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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 include/asm-x86/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)