linux/Documentation/x86/zero-page.txt
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   1The additional fields in struct boot_params as a part of 32-bit boot
   2protocol of kernel. These should be filled by bootloader or 16-bit
   3real-mode setup code of the kernel. References/settings to it mainly
   4are in:
   5
   6  arch/x86/include/asm/bootparam.h
   7
   8
   9Offset  Proto   Name            Meaning
  10/Size
  11
  12000/040 ALL     screen_info     Text mode or frame buffer information
  13                                (struct screen_info)
  14040/014 ALL     apm_bios_info   APM BIOS information (struct apm_bios_info)
  15060/010 ALL     ist_info        Intel SpeedStep (IST) BIOS support information
  16                                (struct ist_info)
  17080/010 ALL     hd0_info        hd0 disk parameter, OBSOLETE!!
  18090/010 ALL     hd1_info        hd1 disk parameter, OBSOLETE!!
  190A0/010 ALL     sys_desc_table  System description table (struct sys_desc_table)
  20140/080 ALL     edid_info       Video mode setup (struct edid_info)
  211C0/020 ALL     efi_info        EFI 32 information (struct efi_info)
  221E0/004 ALL     alk_mem_k       Alternative mem check, in KB
  231E4/004 ALL     scratch         Scratch field for the kernel setup code
  241E8/001 ALL     e820_entries    Number of entries in e820_map (below)
  251E9/001 ALL     eddbuf_entries  Number of entries in eddbuf (below)
  261EA/001 ALL     edd_mbr_sig_buf_entries Number of entries in edd_mbr_sig_buffer
  27                                (below)
  28290/040 ALL     edd_mbr_sig_buffer EDD MBR signatures
  292D0/A00 ALL     e820_map        E820 memory map table
  30                                (array of struct e820entry)
  31D00/1EC ALL     eddbuf          EDD data (array of struct edd_info)
  32