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Patch for sys/io.h



Hi,

I have appended two patches (one for glibc 2.1, one for glibc 2.2).
I make sys/io.h platform specific, which means we will not install
it on platforms where we don't have ioperm and iopl.
For Alha and Intel I added inb, inw, outb, outw and co. This functions
where missing since we don't include "asm/io.h" any longer.

Here is the ChangeLog:

2000-01-22  Thorsten Kukuk  <kukuk@suse.de>

	* sysdeps/unix/sysv/linux/Makefile(sysdep_headers): Remove sys/io.h.
	* sysdeps/unix/sysv/linux/alpha/Makefile: Add sys/io.h.
	* sysdeps/unix/sysv/linux/arm/Makefile: Likewise.
	* sysdeps/unix/sysv/linux/i386/Makefile: Likewise.
	* sysdeps/unix/sysv/linux/sys/io.h: Move from here ...
	* sysdeps/unix/sysv/linux/i386/sys/io.h: ... to here, add inb, outb
	  and other inline functions for port access.
	* sysdeps/unix/sysv/linux/alpha/sys/io.h: Add prototypes for port
	  access functions.

-- 
Thorsten Kukuk       http://www.suse.de/~kukuk/       kukuk@suse.de
SuSE GmbH            Schanzaeckerstr. 10            90443 Nuernberg
Linux is like a Vorlon.  It is incredibly powerful, gives terse,
cryptic answers and has a lot of things going on in the background.
--- glibc-2.1/sysdeps/unix/sysv/linux/Makefile	Fri Dec 10 07:33:26 1999
+++ glibc-2.1/sysdeps/unix/sysv/linux/Makefile	Sat Jan 22 12:36:30 2000
@@ -16,7 +16,7 @@
 sysdep_routines += sysctl clone llseek getresuid getresgid umount umount2
 
 sysdep_headers += sys/mount.h sys/acct.h sys/sysctl.h \
-		  sys/io.h sys/klog.h sys/kdaemon.h \
+		  sys/klog.h sys/kdaemon.h \
 		  sys/user.h sys/procfs.h sys/prctl.h \
 		  sys/kd.h sys/soundcard.h sys/vt.h \
 		  sys/quota.h sys/fsuid.h \
--- glibc-2.1/sysdeps/unix/sysv/linux/alpha/Makefile	Wed Oct 21 17:40:13 1998
+++ glibc-2.1/sysdeps/unix/sysv/linux/alpha/Makefile	Sat Jan 22 12:32:45 2000
@@ -3,7 +3,7 @@
 endif
 
 ifeq ($(subdir),misc)
-sysdep_headers += alpha/ptrace.h alpha/regdef.h
+sysdep_headers += alpha/ptrace.h alpha/regdef.h sys/io.h
 
 sysdep_routines += ieee_get_fp_control ieee_set_fp_control \
 		   sethae ioperm osf_sigprocmask llseek adjtimex
--- glibc-2.1/sysdeps/unix/sysv/linux/arm/Makefile	Thu Jan 13 07:07:01 2000
+++ glibc-2.1/sysdeps/unix/sysv/linux/arm/Makefile	Sat Jan 22 12:32:57 2000
@@ -1,6 +1,6 @@
 ifeq ($(subdir),misc)
 sysdep_routines += setfsgid setfsuid setresgid setresuid ioperm
-sysdep_headers += sys/elf.h
+sysdep_headers += sys/elf.h sys/io.h
 endif
 
 ifeq ($(subdir),signal)
--- glibc-2.1/sysdeps/unix/sysv/linux/i386/Makefile	Fri Dec 10 07:33:26 1999
+++ glibc-2.1/sysdeps/unix/sysv/linux/i386/Makefile	Sat Jan 22 12:32:05 2000
@@ -1,6 +1,6 @@
 ifeq ($(subdir),misc)
 sysdep_routines += ioperm iopl vm86 setfsgid setfsuid setresgid setresuid
-sysdep_headers += sys/elf.h sys/perm.h sys/reg.h sys/vm86.h sys/debugreg.h
+sysdep_headers += sys/elf.h sys/perm.h sys/reg.h sys/vm86.h sys/debugreg.h sys/io.h
 endif
 
