Writing Systems Software in a Functional Language

Current practices for developing systems software usually rely on fairly low-level programming languages and tools. As an alternative, our group has been investigating the pos- sibility of using a high-level functional language, Haskell, for kernel and device driver construction, with the hope that it will allow us to produce more reliable and secure software. In this paper, we describe our experience developing a pro- totype operating system, House, in which the kernel, device drivers, and even a simple GUI, are all written in Haskell. The House system demonstrates that it is indeed possible to construct systems software in a functional language. How- ever, it also suggests some ideas for a new Haskell dialect with features that target specic needs in this domain, in- cluding strongly typed support for low-level data structures and facilities for explicit memory accounting.