pit: fix pit_init and add freq argument

include/pit.h

@@ -3,6 +3,6 @@
 
 #include "../include/utils.h"
 
-void pit_init();
+void pit_init(int freq);
 
 #endif

src/isr.c

@@ -71,7 +71,7 @@ void default_handler()
 
 __attribute__((interrupt)) void isr_timer(struct interrupt_frame *frame)
 {
-	pit_init();
+	pit_init(100);
 	pic_end_int(0x0);
 }
 

src/kernel.c

@@ -22,7 +22,7 @@ void kmain()
 	printf("KatauOS booting up\n");
 	isr_install();
 	pic_remap(0x20, 0x28);
-	pit_init();
+	pit_init(100);
 
 	apply_pic_masks();
 

src/pit.c

@@ -26,12 +26,12 @@ Bit/s        Usage
 #define PIT_COMMAND_PORT 0x43
 #define PIT_DATA_PORT 0x40
 
-void pit_init() {
-    uint16_t frequency = 100;
+void pit_init(int freq) {
+    int divisor = 1193180 / freq;
     uint8_t command = 0x36;//00110110 see above to get the idea wtf is this number
 
     outb(PIT_COMMAND_PORT, command);
 
-    outb(PIT_DATA_PORT, (uint8_t)(frequency & 0xFF));
-    outb(PIT_DATA_PORT, (uint8_t)((frequency >> 8) & 0xFF));
+    outb(PIT_DATA_PORT, divisor & 0xFF);
+    outb(PIT_DATA_PORT, divisor >> 8);
 }