portfeatures.9 revision 1.1
$NetBSD: portfeatures.9,v 1.1 2023/03/06 00:49:31 uwe Exp $
Copyright (c) The NetBSD Foundation, Inc.
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2. Redistributions in binary form must reproduce the above copyright
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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.Dd March 6, 2023 .Dt PORTFEATURES 9 .Os . .Sh NAME .Nm portfeatures .Nd the __HAVEs (\|and the have nots\|) . .Sh DESCRIPTION Machine-independent kernel code adapts to differeces in hardware capabilities provided by the machine-dependent parts of the kernel. A port declares its capabilities by definining various .Li __HAVE_ Ns Ar feature macros. This manual page provides an index of such macros with pointers to other manual pages in the kernel section that provide all the relevant details. l -tag -width Dv . ---------
t Dv __HAVE_MUTEX_STUBS Pq Xr mutex 9 The port provides fast path mutex enter and exit stubs. . ---------
t Dv __HAVE_PREEMPTION Pq Xr cpu_need_resched 9 The port can preempt kernel lwps with .Dv RESCHED_KPREEMPT . . ---------
t Dv __HAVE_PTRACE_MACHDEP The port has MD .Xr ptrace 2 requests, defines .Dv PTRACE_MACHDEP_REQUEST_CASES macro with c case labels for its MD requests. . ---------
t Dv __HAVE_RAS Pq Xr ras 9 The port supports restartable atomic sequences. . ---------
t Dv __HAVE_SIMPLE_MUTEXES Pq Xr mutex 9 The port provides a CAS function that is either MP-safe, or does not need to be MP safe. Adaptive mutexes on these architectures do not require an additional interlock. . ---------
t Dv __HAVE_SPIN_MUTEX_STUBS Pq Xr mutex 9 The port provides fast path enter and exit stubs for spin mutexes. .El
Copyright (c) The NetBSD Foundation, Inc.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (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 March 6, 2023 .Dt PORTFEATURES 9 .Os . .Sh NAME .Nm portfeatures .Nd the __HAVEs (\|and the have nots\|) . .Sh DESCRIPTION Machine-independent kernel code adapts to differeces in hardware capabilities provided by the machine-dependent parts of the kernel. A port declares its capabilities by definining various .Li __HAVE_ Ns Ar feature macros. This manual page provides an index of such macros with pointers to other manual pages in the kernel section that provide all the relevant details. l -tag -width Dv . ---------
t Dv __HAVE_MUTEX_STUBS Pq Xr mutex 9 The port provides fast path mutex enter and exit stubs. . ---------
t Dv __HAVE_PREEMPTION Pq Xr cpu_need_resched 9 The port can preempt kernel lwps with .Dv RESCHED_KPREEMPT . . ---------
t Dv __HAVE_PTRACE_MACHDEP The port has MD .Xr ptrace 2 requests, defines .Dv PTRACE_MACHDEP_REQUEST_CASES macro with c case labels for its MD requests. . ---------
t Dv __HAVE_RAS Pq Xr ras 9 The port supports restartable atomic sequences. . ---------
t Dv __HAVE_SIMPLE_MUTEXES Pq Xr mutex 9 The port provides a CAS function that is either MP-safe, or does not need to be MP safe. Adaptive mutexes on these architectures do not require an additional interlock. . ---------
t Dv __HAVE_SPIN_MUTEX_STUBS Pq Xr mutex 9 The port provides fast path enter and exit stubs for spin mutexes. .El