Date: Sun, 17 Oct 2004 21:46:29 +0200 From: Jan Opacki <opacki@acn.waw.pl> To: Peter Pentchev <roam@ringlet.net> Cc: Giorgos Keramidas <keramida@freebsd.org> Subject: Re: Freebsd assembly programming - IN/OUT commands. Message-ID: <1098042389.372.33.camel@200-ego-4.acn.waw.pl> In-Reply-To: <20041017144610.GB4639@straylight.m.ringlet.net> References: <6.0.1.1.1.20041016135943.0353fb90@adamsatoms.com> <20041017130057.GA1132@gothmog.gr> <20041017144610.GB4639@straylight.m.ringlet.net>
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Hi, Thanks for help. i386_set_ioperm() is exactly what i need. Regards, Jan Opacki On Sun, 2004-10-17 at 16:46, Peter Pentchev wrote: > On Sun, Oct 17, 2004 at 04:00:57PM +0300, Giorgos Keramidas wrote: > > On 2004-10-16 14:03, Jan Opacki <opacki@acn.waw.pl> wrote: > > > I had a short look at your fbd assembly tutorial. I'm have a such > > > problem useing IN, OUT commands. In my case i want to "speak" with cmos > > > by port 70 and 71. We both know that fbsd as same as linux works in safe > > > mode. So we need a permission to use each port. In linux it's a system > > > call sys_ioperm (http://www.die.net/doc/linux/man/man2/ioperm.2.html). > > > How to ask FreeBSD to allow us to use those ports ? And then we could > > > simply do: > > > mov al, 0 > > > out 70h, al > > > nop > > > nop > > > nop > > > nop > > > in al, 71h > > > Do you haveny any idea ? > > > > Look at the io(4) manpage. You need superuser access to work with > > /dev/io and even then your program should be very careful about not > > messing up badly with the hardware, but I think it does what you need. > > Of course, a bit more controlled way (as described in the io(4) manpage, > too), would be to use the i386_set_ioperm(2) syscall :) It is a bit > non-portable, true, but since Jan uses MASM-style assembly and mentions > ports 70h and 71h, I think it would do what he needs. > > G'luck, > Peter
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