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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/vm.h>

#include <mm/frame.h>

#include <print.h>

#include <memstr.h>

#include <console/console.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)

{

	vm_t *m;

	vm_area_t *a;

	task_t *u;

	thread_t *t;

	int i;

	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, NULL, 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... ");

		}

	}

}