 ifeq ($(subdir),elf)
--- glibc-2.1/sysdeps/unix/sysv/linux/i386/sys/io.h	Thu Jan  1 01:00:00 1970
+++ glibc-2.1/sysdeps/unix/sysv/linux/i386/sys/io.h	Sat Jan 22 13:14:27 2000
@@ -0,0 +1,178 @@
+/* Copyright (C) 1996, 2000 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#ifndef	_SYS_IO_H
+#define	_SYS_IO_H	1
+
+#include <features.h>
+
+__BEGIN_DECLS
+
+/* If TURN_ON is TRUE, request for permission to do direct i/o on the
+   port numbers in the range [FROM,FROM+NUM-1].  Otherwise, turn I/O
+   permission off for that range.  This call requires root privileges.
+
+   Portability note: not all Linux platforms support this call.  Most
+   platforms based on the PC I/O architecture probably will, however.
+   E.g., Linux/Alpha for Alpha PCs supports this.  */
+extern int ioperm __P ((unsigned long int __from, unsigned long int __num,
+			int __turn_on));
+
+/* Set the I/O privilege level to LEVEL.  If LEVEL>3, permission to
+   access any I/O port is granted.  This call requires root
+   privileges. */
+extern int iopl __P ((int __level));
+
+
+extern inline unsigned char
+inb (unsigned short port)
+{
+  unsigned char _v;
+
+  __asm__ __volatile__ ("inb %w1,%0":"=a" (_v):"Nd" (port));
+  return _v;
+}
+
+extern inline unsigned char
+inb_p (unsigned short port)
+{
+  unsigned char _v;
+
+  __asm__ __volatile__ ("inb %w1,%0\noutb %%al,$0x80":"=a" (_v):"Nd" (port));
+  return _v;
+}
+
+extern inline unsigned short
+inw (unsigned short port)
+{
+  unsigned short _v;
+
+  __asm__ __volatile__ ("inw %w1,%0":"=a" (_v):"Nd" (port));
+  return _v;
+}
+
+extern inline unsigned short
+inw_p (unsigned short port)
+{
+  unsigned short _v;
+
+  __asm__ __volatile__ ("inw %w1,%0\noutb %%al,$0x80":"=a" (_v):"Nd" (port));
+  return _v;
+}
+
+extern inline unsigned int
+inl (unsigned short port)
+{
+  unsigned int _v;
+
+  __asm__ __volatile__ ("inl %w1,%0":"=a" (_v):"Nd" (port));
+  return _v;
+}
+
+extern inline unsigned int
+inl_p (unsigned short port)
+{
+  unsigned int _v;
+  __asm__ __volatile__ ("inl %w1,%0\noutb %%al,$0x80":"=a" (_v):"Nd" (port));
+  return _v;
+}
+
+extern inline void
+outb (unsigned char value, unsigned short port)
+{
+  __asm__ __volatile__ ("outb %b0,%w1"::"a" (value), "Nd" (port));
+}
+
+extern inline void
+outb_p (unsigned char value, unsigned short port)
+{
+  __asm__ __volatile__ ("outb %b0,%w1\noutb %%al,$0x80"::"a" (value),
+			"Nd" (port));
+}
+
+extern inline void
+outw (unsigned short value, unsigned short port)
+{
+  __asm__ __volatile__ ("outw %w0,%w1"::"a" (value), "Nd" (port));
+
+}
+
+extern inline void
+outw_p (unsigned short value, unsigned short port)
+{
+  __asm__ __volatile__ ("outw %w0,%w1\noutb %%al,$0x80"::"a" (value),
+			"Nd" (port));
+}
+
+extern inline void
+outl (unsigned int value, unsigned short port)
+{
+  __asm__ __volatile__ ("outl %0,%w1"::"a" (value), "Nd" (port));
+}
+
+extern inline void
+outl_p (unsigned int value, unsigned short port)
+{
+  __asm__ __volatile__ ("outl %0,%w1\noutb %%al,$0x80"::"a" (value),
