[src/trunk]: src/share/man/man9 Document __HAVE_UCAS_FULL and __HAVE_UCAS_MP.

[thorpej <thorpej%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/a639ee2c947f
branches:  trunk
changeset: 373850:a639ee2c947f
user:      thorpej <thorpej%NetBSD.org@localhost>
date:      Mon Mar 06 12:25:06 2023 +0000

description:
Document __HAVE_UCAS_FULL and __HAVE_UCAS_MP.

diffstat:

 share/man/man9/portfeatures.9 |  16 +++++++++++++++-
 1 files changed, 15 insertions(+), 1 deletions(-)

diffs (28 lines):

diff -r 20a92576dddd -r a639ee2c947f share/man/man9/portfeatures.9
--- a/share/man/man9/portfeatures.9     Mon Mar 06 05:54:54 2023 +0000
+++ b/share/man/man9/portfeatures.9     Mon Mar 06 12:25:06 2023 +0000
@@ -1,4 +1,4 @@
-.\"    $NetBSD: portfeatures.9,v 1.2 2023/03/06 01:03:45 wiz Exp $
+.\"    $NetBSD: portfeatures.9,v 1.3 2023/03/06 12:25:06 thorpej Exp $
 .\"
 .\" Copyright (c) The NetBSD Foundation, Inc.
 .\" All rights reserved.
@@ -75,4 +75,18 @@
 .\" ---------
 .It Dv __HAVE_SPIN_MUTEX_STUBS Pq Xr mutex 9
 The port provides fast path enter and exit stubs for spin mutexes.
+.
+.\" ---------
+.It Dv __HAVE_UCAS_FULL Pq Xr ucas 9
+The port provides a full implementation of the low-level primitives
+required for atomic compare-and-swap operations to user-space addresses.
+.
+.\" ---------
+.It Dv __HAVE_UCAS_MP Pq Xr ucas 9
+The port does not provide a full implementation of the low-level
+primitives required for atomic compare-and-swap operations to user-space
+addresses, but does provide an implementation of those primitives that
+can be used if
+.Pq and only if
+the system has more than one processor.
 .El