Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.

On 17-12-07 19:14, linux-os (Dick Johnson) wrote:

Attached is a patch that changes the outs to ins on port 0x80.

No, that isn't useful. Only a write is "guaranteed" to make ISA/LPC meaningthe timing for a read varies wildly. See the in/out cycles results postedearlier. Was also reading the Intel PIIX(3) chiset datasheet today whichspecifically mentions that only writes flow through to ISA, reads do not.


Rene.
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References:
- [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
  - From: "David P. Reed" <[email protected]>
- Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
  - From: Avi Kivity <[email protected]>
- Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
  - From: "David P. Reed" <[email protected]>
- Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc.
  - From: "linux-os (Dick Johnson)" <[email protected]>

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