Re: inb_p and inb

[<cah...@po...>]

On Tue, 24 Dec 2002, Geert Uytterhoeven wrote:
> On Tue, 24 Dec 2002, [iso-8859-2] Krystian Bac=B3awski wrote:
> > On Tue, 24 Dec 2002, Geert Uytterhoeven wrote:
> > > On Tue, 24 Dec 2002, [iso-8859-2] Krystian Bac=B3awski wrote:
> > > > What is the formal difference between inb_p and inb. Does inb_p has=
 a
> > > > special purpose or it's a common alias for inb. I ask because I not=
iced
> > > > that net/8390.c uses inb_p and outb_p where net/apne.c uses inb and=
 outb.=20
> > >=20
> > > The *_p() variants contain some extra delay. This was/is needed on so=
me very
> > > old ISA implementations. Just ignore them for Amiga.
> >=20
> > Can they be replaced by inb/outb in net/8390.c or better leave it alone=
 ?
>=20
> Just leave them in 8390.c. And `#define inb_p inb' etc. in asm/io.h (isn'=
t it
> already done that way?).

Eeergghh... Yes, it is :)
=20
> > BTW. How are ide-interrupts serviced. The beginning is in
> > arch/ppc/amiga/amiints.c, and the end in drivers/ide/gayle.c. What part=
 of
> > kernel should I read ?
>=20
> Euh, what do you want to know? I think those two files contain all you ne=
ed to
> know.

I don't understand what there is gayle_intr_ack for. Hmm... I even don't
understand how exactly interrupts work under linux. I thought that when
gayle interrupt is declared devices list is browsed in order to find
source of interrupt. After that interrupt is redirected to driver
code. I ask because I don't know where to put FastATA registers
switch code, and I try to analyze how exactly gayle's interrupts work, and
how it interacts with code in ide.c, ide-disk.c, ide-probe.c.

Regards
Krystian Baclawski

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