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/*
 * 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>

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

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

/** 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\n");
        thread_join(thread);
        thread_detach(thread);
    }
#endif /* CONFIG_SMP */
    
#ifdef CONFIG_SMP
    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;
        }
        
        int rc = program_create_from_image((void *) init.tasks[i].addr,
            "init-bin", &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 reasonable delays
     */
    for (i = 0; i < init.cnt; i++) {
        if (programs[i].task != NULL) {
            thread_usleep(50000);
            program_ready(&programs[i]);
        }
    }

#ifdef CONFIG_KCONSOLE
    if (!stdin) {
        printf("kinit: No stdin\nKernel alive: ");
        
        uint64_t i = 0;
        while (1) {
            printf(PRIu64 " ", i);
            thread_sleep(1);
            i++;
        }
    }
#endif /* CONFIG_KCONSOLE */
}

/** @}
 */