| 1 | ;
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| 2 | ; TABLES.ASM -- Protected mode tables
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| 3 | ;
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| 4 | ; Copyright (c) 1991-1999 by Eberhard Mattes
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| 5 | ;
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| 6 | ; This file is part of emx.
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| 7 | ;
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| 8 | ; emx is free software; you can redistribute it and/or modify it
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| 9 | ; under the terms of the GNU General Public License as published by
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| 10 | ; the Free Software Foundation; either version 2, or (at your option)
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| 11 | ; any later version.
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| 12 | ;
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| 13 | ; emx is distributed in the hope that it will be useful,
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| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 16 | ; GNU General Public License for more details.
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| 17 | ;
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| 18 | ; You should have received a copy of the GNU General Public License
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| 19 | ; along with emx; see the file COPYING. If not, write to
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| 20 | ; the Free Software Foundation, 59 Temple Place - Suite 330,
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| 21 | ; Boston, MA 02111-1307, USA.
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| 22 | ;
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| 23 | ; See emx.asm for a special exception.
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| 24 | ;
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| 25 |
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| 26 | ;
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| 27 | ; Global descriptor table
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| 28 | ; Local descriptor tables
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| 29 | ; Task state segment
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| 30 | ;
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| 31 |
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| 32 | __TABLES = 1
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| 33 | INCLUDE EMX.INC
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| 34 | INCLUDE SIGNAL.INC
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| 35 | INCLUDE PROCESS.INC
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| 36 | INCLUDE PMINT.INC
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| 37 | INCLUDE TABLES.INC
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| 38 | INCLUDE HEADERS.INC
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| 39 | INCLUDE EXCEPT.INC
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| 40 | INCLUDE MISC.INC
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| 41 |
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| 42 |
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| 43 | PUBLIC GDT_PTR, GDT_LIN
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| 44 | PUBLIC IDT_PTR, IDT_LIN
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| 45 | PUBLIC REAL_IDT_PTR
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| 46 | PUBLIC GDT, LDTS, IDT, BASE_TABLE
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| 47 | PUBLIC G_VCPI_DESC, G_ENV_DESC, G_PHYS_DESC, G_LIN_MAP_DESC
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| 48 | PUBLIC G_SWAP_BMP_DESC, G_PAGEDIR_DESC, G_VIDEO_DESC
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| 49 | PUBLIC G_PAGE_BMP_DESC, G_TSS_DESC, G_TSS_MEM_DESC
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| 50 | PUBLIC G_TMP1_DESC, G_TMP2_DESC
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| 51 | PUBLIC G_BUF1_DESC, G_BUF2_DESC
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| 52 | PUBLIC TSS_BUSY
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| 53 | PUBLIC TSS_EX8_CR3, TSS_EX10_CR3
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| 54 |
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| 55 | SV_DATA SEGMENT
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| 56 |
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| 57 | GDT_PTR LABEL FWORD
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| 58 | WORD END_GDT - GDT - 1 ; Limit of GDT
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| 59 | GDT_LIN LABEL DWORD
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| 60 | WORD GDT, 0 ; Linear address of GDT
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| 61 |
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| 62 | IDT_PTR LABEL FWORD
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| 63 | WORD END_IDT - IDT - 1 ; Limit of IDT
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| 64 | IDT_LIN LABEL DWORD
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| 65 | WORD IDT, 0 ; Linear address of IDT
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| 66 |
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| 67 | REAL_IDT_PTR LABEL FWORD
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| 68 | WORD 03FFH ; limit of real-mode IDT
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| 69 | DWORD 0 ; Linear address
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| 70 |
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| 71 |
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| 72 | DALIGN 8
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| 73 |
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| 74 | GDT LABEL QWORD
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| 75 | ;
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| 76 | ; The null selector (G_NULL_SEL)
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| 77 | ;
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| 78 | QWORD 0
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| 79 | ;
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| 80 | ; The GDT as memory segment (G_GDT_MEM_SEL)
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| 81 | ;
