Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.

> responds to reads differently than "unused" ports.  In particular, an 
> inb takes 1/2 the elapsed time compared to a read to "known" unused port 
> 0xed - 792 tsc ticks for port 80 compared to about 1450 tsc ticks for 
> port 0xed and other unused ports (tsc at 800 MHz).

Well at least we know where the port is now - thats too fast for an LPC
bus device, so it must be an SMI trap.

Only easy way to find out is to use the debugging event counters and see
how many instruction cycles are issued as part of the 0x80 port. If its
suprisingly high then you've got a firmware bug and can go spank HP.
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• References:
  • Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
    • From: "H. Peter Anvin" <[email protected]>
  • Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
    • From: Pavel Machek <[email protected]>
  • Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
    • From: "H. Peter Anvin" <[email protected]>
  • Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
    • From: Alan Cox <[email protected]>
  • Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
    • From: Paul Rolland <[email protected]>
  • Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
    • From: Rene Herman <[email protected]>
  • Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
    • From: "H. Peter Anvin" <[email protected]>
  • [PATCH] x86: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
    • From: Rene Herman <[email protected]>
  • Re: [PATCH] x86: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
    • From: "H. Peter Anvin" <[email protected]>
  • [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
    • From: Rene Herman <[email protected]>
  • Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
    • From: Ingo Molnar <[email protected]>
  • Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
    • From: Rene Herman <[email protected]>
  • Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
    • From: "H. Peter Anvin" <[email protected]>
  • Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
    • From: Rene Herman <[email protected]>
  • Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
    • From: "H. Peter Anvin" <[email protected]>
  • Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
    • From: Rene Herman <[email protected]>
  • Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
    • From: "H. Peter Anvin" <[email protected]>
  • Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.
    • From: "David P. Reed" <[email protected]>

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