From: Ralf Baechle <ralf@oss.sgi.com>
To: "Maciej W. Rozycki" <macro@ds2.pg.gda.pl>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>,
Wayne Gowcher <wgowcher@yahoo.com>,
Linux-MIPS <linux-mips@oss.sgi.com>
Subject: Re: Equivalent of ioperm / iopl in linux mips ?
Date: Mon, 22 Apr 2002 10:44:17 -0700 [thread overview]
Message-ID: <20020422104417.B10146@dea.linux-mips.net> (raw)
In-Reply-To: <Pine.GSO.3.96.1020422170125.7706H-100000@delta.ds2.pg.gda.pl>; from macro@ds2.pg.gda.pl on Mon, Apr 22, 2002 at 05:30:08PM +0200
On Mon, Apr 22, 2002 at 05:30:08PM +0200, Maciej W. Rozycki wrote:
> Well, for Alpha ioperm/iopl functions check the system type in
> /proc/cpuinfo (we seem to have enough information there as well) and
> failing this they check a result of readlink of /etc/alpha_systype. Then
> an appropriate region of /dev/mem is mmapped with per-page permissions set
> up as requested if ioperm is used (with a worse granularity, though) and
> subsequent in/out function invocations access the area as appropriate.
> See sysdeps/unix/sysv/linux/alpha/ioperm.c in glibc for details -- it's a
> pretty clever solution with good performance and only a few trade-offs.
Thanks for volunteering ;)
Ralf
next prev parent reply other threads:[~2002-04-22 17:43 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-02-21 1:36 set_io_port_base()? Matthew Dharm
2002-02-21 1:57 ` set_io_port_base()? Ralf Baechle
2002-02-21 2:05 ` set_io_port_base()? Matthew Dharm
2002-02-21 2:13 ` set_io_port_base()? Ralf Baechle
2002-02-21 2:27 ` set_io_port_base()? Jun Sun
2002-02-21 2:48 ` set_io_port_base()? Matthew Dharm
2002-02-21 2:48 ` set_io_port_base()? Matthew Dharm
2002-02-21 3:03 ` set_io_port_base()? Jason Gunthorpe
2002-02-21 5:35 ` set_io_port_base()? Jun Sun
2002-02-21 3:30 ` set_io_port_base()? Ralf Baechle
2002-02-21 16:34 ` pthread support in mipsel-linux Wayne Gowcher
2002-02-21 17:55 ` H . J . Lu
2002-02-21 18:12 ` Wayne Gowcher
2002-02-21 18:25 ` H . J . Lu
2002-02-21 18:45 ` Wayne Gowcher
2002-02-22 8:52 ` Florian Lohoff
2002-02-22 13:38 ` Maciej W. Rozycki
2002-02-22 13:45 ` Hiroyuki Machida
2002-02-22 14:28 ` Maciej W. Rozycki
2002-02-22 16:53 ` H . J . Lu
2002-02-22 16:57 ` H . J . Lu
2002-02-22 17:06 ` Maciej W. Rozycki
2002-02-22 17:14 ` H . J . Lu
2002-04-19 17:06 ` Equivalent of ioperm / iopl in linux mips ? Wayne Gowcher
2002-04-20 9:03 ` Geert Uytterhoeven
2002-04-22 11:35 ` Maciej W. Rozycki
2002-04-22 14:55 ` Geert Uytterhoeven
2002-04-22 15:30 ` Maciej W. Rozycki
2002-04-22 15:33 ` Geert Uytterhoeven
2002-04-22 17:44 ` Ralf Baechle [this message]
2002-04-22 18:01 ` Maciej W. Rozycki
2002-02-21 2:08 ` set_io_port_base()? Matthew Dharm
2002-02-21 2:16 ` set_io_port_base()? Ralf Baechle
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