mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-26 01:20:25 +00:00
108 lines
3.3 KiB
C++
108 lines
3.3 KiB
C++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <AK/Assertions.h>
|
|
#include <AK/Time.h>
|
|
#include <Kernel/CMOS.h>
|
|
#include <Kernel/RTC.h>
|
|
|
|
namespace RTC {
|
|
|
|
static time_t s_boot_time;
|
|
|
|
void initialize()
|
|
{
|
|
s_boot_time = now();
|
|
}
|
|
|
|
time_t boot_time()
|
|
{
|
|
return s_boot_time;
|
|
}
|
|
|
|
static bool update_in_progress()
|
|
{
|
|
return CMOS::read(0x0a) & 0x80;
|
|
}
|
|
|
|
static u8 bcd_to_binary(u8 bcd)
|
|
{
|
|
return (bcd & 0x0F) + ((bcd >> 4) * 10);
|
|
}
|
|
|
|
void read_registers(unsigned& year, unsigned& month, unsigned& day, unsigned& hour, unsigned& minute, unsigned& second)
|
|
{
|
|
while (update_in_progress())
|
|
;
|
|
|
|
u8 status_b = CMOS::read(0x0b);
|
|
|
|
second = CMOS::read(0x00);
|
|
minute = CMOS::read(0x02);
|
|
hour = CMOS::read(0x04);
|
|
day = CMOS::read(0x07);
|
|
month = CMOS::read(0x08);
|
|
year = CMOS::read(0x09);
|
|
|
|
bool is_pm = hour & 0x80;
|
|
|
|
if (!(status_b & 0x04)) {
|
|
second = bcd_to_binary(second);
|
|
minute = bcd_to_binary(minute);
|
|
hour = bcd_to_binary(hour & 0x7F);
|
|
day = bcd_to_binary(day);
|
|
month = bcd_to_binary(month);
|
|
year = bcd_to_binary(year);
|
|
}
|
|
|
|
if (!(status_b & 0x02)) {
|
|
// In the 12 hour clock, midnight and noon are 12, not 0. Map it to 0.
|
|
hour %= 12;
|
|
if (is_pm)
|
|
hour += 12;
|
|
}
|
|
|
|
year += 2000;
|
|
}
|
|
|
|
time_t now()
|
|
{
|
|
// FIXME: We should probably do something more robust here.
|
|
// Perhaps read all the values twice and verify that they were identical.
|
|
// We don't want to be caught in the middle of an RTC register update.
|
|
while (update_in_progress())
|
|
;
|
|
|
|
unsigned year, month, day, hour, minute, second;
|
|
read_registers(year, month, day, hour, minute, second);
|
|
|
|
dmesgln("RTC: Year: {}, month: {}, day: {}, hour: {}, minute: {}, second: {}", year, month, day, hour, minute, second);
|
|
|
|
time_t days_since_epoch = years_to_days_since_epoch(year) + day_of_year(year, month, day);
|
|
return ((days_since_epoch * 24 + hour) * 60 + minute) * 60 + second;
|
|
}
|
|
|
|
}
|