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xous-core/kernel
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Sean Cross 23e759ffd8 kernel: fix multi-page lending 
Due to several errors, multi-page lending did not work properly.

To begin with, if a page was not allocated then it would not be able to
be sent. That is, if you allocated 8192 bytes but only ever accessed the
first 4096 bytes, then an error would be encountered when lending the
unaccessed upper page.

Furthermore, due to a striding error in accessing pointers, half-pages
were treated as full pages.

Signed-off-by: Sean Cross <sean@xobs.io>
2021-05-05 10:58:12 +08:00
..
.cargo
.vscode kernel: fix server indexing 2020-08-29 22:10:24 +08:00
bin clean up some boot process holdovers 2021-04-30 23:28:31 +08:00
src kernel: fix multi-page lending 2021-05-05 10:58:12 +08:00
assemble.ps1
assemble.sh suspend/resume now works to hardware 2021-04-30 19:29:36 +08:00
build.rs adding license and copyright headers 2021-01-25 14:54:00 +01:00
Cargo.lock add susres server skeleton 2021-04-27 00:38:51 +08:00
Cargo.toml 0.8.0: tag release 2021-04-07 16:34:16 +08:00
link.x
README.md adding license info to README 2021-01-25 14:57:39 +01:00

README.md

Xous Kernel

This contains the core kernel for Xous. It requires a stage 1 loader in order to start up, as it assumes the system is already running in Supervisor mode.

Building

To build the kernel, you will need a riscv32 target for Rust. Possible targets include riscv32i-unknown-none-elf, riscv32imac-unknown-none-elf, or riscv32imac-unknown-xous-elf.

  1. Decide what target you want. For simple, embedded systems this could be riscv32i-unknown-none-elf, and for more complex systems with compressed instructions you could use riscv32imac-unknown-none-elf.
  2. Get Rust. Go to https://rustup.rs/ and follow its instructions.
  3. Install the proper toolchain: rustup target add ${target_arch}
  4. Build the kernel: cargo build --release --target ${target_arch}

Using

To use the kernel, you must package it up into an arguments binary with xous-tools.

Testing

TBD

Contribution Guidelines

Contributor Covenant

Please see CONTRIBUTING for details on how to make a contribution.

Please note that this project is released with a Contributor Code of Conduct. By participating in this project you agree to abide its terms.

License

Copyright © 2020

This project is licensed under the Apache License 2.0 LICENSE. For accurate information, please check individual files.