That would be the delay on the i386 (sic) architecture. In general,
though, the delay is:
"Some devices require that accesses to their ports are slowed down.
This functionality is provided by appending a _p to the end of the
function."
-- Documentation/DocBook/deviceiobook.tmpl
(I've not seen any other formal definition.)
Most architectures (Alpha, Arm, Arm2, Blackfin, FRV, h8300, IA64,
PA-RISC, PowerPC, Sparc, Sparc64, V850 and Xtensa) do no pause. M68k
does no pause except in one configuration, when it's the same as i386.
On m32r it's a push and a pop. On SuperH it's similar to i386, only
using 16-bit input. X86-64 is the same as i386!
Thinking that _p gives a pause is perhaps too PC-centric. Why, if a
delay is needed, wouldn't you use a real delay; one that says how long
it should be?
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