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The LXR Cross Referencer for SOS

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001 /* Copyright (C) 2004  David Decotigny
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_GDT_H_
019 #define _SOS_GDT_H_
020 
021 /**
022  * @file gdt.h
023  *
024  * The routines that manage the GDT, the table that maps the virtual
025  * addresses (data/instructions, segment-relative), to "linear"
026  * addresses (ie paged-memory). In SOS/x86, we use a "flat" virtual
027  * space, ie the virtual and linear spaces are equivalent.
028  *
029  * @see Intel x86 doc vol 3, chapter 3
030  */
031 
032 #include <sos/types.h>
033 #include <sos/errno.h>
034 
035 /**
036  * Configure the virtual space as a direct mapping to the linear
037  * address space (ie "flat" virtual space).
038  */
039 sos_ret_t sos_gdt_subsystem_setup(void);
040 
041 
042 /**
043  * Register the given address as the kernel TSS (for cpl3 -> cpl0
044  * privilege changes). Assumes that this address corresponds to a
045  * valid TSS.
046  *
047  * @note Internal function called only by the cpu_context subsystem.
048  */
049 sos_ret_t sos_gdt_register_kernel_tss(sos_vaddr_t tss_vaddr);
050 
051 
052 #endif /* _SOS_GDT_H_ */

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