53 lines
1.6 KiB
C
53 lines
1.6 KiB
C
/* Copyright (C) 2004 David Decotigny
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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USA.
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*/
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#ifndef _SOS_GDT_H_
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#define _SOS_GDT_H_
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/**
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* @file gdt.h
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*
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* The routines that manage the GDT, the table that maps the virtual
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* addresses (data/instructions, segment-relative), to "linear"
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* addresses (ie paged-memory). In SOS/x86, we use a "flat" virtual
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* space, ie the virtual and linear spaces are equivalent.
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*
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* @see Intel x86 doc vol 3, chapter 3
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*/
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#include <sos/types.h>
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#include <sos/errno.h>
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/**
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* Configure the virtual space as a direct mapping to the linear
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* address space (ie "flat" virtual space).
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*/
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sos_ret_t sos_gdt_subsystem_setup(void);
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/**
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* Register the given address as the kernel TSS (for cpl3 -> cpl0
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* privilege changes). Assumes that this address corresponds to a
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* valid TSS.
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*
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* @note Internal function called only by the cpu_context subsystem.
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*/
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sos_ret_t sos_gdt_register_kernel_tss(sos_vaddr_t tss_vaddr);
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#endif /* _SOS_GDT_H_ */
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