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| 82 | BTD1 WORD END_GDT-GDT-1 ; Limit (0..15)
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| 83 | WORD GDT ; Base (0..15)
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| 84 | BYTE 0 ; Base (16..23)
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| 85 | BYTE 93H ; Access
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| 86 | BYTE 0 ; Granularity
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| 87 | BYTE 0 ; Base (24..31)
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| 88 | ;
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| 89 | ; The IDT (G_IDT_SEL), not used, but convenient for debugging
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| 90 | ;
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| 91 | QWORD 0
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| 92 | ;
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| 93 | ; Accessing physical memory by physical addresses (G_PHYS_SEL, see note 1)
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| 94 | ;
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| 95 | G_PHYS_DESC WORD 0FFFFH ; Limit (0..15)
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| 96 | WORD 0 ; Base (0..15)
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| 97 | BYTE 0 ; Base (16..23)
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| 98 | BYTE 93H ; Access
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| 99 | BYTE 0CFH ; Granularity
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| 100 | BYTE 0 ; Base (24..31)
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| 101 | ;
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| 102 | ; Supervisor code (G_SV_CODE_SEL)
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| 103 | ;
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| 104 | BTC1 WORD 0FFFFH ; Limit (0..15)
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| 105 | WORD 0 ; Base (0..15)
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| 106 | BYTE 0 ; Base (16..23)
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| 107 | BYTE 9BH ; Access
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| 108 | BYTE 0 ; Granularity
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| 109 | BYTE 0 ; Base (24..31)
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| 110 | ;
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| 111 | ; Used for switch to real mode (G_REAL_SEL)
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| 112 | ;
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| 113 | WORD 0FFFFH ; Limit (0..15)
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| 114 | WORD 0 ; Base (0..15)
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| 115 | BYTE 0 ; Base (16..23)
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| 116 | BYTE 93H ; Access
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| 117 | BYTE 0 ; Granularity
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| 118 | BYTE 0 ; Base (24..31)
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| 119 | ;
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| 120 | ; Initialization/termination code (G_INIT_SEL)
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| 121 | ;
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| 122 | BTI1 WORD 0FFFFH ; Limit (0..15) !!! (return to RM)
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| 123 | WORD 0 ; Base (0..15)
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| 124 | BYTE 0 ; Base (16..23)
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| 125 | BYTE 9BH ; Access
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| 126 | BYTE 0 ; Granularity
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| 127 | BYTE 0 ; Base (24..31)
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| 128 | ;
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| 129 | ; Supervisor data (G_SV_DATA_SEL)
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| 130 | ;
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| 131 | BTD3 WORD 0FFFFH ; Limit (0..15)
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| 132 | WORD 0 ; Base (0..15)
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| 133 | BYTE 0 ; Base (16..23)
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| 134 | BYTE 93H ; Access
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| 135 | BYTE 0 ; Granularity
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| 136 | BYTE 0 ; Base (24..31)
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| 137 | ;
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| 138 | ; Supervisor stack (G_SV_STACK_SEL)
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| 139 | ;
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| 140 | BTS1 WORD OFFSET SV_TOS-1 ; Limit (0..15)
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| 141 | WORD 0 ; Base (0..15)
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| 142 | BYTE 0 ; Base (16..23)
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| 143 | BYTE 93H ; Access
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| 144 | BYTE 40H ; Granularity (see note 2)
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| 145 | BYTE 0 ; Base (24..31)
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| 146 | ;
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| 147 | ; Video memory (G_VIDEO_SEL)
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| 148 | ;
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| 149 | G_VIDEO_DESC WORD 4000 - 1 ; Limit (0..15)
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| 150 | WORD 0 ; Base (0..15)
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| 151 | BYTE 0BH ; Base (16..23)
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| 152 | BYTE 93H ; Access
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| 153 | BYTE 0 ; Granularity
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| 154 | BYTE 0 ; Base (24..31)
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| 155 | ;
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| 156 | ; The TSS (G_TSS_SEL)
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| 157 | ;
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| 158 | G_TSS_DESC WORD END_TSS-TSS-1 ; Limit (0..15)
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| 159 | WORD TSS ; Base (0..15)
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| 160 | BYTE 0 ; Base (16..23)
