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1 jermar 1
/*
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 * 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.
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 */
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1248 jermar 29
/**
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 * @file    main.c
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 * @brief   Main initialization kernel function for all processors.
32
 *
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 * During kernel boot, all processors, after architecture dependent
34
 * initialization, start executing code found in this file. After
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 * bringing up all subsystems, control is passed to scheduler().
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 *
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 * The bootstrap processor starts executing main_bsp() while
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 * the application processors start executing main_ap().
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 *
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 * @see scheduler()
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 * @see main_bsp()
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 * @see main_ap()
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 */
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1 jermar 45
#include <arch/asm.h>
97 jermar 46
#include <context.h>
1 jermar 47
#include <print.h>
68 decky 48
#include <panic.h>
561 decky 49
#include <debug.h>
1 jermar 50
#include <config.h>
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#include <time/clock.h>
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#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 56
#include <main/version.h>
518 jermar 57
#include <console/kconsole.h>
1 jermar 58
#include <cpu.h>
402 jermar 59
#include <align.h>
578 palkovsky 60
#include <interrupt.h>
146 cejka 61
#include <arch/mm/memory_init.h>
1 jermar 62
#include <mm/frame.h>
63
#include <mm/page.h>
684 jermar 64
#include <genarch/mm/page_pt.h>
5 jermar 65
#include <mm/tlb.h>
703 jermar 66
#include <mm/as.h>
759 palkovsky 67
#include <mm/slab.h>
1 jermar 68
#include <synch/waitq.h>
1109 jermar 69
#include <synch/futex.h>
210 decky 70
#include <arch/arch.h>
1 jermar 71
#include <arch.h>
76 jermar 72
#include <arch/faddr.h>
106 jermar 73
#include <typedefs.h>
955 palkovsky 74
#include <ipc/ipc.h>
1063 palkovsky 75
#include <macros.h>
1164 jermar 76
#include <adt/btree.h>
106 jermar 77
 
675 jermar 78
#ifdef CONFIG_SMP
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#include <arch/smp/apic.h>
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#include <arch/smp/mps.h>
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#endif /* CONFIG_SMP */
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#include <smp/smp.h>
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1315 jermar 84
/** Global configuration structure. */
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config_t config = {
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    .mm_initialized = false
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};
675 jermar 88
 
1315 jermar 89
/** Initial user-space tasks */
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init_t init = {
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92
};
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1 jermar 94
context_t ctx;
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523 jermar 96
/**
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 * These 'hardcoded' variables will be intialized by
105 jermar 98
 * the linker or the low level assembler code with
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 * appropriate sizes and addresses.
1 jermar 100
 */
37 jermar 101
__address hardcoded_load_address = 0;
106 jermar 102
size_t hardcoded_ktext_size = 0;
103
size_t hardcoded_kdata_size = 0;
1 jermar 104
 
105
void main_bsp(void);
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void main_ap(void);
107
 
108
/*
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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.
113
 */
114
static void main_bsp_separated_stack(void);
625 palkovsky 115
#ifdef CONFIG_SMP
1 jermar 116
static void main_ap_separated_stack(void);
625 palkovsky 117
#endif
1 jermar 118
 
1138 jermar 119
#define CONFIG_STACK_SIZE   ((1<<STACK_FRAMES)*STACK_SIZE)
120
 
1229 jermar 121
/** Main kernel routine for bootstrap CPU.
108 decky 122
 *
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 * Initializes the kernel by bootstrap CPU.
675 jermar 124
 * This function passes control directly to
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 * main_bsp_separated_stack().
108 decky 126
 *
413 jermar 127
 * Assuming interrupts_disable().
108 decky 128
 *
1 jermar 129
 */
130
void main_bsp(void)
131
{
814 palkovsky 132
    __address stackaddr;
133
 
1 jermar 134
    config.cpu_count = 1;
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    config.cpu_active = 1;
651 decky 136
 
