doing some memory work and gdt and timer and vga

kernel/timer.c

@@ -0,0 +1,28 @@
+#include "timer.h"
+#include "io.h"
+#include "isr.h"
+#include "terminal.h"
+
+static uint32_t tick = 0;
+
+void timer_callback(void) {
+    tick++;
+    // Optional: Print every 100 ticks
+    // if (tick % 100 == 0) {
+    //     terminal_write("Tick\n");
+    // }
+}
+
+void timer_init(uint32_t frequency) {
+    register_interrupt_handler(32, timer_callback); // IRQ0 = Interrupt 32
+
+    uint32_t divisor = 1193180 / frequency;
+
+    outb(0x43, 0x36);             // Command byte
+    outb(0x40, divisor & 0xFF);   // Low byte
+    outb(0x40, (divisor >> 8));   // High byte
+}
+
+uint32_t timer_get_ticks(void) {
+    return tick;
+}