[41] | 1 | ; Project name : Assembly Library |
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| 2 | ; Description : Functions for managing display context. |
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| 3 | |
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[376] | 4 | ; |
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[491] | 5 | ; XTIDE Universal BIOS and Associated Tools |
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[526] | 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team. |
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[376] | 7 | ; |
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| 8 | ; This program is free software; you can redistribute it and/or modify |
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| 9 | ; it under the terms of the GNU General Public License as published by |
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| 10 | ; the Free Software Foundation; either version 2 of the License, or |
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| 11 | ; (at your option) any later version. |
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[491] | 12 | ; |
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[376] | 13 | ; This program 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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[491] | 16 | ; GNU General Public License for more details. |
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[376] | 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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[491] | 18 | ; |
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[376] | 19 | |
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[41] | 20 | ; Section containing code |
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| 21 | SECTION .text |
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| 22 | |
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| 23 | ;-------------------------------------------------------------------- |
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| 24 | ; DisplayContext_Initialize |
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| 25 | ; Parameters: |
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| 26 | ; DS: BDA segment (zero) |
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| 27 | ; Returns: |
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| 28 | ; Nothing |
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| 29 | ; Corrupts registers: |
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| 30 | ; AX, DX, DI |
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| 31 | ;-------------------------------------------------------------------- |
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[369] | 32 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 33 | DisplayContext_Initialize: |
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| 34 | mov WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut], DEFAULT_CHARACTER_OUTPUT |
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[44] | 35 | mov BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], SCREEN_BACKGROUND_ATTRIBUTE |
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[407] | 36 | call DisplayCursor_GetDefaultCursorShapeToAX |
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[287] | 37 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCursorShape], ax |
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[101] | 38 | ; Fall to .DetectAndSetDisplaySegment |
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[41] | 39 | |
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| 40 | ;-------------------------------------------------------------------- |
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| 41 | ; .DetectAndSetDisplaySegment |
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| 42 | ; Parameters: |
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| 43 | ; DS: BDA segment (zero) |
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| 44 | ; Returns: |
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| 45 | ; Nothing |
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| 46 | ; Corrupts registers: |
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[50] | 47 | ; AX, DX |
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[41] | 48 | ;-------------------------------------------------------------------- |
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| 49 | .DetectAndSetDisplaySegment: |
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[50] | 50 | mov ax, COLOR_TEXT_SEGMENT |
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[41] | 51 | cmp BYTE [VIDEO_BDA.bMode], MDA_TEXT_MODE |
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[101] | 52 | eCMOVE ah, MONO_TEXT_SEGMENT >> 8 |
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[50] | 53 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2], ax |
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[101] | 54 | ; Fall to .InitializeFlags |
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[50] | 55 | |
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| 56 | ;-------------------------------------------------------------------- |
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| 57 | ; .InitializeFlags |
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| 58 | ; Parameters: |
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| 59 | ; DS: BDA segment (zero) |
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| 60 | ; Returns: |
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| 61 | ; Nothing |
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| 62 | ; Corrupts registers: |
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| 63 | ; AX, DX |
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| 64 | ;-------------------------------------------------------------------- |
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| 65 | .InitializeFlags: |
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| 66 | mov dl, FLG_CONTEXT_ATTRIBUTES |
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| 67 | call CgaSnow_IsCgaPresent |
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[588] | 68 | eCMOVC dl, FLG_CONTEXT_ATTRIBUTES | FLG_CONTEXT_CGA |
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[50] | 69 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], dl |
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[101] | 70 | ; Fall to .InitializeCursor |
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[41] | 71 | |
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[101] | 72 | ;-------------------------------------------------------------------- |
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| 73 | ; .InitializeCursor |
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| 74 | ; Parameters: |
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| 75 | ; DS: BDA segment (zero) |
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| 76 | ; Returns: |
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| 77 | ; Nothing |
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| 78 | ; Corrupts registers: |
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| 79 | ; AX, DX |
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| 80 | ;-------------------------------------------------------------------- |
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| 81 | .InitializeCursor: |
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[115] | 82 | call DisplayCursor_GetHardwareCoordinatesToAX ; Coordinates before init |
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| 83 | call DisplayCursor_SetCoordinatesFromAX ; Cursor to Display Context |
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[101] | 84 | ; Fall to DisplayContext_SynchronizeToHardware |
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[41] | 85 | |
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| 86 | ;-------------------------------------------------------------------- |
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[101] | 87 | ; DisplayContext_SynchronizeToHardware |
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| 88 | ; Parameters: |
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| 89 | ; DS: BDA segment (zero) |
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| 90 | ; Returns: |
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| 91 | ; Nothing |
