L4 Realtime Operating Systems
L4 Realtime Operating Systems
L4
L4: a growing family of 2nd-generation microkernel realtime operating systems (RTOSs) that are fast, small, lean, maintainable, readable, preemptible, support hard priorities, use non-blocking synchronization for kernel objects to guarantee priority inheritance and ensure runnable high-priority processes never block waiting for lower ones. All scale well from tiny embedded systems to huge servers, and use hierarchical external pagers and guarded page tables, with fast, message-based, synchronous IPC, simply-used external paging mechanisms, security mechanism based on secure domains: tasks, clans, chiefs. Kernels try to implement only a minimal set of abstractions on which OSs can be built flexibly. L3 has system-wide persistence. All kernels are roughly compatible and many run on many platforms: ARM; MIPS; 68k, PPC; x86; L4Linux ports exist. Goals: create, prove, establish new methodology for systems that helps manage growing OS complexity and minimizes legacy dependence. [Open Source, GPL]
Top: Computers: Software: Operating Systems: Realtime: L4
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 - Lean, with fast, message-based, synchronous IPC, simply-used external paging mechanisms, security mechanism based on secure domains: tasks, clans, chiefs. Kernels try to implement only a minimal set of abstractions on which OSs can be built flexibly. L3 h
- Preemptible, realtime, 2nd-generation microkernel, fast, maintainable, readable, supports hard priorities, uses non-blocking synchronization for kernel objects to guarantee priority inheritance, ensure runnable high-priority processes never block waiting
- A secure platform for applications that use digital signatures. Based on L4 and Linux. Research project at Applied Data Security Group, Ruhr-University Bochum., Germany.
- L4-based microkernel systems, for embedded systems to huge servers. L4: a tiny, fast, second generation microkernel using hierarchical external pagers and guarded page tables. Goals: create, prove, establish new methodology for systems that helps manage g
- L4 and Linux based research project aiming at the support of applications with Quality of Service requirements. At TU Dresden.
- L4/MIPS: stable L4 for MIPS R4x00 processor, may be fastest kernel for this architecture. L4/Alpha: begun at Technical University of Dresden, SMP version released. Linux ports: L4/MIPS, L4/Alpha underway.
- Goal: address the complexity of building and maintaining a variety of custom OSs. As embedded and personal systems grow more common, the need to make OSs customized to many device and application needs rises. At IBM T.J. Watson Research Center.
- Orthogonally persistent, capability-based secure SASOS using L4 2nd generation microkernel. Goals: Prove SASOSs can run on normal hardware, be as secure as normal OSs; can be as efficient as, and are faster than, normal OSs in some important uses; can be
- The L4Ka microkernel is an L4 compatible kernel running on many platforms: ARM; MIPS; 68k, PPC; x86. A port of Linux atop an L4Ka microkernel exists.
- A distributed operating system based on the concepts of object replication, component model support and persistence. It consists of a L4 microkernel and a set of distributed objects acting at the user level. [Open source]
- Porting the Hurd to the L4 microkernel. News, plans, pointers to mailing lists and websites.
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