On Sat, Aug 04, 2018 at 08:28:25PM +0100, Warner Losh wrote: > When I looked at it, I'd assumed there would be VA range we'd assign to the > PAs in the EFI table that at the loader and kernel would agree on. The DMAP > does this on x64 and aarch64, but that's not an option for armv7 nor i386.
It is not DMAP. Amd64 works by assumption that ROM BIOS and its memory are located at the physical addresses below 4G. Since kernel is always mapped at upper half of the virtual address space, we hope that identity mapping for RT memory can be established over the user half of the VA. Apparently arm64 makes the same assumption. _______________________________________________ freebsd-current@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-current To unsubscribe, send any mail to "freebsd-current-unsubscr...@freebsd.org"
