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
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17 .\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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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)
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24 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 .\" $FreeBSD: head/share/man/man9/efirt.9 337957 2018-08-17 04:17:51Z kevans $
37 .Nm efi_get_time_capabilities ,
38 .Nm efi_reset_system ,
41 .Nm efi_var_nextname ,
43 .Nd kernel access to UEFI runtime services
49 .\".Fn efi_rt_ok "void"
51 .Fn efi_get_table "struct uuid *uuid" "void **ptr"
53 .Fn efi_get_time "struct efi_tm *tm"
55 .\".Fn efi_get_time_locked "struct efi_tm *tm"
57 .\".Fn efi_get_time_capabilities "struct efi_tmcap *tmcap"
59 .Fn efi_reset_system "void"
61 .Fn efi_set_time "struct efi_tm *tm"
63 .\".Fn efi_set_time_locked "struct efi_tm *tm"
65 .Fn efi_var_get "uint16_t *name" "struct uuid *vendor" "uint32_t *attrib" \
66 "size_t *datasize" "void *data"
68 .Fn efi_var_nextname "size_t *namesize" "uint16_t *name" "struct uuid *vendor"
70 .Fn efi_var_set "uint16_t *name" "struct uuid *vendor" "uint32_t *attrib" \
71 "size_t *datasize" "void *data"
73 .\"All of the following calls will return
75 .\"if UEFI runtime services are not available.
77 .\"is currently only available on amd64 and arm64.
81 .\"Returns 0 if UEFI runtime services are present and functional, or
87 function gets a table by uuid from the UEFI system table.
88 Returns 0 if the table was found and populates *ptr with the address.
91 if the configuration table or system table are unset.
94 if the requested table cannot be found.
98 function gets the current time from the RTC, if available.
99 Returns 0 and populates the
110 if the time could not be retrieved due to a hardware error.
113 .\".Fn efi_get_time_capabilities
114 .\"function gets the capabilities from the RTC.
115 .\"Returns 0 and populates the
116 .\".Vt struct efi_tmcap
126 .\"if the time could not be retrieved due to a hardware error.
130 function requests a warm reset and reboot of the system.
134 function sets the time on the RTC to the time described by the
137 Returns 0 on success,
139 if a time field is out of range, or
141 if the time could not be set due to a hardware error.
145 function fetches the variable identified by
149 Returns 0 and populates
155 Otherwise, one of the following errors are returned:
156 .Bl -tag -width ".Er EOVERFLOW"
158 The variable was not found.
161 is not sufficient to hold the variable data.
163 is updated to reflect the size needed to complete the request.
173 is large enough to hold the response but
177 The variable could not be retrieved due to a hardware error.
179 The variable could not be retireved due to an authentication failure.
184 function is used for enumeration of variables.
185 On the initial call to
186 .Fn efi_var_nextname ,
188 should be an empty string.
189 Subsequent calls should pass in the last
196 Returns 0 and populates
201 with the next variable's data.
202 Otherwise, returns one of the following errors:
203 .Bl -tag -width ".Er EOVERFLOW"
205 The next variable was not found.
208 is not sufficient to hold the variable data.
210 is updated to reflect the size needed to complete the request.
219 The variable could not be retrieved due to a hardware error.
224 function sets the variable described by
228 Returns 0 if the variable has been successfully.
229 Otherwise, returns one of the following errors:
230 .Bl -tag -width ".Er EOVERFLOW"
234 was an invalid combination of attributes,
236 exceeds the maximum allowed size, or
238 is an empty Unicode stirng.
240 Not enough storage is available to hold the variable and its data.
242 The variable could not be saved due to a hardware error.
244 The variable in question is read-only or may not be deleted.
246 The varialbe could not be set due to an authentication failure.
248 The variable trying to be updated or deleted was not found.
253 This manual page was written by
254 .An Kyle Evans Aq Mt kevans@FreeBSD.org .