2006-11-04 20:16:24 +03:00
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.\" $NetBSD: vmem_xalloc.9,v 1.2 2006/11/04 17:16:24 wiz Exp $
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2006-11-04 15:55:28 +03:00
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.\"
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.\" Copyright (c)2006 YAMAMOTO Takashi,
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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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.\" ------------------------------------------------------------
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.Dd November 4, 2006
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.Dt VMEM_XALLOC 9
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.Os
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.\" ------------------------------------------------------------
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.Sh NAME
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.Nm vmem_xalloc
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.Nd Allocate resource from arena
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.\" ------------------------------------------------------------
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.Sh SYNOPSIS
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.In sys/vmem.h
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.\" - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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.Ft vmem_addr_t
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.Fn vmem_xalloc \
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"vmem_t *vm" "vmem_size_t size" "vmem_size_t align" \
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"vmem_size_t phase" "vmem_size_t nocross" "vmem_addr_t minaddr" \
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"vmem_addr_t maxaddr" "vm_flag_t flags"
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.\" ------------------------------------------------------------
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.Sh DESCRIPTION
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.Fn vmem_xalloc
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allocates a resource from the arena.
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.Pp
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.Bl -tag -width nocross
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.It Fa vm
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The arena which we allocate from.
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.It Fa size
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Specify the size of the allocation.
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.It Fa align
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If zero, don't care about the alignment of the allocation.
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2006-11-04 20:16:24 +03:00
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Otherwise, request a resource segment starting at
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2006-11-04 15:55:28 +03:00
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offset
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.Fa phase
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from an
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.Fa align
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aligned boundary.
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.It Fa phase
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See the above description of
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.Fa align .
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If
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.Fa align
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is zero,
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.Fa phase
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should be zero.
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Otherwise,
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.Fa phase
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should be smaller than
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.Fa align .
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.It Fa nocross
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Request a resource which doesn't cross
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.Fa nocross
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aligned boundary.
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.It Fa minaddr
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If non-zero, specify the minimum address which can be allocated.
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.It Fa maxaddr
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If non-zero, specify the maximum address + 1 which can be allocated.
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.It Fa flags
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A bitwise OR of an allocation strategy and a sleep flag.
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.Pp
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The allocation strategy is one of:
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.Bl -tag -width VM_INSTANTFIT
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.It Dv VM_BESTFIT
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Prefer space efficiency.
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.It Dv VM_INSTANTFIT
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Prefer performance.
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.El
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.Pp
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The sleep flag should be one of:
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.Bl -tag -width VM_NOSLEEP
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.It Dv VM_SLEEP
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Can sleep until enough resources are available.
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.It Dv VM_NOSLEEP
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Don't sleep.
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Immediately return
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.Dv VMEM_ADDR_NULL
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if there are not enough resources available.
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.El
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.El
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.\" ------------------------------------------------------------
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.Sh RETURN VALUES
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On success,
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.Fn vmem_xalloc
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returns an allocated vmem_addr_t.
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Otherwise, it returns
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.Dv VMEM_ADDR_NULL .
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.\" ------------------------------------------------------------
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.Sh SEE ALSO
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.Xr intro 9 ,
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.Xr vmem 9
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