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/*
 * Copyright (C) 2005 Martin Decky
 * 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.
 */

/**
 * @file    syscall.c
 * @brief   Syscall table and syscall wrappers.
 */
 
#include <syscall/syscall.h>
#include <proc/thread.h>
#include <proc/task.h>
#include <mm/as.h>
#include <print.h>
#include <putchar.h>
#include <errno.h>
#include <arch.h>
#include <debug.h>
#include <ipc/sysipc.h>
#include <synch/futex.h>
#include <ddi/ddi.h>

static __native sys_io(int fd, const void * buf, size_t count) {
    
    // TODO: buf sanity checks and a lot of other stuff ...

    size_t i;
    
    for (i = 0; i < count; i++)
        putchar(((char *) buf)[i]);
    
    return count;
}

static __native sys_preempt_control(int enable)
{
    if (! cap_get(TASK) & CAP_PREEMPT_CONTROL)
        return EPERM;
    if (enable)
        preemption_enable();
    else
        preemption_disable();
    return 0;
}

/** Dispatch system call */
__native syscall_handler(__native a1, __native a2, __native a3,
             __native a4, __native id)
{
    if (id < SYSCALL_END)
        return syscall_table[id](a1,a2,a3,a4);
    else
        panic("Undefined syscall %d", id);
}

syshandler_t syscall_table[SYSCALL_END] = {
    sys_io,
    sys_tls_set,
    sys_preempt_control,

    /* Thread and task related syscalls. */
    sys_thread_create,
    sys_thread_exit,
    sys_task_get_id,
    
    /* Synchronization related syscalls. */
    sys_futex_sleep_timeout,
    sys_futex_wakeup,
    
    /* Address space related syscalls. */
    sys_as_area_create,
    sys_as_area_resize,
    sys_as_area_accept,
    sys_as_area_send,

    /* IPC related syscalls. */
    sys_ipc_call_sync_fast,
    sys_ipc_call_sync,
    sys_ipc_call_async_fast,
    sys_ipc_call_async,
    sys_ipc_answer_fast,
    sys_ipc_answer,
    sys_ipc_forward_fast,
    sys_ipc_wait_for_call,
    sys_ipc_hangup,
    sys_ipc_register_irq,
    sys_ipc_unregister_irq,

    /* DDI related syscalls. */
    sys_physmem_map,
    sys_iospace_enable
};