feat: add no_std support

Signed-off-by: 周睿 <zrufo747@outlook.com>

Author: ZR233

CHANGELOG.md

@@ -3,6 +3,9 @@
 ## Upcoming version
 
 ### Added
+
+- Support for no_std environments.
+
 ### Changed
 ### Fixed
 ### Removed

Cargo.toml

@@ -9,7 +9,11 @@ keywords = ["resources", "allocation", "address", "virt"]
 license = "Apache-2.0 OR BSD-3-Clause"
 edition = "2018"
 
+[features]
+default = ["std"]
+std = []
+
 [dependencies]
 libc = "0.2.39"
-thiserror = "2.0"
+thiserror = {version= "2.0", default-features = false}
 serde = { version = "1.0.137", optional = true, features = ["derive"] }

src/allocation_engine/interval_tree.rs

@@ -4,6 +4,8 @@
 
 use std::cmp::{max, Ordering};
 
+use alloc::boxed::Box;
+
 use crate::{AllocPolicy, Constraint, Error, RangeInclusive, Result};
 
 /// Returns the first multiple of `alignment` that is lower or equal to the

src/id_allocator.rs

@@ -8,7 +8,8 @@
 //! that can be abstracted to an integer.
 
 use crate::{Error, Result};
-use std::collections::BTreeSet;
+use alloc::collections::BTreeSet;
+
 
 /// An unique ID allocator that allows management of IDs in a given interval.
 // Internal representation of IdAllocator. Contains the ends of the interval

src/lib.rs

@@ -74,6 +74,12 @@
 //! ```
 
 #![deny(missing_docs)]
+#![cfg_attr(not(feature = "std"), no_std)]
+
+extern crate alloc;
+
+#[cfg(not(feature = "std"))]
+extern crate core as std;
 
 mod address_allocator;
 /// Allocation engine used by address allocator.