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/*
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 * Copyright (C) 2006 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#include <thread.h>
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#include <libc.h>
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#include <stdlib.h>
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#include <arch/faddr.h>
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#include <kernel/proc/uarg.h>
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#include <psthread.h>
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#include <string.h>
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#include <stdio.h>
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#ifndef THREAD_INITIAL_STACK_PAGES_NO
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#define THREAD_INITIAL_STACK_PAGES_NO 1
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#endif
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extern char _tdata_start;
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extern char _tdata_end;
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extern char _tbss_start;
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extern char _tbss_end;
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/** Create Thread Local storage area, return pointer to TCB(ThreadControlBlock)
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 *
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 * !! The code requires, that sections .tdata and .tbss are adjacent.
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 *    It may be changed in the future.
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 */
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tcb_t * __make_tls(void)
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{
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    void *data;
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    tcb_t *tcb;
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    size_t tls_size = &_tbss_end - &_tdata_start;
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    tcb = __alloc_tls(&data, tls_size);
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    memcpy(data, &_tdata_start, &_tdata_end - &_tdata_start);
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    memset(data + (&_tbss_start-&_tdata_start), &_tbss_end-&_tbss_start, 0);
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    return tcb;
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}
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void __free_tls(tcb_t *tcb)
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{
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    size_t tls_size = &_tbss_end - &_tdata_start;
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    __free_tls_arch(tcb, tls_size);
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}
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/** Main thread function.
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 *
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 * This function is called from __thread_entry() and is used
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 * to call the thread's implementing function and perform cleanup
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 * and exit when thread returns back. Do not call this function
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 * directly.
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 *
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 * @param uarg Pointer to userspace argument structure.
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 */
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void __thread_main(uspace_arg_t *uarg)
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{
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    tcb_t *tcb;
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    /* This should initialize the area according to TLS specicification */
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    tcb = __make_tls();
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    __tcb_set(tcb);
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    psthread_setup(tcb);
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    uarg->uspace_thread_function(uarg->uspace_thread_arg);
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    free(uarg->uspace_stack);
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    free(uarg);
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    psthread_teardown(tcb->pst_data);
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    __free_tls(tcb);
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    thread_exit(0);
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}
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/** Create userspace thread.
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 *
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 * This function creates new userspace thread and allocates userspace
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 * stack and userspace argument structure for it.
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 *
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 * @param function Function implementing the thread.
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 * @param arg Argument to be passed to thread.
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 * @param name Symbolic name of the thread.
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 *
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 * @param TID of the new thread on success or -1 on failure.
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 */
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int thread_create(void (* function)(void *), void *arg, char *name)
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{
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    char *stack;
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    uspace_arg_t *uarg;
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    stack = (char *) malloc(getpagesize()*THREAD_INITIAL_STACK_PAGES_NO);
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    if (!stack)
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        return -1;
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    uarg = (uspace_arg_t *) malloc(sizeof(uspace_arg_t));
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    if (!uarg) {
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        free(stack);
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        return -1;
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    }
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    uarg->uspace_entry = (void *) FADDR(__thread_entry);
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    uarg->uspace_stack = (void *) stack;
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    uarg->uspace_thread_function = function;
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    uarg->uspace_thread_arg = arg;
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    uarg->uspace_uarg = uarg;
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    return __SYSCALL2(SYS_THREAD_CREATE, (sysarg_t) uarg, (sysarg_t) name);
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}
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/** Terminate current thread.
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 *
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 * @param stat Exit status. Currently not used.
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 */
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void thread_exit(int status)
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{
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    __SYSCALL1(SYS_THREAD_EXIT, (sysarg_t) status);
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}