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+.\"	$NetBSD: virtio_mmio.4,v 1.3 2026/02/17 20:07:21 khorben Exp $
+.\"
+.\" Copyright (c) 2024 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 January 15, 2025
+.Dt VIRTIO_MMIO 4
+.Os
+.Sh NAME
+.Nm virtio_mmio
+.Nd VirtIO over memory mapped device
+.Sh SYNOPSIS
+.Cd "pv* at pv?"
+.Cd "virtio* at pv?"
+.Pp
+.Cd "acpi0 at mainbus0"
+.Cd "virtio* at acpi?"
+.Sh DESCRIPTION
+.Nm
+can be used in virtual environments without
+.Xr pci 4
+support
+.Pq a common situation in embedded devices models
+might use simple memory mapped device
+.Pq Nm
+instead of the
+.Xr pci 4
+device.
+.Pp
+The memory mapped
+.Xr virtio 4
+device behavior is based on the
+.Xr pci 4
+device specification.
+Therefore most operations including device initialization,
+queues configuration and buffer transfers are nearly identical.
+.Pp
+Unlike
+.Xr pci 4 ,
+.Nm
+provides no generic device discovery mechanism.
+For each device, the guest OS will
+need to know the location of the registers and interrupt(s) used.
+.Pp
+Device location can be read from either
+.Xr acpi 4
+or via kernel command line parameters, implemented as a
+.Xr pv 4
+virtual device.
+.Sh SEE ALSO
+.Xr acpi 4 ,
+.Xr pv 4 ,
+.Xr virtio 4
+.Pp
+.Rs
+.%T Virtual I/O Device (VIRTIO) Version 1.2
+.%U https://docs.oasis-open.org/virtio/virtio/v1.2/virtio-v1.2.html
+.Re