1 The additional fields in struct boot_params as a part of 32-bit boot
2 protocol of kernel. These should be filled by bootloader or 16-bit
3 real-mode setup code of the kernel. References/settings to it mainly
6 arch/x86/include/uapi/asm/bootparam.h
9 Offset Proto Name Meaning
12 000/040 ALL screen_info Text mode or frame buffer information
14 040/014 ALL apm_bios_info APM BIOS information (struct apm_bios_info)
15 058/008 ALL tboot_addr Physical address of tboot shared page
16 060/010 ALL ist_info Intel SpeedStep (IST) BIOS support information
18 080/010 ALL hd0_info hd0 disk parameter, OBSOLETE!!
19 090/010 ALL hd1_info hd1 disk parameter, OBSOLETE!!
20 0A0/010 ALL sys_desc_table System description table (struct sys_desc_table)
21 0B0/010 ALL olpc_ofw_header OLPC's OpenFirmware CIF and friends
22 0C0/004 ALL ext_ramdisk_image ramdisk_image high 32bits
23 0C4/004 ALL ext_ramdisk_size ramdisk_size high 32bits
24 0C8/004 ALL ext_cmd_line_ptr cmd_line_ptr high 32bits
25 140/080 ALL edid_info Video mode setup (struct edid_info)
26 1C0/020 ALL efi_info EFI 32 information (struct efi_info)
27 1E0/004 ALL alk_mem_k Alternative mem check, in KB
28 1E4/004 ALL scratch Scratch field for the kernel setup code
29 1E8/001 ALL e820_entries Number of entries in e820_map (below)
30 1E9/001 ALL eddbuf_entries Number of entries in eddbuf (below)
31 1EA/001 ALL edd_mbr_sig_buf_entries Number of entries in edd_mbr_sig_buffer
33 1EF/001 ALL sentinel Used to detect broken bootloaders
34 290/040 ALL edd_mbr_sig_buffer EDD MBR signatures
35 2D0/A00 ALL e820_map E820 memory map table
36 (array of struct e820entry)
37 D00/1EC ALL eddbuf EDD data (array of struct edd_info)