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\chapter{Developers}

\label{developers}

\section{\JJ}

Jakub is the original author of the SPARTAN kernel and the initiator of

the idea to start the HelenOS project. Once the team was composed, he

implemented considerable parts of the ia64 code and he also worked on

the mips32 memory management. On the generic front, Jakub designed the

generic virtual address translation interface for the 4-level

hierarchical page table translation mechanism as well as the global page

hash table translation mechanism. He has been involved in the address

space management functions and userspace synchronization through

futexes. Other areas in which he contributed include the kernel console

and the kernel ELF loader. Jakub is also the author of the generic buddy

system framework as well as the B+tree implementation. His latest

contribution is the userspace PCI driver.

\section{\OP}

{\Ondrej} has completely created the amd64 port and completed the mips32 port

to the extent that it runs on a real MIPS machine\footnote{SGI Indy}.

Besides the architecture specific involvement, {\Ondrej} programmed the slab

allocator and modified the frame allocator to be self-contained which in

turn let the old and very limited heap manager be removed from the

kernel entirely. He also created architecture independent FPU lazy

switching framework. Other example of his activity is the IPC subsystem

and partial TLS\footnote{Thread local storage.} support. Lastly, {\Ondrej}

equipped the kernel console with features found in userspace command

shells (e.g. tab completion of commands and command history through

keyboard arrows) and wrote the kernel configuration software.

\section{\MD}

Right from the beginning, Martin has cared about project's code purity

and readibility. He was the first developer to start writing

Doxygen-style comments. He has promoted the proper use of C language

{\tt const} keywords and extensive typedefing. On the tools front, he

has rewritten the initial build system and created all our toolchain

build scripts.

Martin worked and much improved the ia32 and amd64 kernel booting using

the Grub bootloader and Multiboot specification. He also created

specialized boot loaders for mips32 and ppc32 --- architectures that

don't provide many other ways to load userspace init tasks. Finally,

Martin bacame the sole author of the entire ppc32 port and has

encountered partial success in booting ppc64 port to real

hardware\footnote{Apple G5.}.

\section{\JV}

Jakub has worked on ia32 and the ia64 FPU context switching and passive

ia32 and active and passive ia64 console. He has relocated the ia64

kernel to region 7 (i.e. to the highest addresses) and has first coped

with ia64 interrupts.  Lastly, Jakub programmed the VESA frame buffer

support for ia32 and amd64 and created the userspace framebuffer driver.

\section{\JC}

Josef has worked on ia32 memory map detection, softfloat and softint

libraries and printf() standards conformance. He also ported several

kernel libraries to userspace and implemented considerable parts of

HelenOS libc. Josef is the author of the userspace keyboard driver.

\section{\SB}

Sergey implemented sorting library functions and implemented the buddy

allocator interface for the frame allocator. He edited project

documentation.