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# ls
hello.c hello.o hello

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# **
*****.* *****.* *****

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# ls
hello.c hello.o hello

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# **
*****.* *****.* *****

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...
key_table:
	.long none,do_self,do_self,do_self	/* 00-03 s0 esc 1 2 */
	.long do_self,do_self,do_self,do_self	/* 04-07 3 4 5 6 */
	.long do_self,do_self,do_self,do_self	/* 08-0B 7 8 9 0 */
	.long do_self,do_self,do_self,do_self	/* 0C-0F + ' bs tab */
	.long do_self,do_self,do_self,do_self	/* 10-13 q w e r */
	.long do_self,do_self,do_self,do_self	/* 14-17 t y u i */
	.long do_self,do_self,do_self,do_self	/* 18-1B o p } ^ */
	.long do_self,ctrl,do_self,do_self	/* 1C-1F enter ctrl a s */
	.long do_self,do_self,do_self,do_self	/* 20-23 d f g h */
	.long do_self,do_self,do_self,do_self	/* 24-27 j k l | */
	.long do_self,do_self,lshift,do_self	/* 28-2B { para lshift , */
	.long do_self,do_self,do_self,do_self	/* 2C-2F z x c v */
	.long do_self,do_self,do_self,do_self	/* 30-33 b n m , */
	.long do_self,minus,rshift,do_self	/* 34-37 . - rshift * */
	.long alt,do_self,caps,func		/* 38-3B alt sp caps f1 */
	.long func,func,func,func		/* 3C-3F f2 f3 f4 f5 */
	.long func,func,func,func		/* 40-43 f6 f7 f8 f9 */
	.long func,num,scroll,cursor		/* 44-47 f10 num scr home */
	.long cursor,cursor,do_self,cursor	/* 48-4B up pgup - left */
	.long cursor,cursor,do_self,cursor	/* 4C-4F n5 right + end */
	.long cursor,cursor,cursor,cursor	/* 50-53 dn pgdn ins del */
	.long none,none,do_self,func		/* 54-57 sysreq ? < f11 */
	.long func,none,none,none		/* 58-5B f12 ? ? ? */           /*  <---- 在这个注释我们就能找到F12对应的例程*/
	.long none,none,none,none		/* 5C-5F ? ? ? ? */
...

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newfunc:
	pushl	%eax
	pushl %ecx
	pushl %edx
	call 	f12func
	popl 	%edx
	popl 	%ecx
	popl 	%eax
	ret

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int flag = 0;
void f12func()
{
	flag ^= 1;
  return ;
}


...
void con_write(struct tty_struct * tty)
{
	int nr;
	char c;

	nr = CHARS(tty->write_q);
	while (nr--) {
		GETCH(tty->write_q,c);
		switch(state) {
			case 0:
				if (c>31 && c<127) {
        	//这里作出更改
          if (flag){
            c = '*';
          }
					if (x>=video_num_columns) {
						x -= video_num_columns;
						pos -= video_size_row;
						lf();
					}
	...

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void f12func();