Messages in this thread | | | Date | Mon, 17 Dec 2007 14:52:57 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc. |
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Jan Engelhardt wrote: > On Dec 15 2007 17:46, Alan Cox wrote: >>> My understanding is that the linux starts in real mode, and uses the >>> BIOS for such things as reading the very first image. >> Not always. We may enter from 32bit in some cases, and we may also not >> have a PC BIOS in the first place. > > Computers without a PC BIOS (I'm trying to think of something, e.g. > the typical SUN sparc64 box) should have other means of accessing a > clocksource, no?
We were talking about x86 here, though.
Even on x86 we sometimes run from the 32-bit entrypoint.
-hpa
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