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| 161 | TSS_BUSY BYTE 89H ; Access
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| 162 | BYTE 0 ; Granularity
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| 163 | BYTE 0 ; Base (24..31)
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| 164 | ;
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| 165 | ; Three segments for VCPI server (G_SERVER_SEL)
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| 166 | ;
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| 167 | G_VCPI_DESC QWORD 3 DUP (0)
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| 168 | ;
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| 169 | ; The DOS environment (G_ENV_SEL)
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| 170 | ;
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| 171 | G_ENV_DESC QWORD 0
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| 172 | ;
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| 173 | ; The HDR_SEG segment (G_HDR_SEL)
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| 174 | ;
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| 175 | BTH1 WORD SIZE BIND_HEADER - 1
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| 176 | WORD 0 ; Base (0..15)
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| 177 | BYTE 0 ; Base (16..23)
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| 178 | BYTE 91H ; Access
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| 179 | BYTE 0 ; Granularity
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| 180 | BYTE 0 ; Base (24..31)
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| 181 | ;
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| 182 | ; Two temporary entries (G_TMP1_SEL, G_TMP2_SEL)
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| 183 | ;
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| 184 | G_TMP1_DESC QWORD 0 ; G_TMP1_SEL
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| 185 | G_TMP2_DESC QWORD 0 ; G_TMP2_SEL
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| 186 | ;
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| 187 | ; Zero based segment (4G bytes) for returning from protected mode
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| 188 | ; to real mode under VCPI (G_ZERO_SEL)
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| 189 | ;
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| 190 | WORD 0FFFFH ; Limit (0..15)
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| 191 | WORD 0 ; Base (0..15)
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| 192 | BYTE 0 ; Base (16..23)
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| 193 | BYTE 93H ; Access
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| 194 | BYTE 0CFH ; Granularity
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| 195 | BYTE 0 ; Base (24..31)
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| 196 | ;
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| 197 | ; 1st communication buffer (G_BUF1_SEL)
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| 198 | ;
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| 199 | G_BUF1_DESC WORD 0FFFFH ; Limit 0..15
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| 200 | WORD 0 ; Base (0..15)
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| 201 | BYTE 0 ; Base (16..23)
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| 202 | BYTE 93H ; Access
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| 203 | BYTE 0 ; Granularity
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| 204 | BYTE 0 ; Base (24..31)
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| 205 | ;
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| 206 | ; 2nd communication buffer (G_BUF2_SEL)
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| 207 | ;
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| 208 | G_BUF2_DESC WORD 0FFFH+OFFSET_1 ; Limit 0..15
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| 209 | WORD 0 ; Base (0..15)
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| 210 | BYTE 0 ; Base (16..23)
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| 211 | BYTE 93H ; Access
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| 212 | BYTE 0 ; Granularity
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| 213 | BYTE 0 ; Base (24..31)
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| 214 | ;
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| 215 | ; The page directory (and swapper info directory, G_PAGEDIR_SEL)
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| 216 | ;
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| 217 | G_PAGEDIR_DESC WORD 2*4096-1 ; Limit 0..15
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| 218 | WORD 0 ; Base (0..15)
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| 219 | BYTE 0 ; Base (16..23)
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| 220 | BYTE 93H ; Access
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| 221 | BYTE 0 ; Granularity
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| 222 | BYTE 0 ; Base (24..31)
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| 223 | ;
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| 224 | ; The swapper file bitmap (G_SWAP_BMP_SEL)
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| 225 | ;
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| 226 | G_SWAP_BMP_DESC QWORD 0
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| 227 | ;
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| 228 | ; The linear address map (G_LIN_MAP_SEL)
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| 229 | ;
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| 230 | G_LIN_MAP_DESC WORD 4096-1 ; Limit 0..15
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| 231 | WORD 0 ; Base (0..15)
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| 232 | BYTE 0 ; Base (16..23)
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| 233 | BYTE 93H ; Access
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| 234 | BYTE 0 ; Granularity
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| 235 | BYTE 0 ; Base (24..31)
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| 236 | ;
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| 237 | ; The free page bitmap (G_PAGE_BMP_SEL)
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| 238 | ;
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| 239 | G_PAGE_BMP_DESC QWORD 0
