Handoff untypeds to a PD after initialisation#436
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Handoff untypeds to a PD after initialisation#436
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* Add boolean attribute to Protection Domain node in System Description File `receive_all_untypeds`, which selects which PD is to receive all remaining untyped objects after CapDL initialiser runs Signed-off-by: Szymon Duchniewicz <s.duchniewicz@unsw.edu.au>
Signed-off-by: Szymon Duchniewicz <s.duchniewicz@unsw.edu.au>
requires modified rust-sel4, szymon/handoff-untypeds branch
Signed-off-by: Szymon Duchniewicz <s.duchniewicz@unsw.edu.au>
Signed-off-by: Szymon Duchniewicz <s.duchniewicz@unsw.edu.au>
This was referenced Mar 12, 2026
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Depends on changes to rust-sel4: seL4/rust-sel4#322
This is still WIP, but opening for tracking and visibility.
Allows for specifying a Protection Domain (PD) and a Memory Region that will receive all untyped capabilities and information about them after the
capDL intiializerfinishes running (see: seL4/rust-sel4#322 for changes to thecapDL initializer). Also adds a simple example system using these changes.For the PD receiving the untypeds, its CNode gets restructured (similar to this proof-of-concept design), by creating a new root CNode, placing the Microkit CNode at idx 0 (so the cap pointers set up by the microkit system remain addresable the same way) and placing a new CNode at idx 1 (
receiving_untyped_cnode) which will receive all the untyped caps. Currently, to allow actually using these untypeds, also places a self referencing CNode cap at idx 0 ofreceiving_untyped_cnode.TODOs:
receiving_untyped_cnodeis necessary, should it instead hold a cap to the newrootCNode?receive_all_untypedsboolean in the capDL spec. Can't think of a better way for the CNode, but the Frame can maybe instead be a new FIllEntry? https://github.com/au-ts/rust-sel4/blob/3059c2d236bf56b066936dd48d8966255e172c3b/crates/sel4-capdl-initializer/src/initialize.rs#L570C17-L587C18