buddy_system_allocator

buddy_system_allocator is a crate that implements a basic buddy system allocator. It can be used both to implement GlobalAlloc (using LockedHeap) so you can use the standard alloc crate (as we saw before), or for allocating other address space (using FrameAllocator) . For example, we might want to allocate MMIO space for PCI BARs:

# // Copyright 2023 Google LLC
# // SPDX-License-Identifier: Apache-2.0
#
{{#include allocator-example/src/main.rs:main}}

• PCI BARs always have alignment equal to their size.
• Run the example with cargo run under src/bare-metal/useful-crates/allocator-example/. (It won't run in the Playground because of the crate dependency.)