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| 240 | ;
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| 241 | ; The TSS for exception 8 (double fault, G_TSS_EX8_SEL)
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| 242 | ;
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| 243 | BTD5 WORD END_TSS_EX8 - TSS_EX8 - 1 ; Limit (0..15)
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| 244 | WORD TSS_EX8 ; Base (0..15)
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| 245 | BYTE 0 ; Base (16..23)
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| 246 | BYTE 89H ; Access
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| 247 | BYTE 0 ; Granularity
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| 248 | BYTE 0 ; Base (24..31)
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| 249 | ;
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| 250 | ; The TSS for exception 10 (invalid TSS, G_TSS_EX10_SEL)
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| 251 | ;
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| 252 | BTD6 WORD END_TSS_EX10 - TSS_EX10 - 1 ; Limit (0..15)
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| 253 | WORD TSS_EX10 ; Base (0..15)
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| 254 | BYTE 0 ; Base (16..23)
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| 255 | BYTE 89H ; Access
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| 256 | BYTE 0 ; Granularity
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| 257 | BYTE 0 ; Base (24..31)
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| 258 | ;
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| 259 | ; Stack for exception 8 task (G_EX8_STACK_SEL)
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| 260 | ;
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| 261 | BTS8 WORD OFFSET EX8_TOS-1 ; Limit (0..15)
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| 262 | WORD 0 ; Base (0..15)
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| 263 | BYTE 0 ; Base (16..23)
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| 264 | BYTE 93H ; Access
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| 265 | BYTE 40H ; Granularity
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| 266 | BYTE 0 ; Base (24..31)
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| 267 | ;
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| 268 | ; Stack for exception 10 task (G_EX10_STACK_SEL)
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| 269 | ;
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| 270 | BTS10 WORD OFFSET EX10_TOS-1 ; Limit (0..15)
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| 271 | WORD 0 ; Base (0..15)
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| 272 | BYTE 0 ; Base (16..23)
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| 273 | BYTE 93H ; Access
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| 274 | BYTE 40H ; Granularity
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| 275 | BYTE 0 ; Base (24..31)
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| 276 | ;
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| 277 | ; The TSS as memory segment (G_TSS_MEM_SEL)
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| 278 | ;
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| 279 | G_TSS_MEM_DESC WORD END_TSS-TSS-1 ; Limit (0..15)
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| 280 | WORD TSS ; Base (0..15)
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| 281 | BYTE 0 ; Base (16..23)
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| 282 | BYTE 93H ; Access
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| 283 | BYTE 0 ; Granularity
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| 284 | BYTE 0 ; Base (24..31)
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| 285 | ;
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| 286 | ; The lower 1MB (+64KB)
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| 287 | ;
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| 288 | WORD 010FH ; Limit (0..15)
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| 289 | WORD 0 ; Base (0..15)
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| 290 | BYTE 0 ; Base (16..23)
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| 291 | BYTE 91H ; Access (read only)
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| 292 | BYTE 0C0H ; Granularity
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| 293 | BYTE 0 ; Base (24..31)
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| 294 | ;
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| 295 | ; One LDT per process (G_LDT_SEL, the first entry, is already initialized,
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| 296 | ; because it is used for protected mode startup -- only its existence is
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| 297 | ; required)
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| 298 | ;
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| 299 | BTD8 WORD 8*LDT_ENTRIES-1 ; Limit (0..15)
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| 300 | WORD LDTS ; Base (0..15)
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| 301 | BYTE 0 ; Base (16..23)
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| 302 | BYTE 82H ; Access
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| 303 | BYTE 0 ; Granularity
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| 304 | BYTE 0 ; Base (24..31)
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| 305 |
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| 306 | QWORD (MAX_PROCESSES-1) DUP (0)
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| 307 |
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| 308 | END_GDT LABEL QWORD
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| 309 |
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| 310 |
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| 311 | ;
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| 312 | ; Note 1: When running under VCPI, the base address of the physical
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| 313 | ; memory segment will be changed. See INIT_VCPI for details.
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| 314 | ; The limit will be also changed if not running under VCPI,
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| 315 | ; see INIT_PAGING.