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| 92 | ; Corrupts registers: |
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| 93 | ; AX, DX |
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| 94 | ;-------------------------------------------------------------------- |
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[369] | 95 | ALIGN DISPLAY_JUMP_ALIGN |
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[101] | 96 | DisplayContext_SynchronizeToHardware: |
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| 97 | call DisplayPage_SynchronizeToHardware |
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| 98 | call DisplayCursor_SynchronizeShapeToHardware |
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| 99 | jmp DisplayCursor_SynchronizeCoordinatesToHardware |
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| 100 | |
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| 101 | |
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| 102 | ;-------------------------------------------------------------------- |
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[41] | 103 | ; DisplayContext_Push |
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[491] | 104 | ; DisplayContext_Pop |
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[41] | 105 | ; Parameters: |
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| 106 | ; Nothing |
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| 107 | ; Returns: |
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| 108 | ; Nothing |
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| 109 | ; Corrupts registers: |
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| 110 | ; AX, DI |
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| 111 | ;-------------------------------------------------------------------- |
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[592] | 112 | %ifdef EXCLUDE_FROM_XUB |
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[491] | 113 | %ifndef MODULE_BOOT_MENU |
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| 114 | %define EXCLUDE |
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| 115 | %endif |
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| 116 | %endif |
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| 117 | |
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[592] | 118 | %ifndef EXCLUDE OR EXCLUDE_FROM_BIOSDRVS |
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[369] | 119 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 120 | DisplayContext_Push: |
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| 121 | mov di, ds ; Backup DS |
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| 122 | LOAD_BDA_SEGMENT_TO ds, ax |
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| 123 | pop ax ; Pop return address |
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| 124 | |
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[194] | 125 | %ifndef CHECK_FOR_UNUSED_ENTRYPOINTS |
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[41] | 126 | %assign i 0 |
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[531] | 127 | %ifdef USE_386 |
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| 128 | %rep DISPLAY_CONTEXT_size / 4 |
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| 129 | push DWORD [VIDEO_BDA.displayContext + i] |
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| 130 | %assign i i+4 |
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| 131 | %endrep |
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| 132 | %else |
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| 133 | %rep DISPLAY_CONTEXT_size / 2 |
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| 134 | push WORD [VIDEO_BDA.displayContext + i] |
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| 135 | %assign i i+2 |
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| 136 | %endrep |
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| 137 | %endif |
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[194] | 138 | %endif |
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[491] | 139 | |
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[41] | 140 | mov ds, di ; Restore DS |
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| 141 | jmp ax |
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| 142 | |
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[491] | 143 | |
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[369] | 144 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 145 | DisplayContext_Pop: |
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| 146 | mov di, ds ; Backup DS |
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| 147 | LOAD_BDA_SEGMENT_TO ds, ax |
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| 148 | pop ax ; Pop return address |
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| 149 | |
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[491] | 150 | %ifndef CHECK_FOR_UNUSED_ENTRYPOINTS |
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[531] | 151 | %ifdef USE_386 |
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| 152 | %assign i DISPLAY_CONTEXT_size-4 |
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| 153 | %rep DISPLAY_CONTEXT_size / 4 |
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| 154 | pop DWORD [VIDEO_BDA.displayContext + i] |
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| 155 | %assign i i-4 |
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| 156 | %endrep |
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| 157 | %else |
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| 158 | %assign i DISPLAY_CONTEXT_size-2 |
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| 159 | %rep DISPLAY_CONTEXT_size / 2 |
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| 160 | pop WORD [VIDEO_BDA.displayContext + i] |
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| 161 | %assign i i-2 |
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| 162 | %endrep |
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| 163 | %endif |
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[194] | 164 | %endif |
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[491] | 165 | |
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[41] | 166 | push ax ; Push return address |
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| 167 | push dx |
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| 168 | call DisplayContext_SynchronizeToHardware |
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| 169 | pop dx |
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| 170 | mov ds, di ; Restore DS |
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| 171 | ret |
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[592] | 172 | %endif ; EXCLUDE OR EXCLUDE_FROM_BIOSDRVS |
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[491] | 173 | %undef EXCLUDE |
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[41] | 174 | |
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[491] | 175 | |
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[41] | 176 | ;-------------------------------------------------------------------- |
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[52] | 177 | ; DisplayContext_PrepareOffScreenBufferInESBXwithLengthInCX |
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[48] | 178 | ; Parameters: |
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[52] | 179 | ; CX: Off screen buffer length in characters |
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| 180 | ; ES:BX: Ptr to off screen buffer |
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[48] | 181 | ; Returns: |
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| 182 | ; Nothing |
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| 183 | ; Corrupts registers: |
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[52] | 184 | ; AX, DI |
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[48] | 185 | ;-------------------------------------------------------------------- |
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[592] | 186 | %ifndef EXCLUDE_FROM_XUB OR EXCLUDE_FROM_BIOSDRVS |
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[369] | 187 | ALIGN DISPLAY_JUMP_ALIGN |
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[52] | 188 | DisplayContext_PrepareOffScreenBufferInESBXwithLengthInCX: |
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[48] | 189 | push ds |
