2.11BSD_X44 (TBA)

2.11BSD is unique in BSD's history, still receiving patches to it's codebase long after it's release. As well as being the only BSD to receive patches that were backported from numerous versions of 4BSD.

2.11BSD_X44 is 2.11BSD that continues with that tradition. Replacing the 4BSD (4.1BSD to 4.3BSD) styled vmspace and inodes with 4.4BSD's vmspace and vnodes. While retaining 2.11BSD's kernel and user space. 2.11BSD_X44 adopts the 4.4BSD & later BSD's (i.e. FreeBSD, NetBSD, OpenBSD & DragonflyBSD) approach of having a clearly defined architecture dependent code and architecture independent code, allowing for easier portability.

Source Roadmap:

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Directory	Description
bin	System/user commands.
contrib	Packages contributed by 3rd parties.
crypto	Cryptography stuff.
etc	Template files for /etc.
include	System include files.
lib	System libraries.
libexec	System daemons.
sbin	System commands.
share	Shared resources.
sys	Kernel sources.
sys/arch/arch/conf	Kernel configuration files. GENERIC.'arch' is the configuration used in release builds.
stand	Boot loader sources.
tools	Utilities for toolchain & cross-compiling.
usr.bin	User commands.
usr.lib	System User libraries for /lib.
usr.sbin	System administration commands.

Architecture Support:

• i386/x86 (In Development)
• AMD64 (In Development)
• Arm (32-Bit/64-Bit) (Planned)
• Riscv (32-Bit/64-Bit) (Planned)

Project Goals:

• Maintain a coding style in keeping with 2.11BSD's
• Innovate new ways to improve the OS while following the above point.
• Small Footprint: Ideally less than 200 system calls.
• Clean code

Project Aims:

• Improve 2.11BSD's Dual Control (Proc & User)
• Instruction & Data (I&D) Seperation (See VM)
• Pseudo Segmentation (See VM)
• Overlays (See OVL)
• Threading (Hybrid N/M):
  • Kernel Threads:
    • mcontext & ucontext
    • Bug Testing
  • User Threads/Fibres:
    • PThreads Support
    • IPC Improvements
• Scheduler:
  • Implement Preemptive capabilities
  • Bug Testing
• Networking:
  • Network: Complete
  • Firewall/ Packet Filter:
    • IPSEC: Complete
    • PF: Complete
    • IPSEC_FAST (aka netipsec folder): Complete
    • NPF: Ported (not working)
    • IPFILTER: Removed
• Filesystem Updates:
  • UFS/FFS/LFS:
    • LFS1/LFS2: (Work in Progress: See TODO.md for more)
      • LFS2: 64-bit support via UFS/FFS2
      • LFS1: 32-bit support via UFS/FFS1
    • UFS1/UFS2:
      • Journaling
      • Dirhash
• Filesystems:
  • Must Include:
    • NFS
    • SMB/CIFS
    • UDF
    • PUFFS or FUSE
  • Nice to Include:
    • EXT2/3/4
    • NTFS
    • HFS
    • HPFS
  • Heavily Considering:
    • UMAPFS
    • OVERLAY (NetBSD)

Development:

Started:

• Please read the TODO for an in-depth list.

OR

• Read the README.md in "devel" for in-development concepts planned

To Start:

• DEC VT220 style: amber coloured terminal font
• Package Manager: Port FreeBSD's
• BSD Installer: Port DragonflyBSD's

Porting:

2.11BSD_X44 is open to being ported to different architectures. Though due to limited access to hardware, testing of 2.11BSD_X44 on that architecture will be dependent on the individual/group (especially more exotic hardware).

Building:

You can cross-build 211BSD_X44 from most UNIX-like operating systems. To build for i386, in the src directory:

./build.sh -U -u -j4 -m i386 -O ~/obj release

NOTICE: The above build script will not produce a successful build. It is only recommended at this stage for testing the cross-compiler or adding new tools.

To build just the tools for i386, in the src directory:

./build.sh -U -u -j4 -m i386 -O ~/obj tools

To build the kernel for i386, in the src directory:

./build.sh -U -u -j4 -m i386 -O ~/obj -m i386 kernel="kernel config name here"

Recommended to copy GENERIC.i386 to your "kernel config name".

Please read the following NetBSD guide for more information:

https://www.netbsd.org/docs/guide/en/chap-build.html

Cross-Compiler Compatability Table:

Compiler	Toolchain	Arch's	Kernel	VM
GCC	Yes	i386	Yes **	Yes
CLANG	Partial ***	i386	No	No
PCC	No	i386	No	No

** GCC: No NPF

*** Clang: Library needs updating and fixing along with the relevent toolchain components.

Known OS's Supported:

• Ubuntu (20.04 to 23.04)
• Mint (21.1 & 21.2)

Contribution:

• Anyone is welcome to contribute.
• Your code should ideally fit the following guidelines & rules below
• Licensing:
  • The 3-Clause BSD license preferred.
  • Externally Maintained code for user libraries should be placed in one of the following:
    1. Any licensed code: contrib/"project name"
    2. OS Compatability code: contrib/oscompat/"os name"
• These rules in place to make it pleasant & easier for everyone.
  • It is highly recommended that you adhere to the following Contribution Guidelines & Rules.
  • Failing to follow the Contribution Guidelines & Rules will likely prevent your code from being accepted.

Contribution Guidelines

1. Clean Code.
2. Must Contain a License Header. Clearly stating year, author and the license.

Contribution Rules

1. Use of profanity.
   • Will not accept code that contains profanity.
2. No abuse of others
   • Constructive criticism is welcome