bootparttest

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I’m following this thread with great interest, and I wanted to try bootparttest on one of my own computers.

Here is the result of running /usr/src/tools/tools/bootparttest on the drives /dev/ada0 and /dev/ada1:

GEOM provider "/dev/ada0" opened
Mediasize: 500107862016 Bytes (976773168 sectors)
Sectorsize: 512 Bytes
/dev/ada0: read 1 blocks from the offset 0 [+0]
/dev/ada0: read 1 blocks from the offset 1 [+0]
ptable_open: PMBR detected
/dev/ada0: read 1 blocks from the offset 1 [+0]
/dev/ada0: read 32 blocks from the offset 2 [+0]
/dev/ada0: read 1 blocks from the offset 976773167 [+0]
ptable_gptread: new GPT partition added
ptable_gptread: new GPT partition added
ptable_gptread: new GPT partition added
Partition table detected: GPT
  /dev/ada0p1: FreeBSD boot        128k
  /dev/ada0p2: FreeBSD swap        16G
  /dev/ada0p3: FreeBSD ZFS         449G

GEOM provider "/dev/ada1" opened
Mediasize: 500107862016 Bytes (976773168 sectors)
Sectorsize: 512 Bytes
/dev/ada1: read 1 blocks from the offset 0 [+0]
/dev/ada1: read 1 blocks from the offset 1 [+0]
ptable_open: PMBR detected
/dev/ada1: read 1 blocks from the offset 1 [+0]
/dev/ada1: read 32 blocks from the offset 2 [+0]
/dev/ada1: read 1 blocks from the offset 976773167 [+0]
ptable_gptread: new GPT partition added
ptable_gptread: new GPT partition added
ptable_gptread: new GPT partition added
Partition table detected: GPT
  /dev/ada1p1: FreeBSD boot        128k
  /dev/ada1p2: FreeBSD swap        16G
  /dev/ada1p3: FreeBSD ZFS         449G

Here is how you should build bootparttest:

root@enterprise:~>cd /usr/src/tools/tools/bootparttest
root@enterprise:/usr/src/tools/tools/bootparttest>mkdir -p /usr/obj`pwd`
root@enterprise:/usr/src/tools/tools/bootparttest>make
gcc -I/usr/src/tools/tools/bootparttest/../../../sys/boot/common -I.  -DLOADER_GPT_SUPPORT -DLOADER_MBR_SUPPORT -DPART_DEBUG -std=gnu99 -fstack-protector  -c /usr/src/tools/tools/bootparttest/bootparttest.c
ctfconvert -L VERSION bootparttest.o
gcc -I/usr/src/tools/tools/bootparttest/../../../sys/boot/common -I.  -DLOADER_GPT_SUPPORT -DLOADER_MBR_SUPPORT -DPART_DEBUG -std=gnu99 -fstack-protector  -c /usr/src/tools/tools/bootparttest/../../../sys/boot/common/crc32.c
ctfconvert -L VERSION crc32.o
gcc -I/usr/src/tools/tools/bootparttest/../../../sys/boot/common -I.  -DLOADER_GPT_SUPPORT -DLOADER_MBR_SUPPORT -DPART_DEBUG -std=gnu99 -fstack-protector  -c /usr/src/tools/tools/bootparttest/malloc.c
ctfconvert -L VERSION malloc.o
gcc -I/usr/src/tools/tools/bootparttest/../../../sys/boot/common -I.  -DLOADER_GPT_SUPPORT -DLOADER_MBR_SUPPORT -DPART_DEBUG -std=gnu99 -fstack-protector  -c /usr/src/tools/tools/bootparttest/../../../sys/boot/common/part.c
ctfconvert -L VERSION part.o
gcc -I/usr/src/tools/tools/bootparttest/../../../sys/boot/common -I.  -DLOADER_GPT_SUPPORT -DLOADER_MBR_SUPPORT -DPART_DEBUG -std=gnu99 -fstack-protector   -lgeom -lutil -o bootparttest bootparttest.o crc32.o malloc.o part.o /usr/lib/libgeom.a /usr/lib/libutil.a
ctfmerge -L VERSION -o bootparttest bootparttest.o crc32.o malloc.o part.o

The executable were placed in /usr/obj/usr/src/tools/tools/bootparttest:

root@enterprise:/usr/src/tools/tools/bootparttest>pushd /usr/obj`pwd`
/usr/obj/usr/src/tools/tools/bootparttest /usr/src/tools/tools/bootparttest
root@enterprise:/usr/obj/usr/src/tools/tools/bootparttest>./bootparttest /dev/ada0; echo; ./bootparttest /dev/ada1
GEOM provider "/dev/ada0" opened
Mediasize: 500107862016 Bytes (976773168 sectors)
Sectorsize: 512 Bytes
/dev/ada0: read 1 blocks from the offset 0 [+0]
/dev/ada0: read 1 blocks from the offset 1 [+0]
ptable_open: PMBR detected
/dev/ada0: read 1 blocks from the offset 1 [+0]
/dev/ada0: read 32 blocks from the offset 2 [+0]
/dev/ada0: read 1 blocks from the offset 976773167 [+0]
ptable_gptread: new GPT partition added
ptable_gptread: new GPT partition added
ptable_gptread: new GPT partition added
Partition table detected: GPT
  /dev/ada0p1: FreeBSD boot        128k
  /dev/ada0p2: FreeBSD swap        16G
  /dev/ada0p3: FreeBSD ZFS         449G

