Kernelmodule system

[F42J]

No description provided.

[github-actions]

LCOV of commit 876aad7 during Osiris CI #319

Total coverage: 13.75%

lcov: WARNING: lcov: WARNING: RC option 'lcov_branch_coverage' is deprecated.  Consider using 'branch_coverage. instead.  (Backward-compatible support will be removed in the future
Summary coverage rate:
  lines......: 13.8% (232 of 1687 lines)
  functions..: 16.0% (39 of 244 functions)
  branches...: no data found

Files changed coverage rate: n/a

[Copilot]

Pull request overview

This PR introduces an in-tree kernel module system backed by build-time code generation, aiming to auto-discover kernel modules and generate a matching userspace-callable API for module calls.

Changes:

• Adds build-script discovery of #[kernelmod_init], #[kernelmod_exit], and #[kernelmod_call] functions and generates kernel dispatch + userspace wrappers.
• Introduces a PosixError errno enum and integrates it into the module-call return path.
• Extends proc-macros with a #[kernelmod_call] wrapper generator and updates syscall inline-asm stubs to return isize.

Reviewed changes

Copilot reviewed 10 out of 12 changed files in this pull request and generated 14 comments.

Show a summary per file

File	Description
build.rs	Adds kernel-module discovery and generates modules_kernel.rs/modules_uspace.rs.
macros/src/lib.rs	Adds #[kernelmod_call] proc-macro and wrapper generation logic.
src/modules.rs	Adds module system entrypoints and includes generated kernel module glue.
src/uspace.rs	Includes generated userspace module wrapper code.
src/error.rs	Adds PosixError errno definitions and conversions.
src/lib.rs	Exposes new modules and error modules from the crate root.
machine/arm/src/asm.rs	Updates syscall macro implementation to return a value via inline asm.
machine/testing/src/asm.rs	Updates syscall macro stubs to return isize for non-zero-arg forms.
src/modules/sample_module.rs	Adds a commented-out sample kernel module illustrating expected patterns.
.gitignore	Adds ignores for module-related generated files (paths currently appear mismatched).
src/utils.rs	Whitespace-only change.
src/uspace/.gitkeep	Adds placeholder to keep src/uspace/ directory in git.

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