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XtratuM is a bare-metal hypervisor specially designed for embedded real-time systems available for the instruction sets x86, LEON2 and LEON3 (SPARC v8), ARM Cortex-R4F processors. It has been developed by the Universidad Politécnica de Valencia (Spain) with contributions of the Lanzhou University (China). XtratuM is released as free and open-source software, subject to the requirements of the GNU General Public License (GPL), version 2 or any later. XtratuM is a hypervisor designed for embedded systems to meet safety critical real-time requirements. It provides a framework to run several operating systems (or real-time executives) in a robust partitioned environment. XtratuM can be used to build a MILS (Multiple Independent Levels of Security) architecture. == History == The name XtratuM derives from the word stratum. In geology and related fields it means: Layer of rock or soil with internally consistent characteristics that distinguishes it from contiguous layers. In order to stress the tight relation with Linux and the open-source movements, the “S” was replaced by “X”. XtratuM would be the first layer of software (the one closest to the hardware), which provides a solid basis for the rest of the system. XtratuM 1.0 was initially designed as a substitution of the RTLinux HAL (Hardware Abstraction Layer) to meet temporal and spatial partitioning requirements. The goal was to virtualize the essential hardware devices to execute several OSes concurrently, with at least one of these OSes being a RTOS. The other hardware devices (including booting) were left to a special domain, named root domain. After this experience, it was redesigned to be independent of Linux and bootable. The result of this is XtratuM 2.0 which is type 1 hypervisor that uses para-virtualization. The para-virtualized operations are as close to the hardware as possible. Therefore, porting an operating system that already works on the native system is a simple task: replace some parts of the operating system HAL with the corresponding hypercalls. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「XtratuM」の詳細全文を読む スポンサード リンク
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