Add missing docs in aster-frame

framework/aster-frame/src/arch/mod.rs

@@ -1,5 +1,9 @@
 // SPDX-License-Identifier: MPL-2.0
 
+//! Platform-specific code.
+//!
+//! Each architecture that Asterinas supports may contain a submodule here.
+
 #[cfg(target_arch = "x86_64")]
 pub mod x86;
 

framework/aster-frame/src/arch/x86/console.rs

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: MPL-2.0
 
+//! The console I/O.
+
 #![allow(dead_code)]
 #![allow(unused_variables)]
 
@@ -13,13 +15,16 @@ use trapframe::TrapFrame;
 use super::{device::serial::SerialPort, kernel::IO_APIC};
 use crate::{sync::SpinLock, trap::IrqLine};
 
+/// Prints the formatted arguments to the standard output.
 #[inline]
 pub fn print(args: fmt::Arguments) {
     Stdout.write_fmt(args).unwrap();
 }
 
+/// The callback function for console input.
 pub type InputCallback = dyn Fn(u8) + Send + Sync + 'static;
 
+/// Registers a callback function to be called when there is console input.
 pub fn register_console_input_callback(f: &'static InputCallback) {
     SERIAL_INPUT_CALLBACKS.lock_irq_disabled().push(Arc::new(f));
 }

framework/aster-frame/src/arch/x86/cpu.rs

@@ -38,12 +38,14 @@ pub fn this_cpu() -> u32 {
     0
 }
 
+/// A set of CPUs.
 #[derive(Default)]
 pub struct CpuSet {
     bitset: BitVec,
 }
 
 impl CpuSet {
+    /// Creates a new `CpuSet` with all CPUs included.
     pub fn new_full() -> Self {
         let num_cpus = num_cpus();
         let mut bitset = BitVec::with_capacity(num_cpus as usize);
@@ -51,6 +53,7 @@ impl CpuSet {
         Self { bitset }
     }
 
+    /// Creates a new `CpuSet` with no CPUs included.
     pub fn new_empty() -> Self {
         let num_cpus = num_cpus();
         let mut bitset = BitVec::with_capacity(num_cpus as usize);
@@ -58,38 +61,46 @@ impl CpuSet {
         Self { bitset }
     }
 
+    /// Adds a CPU with identifier `cpu_id` to the `CpuSet`.
     pub fn add(&mut self, cpu_id: u32) {
         self.bitset.set(cpu_id as usize, true);
     }
 
+    /// Adds multiple CPUs from a vector to the `CpuSet`.
     pub fn add_from_vec(&mut self, cpu_ids: Vec<u32>) {
         for cpu_id in cpu_ids {
             self.add(cpu_id)
         }
     }
 
+    /// Adds all available CPUs to the `CpuSet`.
     pub fn add_all(&mut self) {
         self.bitset.fill(true);
     }
 
+    /// Removes a CPU with identifier `cpu_id` from the `CpuSet`.
     pub fn remove(&mut self, cpu_id: u32) {
         self.bitset.set(cpu_id as usize, false);
     }
 
+    /// Removes multiple CPUs from a vector from the `CpuSet`.
     pub fn remove_from_vec(&mut self, cpu_ids: Vec<u32>) {
         for cpu_id in cpu_ids {
             self.remove(cpu_id);
         }
     }
 
+    /// Clears the `CpuSet`, removing all CPUs.
     pub fn clear(&mut self) {
         self.bitset.fill(false);
     }
 
+    /// Checks if the `CpuSet` contains a specific CPU.
     pub fn contains(&self, cpu_id: u32) -> bool {
         self.bitset.get(cpu_id as usize).as_deref() == Some(&true)
     }
 
+    /// Returns an iterator over the set CPUs.
     pub fn iter(&self) -> IterOnes<'_, usize, Lsb0> {
         self.bitset.iter_ones()
     }
@@ -104,11 +115,15 @@ pub struct UserContext {
     cpu_exception_info: CpuExceptionInfo,
 }
 
+/// CPU exception information.
 #[derive(Clone, Default, Copy, Debug)]
 #[repr(C)]
 pub struct CpuExceptionInfo {
+    /// The ID of the exception.
     pub id: usize,
+    /// The error code associated with the exception.
     pub error_code: usize,
+    /// The virtual address where a page fault occurred.
     pub page_fault_addr: usize,
 }
 
