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Date: Fri, 19 Dec 1997 13:12:37 -0600
From: Jonathan Lemon <jlemon@americantv.com>
To: Bruce Evans <bde@zeta.org.au>
Cc: hasty@rah.star-gate.com, pb@fasterix.freenix.org, current@FreeBSD.ORG,
        gjp@erols.com, gjp@erols.net
Subject: Re: cvs commit: src/sys/i386/linux linux.h linux_ioctl.c
References: <199712191232.XAA12685@godzilla.zeta.org.au>
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In-Reply-To: <199712191232.XAA12685@godzilla.zeta.org.au>; from Bruce Evans on Dec 12, 1997 at 11:32:20PM +1100
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On Dec 12, 1997 at 11:32:20PM +1100, Bruce Evans wrote:
> That's not what Linux ioperm does.  Linux ioperm sets or clears bits in
> the i/o permissions bitmap.  It is like FreeBSD ioperm except it has a
> cleaner interface and is presumably less buggy.  FreeBSD ioperm is not
> completely implemented.  It is only available if the kernel was configured
> with `options "VM86"'.  It is a subcall of sysarch(undocumented).  You
> have to pass it a pointer to a poorly laid out struct giving the args,
> something like this:
> 
> Linux: int ioperm(u_long from, u_long num, int turn_on);
> FreeBSD: struct i386_ioperm_args { u_short from, num; u_char turn_on; } foo;
>          sysarch(I386_SET_IOPERM, /* XXX 1970's interface */ (char *)&foo);

Heh.  I never claimed to be a wonderful interface designer.  I guess it
comes from working too much with SysV during the daytime.  Would you care
to submit a better interface?  Should it be upgraded to a full system call
instead of a sysarch() call?  
--
Jonathan