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aarch64-paging's Introduction

aarch64 page table manipulation

crates.io page docs.rs page

This crate provides a library to manipulate EL1 page tables conforming to the AArch64 Virtual Memory System Architecture.

This is not an officially supported Google product.

License

Licensed under either of

at your option.

Contributing

If you want to contribute to the project, see details of how we accept contributions.

aarch64-paging's People

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alanstokes avatar ardbiesheuvel avatar davidbrazdil avatar dependabot[bot] avatar jakobvukalovic avatar qwandor avatar

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aarch64-paging's Issues

Consider making `map_range` return an error for unsafe changes

In particular, any change which requires break-before-make shouldn't be made while the page table is active. This could check the state of previous_ttbr to determine whether it is active, pass it down into the walker code, and then return an error if some part of the change is invalid in that case.

The problem is that part of the range being mapped might be fine and part might not be, so it might end up creating a partial mapping before realising that it should return an error. Rolling this back isn't safe either. We could do a first walk to check whether it is valid then a second to actually make the change, I guess, but that would introduce a runtime overhead in the normal case.

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