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| 316 | ;
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| 317 | ; Note 2: Setting the B bit is required to make a stack-switch to
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| 318 | ; an inner privilege level load ESP instead of SP from the
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| 319 | ; TSS. With non-zero upper word of ESP the VCPI server doesn't
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| 320 | ; work (tested with CEMM.SYS: crash!).
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| 321 | ;
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| 322 | LDTS QWORD (MAX_PROCESSES * LDT_ENTRIES) DUP (0)
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| 323 |
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| 324 | ;
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| 325 | ; The IDT will be filled in by this program. See RMINT module.
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| 326 | ;
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| 327 | IDT LABEL QWORD
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| 328 | QWORD 256 DUP (?)
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| 329 | END_IDT LABEL QWORD
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| 330 |
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| 331 |
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| 332 | ; This TSS is used only for holding the ring 0 SS:ESP. After
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| 333 | ; switching to protected mode, it is replaced with a dynamically
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| 334 | ; allocated TSS which adds an I/O permission bitmap.
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| 335 | ;
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| 336 | TSS LABEL BYTE
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| 337 | DWORD 0 ; Back pointer
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| 338 | WORD OFFSET SV_TOS, 0 ; STK0
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| 339 | WORD G_SV_STACK_SEL, 0
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| 340 | QWORD 0 ; STK1
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| 341 | QWORD 0 ; STK2
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| 342 | DWORD 0 ; CR3
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| 343 | DWORD 0 ; EIP
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| 344 | DWORD 0 ; EFLAGS
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| 345 | DWORD 0 ; EAX
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| 346 | DWORD 0 ; ECX
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| 347 | DWORD 0 ; EDX
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| 348 | DWORD 0 ; EBX
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| 349 | DWORD 0 ; ESP
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| 350 | DWORD 0 ; EBP
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| 351 | DWORD 0 ; ESI
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| 352 | DWORD 0 ; EDI
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| 353 | DWORD 0 ; ES
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| 354 | DWORD 0 ; CS
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| 355 | DWORD 0 ; SS
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| 356 | DWORD 0 ; DS
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| 357 | DWORD 0 ; FS
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| 358 | DWORD 0 ; GS
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| 359 | DWORD 0 ; LDT
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| 360 | WORD 0 ; DTB
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| 361 | WORD $ + 2 - TSS ; I/O bitmap
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| 362 | BYTE 0FFH ; End of bitmap
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| 363 | END_TSS LABEL BYTE
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| 364 |
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| 365 |
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| 366 | ;
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| 367 | ; This TSS is used for exception 8 (double fault)
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| 368 | ;
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| 369 | TSS_EX8 LABEL BYTE
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| 370 | DWORD 0 ; Back pointer
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| 371 | QWORD 0 ; STK0 (no priv. level chg!)
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| 372 | QWORD 0 ; STK1
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| 373 | QWORD 0 ; STK2
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| 374 | TSS_EX8_CR3 DWORD 0 ; CR3
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| 375 | DWORD OFFSET EXCEPT_TASK ; EIP
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| 376 | DWORD 0 ; EFLAGS
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| 377 | DWORD 8 ; EAX (exception #)
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| 378 | DWORD 0 ; ECX
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| 379 | DWORD 0 ; EDX
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| 380 | DWORD 0 ; EBX
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| 381 | DWORD OFFSET EX8_TOS ; ESP
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| 382 | DWORD 0 ; EBP
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| 383 | DWORD 0 ; ESI
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| 384 | DWORD 0 ; EDI
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| 385 | DWORD G_SV_DATA_SEL ; ES
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| 386 | DWORD G_SV_CODE_SEL ; CS
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| 387 | DWORD G_EX8_STACK_SEL ; SS
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| 388 | DWORD G_SV_DATA_SEL ; DS
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| 389 | DWORD G_SV_DATA_SEL ; FS
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| 390 | DWORD G_SV_DATA_SEL ; GS
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| 391 | DWORD 0 ; LDT
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| 392 | WORD 0 ; DTB
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| 393 | WORD $ + 2 - TSS_EX8 ; I/O bitmap
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| 394 | BYTE 0FFH ; End of bitmap
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| 395 | END_TSS_EX8 LABEL BYTE
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| 396 |
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| 397 |
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| 398 | ;
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| 399 | ; This TSS is used for exception 10 (invalid TSS)
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| 400 | ;
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| 401 | TSS_EX10 LABEL BYTE
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| 402 | DWORD 0 ; Back pointer
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| 403 | QWORD 0 ; STK0 (no priv. level chg!)
