Sort errors. Remove superfluous macros.
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@ -1,4 +1,4 @@
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.\" $NetBSD: bus_space.9,v 1.52 2017/11/12 21:14:33 riastradh Exp $
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.\" $NetBSD: bus_space.9,v 1.53 2017/11/13 09:10:37 wiz Exp $
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.\"
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.\" Copyright (c) 1997 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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@ -1047,16 +1047,16 @@ is undefined, and
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returns a non-zero error code.
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Possible error codes include
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.Bl -tag -width EOPNOTSUPP -offset indent
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.It Er ENOMEM
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There was not sufficient bus space at
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.Fa bpa
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to satisfy the request.
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.It Er EOPNOTSUPP
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.Fn bus_space_reserve
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is not supported on this architecture, or
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.Fa flags
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was incompatible with the bus space represented by
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.Fa t .
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.It Er ENOMEM
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There was not sufficient bus space at
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.Fa bpa
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to satisfy the request.
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.El
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.Pp
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.It Fn bus_space_reserve_subregion "t" "reg_start" "reg_end" \
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@ -1091,16 +1091,16 @@ is undefined, and
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returns a non-zero error code.
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Possible error codes include
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.Bl -tag -width EOPNOTSUPP -offset indent
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.It Er ENOMEM
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There was not sufficient bus space at
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.Fa bpa
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to satisfy the request.
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.It Er EOPNOTSUPP
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.Fn bus_space_reserve
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is not supported on this architecture, or
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.Fa flags
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was incompatible with the bus space represented by
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.Fa t .
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.It Er ENOMEM
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There was not sufficient bus space at
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.Fa bpa
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to satisfy the request.
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.El
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.Pp
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.It Fn bus_space_release "t" "bsr"
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@ -1388,7 +1388,6 @@ input port, and are placed by the device on a stack, the top of
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which is read by reading from the output port.
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The sequence to correctly write two data bytes to the device then read
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those two data bytes back would be:
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.Pp
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.Bd -literal
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/*
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* t and h are the tag and handle for the mapped device's
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@ -1425,7 +1424,6 @@ It is correct (and often easier) to make barrier operations cover the
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device's whole range of bus space, that is, to specify an offset of zero
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and the size of the whole region.
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.El
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.El
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.Sh REGION OPERATIONS
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Some devices use buffers which are mapped as regions in bus space.
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Often, drivers want to copy the contents of those buffers to or from
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@ -1900,7 +1898,6 @@ The definition of the
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functions should not yet be considered finalized.
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There are several changes and improvements which should be explored,
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including:
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.Pp
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.Bl -bullet
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.It
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Providing a mechanism by which incorrectly-written drivers will be
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