+			"Nd" (port));
+}
+
+extern inline void
+insb (unsigned short port, void *addr, unsigned long count)
+{
+  __asm__ __volatile__ ("cld ; rep ; insb":"=D" (addr),
+			"=c" (count):"d" (port), "0" (addr), "1" (count));
+}
+
+extern inline void
+insw (unsigned short port, void *addr, unsigned long count)
+{
+  __asm__ __volatile__ ("cld ; rep ; insw":"=D" (addr),
+			"=c" (count):"d" (port), "0" (addr), "1" (count));
+}
+
+extern inline void
+insl (unsigned short port, void *addr, unsigned long count)
+{
+  __asm__ __volatile__ ("cld ; rep ; insl":"=D" (addr),
+			"=c" (count):"d" (port), "0" (addr), "1" (count));
+}
+
+extern inline void
+outsb (unsigned short port, const void *addr, unsigned long count)
+{
+  __asm__ __volatile__ ("cld ; rep ; outsb":"=S" (addr),
+			"=c" (count):"d" (port), "0" (addr), "1" (count));
+}
+
+extern inline void
+outsw (unsigned short port, const void *addr, unsigned long count)
+{
+  __asm__ __volatile__ ("cld ; rep ; outsw":"=S" (addr),
+			"=c" (count):"d" (port), "0" (addr), "1" (count));
+}
+
+extern inline void
+outsl (unsigned short port, const void *addr, unsigned long count)
+{
+  __asm__ __volatile__ ("cld ; rep ; outsl":"=S" (addr),
+			"=c" (count):"d" (port), "0" (addr), "1" (count));
+}
+
+__END_DECLS
+#endif /* _SYS_IO_H */
--- glibc-2.1/sysdeps/unix/sysv/linux/sys/io.h	Wed Jan  5 23:05:40 2000
+++ glibc-2.1/sysdeps/unix/sysv/linux/sys/io.h	Thu Jan  1 01:00:00 1970
@@ -1,43 +0,0 @@
-/* Copyright (C) 1996 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Library General Public License as
-   published by the Free Software Foundation; either version 2 of the
-   License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Library General Public License for more details.
-
-   You should have received a copy of the GNU Library General Public
-   License along with the GNU C Library; see the file COPYING.LIB.  If not,
-   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-   Boston, MA 02111-1307, USA.  */
-
-#ifndef	_SYS_IO_H
-
-#define	_SYS_IO_H	1
-#include <features.h>
-
-__BEGIN_DECLS
-
-/* If TURN_ON is TRUE, request for permission to do direct i/o on the
-   port numbers in the range [FROM,FROM+NUM-1].  Otherwise, turn I/O
-   permission off for that range.  This call requires root privileges.
-
-   Portability note: not all Linux platforms support this call.  Most
-   platforms based on the PC I/O architecture probably will, however.
-   E.g., Linux/Alpha for Alpha PCs supports this.  */
-extern int ioperm __P ((unsigned long int __from, unsigned long int __num,
-			int __turn_on));
-
-/* Set the I/O privilege level to LEVEL.  If LEVEL>3, permission to
-   access any I/O port is granted.  This call requires root
-   privileges. */
-extern int iopl __P ((int __level));
-
-__END_DECLS
-
-#endif /* _SYS_IO_H */
--- glibc-2.1/sysdeps/unix/sysv/linux/alpha/sys/io.h	Wed Jan  5 23:05:40 2000
+++ glibc-2.1/sysdeps/unix/sysv/linux/alpha/sys/io.h	Sat Jan 22 13:51:26 2000
@@ -17,8 +17,8 @@
    Boston, MA 02111-1307, USA.  */
 
