feat: Massive OS expansion with IPC, Sound & TTS, Block layer, FAT32/ext2/sysfs, Signals, Syscalls, Modules, Drivers & 50+ LazyBox applets

drivers/rtc/rtc.c

@@ -0,0 +1,42 @@
+#include <drivers/rtc.h>
+#include <arch/x86_64/io.h>
+#include <lib/printf.h>
+#include <kernel/printk.h>
+
+#define CMOS_ADDRESS 0x70
+#define CMOS_DATA    0x71
+
+static uint8_t get_rtc_register(int reg) {
+    outb(CMOS_ADDRESS, (uint8_t)reg);
+    return inb(CMOS_DATA);
+}
+
+static uint8_t bcd2bin(uint8_t bcd) {
+    return (uint8_t)(((bcd >> 4) * 10) + (bcd & 0x0F));
+}
+
+void rtc_init(void) {
+    rtc_time_t t;
+    rtc_get_time(&t);
+    printk(KERN_INFO "RTC: CMOS Real-Time Clock synchronized (%04u-%02u-%02u %02u:%02u:%02u UTC)\n",
+           t.year, t.month, t.day, t.hour, t.minute, t.second);
+}
+
+void rtc_get_time(rtc_time_t* time) {
+    if (!time) return;
+
+    time->second = bcd2bin(get_rtc_register(0x00));
+    time->minute = bcd2bin(get_rtc_register(0x02));
+    time->hour   = bcd2bin(get_rtc_register(0x04));
+    time->day    = bcd2bin(get_rtc_register(0x07));
+    time->month  = bcd2bin(get_rtc_register(0x08));
+    time->year   = 2000 + bcd2bin(get_rtc_register(0x09));
+}
+
+void rtc_format_string(char* buf, size_t max_len) {
+    if (!buf || max_len == 0) return;
+    rtc_time_t t;
+    rtc_get_time(&t);
+    snprintf(buf, max_len, "%04u-%02u-%02u %02u:%02u:%02u UTC",
+             t.year, t.month, t.day, t.hour, t.minute, t.second);
+}