d266177a8e
The goal is to use security features when architectures provide them. Reported by: kib Sponsored by: Dell EMC Isilon
82 lines
2.6 KiB
Groff
82 lines
2.6 KiB
Groff
.\"
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.\" Copyright (c) 2003 Bruce M Simpson <bms@spc.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd February 15, 2018
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.Dt PMAP_QENTER 9
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.Os
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.Sh NAME
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.Nm pmap_qenter ,
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.Nm pmap_qremove
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.Nd manage temporary kernel space mappings
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.Sh SYNOPSIS
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.In sys/param.h
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.In vm/vm.h
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.In vm/pmap.h
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.Ft void
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.Fn pmap_qenter "vm_offset_t sva" "vm_page_t *m" "int count"
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.Ft void
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.Fn pmap_qremove "vm_offset_t sva" "int count"
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.Sh DESCRIPTION
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The
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.Fn pmap_qenter
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function accepts a linear array of
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.Fa count
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pointers to wired pages
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.Fa *m ,
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and enters each of these pages into the kernel virtual address (KVA) space,
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beginning at the address
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.Fa sva .
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The pages are mapped non-executable, if possible.
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(For example, non-PAE i386 has no capability to map pages non-executable.)
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.Pp
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The
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.Fn pmap_qremove
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function tears out a mapping from the kernel virtual address space,
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beginning at
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.Fa sva
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and for
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.Fa count
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pages.
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.Sh IMPLEMENTATION NOTES
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The
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.Fn pmap_qenter
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function is intended for temporary mappings that do not require page
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modification or reference counting.
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Old mappings are simply overwritten.
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The pages
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.Em must
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be wired into physical memory.
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.Pp
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The corresponding
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.Fn pmap_qremove
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function is intended to remove such temporary mappings.
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.Sh SEE ALSO
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.Xr pmap 9
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.Sh AUTHORS
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This manual page was written by
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.An Bruce M Simpson Aq Mt bms@spc.org .
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