@@ -212,6 +227,7 @@ impl TdxTrapFrame for GeneralRegs {
     }
 }
 
+/// User Preemption.
 pub struct UserPreemption {
     count: u32,
 }
@@ -219,10 +235,12 @@ pub struct UserPreemption {
 impl UserPreemption {
     const PREEMPTION_INTERVAL: u32 = 100;
 
+    /// Creates a new instance of `UserPreemption`.
     pub const fn new() -> Self {
         UserPreemption { count: 0 }
     }
 
+    /// Checks if preemption might occur and takes necessary actions.
     pub fn might_preempt(&mut self) {
         self.count = (self.count + 1) % Self::PREEMPTION_INTERVAL;
 
@@ -235,22 +253,27 @@ impl UserPreemption {
 }
 
 impl UserContext {
+    /// Returns a reference to the general registers.
     pub fn general_regs(&self) -> &GeneralRegs {
         &self.user_context.general
     }
 
+    /// Returns a mutable reference to the general registers
     pub fn general_regs_mut(&mut self) -> &mut GeneralRegs {
         &mut self.user_context.general
     }
 
+    /// Returns the trap information.
     pub fn trap_information(&self) -> &CpuExceptionInfo {
         &self.cpu_exception_info
     }
 
+    /// Returns a reference to the floating point registers
     pub fn fp_regs(&self) -> &FpRegs {
         &self.fp_regs
     }
 
+    /// Returns a mutable reference to the floating point registers
     pub fn fp_regs_mut(&mut self) -> &mut FpRegs {
         &mut self.fp_regs
     }
@@ -358,17 +381,26 @@ impl UserContextApiInternal for UserContext {
 /// So here we also define FaultOrTrap and Interrupt
 #[derive(PartialEq, Eq, Debug)]
 pub enum CpuExceptionType {
+    /// CPU faults. Faults can be corrected, and the program may continue as if nothing happened.
     Fault,
+    /// CPU traps. Traps are reported immediately after the execution of the trapping instruction
     Trap,
+    /// Faults or traps
     FaultOrTrap,
+    /// CPU interrupts
     Interrupt,
+    /// Some severe unrecoverable error
     Abort,
+    /// Reserved for future use
     Reserved,
 }
 
+/// CPU exception.
 #[derive(Debug, Eq, PartialEq)]
 pub struct CpuException {
+    /// The ID of the CPU exception.
     pub number: u16,
+    /// The type of the CPU exception.
     pub typ: CpuExceptionType,
 }
 
@@ -390,6 +422,7 @@ macro_rules! define_cpu_exception {
             $($name,)*
         ];
         $(
+            #[doc = concat!("The ", stringify!($name), " exception")]
             pub const $name : CpuException = CpuException{
                 number: $exception_num,
                 typ: CpuExceptionType::$exception_type,
@@ -462,10 +495,12 @@ bitflags! {
 }
 
 impl CpuException {
+    /// Checks if the given `trap_num` is a valid CPU exception.
     pub fn is_cpu_exception(trap_num: u16) -> bool {
         trap_num < EXCEPTION_LIST.len() as u16
     }
 
+    /// Maps a `trap_num` to its corresponding CPU exception.
     pub fn to_cpu_exception(trap_num: u16) -> Option<&'static CpuException> {
         EXCEPTION_LIST.get(trap_num as usize)
     }
@@ -501,11 +536,13 @@ macro_rules! cpu_context_impl_getter_setter {
     ( $( [ $field: ident, $setter_name: ident] ),*) => {
         impl UserContext {
             $(
+                #[doc = concat!("Gets the value of ", stringify!($field))]
                 #[inline(always)]
                 pub fn $field(&self) -> usize {
                     self.user_context.general.$field
                 }
 
+                #[doc = concat!("Sets the value of ", stringify!(field))]
                 #[inline(always)]
                 pub fn $setter_name(&mut self, $field: usize) {
                     self.user_context.general.$field = $field;

framework/aster-frame/src/arch/x86/device/mod.rs

@@ -3,6 +3,9 @@
 //! Device-related APIs.
 //! This module mainly contains the APIs that should exposed to the device driver like PCI, RTC
 
+// FIXME: remove this lint when the documentation of this module is extensively added.
+#![allow(missing_docs)]
+
 pub mod cmos;
 pub mod io_port;
 pub mod serial;

framework/aster-frame/src/arch/x86/iommu/mod.rs

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: MPL-2.0
 
+//! The IOMMU support.
+
 mod context_table;
 mod fault;
 mod remapping;
@@ -17,9 +19,12 @@ use crate::{
     sync::Mutex,
 };
 
