Overview

In order for the V-Class server to process separate threads, it must send process context messages from one thread in a process to another within the same or different process. The messages and data shared between threads are transferred between processors by way of common memory (shared memory).

Message transfers

For message transfers, the message resides in the source memory location before the transfer and in destination memory location after the transfer. Source and destination addresses are specified with either a virtual address or a physical address.

Data copy

For a data copy operation, the data resides in the memory of both the source and destination location. The size of the data copy operation can vary, with the source and destination address being specified within a single page or with a list of pages.

Data mover features

The following list highlights the data mover hardware functions:

Messaging and data copy can be to and from both interleaved and noninterleaved memory.
Each processor has an independent interface for copy transfers.
The initiating processor notifies the destination processor of impending messaging operations with queued completion status.
The initiating processor receives a confirmation interrupt at the completion of the transfer.
Copy operations can be from virtual-to-virtual, virtual-to-physical, physical-to-virtual, or physical-to-physical space.
Messages can be performed from virtual or physical space.
The source or destination space can be specified as a single page (where the page is up to four Mbytes in size), or with a Block Translation Table (BTT) with each entry mapping a four-Kbyte page.

Overview

Technical documentation

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Message transfers

Data copy

Data mover features