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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. |