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a829251b | 1 | /* rtc_get_time_ms.c - get_time_ms implementation using platform RTC. |
2 | * The generic implementation of these functions can be used for architectures | |
3 | * or platforms that do not have a more specialized implementation. */ | |
4 | /* | |
5 | * GRUB -- GRand Unified Bootloader | |
6 | * Copyright (C) 2008 Free Software Foundation, Inc. | |
7 | * | |
8 | * GRUB is free software: you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation, either version 3 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * GRUB is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with GRUB. If not, see <http://www.gnu.org/licenses/>. | |
20 | */ | |
21 | ||
22 | #include <grub/time.h> | |
23 | #include <grub/misc.h> | |
7da036bb | 24 | #include <grub/machine/time.h> |
a829251b | 25 | |
26 | /* Calculate the time in milliseconds since the epoch based on the RTC. */ | |
27 | grub_uint64_t | |
28 | grub_rtc_get_time_ms (void) | |
29 | { | |
b39f9d20 | 30 | /* By dimensional analysis: |
31 | ||
a829251b | 32 | 1000 ms N rtc ticks 1 s |
33 | ------- * ----------- * ----------- = 1000*N/T ms | |
34 | 1 s 1 T rtc ticks | |
35 | */ | |
36 | grub_uint64_t ticks_ms_per_sec = ((grub_uint64_t) 1000) * grub_get_rtc (); | |
4e0a25a4 | 37 | return grub_divmod64 (ticks_ms_per_sec, GRUB_TICKS_PER_SECOND ? : 1000, 0); |
a829251b | 38 | } |