Document xcrypt in the amd64 version of cpu.4.

Bits taken from the i386 version.

OK jmc@

diff --git a/share/man/man4/man4.amd64/cpu.4 b/share/man/man4/man4.amd64/cpu.4
index 3d7efea..e8d1e89 100644 (file)
--- a/share/man/man4/man4.amd64/cpu.4
+++ b/share/man/man4/man4.amd64/cpu.4
@@ -1,4 +1,4 @@
-.\"    $OpenBSD: cpu.4,v 1.7 2018/01/12 04:36:44 deraadt Exp $
+.\"    $OpenBSD: cpu.4,v 1.8 2018/07/15 18:04:37 fcambus Exp $
 .\"
 .\" Copyright (c) 2004 Ted Unangst
 .\" All rights reserved.
@@ -23,7 +23,7 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: January 12 2018 $
+.Dd $Mdocdate: July 15 2018 $
 .Dt CPU 4 amd64
 .Os
 .Sh NAME
@@ -52,6 +52,15 @@ offering frequency scaling with numerous positions.
 Found on various AMD processors.
 It currently only supports a limited set of models in the K8 families.
 .El
+.Sh INSTRUCTION SET EXTENSIONS
+The presence of extended instruction sets can be determined by the
+sysctl machdep.
+.Bl -tag -width "tenletters"
+.It xcrypt
+Supports the VIA AES encryption instruction set.
+If this is supported,
+the libcrypto EVP AES functions automatically use this support.
+.El
 .Sh THERMAL MONITORING
 The
 .Xr sysctl 2