369 jermar 137
    config.base = hardcoded_load_address;
138
    config.memory_size = get_memory_size();
210 decky 139
 
814 palkovsky 140
    config.kernel_size = ALIGN_UP(hardcoded_ktext_size + hardcoded_kdata_size, PAGE_SIZE);
141
    stackaddr = config.base + config.kernel_size;
1037 decky 142
 
814 palkovsky 143
    /* Avoid placing kernel on top of init */
1037 decky 144
    count_t i;
145
    bool overlap = false;
146
    for (i = 0; i < init.cnt; i++)
1063 palkovsky 147
        if (PA_overlaps(stackaddr, CONFIG_STACK_SIZE, init.tasks[i].addr, init.tasks[i].size)) {
1037 decky 148
            stackaddr = ALIGN_UP(init.tasks[i].addr + init.tasks[i].size, CONFIG_STACK_SIZE);
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            init.tasks[i].size = ALIGN_UP(init.tasks[i].size, CONFIG_STACK_SIZE) + CONFIG_STACK_SIZE;
150
            overlap = true;
151
        }
152
 
153
    if (!overlap)
814 palkovsky 154
        config.kernel_size += CONFIG_STACK_SIZE;
210 decky 155
 
47 jermar 156
    context_save(&ctx);
1138 jermar 157
    context_set(&ctx, FADDR(main_bsp_separated_stack), stackaddr, THREAD_STACK_SIZE);
47 jermar 158
    context_restore(&ctx);
1 jermar 159
    /* not reached */
160
}
161
 
108 decky 162
 
1229 jermar 163
/** Main kernel routine for bootstrap CPU using new stack.
108 decky 164
 *
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 * Second part of main_bsp().
166
 *
167
 */
174 jermar 168
void main_bsp_separated_stack(void)
169
{
1 jermar 170
    task_t *k;
171
    thread_t *t;
1109 jermar 172
    count_t i;
207 decky 173
 
184 jermar 174
    the_initialize(THE);
1109 jermar 175
 
517 jermar 176
    /*
177
     * kconsole data structures must be initialized very early
178
     * because other subsystems will register their respective
179
     * commands.
180
     */
181
    kconsole_init();
1037 decky 182
 
756 jermar 183
    /*
184
     * Exception handler initialization, before architecture
673 jermar 185
     * starts adding its own handlers
578 palkovsky 186
     */
187
    exc_init();
755 jermar 188
 
189
    /*
190
     * Memory management subsystems initialization.
191
     */
26 jermar 192
    arch_pre_mm_init();
1101 jermar 193
    frame_init();       /* Initialize at least 1 memory segment big enough for slab to work */
789 palkovsky 194
    slab_cache_init();
1164 jermar 195
    btree_init();
756 jermar 196
    as_init();
23 jermar 197
    page_init();
198
    tlb_init();
1315 jermar 199
    config.mm_initialized = true;
1434 palkovsky 200
    arch_post_mm_init();
1101 jermar 201
 
673 jermar 202
    version_print();
1389 decky 203
    printf("%.*p: hardcoded_ktext_size=%zdK, hardcoded_kdata_size=%zdK\n", sizeof(__address) * 2, config.base, hardcoded_ktext_size >> 10, hardcoded_kdata_size >> 10);
1 jermar 204
 
503 jermar 205
    arch_pre_smp_init();
34 jermar 206
    smp_init();
1101 jermar 207
 
208
    slab_enable_cpucache(); /* Slab must be initialized AFTER we know the number of processors */
773 palkovsky 209
 
1389 decky 210
    printf("config.memory_size=%zdM\n", config.memory_size >> 20);
1196 cejka 211
    printf("config.cpu_count=%zd\n", config.cpu_count);
1 jermar 212
    cpu_init();
860 decky 213
 
