during BSP boot.
675 jermar 294
 * This function passes control directly to
295
 * main_ap_separated_stack().
108 decky 296
 *
413 jermar 297
 * Assuming interrupts_disable()'d.
108 decky 298
 *
1 jermar 299
 */
300
void main_ap(void)
301
{
302
    /*
303
     * Incrementing the active CPU counter will guarantee that the
1901 jermar 304
     * *_init() functions can find out that they need to
305
     * do initialization for AP only.
1 jermar 306
     */
307
    config.cpu_active++;
308
 
192 jermar 309
    /*
310
     * The THE structure is well defined because ctx.sp is used as stack.
311
     */
312
    the_initialize(THE);
298 decky 313
 
26 jermar 314
    arch_pre_mm_init();
1 jermar 315
    frame_init();
316
    page_init();
389 jermar 317
    tlb_init();
26 jermar 318
    arch_post_mm_init();
298 decky 319
 
1 jermar 320
    cpu_init();
321
    calibrate_delay_loop();
1901 jermar 322
    arch_post_cpu_init();
1 jermar 323
 
192 jermar 324
    the_copy(THE, (the_t *) CPU->stack);
1 jermar 325
 
326
    /*
327
     * If we woke kmp up before we left the kernel stack, we could
328
     * collide with another CPU coming up. To prevent this, we
329
     * switch to this cpu's private stack prior to waking kmp up.
330
     */
3588 svoboda 331
    context_save(&CPU->saved_context);
2015 jermar 332
    context_set(&CPU->saved_context, FADDR(main_ap_separated_stack),
2087 jermar 333
        (uintptr_t) CPU->stack, CPU_STACK_SIZE);
47 jermar 334
    context_restore(&CPU->saved_context);
1 jermar 335
    /* not reached */
336
}
337
 
108 decky 338
 
1229 jermar 339
/** Main kernel routine for application CPUs using new stack.
108 decky 340
 *
341
 * Second part of main_ap().
342
 *
343
 */
1 jermar 344
void main_ap_separated_stack(void)
345
{
346
    /*
347
     * Configure timeouts for this cpu.
348
     */
349
    timeout_init();
350
 
351
    waitq_wakeup(&ap_completion_wq, WAKEUP_FIRST);
352
    scheduler();
353
    /* not reached */
354
}
458 decky 355
#endif /* CONFIG_SMP */
1702 cejka 356
 
1729 decky 357
/** @}
1702 cejka 358
 */