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| 190 | |
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| 191 | LOAD_BDA_SEGMENT_TO ds, di |
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| 192 | xchg ax, bx |
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| 193 | mov bx, es |
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| 194 | call DisplayContext_SetCharacterPointerFromBXAX ; ES:DI now has the pointer |
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| 195 | |
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| 196 | mov bl, ATTRIBUTES_NOT_USED |
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| 197 | mov ax, BUFFER_OUTPUT_WITH_CHAR_ONLY |
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| 198 | call DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL |
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[52] | 199 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam], cx |
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[48] | 200 | |
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| 201 | mov bx, di |
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| 202 | pop ds |
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| 203 | ret |
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[592] | 204 | %endif ; EXCLUDE_FROM_XUB OR EXCLUDE_FROM_BIOSDRVS |
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[48] | 205 | |
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| 206 | |
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| 207 | ;-------------------------------------------------------------------- |
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[41] | 208 | ; DisplayContext_SetCharacterPointerFromBXAX |
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| 209 | ; Parameters: |
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| 210 | ; BX:AX: Ptr to destination for next character to output |
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| 211 | ; DS: BDA segment (zero) |
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| 212 | ; Returns: |
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[48] | 213 | ; ES:DI: Pointer that was in BX:AX |
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[41] | 214 | ; Corrupts registers: |
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| 215 | ; AX |
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| 216 | ;-------------------------------------------------------------------- |
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[592] | 217 | %ifndef EXCLUDE_FROM_XUB OR EXCLUDE_FROM_BIOSDRVS |
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[369] | 218 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 219 | DisplayContext_SetCharacterPointerFromBXAX: |
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| 220 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], ax |
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| 221 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2], bx |
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| 222 | xchg di, ax |
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| 223 | mov es, bx |
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| 224 | ret |
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[133] | 225 | %endif |
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[41] | 226 | |
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| 227 | |
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| 228 | ;-------------------------------------------------------------------- |
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| 229 | ; DisplayContext_GetCharacterPointerToBXAX |
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| 230 | ; Parameters: |
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| 231 | ; DS: BDA segment (zero) |
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| 232 | ; Returns: |
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| 233 | ; BX:AX: Ptr to destination for next character to output |
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| 234 | ; Corrupts registers: |
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| 235 | ; Nothing |
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| 236 | ;-------------------------------------------------------------------- |
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[592] | 237 | %ifndef EXCLUDE_FROM_XUB OR EXCLUDE_FROM_BIOSDRVS |
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[369] | 238 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 239 | DisplayContext_GetCharacterPointerToBXAX: |
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| 240 | mov ax, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition] |
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| 241 | mov bx, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2] |
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| 242 | ret |
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[133] | 243 | %endif |
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[41] | 244 | |
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| 245 | |
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[592] | 246 | %ifdef EXCLUDE_FROM_XUB |
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[491] | 247 | %ifndef MODULE_BOOT_MENU |
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| 248 | %define EXCLUDE |
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| 249 | %endif |
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| 250 | %endif |
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[41] | 251 | ;-------------------------------------------------------------------- |
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[45] | 252 | ; DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL |
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[41] | 253 | ; Parameters: |
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| 254 | ; AX: Offset to character output function |
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[45] | 255 | ; BL: Attribute Flag |
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[41] | 256 | ; DS: BDA segment (zero) |
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| 257 | ; Returns: |
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| 258 | ; Nothing |
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| 259 | ; Corrupts registers: |
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[50] | 260 | ; BL |
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[41] | 261 | ;-------------------------------------------------------------------- |
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[491] | 262 | %ifndef EXCLUDE ; 1 of 3 |
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[369] | 263 | ALIGN DISPLAY_JUMP_ALIGN |
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[45] | 264 | DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL: |
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[50] | 265 | and bl, FLG_CONTEXT_ATTRIBUTES |
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| 266 | and BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], ~FLG_CONTEXT_ATTRIBUTES |
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| 267 | or [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], bl |
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[41] | 268 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut], ax |
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| 269 | ret |
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[491] | 270 | %endif |
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[41] | 271 | |
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[489] | 272 | |
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[41] | 273 | ;-------------------------------------------------------------------- |
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| 274 | ; DisplayContext_SetCharacterAttributeFromAL |
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| 275 | ; Parameters: |
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| 276 | ; AL: Character attribute |
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| 277 | ; DS: BDA segment (zero) |
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| 278 | ; Returns: |
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| 279 | ; Nothing |
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| 280 | ; Corrupts registers: |
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| 281 | ; Nothing |
