pub unsafe fn map<Op: TableOps>(op: &Op, mapping: Mapping)Expand description
Assumption: all are page-aligned
§Safety
This function modifies pages backing a virtual memory range which is inherently unsafe w.r.t. the Rust memory model.
When using this function, please note:
- No locking is performed before touching page table data structures, as such do not use concurrently with any other page table operations
- TLB invalidation is not performed, if previously-mapped ranges are being remapped, TLB invalidation may need to be performed afterwards. Maps a contiguous virtual address range to physical memory.
This function walks the 4-level page table hierarchy (PML4 → PDPT → PD → PT),
allocating intermediate tables as needed via alloc_pte_if_needed, and finally
writing the leaf page table entries with the requested permissions via map_page.
The iterator chain processes each level:
- PML4 (47:39) - allocate PDPT if needed
- PDPT (38:30) - allocate PD if needed
- PD (29:21) - allocate PT if needed
- PT (20:12) - write final PTE with physical address and flags