Struct UsedLevel4Entries

pub struct UsedLevel4Entries { /* private fields */ }

Keeps track of used entries in a level 4 page table.

Useful for determining a free virtual memory block, e.g. for mapping additional data.

Implementations

impl UsedLevel4Entries

pub fn new( max_phys_addr: PhysAddr, regions_len: usize, framebuffer: Option<&RawFrameBufferInfo>, config: &BootloaderConfig, ) -> Self

Initializes a new instance.

Marks the statically configured virtual address ranges from the config as used.

pub fn mark_segments<'a>( &mut self, segments: impl Iterator<Item = ProgramHeader<'a>>, virtual_address_offset: VirtualAddressOffset, )

Marks the virtual address range of all segments as used.

pub fn get_free_entries(&mut self, num: u64) -> PageTableIndex

Returns the first index of a num contiguous unused level 4 entries and marks them as used. If CONFIG.aslr is enabled, this will return random contiguous available entries.

Since this method marks each returned index as used, it can be used multiple times to determine multiple unused virtual memory regions.

pub fn get_free_address(&mut self, size: u64, alignment: u64) -> VirtAddr

Returns a virtual address in one or more unused level 4 entries and marks them as used.

This function calls [get_free_entries] internally, so all of its docs applies here too.