cvs commit: src/sys/sys gpt.h src/lib/libstand Makefile src/sbin/gpt Makefile add.c boot.c gpt.8 gpt.c gpt.h show.c src/sys/boot/common ufsread.c src/sys/boot/i386 Makefile src/sys/boot/i386/gptboot Makefile gptboot.c gptldr.S ...

John Baldwin jhb at
Wed Oct 24 14:33:00 PDT 2007

jhb         2007-10-24 21:33:00 UTC

  FreeBSD src repository

  Modified files:
    sys/sys              gpt.h 
    lib/libstand         Makefile 
    sbin/gpt             Makefile add.c gpt.8 gpt.c gpt.h show.c 
    sys/boot/common      ufsread.c 
    sys/boot/i386        Makefile 
    sys/boot/i386/gptboot Makefile gptboot.c 
    sys/boot/i386/libi386 biosdisk.c devicename.c 
    sys/geom/part        g_part.c g_part.h g_part_gpt.c 
  Added files:
    sbin/gpt             boot.c 
    sys/boot/i386/gptboot gptldr.S 
    sys/boot/i386/pmbr   Makefile pmbr.s 
  First cut at support for booting a GPT labeled disk via the BIOS bootstrap
  on i386 and amd64 machines.  The overall process is that /boot/pmbr lives
  in the PMBR (similar to /boot/mbr for MBR disks) and is responsible for
  locating and loading /boot/gptboot.  /boot/gptboot is similar to /boot/boot
  except that it groks GPT rather than MBR + bsdlabel.  Unlike /boot/boot,
  /boot/gptboot lives in its own dedicated GPT partition with a new
  "FreeBSD boot" type.  This partition does not have a fixed size in that
  /boot/pmbr will load the entire partition into the lower 640k.  However,
  it is limited in that it can only be 545k.  That's still a lot better than
  the current 7.5k limit for boot2 on MBR.  gptboot mostly acts just like
  boot2 in that it reads /boot.config and loads up /boot/loader.  Some more
  - Include uuid_equal() and uuid_is_nil() in libstand.
  - Add a new 'boot' command to gpt(8) which makes a GPT disk bootable using
    /boot/pmbr and /boot/gptboot.  Note that the disk must have some free
    space for the boot partition.
    - This required exposing the backend of the 'add' function as a
      gpt_add_part() function to the rest of gpt(8).  'boot' uses this to
      create a boot partition if needed.
  - Don't cripple cgbase() in the UFS boot code for /boot/gptboot so that
    it can handle a filesystem > 1.5 TB.
  - /boot/gptboot has a simple loader (gptldr) that doesn't do any I/O
    unlike boot1 since /boot/pmbr loads all of gptboot up front.  The
    C portion of gptboot (gptboot.c) has been repocopied from boot2.c.
    The primary changes are to parse the GPT to find a root filesystem
    and to use 64-bit disk addresses.  Currently gptboot assumes that the
    first UFS partition on the disk is the / filesystem, but this algorithm
    will likely be improved in the future.
  - Teach the biosdisk driver in /boot/loader to understand GPT tables.
    GPT partitions are identified as 'disk0pX:' (e.g. disk0p2:) which is
    similar to the /dev names the kernel uses (e.g. /dev/ad0p2).
  - Add a new "freebsd-boot" alias to g_part() for the new boot UUID.
  MFC after:      1 month
  Discussed with: marcel (some things might still change, but am committing
                          what I have so far)
  Revision  Changes    Path
  1.59      +4 -0      src/lib/libstand/Makefile
  1.8       +2 -2      src/sbin/gpt/Makefile
  1.16      +44 -32    src/sbin/gpt/add.c
  1.1       +266 -0    src/sbin/gpt/boot.c (new)
  1.18      +43 -2     src/sbin/gpt/gpt.8
  1.17      +1 -0      src/sbin/gpt/gpt.c
  1.12      +2 -0      src/sbin/gpt/gpt.h
  1.15      +3 -0      src/sbin/gpt/show.c
  1.15      +1 -1      src/sys/boot/common/ufsread.c
  1.22      +2 -2      src/sys/boot/i386/Makefile
  1.61      +25 -52    src/sys/boot/i386/gptboot/Makefile
  1.85      +117 -71   src/sys/boot/i386/gptboot/gptboot.c
  1.1       +123 -0    src/sys/boot/i386/gptboot/gptldr.S (new)
  1.52      +307 -35   src/sys/boot/i386/libi386/biosdisk.c
  1.9       +29 -12    src/sys/boot/i386/libi386/devicename.c
  1.1       +14 -0     src/sys/boot/i386/pmbr/Makefile (new)
  1.1       +221 -0    src/sys/boot/i386/pmbr/pmbr.s (new)
  1.11      +1 -0      src/sys/geom/part/g_part.c
  1.5       +1 -0      src/sys/geom/part/g_part.h
  1.5       +8 -0      src/sys/geom/part/g_part_gpt.c
  1.12      +3 -1      src/sys/sys/gpt.h

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