xref: /freebsd/stand/efi/libefi/time_event.c (revision 42249ef2)
1 /*-
2  * Copyright (c) 2016 Andrew Turner
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  *
14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24  * SUCH DAMAGE.
25  */
26 
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29 
30 #include <efi.h>
31 #include <efilib.h>
32 
33 #include <time.h>
34 #include <sys/time.h>
35 
36 static EFI_EVENT time_event;
37 static uint64_t curtime;
38 
39 static void
40 time_update(EFI_EVENT event, void *context)
41 {
42 
43 	curtime += 10;
44 }
45 
46 void
47 efi_time_init(void)
48 {
49 
50 	/* Create a timer event */
51 	BS->CreateEvent(EVT_TIMER | EVT_NOTIFY_SIGNAL, TPL_CALLBACK,
52 	    time_update, 0, &time_event);
53 	/* Use a 10ms timer */
54 	BS->SetTimer(time_event, TimerPeriodic, 100000);
55 }
56 
57 void
58 efi_time_fini(void)
59 {
60 
61 	/* Cancel the timer */
62 	BS->SetTimer(time_event, TimerCancel, 0);
63 	BS->CloseEvent(time_event);
64 }
65 
66 time_t
67 time(time_t *tloc)
68 {
69 	time_t t;
70 
71 	t = curtime / 1000;
72 	if (tloc != NULL)
73 		*tloc = t;
74 
75 	return (t);
76 }
77 
78 time_t
79 getsecs(void)
80 {
81     return time(0);
82 }
83