---
name: "core"
section: "4"
platform: "openbsd"
package: "man"
version: "8.0-current-20261101"
release: "OpenBSD 8.0-current (2026-11-01)"
platforms: ["openbsd"]
url: "https://new.carta.tech/core/4"
---

# core(4)

processor core

## NAME

**core** – processor core

## SYNOPSIS

**core\* at cmp?**

## DESCRIPTION

The **core** driver provides support for the chip multi-threading processors that have multiple threads such as the Fujitsu SPARC64-VI processors. It is not a physical device as such, but an abstraction to attach individual CPU threads.

## SEE ALSO

[cmp(4)](/cmp/4.md), [intro(4)](/intro/4.md)

## HISTORY

The **core** driver first appeared in OpenBSD 4.4.

## AUTHORS

The **core** driver was written by Mark Kettenis ⟨*kettenis@openbsd.org*⟩.