/* Copyright (C) 2004  The SOS Team
    Copyright (C) 1999  Free Software Foundation, Inc.
 
    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_HWSEGS_H_
 #define _SOS_HWSEGS_H_
 
 /**
  * @file segments.h
  *
  * Global and local (GDT/LDT) segment descriptor definition and
  * structure. These segments map virtual addresses (ie
  * data/instruction addresses, relative to these segment descriptors)
  * to linear addresses (ie addresses in the paged-memory space).
  *
  * @see Intel x86 doc, vol 3 chapter 3.
  */
 
 #include <sos/types.h>
 
 /*
  * Global segment selectors (GDT) for SOS/x86.
  *
  * @see gdt.h
  */
 #define SOS_SEG_NULL  0 /* NULL segment, unused by the procesor */
 #define SOS_SEG_KCODE 1 /* Kernel code segment */
 #define SOS_SEG_KDATA 2 /* Kernel data segment */
 
 
 /**
  * Helper macro that builds a segment register's value
  */
 #define SOS_BUILD_SEGMENT_REG_VALUE(desc_privilege,in_ldt,seg_index) \
   (  (((desc_privilege) & 0x3)  << 0) \
    | (((in_ldt)?1:0)            << 2) \
    | ((seg_index)               << 3) )
 
 
 /*
  * Local segment selectors (LDT) for SOS/x86
  */
 /* None */
 
 #endif /* _SOS_HWSEGS_H_ */