Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1.. SPDX-License-Identifier: GPL-2.0
2
3=========
4Zero Page
5=========
6The additional fields in struct boot_params as a part of 32-bit boot
7protocol of kernel. These should be filled by bootloader or 16-bit
8real-mode setup code of the kernel. References/settings to it mainly
9are in::
10
11 arch/x86/include/uapi/asm/bootparam.h
12
13=========== ===== ======================= =================================================
14Offset/Size Proto Name Meaning
15
16000/040 ALL screen_info Text mode or frame buffer information
17 (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 page
20060/010 ALL ist_info Intel SpeedStep (IST) BIOS support information
21 (struct ist_info)
22070/008 ALL acpi_rsdp_addr Physical address of ACPI RSDP table
23080/010 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 friends
280C0/004 ALL ext_ramdisk_image ramdisk_image high 32bits
290C4/004 ALL ext_ramdisk_size ramdisk_size high 32bits
300C8/004 ALL ext_cmd_line_ptr cmd_line_ptr high 32bits
3113C/004 ALL cc_blob_address Physical address of Confidential Computing blob
32140/080 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 KB
351E4/004 ALL scratch Scratch field for the kernel setup code
361E8/001 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_buffer
39 (below)
401EB/001 ALL kbd_status Numlock is enabled
411EC/001 ALL secure_boot Secure boot is enabled in the firmware
421EF/001 ALL sentinel Used to detect broken bootloaders
43290/040 ALL edd_mbr_sig_buffer EDD MBR signatures
442D0/A00 ALL e820_table E820 memory map table
45 (array of struct e820_entry)
46D00/1EC ALL eddbuf EDD data (array of struct edd_info)
47=========== ===== ======================= =================================================