Date: Thu, 30 Jan 2020 23:23:02 +0000 From: Rick Macklem <rmacklem@uoguelph.ca> To: "freebsd-current@FreeBSD.org" <freebsd-current@FreeBSD.org> Subject: easy way to work around a lack of a direct map on i386 Message-ID: <YTBPR01MB3374AA25792499A796DB7CAADD040@YTBPR01MB3374.CANPRD01.PROD.OUTLOOK.COM>
index | next in thread | raw e-mail
Hi, The current code for KERN_TLS uses PHYS_TO_DMAP() to access unmapped external pages on m_ext.ext_pgs mbufs. I also need to do this to implement RPC-over-TLS. The problem is that some arches, like i386, don't support PHYS_TO_DMAP(). Since it appears that there will be at most 4 pages on one of these mbufs, my thinking was... - Acquire four pages of kva from the kernel_map during booting. - Then just use pmap_qenter() to fill in the physical page mappings for long enough to copy the data. Does this sound reasonable? Is there a better way? Thanks for your comments, rickhelp
Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?YTBPR01MB3374AA25792499A796DB7CAADD040>