Method usable_frames

bootloader/kernel/src/memory.rs:67–77

Returns an iterator over the usable frames specified in the memory map.

(&self)

    /// Returns an iterator over the usable frames specified in the memory map.
    fn usable_frames(&self) -> impl Iterator<Item = PhysFrame> {
        // get usable regions from memory map
        let regions = self.memory_map.iter();
        let usable_regions = regions.filter(|r| r.kind == MemoryRegionKind::Usable);
        // map each region to its address range
        let addr_ranges = usable_regions.map(|r| r.start..r.end);
        // transform to an iterator of frame start addresses
        let frame_addresses = addr_ranges.flat_map(|r| r.step_by(4096));
        // create `PhysFrame` types from the start addresses
        frame_addresses.map(|addr| PhysFrame::containing_address(PhysAddr::new(addr)))
    }
}

unsafe impl FrameAllocator<Size4KiB> for BootInfoFrameAllocator {