Add Revision constants

Add constants for all the EFI versions (from section 4.3 "EFI System Table").

Author: nicholasbishop

src/table/revision.rs

@@ -9,6 +9,27 @@ use core::fmt;
 #[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd)]
 pub struct Revision(u32);
 
+// Allow missing docs, there's nothing useful to document about these
+// constants.
+#[allow(missing_docs)]
+// Allow consistent formatting of the values.
+#[allow(clippy::identity_op)]
+impl Revision {
+    pub const EFI_1_02: Self = Self((1 << 16) | (2));
+    pub const EFI_1_10: Self = Self((1 << 16) | (10));
+    pub const EFI_2_00: Self = Self((2 << 16) | (00));
+    pub const EFI_2_10: Self = Self((2 << 16) | (10));
+    pub const EFI_2_20: Self = Self((2 << 16) | (20));
+    pub const EFI_2_30: Self = Self((2 << 16) | (30));
+    pub const EFI_2_31: Self = Self((2 << 16) | (31));
+    pub const EFI_2_40: Self = Self((2 << 16) | (40));
+    pub const EFI_2_50: Self = Self((2 << 16) | (50));
+    pub const EFI_2_60: Self = Self((2 << 16) | (60));
+    pub const EFI_2_70: Self = Self((2 << 16) | (70));
+    pub const EFI_2_80: Self = Self((2 << 16) | (80));
+    pub const EFI_2_90: Self = Self((2 << 16) | (90));
+}
+
 impl Revision {
     /// Creates a new revision.
     pub fn new(major: u16, minor: u16) -> Self {
@@ -35,3 +56,17 @@ impl fmt::Debug for Revision {
         write!(f, "{}.{}.{}", major, minor / 10, minor % 10)
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_revision() {
+        let rev = Revision::EFI_2_31;
+        assert_eq!(rev.major(), 2);
+        assert_eq!(rev.minor(), 31);
+
+        assert!(Revision::EFI_1_10 < Revision::EFI_2_00);
+    }
+}