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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.

 */

/** @addtogroup main

 * @{

 */

/**

 * @file

 * @brief	Kernel initialization thread.

 *

 * This file contains kinit kernel thread which carries out

 * high level system initialization.

 *

 * This file is responsible for finishing SMP configuration

 * and creation of userspace init tasks.

 */

#include <main/kinit.h>

#include <config.h>

#include <arch.h>

#include <proc/scheduler.h>

#include <proc/task.h>

#include <proc/thread.h>

#include <proc/program.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>

#include <security/cap.h>

#include <lib/rd.h>

#include <ipc/ipc.h>

#include <debug.h>

#include <string.h>

#ifdef CONFIG_SMP

#include <smp/smp.h>

#endif /* CONFIG_SMP */

#include <synch/waitq.h>

#include <synch/spinlock.h>

#define ALIVE_CHARS  4

#ifdef CONFIG_KCONSOLE

static char alive[ALIVE_CHARS] = "-\\|/";

#endif

#define BOOT_PREFIX		"boot:"

#define BOOT_PREFIX_LEN		5

/** 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)

{

#if defined(CONFIG_SMP) || defined(CONFIG_KCONSOLE)

	thread_t *thread;

#endif

	/*

	 * Detach kinit as nobody will call thread_join_timeout() on it.

	 */

	thread_detach(THREAD);

	interrupts_disable();

#ifdef CONFIG_SMP		 	

	if (config.cpu_count > 1) {

		waitq_initialize(&ap_completion_wq);

		/*

		 * 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.

		 */

		thread = thread_create(kmp, NULL, TASK, THREAD_FLAG_WIRED, "kmp", true);

		if (thread != NULL) {

			spinlock_lock(&thread->lock);

			thread->cpu = &cpus[0];

			spinlock_unlock(&thread->lock);

			thread_ready(thread);

		} else

			panic("Unable to create kmp thread.");

		thread_join(thread);

		thread_detach(thread);

	}

#endif /* CONFIG_SMP */

#ifdef CONFIG_SMP

	if (config.cpu_count > 1) {

		count_t i;

		/*

		 * For each CPU, create its load balancing thread.

		 */

		for (i = 0; i < config.cpu_count; i++) {

			thread = thread_create(kcpulb, NULL, TASK, THREAD_FLAG_WIRED, "kcpulb", true);

			if (thread != NULL) {

				spinlock_lock(&thread->lock);

				thread->cpu = &cpus[i];

				spinlock_unlock(&thread->lock);

				thread_ready(thread);

			} else

				printf("Unable to create kcpulb thread for cpu" PRIc "\n", i);

		}

	}

#endif /* CONFIG_SMP */

	/*

	 * At this point SMP, if present, is configured.

	 */

	arch_post_smp_init();

#ifdef CONFIG_KCONSOLE

	if (stdin) {

		/*

		 * Create kernel console.

		 */

		thread = thread_create(kconsole_thread, NULL, TASK, 0, "kconsole", false);

		if (thread != NULL)

			thread_ready(thread);

		else

			printf("Unable to create kconsole thread\n");

	}

#endif /* CONFIG_KCONSOLE */

	interrupts_enable();

	/*

	 * Create user tasks, load RAM disk images.

	 */

	count_t i;

	program_t programs[CONFIG_INIT_TASKS];

	for (i = 0; i < init.cnt; i++) {

		if (init.tasks[i].addr % FRAME_SIZE) {

			printf("init[%" PRIc "].addr is not frame aligned\n", i);

			continue;

		}

		/*

		 * Construct task name from the 'boot:' prefix and the

		 * name stored in the init structure (if any).

		 */

		char namebuf[TASK_NAME_BUFLEN], *name;

		name = init.tasks[i].name;

		if (name[0] == '\0') name = "<unknown>";

		ASSERT(TASK_NAME_BUFLEN >= BOOT_PREFIX_LEN);

		strncpy(namebuf, BOOT_PREFIX, TASK_NAME_BUFLEN);

		strncpy(namebuf + BOOT_PREFIX_LEN, name,

		    TASK_NAME_BUFLEN - BOOT_PREFIX_LEN);

		int rc = program_create_from_image((void *) init.tasks[i].addr,

		    namebuf, &programs[i]);

		if ((rc == 0) && (programs[i].task != NULL)) {

			/*

			 * Set capabilities to init userspace tasks.

			 */

			cap_set(programs[i].task, CAP_CAP | CAP_MEM_MANAGER |

			    CAP_IO_MANAGER | CAP_PREEMPT_CONTROL | CAP_IRQ_REG);

			if (!ipc_phone_0)

				ipc_phone_0 = &programs[i].task->answerbox;

		} else if (rc == 0) {

			/* It was the program loader and was registered */

		} else {

			/* RAM disk image */

			int rd = init_rd((rd_header_t *) init.tasks[i].addr, init.tasks[i].size);

			if (rd != RE_OK)

				printf("Init binary %" PRIc " not used (error %d)\n", i, rd);

		}

	}

	/*

	 * Run user tasks with small delays

	 * to avoid intermixed klog output.

	 *

	 * TODO: This certainly does not guarantee

	 *       anything, it just works in most of the

	 *       cases. Some better way how to achieve

	 *       nice klog output should be found.

	 */

	for (i = 0; i < init.cnt; i++) {

		if (programs[i].task != NULL) {

			program_ready(&programs[i]);

			thread_usleep(10000);

		}

	}

#ifdef CONFIG_KCONSOLE

	if (!stdin) {

		thread_sleep(10);

		printf("kinit: No stdin\nKernel alive: .");

		unsigned int i = 0;

		while (true) {

			printf("\b%c", alive[i % ALIVE_CHARS]);

			thread_sleep(1);

			i++;

		}

	}

#endif /* CONFIG_KCONSOLE */

}

/** @}

 */