Recursive Index in page tables?

[mark-i-m]

Is it always index 0? Should this be passed in the BootInfo struct?

[phil-opp]

We used to hardcode the index to 511, but this changed with #71. Now we dynamically look for a free level 4 entry. The chosen index is indirectly reported through the recursive_page_table_addr field in the BootInfo:

bootloader/src/bootinfo/mod.rs

Lines 32 to 34 in 90f5b89

	/// The virtual address of the recursively mapped level 4 page table.
	#[cfg(feature = "recursive_page_table")]
	pub recursive_page_table_addr: u64,

It shouldn't be 0, however, because the bootloader maps itself to that slot…

[mark-i-m]

Thanks! I eventually figured that out. Perhaps a "get recursive index" method could be added that just masks out bits 21:12 and returns a PageTableIndex?

[phil-opp]

Sure, I'd be happy to merge a pull request for this.