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87 lines
2.8 KiB
Rust
87 lines
2.8 KiB
Rust
// SPDX-License-Identifier: MPL-2.0
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//! Providing test utilities and high-level test cases for the frame allocator.
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use core::alloc::Layout;
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use ostd::{
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mm::{frame::GlobalFrameAllocator, FrameAllocOptions, Paddr, Segment, UniqueFrame, PAGE_SIZE},
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prelude::ktest,
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};
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use super::FrameAllocator;
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#[ktest]
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fn frame_allocator_alloc_layout_match() {
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assert_allocation_well_formed(Layout::from_size_align(PAGE_SIZE, PAGE_SIZE).unwrap());
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assert_allocation_well_formed(Layout::from_size_align(PAGE_SIZE * 2, PAGE_SIZE).unwrap());
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assert_allocation_well_formed(Layout::from_size_align(PAGE_SIZE * 3, PAGE_SIZE).unwrap());
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assert_allocation_well_formed(Layout::from_size_align(PAGE_SIZE * 4, PAGE_SIZE).unwrap());
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assert_allocation_well_formed(Layout::from_size_align(PAGE_SIZE * 2, PAGE_SIZE * 2).unwrap());
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assert_allocation_well_formed(Layout::from_size_align(PAGE_SIZE * 4, PAGE_SIZE * 4).unwrap());
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assert_allocation_well_formed(Layout::from_size_align(PAGE_SIZE * 8, PAGE_SIZE * 8).unwrap());
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assert_allocation_well_formed(Layout::from_size_align(PAGE_SIZE * 16, PAGE_SIZE * 16).unwrap());
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}
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#[track_caller]
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fn assert_allocation_well_formed(layout: Layout) {
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let instance = FrameAllocator;
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let allocated = instance.alloc(layout).unwrap();
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assert_eq!(
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allocated % layout.align(),
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0,
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"Allocation alignment mismatch"
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);
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for offset in (0..layout.size()).step_by(PAGE_SIZE) {
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let frame = allocated + offset;
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let frame = UniqueFrame::from_unused(frame, ()).unwrap_or_else(|e| {
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panic!(
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"Metadata not well-formed after allocation at offset {:#x}: {:#?}",
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offset, e
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)
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});
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frame.reset_as_unused();
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}
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instance.add_free_memory(allocated, layout.size());
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}
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/// A mocked memory region for testing.
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///
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/// All the frames in the returned memory region will be marked as used.
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/// When the region is dropped, all the frames will be returned to the global
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/// frame allocator. If any frame is not unused by that time, the drop will panic.
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pub(crate) struct MockMemoryRegion {
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addr: Paddr,
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size: usize,
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}
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impl MockMemoryRegion {
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/// Gets a memory region for testing.
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pub(crate) fn alloc(size: usize) -> Self {
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let seg = FrameAllocOptions::new()
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.alloc_segment(size / PAGE_SIZE)
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.unwrap();
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let addr = seg.start_paddr();
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for frame in seg {
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UniqueFrame::try_from(frame).unwrap().reset_as_unused();
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}
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Self { addr, size }
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}
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/// Gets the start address of the memory region.
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pub(crate) fn start_paddr(&self) -> Paddr {
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self.addr
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}
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}
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impl Drop for MockMemoryRegion {
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fn drop(&mut self) {
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let seg = Segment::from_unused(self.addr..self.addr + self.size, |_| ()).unwrap();
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drop(seg);
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}
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}
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