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    Subject[PATCH] x86 boot: document for 32 bit boot protocol
    This patch documents the 32-bit boot protocol of x86. It has been used
    by Kexec and LinuxBIOS. This patch is based on the proposal of Peter

    Signed-off-by: Huang Ying <>


    boot.txt | 38 ++++++++++++++++
    zero-page.txt | 130 +++++++++++++---------------------------------------------
    2 files changed, 69 insertions(+), 99 deletions(-)

    Index: linux-2.6/Documentation/i386/boot.txt
    --- linux-2.6.orig/Documentation/i386/boot.txt 2007-10-24 09:21:57.000000000 +0800
    +++ linux-2.6/Documentation/i386/boot.txt 2007-10-24 09:31:52.000000000 +0800
    @@ -785,3 +785,41 @@
    After completing your hook, you should jump to the address
    that was in this field before your boot loader overwrote it
    (relocated, if appropriate.)
    +**** 32-bit BOOT PROTOCOL
    +For machine with some new BIOS other than legacy BIOS, such as EFI,
    +LinuxBIOS, etc, and kexec, the 16-bit real mode setup code in kernel
    +based on legacy BIOS can not be used, so a 32-bit boot protocol needs
    +to be defined.
    +In 32-bit boot protocol, the first step in loading a Linux kernel
    +should be to setup the boot parameters (struct boot_params,
    +traditionally known as "zero page"). The memory for struct boot_params
    +should be allocated and initialized to all zero. Then the setup header
    +from offset 0x01f1 of kernel image on should be loaded into struct
    +boot_params and examined. The end of setup header can be calculated as
    + 0x0202 + byte value at offset 0x0201
    +In addition to read/modify/write the setup header of the struct
    +boot_params as that of 16-bit boot protocol, the boot loader should
    +also fill the additional fields of the struct boot_params as that
    +described in zero-page.txt.
    +After setupping the struct boot_params, the boot loader can load the
    +32/64-bit kernel in the same way as that of 16-bit boot protocol.
    +In 32-bit boot protocol, the kernel is started by jumping to the
    +32-bit kernel entry point, which is the start address of loaded
    +32/64-bit kernel.
    +At entry, the CPU must be in 32-bit protected mode with paging
    +disabled; a GDT must be loaded with the descriptors for selectors
    +__BOOT_CS(0x10) and __BOOT_DS(0x18); both descriptors must be 4G flat
    +segment; __BOOS_CS must have execute/read permission, and __BOOT_DS
    +must have read/write permission; CS must be __BOOT_CS and DS, ES, SS
    +must be __BOOT_DS; interrupt must be disabled; %esi must hold the base
    +address of the struct boot_params; %ebp, %edi must be zero.
    Index: linux-2.6/Documentation/i386/zero-page.txt
    --- linux-2.6.orig/Documentation/i386/zero-page.txt 2007-10-24 09:21:57.000000000 +0800
    +++ linux-2.6/Documentation/i386/zero-page.txt 2007-10-24 09:31:52.000000000 +0800
    @@ -1,99 +1,31 @@
    -The zero page is a kernel internal data structure, not a stable ABI. It might change
    -without warning and the kernel has no way to detect old version of it.
    -If you're writing some external code like a boot loader you should only use
    -the stable versioned real mode boot protocol described in boot.txt. Otherwise the kernel
    -might break you at any time.
    -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
    -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
    +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:
    + include/asm-x86/bootparam.h
    +Offset 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)
    +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)
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