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-.\"-
-.\" Copyright (c) 2012 Robert N. M. Watson
-.\" All rights reserved.
-.\"
-.\" This software was developed by SRI International and the University of
-.\" Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
-.\" ("CTSRD"), as part of the DARPA CRASH research programme.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 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.
-.\"
-.\" 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 August 18, 2012
-.Dt ALTERA_AVGEN 4
-.Os
-.Sh NAME
-.Nm altera_avgen
-.Nd driver for generic Altera Avalon-bus-attached, memory-mapped devices
-.Sh SYNOPSIS
-.Cd "device altera_avgen"
-.Pp
-In
-.Pa /boot/device.hints :
-.Cd hint.altera_avgen.0.at="nexus0"
-.Cd hint.altera_avgen.0.maddr=0x7f00a000
-.Cd hint.altera_avgen.0.msize=20
-.Cd hint.altera_avgen.0.width=4
-.Cd hint.altera_avgen.0.fileio="rw"
-.Cd hint.altera_avgen.0.devname="berirom"
-.Sh DESCRIPTION
-The
-.Nm
-device driver provides generic support for memory-mapped devices on the
-Altera Avalon bus.
-.Pa device.hints
-entries configure the address, size, I/O disposition, and
-.Pa /dev
-device node name that will be used.
-The
-.Xr open 2 ,
-.Xr read 2 ,
-.Xr write 2 ,
-and
-.Xr mmap 2
-system calls (and variations) may be used on
-.Nm
-device nodes, subject to constraints imposed using
-.Pa device.hints
-entries.
-Although reading and writing mapped memory is supported,
-.Nm
-does not currently support directing device interrupts to userspace.
-.Pp
-A number of
-.Pa device.hints
-sub-fields are available to configure
-.Nm
-device instances:
-.Bl -tag -width devunit
-.It maddr
-base physical address of the memory region to export; must be aligned to
-.Li width
-.It msize
-length of the memory region export; must be aligned to
-.Li width
-.It width
-Granularity at which
-.Xr read 2
-and
-.Xr write 2
-operations will be performed.
-Larger requests will be broken down into
-.Li width -sized
-operations; smaller requests will be rejected.
-I/O operations must be aligned to
-.Li width .
-.It fileio
-allowed file descriptor operations;
-.Li r
-authorizes
-.Xr read 2 ;
-.Li w
-authorizes
-.Xr write 2 .
-.It mmapio
-allowed
-.Xr mmap 2
-permissions;
-.Li w
-authorizes
-.Dv PROT_WRITE ;
-.Li r
-authorizes
-.Dv PROT_READ ;
-.Li x
-authorizes
-.Dv PROT_EXEC .
-.It devname
-specifies a device name relative to
-.Pa /dev .
-.It devunit
-specifies a device unit number; no unit number is used if this is unspecified.
-.El
-.Sh SEE ALSO
-.Xr mmap 2 ,
-.Xr open 2 ,
-.Xr read 2 ,
-.Xr write 2
-.Sh HISTORY
-The
-.Nm
-device driver first appeared in
-.Fx 10.0 .
-.Sh AUTHORS
-The
-.Nm
-device driver and this manual page were
-developed by SRI International and the University of Cambridge Computer
-Laboratory under DARPA/AFRL contract
-.Pq FA8750-10-C-0237
-.Pq Do CTSRD Dc ,
-as part of the DARPA CRASH research programme.
-This device driver was written by
-.An Robert N. M. Watson .
-.Sh BUGS
-.Nm
-is intended to support the writing of userspace device drivers; however, it
-does not permit directing interrupts to userspace, only memory-mapped I/O.
-.Pp
-.Nm
-supports only a
-.Li nexus
-bus attachment, which is appropriate for system-on-chip busses such as
-Altera's Avalon bus.
-If the target device is off of another bus type, then additional bus
-attachments will be required.