Proper memory commitment

src/platform.h

@@ -2,9 +2,28 @@
 #include <stdlib.h>
 
 void *platform_malloc(size_t size);
-void platform_free(void *mem);
 U32 platform_page_size(void);
 
 void *memory_allocate(size_t size);
-void *memory_free(void *mem, size_t size);
+void *memory_reserve(size_t size);
+void memory_commit(void *mem, size_t size);
+void memory_decommit(void *mem, size_t size);
 
+void memory_free(void *mem, size_t size);
+
+
+static INLINE size_t AlignToPageEnd(size_t size)
+{
+    U32 page_size = platform_page_size();
+    size_t aligned_size = AlignUpPow2(size, page_size);
+
+    return aligned_size;
+}
+
+static INLINE size_t AlignToPageStart(size_t size)
+{
+    U32 page_size = platform_page_size();
+    size_t aligned_size = AlignDownPow2(size, page_size);
+
+    return aligned_size;
+}