1*ff61f079SJonathan Corbet.. SPDX-License-Identifier: GPL-2.0 2*ff61f079SJonathan Corbet 3*ff61f079SJonathan Corbet========= 4*ff61f079SJonathan CorbetZero Page 5*ff61f079SJonathan Corbet========= 6*ff61f079SJonathan CorbetThe additional fields in struct boot_params as a part of 32-bit boot 7*ff61f079SJonathan Corbetprotocol of kernel. These should be filled by bootloader or 16-bit 8*ff61f079SJonathan Corbetreal-mode setup code of the kernel. References/settings to it mainly 9*ff61f079SJonathan Corbetare in:: 10*ff61f079SJonathan Corbet 11*ff61f079SJonathan Corbet arch/x86/include/uapi/asm/bootparam.h 12*ff61f079SJonathan Corbet 13*ff61f079SJonathan Corbet=========== ===== ======================= ================================================= 14*ff61f079SJonathan CorbetOffset/Size Proto Name Meaning 15*ff61f079SJonathan Corbet 16*ff61f079SJonathan Corbet000/040 ALL screen_info Text mode or frame buffer information 17*ff61f079SJonathan Corbet (struct screen_info) 18*ff61f079SJonathan Corbet040/014 ALL apm_bios_info APM BIOS information (struct apm_bios_info) 19*ff61f079SJonathan Corbet058/008 ALL tboot_addr Physical address of tboot shared page 20*ff61f079SJonathan Corbet060/010 ALL ist_info Intel SpeedStep (IST) BIOS support information 21*ff61f079SJonathan Corbet (struct ist_info) 22*ff61f079SJonathan Corbet070/008 ALL acpi_rsdp_addr Physical address of ACPI RSDP table 23*ff61f079SJonathan Corbet080/010 ALL hd0_info hd0 disk parameter, OBSOLETE!! 24*ff61f079SJonathan Corbet090/010 ALL hd1_info hd1 disk parameter, OBSOLETE!! 25*ff61f079SJonathan Corbet0A0/010 ALL sys_desc_table System description table (struct sys_desc_table), 26*ff61f079SJonathan Corbet OBSOLETE!! 27*ff61f079SJonathan Corbet0B0/010 ALL olpc_ofw_header OLPC's OpenFirmware CIF and friends 28*ff61f079SJonathan Corbet0C0/004 ALL ext_ramdisk_image ramdisk_image high 32bits 29*ff61f079SJonathan Corbet0C4/004 ALL ext_ramdisk_size ramdisk_size high 32bits 30*ff61f079SJonathan Corbet0C8/004 ALL ext_cmd_line_ptr cmd_line_ptr high 32bits 31*ff61f079SJonathan Corbet13C/004 ALL cc_blob_address Physical address of Confidential Computing blob 32*ff61f079SJonathan Corbet140/080 ALL edid_info Video mode setup (struct edid_info) 33*ff61f079SJonathan Corbet1C0/020 ALL efi_info EFI 32 information (struct efi_info) 34*ff61f079SJonathan Corbet1E0/004 ALL alt_mem_k Alternative mem check, in KB 35*ff61f079SJonathan Corbet1E4/004 ALL scratch Scratch field for the kernel setup code 36*ff61f079SJonathan Corbet1E8/001 ALL e820_entries Number of entries in e820_table (below) 37*ff61f079SJonathan Corbet1E9/001 ALL eddbuf_entries Number of entries in eddbuf (below) 38*ff61f079SJonathan Corbet1EA/001 ALL edd_mbr_sig_buf_entries Number of entries in edd_mbr_sig_buffer 39*ff61f079SJonathan Corbet (below) 40*ff61f079SJonathan Corbet1EB/001 ALL kbd_status Numlock is enabled 41*ff61f079SJonathan Corbet1EC/001 ALL secure_boot Secure boot is enabled in the firmware 42*ff61f079SJonathan Corbet1EF/001 ALL sentinel Used to detect broken bootloaders 43*ff61f079SJonathan Corbet290/040 ALL edd_mbr_sig_buffer EDD MBR signatures 44*ff61f079SJonathan Corbet2D0/A00 ALL e820_table E820 memory map table 45*ff61f079SJonathan Corbet (array of struct e820_entry) 46*ff61f079SJonathan CorbetD00/1EC ALL eddbuf EDD data (array of struct edd_info) 47*ff61f079SJonathan Corbet=========== ===== ======================= ================================================= 48