+/// An enumeration representing possible errors related to IOMMU.
 #[derive(Debug)]
 pub enum IommuError {
+    /// No IOMMU is available.
     NoIommu,
+    /// Error encountered during modification of the page table.
     ModificationError(PageTableError),
 }
 

framework/aster-frame/src/arch/x86/irq.rs

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: MPL-2.0
 
+//! Interrupts.
+
 #![allow(dead_code)]
 
 use alloc::{boxed::Box, fmt::Debug, sync::Arc, vec::Vec};

framework/aster-frame/src/arch/x86/mod.rs

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: MPL-2.0
 
+//! Platform-specific code for the x86 platform.
+
 pub mod boot;
 pub mod console;
 pub(crate) mod cpu;

framework/aster-frame/src/arch/x86/qemu.rs

@@ -10,7 +10,9 @@
 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
 #[repr(u32)]
 pub enum QemuExitCode {
+    /// The code that indicates a successful exit.
     Success = 0x10,
+    /// The code that indicates a failed exit.
     Failed = 0x20,
 }
 

framework/aster-frame/src/arch/x86/task/mod.rs

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: MPL-2.0
 
+//! The architecture support of context switch.
+
 use crate::task::TaskContextApi;
 
 core::arch::global_asm!(include_str!("switch.S"));
@@ -23,12 +25,19 @@ impl TaskContext {
 #[derive(Debug, Default, Clone, Copy)]
 #[repr(C)]
 pub struct CalleeRegs {
+    /// RSP
     pub rsp: u64,
+    /// RBX
     pub rbx: u64,
+    /// RBP
     pub rbp: u64,
+    /// R12
     pub r12: u64,
+    /// R13
     pub r13: u64,
+    /// R14
     pub r14: u64,
+    /// R15
     pub r15: u64,
 }
 

framework/aster-frame/src/arch/x86/timer/mod.rs

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: MPL-2.0
 
+//! The timer support.
+
 mod apic;
 mod hpet;
 mod jiffies;

framework/aster-frame/src/boot/kcmdline.rs

@@ -27,9 +27,12 @@ struct InitprocArgs {
     envp: Vec<CString>,
 }
 
+/// Kernel module arguments
 #[derive(PartialEq, Debug, Clone)]
 pub enum ModuleArg {
+    /// A string argument
     Arg(CString),
+    /// A key-value argument
     KeyVal(CString, CString),
 }
 

framework/aster-frame/src/boot/memory_region.rs

@@ -71,6 +71,7 @@ impl MemoryRegion {
         self.len
     }
 
+    /// Checks whether the region is empty
     pub fn is_empty(&self) -> bool {
         self.len == 0
     }

framework/aster-frame/src/boot/mod.rs

@@ -36,8 +36,11 @@ pub enum BootloaderAcpiArg {
 /// The framebuffer arguments.
 #[derive(Copy, Clone, Debug)]
 pub struct BootloaderFramebufferArg {
+    /// The address of the buffer.
     pub address: usize,
+    /// The width of the buffer.
     pub width: usize,
+    /// The height of the buffer.
     pub height: usize,
     /// Bits per pixel of the buffer.
     pub bpp: usize,

framework/aster-frame/src/bus/mod.rs

@@ -1,14 +1,23 @@
 // SPDX-License-Identifier: MPL-2.0
 
+//! Bus operations
+
+// FIXME: remove this lint when the docs of the whole bus module are added.
+#![allow(missing_docs)]
+
 pub mod mmio;
 pub mod pci;
 
+/// An error that occurs during bus probing.
 #[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
 pub enum BusProbeError {
+    /// The device does not match the expected criteria.
     DeviceNotMatch,
+    /// An error in accessing the configuration space of the device.
     ConfigurationSpaceError,
 }
 
+/// Initializes the bus
 pub fn init() {
     pci::init();
     mmio::init();

framework/aster-frame/src/console.rs

@@ -1,11 +1,15 @@
 // SPDX-License-Identifier: MPL-2.0
 
+//! Console output.
+
 use core::fmt::Arguments;
 
+/// Prints formatted arguments to the console.
 pub fn print(args: Arguments) {
     crate::arch::console::print(args);
 }
 
+/// Prints to the console.
 #[macro_export]
 macro_rules! early_print {
   ($fmt: literal $(, $($arg: tt)+)?) => {
@@ -13,6 +17,7 @@ macro_rules! early_print {
   }
 }
 
