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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/uinit.h>

#include <proc/thread.h>

#include <proc/task.h>

#include <proc/uarg.h>

#include <mm/as.h>

#include <mm/as_arg.h>

#include <mm/slab.h>

#include <synch/spinlock.h>

#include <arch.h>

#include <panic.h>

#include <adt/btree.h>

#include <adt/list.h>

#include <ipc/ipc.h>

#include <security/cap.h>

#include <memstr.h>

#include <print.h>

#include <elf.h>

#ifndef LOADED_PROG_STACK_PAGES_NO

#define LOADED_PROG_STACK_PAGES_NO 1

#endif

SPINLOCK_INITIALIZE(tasks_lock);

btree_t tasks_btree;

static task_id_t task_counter = 0;

/** Initialize tasks

 *

 * Initialize kernel tasks support.

 *

 */

void task_init(void)

{

	TASK = NULL;

	btree_create(&tasks_btree);

}

/** Create new task

 *

 * Create new task with no threads.

 *

 * @param as Task's address space.

 * @param name Symbolic name.

 *

 * @return New task's structure

 *

 */

task_t *task_create(as_t *as, char *name)

{

	ipl_t ipl;

	task_t *ta;

	int i;

	ta = (task_t *) malloc(sizeof(task_t), 0);

	task_create_arch(ta);

	spinlock_initialize(&ta->lock, "task_ta_lock");

	list_initialize(&ta->th_head);

	ta->as = as;

	ta->name = name;

	ta->capabilities = 0;

	ipc_answerbox_init(&ta->answerbox);

	for (i=0; i < IPC_MAX_PHONES;i++)

		ipc_phone_init(&ta->phones[i]);

	if (ipc_phone_0)

		ipc_phone_connect(&ta->phones[0], ipc_phone_0);

	atomic_set(&ta->active_calls, 0);

	memsetb((__address) &ta->accept_arg, sizeof(as_area_acptsnd_arg_t), 0);

	ipl = interrupts_disable();

	spinlock_lock(&tasks_lock);

	ta->taskid = ++task_counter;

	btree_insert(&tasks_btree, (btree_key_t) ta->taskid, (void *) ta, NULL);

	spinlock_unlock(&tasks_lock);

	interrupts_restore(ipl);

	return ta;

}

/** Create new task with 1 thread and run it

 *

 * @param programe_addr Address of program executable image.

 * @param name Program name. 

 *

 * @return Task of the running program or NULL on error.

 */

task_t * task_run_program(void *program_addr, char *name)

{

	as_t *as;

	as_area_t *a;

	int rc;

	thread_t *t;

	task_t *task;

	uspace_arg_t *kernel_uarg;

	as = as_create(0);

	ASSERT(as);

	rc = elf_load((elf_header_t *) program_addr, as);

	if (rc != EE_OK) {

		as_free(as);

		return NULL;

	} 

	kernel_uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t), 0);

	kernel_uarg->uspace_entry = (void *) ((elf_header_t *) program_addr)->e_entry;

	kernel_uarg->uspace_stack = (void *) USTACK_ADDRESS;

	kernel_uarg->uspace_thread_function = NULL;

	kernel_uarg->uspace_thread_arg = NULL;

	kernel_uarg->uspace_uarg = NULL;

	task = task_create(as, name);

	ASSERT(task);

	/*

	 * Create the data as_area.

	 */

	a = as_area_create(as, AS_AREA_READ | AS_AREA_WRITE, LOADED_PROG_STACK_PAGES_NO*PAGE_SIZE,

		USTACK_ADDRESS, AS_AREA_ATTR_NONE);

	t = thread_create(uinit, kernel_uarg, task, 0, "uinit");

	ASSERT(t);

	thread_ready(t);

	return task;

}

/** Syscall for reading task ID from userspace.

 *

 * @param uaddr Userspace address of 8-byte buffer where to store current task ID.

 *

 * @return Always returns 0.

 */

__native sys_task_get_id(task_id_t *uspace_task_id)

{

	/*

	 * No need to acquire lock on TASK because taskid

	 * remains constant for the lifespan of the task.

	 */

	copy_to_uspace(uspace_task_id, &TASK->taskid, sizeof(TASK->taskid));

	return 0;

}

/** Find task structure corresponding to task ID.

 *

 * The tasks_lock must be already held by the caller of this function

 * and interrupts must be disabled.

 *

 * @param id Task ID.

 *

 * @return Task structure address or NULL if there is no such task ID.

 */

task_t *task_find_by_id(task_id_t id)

{

	btree_node_t *leaf;

	return (task_t *) btree_search(&tasks_btree, (btree_key_t) id, &leaf);

}

/** Print task list */

void task_print_list(void)

{

	link_t *cur;

	ipl_t ipl;

	/* Messing with thread structures, avoid deadlock */

	ipl = interrupts_disable();

	spinlock_lock(&tasks_lock);

	for (cur = tasks_btree.leaf_head.next; cur != &tasks_btree.leaf_head; cur = cur->next) {

		btree_node_t *node;

		int i;

		node = list_get_instance(cur, btree_node_t, leaf_link);

		for (i = 0; i < node->keys; i++) {

			task_t *t;

			int j;

			t = (task_t *) node->value[i];

			spinlock_lock(&t->lock);

			printf("%s: address=%#zX, taskid=%#llX, as=%#zX, ActiveCalls: %zd",

				t->name, t, t->taskid, t->as, atomic_get(&t->active_calls));

			for (j=0; j < IPC_MAX_PHONES; j++) {

				if (t->phones[j].callee)

					printf(" Ph(%zd): %#zX ", j, t->phones[j].callee);

			}

			printf("\n");

			spinlock_unlock(&t->lock);

		}

	}

	spinlock_unlock(&tasks_lock);

	interrupts_restore(ipl);

}