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Diffstat (limited to 'Documentation/i386/zero-page.txt')
| -rw-r--r-- | Documentation/i386/zero-page.txt | 84 |
1 files changed, 0 insertions, 84 deletions
diff --git a/Documentation/i386/zero-page.txt b/Documentation/i386/zero-page.txt deleted file mode 100644 index df28c741678..00000000000 --- a/Documentation/i386/zero-page.txt +++ /dev/null @@ -1,84 +0,0 @@ -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: - - arch/i386/boot/setup.S - arch/i386/boot/video.S - arch/i386/kernel/head.S - arch/i386/kernel/setup.c - - -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 - -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 -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 - 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 |