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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;

	__address frame;

	index_t pfn[1];

	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.

		 */

		as = as_create(NULL);

		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.

		 */	

		a = as_area_create(as, AS_AREA_TEXT, 1, UTEXT_ADDRESS);

		if (!a)

			panic("as_area_create: text\n");

		// FIXME: Better way to initialize static code/data

		frame = frame_alloc(0, ONE_FRAME, NULL);

		memcpy((void *) PA2KA(frame), (void *) config.init_addr, config.init_size < PAGE_SIZE ? config.init_size : PAGE_SIZE);

		pfn[0] = frame / FRAME_SIZE;

		as_area_load_mapping(a, 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... ");

		}

	}

}