Add a dependency on bit_field

Cargo.toml

@@ -7,6 +7,7 @@ authors = ["Philipp Oppermann <dev@phil-opp.com>"]
 crate-type = ["staticlib"]
 
 [dependencies]
+bit_field = "0.7.0"
 rlibc = "1.0"
 volatile = "0.1.0"
 spin = "0.4.5"

src/lib.rs

@@ -24,6 +24,7 @@ extern crate once;
 extern crate linked_list_allocator;
 #[macro_use]
 extern crate lazy_static;
+extern crate bit_field;
 #[macro_use]
 mod vga_buffer;
 mod memory;