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xous-core/kernel
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bunnie 09b2b29074 remember tid for swap-read; do PID dance for resume abstraction 
We want to use the finish_callback_and_resume() function because
it's well-tested and sets up everything just right, but it expects
that we're coming from another process. Unfortunately, in the
middle of all of this, we need to map a page back into the
destination process' memory space, so we end up starting from
the swapper's memory space, changing into the destination process'
memory space, then mapping the page, then changing back into
the swapper's memory space, then using the finish_callback_and_resume()
call.

I think the impact might not be *that* bad, mainly it's a TLB
miss and the PTW isn't super bad, and this comes after a disastrously
expensive decrypt-from-RAM operation -- so probably not worth it
to angonize over optimizing this bit at this point, and stick
with well-tested primitives.
2024-05-04 01:54:23 +08:00
..
bin add the .a artifacts to the tree for the asm.S 2024-01-06 16:41:40 +08:00
src remember tid for swap-read; do PID dance for resume abstraction 2024-05-04 01:54:23 +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 stage version pin bump 2024-04-01 15:46:26 +08:00
link.x add an "endcap" to the kernel region 2023-01-17 23:07:05 +08:00
README.md

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.