refactor(kernel): ♻️ rewrite time manager

Kernel/subsystem/time/rtc.cpp

@@ -0,0 +1,111 @@
+/*
+	This file is part of Fennix Kernel.
+
+	Fennix Kernel is free software: you can redistribute it and/or
+	modify it under the terms of the GNU General Public License as
+	published by the Free Software Foundation, either version 3 of
+	the License, or (at your option) any later version.
+
+	Fennix Kernel is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with Fennix Kernel. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+#include <time.hpp>
+#include <debug.h>
+#include <io.h>
+
+namespace Time
+{
+	Clock ReadClock()
+	{
+		Clock tm;
+#if defined(__amd64__) || defined(__i386__)
+		uint32_t t = 0;
+		outb(0x70, 0x00);
+		t = inb(0x71);
+		tm.Second = ((t & 0x0F) + ((t >> 4) * 10));
+		outb(0x70, 0x02);
+		t = inb(0x71);
+		tm.Minute = ((t & 0x0F) + ((t >> 4) * 10));
+		outb(0x70, 0x04);
+		t = inb(0x71);
+		tm.Hour = ((t & 0x0F) + ((t >> 4) * 10));
+		outb(0x70, 0x07);
+		t = inb(0x71);
+		tm.Day = ((t & 0x0F) + ((t >> 4) * 10));
+		outb(0x70, 0x08);
+		t = inb(0x71);
+		tm.Month = ((t & 0x0F) + ((t >> 4) * 10));
+		outb(0x70, 0x09);
+		t = inb(0x71);
+		tm.Year = ((t & 0x0F) + ((t >> 4) * 10));
+		tm.Counter = 0;
+#elif defined(__aarch64__)
+		tm.Year = 0;
+		tm.Month = 0;
+		tm.Day = 0;
+		tm.Hour = 0;
+		tm.Minute = 0;
+		tm.Second = 0;
+		tm.Counter = 0;
+#endif
+		return tm;
+	}
+
+	Clock ConvertFromUnix(int Timestamp)
+	{
+		Clock result;
+
+		uint64_t Seconds = Timestamp;
+		uint64_t Minutes = Seconds / 60;
+		uint64_t Hours = Minutes / 60;
+		uint64_t Days = Hours / 24;
+
+		result.Year = 1970;
+		while (Days >= 365)
+		{
+			if (result.Year % 4 == 0 &&
+				(result.Year % 100 != 0 ||
+				 result.Year % 400 == 0))
+			{
+				if (Days >= 366)
+				{
+					Days -= 366;
+					result.Year++;
+				}
+				else
+					break;
+			}
+			else
+			{
+				Days -= 365;
+				result.Year++;
+			}
+		}
+
+		int DaysInMonth[] = {31,
+							 result.Year % 4 == 0
+								 ? 29
+								 : 28,
+							 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
+		for (result.Month = 0; result.Month < 12; result.Month++)
+		{
+			if (Days < s_cst(uint64_t, (DaysInMonth[result.Month])))
+				break;
+			Days -= DaysInMonth[result.Month];
+		}
+		result.Month++;
+
+		result.Day = s_cst(int, (Days) + 1);
+		result.Hour = s_cst(int, (Hours % 24));
+		result.Minute = s_cst(int, (Minutes % 60));
+		result.Second = s_cst(int, (Seconds % 60));
+		result.Counter = s_cst(uint64_t, (Timestamp));
+		return result;
+	}
+}