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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;
    index_t frame, frames;
    index_t pfn;
    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.
         */
        
        if (KA2PA(config.init_addr) % FRAME_SIZE)
            panic("config.init_addr is not frame aligned");
        
        as = as_create(NULL, 0);
        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.
         */
        
        frame = KA2PA(config.init_addr) / FRAME_SIZE;
        frames = config.init_size / FRAME_SIZE;
        if (config.init_size % FRAME_SIZE > 0)
            frames++;
        
        a = as_area_create(as, AS_AREA_TEXT, frames, UTEXT_ADDRESS);
        if (!a)
            panic("as_area_create: text\n");
        
        for (pfn = 0; pfn < frames; pfn++)
            as_area_set_mapping(a, pfn, frame + 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... ");
        }
    }

}