xref: /dflybsd-src/share/man/man9/CPUMASK.9 (revision bd929a8f79a00da5969e3660b3100e3258365535)

.\"
.\" Copyright (c) 2016 The DragonFly Project.
.\" All rights reserved.
.\"
.\" 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.
.\" 3. Neither the name of The DragonFly Project nor the names of its
.\"    contributors may be used to endorse or promote products derived
.\"    from this software without specific, prior written permission.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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 July 24, 2016
.Dt CPUMASK 9
.Os
.Sh NAME
.Nm CPUMASK ,
.Nm ATOMIC_CPUMASK_COPY ,
.Nm ATOMIC_CPUMASK_NANDBIT ,
.Nm ATOMIC_CPUMASK_NANDMASK ,
.Nm ATOMIC_CPUMASK_ORBIT ,
.Nm ATOMIC_CPUMASK_ORMASK ,
.Nm ATOMIC_CPUMASK_TESTANDCLR ,
.Nm ATOMIC_CPUMASK_TESTANDSET ,
.Nm BSFCPUMASK ,
.Nm BSRCPUMASK ,
.Nm CPUMASK_ADDR ,
.Nm CPUMASK_ANDBIT ,
.Nm CPUMASK_ANDMASK ,
.Nm CPUMASK_ASSALLONES ,
.Nm CPUMASK_ASSBIT ,
.Nm CPUMASK_ASSBMASK ,
.Nm CPUMASK_ASSNBMASK ,
.Nm CPUMASK_ASSZERO ,
.Nm CPUMASK_CMPMASKEQ ,
.Nm CPUMASK_CMPMASKNEQ ,
.Nm CPUMASK_ISUP ,
.Nm CPUMASK_LOWMASK ,
.Nm CPUMASK_NANDBIT ,
.Nm CPUMASK_NANDMASK ,
.Nm CPUMASK_ORBIT ,
.Nm CPUMASK_ORMASK ,
.Nm CPUMASK_SIMPLE ,
.Nm CPUMASK_TESTBIT ,
.Nm CPUMASK_TESTMASK ,
.Nm CPUMASK_TESTNZERO ,
.Nm CPUMASK_TESTZERO ,
.Nm CPUMASK_XORMASK
.Nd Macros to manipulate cpumask_t fields
.Sh SYNOPSIS
.In machine/cpumask.h
.Fo ATOMIC_CPUMASK_COPY
.Fa "mask"
.Fa "val"
.Fc
.Fo ATOMIC_CPUMASK_NANDBIT
.Fa "mask"
.Fa "i"
.Fc
.Fo ATOMIC_CPUMASK_NANDMASK
.Fa "mask"
.Fa "val"
.Fc
.Fo ATOMIC_CPUMASK_ORBIT
.Fa "mask"
.Fa "i"
.Fc
.Fo ATOMIC_CPUMASK_ORMASK
.Fa "mask"
.Fa "val"
.Fc
.Fo ATOMIC_CPUMASK_TESTANDCLR
.Fa "mask"
.Fa "i"
.Fc
.Fo ATOMIC_CPUMASK_TESTANDSET
.Fa "mask"
.Fa "i"
.Fc
.Fo BSFCPUMASK
.Fa "val"
.Fc
.Fo BSRCPUMASK
.Fa "val"
.Fc
.Fo CPUMASK_ADDR
.Fa "mask"
.Fa "cpu"
.Fc
.Fo CPUMASK_ANDBIT
.Fa "mask"
.Fa "i"
.Fc
.Fo CPUMASK_ANDMASK
.Fa "mask"
.Fa "val"
.Fc
.Fo CPUMASK_ASSALLONES
.Fa "mask"
.Fc
.Fo CPUMASK_ASSBIT
.Fa "mask"
.Fa "i"
.Fc
.Fo CPUMASK_ASSBMASK
.Fa "mask"
.Fa "i"
.Fc
.Fo CPUMASK_ASSNBMASK
.Fa "mask"
.Fa "i"
.Fc
.Fo CPUMASK_ASSZERO
.Fa "mask"
.Fc
.Fo CPUMASK_CMPMASKEQ
.Fa "mask1"
.Fa "mask2"
.Fc
.Fo CPUMASK_CMPMASKNEQ
.Fa "mask1"
.Fa "mask2"
.Fc
.Fo CPUMASK_ISUP
.Fa "val"
.Fc
.Fo CPUMASK_LOWMASK
.Fa "val"
.Fc
.Fo CPUMASK_NANDBIT
.Fa "mask"
.Fa "i"
.Fc
.Fo CPUMASK_NANDMASK
.Fa "mask"
.Fa "val"
.Fc
.Fo CPUMASK_ORBIT
.Fa "mask"
.Fa "i"
.Fc
.Fo CPUMASK_ORMASK
.Fa "mask"
.Fa "val"
.Fc
.Fo CPUMASK_SIMPLE
.Fa "cpu"
.Fc
.Fo CPUMASK_TESTBIT
.Fa "val"
.Fa "i"
.Fc
.Fo CPUMASK_TESTMASK
.Fa "mask1"
.Fa "mask2"
.Fc
.Fo CPUMASK_TESTNZERO
.Fa "val"
.Fc
.Fo CPUMASK_TESTZERO
.Fa "val"
.Fc
.Fo CPUMASK_XORMASK
.Fa "mask"
.Fa "val"
.Fc
.Sh DESCRIPTION
The
.Nm
macros allow to safely manipulate the non standard type CPU bitmasks that uses
.Dv CPUMASK_ELEMENTS
of 64-bit words in
.Vt cpumask_t
type.
.Pp
Declared CPU mask variables can be initialized using one of
.Dv CPUMASK_INITIALIZER_ALLONES ,
.Dv CPUMASK_INITIALIZER_ONLYONE
macros.
.Pp
The
.Nm BSFCPUMASK
performs a "bit scan forward" assembler instruction over whole
.Vt cpumask_t
type, while the
.Nm BSRCPUMASK
performs a "bit scan reverse".
.Pp
Keep in mind that macros like
.Nm CPUMASK_SIMPLE
might only work in 64-bit mask range as they are provided as a convenience to
build more sophisticated macros.
.Pp
The
.Nm
macros with ATOMIC prefix perform
.Xr atomic 9
operations on the given CPU mask.
.Pp
When adding, modifying or removing CPUMASK macros, it is important to be
aware that these interfaces may be used by libraries, applications,
users or documentation.
Changing the
.Vt cpumask_t
length defined by
.Dv CPUMASK_ELEMENTS
requires adjustment of both
.Nm
macros and kernel assembly sources because
.Nm
are implemented as non variably-sized macros.