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001 /* Copyright (C) 2004 David Decotigny 001 /* Copyright (C) 2004 David Decotigny 002 002 003 This program is free software; you can redi 003 This program is free software; you can redistribute it and/or 004 modify it under the terms of the GNU Genera 004 modify it under the terms of the GNU General Public License 005 as published by the Free Software Foundatio 005 as published by the Free Software Foundation; either version 2 006 of the License, or (at your option) any lat 006 of the License, or (at your option) any later version. 007 007 008 This program is distributed in the hope tha 008 This program is distributed in the hope that it will be useful, 009 but WITHOUT ANY WARRANTY; without even the 009 but WITHOUT ANY WARRANTY; without even the implied warranty of 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 011 GNU General Public License for more details 011 GNU General Public License for more details. 012 012 013 You should have received a copy of the GNU 013 You should have received a copy of the GNU General Public License 014 along with this program; if not, write to t 014 along with this program; if not, write to the Free Software 015 Foundation, Inc., 59 Temple Place - Suite 3 015 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 016 USA. 016 USA. 017 */ 017 */ 018 #ifndef _SOS_GDT_H_ 018 #ifndef _SOS_GDT_H_ 019 #define _SOS_GDT_H_ 019 #define _SOS_GDT_H_ 020 020 021 /** 021 /** 022 * @file gdt.h 022 * @file gdt.h 023 * 023 * 024 * The routines that manage the GDT, the table 024 * The routines that manage the GDT, the table that maps the virtual 025 * addresses (data/instructions, segment-relat 025 * addresses (data/instructions, segment-relative), to "linear" 026 * addresses (ie paged-memory). In SOS/x86, we 026 * addresses (ie paged-memory). In SOS/x86, we use a "flat" virtual 027 * space, ie the virtual and linear spaces are 027 * space, ie the virtual and linear spaces are equivalent. 028 * 028 * 029 * @see Intel x86 doc vol 3, chapter 3 029 * @see Intel x86 doc vol 3, chapter 3 030 */ 030 */ 031 031 032 #include <sos/types.h> 032 #include <sos/types.h> 033 #include <sos/errno.h> 033 #include <sos/errno.h> 034 034 035 /** 035 /** 036 * Configure the virtual space as a direct map 036 * Configure the virtual space as a direct mapping to the linear 037 * address space (ie "flat" virtual space). 037 * address space (ie "flat" virtual space). 038 */ 038 */ 039 sos_ret_t sos_gdt_subsystem_setup(void); 039 sos_ret_t sos_gdt_subsystem_setup(void); 040 040 041 041 >> 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 >> 051 042 #endif /* _SOS_GDT_H_ */ 052 #endif /* _SOS_GDT_H_ */
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