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| 404 | QWORD 0 ; STK1
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| 405 | QWORD 0 ; STK2
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| 406 | TSS_EX10_CR3 DWORD 0 ; CR3
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| 407 | DWORD OFFSET EXCEPT_TASK ; EIP
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| 408 | DWORD 0 ; EFLAGS
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| 409 | DWORD 10 ; EAX (exception #)
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| 410 | DWORD 0 ; ECX
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| 411 | DWORD 0 ; EDX
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| 412 | DWORD 0 ; EBX
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| 413 | DWORD OFFSET EX10_TOS ; ESP
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| 414 | DWORD 0 ; EBP
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| 415 | DWORD 0 ; ESI
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| 416 | DWORD 0 ; EDI
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|---|
| 417 | DWORD G_SV_DATA_SEL ; ES
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| 418 | DWORD G_SV_CODE_SEL ; CS
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| 419 | DWORD G_EX10_STACK_SEL ; SS
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| 420 | DWORD G_SV_DATA_SEL ; DS
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| 421 | DWORD G_SV_DATA_SEL ; FS
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| 422 | DWORD G_SV_DATA_SEL ; GS
|
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| 423 | DWORD 0 ; LDT
|
|---|
| 424 | WORD 0 ; DTB
|
|---|
| 425 | WORD $ + 2 - TSS_EX10 ; I/O bitmap
|
|---|
| 426 | BYTE 0FFH ; End of bitmap
|
|---|
| 427 | END_TSS_EX10 LABEL BYTE
|
|---|
| 428 |
|
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| 429 |
|
|---|
| 430 | ;
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|---|
| 431 | ; This table is used for converting segment/offset pairs to linear addresses
|
|---|
| 432 | ; in descriptor tables. The first word of a pair is the real-mode segment,
|
|---|
| 433 | ; the second word points to the descriptor table entry (ASSUME DS:SV_DATA),
|
|---|
| 434 | ; which already contains the offset in the base 0..15 field.
|
|---|
| 435 | ;
|
|---|
| 436 | BASE_TABLE LABEL WORD
|
|---|
| 437 | WORD SV_DATA, BTD1
|
|---|
| 438 | WORD SV_DATA, BTD3
|
|---|
| 439 | WORD SV_DATA, G_TSS_DESC
|
|---|
| 440 | WORD SV_DATA, BTD5
|
|---|
| 441 | WORD SV_DATA, BTD6
|
|---|
| 442 | WORD SV_DATA, G_TSS_MEM_DESC
|
|---|
| 443 | WORD SV_DATA, BTD8
|
|---|
| 444 | WORD SV_STACK, BTS1
|
|---|
| 445 | WORD SV_CODE, BTC1
|
|---|
| 446 | WORD INIT_CODE, BTI1
|
|---|
| 447 | WORD HDR_SEG, BTH1
|
|---|
| 448 | WORD EX8_STACK, BTS8
|
|---|
| 449 | WORD EX10_STACK, BTS10
|
|---|
| 450 | WORD 0, 0 ; End of table
|
|---|
| 451 |
|
|---|
| 452 |
|
|---|
| 453 | SV_DATA ENDS
|
|---|
| 454 |
|
|---|
| 455 |
|
|---|
| 456 | EX8_STACK SEGMENT
|
|---|
| 457 | WORD 256 DUP (?)
|
|---|
| 458 | EX8_TOS LABEL WORD
|
|---|
| 459 | EX8_STACK ENDS
|
|---|
| 460 |
|
|---|
| 461 |
|
|---|
| 462 | EX10_STACK SEGMENT
|
|---|
| 463 | WORD 256 DUP (?)
|
|---|
| 464 | EX10_TOS LABEL WORD
|
|---|
| 465 | EX10_STACK ENDS
|
|---|
| 466 |
|
|---|
| 467 |
|
|---|
| 468 | END
|
|---|
