屏蔽linux启动信息

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屏蔽linux启动信息，其实从细节上来讲，包括3部分

1 grub信息

2 kernel信息

3 application 信息

 后面两个信息可以通过在grub中传递 CONSOLE=/dev/null 和 console=/dev/null实现屏蔽，但是从grub启动后仍然会出现如

 

"Booting Gentoo Linux 2.6.23 r3"

root (hd0,0)

kernel /boot/kernle-2.6.23-gentoo-r3 root=/dev/sda3

Linux setup  size

 

等字样

因为这是grub打印出来的信息，所以只能从grub自身着手，修改grub 代码，不输出这部分信息

 

首先去除 Booting字样，这是在grub/stage2/stage2.c boot_entry: 段落中输出

 

{
      if (config_entries)
        printf (" Booting  Lynn Linux,pls waiting ^_^ \n");
// printf (" Booting1 \'%s\'\n\n",
// get_entry (menu_entries, first_entry + entryno, 0));
      else
        printf (" Booting  Lynn Linux ,pls waiting ^_^\n");
// printf (" Booting1 command-list\n\n");



把grub_printf注释掉，就可以了

在stage2/cmdline.c中

builtin = find_command (heap);
      if (! builtin)
        {
// grub_printf ("%s\n", old_entry);

          continue;
        }

      if (! (builtin->flags & BUILTIN_NO_ECHO))
// grub_printf ("%s\n", old_entry);


      /* If BUILTIN cannot be run in the command-line, skip it. */
      if (! (builtin->flags & BUILTIN_CMDLINE))
        {
          errnum = ERR_UNRECOGNIZED;
          continue;
        }

      /* Invalidate the cache, because the user may exchange removable
         disks. */
      buf_drive = -1;


这样，就屏蔽了第二部分信息

第三部分信息是在 stage2/boot.c中

if (! big_linux
          && text_len > linux_data_real_addr - (char *) LINUX_ZIMAGE_ADDR)
        {
          grub_printf (" linux 'zImage' kernel too big, try 'make bzImage'\n");
          errnum = ERR_WONT_FIT;
        }
      else if (linux_data_real_addr + LINUX_SETUP_MOVE_SIZE
               > RAW_ADDR ((char *) (mbi.mem_lower << 10)))
        errnum = ERR_WONT_FIT;
      else
        {
// grub_printf(" lynn linux image \n");

// grub_printf (" [Linux-%s, setup=0x%x, size=0x%x]\n",

// (big_linux ? "bzImage" : "zImage"), data_len, text_len);


          /* Video mode selection support. What a mess! */
          /* NOTE: Even the word "mess" is not still enough to
             represent how wrong and bad the Linux video support is,
             but I don't want to hear complaints from Linux fanatics
             any more. -okuji */


 

 

这样，通过修改grub代码和穿参数给kernel，就可以屏蔽linux 启动信息了，当然如果你甚至不想要grub菜单出现，那么也是可以实现的，因为菜单是通过grub打印的，所以也只有修改grub 代码可以做到，这里就不再介绍了。