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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/slab.h>

#include <synch/spinlock.h>

#include <arch.h>

#include <panic.h>

#include <adt/list.h>

#include <ipc/ipc.h>

#include <memstr.h>

#include <print.h>

#include <elf.h>

SPINLOCK_INITIALIZE(tasks_lock);

LIST_INITIALIZE(tasks_head);

static task_id_t task_counter = 0;

/** Initialize tasks

 *

 * Initialize kernel tasks support.

 *

 */

void task_init(void)

{

    TASK = NULL;

}

/** 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);

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

    list_initialize(&ta->th_head);

    list_initialize(&ta->tasks_link);

    ta->as = as;

    ta->name = name;

    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);

    ipl = interrupts_disable();

    spinlock_lock(&tasks_lock);

    ta->taskid = ++task_counter;

    list_append(&ta->tasks_link, &tasks_head);

    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);

    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);

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

    /*

     * Create the data as_area.

     */

    a = as_area_create(as, AS_AREA_READ | AS_AREA_WRITE, PAGE_SIZE, USTACK_ADDRESS);

    thread_ready(t);

    return task;

}

/** Print task list */

void task_print_list(void)

{

    link_t *cur;

    task_t *t;

    ipl_t ipl;

    int i;

    /* Messing with thread structures, avoid deadlock */

    ipl = interrupts_disable();

    spinlock_lock(&tasks_lock);

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

        t = list_get_instance(cur, task_t, tasks_link);

        spinlock_lock(&t->lock);

        printf("%s: address=%P, taskid=%Q, as=%P, ActiveCalls: %d",

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

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

            if (t->phones[i].callee)

                printf(" Ph(%d): %P ", i,t->phones[i].callee);

        }

        printf("\n");

        spinlock_unlock(&t->lock);

    }

    spinlock_unlock(&tasks_lock);

    interrupts_restore(ipl);

}