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001 /* Copyright (C) 2004 The SOS Team 001 /* Copyright (C) 2004 The SOS Team 002 Copyright (C) 1999 Free Software Foundatio 002 Copyright (C) 1999 Free Software Foundation, Inc. 003 003 004 This program is free software; you can redi 004 This program is free software; you can redistribute it and/or 005 modify it under the terms of the GNU Genera 005 modify it under the terms of the GNU General Public License 006 as published by the Free Software Foundatio 006 as published by the Free Software Foundation; either version 2 007 of the License, or (at your option) any lat 007 of the License, or (at your option) any later version. 008 008 009 This program is distributed in the hope tha 009 This program is distributed in the hope that it will be useful, 010 but WITHOUT ANY WARRANTY; without even the 010 but WITHOUT ANY WARRANTY; without even the implied warranty of 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 012 GNU General Public License for more details 012 GNU General Public License for more details. 013 013 014 You should have received a copy of the GNU 014 You should have received a copy of the GNU General Public License 015 along with this program; if not, write to t 015 along with this program; if not, write to the Free Software 016 Foundation, Inc., 59 Temple Place - Suite 3 016 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 017 USA. 017 USA. 018 */ 018 */ 019 #ifndef _SOS_HWSEGS_H_ 019 #ifndef _SOS_HWSEGS_H_ 020 #define _SOS_HWSEGS_H_ 020 #define _SOS_HWSEGS_H_ 021 021 022 /** 022 /** 023 * @file segments.h 023 * @file segments.h 024 * 024 * 025 * Global and local (GDT/LDT) segment descript 025 * Global and local (GDT/LDT) segment descriptor definition and 026 * structure. These segments map virtual addre 026 * structure. These segments map virtual addresses (ie 027 * data/instruction addresses, relative to the 027 * data/instruction addresses, relative to these segment descriptors) 028 * to linear addresses (ie addresses in the pa 028 * to linear addresses (ie addresses in the paged-memory space). 029 * 029 * 030 * @see Intel x86 doc, vol 3 chapter 3. 030 * @see Intel x86 doc, vol 3 chapter 3. 031 */ 031 */ 032 032 033 #include <sos/types.h> 033 #include <sos/types.h> 034 034 035 /* 035 /* 036 * Global segment selectors (GDT) for SOS/x86. 036 * Global segment selectors (GDT) for SOS/x86. 037 * 037 * 038 * @see gdt.h 038 * @see gdt.h 039 */ 039 */ 040 #define SOS_SEG_NULL 0 /* NULL segment, !! 040 #define SOS_SEG_NULL 0 /* NULL segment, unused by the procesor */ 041 #define SOS_SEG_KCODE 1 /* Kernel code se !! 041 #define SOS_SEG_KCODE 1 /* Kernel code segment */ 042 #define SOS_SEG_KDATA 2 /* Kernel data se !! 042 #define SOS_SEG_KDATA 2 /* Kernel data segment */ 043 043 044 044 045 /** 045 /** 046 * Helper macro that builds a segment register 046 * Helper macro that builds a segment register's value 047 */ 047 */ 048 #define SOS_BUILD_SEGMENT_REG_VALUE(desc_privi 048 #define SOS_BUILD_SEGMENT_REG_VALUE(desc_privilege,in_ldt,seg_index) \ 049 ( (((desc_privilege) & 0x3) << 0) \ 049 ( (((desc_privilege) & 0x3) << 0) \ 050 | (((in_ldt)?1:0) << 2) \ 050 | (((in_ldt)?1:0) << 2) \ 051 | ((seg_index) << 3) ) 051 | ((seg_index) << 3) ) 052 052 053 053 054 /* 054 /* 055 * Local segment selectors (LDT) for SOS/x86 055 * Local segment selectors (LDT) for SOS/x86 056 */ 056 */ 057 /* None */ 057 /* None */ 058 058 059 #endif /* _SOS_HWSEGS_H_ */ 059 #endif /* _SOS_HWSEGS_H_ */
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