tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1The additional fields in struct boot_params as a part of 32-bit boot
2protocol of kernel. These should be filled by bootloader or 16-bit
3real-mode setup code of the kernel. References/settings to it mainly
4are in:
5
6 arch/x86/include/asm/bootparam.h
7
8
9Offset Proto Name Meaning
10/Size
11
12000/040 ALL screen_info Text mode or frame buffer information
13 (struct screen_info)
14040/014 ALL apm_bios_info APM BIOS information (struct apm_bios_info)
15058/008 ALL tboot_addr Physical address of tboot shared page
16060/010 ALL ist_info Intel SpeedStep (IST) BIOS support information
17 (struct ist_info)
18080/010 ALL hd0_info hd0 disk parameter, OBSOLETE!!
19090/010 ALL hd1_info hd1 disk parameter, OBSOLETE!!
200A0/010 ALL sys_desc_table System description table (struct sys_desc_table)
210B0/010 ALL olpc_ofw_header OLPC's OpenFirmware CIF and friends
22140/080 ALL edid_info Video mode setup (struct edid_info)
231C0/020 ALL efi_info EFI 32 information (struct efi_info)
241E0/004 ALL alk_mem_k Alternative mem check, in KB
251E4/004 ALL scratch Scratch field for the kernel setup code
261E8/001 ALL e820_entries Number of entries in e820_map (below)
271E9/001 ALL eddbuf_entries Number of entries in eddbuf (below)
281EA/001 ALL edd_mbr_sig_buf_entries Number of entries in edd_mbr_sig_buffer
29 (below)
30290/040 ALL edd_mbr_sig_buffer EDD MBR signatures
312D0/A00 ALL e820_map E820 memory map table
32 (array of struct e820entry)
33D00/1EC ALL eddbuf EDD data (array of struct edd_info)