+/// Prints to the console, with a newline.
 #[macro_export]
 macro_rules! early_println {
   () => { $crate::early_print!("\n") };

framework/aster-frame/src/error.rs

@@ -5,13 +5,21 @@ use crate::mm::page_table::PageTableError;
 /// The error type which is returned from the APIs of this crate.
 #[derive(Clone, Copy, PartialEq, Eq, Debug)]
 pub enum Error {
+    /// Invalid arguments provided.
     InvalidArgs,
+    /// Insufficient memory available.
     NoMemory,
+    /// Page fault occurred.
     PageFault,
+    /// Access to a resource is denied.
     AccessDenied,
+    /// Input/output error.
     IoError,
+    /// Insufficient system resources.
     NotEnoughResources,
+    /// Arithmetic Overflow occurred.
     Overflow,
+    /// Memory mapping already exists for the given virtual address.
     MapAlreadyMappedVaddr,
 }
 

framework/aster-frame/src/io_mem.rs

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: MPL-2.0
 
+//! I/O memory.
+
 use core::{mem::size_of, ops::Range};
 
 use pod::Pod;
@@ -9,6 +11,7 @@ use crate::{
     Error, Result,
 };
 
+/// I/O memory.
 #[derive(Debug, Clone)]
 pub struct IoMem {
     virtual_address: Vaddr,
@@ -59,6 +62,8 @@ impl HasPaddr for IoMem {
 }
 
 impl IoMem {
+    /// Creates a new `IoMem`.
+    ///
     /// # Safety
     ///
     /// User must ensure the given physical range is in the I/O memory region.
@@ -69,14 +74,21 @@ impl IoMem {
         }
     }
 
+    /// Returns the physical address of the I/O memory.
     pub fn paddr(&self) -> Paddr {
         self.virtual_address - LINEAR_MAPPING_BASE_VADDR
     }
 
+    /// Returns the length of the I/O memory region.
     pub fn length(&self) -> usize {
         self.limit
     }
 
+    /// Resizes the I/O memory region to the new `range`.
+    ///
+    /// # Errors
+    ///
+    /// Returns an error if the new `range` is not within the current range.
     pub fn resize(&mut self, range: Range<Paddr>) -> Result<()> {
         let start_vaddr = paddr_to_vaddr(range.start);
         let virtual_end = self

framework/aster-frame/src/lib.rs

@@ -20,6 +20,7 @@
 // const generic implementation. We are using this feature in a conservative manner.
 #![allow(incomplete_features)]
 #![no_std]
+#![warn(missing_docs)]
 
 extern crate alloc;
 #[cfg(ktest)]

framework/aster-frame/src/logger.rs

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: MPL-2.0
 
+//! Logging support.
+
 use log::{Level, Metadata, Record};
 
 use crate::early_println;

framework/aster-frame/src/mm/dma/dma_stream.rs

@@ -40,13 +40,16 @@ struct DmaStreamInner {
 /// prevents users from reading and writing to `DmaStream` unexpectedly.
 #[derive(Debug, PartialEq, Clone, Copy)]
 pub enum DmaDirection {
+    /// Data flows to the device
     ToDevice,
+    /// Data flows form the device
     FromDevice,
+    /// Data flows both from and to the device
     Bidirectional,
 }
 
 impl DmaStream {
-    /// Establish DMA stream mapping for a given `Segment`.
+    /// Establishes DMA stream mapping for a given [`Segment`].
     ///
     /// The method fails if the segment already belongs to a DMA mapping.
     pub fn map(
@@ -98,7 +101,7 @@ impl DmaStream {
         })
     }
 
-    /// Get the underlying VM segment.
+    /// Get the underlying [`VmSegment`].
     ///
     /// Usually, the CPU side should not access the memory
     /// after the DMA mapping is established because
@@ -108,10 +111,12 @@ impl DmaStream {
         &self.inner.vm_segment
     }
 
+    /// Returns the number of frames
     pub fn nframes(&self) -> usize {
         self.inner.vm_segment.nframes()
     }
 
