FreeBSD Kernel Source:
----------------------

This directory contains the source files and build glue that make up the FreeBSD
kernel and its modules, including both original and contributed software.

Source Roadmap:
---------------
| Directory | Description |
| --------- | ----------- |
| amd64 | AMD64 (64-bit x86) architecture support |
| arm | 32-bit ARM architecture support |
| arm64 | 64-bit ARM (AArch64) architecture support |
| cam | Common Access Method storage subsystem - `cam(4)` and `ctl(4)` |
| cddl | CDDL-licensed optional sources such as DTrace |
| conf | kernel build glue |
| compat | Linux compatibility layer, FreeBSD 32-bit compatibility |
| contrib | 3rd-party imported software such as OpenZFS |
| crypto | crypto drivers |
| ddb | interactive kernel debugger - `ddb(4)` |
| fs | most filesystems, excluding UFS, NFS, and ZFS |
| dev | device drivers |
| gdb | kernel remote GDB stub - `gdb(4)` |
| geom | GEOM framework - `geom(4)` |
| i386 | i386 (32-bit x86) architecture support |
| kern | main part of the kernel |
| libkern | libc-like and other support functions for kernel use |
| modules | kernel module infrastructure |
| net | core networking code |
| net80211 | wireless networking (IEEE 802.11) - `net80211(4)` |
| netgraph | graph-based networking subsystem - `netgraph(4)` |
| netinet | IPv4 protocol implementation - `inet(4)` |
| netinet6 | IPv6 protocol implementation - `inet6(4)` |
| netipsec | IPsec protocol implementation - `ipsec(4)` |
| netpfil | packet filters - `ipfw(4)`, `pf(4)`, and `ipfilter(4)` |
| opencrypto | OpenCrypto framework - `crypto(7)` |
| powerpc | PowerPC/POWER (32 and 64-bit) architecture support |
| riscv | 64-bit RISC-V architecture support |
| security | security facilities - `audit(4)` and `mac(4)` |
| sys | kernel headers |
| tests | kernel unit tests |
| ufs | Unix File System - `ffs(7)` |
| vm | virtual memory system |
| x86 | code shared by AMD64 and i386 architectures |