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- .. 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)
- =========== ===== ======================= =================================================
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