From a8968330aff45e0b8cf278f49fa337d5fcb9bfd8 Mon Sep 17 00:00:00 2001 From: Alex AUVOLAT Date: Fri, 28 Mar 2014 17:09:15 +0100 Subject: Import and compile code for article 6.5 --- sos-code-article6.5/hwcore/ioports.h | 46 ++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 sos-code-article6.5/hwcore/ioports.h (limited to 'sos-code-article6.5/hwcore/ioports.h') diff --git a/sos-code-article6.5/hwcore/ioports.h b/sos-code-article6.5/hwcore/ioports.h new file mode 100644 index 0000000..69c6d15 --- /dev/null +++ b/sos-code-article6.5/hwcore/ioports.h @@ -0,0 +1,46 @@ +/* Copyright (C) 2004 All GPL'ed OS + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License + as published by the Free Software Foundation; either version 2 + of the License, or (at your option) any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, + USA. +*/ +#ifndef _SOS_IOPORTS_H_ +#define _SOS_IOPORTS_H_ + +/** + * @ioports.h + * + * Intel-specific I/O space access routines. + */ + +/* This macro allows to write to an I/O port */ +#define outb(value, port) \ + __asm__ volatile ( \ + "outb %b0,%w1" \ + ::"a" (value),"Nd" (port) \ + ) \ + +// read one byte from port +#define inb(port) \ +({ \ + unsigned char _v; \ + __asm__ volatile ( \ + "inb %w1,%0" \ + :"=a" (_v) \ + :"Nd" (port) \ + ); \ + _v; \ +}) + +#endif /* _SOS_IOPORTS_H_ */ -- cgit v1.2.3