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