1.\" 2.\" This file and its contents are supplied under the terms of the 3.\" Common Development and Distribution License ("CDDL"), version 1.0. 4.\" You may only use this file in accordance with the terms of version 5.\" 1.0 of the CDDL. 6.\" 7.\" A full copy of the text of the CDDL should have accompanied this 8.\" source. A copy of the CDDL is also available via the Internet at 9.\" http://www.illumos.org/license/CDDL. 10.\" 11.\" 12.\" Copyright 2021 Oxide Computer Company 13.\" 14.Dd September 26, 2020 15.Dt AMDZEN 4D 16.Os 17.Sh NAME 18.Nm amdzen , 19.Nm amdzen_stub 20.Nd AMD Zen Nexus Driver 21.Sh DESCRIPTION 22The 23.Nm 24driver provides access to the Northbridge, Data Fabric, and System 25Management Network 26.Pq SMN 27for a number of AMD processor lines, including AMD Ryzen CPUs and APUs, 28ThreadRipper CPUs, and EPYC CPUs from the following families: 29.Bl -bullet 30.It 31AMD Zen Naples, Summit Ridge, Whitehaven 32.Pq Family 17h 33.It 34AMD Zen+ Colfax, Picasso, and Pinnacle Ridge 35.Pq Family 17h 36.It 37AMD Zen 2 Castle Peak, Matisse, Rome, and Renoir 38.Pq Family 17h 39.It 40AMD Zen 3 Cezanne, Milan, and Vermeer 41.Pq Family 19h 42.El 43.Pp 44This driver is a nexus driver and facilitates access to the northbridge, 45data fabric, and SMN between various other devices such as 46.Xr smntemp 4D . 47The various processor devices that make up the northbridge and data 48fabric have the 49.Sy amdzen_stub 50driver attached to them. 51The different devices are all amalgamated and a single uniform view is 52provided by the 53.Sy amdzen 54driver. 55.Pp 56The 57.Nm 58driver is a nexus driver that has the following children: 59.Bl -tag -width "smntemp(4D)" 60.It Xr smntemp 4D 61Provides access to on-die temperature sensors. 62.It Xr usmn 4D 63Provides read access to the SMN. 64This driver is intended for development purposes. 65.It Xr zen_udf 4D 66Provides read access to the data fabric. 67This driver is intended for development purposes. 68.El 69.Sh ARCHITECTURE 70The 71.Sy amdzen 72and 73.Sy amdzen_stub 74drivers are limited to 75.Sy x86 76platforms with AMD Family 17h and 19h processors. 77.Sh SEE ALSO 78.Xr smntemp 4D , 79.Xr usmn 4D , 80.Xr zen_udf 4D 81