1*4882a593Smuzhiyun.. SPDX-License-Identifier: GPL-2.0 2*4882a593Smuzhiyun 3*4882a593Smuzhiyun========= 4*4882a593SmuzhiyunZero Page 5*4882a593Smuzhiyun========= 6*4882a593SmuzhiyunThe additional fields in struct boot_params as a part of 32-bit boot 7*4882a593Smuzhiyunprotocol of kernel. These should be filled by bootloader or 16-bit 8*4882a593Smuzhiyunreal-mode setup code of the kernel. References/settings to it mainly 9*4882a593Smuzhiyunare in:: 10*4882a593Smuzhiyun 11*4882a593Smuzhiyun arch/x86/include/uapi/asm/bootparam.h 12*4882a593Smuzhiyun 13*4882a593Smuzhiyun=========== ===== ======================= ================================================= 14*4882a593SmuzhiyunOffset/Size Proto Name Meaning 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun000/040 ALL screen_info Text mode or frame buffer information 17*4882a593Smuzhiyun (struct screen_info) 18*4882a593Smuzhiyun040/014 ALL apm_bios_info APM BIOS information (struct apm_bios_info) 19*4882a593Smuzhiyun058/008 ALL tboot_addr Physical address of tboot shared page 20*4882a593Smuzhiyun060/010 ALL ist_info Intel SpeedStep (IST) BIOS support information 21*4882a593Smuzhiyun (struct ist_info) 22*4882a593Smuzhiyun080/010 ALL hd0_info hd0 disk parameter, OBSOLETE!! 23*4882a593Smuzhiyun090/010 ALL hd1_info hd1 disk parameter, OBSOLETE!! 24*4882a593Smuzhiyun0A0/010 ALL sys_desc_table System description table (struct sys_desc_table), 25*4882a593Smuzhiyun OBSOLETE!! 26*4882a593Smuzhiyun0B0/010 ALL olpc_ofw_header OLPC's OpenFirmware CIF and friends 27*4882a593Smuzhiyun0C0/004 ALL ext_ramdisk_image ramdisk_image high 32bits 28*4882a593Smuzhiyun0C4/004 ALL ext_ramdisk_size ramdisk_size high 32bits 29*4882a593Smuzhiyun0C8/004 ALL ext_cmd_line_ptr cmd_line_ptr high 32bits 30*4882a593Smuzhiyun140/080 ALL edid_info Video mode setup (struct edid_info) 31*4882a593Smuzhiyun1C0/020 ALL efi_info EFI 32 information (struct efi_info) 32*4882a593Smuzhiyun1E0/004 ALL alt_mem_k Alternative mem check, in KB 33*4882a593Smuzhiyun1E4/004 ALL scratch Scratch field for the kernel setup code 34*4882a593Smuzhiyun1E8/001 ALL e820_entries Number of entries in e820_table (below) 35*4882a593Smuzhiyun1E9/001 ALL eddbuf_entries Number of entries in eddbuf (below) 36*4882a593Smuzhiyun1EA/001 ALL edd_mbr_sig_buf_entries Number of entries in edd_mbr_sig_buffer 37*4882a593Smuzhiyun (below) 38*4882a593Smuzhiyun1EB/001 ALL kbd_status Numlock is enabled 39*4882a593Smuzhiyun1EC/001 ALL secure_boot Secure boot is enabled in the firmware 40*4882a593Smuzhiyun1EF/001 ALL sentinel Used to detect broken bootloaders 41*4882a593Smuzhiyun290/040 ALL edd_mbr_sig_buffer EDD MBR signatures 42*4882a593Smuzhiyun2D0/A00 ALL e820_table E820 memory map table 43*4882a593Smuzhiyun (array of struct e820_entry) 44*4882a593SmuzhiyunD00/1EC ALL eddbuf EDD data (array of struct edd_info) 45*4882a593Smuzhiyun=========== ===== ======================= ================================================= 46