From: David Edelsohn <dje@watson.ibm.com>
To: Gabriel Paubert <paubert@iram.es>
Cc: Benjamin Herrenschmidt <bh40@calva.net>,
Kostas Gewrgiou <gewrgiou@imbc.gr>,
Linux/PowerPC Devel List <linuxppc-dev@lists.linuxppc.org>
Subject: Re: dual head r128
Date: Thu, 12 Oct 2000 12:40:17 -0400 [thread overview]
Message-ID: <200010121640.MAA06292@mal-ach.watson.ibm.com> (raw)
In-Reply-To: Message from Gabriel Paubert <paubert@iram.es> of "Thu, 12 Oct 2000 17:49:22 +0200." <Pine.HPX.4.10.10010121719150.16113-100000@gra-ux1.iram.es>
>>>>> Gabriel Paubert writes:
>> On the kernel side, one of the PCI IO busses will be mapped to ISA. What
>> I'll do is basically to change the kernel inb/outb functions to do
>> something like
>>
>> if (addr < 64k)
>> do_io(isa_io_base + addr)
>> else
>> do_io(addr)
Gabriel> No please, is there anybody bloat-conscious on this damned list ? Burying
Gabriel> more and more code inside each {in,out}[bwl] is not the solution.
Gabriel> Just define a macro ISA_PORT or something like this and update the kernel
Gabriel> to replace all the in/out to fixed ports to do in/out(ISA_PORT(n)). If you
Gabriel> don't do it you'll get a nice panic so you'll find all the places quite
Gabriel> fast.
Yes, it is very important to avoid adding many layers of branches
to the code if anyone cares about performance.
David
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~2000-10-12 16:40 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-10-11 18:17 dual head r128 Josh Huber
2000-10-11 18:43 ` Michel Dänzer
2000-10-11 18:52 ` Josh Huber
2000-10-11 19:04 ` Tom Rini
2000-10-11 19:09 ` Michel Dänzer
2000-10-11 19:26 ` Josh Huber
2000-10-11 22:48 ` Michel Dänzer
2000-10-13 17:16 ` Josh Huber
2000-10-12 13:09 ` Kostas Gewrgiou
2000-10-12 15:13 ` Benjamin Herrenschmidt
2000-10-12 15:49 ` Gabriel Paubert
2000-10-12 16:40 ` David Edelsohn [this message]
2000-10-17 0:12 ` Paul Mackerras
2000-10-17 5:56 ` Michel Lanners
2000-10-17 10:41 ` Benjamin Herrenschmidt
2000-10-17 13:45 ` Geert Uytterhoeven
2000-10-17 17:17 ` Benjamin Herrenschmidt
2000-10-12 16:44 ` Kostas Gewrgiou
2000-10-11 21:01 ` Gabriel Paubert
-- strict thread matches above, loose matches on Subject: below --
2000-10-12 13:41 Hendricks, Kevin
2000-10-12 14:10 ` Kostas Gewrgiou
2000-10-12 14:30 Hendricks, Kevin
2000-10-12 16:11 ` Kostas Gewrgiou
2000-10-12 17:22 ` Michel Dänzer
2000-10-12 17:44 ` Kostas Gewrgiou
2000-10-12 21:25 ` Michel Dänzer
2000-10-13 15:26 ` Kostas Gewrgiou
2000-10-13 16:21 ` Geert Uytterhoeven
2000-10-12 16:25 Hendricks, Kevin
[not found] <200010121619.TAA27476@ns0.imbc.gr>
2000-10-12 17:08 ` Kostas Gewrgiou
[not found] <19340906102959.14429@192.168.1.2>
2000-10-12 17:57 ` Gabriel Paubert
[not found] <Pine.LNX.4.10.10010132302530.381-100000@cassiopeia.home>
2000-10-13 21:36 ` Benjamin Herrenschmidt
2000-10-13 21:47 ` Michel Lanners
2000-10-14 10:13 ` Benjamin Herrenschmidt
2000-10-14 10:21 ` Geert Uytterhoeven
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