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//! Top-level feature selection for [ArceOS].
//!
//! # Cargo Features
//!
//! - CPU
//!     - `smp`: Enable SMP (symmetric multiprocessing) support.
//!     - `fp_simd`: Enable floating point and SIMD support.
//! - Interrupts:
//!     - `irq`: Enable interrupt handling support.
//! - Memory
//!     - `alloc`: Enable dynamic memory allocation.
//!     - `alloc-tlsf`: Use the TLSF allocator.
//!     - `alloc-slab`: Use the slab allocator.
//!     - `alloc-buddy`: Use the buddy system allocator.
//!     - `paging`: Enable page table manipulation.
//!     - `tls`: Enable thread-local storage.
//! - Task management
//!     - `multitask`: Enable multi-threading support.
//!     - `sched_fifo`: Use the FIFO cooperative scheduler.
//!     - `sched_rr`: Use the Round-robin preemptive scheduler.
//!     - `sched_cfs`: Use the Completely Fair Scheduler (CFS) preemptive scheduler.
//! - Upperlayer stacks (fs, net, display)
//!     - `fs`: Enable file system support.
//!     - `myfs`: Allow users to define their custom filesystems to override the default.
//!     - `net`: Enable networking support.
//!     - `display`: Enable graphics support.
//! - Device drivers
//!     - `bus-mmio`: Use device tree to probe all MMIO devices.
//!     - `bus-pci`: Use PCI bus to probe all PCI devices.
//!     - `driver-ramdisk`: Use the RAM disk to emulate the block device.
//!     - `driver-ixgbe`: Enable the Intel 82599 10Gbit NIC driver.
//!     - `driver-bcm2835-sdhci`: Enable the BCM2835 SDHCI driver (Raspberry Pi SD card).
//! - Logging
//!     - `log-level-off`: Disable all logging.
//!     - `log-level-error`, `log-level-warn`, `log-level-info`, `log-level-debug`,
//!       `log-level-trace`: Keep logging only at the specified level or higher.
//!
//! [ArceOS]: https://github.com/arceos-org/arceos

#![no_std]