[516] in Humor
HUMOR: You can almost hear the chip singing...
daemon@ATHENA.MIT.EDU (abennett@MIT.EDU)
Thu Oct 27 17:17:22 1994
From: abennett@MIT.EDU
To: humor@MIT.EDU
Date: Thu, 27 Oct 1994 17:13:35 EDT
Date: Thu, 27 Oct 1994 17:08:24 -0400
From: Erik Nygren <nygren@MIT.EDU>
...
Just to lighten your day... From "PowerPC: A Practical Companion":
> Enforce In Order Execution of I/O
>
> eieio -
>
> "This instruction is important when accessing I/O areas or other
> memory addresses where the strict program order must be enforced or
> completed before continuing the program execution. In short, it will
> ensure that all currently outstanding accesses to main memory before
> the execution of the eieio instruction are completed. Any subsequent
> memory accesses that are requested or initiated will be forced to
> wait.
>
> ...
>
> "This opcode simply holds back the program execution to allow all the
> previous memory requests and operations to complete correctly...."
>
You can almost here the chip singing...
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