+    /// Returns the number of bytes
     pub fn nbytes(&self) -> usize {
         self.inner.vm_segment.nbytes()
     }
@@ -120,10 +125,13 @@ impl DmaStream {
     ///
     /// This method should be called under one of the two conditions:
     /// 1. The data of the stream DMA mapping has been updated by the device side.
-    /// The CPU side needs to call the `sync` method before reading data (e.g., using `read_bytes`).
+    /// The CPU side needs to call the `sync` method before reading data (e.g., using [`read_bytes`]).
     /// 2. The data of the stream DMA mapping has been updated by the CPU side
-    /// (e.g., using `write_bytes`).
+    /// (e.g., using [`write_bytes`]).
     /// Before the CPU side notifies the device side to read, it must call the `sync` method first.
+    ///
+    /// [`read_bytes`]: Self::read_bytes
+    /// [`write_bytes`]: Self::write_bytes
     pub fn sync(&self, byte_range: Range<usize>) -> Result<(), Error> {
         if byte_range.end > self.nbytes() {
             return Err(Error::InvalidArgs);

framework/aster-frame/src/mm/dma/mod.rs

@@ -31,6 +31,7 @@ pub enum DmaError {
     AlreadyMapped,
 }
 
+/// Has mapped address in the device address space.
 pub trait HasDaddr {
     /// Get the base address of the mapping in the
     /// device address space.

framework/aster-frame/src/mm/mod.rs

@@ -107,13 +107,16 @@ pub(crate) const KERNEL_VADDR_RANGE: Range<Vaddr> = 0xffff_8000_0000_0000..0xfff
 
 /// Get physical address trait
 pub trait HasPaddr {
+    /// Returns the physical address.
     fn paddr(&self) -> Paddr;
 }
 
+/// Checks if the given address is page-aligned.
 pub const fn is_page_aligned(p: usize) -> bool {
     (p & (PAGE_SIZE - 1)) == 0
 }
 
+/// Memory regions used for frame buffer.
 pub static FRAMEBUFFER_REGIONS: Once<Vec<MemoryRegion>> = Once::new();
 
 pub(crate) fn misc_init() {

framework/aster-frame/src/mm/page_prop.rs

@@ -9,7 +9,9 @@ use bitflags::bitflags;
 /// The property of a mapped virtual memory page.
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
 pub struct PageProperty {
+    /// The flags associated with the page,
     pub flags: PageFlags,
+    /// The cache policy for the page.
     pub cache: CachePolicy,
     pub(crate) priv_flags: PrivilegedPageFlags,
 }

framework/aster-frame/src/mm/space.rs

@@ -127,7 +127,7 @@ impl VmSpace {
     /// Query about the mapping information about a byte in virtual memory.
     /// This is more handy than [`query_range`], but less efficient if you want
     /// to query in a batch.
-    /// 
+    ///
     /// [`query_range`]: VmSpace::query_range
     pub fn query(&self, vaddr: Vaddr) -> Result<Option<PageProperty>> {
         if !(0..MAX_USERSPACE_VADDR).contains(&vaddr) {

framework/aster-frame/src/panicking.rs

@@ -46,7 +46,7 @@ pub fn panic_handler(info: &core::panic::PanicInfo) -> ! {
     abort();
 }
 
-// Aborts the QEMU
+/// Aborts the QEMU
 pub fn abort() -> ! {
     exit_qemu(QemuExitCode::Failed);
 }

framework/aster-frame/src/prelude.rs

@@ -2,6 +2,7 @@
 
 //! The prelude.
 
+/// A specialized [`core::result::Result``] type for this crate.
 pub type Result<T> = core::result::Result<T, crate::error::Error>;
 
 pub(crate) use alloc::{boxed::Box, sync::Arc, vec::Vec};

framework/aster-frame/src/sync/mod.rs

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: MPL-2.0
 
+//! Useful synchronization primitives.
+
 mod atomic_bits;
 mod mutex;
 // TODO: refactor this rcu implementation

framework/aster-frame/src/sync/mutex.rs

@@ -92,7 +92,10 @@ pub struct MutexGuard_<T: ?Sized, R: Deref<Target = Mutex<T>>> {
     mutex: R,
 }
 
+/// A guard that provides exclusive access to the data protected by a [`Mutex`].
 pub type MutexGuard<'a, T> = MutexGuard_<T, &'a Mutex<T>>;
+
+/// An guard that provides exclusive access to the data protected by a [`Arc<Mutex>`].
 pub type ArcMutexGuard<T> = MutexGuard_<T, Arc<Mutex<T>>>;
 
 impl<T: ?Sized, R: Deref<Target = Mutex<T>>> Deref for MutexGuard_<T, R> {

framework/aster-frame/src/sync/rwlock.rs

@@ -544,7 +544,10 @@ pub struct RwLockReadGuard_<T: ?Sized, R: Deref<Target = RwLock<T>> + Clone> {
     inner: R,
 }
 
