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0c2d3639 CD |
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 | 080/010 ALL hd0_info hd0 disk parameter, OBSOLETE!! | |
23 | 090/010 ALL hd1_info hd1 disk parameter, OBSOLETE!! | |
24 | 0A0/010 ALL sys_desc_table System description table (struct sys_desc_table), | |
25 | OBSOLETE!! | |
26 | 0B0/010 ALL olpc_ofw_header OLPC's OpenFirmware CIF and friends | |
27 | 0C0/004 ALL ext_ramdisk_image ramdisk_image high 32bits | |
28 | 0C4/004 ALL ext_ramdisk_size ramdisk_size high 32bits | |
29 | 0C8/004 ALL ext_cmd_line_ptr cmd_line_ptr high 32bits | |
30 | 140/080 ALL edid_info Video mode setup (struct edid_info) | |
31 | 1C0/020 ALL efi_info EFI 32 information (struct efi_info) | |
32 | 1E0/004 ALL alt_mem_k Alternative mem check, in KB | |
33 | 1E4/004 ALL scratch Scratch field for the kernel setup code | |
34 | 1E8/001 ALL e820_entries Number of entries in e820_table (below) | |
35 | 1E9/001 ALL eddbuf_entries Number of entries in eddbuf (below) | |
36 | 1EA/001 ALL edd_mbr_sig_buf_entries Number of entries in edd_mbr_sig_buffer | |
37 | (below) | |
38 | 1EB/001 ALL kbd_status Numlock is enabled | |
39 | 1EC/001 ALL secure_boot Secure boot is enabled in the firmware | |
40 | 1EF/001 ALL sentinel Used to detect broken bootloaders | |
41 | 290/040 ALL edd_mbr_sig_buffer EDD MBR signatures | |
42 | 2D0/A00 ALL e820_table E820 memory map table | |
43 | (array of struct e820_entry) | |
44 | D00/1EC ALL eddbuf EDD data (array of struct edd_info) | |
45 | =========== ===== ======================= ================================================= |