 #ifndef	_SYS_IO_H
-
 #define	_SYS_IO_H	1
+
 #include <features.h>
 
 __BEGIN_DECLS
@@ -63,6 +63,13 @@
 				 unsigned long int __off,
 				 unsigned long int __len,
 				 unsigned char *__buf));
+/* Userspace declarations.  */
+extern unsigned int inb __P ((unsigned long __port));
+extern unsigned int inw __P ((unsigned long __port));
+extern unsigned int inl __P ((unsigned long __port));
+extern void outb __P ((unsigned char __b, unsigned long __port));
+extern void outw __P ((unsigned short __w, unsigned long __port));
+extern void outl __P ((unsigned int __l, unsigned long __port));
 
 __END_DECLS
 
--- glibc-2.2/sysdeps/unix/sysv/linux/Makefile	Fri Dec 10 07:31:48 1999
+++ glibc-2.2/sysdeps/unix/sysv/linux/Makefile	Sat Jan 22 13:23:09 2000
@@ -16,7 +16,7 @@
 sysdep_routines += sysctl clone llseek getresuid getresgid umount umount2
 
 sysdep_headers += sys/mount.h sys/acct.h sys/sysctl.h \
-		  sys/io.h sys/klog.h sys/kdaemon.h \
+		  sys/klog.h sys/kdaemon.h \
 		  sys/user.h sys/procfs.h sys/prctl.h \
 		  sys/kd.h sys/soundcard.h sys/vt.h \
 		  sys/quota.h sys/fsuid.h \
--- glibc-2.2/sysdeps/unix/sysv/linux/alpha/Makefile	Wed Oct 21 17:40:13 1998
+++ glibc-2.2/sysdeps/unix/sysv/linux/alpha/Makefile	Sat Jan 22 13:23:09 2000
@@ -3,7 +3,7 @@
 endif
 
 ifeq ($(subdir),misc)
-sysdep_headers += alpha/ptrace.h alpha/regdef.h
+sysdep_headers += alpha/ptrace.h alpha/regdef.h sys/io.h
 
 sysdep_routines += ieee_get_fp_control ieee_set_fp_control \
 		   sethae ioperm osf_sigprocmask llseek adjtimex
--- glibc-2.2/sysdeps/unix/sysv/linux/arm/Makefile	Thu Jan 13 07:01:52 2000
+++ glibc-2.2/sysdeps/unix/sysv/linux/arm/Makefile	Sat Jan 22 13:23:09 2000
@@ -1,6 +1,6 @@
 ifeq ($(subdir),misc)
 sysdep_routines += setfsgid setfsuid setresgid setresuid ioperm
-sysdep_headers += sys/elf.h
+sysdep_headers += sys/elf.h sys/io.h
 endif
 
 ifeq ($(subdir),signal)
--- glibc-2.2/sysdeps/unix/sysv/linux/i386/Makefile	Fri Dec 10 07:31:49 1999
+++ glibc-2.2/sysdeps/unix/sysv/linux/i386/Makefile	Sat Jan 22 13:23:09 2000
@@ -1,6 +1,6 @@
 ifeq ($(subdir),misc)
 sysdep_routines += ioperm iopl vm86 setfsgid setfsuid setresgid setresuid
-sysdep_headers += sys/elf.h sys/perm.h sys/reg.h sys/vm86.h sys/debugreg.h
+sysdep_headers += sys/elf.h sys/perm.h sys/reg.h sys/vm86.h sys/debugreg.h sys/io.h
 endif
 