GEOM provider "/dev/ada1" opened
Mediasize: 500107862016 Bytes (976773168 sectors)
Sectorsize: 512 Bytes
/dev/ada1: read 1 blocks from the offset 0 [+0]
/dev/ada1: read 1 blocks from the offset 1 [+0]
ptable_open: PMBR detected
/dev/ada1: read 1 blocks from the offset 1 [+0]
/dev/ada1: read 32 blocks from the offset 2 [+0]
/dev/ada1: read 1 blocks from the offset 976773167 [+0]
ptable_gptread: new GPT partition added
ptable_gptread: new GPT partition added
ptable_gptread: new GPT partition added
Partition table detected: GPT
  /dev/ada1p1: FreeBSD boot        128k
  /dev/ada1p2: FreeBSD swap        16G
  /dev/ada1p3: FreeBSD ZFS         449G

Incidently, here’s a hex dump of the primary GPT header and the three entries currently in use on /dev/ada0:

00000200  45 46 49 20 50 41 52 54  00 00 01 00 5c 00 00 00  |EFI PART....\...|
00000210  8b 9a f3 5f 00 00 00 00  01 00 00 00 00 00 00 00  |..ó_............|
00000220  2f 60 38 3a 00 00 00 00  22 00 00 00 00 00 00 00  |/`8:....".......|
00000230  0e 60 38 3a 00 00 00 00  6e 5a 1f 2c f9 39 e1 11  |.`8:....nZ.,ù9á.|
00000240  96 51 50 e5 49 41 4d 70  02 00 00 00 00 00 00 00  |.QPåIAMp........|
00000250  80 00 00 00 80 00 00 00  b5 e0 32 3c 00 00 00 00  |........µà2<....|
00000260  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000400  9d 6b bd 83 41 7f dc 11  be 0b 00 15 60 b8 4f 0f  |.k½.A.Ü.¾...`¸O.|
00000410  3d 00 cc 3d f9 39 e1 11  96 51 50 e5 49 41 4d 70  |=.Ì=ù9á..QPåIAMp|
00000420  28 00 00 00 00 00 00 00  27 01 00 00 00 00 00 00  |(.......'.......|
00000430  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000480  b5 7c 6e 51 cf 6e d6 11  8f f8 00 02 2d 09 71 2b  |µ|nQÏnÖ..ø..-.q+|
00000490  2d d5 57 64 f9 39 e1 11  96 51 50 e5 49 41 4d 70  |-ÕWdù9á..QPåIAMp|
000004a0  00 08 00 00 00 00 00 00  ff 07 00 02 00 00 00 00  |........ÿ.......|
000004b0  00 00 00 00 00 00 00 00  73 00 77 00 61 00 70 00  |........s.w.a.p.|
000004c0  30 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |0...............|
000004d0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000500  ba 7c 6e 51 cf 6e d6 11  8f f8 00 02 2d 09 71 2b  |º|nQÏnÖ..ø..-.q+|
00000510  8f 9e da 76 f9 39 e1 11  96 51 50 e5 49 41 4d 70  |..Úvù9á..QPåIAMp|
00000520  00 08 00 02 00 00 00 00  07 60 38 3a 00 00 00 00  |.........`8:....|
00000530  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*

Here's my attempt at decoding the GPT header using http://en.wikipedia.org/wiki/GUID_Partition_Table as my guide:

GPT header of /dev/ada0
Header field Value
Signature 4546492050415254H = EFI PARTASCII
Revision 00010000H = 1.0
Header size 0000005CH = 92D
CRC32 of header 5FF39A8BH = 1609800331D
Current LBA 0000000000000001H = 1D
Backup LBA 000000003A38602FH = 976773167D
First usable LBA 0000000000000022H = 34D
Last usable LBA 000000003A38600EH = 976773134D
Disk GUID 2C1F5A6E39F911E1965150E549414D70H =
2C1F5A6E-39F9-11E1-9651-50E549414D70
Starting LBA of array of partition entries 0000000000000002H = 2D
Number of partitions entries 00000080H = 128D
Size of single partition entry 00000080H = 128D
CRC32 of partition array 3C32E0B5H = 1009967285D

I even attempted to decode the first three partition entries:

Partition entry describing /dev/ada0p1, a freebsd-boot partition
Entry field Value
Partition type GUID 83BD6B9D7F4111DCBE0B001560B84F0FH =
83BD6B9D-7F41-11DC-BE0B-001560B84F0F
Unique partition GUID 3DCC003D39F911E1965150E549414D70H =
3DCC003D-39F9-11E1-9651-50E549414D70
First LBA 0000000000000028H = 40D
Last LBA 0000000000000127H = 295D
Attribute flags 0000000000000000H = 0D
Partition name 0000 … 0000H = no name recorded
Partition entry describing /dev/ada0p2, a freebsd-swap partition
Entry field Value
Partition type GUID 516E7CB56ECF11D68FF800022D09712BH =
516E7CB5-6ECF-11D6-8FF8-00022D09712B
Unique partition GUID 6457D52D39F911E1965159E549414D70H =
6457D52D-39F9-11E1-9651-59E549414D70
First LBA 0000000000000800H = 2048D
Last LBA 00000000020007FFH = 33556479D
Attribute flags 0000000000000000H = 0D
Partition name 007300770061007000300000 … 0000H = swap0UTF-16LE
Partition entry describing /dev/ada0p3, a freebsd-zfs partition
Entry field Value
Partition type GUID 516E7CBA6ECF11D68FF800022D09712BH =
516E7CBA-6ECF-11D6-8FF8-00022D09712B
Unique partition GUID 76DA9E8F39F911E1965150E549414D70H =
76DA9E8F-39F9-11E1-9651-50E549414D70
First LBA 0000000002000800H = 33556480D
Last LBA 000000003A386007H = 976773127D
Attribute flags 0000000000000000H = 0D
Partition name 0000 … 0000H = no name recorded

Microsoft's GUIDs are strange beasts with mixed endianness. My God, who other than Microsoft would devise such wierdness? It's utterly counterintuitive.