Update bit_field to 0.5.0 and use new API

(cherry picked from commit 6eba03dd58)

Cargo.toml

@@ -4,7 +4,7 @@ name = "blog_os"
 version = "0.1.0"
 
 [dependencies]
-bit_field = "0.1.0"
+bit_field = "0.5.0"
 bitflags = "0.7.0"
 once = "0.2.1"
 rlibc = "0.1.4"

src/interrupts/idt.rs

@@ -66,11 +66,11 @@ impl Entry {
 use bit_field::BitField;
 
 #[derive(Debug, Clone, Copy)]
-pub struct EntryOptions(BitField<u16>);
+pub struct EntryOptions(u16);
 
 impl EntryOptions {
     fn minimal() -> Self {
-        let mut options = BitField::new(0);
+        let mut options = 0;
         options.set_range(9..12, 0b111); // 'must-be-one' bits
         EntryOptions(options)
     }