Merge pull request #123 from rust-osdev/multiboot2-v0.14.2-dev

Multiboot2 v0.14.2 dev

.editorconfig

@@ -9,6 +9,7 @@ insert_final_newline = true
 indent_style = space
 indent_size = 4
 trim_trailing_whitespace = true
+max_line_length = 80
 
 [*.yml]
 indent_size = 2

.github/workflows/qa.yml

@@ -0,0 +1,12 @@
+name: QA
+
+on: [ push, pull_request ]
+
+jobs:
+  spellcheck:
+    name: Spellcheck
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v3
+      # Executes "typos ."
+      - uses: crate-ci/typos@v1.13.20

.github/workflows/rust.yml

@@ -10,6 +10,7 @@ env:
   CARGO_TERM_COLOR: always
 
 jobs:
+  # Regular build (with std) + test execution
   build:
     runs-on: ubuntu-latest
     strategy:
@@ -19,7 +20,7 @@ jobs:
           - nightly
           - 1.52.1 # MSVR
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       # Important preparation step: override the latest default Rust version in GitHub CI
       # with the current value of the iteration in the "strategy.matrix.rust"-array.
       - uses: actions-rs/toolchain@v1
@@ -30,10 +31,11 @@ jobs:
       # helps to identify if the right cargo version is actually used
       - run: cargo version
       - name: Build
-        run: cargo build --verbose
+        run: cargo build --all-targets --verbose
       - name: Run tests
         run: cargo test --verbose
 
+  # no-std build without tests
   build_no_std:
     runs-on: ubuntu-latest
     strategy:
@@ -43,7 +45,7 @@ jobs:
           - nightly
           - 1.52.1 # MSVR
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       # Important preparation step: override the latest default Rust version in GitHub CI
       # with the current value of the iteration in the "strategy.matrix.rust"-array.
       - uses: actions-rs/toolchain@v1
@@ -58,6 +60,26 @@ jobs:
       - name: Build (no_std)
         run: cargo build --target thumbv7em-none-eabihf
 
+  # Tests that the unstable feature, which requires nightly, builds.
+  build_unstable:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - nightly
+    steps:
+      - uses: actions/checkout@v3
+      # Important preparation step: override the latest default Rust version in GitHub CI
+      # with the current value of the iteration in the "strategy.matrix.rust"-array.
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: default
+          toolchain: ${{ matrix.rust }}
+          override: true
+      - name: Build (unstable)
+        run: cargo build --all-targets --features unstable
+      - name: Test (unstable)
+        run: cargo test --all-targets --features unstable
 
   # As discussed, these tasks are optional for PRs.
   style_checks:
@@ -67,7 +89,7 @@ jobs:
         rust:
           - 1.52.1 # MSVR
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       # Important preparation step: override the latest default Rust version in GitHub CI
       # with the current value of the iteration in the "strategy.matrix.rust"-array.
       - uses: actions-rs/toolchain@v1
@@ -80,6 +102,6 @@ jobs:
       - name: Rustfmt
         run: cargo fmt -- --check
       - name: Clippy
-        run: cargo clippy
+        run: cargo clippy --all-targets
       - name: Rustdoc
-        run: cargo doc
+        run: cargo doc --document-private-items

.typos.toml

@@ -0,0 +1,13 @@
+# Configuration for the typos spell checker utility (<https://github.com/crate-ci/typos>).
+
+[files]
+extend-exclude = [
+    # "uefi/src/table/boot.rs"
+]
+
+[default.extend-words]
+Rela = "Rela"
+
+[default.extend-identifiers]
+# FOOBAR = "FOOBAR"
+

Cargo.toml

@@ -1,7 +1,5 @@
 [workspace]
 members = [
-    # Multiboot2 Information Structure (MBI)
     "multiboot2",
-    # Multiboot2 headers
     "multiboot2-header",
 ]

multiboot2-header/src/builder/traits.rs

@@ -23,7 +23,7 @@ pub(crate) trait StructAsBytes: Sized {
     }
 
     /// Returns the structure as a vector of its bytes.
-    /// The length is determined by [`size`].
+    /// The length is determined by [`Self::byte_size`].
     fn struct_as_bytes(&self) -> alloc::vec::Vec<u8> {
         let ptr = self.as_ptr();
         let mut vec = alloc::vec::Vec::with_capacity(self.byte_size());

multiboot2/Cargo.toml

@@ -6,7 +6,7 @@ Multiboot2-compliant bootloaders, like GRUB. It supports all tags from the speci
 including full support for the sections of ELF-64. This library is `no_std` and can be
 used in a Multiboot2-kernel.
 """
-version = "0.14.1"
+version = "0.14.2"
 authors = [
     "Philipp Oppermann <dev@phil-opp.com>",
     "Calvin Lee <cyrus296@gmail.com>",
@@ -31,5 +31,11 @@ homepage = "https://github.com/rust-osdev/multiboot2"
 repository = "https://github.com/rust-osdev/multiboot2"
 documentation = "https://docs.rs/multiboot2"
 
