source: mainline/generic/src/main/kinit.c@ 6c68b97

/*
 * 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/vm.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;
        int i;
#ifdef CONFIG_USERSPACE
        vm_t *m;
        vm_area_t *a;
        task_t *u;
#endif

        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.
         */
        for (i = 0; i < config.cpu_count; i++) {
                if (cpus[i].active)
                        cpu_print_report(&cpus[i]);
                else
                        printf("cpu%d: not active\n", i);
        }

#ifdef CONFIG_SMP
        if (config.cpu_count > 1) {
                /*
                 * 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();

#ifdef CONFIG_USERSPACE
        /*
         * Create the first user task.
         */
        m = vm_create(NULL);
        if (!m)
                panic("vm_create\n");
        u = task_create(m);
        if (!u)
                panic("task_create\n");
        t = thread_create(uinit, NULL, u, THREAD_USER_STACK);
        if (!t)
                panic("thread_create\n");

        /*
         * Create the text vm_area and copy the userspace code there.
         */     
        a = vm_area_create(m, VMA_TEXT, 1, UTEXT_ADDRESS);
        if (!a)
                panic("vm_area_create: vm_text\n");
        vm_area_map(a, m);
        memcpy((void *) PA2KA(a->mapping[0]), (void *) utext, utext_size < PAGE_SIZE ? utext_size : PAGE_SIZE);

        /*
         * Create the data vm_area.
         */
        a = vm_area_create(m, VMA_STACK, 1, USTACK_ADDRESS);
        if (!a)
                panic("vm_area_create: vm_stack\n");
        vm_area_map(a, m);      
        
        thread_ready(t);
#endif /* CONFIG_USERSPACE */

#ifdef CONFIG_TEST
        test();
#endif /* CONFIG_TEST */

        if (!stdin) {
                while (1) {
                        thread_sleep(1);
                        printf("kinit... ");
                }
        }

}