ron minnich wrote:
Very interesting note. We've never seen this before. Comments?
I seem to recall having seen wbinvd among the first few instructions before, along with cli.
//Peter
On 07.11.2013 17:25, Peter Stuge wrote:
ron minnich wrote:
Very interesting note. We've never seen this before. Comments?
I seem to recall having seen wbinvd among the first few instructions before, along with cli.
//Peter
Continue the discussion after reading git log src/cpu/x86/16bit/reset16.inc
So we had it, then we no longer had it. Looks like there was not enough interest to determine the cases when it is needed.
Kyösti
Kyösti Mälkki wrote:
Very interesting note. We've never seen this before. Comments?
I seem to recall having seen wbinvd among the first few instructions before, along with cli.
Continue the discussion after reading git log src/cpu/x86/16bit/reset16.inc
So we had it, then we no longer had it. Looks like there was not enough interest to determine the cases when it is needed.
I'm not surprised.
FWIW I didn't mean just coreboot when saying that I had seen it before.
//Peter
On Thu, Nov 7, 2013 at 7:34 AM, Kyösti Mälkki kyosti.malkki@gmail.com wrote:
So we had it, then we no longer had it. Looks like there was not enough interest to determine the cases when it is needed.
its presence hurt on the p4 (which is when that happened) and its absence never hurt. But from this note, restoring it post-jump would not help; the author is specifically stating that we need it BEFORE the power-on-reset jump.
hmm.
ron
yes, it was there for a very long time. What's interesting about this note is that he is suggesting it needs to be at 0xfffffff0, BEFORE the very first jump. We've never had this need before.
We had it for 5 years in entry16.inc but it was yanked in 2004 as it caused problems.
Interesting.
ron
On Thu, Nov 7, 2013 at 7:25 AM, Peter Stuge peter@stuge.se wrote:
ron minnich wrote:
Very interesting note. We've never seen this before. Comments?
I seem to recall having seen wbinvd among the first few instructions before, along with cli.
//Peter
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Kyösti Mälkki -
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ron minnich