comprehensive-rust/src/bare-metal/alloc.md

alloc

To use alloc you must implement a global (heap) allocator.

{{#include alloc-example/src/main.rs:Alloc}}

• buddy_system_allocator is a third-party crate implementing a basic buddy system allocator. Other crates are available, or you can write your own or hook into your existing allocator.
• The const parameter of LockedHeap is the max order of the allocator; i.e. in this case it can allocate regions of up to 2**32 bytes.