Messages in this thread | | | Date | Sat, 8 Dec 2007 20:26:31 +0000 | From | Alan Cox <> | Subject | Re: RFC: outb 0x80 in inb_p, outb_p harmful on some modern AMD64 with MCP51 laptops |
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> In any case, my machine does not have an ISA bus. Why should it? It's > a laptop!
Yes it does. The branding spec said "No ISA bus" so it was renamed "LPC" and hidden internally, but its alive and well.
> has already serviced the bus and delivered data! Why put many > microseconds into the bus, locking out other ISA transactions (and PCI > maybe too) with an out to port 80?
Historically processors didn't have a high precision time source so it was the normal way to do it on all PC operating systems
> Some of the code in linux is really nice, really clean, really > well-thought out. Some is ... well, I'm not trolling for a fight.
Like all things, it doesn't always age well 8)
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