1/* $NetBSD: efigetsecs.c,v 1.5 2021/10/06 10:13:19 jmcneill Exp $ */ 2 3/* 4 * Copyright (c) 2015 YASUOKA Masahiko <yasuoka@yasuoka.net> 5 * Copyright (c) 2018 Jared McNeill <jmcneill@invisible.ca> 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20#include "efiboot.h" 21 22#include <lib/libsa/net.h> 23 24static EFI_EVENT getsecs_ev = 0; 25static satime_t getsecs_val = 0; 26 27static satime_t 28getsecs_rtc(void) 29{ 30 static const int daytab[][14] = { 31 { 0, -1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364 }, 32 { 0, -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 }, 33 }; 34 EFI_TIME t; 35 satime_t r; 36 int y; 37#define isleap(_y) (((_y) % 4) == 0 && (((_y) % 100) != 0 || ((_y) % 400) == 0)) 38 39 uefi_call_wrapper(RT->GetTime, 2, &t, NULL); 40 41 /* Calc days from UNIX epoch */ 42 r = (t.Year - 1970) * 365; 43 for (y = 1970; y < t.Year; y++) { 44 if (isleap(y)) 45 r++; 46 } 47 r += daytab[isleap(t.Year) ? 1 : 0][t.Month] + t.Day; 48 49 /* Calc secs */ 50 r *= 60 * 60 * 24; 51 r += ((t.Hour * 60) + t.Minute) * 60 + t.Second; 52 if (-24 * 60 < t.TimeZone && t.TimeZone < 24 * 60) 53 r += t.TimeZone * 60; 54 55 return r; 56} 57 58static EFIAPI void 59getsecs_notify_func(EFI_EVENT ev, VOID *context) 60{ 61 getsecs_val++; 62} 63 64satime_t 65getsecs(void) 66{ 67 EFI_STATUS status; 68 69 if (getsecs_ev == 0) { 70 status = uefi_call_wrapper(BS->CreateEvent, 5, EVT_TIMER | EVT_NOTIFY_SIGNAL, TPL_CALLBACK, 71 getsecs_notify_func, 0, &getsecs_ev); 72 if (EFI_ERROR(status)) 73 panic("%s: couldn't create event timer: 0x%lx", __func__, (u_long)status); 74 status = uefi_call_wrapper(BS->SetTimer, 3, getsecs_ev, TimerPeriodic, 10000000); /* 1s in "100ns" units */ 75 if (EFI_ERROR(status)) 76 panic("%s: couldn't start event timer: 0x%lx", __func__, (u_long)status); 77 getsecs_val = getsecs_rtc(); 78 } 79 80 return getsecs_val; 81} 82