70 lines
2.4 KiB
Plaintext
70 lines
2.4 KiB
Plaintext
This directory contains an implementation of a block-device-partition server.
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Behavior
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--------
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The server uses Genode's block-session interfaces as both front and back end,
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leading to the most common use case where this server will reside "between" a
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block-driver server and a higher level component like a file-system server.
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At startup, the partition server will try to parse the master boot record (MBR)
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of its back-end block session. If no partition table is found, the whole block
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device is exported as partition '0'. In the other case, the MBR and possible
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extended boot records (EBRs) are parsed and offered as separate block sessions
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to the front-end clients. The four primary partitions will receive partition
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numbers '1' to '4' whereas the first logical partition will be assigned to '5'.
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The partition server also understands the GUID partition table (GPT). If the
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config attribute 'use_gpt' is set to 'yes' it will first try to parse any
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existing GPT. In case there is no GPT it will fall back to parsing the MBR.
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In order to route a client to the right partition, the server parses its
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configuration section looking for 'policy' tags.
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XML Syntax:
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! <policy labal="<program name>" parition="<partition number>" />
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Usage
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-----
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Configuration snippet with two clients and an (hypothetical) IDE driver:
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!<start name="ata_driver">
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! <resource name="RAM" quantum="1M" />
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! <provides><service name="Block"/></provides>
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! <config ata="yes" />
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!</start>
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!
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!<start name="part_blk">
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! <resource name="RAM" quantum="10M" />
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! <provides><service name="Block" /></provides>
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!
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! <!-- route part_blk to the ata_driver -->
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! <route>
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! <any-service><child name="ata_driver"/> <parent/><any-child/></any-service>
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! </route>
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!
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! <!-- allow program 'test-part1' to access logical partition '6', while program
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! 'test-part2' receives access to primary partition 1 -->
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! <config>
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! <policy label="test-part1" partition="6"/>
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! <policy label="test-part2" partition="1"/>
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! </config>
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!</start>
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!
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!<!-- part_blk clients -->
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!<start name="test-part1">
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! <binary name="test-part"/>
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! <resource name="RAM" quantum="10M" />
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! <route>
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! <any-service> <child name="part_blk" /> <parent/> <any-child/> </any-service>
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! </route>
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!</start>
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!
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!<start name="test-part2">
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! <binary name="test-part"/>
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! <resource name="RAM" quantum="10M" />
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! <route>
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! <any-service> <child name="part_blk" /> <parent/> <any-child/> </any-service>
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! </route>
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!</start>
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