Adeos -- an Adaptive Domain Environment for Operating Systems

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(Last updated: Feb. 20, 2001)

The Adaptive Domain Environment for Operating Systems (Adeos) provides an extensible and adaptive environment which can be used to enable the sharing of hardware resources among multiple operating systems or among multiple instances of the same operating system.

The implementation details of Adeos on the x86 using the Linux OS as the host are presented in a whitepaper entitled the Adeos Design Document which is available for download from the Adeos website. For each application field, a suggested deployment is presented.

Adeos is an open source project. Source code is being released under the GNU General Public License (GPL). The following are some excerpts from the Adeos Design Document whitepaper . . .

Adaptive Domain Environment for Operating Systems

As Adeos has to ensure equal and trusted access to the hardware it must take control of some hardware commands issued by the different OSes, but must not intrude too much on the different OSes' normal behavior. Each OS is encompassed in a domain over which it has total control. This domain may incude a private address space and software abstractions such as processes, virtual memory, files-systems, etc. These resources do not have to be exclusive since OSes that recognize Adeos and are able to interact with it may be able to share resources with or access the resources of other domains . . .

Adios architecture
Adeos uses an interrupt pipe to propogate interrupts through the different domains running on the hardware. As some domains may prefer to be the first to receive hardware interrupts, Adeos provides a mechanism for domains to have access to priority interrupt dispatching. In effect, Adeos places the requesting domain's interrupt handler and accompanying tables at the first stages of the interrupt pipeline. Accepting interrupts is the normal state of a domain's interrupt mechanism. When Adeos encounters a domain who is accepting interrupts it summons its interrupt handler after having set the required CPU environment and stack content for the interrupt hadnler to operate correctly. The OS then may decide to operate any number of operations including task scheduling. Once the OS is done, the pipeline proceeds as planned by propagating interrupts down the pipeline. As some OSes do not recognize Adeos, their idle task is modified to call on Adeos when it becomes scheduled. This is possible since the process tables of most operating systems are accessible from a device driver or module standpoint . . .

Adios' interrupt pipe
When an OS in a domain does not want to be interupted, for any type of reason, it asks Adeos to stall the stage its domain occupies in the interrupt pipeline. By doing so, interrupts go no further in the pipeline and are stalled at the stage occupied by the domain. When the OS is done wanting to be uninterrupted, it asks Adeos to unstall the pipeline and thereafter all the interrupts that were stalled at the corresponding stage follow their route to the other stages of the pipeline . . .

Once Adeos is done traversing the pipeline, it checks if all domains are dormant. If that is the case, it then calls on its idle task. This task remains active until the occurrence of the next interrupt . . .

Since Adeos is very much hardware dependent, many details pertain to one of its particular implementations . . .

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