1 jermar 214
    calibrate_delay_loop();
1434 palkovsky 215
    clock_counter_init();
1 jermar 216
    timeout_init();
217
    scheduler_init();
218
    task_init();
219
    thread_init();
1109 jermar 220
    futex_init();
628 decky 221
 
1037 decky 222
    for (i = 0; i < init.cnt; i++)
1389 decky 223
        printf("init[%zd].addr=%.*p, init[%zd].size=%zd\n", i, sizeof(__address) * 2, init.tasks[i].addr, i, init.tasks[i].size);
955 palkovsky 224
 
225
    ipc_init();
1109 jermar 226
 
1 jermar 227
    /*
228
     * Create kernel task.
229
     */
1062 jermar 230
    k = task_create(AS_KERNEL, "KERNEL");
210 decky 231
    if (!k)
232
        panic("can't create kernel task\n");
860 decky 233
 
1 jermar 234
    /*
235
     * Create the first thread.
236
     */
1062 jermar 237
    t = thread_create(kinit, NULL, k, 0, "kinit");
210 decky 238
    if (!t)
239
        panic("can't create kinit thread\n");
1 jermar 240
    thread_ready(t);
860 decky 241
 
1 jermar 242
    /*
243
     * This call to scheduler() will return to kinit,
244
     * starting the thread of kernel threads.
245
     */
246
    scheduler();
247
    /* not reached */
248
}
249
 
108 decky 250
 
458 decky 251
#ifdef CONFIG_SMP
1229 jermar 252
/** Main kernel routine for application CPUs.
108 decky 253
 *
254
 * Executed by application processors, temporary stack
255
 * is at ctx.sp which was set during BP boot.
675 jermar 256
 * This function passes control directly to
257
 * main_ap_separated_stack().
108 decky 258
 *
413 jermar 259
 * Assuming interrupts_disable()'d.
108 decky 260
 *
1 jermar 261
 */
262
void main_ap(void)
263
{
264
    /*
265
     * Incrementing the active CPU counter will guarantee that the
266
     * pm_init() will not attempt to build GDT and IDT tables again.
267
     * Neither frame_init() will do the complete thing. Neither cpu_init()
268
     * will do.
269
     */
270
    config.cpu_active++;
271
 
192 jermar 272
    /*
273
     * The THE structure is well defined because ctx.sp is used as stack.
274
     */
275
    the_initialize(THE);
298 decky 276
 
26 jermar 277
    arch_pre_mm_init();
1 jermar 278
    frame_init();
279
    page_init();
389 jermar 280
    tlb_init();
26 jermar 281
    arch_post_mm_init();
298 decky 282
 
1 jermar 283
    cpu_init();
298 decky 284
 
1 jermar 285
    calibrate_delay_loop();
286
 
287
    l_apic_init();
288
    l_apic_debug();
289
 
192 jermar 290
    the_copy(THE, (the_t *) CPU->stack);
1 jermar 291
 
292
    /*
293
     * If we woke kmp up before we left the kernel stack, we could
294
     * collide with another CPU coming up. To prevent this, we
295
     * switch to this cpu's private stack prior to waking kmp up.
296
     */
414 jermar 297
    context_set(&CPU->saved_context, FADDR(main_ap_separated_stack), (__address) CPU->stack, CPU_STACK_SIZE);
47 jermar 298
    context_restore(&CPU->saved_context);
1 jermar 299
    /* not reached */
300
}
301
 
108 decky 302
 
1229 jermar 303
/** Main kernel routine for application CPUs using new stack.
108 decky 304
 *
305
 * Second part of main_ap().
306
 *
307
 */
1 jermar 308
void main_ap_separated_stack(void)
309
{
310
    /*
311
     * Configure timeouts for this cpu.
312
     */
313
    timeout_init();
314
 
315
    waitq_wakeup(&ap_completion_wq, WAKEUP_FIRST);
316
    scheduler();
317
    /* not reached */
318
}
458 decky 319
#endif /* CONFIG_SMP */