 ifeq ($(subdir),elf)
--- glibc-2.2/sysdeps/unix/sysv/linux/i386/sys/io.h	Thu Jan  1 01:00:00 1970
+++ glibc-2.2/sysdeps/unix/sysv/linux/i386/sys/io.h	Sat Jan 22 13:27:51 2000
@@ -0,0 +1,178 @@
+/* Copyright (C) 1996, 2000 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#ifndef	_SYS_IO_H
+#define	_SYS_IO_H	1
+
+#include <features.h>
+
+__BEGIN_DECLS
+
+/* If TURN_ON is TRUE, request for permission to do direct i/o on the
+   port numbers in the range [FROM,FROM+NUM-1].  Otherwise, turn I/O
+   permission off for that range.  This call requires root privileges.
+
+   Portability note: not all Linux platforms support this call.  Most
+   platforms based on the PC I/O architecture probably will, however.
+   E.g., Linux/Alpha for Alpha PCs supports this.  */
+extern int ioperm (unsigned long int __from, unsigned long int __num,
+                   int __turn_on) __THROW;
+
+/* Set the I/O privilege level to LEVEL.  If LEVEL>3, permission to
+   access any I/O port is granted.  This call requires root
+   privileges. */
+extern int iopl (int __level) __THROW;
+
+
+extern inline unsigned char
+inb (unsigned short port)
+{
+  unsigned char _v;
+
+  __asm__ __volatile__ ("inb %w1,%0":"=a" (_v):"Nd" (port));
+  return _v;
+}
+
+extern inline unsigned char
+inb_p (unsigned short port)
+{
+  unsigned char _v;
+
+  __asm__ __volatile__ ("inb %w1,%0\noutb %%al,$0x80":"=a" (_v):"Nd" (port));
+  return _v;
+}
+
+extern inline unsigned short
+inw (unsigned short port)
+{
+  unsigned short _v;
+
+  __asm__ __volatile__ ("inw %w1,%0":"=a" (_v):"Nd" (port));
+  return _v;
+}
+
+extern inline unsigned short
+inw_p (unsigned short port)
+{
+  unsigned short _v;
+
+  __asm__ __volatile__ ("inw %w1,%0\noutb %%al,$0x80":"=a" (_v):"Nd" (port));
+  return _v;
+}
+
+extern inline unsigned int
+inl (unsigned short port)
+{
+  unsigned int _v;
+
+  __asm__ __volatile__ ("inl %w1,%0":"=a" (_v):"Nd" (port));
+  return _v;
+}
+
+extern inline unsigned int
+inl_p (unsigned short port)
+{
+  unsigned int _v;
+  __asm__ __volatile__ ("inl %w1,%0\noutb %%al,$0x80":"=a" (_v):"Nd" (port));
+  return _v;
+}
+
+extern inline void
+outb (unsigned char value, unsigned short port)
+{
+  __asm__ __volatile__ ("outb %b0,%w1"::"a" (value), "Nd" (port));
+}
+
+extern inline void
+outb_p (unsigned char value, unsigned short port)
+{
+  __asm__ __volatile__ ("outb %b0,%w1\noutb %%al,$0x80"::"a" (value),
+			"Nd" (port));
+}
+
+extern inline void
+outw (unsigned short value, unsigned short port)
+{
+  __asm__ __volatile__ ("outw %w0,%w1"::"a" (value), "Nd" (port));
+
+}
+
+extern inline void
+outw_p (unsigned short value, unsigned short port)
+{
+  __asm__ __volatile__ ("outw %w0,%w1\noutb %%al,$0x80"::"a" (value),
+			"Nd" (port));
+}
+
+extern inline void
+outl (unsigned int value, unsigned short port)
+{
+  __asm__ __volatile__ ("outl %0,%w1"::"a" (value), "Nd" (port));
+}
+
+extern inline void
+outl_p (unsigned int value, unsigned short port)
+{
+  __asm__ __volatile__ ("outl %0,%w1\noutb %%al,$0x80"::"a" (value),
+			"Nd" (port));
+}
+
+extern inline void
+insb (unsigned short port, void *addr, unsigned long count)
+{
+  __asm__ __volatile__ ("cld ; rep ; insb":"=D" (addr),
+			"=c" (count):"d" (port), "0" (addr), "1" (count));
+}
+
+extern inline void
+insw (unsigned short port, void *addr, unsigned long count)