+/// A guard that provides shared read access to the data protected by a [`RwLock`].
 pub type RwLockReadGuard<'a, T> = RwLockReadGuard_<T, &'a RwLock<T>>;
+
+/// A guard that provides shared read access to the data protected by a [`Arc<RwLock>`].
 pub type ArcRwLockReadGuard<T> = RwLockReadGuard_<T, Arc<RwLock<T>>>;
 
 impl<T: ?Sized, R: Deref<Target = RwLock<T>> + Clone> Deref for RwLockReadGuard_<T, R> {
@@ -575,7 +578,9 @@ pub struct RwLockWriteGuard_<T: ?Sized, R: Deref<Target = RwLock<T>> + Clone> {
     inner: R,
 }
 
+/// A guard that provides exclusive write access to the data protected by a [`RwLock`].
 pub type RwLockWriteGuard<'a, T> = RwLockWriteGuard_<T, &'a RwLock<T>>;
+/// A guard that provides exclusive write access to the data protected by a [`Arc<RwLock>`].
 pub type ArcRwLockWriteGuard<T> = RwLockWriteGuard_<T, Arc<RwLock<T>>>;
 
 impl<T: ?Sized, R: Deref<Target = RwLock<T>> + Clone> Deref for RwLockWriteGuard_<T, R> {
@@ -644,7 +649,9 @@ pub struct RwLockUpgradeableGuard_<T: ?Sized, R: Deref<Target = RwLock<T>> + Clo
     inner: R,
 }
 
+/// A upgradable guard that provides read access to the data protected by a [`RwLock`].
 pub type RwLockUpgradeableGuard<'a, T> = RwLockUpgradeableGuard_<T, &'a RwLock<T>>;
+/// A upgradable guard that provides read access to the data protected by a [`Arc<RwLock>`].
 pub type ArcRwLockUpgradeableGuard<T> = RwLockUpgradeableGuard_<T, Arc<RwLock<T>>>;
 
 impl<T: ?Sized, R: Deref<Target = RwLock<T>> + Clone> RwLockUpgradeableGuard_<T, R> {

framework/aster-frame/src/sync/rwmutex.rs

@@ -225,7 +225,9 @@ pub struct RwMutexReadGuard_<T: ?Sized, R: Deref<Target = RwMutex<T>>> {
     inner: R,
 }
 
+/// A guard that provides shared read access to the data protected by a [`RwMutex`].
 pub type RwMutexReadGuard<'a, T> = RwMutexReadGuard_<T, &'a RwMutex<T>>;
+/// A guard that provides shared read access to the data protected by a [`Arc<RwMutex>`].
 pub type ArcRwMutexReadGuard<T> = RwMutexReadGuard_<T, Arc<RwMutex<T>>>;
 
 impl<T: ?Sized, R: Deref<Target = RwMutex<T>>> Deref for RwMutexReadGuard_<T, R> {
@@ -250,7 +252,9 @@ pub struct RwMutexWriteGuard_<T: ?Sized, R: Deref<Target = RwMutex<T>>> {
     inner: R,
 }
 
+/// A guard that provides exclusive write access to the data protected by a [`RwMutex`].
 pub type RwMutexWriteGuard<'a, T> = RwMutexWriteGuard_<T, &'a RwMutex<T>>;
+/// A guard that provides exclusive write access to the data protected by a [`Arc<RwMutex>`].
 pub type ArcRwMutexWriteGuard<T> = RwMutexWriteGuard_<T, Arc<RwMutex<T>>>;
 
 impl<T: ?Sized, R: Deref<Target = RwMutex<T>>> Deref for RwMutexWriteGuard_<T, R> {
@@ -315,7 +319,9 @@ pub struct RwMutexUpgradeableGuard_<T: ?Sized, R: Deref<Target = RwMutex<T>>> {
     inner: R,
 }
 
+/// A upgradable guard that provides read access to the data protected by a [`RwMutex`].
 pub type RwMutexUpgradeableGuard<'a, T> = RwMutexUpgradeableGuard_<T, &'a RwMutex<T>>;
+/// A upgradable guard that provides read access to the data protected by a [`Arc<RwMutex>`].
 pub type ArcRwMutexUpgradeableGuard<T> = RwMutexUpgradeableGuard_<T, Arc<RwMutex<T>>>;
 
 impl<T: ?Sized, R: Deref<Target = RwMutex<T>> + Clone> RwMutexUpgradeableGuard_<T, R> {

framework/aster-frame/src/sync/spin.rs

@@ -135,7 +135,9 @@ enum InnerGuard {
     PreemptGuard(DisablePreemptGuard),
 }
 
+/// A guard that provides exclusive access to the data protected by a [`SpinLock`].
 pub type SpinLockGuard<'a, T> = SpinLockGuard_<T, &'a SpinLock<T>>;
+/// A guard that provides exclusive access to the data protected by a [`Arc<SpinLock>`].
 pub type ArcSpinLockGuard<T> = SpinLockGuard_<T, Arc<SpinLock<T>>>;
 
