Based on kernel version 4.16.1. Page generated on 2018-04-09 11:53 EST.
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 4 are in: 5 6 arch/x86/include/uapi/asm/bootparam.h 7 8 9 Offset Proto Name Meaning 10 /Size 11 12 000/040 ALL screen_info Text mode or frame buffer information 13 (struct screen_info) 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 17 (struct ist_info) 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 OBSOLETE!! 22 0B0/010 ALL olpc_ofw_header OLPC's OpenFirmware CIF and friends 23 0C0/004 ALL ext_ramdisk_image ramdisk_image high 32bits 24 0C4/004 ALL ext_ramdisk_size ramdisk_size high 32bits 25 0C8/004 ALL ext_cmd_line_ptr cmd_line_ptr high 32bits 26 140/080 ALL edid_info Video mode setup (struct edid_info) 27 1C0/020 ALL efi_info EFI 32 information (struct efi_info) 28 1E0/004 ALL alk_mem_k Alternative mem check, in KB 29 1E4/004 ALL scratch Scratch field for the kernel setup code 30 1E8/001 ALL e820_entries Number of entries in e820_table (below) 31 1E9/001 ALL eddbuf_entries Number of entries in eddbuf (below) 32 1EA/001 ALL edd_mbr_sig_buf_entries Number of entries in edd_mbr_sig_buffer 33 (below) 34 1EB/001 ALL kbd_status Numlock is enabled 35 1EC/001 ALL secure_boot Secure boot is enabled in the firmware 36 1EF/001 ALL sentinel Used to detect broken bootloaders 37 290/040 ALL edd_mbr_sig_buffer EDD MBR signatures 38 2D0/A00 ALL e820_table E820 memory map table 39 (array of struct e820_entry) 40 D00/1EC ALL eddbuf EDD data (array of struct edd_info)