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Updates per John Kohl (PR#1650).

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This commit is contained in:
pk 1996-01-05 14:56:42 +00:00
parent de0584fa25
commit 7d2e1a8b0b
3 changed files with 37 additions and 3 deletions
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28
lib/libarch/i386/i386_get_ioperm.2
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@ -30,7 +30,7 @@
.\" SUCH DAMAGE.
.\"
.\" from: @(#)fork.2 6.5 (Berkeley) 3/10/91
.\" $Id: i386_get_ioperm.2,v 1.1 1995/10/15 02:29:09 mycroft Exp $
.\" $NetBSD: i386_get_ioperm.2,v 1.2 1996/01/05 14:56:42 pk Exp $
.\"
.Dd October 14, 1995
.Dt I386_GET_IOPERM 2
@ -40,6 +40,7 @@
.Nm i386_set_ioperm
.Nd manage i386 per-process I/O permission bitmap
.Sh SYNOPSIS
.Fd #include <sys/types.h>
.Fd #include <machine/sysarch.h>
.Ft int
.Fn i386_get_ioperm "u_long *iomap"
@ -54,6 +55,20 @@ copies the current I/O permission bitmap into the memory referenced by
sets the I/O permission bitmap from the data pointed to by
.Ar iomap .
This call is restricted to the super-user.
.Pp
The permission bitmap contains
1024
bits in 32 longwords.
If bit
.Va n
is clear in the bitmap, then access is granted to I/O port
.Va n .
If bit
.Va n
is set in the bitmap, then an attempt to access I/O port
.Va n
results in delivery of a SIGBUS signal unless the process's I/O
permission level would grant I/O access.
.Sh RETURN VALUES
Upon successful completion,
.Fn i386_get_ioperm
@ -76,5 +91,16 @@ points outside the process's allocated address space.
.It Bq Er EPERM
The caller was not the super-user.
.El
.Sh BUGS
The bitmap should really cover 65536 bits, but that's just too big for
allocation in a kernel structure. If you need access to ports beyond
1024,
use
.Xr i386_iopl 2 .
.Sh SEE ALSO
.Xr i386_iopl 2
.Sh REFERENCES
i386 Microprocessor Programmer's Reference Manual, Intel
.Sh WARNING
You can really hose your machine if you enable user-level I/O and
write to hardware ports without care.

3
lib/libarch/i386/i386_get_ldt.2
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@ -30,7 +30,7 @@
.\" SUCH DAMAGE.
.\"
.\" from: @(#)fork.2 6.5 (Berkeley) 3/10/91
.\" $Id: i386_get_ldt.2,v 1.2 1993/10/09 00:59:10 cgd Exp $
.\" $NetBSD: i386_get_ldt.2,v 1.3 1996/01/05 14:56:44 pk Exp $
.\"
.Dd September 20, 1993
.Dt I386_GET_LDT 2
@ -40,6 +40,7 @@
.Nm i386_set_ldt
.Nd manage i386 per-process Local Descriptor Table entries
.Sh SYNOPSIS
.Fd #include <sys/types.h>
.Fd #include <machine/segments.h>
.Fd #include <machine/sysarch.h>
.Ft int

9
lib/libarch/i386/i386_iopl.2
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@ -30,7 +30,7 @@
.\" SUCH DAMAGE.
.\"
.\" from: @(#)fork.2 6.5 (Berkeley) 3/10/91
.\" $Id: i386_iopl.2,v 1.1 1995/10/15 02:29:11 mycroft Exp $
.\" $NetBSD: i386_iopl.2,v 1.2 1996/01/05 14:56:45 pk Exp $
.\"
.Dd October 14, 1995
.Dt I386_IOPL 2
@ -39,6 +39,7 @@
.Nm i386_iopl
.Nd change the i386 I/O privilege level
.Sh SYNOPSIS
.Fd #include <sys/types.h>
.Fd #include <machine/sysarch.h>
.Ft int
.Fn i386_iopl "int iopl"
@ -62,5 +63,11 @@ will fail if:
.It Bq Er EPERM
The caller was not the super-user.
.El
.Sh SEE ALSO
.Xr i386_set_ioperm 2 ,
.Xr i386_get_ioperm 2 .
.Sh REFERENCES
i386 Microprocessor Programmer's Reference Manual, Intel
.Sh WARNING
You can really hose your machine if you enable user-level I/O and
write to hardware ports without care.