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1.. SPDX-License-Identifier: GPL-2.02 3=========4Zero Page5=========6The additional fields in struct boot_params as a part of 32-bit boot7protocol of kernel. These should be filled by bootloader or 16-bit8real-mode setup code of the kernel. References/settings to it mainly9are in::10 11 arch/x86/include/uapi/asm/bootparam.h12 13=========== ===== ======================= =================================================14Offset/Size Proto Name Meaning15 16000/040 ALL screen_info Text mode or frame buffer information17 (struct screen_info)18040/014 ALL apm_bios_info APM BIOS information (struct apm_bios_info)19058/008 ALL tboot_addr Physical address of tboot shared page20060/010 ALL ist_info Intel SpeedStep (IST) BIOS support information21 (struct ist_info)22070/008 ALL acpi_rsdp_addr Physical address of ACPI RSDP table23080/010 ALL hd0_info hd0 disk parameter, OBSOLETE!!24090/010 ALL hd1_info hd1 disk parameter, OBSOLETE!!250A0/010 ALL sys_desc_table System description table (struct sys_desc_table),26 OBSOLETE!!270B0/010 ALL olpc_ofw_header OLPC's OpenFirmware CIF and friends280C0/004 ALL ext_ramdisk_image ramdisk_image high 32bits290C4/004 ALL ext_ramdisk_size ramdisk_size high 32bits300C8/004 ALL ext_cmd_line_ptr cmd_line_ptr high 32bits3113C/004 ALL cc_blob_address Physical address of Confidential Computing blob32140/080 ALL edid_info Video mode setup (struct edid_info)331C0/020 ALL efi_info EFI 32 information (struct efi_info)341E0/004 ALL alt_mem_k Alternative mem check, in KB351E4/004 ALL scratch Scratch field for the kernel setup code361E8/001 ALL e820_entries Number of entries in e820_table (below)371E9/001 ALL eddbuf_entries Number of entries in eddbuf (below)381EA/001 ALL edd_mbr_sig_buf_entries Number of entries in edd_mbr_sig_buffer39 (below)401EB/001 ALL kbd_status Numlock is enabled411EC/001 ALL secure_boot Secure boot is enabled in the firmware421EF/001 ALL sentinel Used to detect broken bootloaders43290/040 ALL edd_mbr_sig_buffer EDD MBR signatures442D0/A00 ALL e820_table E820 memory map table45 (array of struct e820_entry)46D00/1EC ALL eddbuf EDD data (array of struct edd_info)47=========== ===== ======================= =================================================48