 /// The guard of a spin lock that disables the local IRQs.

framework/aster-frame/src/task/priority.rs

@@ -3,6 +3,7 @@
 pub const REAL_TIME_TASK_PRIORITY: u16 = 100;
 
 /// The priority of a task.
+///
 /// Similar to Linux, a larger value represents a lower priority,
 /// with a range of 0 to 139. Priorities ranging from 0 to 99 are considered real-time,
 /// while those ranging from 100 to 139 are considered normal.
@@ -10,39 +11,52 @@ pub const REAL_TIME_TASK_PRIORITY: u16 = 100;
 pub struct Priority(u16);
 
 impl Priority {
+    /// Creates a new `Priority` with the specified value.
+    ///
+    /// # Panics
+    ///
+    /// Panics if the `val` is greater than 139.
     pub const fn new(val: u16) -> Self {
         assert!(val <= 139);
         Self(val)
     }
 
+    /// Returns a `Priority` representing the lowest priority (139).
     pub const fn lowest() -> Self {
         Self::new(139)
     }
 
+    /// Returns a `Priority` representing a low priority.
     pub const fn low() -> Self {
         Self::new(110)
     }
 
+    /// Returns a `Priority` representing a normal priority.
     pub const fn normal() -> Self {
         Self::new(100)
     }
 
+    /// Returns a `Priority` representing a high priority.
     pub const fn high() -> Self {
         Self::new(10)
     }
 
+    /// Returns a `Priority` representing the highest priority (0).
     pub const fn highest() -> Self {
         Self::new(0)
     }
 
+    /// Sets the value of the `Priority`.
     pub const fn set(&mut self, val: u16) {
         self.0 = val;
     }
 
+    /// Returns the value of the `Priority`.
     pub const fn get(self) -> u16 {
         self.0
     }
 
+    /// Checks if the `Priority` is considered a real-time priority.
     pub const fn is_real_time(&self) -> bool {
         self.0 < REAL_TIME_TASK_PRIORITY
     }

framework/aster-frame/src/task/processor.rs

@@ -55,6 +55,7 @@ pub fn take_current_task() -> Option<Arc<Task>> {
     })
 }
 
+/// Retrieves the current task running on the processor.
 pub fn current_task() -> Option<Arc<Task>> {
     CpuLocal::borrow_with(&PROCESSOR, |processor| processor.borrow().current())
 }
@@ -72,10 +73,10 @@ pub fn schedule() {
     }
 }
 
-// TODO: This interface of this method is error prone.
+/// TODO: This interface of this method is error prone.
-// The method takes an argument for the current task to optimize its efficiency,
+/// The method takes an argument for the current task to optimize its efficiency,
-// but the argument provided by the caller may not be the current task, really.
+/// but the argument provided by the caller may not be the current task, really.
-// Thus, this method should be removed or reworked in the future.
+/// Thus, this method should be removed or reworked in the future.
 pub fn preempt(task: &Arc<Task>) {
     // TODO: Refactor `preempt` and `schedule`
     // after the Atomic mode and `might_break` is enabled.
@@ -219,6 +220,7 @@ impl Drop for DisablePreemptGuard {
     }
 }
 
+/// Disables preemption.
 #[must_use]
 pub fn disable_preempt() -> DisablePreemptGuard {
     DisablePreemptGuard::new()

framework/aster-frame/src/task/scheduler.rs

@@ -18,8 +18,10 @@ lazy_static! {
 /// An implementation of scheduler can attach scheduler-related information
 /// with the `TypeMap` returned from `task.data()`.
 pub trait Scheduler: Sync + Send {
+    /// Enqueues a task to the scheduler.
     fn enqueue(&self, task: Arc<Task>);
 
+    /// Dequeues a task from the scheduler.
     fn dequeue(&self) -> Option<Arc<Task>>;
 
     /// Tells whether the given task should be preempted by other tasks in the queue.
@@ -61,6 +63,7 @@ pub fn fetch_task() -> Option<Arc<Task>> {
     GLOBAL_SCHEDULER.lock_irq_disabled().dequeue()
 }
 
