module syscall;

/*
    This module handles all the system calls from user space.
*/

enum {
    SendMsg = 1,
    ReceiveMsg = 2,

} syscall_t;

// System call handlers. System calls are made from user space.
func void handle_system_call(int callId, int a, int b, int c, int d)
{
    // Main entry, check what to do here
    switch(callId)
    {
        case SendMsg:
            handle_send_msg();
            proc = process.byId(a);
            if (not proc)
            {
                panic();
            }

            proc.setMessage();
            scheduler.current.setState(Sleep);
            break;
        case ReceiveMsg:
            break;
        case Reboot:
            arch.reboot();
            break;
        default:
            return NO_SUCH_CALL;
    }

    return OK;
}

// Handle send message syscall
func void handle_send_msg()
{
    p = process.byId(msg.to_id);
    scheduler.attempt(p);
}

func handle_recv_msg()
{
    // Block until we have a message
    currentProc->setState(Sleep);
    scheduler.executeNext();
}

func handle_reboot()
{
    reboot();
}