Added bit-fields crate

A bitflags like crate to support efficient
implementation of CPUID functionality.

Signed-off-by: Jonathan Woollett-Light <[email protected]>

Author: Jonathan Woollett-Light

Cargo.lock

@@ -1,5 +1,5 @@
 [workspace]
-members = ["src/firecracker", "src/jailer", "src/seccompiler", "src/rebase-snap"]
+members = ["src/firecracker", "src/jailer", "src/seccompiler", "src/rebase-snap", "src/bit-fields"]
 default-members = ["src/firecracker"]
 
 [profile.dev]

Cargo.toml

@@ -0,0 +1,22 @@
+[package]
+name = "bit-fields-macros"
+version = "0.1.0"
+authors = ["Amazon Firecracker team <[email protected]>"]
+edition = "2021"
+license = "Apache-2.0"
+
+[dependencies] 
+quote = "1.0.21"
+proc-macro2 = "1.0.43"
+thiserror = "1.0.32"
+# For converting bit flag member names to constant names.
+convert_case = "0.6.0"
+
+[dev-dependencies]
+rand = "0.8.5"
+
+[features]
+serde = []
+
+[lib]
+proc-macro = true