source: mainline/generic/src/main/kinit.c@ 49a39c2

/*
 * 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;
        count_t frames;
        int i;
        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 (config.init_addr % FRAME_SIZE)
                        panic("config.init_addr is not frame aligned");
                
                as = as_create(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 initialize its mapping.
                 */
                
                frame = config.init_addr;
                if (IS_KA(frame))
                        frame = KA2PA(frame);

                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 (i = 0; i < frames; i++)
                        as_set_mapping(as, UTEXT_ADDRESS + i * PAGE_SIZE, frame + i * FRAME_SIZE);

                /*
                 * 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... ");
                }
        }

}