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96 lines
2.8 KiB
Groff
96 lines
2.8 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 July 19, 2003
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.Dt VM_MAP_SUBMAP 9
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.Os
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.Sh NAME
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.Nm vm_map_submap
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.Nd create a subordinate map
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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/vm_map.h
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.Ft int
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.Fo vm_map_submap
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.Fa "vm_map_t map" "vm_offset_t start" "vm_offset_t end" "vm_map_t submap"
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.Fc
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.Sh DESCRIPTION
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The
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.Fn vm_map_submap
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function marks the range bounded by
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.Fa start
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and
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.Fa end
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within the map
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.Fa map
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as being handled by a subordinate map
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.Fa sub_map .
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.Pp
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It is generally called by the kernel memory allocator.
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.Sh IMPLEMENTATION NOTES
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This function is for internal use only.
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.Pp
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Both maps must exist.
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The range must have been created with
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.Xr vm_map_find 9
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previously.
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.Pp
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No other operations may have been performed on this range
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before calling this function.
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Only the
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.Fn vm_fault
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operation may be performed within this range after calling
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this function.
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.Pp
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To remove a submapping, one must first remove the range from
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the parent
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.Fa map ,
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and then destroy the
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.Fa sub_map .
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This procedure is not recommended.
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.Sh RETURN VALUES
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The
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.Fn vm_map_submap
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function returns
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.Dv KERN_SUCCESS
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if successful.
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.Pp
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Otherwise, it returns
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.Dv KERN_INVALID_ARGUMENT
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if the caller requested copy-on-write flags,
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or if the range specified for the sub-map was out of range for the parent map,
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or if a
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.Dv NULL
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backing object was specified.
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.Sh SEE ALSO
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.Xr vm_map 9 ,
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.Xr vm_map_find 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 bms@spc.org .
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