Red Bear OS — microkernel OS in Rust, based on Redox

Derivative of Redox OS (https://www.redox-os.org) adding:
- AMD GPU driver (amdgpu) via LinuxKPI compat layer
- ext4 filesystem support (ext4d scheme daemon)
- ACPI fixes for AMD bare metal (x2APIC, DMAR, IVRS, MCFG)
- Custom branding (hostname, os-release, boot identity)

Build system is full upstream Redox with RBOS overlay in local/.
Patches for kernel, base, and relibc are symlinked from local/patches/
and protected from make clean/distclean. Custom recipes live in
local/recipes/ with symlinks into the recipes/ search path.

Build:  make all CONFIG_NAME=redbear-full
Sync:   ./local/scripts/sync-upstream.sh

local/recipes/drivers/linux-kpi/source/src/lib.rs

@@ -0,0 +1,14 @@
+#![doc = "Linux Kernel API compatibility layer for Redox OS (LinuxKPI-style).\n\nProvides C headers and Rust FFI implementations that translate Linux kernel APIs\nto Redox OS primitives, enabling porting of Linux C drivers as Redox userspace daemons."]
+
+pub mod rust_impl;
+
+pub use rust_impl::device;
+pub use rust_impl::dma;
+pub use rust_impl::drm_shim;
+pub use rust_impl::firmware;
+pub use rust_impl::io;
+pub use rust_impl::irq;
+pub use rust_impl::memory;
+pub use rust_impl::pci;
+pub use rust_impl::sync;
+pub use rust_impl::workqueue;