https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104688
--- Comment #24 from Alexander Monakov <amonakov at gcc dot gnu.org> --- (In reply to Peter Cordes from comment #23) > But at least on Linux, I don't think there's a way for user-space to even > ask for a page of WT or WP memory (or UC or WC). Only WB memory is easily > available without hacking the kernel. As far as I know, this is true on > other existing OSes. I think it's possible to get UC/WC mappings via a graphics/compute API (e.g. OpenGL, Vulkan, OpenCL, CUDA) on any OS if you get a mapping to device memory (and then CPU vendor cannot guarantee that 128b access won't tear because it might depend on downstream devices).