+[features]
+default = []
+# Nightly-only features that will eventually be stabilized.
+unstable = []
+
 [dependencies]
 bitflags = "1"
+derive_more = { version = "0.99.17", default-features = false, features = ["display"] }

multiboot2/Changelog.md

@@ -1,5 +1,12 @@
 # CHANGELOG for crate `multiboot2`
 
+## 0.14.2 (2023-03-17)
+- documentation fixes
+- `MbiLoadError` now implements `Display`
+- Added the `unstable` feature, which enables nightly-only functionality.
+  With this feature, `MbiLoadError` now implements `core::error::Error` and can
+  be used with `anyhow::Result` for example.
+
 ## 0.14.1 (2023-03-09)
 - fixed the calculation of the last area of the memory map tag ([#119](https://github.com/rust-osdev/multiboot2/pull/119))
   (Previously, iterating the EFI Memory map resulted in a superfluous entry as it ran over the next tag)

multiboot2/src/boot_loader_name.rs

@@ -21,10 +21,10 @@ impl BootLoaderNameTag {
     ///
     /// # Examples
     ///
-    /// ```ignore
+    /// ```rust,no_run
+    /// # let boot_info = unsafe { multiboot2::load(0xdeadbeef).unwrap() };
     /// if let Some(tag) = boot_info.boot_loader_name_tag() {
-    ///     let name = tag.name();
-    ///     assert_eq!("GRUB 2.02~beta3-5", name);
+    ///     assert_eq!(Ok("GRUB 2.02~beta3-5"), tag.name());
     /// }
     /// ```
     pub fn name(&self) -> Result<&str, Utf8Error> {

multiboot2/src/command_line.rs

@@ -25,10 +25,11 @@ impl CommandLineTag {
     ///
     /// # Examples
     ///
-    /// ```ignore
+    /// ```rust,no_run
+    /// # let boot_info = unsafe { multiboot2::load(0xdeadbeef).unwrap() };
     /// if let Some(tag) = boot_info.command_line_tag() {
     ///     let command_line = tag.command_line();
-    ///     assert_eq!("/bootarg", command_line);
+    ///     assert_eq!(Ok("/bootarg"), command_line);
     /// }
     /// ```
     pub fn command_line(&self) -> Result<&str, str::Utf8Error> {

multiboot2/src/elf_sections.rs

@@ -33,7 +33,8 @@ impl ElfSectionsTag {
     ///
     /// # Examples
     ///
-    /// ```ignore
+    /// ```rust,no_run
+    /// # let boot_info = unsafe { multiboot2::load(0xdeadbeef).unwrap() };
     /// if let Some(elf_tag) = boot_info.elf_sections_tag() {
     ///     let mut total = 0;
     ///     for section in elf_tag.sections() {

multiboot2/src/lib.rs

@@ -1,13 +1,12 @@
-// this crate can use `std` in tests only
-#![cfg_attr(not(test), no_std)]
+#![no_std]
+#![cfg_attr(feature = "unstable", feature(error_in_core))]
 #![deny(missing_debug_implementations)]
 // --- BEGIN STYLE CHECKS ---
 // These checks are optional in CI for PRs, as discussed in
 // https://github.com/rust-osdev/multiboot2/pull/92
 #![deny(clippy::all)]
 #![deny(rustdoc::all)]
-// Forcing this would be a little bit ridiculous, because it would require code examples for
-// each getter and each trivial trait implementation (like Debug).
+#![allow(rustdoc::private_doc_tests)]
 #![allow(rustdoc::missing_doc_code_examples)]
 // --- END STYLE CHECKS ---
 
@@ -40,6 +39,7 @@
 extern crate std;
 
 use core::fmt;
+use derive_more::Display;
 
 pub use boot_loader_name::BootLoaderNameTag;
 pub use command_line::CommandLineTag;
@@ -88,7 +88,7 @@ pub const MULTIBOOT2_BOOTLOADER_MAGIC: u32 = 0x36d76289;
 
