-Summary of boot_params layout (kernel point of view)
- ( collected by Hans Lermen and Martin Mares )
-
-The contents of boot_params are used to pass parameters from the
-16-bit realmode code of the kernel to the 32-bit part. References/settings
-to it mainly are in:
+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/i386/boot/setup.S
- arch/i386/boot/video.S
- arch/i386/kernel/head.S
- arch/i386/kernel/setup.c
-
+ include/asm-x86/bootparam.h
-Offset Type Description
------- ---- -----------
- 0 32 bytes struct screen_info, SCREEN_INFO
- ATTENTION, overlaps the following !!!
- 2 unsigned short EXT_MEM_K, extended memory size in Kb (from int 0x15)
- 0x20 unsigned short CL_MAGIC, commandline magic number (=0xA33F)
- 0x22 unsigned short CL_OFFSET, commandline offset
- Address of commandline is calculated:
- 0x90000 + contents of CL_OFFSET
- (only taken, when CL_MAGIC = 0xA33F)
- 0x40 20 bytes struct apm_bios_info, APM_BIOS_INFO
- 0x60 16 bytes Intel SpeedStep (IST) BIOS support information
- 0x80 16 bytes hd0-disk-parameter from intvector 0x41
- 0x90 16 bytes hd1-disk-parameter from intvector 0x46
- 0xa0 16 bytes System description table truncated to 16 bytes.
- ( struct sys_desc_table_struct )
- 0xb0 - 0x13f Free. Add more parameters here if you really need them.
- 0x140- 0x1be EDID_INFO Video mode setup
+Offset Proto Name Meaning
+/Size
-0x1c4 unsigned long EFI system table pointer
-0x1c8 unsigned long EFI memory descriptor size
-0x1cc unsigned long EFI memory descriptor version
-0x1d0 unsigned long EFI memory descriptor map pointer
-0x1d4 unsigned long EFI memory descriptor map size
-0x1e0 unsigned long ALT_MEM_K, alternative mem check, in Kb
-0x1e4 unsigned long Scratch field for the kernel setup code
-0x1e8 char number of entries in E820MAP (below)
-0x1e9 unsigned char number of entries in EDDBUF (below)
-0x1ea unsigned char number of entries in EDD_MBR_SIG_BUFFER (below)
-0x1f1 char size of setup.S, number of sectors
-0x1f2 unsigned short MOUNT_ROOT_RDONLY (if !=0)
-0x1f4 unsigned short size of compressed kernel-part in the
- (b)zImage-file (in 16 byte units, rounded up)
-0x1f6 unsigned short swap_dev (unused AFAIK)
-0x1f8 unsigned short RAMDISK_FLAGS
-0x1fa unsigned short VGA-Mode (old one)
-0x1fc unsigned short ORIG_ROOT_DEV (high=Major, low=minor)
-0x1ff char AUX_DEVICE_INFO
-
-0x200 short jump to start of setup code aka "reserved" field.
-0x202 4 bytes Signature for SETUP-header, ="HdrS"
-0x206 unsigned short Version number of header format
- Current version is 0x0201...
-0x208 8 bytes (used by setup.S for communication with boot loaders,
- look there)
-0x210 char LOADER_TYPE, = 0, old one
- else it is set by the loader:
- 0xTV: T=0 for LILO
- 1 for Loadlin
- 2 for bootsect-loader
- 3 for SYSLINUX
- 4 for ETHERBOOT
- 5 for ELILO
- 7 for GRuB
- 8 for U-BOOT
- 9 for Xen
- V = version
-0x211 char loadflags:
- bit0 = 1: kernel is loaded high (bzImage)
- bit7 = 1: Heap and pointer (see below) set by boot
- loader.
-0x212 unsigned short (setup.S)
-0x214 unsigned long KERNEL_START, where the loader started the kernel
-0x218 unsigned long INITRD_START, address of loaded ramdisk image
-0x21c unsigned long INITRD_SIZE, size in bytes of ramdisk image
-0x220 4 bytes (setup.S)
-0x224 unsigned short setup.S heap end pointer
-0x226 unsigned short zero_pad
-0x228 unsigned long cmd_line_ptr
-0x22c unsigned long ramdisk_max
-0x230 16 bytes trampoline
-0x290 - 0x2cf EDD_MBR_SIG_BUFFER (edd.S)
-0x2d0 - 0xd00 E820MAP
-0xd00 - 0xeff EDDBUF (edd.S) for disk signature read sector
-0xd00 - 0xeeb EDDBUF (edd.S) for edd data
+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)
+060/010 ALL ist_info Intel SpeedStep (IST) BIOS support information
+ (struct ist_info)
+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)
+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 alk_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_map (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)
+290/040 ALL edd_mbr_sig_buffer EDD MBR signatures
+2D0/A00 ALL e820_map E820 memory map table
+ (array of struct e820entry)
+D00/1EC ALL eddbuf EDD data (array of struct edd_info)
projects / cascardo / linux.git / blobdiff