cd LinuxKernel/linux-3.9.4
cd mykernel
vi mymain.c
vi  myinterrupt.c
vi mypcb.h
cd ..
make allnoconfig
make

    int pid = 0;int i;/* Initialize process 0*/task[pid].pid = pid;/*进程0*/task[pid].state = 0;/* -1 unrunnable, 0 runnable, >0 stopped 进程0的初始状态为可运行 */task[pid].task_entry = task[pid].thread.ip = (unsigned long)my_process;/*进程0的eip指向my_process*/task[pid].thread.sp = (unsigned long)&task[pid].stack[KERNEL_STACK_SIZE-1];/*初始时sp指向分配给进程0的堆栈的最高地址*/task[pid].next = &task[pid];/*初始进程0的下一个进程是进程0*/

    task[i].state = -1;/*进程1,2,3的初始状态不可执行*/

    task[i].next = task[i-1].next;task[i-1].next = &task[i];

   /* start process 0 by task[0] */pid = 0;my_current_task = &task[pid];asm volatile("movl %1,%%esp\n\t" /* set task[pid].thread.sp to esp */"pushl %1\n\t" /* push ebp */"pushl %0\n\t" /* push task[pid].thread.ip */"ret\n\t" /* pop task[pid].thread.ip to eip */"popl %%ebp\n\t":: "c" (task[pid].thread.ip),"d" (task[pid].thread.sp) /* input c or d mean %ecx/%edx*/);

     if(i%10000000 == 0)
          {
              printk(KERN_NOTICE "this is process %d -\n",my_current_task->pid);
              if(my_need_sched == 1)
              {
 my_need_sched = 0;/*置为0，不能进行进程调度，直到再次发生时钟中断置为1*/
 my_schedule();
              }
 printk(KERN_NOTICE "this is process %d +\n",my_current_task->pid);          }

    if(time_count%1000 == 0 && my_need_sched != 1){printk(KERN_NOTICE ">>>my_timer_handler here<<<\n");my_need_sched = 1;/*置为1*/}

   else{next->state = 0;my_current_task = next;printk(KERN_NOTICE ">>>switch %d to %d<<<\n",prev->pid,next->pid);
        /* switch to new process */asm volatile(
            "pushl %%ebp\n\t" /* save ebp */
            "movl %%esp,%0\n\t" /* save esp */
            "movl %2,%%esp\n\t" /* restore esp */
            "movl %2,%%ebp\n\t" /* restore ebp */
            "movl $1f,%1\n\t" /* save eip */
            "pushl %3\n\t"
            "ret\n\t" /* restore eip */: "=m" (prev->thread.sp),"=m" (prev->thread.ip): "m" (next->thread.sp),"m" (next->thread.ip));}

   if(next->state == 0)/* -1 unrunnable, 0 runnable, >0 stopped */{
        /* switch to next process */asm volatile("pushl %%ebp\n\t" /* save ebp */"movl %%esp,%0\n\t" /* save esp */
 　　　　　　"movl %2,%%esp\n\t" /* restore esp */"movl $1f,%1\n\t" /* save eip */    "pushl %3\n\t""ret\n\t" /* restore eip */"1:\t" /* next process start here */"popl %%ebp\n\t": "=m" (prev->thread.sp),"=m" (prev->thread.ip): "m" (next->thread.sp),"m" (next->thread.ip));my_current_task = next;printk(KERN_NOTICE ">>>switch %d to %d<<<\n",prev->pid,next->pid);}