+{
+  __asm__ __volatile__ ("cld ; rep ; insw":"=D" (addr),
+			"=c" (count):"d" (port), "0" (addr), "1" (count));
+}
+
+extern inline void
+insl (unsigned short port, void *addr, unsigned long count)
+{
+  __asm__ __volatile__ ("cld ; rep ; insl":"=D" (addr),
+			"=c" (count):"d" (port), "0" (addr), "1" (count));
+}
+
+extern inline void
+outsb (unsigned short port, const void *addr, unsigned long count)
+{
+  __asm__ __volatile__ ("cld ; rep ; outsb":"=S" (addr),
+			"=c" (count):"d" (port), "0" (addr), "1" (count));
+}
+
+extern inline void
+outsw (unsigned short port, const void *addr, unsigned long count)
+{
+  __asm__ __volatile__ ("cld ; rep ; outsw":"=S" (addr),
+			"=c" (count):"d" (port), "0" (addr), "1" (count));
+}
+
+extern inline void
+outsl (unsigned short port, const void *addr, unsigned long count)
+{
+  __asm__ __volatile__ ("cld ; rep ; outsl":"=S" (addr),
+			"=c" (count):"d" (port), "0" (addr), "1" (count));
+}
+
+__END_DECLS
+#endif /* _SYS_IO_H */
--- glibc-2.2/sysdeps/unix/sysv/linux/sys/io.h	Thu Dec 30 09:07:23 1999
+++ glibc-2.2/sysdeps/unix/sysv/linux/sys/io.h	Thu Jan  1 01:00:00 1970
@@ -1,43 +0,0 @@
-/* Copyright (C) 1996, 1999 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Library General Public License as
-   published by the Free Software Foundation; either version 2 of the
-   License, or (at your option) any later version.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Library General Public License for more details.
-
-   You should have received a copy of the GNU Library General Public
-   License along with the GNU C Library; see the file COPYING.LIB.  If not,
-   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-   Boston, MA 02111-1307, USA.  */
-
-#ifndef	_SYS_IO_H
-
-#define	_SYS_IO_H	1
-#include <features.h>
-
-__BEGIN_DECLS
-
-/* If TURN_ON is TRUE, request for permission to do direct i/o on the
-   port numbers in the range [FROM,FROM+NUM-1].  Otherwise, turn I/O
-   permission off for that range.  This call requires root privileges.
-
-   Portability note: not all Linux platforms support this call.  Most
-   platforms based on the PC I/O architecture probably will, however.
-   E.g., Linux/Alpha for Alpha PCs supports this.  */
-extern int ioperm (unsigned long int __from, unsigned long int __num,
-		   int __turn_on) __THROW;
-
-/* Set the I/O privilege level to LEVEL.  If LEVEL>3, permission to
-   access any I/O port is granted.  This call requires root
-   privileges. */
-extern int iopl (int __level) __THROW;
-
-__END_DECLS
-
-#endif /* _SYS_IO_H */
--- glibc-2.2/sysdeps/unix/sysv/linux/alpha/sys/io.h	Thu Dec 30 09:07:23 1999
+++ glibc-2.2/sysdeps/unix/sysv/linux/alpha/sys/io.h	Sat Jan 22 13:40:20 2000
@@ -64,6 +64,14 @@
 			    unsigned long int __len,
 			    unsigned char *__buf) __THROW;
 
+/* Userspace declarations.  */
+extern unsigned int inb (unsigned long __port) __THROW;
+extern unsigned int inw (unsigned long __port) __THROW;
+extern unsigned int inl (unsigned long __port) __THROW;
+extern void outb (unsigned char __b, unsigned long __port) __THROW;
+extern void outw (unsigned short __w, unsigned long __port) __THROW;
+extern void outl (unsigned int __l, unsigned long __port) __THROW;
+
 __END_DECLS
 
 #endif /* _SYS_IO_H */

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