Add a much-needed get_blocks_from_size function

kernel/include/misc/utils.h

@@ -0,0 +1,8 @@
+#pragma once
+#include <stdint.h>
+
+namespace Utilities
+{
+    uint64_t get_blocks_from_size(uint64_t blocksize,
+                                  uint64_t size); // Returns how many blocks of size blocksize does size occupy.
+}

kernel/src/init/InitRD.cpp

@@ -5,6 +5,7 @@
 #include "io/Serial.h"
 #include "log/Log.h"
 #include "memory/MemoryManager.h"
+#include "misc/utils.h"
 #include "std/stdlib.h"
 #include <string.h>
 
@@ -56,7 +57,7 @@ InitRD::File InitRD::get_file(TarHeader* header)
         multiplier *= 8;
     }
     result.addr = (void*)((uint64_t)header + TAR_BLOCKSIZE);
-    result.size_in_blocks = (result.size + (TAR_BLOCKSIZE - 1)) / TAR_BLOCKSIZE;
+    result.size_in_blocks = Utilities::get_blocks_from_size(TAR_BLOCKSIZE, result.size);
     return result;
 }
 

kernel/src/misc/utils.cpp

@@ -0,0 +1,6 @@
+#include "misc/utils.h"
+
+uint64_t Utilities::get_blocks_from_size(uint64_t blocksize, uint64_t size)
+{
+    return (size + (blocksize - 1)) / blocksize;
+}