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\chapter{Developers}
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\label{developers}
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\section{\JJ}
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Jakub is the original author of the SPARTAN kernel and the initiator of
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the idea to start the HelenOS project. Once the team was composed, he
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implemented considerable parts of the ia64 code and he also worked on
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the mips32 memory management. On the generic front, Jakub designed the
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generic virtual address translation interface for the 4-level
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hierarchical page table translation mechanism as well as the global page
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hash table translation mechanism. He has been involved in the address
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space management functions and userspace synchronization through
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futexes. Other areas in which he contributed include the kernel console
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and the kernel ELF loader. Jakub is also the author of the generic buddy
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system framework as well as the B+tree implementation. His latest
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contribution is the userspace PCI driver.
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\section{\OP}
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{\Ondrej} has completely created the amd64 port and completed the mips32 port
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to the extent that it runs on a real MIPS machine\footnote{SGI Indy}.
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Besides the architecture specific involvement, {\Ondrej} programmed the slab
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allocator and modified the frame allocator to be self-contained which in
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turn let the old and very limited heap manager be removed from the
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kernel entirely. He also created architecture independent FPU lazy
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switching framework. Other example of his activity is the IPC subsystem
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and partial TLS\footnote{Thread local storage.} support. Lastly, {\Ondrej}
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equipped the kernel console with features found in userspace command
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shells (e.g. tab completion of commands and command history through
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keyboard arrows) and wrote the kernel configuration software.
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\section{\MD}
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Right from the beginning, Martin has cared about project's code purity
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and readibility. He was the first developer to start writing
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Doxygen-style comments. He has promoted the proper use of C language
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{\tt const} keywords and extensive typedefing. On the tools front, he
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has rewritten the initial build system and created all our toolchain
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build scripts.
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Martin worked and much improved the ia32 and amd64 kernel booting using
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the Grub bootloader and Multiboot specification. He also created
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specialized boot loaders for mips32 and ppc32 --- architectures that
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don't provide many other ways to load userspace init tasks. Finally,
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Martin bacame the sole author of the entire ppc32 port and has
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encountered partial success in booting ppc64 port to real
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hardware\footnote{Apple G5.}.
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\section{\JV}
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Jakub has worked on ia32 and the ia64 FPU context switching and passive
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ia32 and active and passive ia64 console. He has relocated the ia64
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kernel to region 7 (i.e. to the highest addresses) and has first coped
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with ia64 interrupts.  Lastly, Jakub programmed the VESA frame buffer
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support for ia32 and amd64 and created the userspace framebuffer driver.
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\section{\JC}
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Josef has worked on ia32 memory map detection, softfloat and softint
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libraries and printf() standards conformance. He also ported several
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kernel libraries to userspace and implemented considerable parts of
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HelenOS libc. Josef is the author of the userspace keyboard driver.
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\section{\SB}
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Sergey implemented sorting library functions and implemented the buddy
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allocator interface for the frame allocator. He edited project
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documentation.