Aucbvax.3181
net.2bsd-bugs
utzoo!decvax!ucbvax!william
Wed Sep 16 22:18:07 1981
Re: moving i/o buffers back into kernel space
The problem with the buffer mapping only applys to
anything which occupies KDSA5 (KISA5) and gets touched
at at clock interrupt pri. If you never use anything
there, you don't need spl's at all. If you must use
it you can save it and restor it in trap(mch.s) at
interrupt time. We almost did that but for fear of permenantly
breaking adb. We have since fixed adb. We also played
with the idea of savingt it in the context of a proc
so you could use it for other things as well.
bill
-----------------------------------------------------------------
gopher://quux.org/ conversion by John Goerzen <
[email protected]>
of
http://communication.ucsd.edu/A-News/
This Usenet Oldnews Archive
article may be copied and distributed freely, provided:
1. There is no money collected for the text(s) of the articles.
2. The following notice remains appended to each copy:
The Usenet Oldnews Archive: Compilation Copyright (C) 1981, 1996
Bruce Jones, Henry Spencer, David Wiseman.
