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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.

 */

#include <main/kinit.h>

#include <main/uinit.h>

#include <config.h>

#include <arch.h>

#include <proc/scheduler.h>

#include <proc/task.h>

#include <proc/thread.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>

#ifdef CONFIG_SMP

#include <arch/smp/mps.h>

#endif /* CONFIG_SMP */

#include <synch/waitq.h>

#include <synch/spinlock.h>

#ifdef CONFIG_TEST

#include <test.h>

#endif /* CONFIG_TEST */

/** 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)

{

    thread_t *t;

    as_t *as;

    as_area_t *a;

    __address frame;

    index_t pfn[1];

    task_t *u;

    interrupts_disable();

#ifdef CONFIG_SMP           

    if (config.cpu_count > 1) {

        /*

         * 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.

         */

        if ((t = thread_create(kmp, NULL, TASK, 0))) {

            spinlock_lock(&t->lock);

            t->flags |= X_WIRED;

            t->cpu = &cpus[0];

            spinlock_unlock(&t->lock);

            thread_ready(t);

            waitq_sleep(&kmp_completion_wq);

        }

        else panic("thread_create/kmp\n");

    }

#endif /* CONFIG_SMP */

    /*

     * Now that all CPUs are up, we can report what we've found.

     */

    cpu_list();

#ifdef CONFIG_SMP

    if (config.cpu_count > 1) {

        int i;

        /*

         * For each CPU, create its load balancing thread.

         */

        for (i = 0; i < config.cpu_count; i++) {

            if ((t = thread_create(kcpulb, NULL, TASK, 0))) {

                spinlock_lock(&t->lock);           

                t->flags |= X_WIRED;

                t->cpu = &cpus[i];

                spinlock_unlock(&t->lock);

                thread_ready(t);

            }

            else panic("thread_create/kcpulb\n");

        }

    }

#endif /* CONFIG_SMP */

    /*

     * At this point SMP, if present, is configured.

     */

    arch_post_smp_init();

    /*

     * Create kernel console.

     */

    if ((t = thread_create(kconsole, "kconsole", TASK, 0)))

        thread_ready(t);

    else panic("thread_create/kconsole\n");

    interrupts_enable();

    if (config.init_size > 0) {

        /*

         * Create the first user task.

         */

        as = as_create(NULL);

        if (!as)

            panic("as_create\n");

        u = task_create(as);

        if (!u)

            panic("task_create\n");

        t = thread_create(uinit, NULL, u, THREAD_USER_STACK);

        if (!t)

            panic("thread_create\n");

        /*

         * Create the text as_area and copy the userspace code there.

         */

        a = as_area_create(as, AS_AREA_TEXT, 1, UTEXT_ADDRESS);

        if (!a)

            panic("as_area_create: text\n");

        // FIXME: Better way to initialize static code/data

        frame = frame_alloc(0, ONE_FRAME, NULL);

        memcpy((void *) PA2KA(frame), (void *) config.init_addr, config.init_size < PAGE_SIZE ? config.init_size : PAGE_SIZE);

        pfn[0] = frame / FRAME_SIZE;

        as_area_load_mapping(a, pfn);

        /*

         * Create the data as_area.

         */

        a = as_area_create(as, AS_AREA_STACK, 1, USTACK_ADDRESS);

        if (!a)

            panic("as_area_create: stack\n");

        thread_ready(t);

    }

#ifdef CONFIG_TEST

    test();

#endif /* CONFIG_TEST */

    if (!stdin) {

        while (1) {

            thread_sleep(1);

            printf("kinit... ");

        }

    }

}