Add spin_wait function

Simple pure rust spin wait

rust_experiments/src/lib.rs

@@ -186,16 +186,31 @@ pub extern fn rust_main(multiboot_info_header: usize) {
 
     //let boot_info = unsafe { multiboot2::load(multiboot_info_header) };
 
-    printstr::write_to_screen(6, "hello you person: {}");
+    printstr::write_to_screen(6, "Gamarjoba munde");
+
+    let mut i: u32 = 0;
+
+    util::spin_wait(100_000_000);
+
+    printstr::write_to_screen(2, "HELLA");
 
     loop {
 
     }
 }
 
-// 123  |3,2,1
 mod util {
 
+    pub fn spin_wait(count: u32) {
+        let mut i: u32 = 0;
+        loop {
+            i += 1;
+            if i > count {
+                break;
+            }
+        }
+    }
+
     pub fn lo_hi_bits(n: u16) -> (u8, u8) {
         ( (n & 0xff) as u8, (n >> 8) as u8)
     }