Subject: Re: IPL_* and IST_* constants
To: Charles M. Hannum <firstname.lastname@example.org>
From: Chris G Demetriou <Chris_G_Demetriou@UX2.SP.CS.CMU.EDU>
Date: 03/18/1996 08:59:06
> The following specifies a standard that ports using the common ISA and
> EISA code must follow.
Not PCI? it uses them, too...
> The following constants must be defined in <machine/psl.h>, if _KERNEL
> is defined:
How are they brought into scope by drivers? In other words, what
header do _drivers_ include to get them? (Or, if it's a bus-specific
header that drivers include, like isavar.h, what does _it_ include?
If it's psl.h directly, should psl.h be idempotent?)
Some other questions:
(1) how can drivers or busses get strings describing the constants, to
print? Or is this considered unnecessary?
(2) what 'form factor' must the constants fit in? I would assume
'int,' but i'd like to have it written down some place.