1 .. SPDX-License-Identifier: GPL-2.0 2 3 ========= 4 Zero Page 5 ========= 6 The additional fields in struct boot_params as a part of 32-bit boot 7 protocol of kernel. These should be filled by bootloader or 16-bit 8 real-mode setup code of the kernel. References/settings to it mainly 9 are in:: 10 11 arch/x86/include/uapi/asm/bootparam.h 12 13 =========== ===== ======================= ================================================= 14 Offset/Size Proto Name Meaning 15 16 000/040 ALL screen_info Text mode or frame buffer information 17 (struct screen_info) 18 040/014 ALL apm_bios_info APM BIOS information (struct apm_bios_info) 19 058/008 ALL tboot_addr Physical address of tboot shared page 20 060/010 ALL ist_info Intel SpeedStep (IST) BIOS support information 21 (struct ist_info) 22 070/008 ALL acpi_rsdp_addr Physical address of ACPI RSDP table 23 080/010 ALL hd0_info hd0 disk parameter, OBSOLETE!! 24 090/010 ALL hd1_info hd1 disk parameter, OBSOLETE!! 25 0A0/010 ALL sys_desc_table System description table (struct sys_desc_table), 26 OBSOLETE!! 27 0B0/010 ALL olpc_ofw_header OLPC's OpenFirmware CIF and friends 28 0C0/004 ALL ext_ramdisk_image ramdisk_image high 32bits 29 0C4/004 ALL ext_ramdisk_size ramdisk_size high 32bits 30 0C8/004 ALL ext_cmd_line_ptr cmd_line_ptr high 32bits 31 13C/004 ALL cc_blob_address Physical address of Confidential Computing blob 32 140/080 ALL edid_info Video mode setup (struct edid_info) 33 1C0/020 ALL efi_info EFI 32 information (struct efi_info) 34 1E0/004 ALL alt_mem_k Alternative mem check, in KB 35 1E4/004 ALL scratch Scratch field for the kernel setup code 36 1E8/001 ALL e820_entries Number of entries in e820_table (below) 37 1E9/001 ALL eddbuf_entries Number of entries in eddbuf (below) 38 1EA/001 ALL edd_mbr_sig_buf_entries Number of entries in edd_mbr_sig_buffer 39 (below) 40 1EB/001 ALL kbd_status Numlock is enabled 41 1EC/001 ALL secure_boot Secure boot is enabled in the firmware 42 1EF/001 ALL sentinel Used to detect broken bootloaders 43 290/040 ALL edd_mbr_sig_buffer EDD MBR signatures 44 2D0/A00 ALL e820_table E820 memory map table 45 (array of struct e820_entry) 46 D00/1EC ALL eddbuf EDD data (array of struct edd_info) 47 =========== ===== ======================= =================================================
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