1 Summary of boot_params layout (kernel point of view)
2 ( collected by Hans Lermen and Martin Mares )
3
4 The contents of boot_params are used to pass parameters from the
5 16-bit realmode code of the kernel to the 32-bit part. References/settings
6 to it mainly are in:
7
8 arch/i386/boot/setup.S
9 arch/i386/boot/video.S
10 arch/i386/kernel/head.S
11 arch/i386/kernel/setup.c
12
13
14 Offset Type Description
15 ------ ---- -----------
16 0 32 bytes struct screen_info, SCREEN_INFO
17 ATTENTION, overlaps the following !!!
18 2 unsigned short EXT_MEM_K, extended memory size in Kb (from int 0x15)
19 0x20 unsigned short CL_MAGIC, commandline magic number (=0xA33F)
20 0x22 unsigned short CL_OFFSET, commandline offset
21 Address of commandline is calculated:
22 0x90000 + contents of CL_OFFSET
23 (only taken, when CL_MAGIC = 0xA33F)
24 0x40 20 bytes struct apm_bios_info, APM_BIOS_INFO
25 0x60 16 bytes Intel SpeedStep (IST) BIOS support information
26 0x80 16 bytes hd0-disk-parameter from intvector 0x41
27 0x90 16 bytes hd1-disk-parameter from intvector 0x46
28
29 0xa0 16 bytes System description table truncated to 16 bytes.
30 ( struct sys_desc_table_struct )
31 0xb0 - 0x13f Free. Add more parameters here if you really need them.
32 0x140- 0x1be EDID_INFO Video mode setup
33
34 0x1c4 unsigned long EFI system table pointer
35 0x1c8 unsigned long EFI memory descriptor size
36 0x1cc unsigned long EFI memory descriptor version
37 0x1d0 unsigned long EFI memory descriptor map pointer
38 0x1d4 unsigned long EFI memory descriptor map size
39 0x1e0 unsigned long ALT_MEM_K, alternative mem check, in Kb
40 0x1e8 char number of entries in E820MAP (below)
41 0x1e9 unsigned char number of entries in EDDBUF (below)
42 0x1ea unsigned char number of entries in EDD_MBR_SIG_BUFFER (below)
43 0x1f1 char size of setup.S, number of sectors
44 0x1f2 unsigned short MOUNT_ROOT_RDONLY (if !=0)
45 0x1f4 unsigned short size of compressed kernel-part in the
46 (b)zImage-file (in 16 byte units, rounded up)
47 0x1f6 unsigned short swap_dev (unused AFAIK)
48 0x1f8 unsigned short RAMDISK_FLAGS
49 0x1fa unsigned short VGA-Mode (old one)
50 0x1fc unsigned short ORIG_ROOT_DEV (high=Major, low=minor)
51 0x1ff char AUX_DEVICE_INFO
52
53 0x200 short jump to start of setup code aka "reserved" field.
54 0x202 4 bytes Signature for SETUP-header, ="HdrS"
55 0x206 unsigned short Version number of header format
56 Current version is 0x0201...
57 0x208 8 bytes (used by setup.S for communication with boot loaders,
58 look there)
59 0x210 char LOADER_TYPE, = 0, old one
60 else it is set by the loader:
61 0xTV: T=0 for LILO
62 1 for Loadlin
63 2 for bootsect-loader
64 3 for SYSLINUX
65 4 for ETHERBOOT
66 V = version
67 0x211 char loadflags:
68 bit0 = 1: kernel is loaded high (bzImage)
69 bit7 = 1: Heap and pointer (see below) set by boot
70 loader.
71 0x212 unsigned short (setup.S)
72 0x214 unsigned long KERNEL_START, where the loader started the kernel
73 0x218 unsigned long INITRD_START, address of loaded ramdisk image
74 0x21c unsigned long INITRD_SIZE, size in bytes of ramdisk image
75 0x220 4 bytes (setup.S)
76 0x224 unsigned short setup.S heap end pointer
77 0x226 unsigned short zero_pad
78 0x228 unsigned long cmd_line_ptr
79 0x22c unsigned long ramdisk_max
80 0x230 16 bytes trampoline
81 0x290 - 0x2cf EDD_MBR_SIG_BUFFER (edd.S)
82 0x2d0 - 0xd00 E820MAP
83 0xd00 - 0xeff EDDBUF (edd.S) for disk signature read sector
84 0xd00 - 0xeeb EDDBUF (edd.S) for edd data
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