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212 lines
6.3 KiB
Groff
212 lines
6.3 KiB
Groff
.\"
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.\" Copyright (c) 2011 Aleksandr Rybalko
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd May 17, 2011
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.Dt GEOM_MAP 4
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.Os
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.Sh NAME
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.Nm geom_map
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.Nd "GEOM module that maps defined items as separate partitions"
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.Sh SYNOPSIS
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To compile this driver into the kernel,
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place the following line in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device geom_map"
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.Ed
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.Sh DESCRIPTION
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The
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.Nm
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framework provides support for mapping defined parts of the media.
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Basically it is helpful for embedded devices where in the one continuous
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flash are loader, kernel and rootfs parts.
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.Nm
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allows making them available as separate parts and protects the loader from
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being overwritten.
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.Pp
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At boot time
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.Nm
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partitions are listed (only with bootverbose) as:
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.Bd -literal -offset indent
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MAP: 0x30000, data=0x30000 "/dev/map/bootloader"
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MAP: 30000x10000, data=0x10000 "/dev/map/factory"
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MAP: 40000x7a0000, data=0x7a0000 "/dev/map/upgrade"
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MAP: search key ".!/bin/sh" from 0x100000, step 0x10000
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MAP: 40000x110000, data=0x110000 "/dev/map/kernel"
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MAP: search key ".!/bin/sh" from 0x100000, step 0x10000
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MAP: 150000x690000, data=0x690000 "/dev/map/rootfs"
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MAP: 7e0000x20000, data=0x20000 "/dev/map/config"
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.Ed
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.Pp
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The current
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.Nm
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configuration can be accessed with the following
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.Xr sysctl 8
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nodes:
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.Va kern.geom.conftxt , kern.geom.confxml ,
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and
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.Va kern.geom.confdot
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or by using
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.Dq Li "geom map list" .
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.Bd -literal -offset indent
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# sysctl -n kern.geom.conftxt
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0 MD md0 10485760 512 u 0 s 512 f 0 fs 0 l 10485760 t malloc
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0 DISK cfid0 8388608 4 hd 0 sc 0
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1 MAP map/config 131072 4 i 5 o 8257536 entry 0 dsize 131072
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1 MAP map/rootfs 6881280 4 i 4 o 1376256 entry 0 dsize 6881280
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2 UNCOMPRESS map/rootfs.uncompress 18677760 512
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1 MAP map/kernel 1114112 4 i 3 o 262144 entry 0 dsize 1114112
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1 MAP map/upgrade 7995392 4 i 2 o 262144 entry 0 dsize 7995392
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1 MAP map/factory 65536 4 i 1 o 196608 entry 0 dsize 65536
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1 MAP map/bootloader 196608 4 i 0 o 0 entry 0 dsize 196608
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.Ed
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.Pp
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Driver configuration can be done in
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.Xr device.hints 5 .
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List of used parameters:
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.Bl -tag -width indent
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.It Va at
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select media to attach
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.It Va name
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name of partition (will create device
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.Pa /dev/map/ Ns Ar that_name )
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.It Va start
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offset from the beginning of the parent media to start of the mapped partition.
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This field can also have a special value
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.Qq Li search: Ns Ar searchstart Ns Li : Ns Ar searchstep Ns Li : Ns Ar searchkey ,
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where:
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.Bl -tag -width indent
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.It Ar searchstart
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offset from the beginning of the parent media where search will be started
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.It Ar searchstep
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value of the increment used while searching for the partition boundary markers
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.It Ar searchkey
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key which will be used to find partition boundary markers.
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The wildcard
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.Ql .\&
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can be used to match any character on that position
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.El
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.It Va end
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offset from the beginning of the parent media to the end of the mapped partition.
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This field can also have the special value
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.Qq Li search: Ns Ar searchstart Ns Li : Ns Ar searchstep Ns Li : Ns Ar searchkey ,
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as described above.
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.It Va offset
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offset where the data of the mapped partition begins
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.El
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.Pp
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Each record contains the start address (in bytes) from the media begin, size
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(in bytes), offset where the data of mapped partition begins, and the name of
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new device.
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.Bd -literal -offset indent
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MAP: 150000x690000, data=0x690000 "/dev/map/rootfs"
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.Ed
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.Bd -literal
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00150000 - start address
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00690000 - size
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00000000 - data begin from zero offset
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00690000 - data size
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"map/rootfs" - new media will be accessible via /dev/map/rootfs dev.
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.Ed
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.Sh EXAMPLES
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If we need to implement layout shown above, we need to define the following
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hints:
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.Bd -literal -offset indent
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hint.map.0.at="cfid0"
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hint.map.0.start=0x00000000
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hint.map.0.end=0x00030000
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hint.map.0.name="bootloader"
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hint.map.0.readonly=1
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.Ed
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.Pp
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This defines
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.Pa /dev/map/bootloader
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at disk
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.Pa cfid0
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starting at
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.Li 0x00000000
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and ending at
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.Li 0x00030000 ,
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it is also marked as readonly.
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.Bd -literal -offset indent
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hint.map.1.at="cfid0"
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hint.map.1.start=0x00030000
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hint.map.1.end=0x00040000
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hint.map.1.name="factory"
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hint.map.2.at="cfid0"
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hint.map.2.start=0x00040000
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hint.map.2.end=0x007e0000
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hint.map.2.name="upgrade"
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hint.map.3.at="cfid0"
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hint.map.3.name="kernel"
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hint.map.3.start=0x00040000
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hint.map.3.end="search:0x00100000:0x10000:.!/bin/sh"
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.Ed
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.Pp
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This defines
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.Pa /dev/map/kernel
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at disk
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.Pa cfid0
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starting at
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.Li 0x00040000 ,
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but the end position must be searched by finding the key
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.Dq Li ".!/bin/sh" ,
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from offset
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.Li 0x00100000
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to the end of media with step
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.Li 0x10000 .
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The real marker in this case is
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.Dq Li "#!/bin/sh" ,
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but
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.Ql #
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terminates the line when the hints file is parsed, so we need to use wildcard
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.Ql .\&
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instead of
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.Ql # .
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.Bd -literal -offset indent
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hint.map.4.at="cfid0"
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hint.map.4.name="rootfs"
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hint.map.4.start="search:0x00100000:0x10000:.!/bin/sh"
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hint.map.4.end=0x007e0000
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hint.map.5.at="cfid0"
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hint.map.5.start=0x007e0000
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hint.map.5.end=0x00800000
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hint.map.5.name="config"
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.Ed
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.Sh SEE ALSO
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.Xr geom 4 ,
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.Xr geom 8 ,
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.Xr sysctl 8
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.Sh AUTHORS
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The
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.Nm
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driver was written by
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.An "Aleksandr Rybalko" Aq ray@ddteam.net .
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