Re-add: ATA PIO driver (w/o paging)

src/kernel/kmain.c

@@ -4,6 +4,7 @@
 #include "idt.h"
 #include "system.h"
 #include "paging.h"
+#include "../drivers/ata.h"
 
 char* ascii_title =
 "\n"
@@ -39,6 +40,8 @@ void kmain(unsigned int multiboot_info_address)
   init_paging();
   printf("Hello, paging world!\n");
 
+  //test_read_sector();
+
   uint32_t *ptr = (uint32_t*)0xA0000000;
   uint32_t do_page_fault = *ptr;