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\chapter{Developers}

\label{developers}

\section{\JJ}

{\JJ} is the original author of the SPARTAN kernel and the initiator of the

idea to start the HelenOS project. During the works on the system, he has

been the most active developer. He also took on the project agenda

and administration and became the project leader.

Before the project officially started, {\JJ} created the SPARTAN kernel

for ia32 and mips32 along with SMP support, scheduler and synchronization\footnote{The

initial SPARTAN kernel did not reach userspace.}.

In the project time proper, he implemented considerable parts

of ia64 code and worked also on mips32 memory management.

On the generic front, {\JJ} designed generic the virtual address

translation interface for the 4-level hierarchical page table translation mechanism

as well as for the global page hash table translation mechanism. He has been involved

in address space management functions and userspace synchronization through futexes.

Other areas of his contribution include the kernel console and the kernel ELF loader.

{\JJ} is also the author of the generic buddy system framework and B+tree implementation.

\section{\OP}

{\OP} has been very agile HelenOS developer. He is responsible for large areas of the

kernel and userspace and 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, {\OP} 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, {\OP} 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.

Apart from the self development, other members of the team appreciated \OP's excellent

debugging and troubleshooting skills. He has been the person behind discovery of

majority of the compiler and simulator bugs.

\section{\MD}

{\MD} is a very dedicated HelenOS developer. 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,

{\MD} 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}

{\JV} has worked on ia32 and 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. {\JV} has been always prepared to discuss different kernel

issues. His expertise in ia32 is well recognized.

\section{\JC}

{\JC} has worked on ia32 memory map detection, softfloat and softint libraries

and printf() standards comformance. He also ported several kernel libraries to userspace.

\section{\SB}

{\SB} implemented sorting library functions and implemented the buddy allocator

interface for the frame allocator. He edited project documentation.