+/// Adds a task to the global scheduler.
 pub fn add_task(task: Arc<Task>) {
     GLOBAL_SCHEDULER.lock_irq_disabled().enqueue(task);
 }

framework/aster-frame/src/task/task.rs

@@ -1,5 +1,8 @@
 // SPDX-License-Identifier: MPL-2.0
 
+// FIXME: the `intrusive_adapter` macro will generate methods without docs.
+// So we temporary allow missing_docs for this module.
+#![allow(missing_docs)]
 #![allow(dead_code)]
 
 use core::cell::UnsafeCell;
@@ -22,6 +25,7 @@ use crate::{
 
 pub const KERNEL_STACK_SIZE: usize = PAGE_SIZE * 64;
 
+/// Trait for manipulating the task context.
 pub trait TaskContextApi {
     /// Set instruction pointer
     fn set_instruction_pointer(&mut self, ip: usize);
@@ -195,6 +199,7 @@ impl Task {
         unreachable!()
     }
 
+    /// Checks if the task has a real-time priority.
     pub fn is_real_time(&self) -> bool {
         self.priority.is_real_time()
     }
@@ -238,6 +243,7 @@ impl TaskOptions {
         }
     }
 
+    /// Sets the function that represents the entry point of the task.
     pub fn func<F>(mut self, func: F) -> Self
     where
         F: Fn() + Send + Sync + 'static,
@@ -246,6 +252,7 @@ impl TaskOptions {
         self
     }
 
+    /// Sets the data associated with the task.
     pub fn data<T>(mut self, data: T) -> Self
     where
         T: Any + Send + Sync,
@@ -266,6 +273,10 @@ impl TaskOptions {
         self
     }
 
+    /// Sets the CPU affinity mask for the task.
+    ///
+    /// The `cpu_affinity` parameter is an instance of the [`CpuSet`] struct
+    /// that represents the desired set of CPUs to run the task on.
     pub fn cpu_affinity(mut self, cpu_affinity: CpuSet) -> Self {
         self.cpu_affinity = cpu_affinity;
         self

framework/aster-frame/src/trap/irq.rs

@@ -13,12 +13,16 @@ use crate::{
     Error,
 };
 
+/// Type alias for the irq callback function.
 pub type IrqCallbackFunction = dyn Fn(&TrapFrame) + Sync + Send + 'static;
 
-/// An Interrupt ReQuest(IRQ) line. User can use `alloc` or `alloc_specific` to get specific IRQ line.
+/// An Interrupt ReQuest(IRQ) line. User can use [`alloc`] or [`alloc_specific`] to get specific IRQ line.
 ///
 /// The IRQ number is guaranteed to be external IRQ number and user can register callback functions to this IRQ resource.
 /// When this resource is dropped, all the callback in this will be unregistered automatically.
+///
+/// [`alloc`]: Self::alloc
+/// [`alloc_specific`]: Self::alloc_specific
 #[derive(Debug)]
 #[must_use]
 pub struct IrqLine {
@@ -29,6 +33,7 @@ pub struct IrqLine {
 }
 
 impl IrqLine {
+    /// Allocates a specific IRQ line.
     pub fn alloc_specific(irq: u8) -> Result<Self> {
         IRQ_ALLOCATOR
             .get()
@@ -39,6 +44,7 @@ impl IrqLine {
             .ok_or(Error::NotEnoughResources)
     }
 
+    /// Allocates an available IRQ line.
     pub fn alloc() -> Result<Self> {
         let Some(irq_num) = IRQ_ALLOCATOR.get().unwrap().lock().alloc() else {
             return Err(Error::NotEnoughResources);
@@ -71,6 +77,7 @@ impl IrqLine {
         self.callbacks.push(self.irq.on_active(callback))
     }
 
+    /// Checks if there are no registered callbacks.
     pub fn is_empty(&self) -> bool {
         self.callbacks.is_empty()
     }

framework/aster-frame/src/trap/mod.rs

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: MPL-2.0
 
+//! Handle trap across kernel and user space.
+
 mod handler;
 mod irq;
 pub mod softirq;

framework/aster-frame/src/user.rs

@@ -112,6 +112,7 @@ pub struct UserMode<'a> {
 impl<'a> !Send for UserMode<'a> {}
 
 impl<'a> UserMode<'a> {
+    /// Creates a new `UserMode`.
     pub fn new(user_space: &'a Arc<UserSpace>) -> Self {
         Self {
             current: Task::current(),

framework/libs/align_ext/Cargo.toml

@@ -5,4 +5,4 @@ edition = "2021"
 description = " An extension trait for Rust integer types to make integers aligned to a power of two"
 license = "MPL-2.0"
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html