Date: Tue, 20 Apr 1999 10:48:52 +0100 (BST) From: Doug Rabson <dfr@nlsystems.com> To: Peter Wemm <peter@netplex.com.au> Cc: cvs-committers@freebsd.org, cvs-all@freebsd.org Subject: Re: cvs commit: src/sys/i386/isa isa_compat.c Message-ID: <Pine.BSF.4.05.9904201045510.85882-100000@herring.nlsystems.com> In-Reply-To: <19990420092648.F07421F63@spinner.netplex.com.au>
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On Tue, 20 Apr 1999, Peter Wemm wrote:
> Doug Rabson wrote:
> > On Mon, 19 Apr 1999, Peter Wemm wrote:
> >
> > > peter 1999/04/19 13:31:55 PDT
> > >
> > > Modified files:
> > > sys/i386/isa isa_compat.c
> > > Log:
> > > Always reset the isa hints after releasing the resources after probe,
> > > because the act of doing the release kills the hints(!). A quirk of
> > > the wrapper caused it to reset all the settings, except perhaps for the
> > > memory address. I've tested this with a real SMC 8013EPC - which uses
> > > shared memory addresses - it seems to work OK.
> >
> > I can't think why isa.c resets the hints on release. This should be
> > removed (probably).
>
> I think it's just an overloading of the alloc/release storage.
>
> On allocation:
> switch (type) {
> case SYS_RES_IRQ:
> if (isdefault && id->id_irq[0] >= 0) {
> start = id->id_irq[0]; /* get hint */
> end = id->id_irq[0];
> count = 1;
> }
> if (id)
> rvp = &id->id_irqres[*rid];
> break;
> [..]
> On release:
> switch (type) {
> case SYS_RES_IRQ:
> id->id_irqres[rid] = 0;
> id->id_irq[rid] = -1; /* <<< clear hint here */
> break;
> So, on release, we're clearing the space used by the 'hints'.
>
> I think the following lines should probably go from the release section:
> id->id_irq[rid] = -1;
> id->id_drq[rid] = -1;
> id->id_msize[rid] = 0;
> id->id_maddr[rid] = 0;
> id->id_port[rid] = 0;
> id->id_portsize[rid] = 0;
>
> The other alternative is to store the 'defaults' in a seperate location to
> the place we track the allocated resources. IMHO, that would be better
> so that we can see if a programmable card has chosen something different
> than what was hinted at.
These lines should go from the release. I think if a driver tries to
allocate its own range, it should be able to specify the values to
bus_alloc_resource and have it overwrite the hints:
bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, 0x300, 0x30f, 0x10,
RF_ACTIVE);
This seems nicer than calling isa_set_port(...) and isa_set_portsize(...).
--
Doug Rabson Mail: dfr@nlsystems.com
Nonlinear Systems Ltd. Phone: +44 181 442 9037
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