Create a memory module with a Frame struct and FrameAllocator trait

src/lib.rs

@@ -11,6 +11,7 @@ extern crate multiboot2;
 
 #[macro_use]
 mod vga_buffer;
+mod memory;
 
 #[no_mangle]
 pub extern fn rust_main(multiboot_information_address: usize) {

src/memory/mod.rs

@@ -0,0 +1,17 @@
+pub const PAGE_SIZE: usize = 4096;
+
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
+pub struct Frame {
+    number: usize,
+}
+
+impl Frame {
+    fn containing_address(address: usize) -> Frame {
+        Frame{ number: address / PAGE_SIZE }
+    }
+}
+
+pub trait FrameAllocator {
+    fn allocate_frame(&mut self) -> Option<Frame>;
+    fn deallocate_frame(&mut self, frame: Frame);
+}