1.\" $NetBSD: tpm.4,v 1.7 2021/01/19 05:05:39 riastradh Exp $ 2.\" 3.\" Copyright (c) 2019 The NetBSD Foundation, Inc. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to The NetBSD Foundation 7.\" by Maxime Villard. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 19.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 20.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 21.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 22.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 23.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 24.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 25.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 26.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 27.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 28.\" POSSIBILITY OF SUCH DAMAGE. 29.\" 30.Dd January 15, 2021 31.Dt TPM 4 32.Os 33.Sh NAME 34.Nm tpm 35.Nd Trusted Platform Module 36.Sh SYNOPSIS 37.Cd "tpm* at isa? iomem 0xfed40000" 38.Cd "tpm* at acpi?" 39.Sh DESCRIPTION 40The 41.Nm 42driver provides support for various Trusted Platform Module (TPM) chips. 43.Pp 44Supported modules: 45.Pp 46.Bl -bullet -compact -offset indent 47.It 48TPM 2.0 chips over ACPI 49.It 50TPM 1.2 chips over ACPI and ISA 51.El 52.Pp 53Note that the supported interface version is TIS1.2 in each case. 54.Pp 55The TPM may need to be enabled in the system's firmware or BIOS, which 56requires a reboot to take effect. 57This is generally beyond the control of 58.Nx . 59Enabling a TPM does not require using trusted boot \(em it can be 60enabled, for example, only for the 61.Xr rnd 4 62entropy source. 63.Sh SEE ALSO 64.Xr config 1 , 65.Xr intro 4 , 66.Xr rnd 4 67.Sh AUTHORS 68.An -nosplit 69The 70.Nm 71driver was written by 72.An Maxime Villard , 73.An Michael Shalayeff 74and 75.An Hans-Joerg Hoexer . 76