2 .\" SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 .\" Copyright (c) 2018 Kyle Evans <kevans@FreeBSD.org>
6 .\" Redistribution and use in source and binary forms, with or without
7 .\" modification, are permitted provided that the following conditions
9 .\" 1. Redistributions of source code must retain the above copyright
10 .\" notice, this list of conditions and the following disclaimer.
11 .\" 2. Redistributions in binary form must reproduce the above copyright
12 .\" notice, this list of conditions and the following disclaimer in the
13 .\" documentation and/or other materials provided with the distribution.
15 .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 .\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 .\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 .\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 .\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 .\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 .\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 .Nm efi_get_time_capabilities ,
38 .Nm efi_reset_system ,
41 .Nm efi_var_nextname ,
43 .Nd kernel access to UEFI runtime services
51 .Fn efi_get_table "struct uuid *uuid" "void **ptr"
53 .Fn efi_get_time "struct efi_tm *tm"
55 .Fn efi_get_time_capabilities "struct efi_tmcap *tmcap"
57 .Fn efi_reset_system "void"
59 .Fn efi_set_time "struct efi_tm *tm"
61 .Fn efi_var_get "uint16_t *name" "struct uuid *vendor" "uint32_t *attrib" \
62 "size_t *datasize" "void *data"
64 .Fn efi_var_nextname "size_t *namesize" "uint16_t *name" "struct uuid *vendor"
66 .Fn efi_var_set "uint16_t *name" "struct uuid *vendor" "uint32_t *attrib" \
67 "size_t *datasize" "void *data"
69 All of the following calls will return
71 if UEFI runtime services are not available.
73 is currently only available on amd64 and arm64.
77 Returns 0 if UEFI runtime services are present and functional, or
83 function gets a table by uuid from the UEFI system table.
84 Returns 0 if the table was found and populates *ptr with the address.
87 if the configuration table or system table are unset.
90 if the requested table cannot be found.
94 function gets the current time from the RTC, if available.
95 Returns 0 and populates the
106 if the time could not be retrieved due to a hardware error.
109 .Fn efi_get_time_capabilities
110 function gets the capabilities from the RTC.
111 Returns 0 and populates the
122 if the time could not be retrieved due to a hardware error.
126 function requests a warm reset and reboot of the system.
130 function sets the time on the RTC to the time described by the
133 Returns 0 on success,
135 if a time field is out of range, or
137 if the time could not be set due to a hardware error.
141 function fetches the variable identified by
145 Returns 0 and populates
151 Otherwise, one of the following errors are returned:
152 .Bl -tag -width ".Dv EOVERFLOW"
154 The variable was not found.
157 is not sufficient to hold the variable data.
159 is updated to reflect the size needed to complete the request.
169 is large enough to hold the response but
173 The variable could not be retrieved due to a hardware error.
175 The variable could not be retireved due to an authentication failure.
180 function is used for enumeration of variables.
181 On the initial call to
182 .Fn efi_var_nextname ,
184 should be an empty string.
185 Subsequent calls should pass in the last
192 Returns 0 and populates
197 with the next variable's data.
198 Otherwise, returns one of the following errors:
199 .Bl -tag -width ".Dv EOVERFLOW"
201 The next variable was not found.
204 is not sufficient to hold the variable data.
206 is updated to reflect the size needed to complete the request.
215 The variable could not be retrieved due to a hardware error.
220 function sets the variable described by
224 Returns 0 if the variable has been successfully.
225 Otherwise, returns one of the following errors:
226 .Bl -tag -width ".Dv EOVERFLOW"
230 was an invalid combination of attributes,
232 exceeds the maximum allowed size, or
234 is an empty Unicode stirng.
236 Not enough storage is available to hold the variable and its data.
238 The variable could not be saved due to a hardware error.
240 The variable in question is read-only or may not be deleted.
242 The varialbe could not be set due to an authentication failure.
244 The variable trying to be updated or deleted was not found.
249 This manual page was written by
250 .An Kyle Evans Aq Mt kevans@FreeBSD.org .