/*
 * 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 (KA2PA(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 = KA2PA(config.init_addr);
		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... ");
		}
	}

}