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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

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