mirror of
https://github.com/SerenityOS/serenity
synced 2024-07-22 18:46:18 +00:00
939600d2d4
"Wherever applicable" = most places, actually :^), especially for networking and filesystem timestamps. This includes changes to unzip, which uses DOSPackedTime, since that is changed for the FAT file systems.
120 lines
3.4 KiB
C++
120 lines
3.4 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Format.h>
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#include <AK/Time.h>
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#include <Kernel/Arch/Delay.h>
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#include <Kernel/Arch/x86_64/CMOS.h>
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#include <Kernel/Arch/x86_64/RTC.h>
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namespace Kernel::RTC {
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static time_t s_boot_time;
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void initialize()
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{
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s_boot_time = now();
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}
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UnixDateTime boot_time()
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{
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return UnixDateTime::from_seconds_since_epoch(s_boot_time);
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}
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static bool update_in_progress()
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{
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return CMOS::read(0x0a) & 0x80;
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}
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static u8 bcd_to_binary(u8 bcd)
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{
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return (bcd & 0x0F) + ((bcd >> 4) * 10);
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}
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static bool try_to_read_registers(unsigned& year, unsigned& month, unsigned& day, unsigned& hour, unsigned& minute, unsigned& second)
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{
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// Note: Let's wait 0.01 seconds until we stop trying to query the RTC CMOS
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size_t time_passed_in_milliseconds = 0;
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bool update_in_progress_ended_successfully = false;
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while (time_passed_in_milliseconds < 100) {
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if (!update_in_progress()) {
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update_in_progress_ended_successfully = true;
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break;
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}
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microseconds_delay(1000);
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time_passed_in_milliseconds++;
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}
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if (!update_in_progress_ended_successfully) {
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year = 1970;
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month = 1;
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day = 1;
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hour = 0;
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minute = 0;
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second = 0;
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return false;
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}
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u8 status_b = CMOS::read(0x0b);
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second = CMOS::read(0x00);
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minute = CMOS::read(0x02);
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hour = CMOS::read(0x04);
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day = CMOS::read(0x07);
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month = CMOS::read(0x08);
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year = CMOS::read(0x09);
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bool is_pm = hour & 0x80;
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if (!(status_b & 0x04)) {
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second = bcd_to_binary(second);
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minute = bcd_to_binary(minute);
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hour = bcd_to_binary(hour & 0x7F);
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day = bcd_to_binary(day);
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month = bcd_to_binary(month);
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year = bcd_to_binary(year);
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}
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if (!(status_b & 0x02)) {
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// In the 12 hour clock, midnight and noon are 12, not 0. Map it to 0.
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hour %= 12;
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if (is_pm)
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hour += 12;
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}
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year += 2000;
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return true;
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}
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time_t now()
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{
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auto check_registers_against_preloaded_values = [](unsigned year, unsigned month, unsigned day, unsigned hour, unsigned minute, unsigned second) {
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unsigned checked_year, checked_month, checked_day, checked_hour, checked_minute, checked_second;
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if (!try_to_read_registers(checked_year, checked_month, checked_day, checked_hour, checked_minute, checked_second))
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return false;
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return checked_year == year && checked_month == month && checked_day == day && checked_hour == hour && checked_minute == minute && checked_second == second;
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};
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unsigned year, month, day, hour, minute, second;
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bool did_read_rtc_successfully = false;
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for (size_t attempt = 0; attempt < 5; attempt++) {
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if (!try_to_read_registers(year, month, day, hour, minute, second))
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break;
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if (check_registers_against_preloaded_values(year, month, day, hour, minute, second)) {
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did_read_rtc_successfully = true;
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break;
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}
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}
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dmesgln("RTC: {} Year: {}, month: {}, day: {}, hour: {}, minute: {}, second: {}", (did_read_rtc_successfully ? "" : "(failed to read)"), year, month, day, hour, minute, second);
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time_t days = days_since_epoch(year, month, day);
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return ((days * 24 + hour) * 60 + minute) * 60 + second;
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}
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}
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