saymrwulf/xous-core
1
0
Fork 0
mirror of https://github.com/saymrwulf/xous-core.git synced 2026-11-04 04:27:34 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions
xous-core/kernel
History
bunnie 8d318d3ed9 add epoch rollover core handler 
This is put in the `mem.rs` file because it has to have access
to its private allocation table.

The renorm strategy used does an in-place reduction of epoch
values down to the minimum set that can uniquely represent every
value within the array. The approach only uses stack allocated
temporary storage, and the amount of stack required is chosen
to fit within the one-page goal of the kernel's overhead.

This does mean that the algorithm doesn't run as fast as
it possibly could, in fact, it has to do multiple passes
on the allocation table due to the limited storage for normalized
values.

However, the allocation table itself is probably going to be
limited to hundreds to low-thousands of values, and the renorm
routine happens once in a blue moon, so I think this is
acceptable, and preferable to the YOLO punt of setting all
epoch stamps to 0 and re-discovering the LRU ordering, or
allocating a temporary storage structure equivalent to that
of the allocation table to make the thing run optimally fast.
2024-05-18 00:24:52 +08:00
..
bin add the .a artifacts to the tree for the asm.S 2024-01-06 16:41:40 +08:00
src add epoch rollover core handler 2024-05-18 00:24:52 +08:00
assemble.ps1 kernel: asm: align kernel stack to 16 bytes 2023-12-29 18:15:48 +08:00
assemble.sh kernel: asm: align kernel stack to 16 bytes 2023-12-29 18:15:48 +08:00
build.rs ok, format the kernel now that all in-line assembly has been checked 2024-01-14 19:27:14 +08:00
Cargo.toml add test and debug deps/features 2024-05-18 00:22:23 +08:00
link.x add an "endcap" to the kernel region 2023-01-17 23:07:05 +08:00
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.