The LXR Cross Referencer for SOS

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001 /* Copyright (C) 2004  The SOS Team
002 
003    This program is free software; you can redistribute it and/or
004    modify it under the terms of the GNU General Public License
005    as published by the Free Software Foundation; either version 2
006    of the License, or (at your option) any later version.
007    
008    This program is distributed in the hope that it will be useful,
009    but WITHOUT ANY WARRANTY; without even the implied warranty of
010    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
011    GNU General Public License for more details.
012    
013    You should have received a copy of the GNU General Public License
014    along with this program; if not, write to the Free Software
015    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
016    USA. 
017 */
018 #ifndef _SOS_HWSEGS_H_
019 #define _SOS_HWSEGS_H_
020 
021 /**
022  * @file segments.h
023  *
024  * Global and local (GDT/LDT) segment descriptor definition and
025  * structure. These segments map virtual addresses (ie
026  * data/instruction addresses, relative to these segment descriptors)
027  * to linear addresses (ie addresses in the paged-memory space).
028  *
029  * @see Intel x86 doc, vol 3 chapter 3.
030  */
031 
032 
033 /*
034  * Global segment selectors (GDT) for SOS/x86.
035  *
036  * @see gdt.h
037  */
038 #define SOS_SEG_NULL       0 /* NULL segment, unused by the procesor */
039 #define SOS_SEG_KCODE      1 /* Kernel code segment */
040 #define SOS_SEG_KDATA      2 /* Kernel data segment */
041 
042 
043 #ifndef ASM_SOURCE
044 /**
045  * Helper macro that builds a segment register's value
046  */
047 #define SOS_BUILD_SEGMENT_REG_VALUE(desc_privilege,in_ldt,seg_index) \
048   (  (((desc_privilege) & 0x3)  << 0) \
049    | (((in_ldt)?1:0)            << 2) \
050    | ((seg_index)               << 3) )
051 #else
052 /*
053  * Assembler-compliant version.
054  *
055  * Caution: In assembler code, "in_ldt" MUST be either 1 or 0, nothing
056  * else.
057  */
058 #define SOS_BUILD_SEGMENT_REG_VALUE(desc_privilege,in_ldt,seg_index) \
059   (  (((desc_privilege) & 0x3)  << 0) \
060    | ((in_ldt & 1)              << 2) \
061    | ((seg_index)               << 3) )
062 #endif
063 
064 
065 /*
066  * Local segment selectors (LDT) for SOS/x86
067  */
068 /* None */
069 
070 #endif /* _SOS_HWSEGS_H_ */

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