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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>

#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);

        strncpy(namebuf, INIT_PREFIX, TASK_NAME_BUFLEN);

        strncpy(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 */

}

/** @}

 */