BareMetal

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For other uses, see Bare metal (disambiguation).

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BareMetal is an exokernel-based single address space operating system (OS) created by Return Infinity.

It is written in assembly to achieve high-performance computing with minimal footprint[2][3] with a JeOS approach.[4] The operating system is primarily targeted towards virtualized environments for cloud computing, or HPCs due to its design as a lightweight kernel (LWK). It could be used as a unikernel.

It was inspired by another OS written in assembly, MikeOS,[1] and it is a current-day example of an operating system that is not written in C or C++, nor based on Unix-like kernels.[5]

Overview

Hardware requirements[6]

  • Intel/AMD-based 64-bit computer
  • Memory: 4 MB (plus 2 MB for every additional core)
  • Hard Disk: 32 MB

One task per core

Multitasking on BareMetal is unusual for operating systems in this day and age. BareMetal uses an internal work queue that all CPU cores poll. A task added to the work queue will be processed by any available CPU core in the system and will execute until completion, which results in no context switch overhead.[7]

Programming

API

An API is documented[8] but, in line with its philosophy, the OS does not enforce entry points for system calls (e.g.: no call gates or other safety mechanisms).

C

BareMetal OS has a build script to pull the latest code, make the needed changes, and then compile C code using[9] the Newlib C standard library.[10]

C++

A mostly-complete C++11 Standard Library was designed and developed for working in ring 0.[11] The main goal of such library is providing, on a library level, an alternative to hardware memory protection used in classical OSes, with help of carefully designed classes.[12]

Rust

A Rust program demonstration was added to the programs in November 2014, demonstrating the ability to write Rust programs for BareMetal OS.[13]

Networking

TCP/IP stack

A TCP/IP stack was the #1 feature request.[14] A port of lwIP written in C was announced in October 2014.[15]

References

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External links

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