Method usableframes

src/mem.rs:163–177

This returns an iterator over usable frames, as specified by the memory map.

(&self)

	// This returns an iterator over usable frames, as specified by the memory map.
	fn usableframes(&self) -> impl Iterator<Item = PhysFrame>
	{
		// This figures out which regions, from the memory map, are usable.
		let regions = self.memmap.iter();
		let usableregions = regions.filter(|r| r.region_type == MemoryRegionType::Usable);

		// This maps each region to its respective address range.
		let addr_ranges = usableregions.map(|r| r.range.start_addr()..r.range.end_addr());

		// This transforms to an iterator of the frame start addresses.
		let frameaddr = addr_ranges.flat_map(|r| r.step_by(4096));

		// This creates a PhysFrame type from each start address.
		frameaddr.map(|addr| PhysFrame::containing_address(PhysAddr::new(addr)))
	}
}