feat: implement basic timer

src/kernel/timer.h

@@ -0,0 +1,23 @@
+#ifndef TIMER_H
+#define TIMER_H
+#include <stdint.h>
+
+extern _Atomic uint64_t sys_ticks;
+extern const uint64_t tick_delta;
+
+// Initialize timer (1ms ticks)
+void timer_init();
+
+// Increment the system tick counter
+void timer_tick();
+
+// Get current time in milliseconds
+uint64_t timer_get_ms();
+
+// Delay for 'ms' milliseconds (blocking)
+void delay_ms(uint64_t ms);
+
+// Sleep for 'ms' milliseconds (non-blocking, if possible)
+void sleep_ms(uint64_t ms);
+
+#endif