I386中bootloader与kernel之间的信息交换

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有些信息需要从bootloader传递到内核中，empty_zero_page是i386交换信息的场所。

下面这段话来自于Documentation/i386/zero-page.txt

Summary of empty_zero_page layout (kernel point of view)
     ( collected by Hans Lermen and Martin Mares )
 
The contents of empty_zero_page are used to pass parameters from the
16-bit realmode code of the kernel to the 32-bit part. References/settings
to it mainly are in:

  arch/i386/boot/setup.S
  arch/i386/boot/video.S
  arch/i386/kernel/head.S
  arch/i386/kernel/setup.c
 

Offset    Type        Description
------  ----        -----------
    0    32 bytes    struct screen_info, SCREEN_INFO
            ATTENTION, overlaps the following !!!
    2    unsigned short    EXT_MEM_K, extended memory size in Kb (from int 0x15)
 0x20    unsigned short    CL_MAGIC, commandline magic number (=0xA33F)
 0x22    unsigned short    CL_OFFSET, commandline offset

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