source: mainline/kernel/generic/src/main/kinit.c@ b60c582

/*
 * Copyright (c) 2001-2004 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup main
 * @{
 */

/**
 * @file
 * @brief Kernel initialization thread.
 *
 * This file contains kinit kernel thread which carries out
 * high level system initialization.
 *
 * This file is responsible for finishing SMP configuration
 * and creation of userspace init tasks.
 */

#include <main/kinit.h>
#include <config.h>
#include <arch.h>
#include <proc/scheduler.h>
#include <proc/task.h>
#include <proc/thread.h>
#include <proc/program.h>
#include <panic.h>
#include <func.h>
#include <cpu.h>
#include <arch/asm.h>
#include <mm/page.h>
#include <arch/mm/page.h>
#include <mm/as.h>
#include <mm/frame.h>
#include <print.h>
#include <memstr.h>
#include <console/console.h>
#include <interrupt.h>
#include <console/kconsole.h>
#include <security/cap.h>
#include <lib/rd.h>
#include <ipc/ipc.h>
#include <debug.h>
#include <string.h>

#ifdef CONFIG_SMP
#include <smp/smp.h>
#endif /* CONFIG_SMP */

#include <synch/waitq.h>
#include <synch/spinlock.h>

#define ALIVE_CHARS  4

#ifdef CONFIG_KCONSOLE
static char alive[ALIVE_CHARS] = "-\\|/";
#endif

#define INIT_PREFIX      "init:"
#define INIT_PREFIX_LEN  5

/** Kernel initialization thread.
 *
 * kinit takes care of higher level kernel
 * initialization (i.e. thread creation,
 * userspace initialization etc.).
 *
 * @param arg Not used.
 */
void kinit(void *arg)
{

#if defined(CONFIG_SMP) || defined(CONFIG_KCONSOLE)
        thread_t *thread;
#endif
        
        /*
         * Detach kinit as nobody will call thread_join_timeout() on it.
         */
        thread_detach(THREAD);
        
        interrupts_disable();
        
#ifdef CONFIG_SMP
        if (config.cpu_count > 1) {
                waitq_initialize(&ap_completion_wq);
                /*
                 * Create the kmp thread and wait for its completion.
                 * cpu1 through cpuN-1 will come up consecutively and
                 * not mess together with kcpulb threads.
                 * Just a beautification.
                 */
                thread = thread_create(kmp, NULL, TASK, THREAD_FLAG_WIRED, "kmp", true);
                if (thread != NULL) {
                        spinlock_lock(&thread->lock);
                        thread->cpu = &cpus[0];
                        spinlock_unlock(&thread->lock);
                        thread_ready(thread);
                } else
                        panic("Unable to create kmp thread.");
                thread_join(thread);
                thread_detach(thread);
        }
        
        if (config.cpu_count > 1) {
                count_t i;
                
                /*
                 * For each CPU, create its load balancing thread.
                 */
                for (i = 0; i < config.cpu_count; i++) {
                        thread = thread_create(kcpulb, NULL, TASK, THREAD_FLAG_WIRED, "kcpulb", true);
                        if (thread != NULL) {
                                spinlock_lock(&thread->lock);
                                thread->cpu = &cpus[i];
                                spinlock_unlock(&thread->lock);
                                thread_ready(thread);
                        } else
                                printf("Unable to create kcpulb thread for cpu" PRIc "\n", i);
                }
        }
#endif /* CONFIG_SMP */
        
        /*
         * At this point SMP, if present, is configured.
         */
        arch_post_smp_init();
        
#ifdef CONFIG_KCONSOLE
        if (stdin) {
                /*
                 * Create kernel console.
                 */
                thread = thread_create(kconsole_thread, NULL, TASK, 0, "kconsole", false);
                if (thread != NULL)
                        thread_ready(thread);
                else
                        printf("Unable to create kconsole thread\n");
        }
#endif /* CONFIG_KCONSOLE */
        
        interrupts_enable();
        
        /*
         * Create user tasks, load RAM disk images.
         */
        count_t i;
        program_t programs[CONFIG_INIT_TASKS];
        
        for (i = 0; i < init.cnt; i++) {
                if (init.tasks[i].addr % FRAME_SIZE) {
                        printf("init[%" PRIc "].addr is not frame aligned\n", i);
                        continue;
                }
                
                /*
                 * Construct task name from the 'init:' prefix and the
                 * name stored in the init structure (if any).
                 */
                
                char namebuf[TASK_NAME_BUFLEN];
                char *name;
                
                name = init.tasks[i].name;
                if (name[0] == 0)
                        name = "<unknown>";
                
                ASSERT(TASK_NAME_BUFLEN >= INIT_PREFIX_LEN);
                str_ncpy(namebuf, INIT_PREFIX, TASK_NAME_BUFLEN);
                str_ncpy(namebuf + INIT_PREFIX_LEN, name,
                    TASK_NAME_BUFLEN - INIT_PREFIX_LEN);
                
                int rc = program_create_from_image((void *) init.tasks[i].addr,
                    namebuf, &programs[i]);
                
                if ((rc == 0) && (programs[i].task != NULL)) {
                        /*
                         * Set capabilities to init userspace tasks.
                         */
                        cap_set(programs[i].task, CAP_CAP | CAP_MEM_MANAGER |
                            CAP_IO_MANAGER | CAP_PREEMPT_CONTROL | CAP_IRQ_REG);
                        
                        if (!ipc_phone_0)
                                ipc_phone_0 = &programs[i].task->answerbox;
                } else if (rc == 0) {
                        /* It was the program loader and was registered */
                } else {
                        /* RAM disk image */
                        int rd = init_rd((rd_header_t *) init.tasks[i].addr, init.tasks[i].size);
                        
                        if (rd != RE_OK)
                                printf("Init binary %" PRIc " not used (error %d)\n", i, rd);
                }
        }
        
        /*
         * Run user tasks with small delays
         * to avoid intermixed klog output.
         *
         * TODO: This certainly does not guarantee
         *       anything, it just works in most of the
         *       cases. Some better way how to achieve
         *       nice klog output should be found.
         */
        for (i = 0; i < init.cnt; i++) {
                if (programs[i].task != NULL) {
                        program_ready(&programs[i]);
                        thread_usleep(10000);
                }
        }
        
#ifdef CONFIG_KCONSOLE
        if (!stdin) {
                thread_sleep(10);
                printf("kinit: No stdin\nKernel alive: .");
                
                unsigned int i = 0;
                while (true) {
                        printf("\b%c", alive[i % ALIVE_CHARS]);
                        thread_sleep(1);
                        i++;
                }
        }
#endif /* CONFIG_KCONSOLE */
}

/** @}
 */