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| 282 | ;-------------------------------------------------------------------- |
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[491] | 283 | %ifndef EXCLUDE ; 2 of 3 |
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[592] | 284 | %ifndef EXCLUDE_FROM_BIOSDRVS |
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[369] | 285 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 286 | DisplayContext_SetCharacterAttributeFromAL: |
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| 287 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], al |
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| 288 | ret |
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[491] | 289 | %endif |
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[592] | 290 | %endif |
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[41] | 291 | |
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| 292 | |
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| 293 | ;-------------------------------------------------------------------- |
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| 294 | ; DisplayContext_SetCharacterOutputParameterFromAX |
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| 295 | ; Parameters: |
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| 296 | ; AX: Parameter for Character Output function |
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| 297 | ; DS: BDA segment (zero) |
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| 298 | ; Returns: |
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| 299 | ; Nothing |
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| 300 | ; Corrupts registers: |
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| 301 | ; Nothing |
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| 302 | ;-------------------------------------------------------------------- |
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[491] | 303 | %ifndef EXCLUDE ; 3 of 3 |
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[592] | 304 | %ifndef EXCLUDE_FROM_BIOSDRVS |
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[369] | 305 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 306 | DisplayContext_SetCharacterOutputParameterFromAX: |
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| 307 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam], ax |
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| 308 | ret |
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[491] | 309 | %endif |
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[592] | 310 | %endif |
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[491] | 311 | |
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| 312 | %undef EXCLUDE |
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| 313 | |
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| 314 | |
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[41] | 315 | ;-------------------------------------------------------------------- |
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| 316 | ; DisplayContext_GetCharacterOutputParameterToDX |
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| 317 | ; Parameters: |
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| 318 | ; DS: BDA segment (zero) |
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| 319 | ; Returns: |
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| 320 | ; DX: User parameter for Character Output function |
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| 321 | ; Corrupts registers: |
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| 322 | ; Nothing |
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[133] | 323 | ;-------------------------------------------------------------------- |
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[592] | 324 | %ifndef EXCLUDE_FROM_XUB OR EXCLUDE_FROM_XTIDECFG OR EXCLUDE_FROM_BIOSDRVS |
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[369] | 325 | ALIGN DISPLAY_JUMP_ALIGN |
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[181] | 326 | DisplayContext_GetCharacterOutputParameterToDX: |
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| 327 | mov dx, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam] |
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| 328 | ret |
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| 329 | %endif |
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[44] | 330 | |
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| 331 | |
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| 332 | ;-------------------------------------------------------------------- |
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| 333 | ; DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX |
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| 334 | ; Parameters: |
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| 335 | ; AX: Offset in bytes from some character to another |
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| 336 | ; DS: BDA segment (zero) |
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| 337 | ; Returns: |
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| 338 | ; AX: Offset in characters from some character to another |
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| 339 | ; Corrupts registers: |
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| 340 | ; Nothing |
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[133] | 341 | ;-------------------------------------------------------------------- |
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[201] | 342 | %ifndef MODULE_STRINGS_COMPRESSED |
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[369] | 343 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 344 | DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX: |
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| 345 | test BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES |
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| 346 | jz SHORT ReturnOffsetInAX |
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| 347 | sar ax, 1 ; BYTE count to WORD count |
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| 348 | ret |
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[194] | 349 | %endif |
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[44] | 350 | |
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[491] | 351 | |
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[44] | 352 | ;-------------------------------------------------------------------- |
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| 353 | ; DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX |
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| 354 | ; Parameters: |
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| 355 | ; AX: Offset in characters from some character to another |
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| 356 | ; DS: BDA segment (zero) |
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| 357 | ; Returns: |
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| 358 | ; AX: Offset in bytes from some character to another |
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| 359 | ; Corrupts registers: |
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| 360 | ; Nothing |
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[133] | 361 | ;-------------------------------------------------------------------- |
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[201] | 362 | %ifndef MODULE_STRINGS_COMPRESSED |
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[369] | 363 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 364 | DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX: |
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| 365 | test BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES |
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| 366 | jz SHORT ReturnOffsetInAX |
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| 367 | sal ax, 1 ; WORD count to BYTE count |
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[369] | 368 | ALIGN DISPLAY_JUMP_ALIGN, ret |
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[44] | 369 | ReturnOffsetInAX: |
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| 370 | ret |
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[194] | 371 | %endif |
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