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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 << 003 002 004 This program is free software; you can redi 003 This program is free software; you can redistribute it and/or 005 modify it under the terms of the GNU Genera 004 modify it under the terms of the GNU General Public License 006 as published by the Free Software Foundatio 005 as published by the Free Software Foundation; either version 2 007 of the License, or (at your option) any lat 006 of the License, or (at your option) any later version. 008 007 009 This program is distributed in the hope tha 008 This program is distributed in the hope that it will be useful, 010 but WITHOUT ANY WARRANTY; without even the 009 but WITHOUT ANY WARRANTY; without even the implied warranty of 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR 010 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 012 GNU General Public License for more details 011 GNU General Public License for more details. 013 012 014 You should have received a copy of the GNU 013 You should have received a copy of the GNU General Public License 015 along with this program; if not, write to t 014 along with this program; if not, write to the Free Software 016 Foundation, Inc., 59 Temple Place - Suite 3 015 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 017 USA. 016 USA. 018 */ 017 */ 019 #ifndef _SOS_HWSEGS_H_ 018 #ifndef _SOS_HWSEGS_H_ 020 #define _SOS_HWSEGS_H_ 019 #define _SOS_HWSEGS_H_ 021 020 022 /** 021 /** 023 * @file segments.h 022 * @file segments.h 024 * 023 * 025 * Global and local (GDT/LDT) segment descript 024 * Global and local (GDT/LDT) segment descriptor definition and 026 * structure. These segments map virtual addre 025 * structure. These segments map virtual addresses (ie 027 * data/instruction addresses, relative to the 026 * data/instruction addresses, relative to these segment descriptors) 028 * to linear addresses (ie addresses in the pa 027 * to linear addresses (ie addresses in the paged-memory space). 029 * 028 * 030 * @see Intel x86 doc, vol 3 chapter 3. 029 * @see Intel x86 doc, vol 3 chapter 3. 031 */ 030 */ 032 031 033 #include <sos/types.h> << 034 032 035 /* 033 /* 036 * Global segment selectors (GDT) for SOS/x86. 034 * Global segment selectors (GDT) for SOS/x86. 037 * 035 * 038 * @see gdt.h 036 * @see gdt.h 039 */ 037 */ 040 #define SOS_SEG_NULL 0 /* NULL segment, unuse !! 038 #define SOS_SEG_NULL 0 /* NULL segment, unused by the procesor */ 041 #define SOS_SEG_KCODE 1 /* Kernel code segment !! 039 #define SOS_SEG_KCODE 1 /* Kernel code segment */ 042 #define SOS_SEG_KDATA 2 /* Kernel data segment !! 040 #define SOS_SEG_KDATA 2 /* Kernel data segment */ >> 041 #define SOS_SEG_UCODE 3 /* User code segment */ >> 042 #define SOS_SEG_UDATA 4 /* User data segment */ >> 043 #define SOS_SEG_KERNEL_TSS 5 /* Kernel TSS for CPL3 -> CPL0 privilege change */ 043 044 044 045 >> 046 #ifndef ASM_SOURCE 045 /** 047 /** 046 * Helper macro that builds a segment register 048 * Helper macro that builds a segment register's value 047 */ 049 */ 048 #define SOS_BUILD_SEGMENT_REG_VALUE(desc_privi 050 #define SOS_BUILD_SEGMENT_REG_VALUE(desc_privilege,in_ldt,seg_index) \ 049 ( (((desc_privilege) & 0x3) << 0) \ 051 ( (((desc_privilege) & 0x3) << 0) \ 050 | (((in_ldt)?1:0) << 2) \ 052 | (((in_ldt)?1:0) << 2) \ 051 | ((seg_index) << 3) ) 053 | ((seg_index) << 3) ) >> 054 #else >> 055 /* >> 056 * Assembler-compliant version. >> 057 * >> 058 * Caution: In assembler code, "in_ldt" MUST be either 1 or 0, nothing >> 059 * else. >> 060 */ >> 061 #define SOS_BUILD_SEGMENT_REG_VALUE(desc_privilege,in_ldt,seg_index) \ >> 062 ( (((desc_privilege) & 0x3) << 0) \ >> 063 | ((in_ldt & 1) << 2) \ >> 064 | ((seg_index) << 3) ) >> 065 #endif 052 066 053 067 054 /* 068 /* 055 * Local segment selectors (LDT) for SOS/x86 069 * Local segment selectors (LDT) for SOS/x86 056 */ 070 */ 057 /* None */ 071 /* None */ 058 072 059 #endif /* _SOS_HWSEGS_H_ */ 073 #endif /* _SOS_HWSEGS_H_ */
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