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2023-08-22std: xous: add os-specific ffi callsSean Cross-0/+176
Xous has no C FFI. Instead, all FFI is done via syscalls that are specified in Rust. Add these FFI calls to libstd, as well as some of the currently-supported syscalls. This enables Rust programs to interact with the Xous operating system while avoiding adding an extra dependency to libstd. Signed-off-by: Sean Cross <sean@xobs.io>