 /// Load the multiboot boot information struct from an address.
 ///
-/// This is the same as `load_with_offset` but the offset is omitted and set
+/// This is the same as [`load_with_offset`] but the offset is omitted and set
 /// to zero.
 ///
 /// ## Example
@@ -108,7 +108,7 @@ pub const MULTIBOOT2_BOOTLOADER_MAGIC: u32 = 0x36d76289;
 ///   environment (segfault) but also in UEFI-applications, where the referenced
 ///   memory is not (identity) mapped (UEFI does only identity mapping).
 /// * The memory at `address` must not be modified after calling `load` or the
-///   program may observe unsychronized mutation.
+///   program may observe unsynchronized mutation.
 pub unsafe fn load(address: usize) -> Result<BootInformation, MbiLoadError> {
     load_with_offset(address, 0)
 }
@@ -117,7 +117,7 @@ pub unsafe fn load(address: usize) -> Result<BootInformation, MbiLoadError> {
 ///
 /// ## Example
 ///
-/// ```ignore
+/// ```rust,no_run
 /// use multiboot2::load_with_offset;
 ///
 /// let ptr = 0xDEADBEEF as *const u32;
@@ -131,7 +131,7 @@ pub unsafe fn load(address: usize) -> Result<BootInformation, MbiLoadError> {
 ///   environment (segfault) but also in UEFI-applications, where the referenced
 ///   memory is not (identity) mapped (UEFI does only identity mapping).
 /// * The memory at `address` must not be modified after calling `load` or the
-///   program may observe unsychronized mutation.
+///   program may observe unsynchronized mutation.
 pub unsafe fn load_with_offset(
     address: usize,
     offset: usize,
@@ -161,19 +161,25 @@ pub unsafe fn load_with_offset(
 
 /// Error type that describes errors while loading/parsing a multiboot2 information structure
 /// from a given address.
-#[derive(Debug)]
+#[derive(Debug, Display)]
 pub enum MbiLoadError {
     /// The address is invalid. Make sure that the address is 8-byte aligned,
     /// according to the spec.
+    #[display(fmt = "The address is invalid")]
     IllegalAddress,
     /// The total size of the multiboot2 information structure must be a multiple of 8.
     /// (Not in spec, but it is implicitly the case, because the begin of MBI
     /// and all tags are 8-byte aligned and the end tag is exactly 8 byte long).
+    #[display(fmt = "The size of the MBI is unexpected")]
     IllegalTotalSize(u32),
     /// End tag missing. Each multiboot2 header requires to have an end tag.
+    #[display(fmt = "There is no end tag")]
     NoEndTag,
 }
 
+#[cfg(feature = "unstable")]
+impl core::error::Error for MbiLoadError {}
+
 /// A Multiboot 2 Boot Information struct.
 pub struct BootInformation {
     inner: *const BootInformationInner,
@@ -197,8 +203,9 @@ impl BootInformation {
     ///
     /// This is the same as doing:
     ///
-    /// ```ignore
-    /// let end_addr = boot_info.start_address() + boot_info.size();
+    /// ```rust,no_run
+    /// # let boot_info = unsafe { multiboot2::load(0xdeadbeef).unwrap() };
+    /// let end_addr = boot_info.start_address() + boot_info.total_size();
     /// ```
     pub fn end_address(&self) -> usize {
         self.start_address() + self.total_size()
@@ -1434,4 +1441,12 @@ mod tests {
             core::mem::transmute::<[u8; 16], EFIMemoryMapTag>([0u8; 16]);
         }
     }
+
+    #[test]
+    #[cfg(feature = "unstable")]
+    /// This test succeeds if it compiles.
+    fn mbi_load_error_implements_error() {
+        fn consumer<E: core::error::Error>(_e: E) {}
+        consumer(MbiLoadError::IllegalAddress)
+    }
 }

multiboot2/src/rsdp.rs

@@ -29,7 +29,7 @@ pub struct RsdpV1Tag {
 }
 
 impl RsdpV1Tag {
-    /// The "RSD PTR " marker singature.
+    /// The "RSD PTR " marker signature.
     ///
     /// This is originally a 8-byte C string (not null terminated!) that must contain "RSD PTR "
     pub fn signature(&self) -> Result<&str, Utf8Error> {

multiboot2/src/vbe_info.rs

@@ -233,7 +233,7 @@ impl fmt::Debug for VBEModeInfo {
 
 /// A VBE colour field.
 ///
-/// Descirbes the size and position of some colour capability.
+/// Describes the size and position of some colour capability.
 #[derive(Debug, PartialEq, Eq, Copy, Clone)]
 #[repr(C, packed)]
 pub struct VBEField {