[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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| 5 | ; XTIDE Universal BIOS and Associated Tools |
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| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team. |
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| 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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| 12 | ; |
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| 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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| 16 | ; GNU General Public License for more details. |
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| 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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| 18 | ; |
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| 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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[287] | 36 | mov ax, [VIDEO_BDA.wCursorShape] |
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| 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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| 68 | jnc SHORT .DoNotSetCgaFlag |
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| 69 | or dl, FLG_CONTEXT_CGA |
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| 70 | .DoNotSetCgaFlag: |
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| 71 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], dl |
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[101] | 72 | ; Fall to .InitializeCursor |
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[41] | 73 | |
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[101] | 74 | ;-------------------------------------------------------------------- |
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| 75 | ; .InitializeCursor |
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| 76 | ; Parameters: |
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| 77 | ; DS: BDA segment (zero) |
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| 78 | ; Returns: |
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| 79 | ; Nothing |
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| 80 | ; Corrupts registers: |
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| 81 | ; AX, DX |
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| 82 | ;-------------------------------------------------------------------- |
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| 83 | .InitializeCursor: |
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[115] | 84 | call DisplayCursor_GetHardwareCoordinatesToAX ; Coordinates before init |
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| 85 | call DisplayCursor_SetCoordinatesFromAX ; Cursor to Display Context |
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[101] | 86 | ; Fall to DisplayContext_SynchronizeToHardware |
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[41] | 87 | |
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| 88 | ;-------------------------------------------------------------------- |
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[101] | 89 | ; DisplayContext_SynchronizeToHardware |
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| 90 | ; Parameters: |
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| 91 | ; DS: BDA segment (zero) |
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| 92 | ; Returns: |
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| 93 | ; Nothing |
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| 94 | ; Corrupts registers: |
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| 95 | ; AX, DX |
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| 96 | ;-------------------------------------------------------------------- |
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[369] | 97 | ALIGN DISPLAY_JUMP_ALIGN |
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[101] | 98 | DisplayContext_SynchronizeToHardware: |
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| 99 | call DisplayPage_SynchronizeToHardware |
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| 100 | call DisplayCursor_SynchronizeShapeToHardware |
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| 101 | jmp DisplayCursor_SynchronizeCoordinatesToHardware |
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| 102 | |
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| 103 | |
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| 104 | ;-------------------------------------------------------------------- |
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[41] | 105 | ; DisplayContext_Push |
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| 106 | ; Parameters: |
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| 107 | ; Nothing |
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| 108 | ; Returns: |
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| 109 | ; Nothing |
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| 110 | ; Corrupts registers: |
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| 111 | ; AX, DI |
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| 112 | ;-------------------------------------------------------------------- |
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[369] | 113 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 114 | DisplayContext_Push: |
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| 115 | mov di, ds ; Backup DS |
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| 116 | LOAD_BDA_SEGMENT_TO ds, ax |
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| 117 | pop ax ; Pop return address |
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| 118 | |
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[194] | 119 | %ifndef CHECK_FOR_UNUSED_ENTRYPOINTS |
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[41] | 120 | %assign i 0 |
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| 121 | %rep DISPLAY_CONTEXT_size / 2 |
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| 122 | push WORD [VIDEO_BDA.displayContext + i] |
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| 123 | %assign i i+2 |
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| 124 | %endrep |
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[194] | 125 | %endif |
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| 126 | |
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[41] | 127 | mov ds, di ; Restore DS |
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| 128 | jmp ax |
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| 129 | |
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| 130 | ;-------------------------------------------------------------------- |
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| 131 | ; DisplayContext_Pop |
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| 132 | ; Parameters: |
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| 133 | ; Nothing |
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| 134 | ; Returns: |
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| 135 | ; Nothing |
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| 136 | ; Corrupts registers: |
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| 137 | ; AX, DI |
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| 138 | ;-------------------------------------------------------------------- |
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[369] | 139 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 140 | DisplayContext_Pop: |
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| 141 | mov di, ds ; Backup DS |
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| 142 | LOAD_BDA_SEGMENT_TO ds, ax |
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| 143 | pop ax ; Pop return address |
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| 144 | |
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[194] | 145 | %ifndef CHECK_FOR_UNUSED_ENTRYPOINTS |
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[41] | 146 | %assign i DISPLAY_CONTEXT_size-2 |
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| 147 | %rep DISPLAY_CONTEXT_size / 2 |
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| 148 | pop WORD [VIDEO_BDA.displayContext + i] |
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| 149 | %assign i i-2 |
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| 150 | %endrep |
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[194] | 151 | %endif |
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| 152 | |
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[41] | 153 | push ax ; Push return address |
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| 154 | push dx |
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| 155 | call DisplayContext_SynchronizeToHardware |
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| 156 | pop dx |
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| 157 | mov ds, di ; Restore DS |
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| 158 | ret |
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| 159 | |
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| 160 | |
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| 161 | ;-------------------------------------------------------------------- |
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[52] | 162 | ; DisplayContext_PrepareOffScreenBufferInESBXwithLengthInCX |
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[48] | 163 | ; Parameters: |
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[52] | 164 | ; CX: Off screen buffer length in characters |
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| 165 | ; ES:BX: Ptr to off screen buffer |
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[48] | 166 | ; Returns: |
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| 167 | ; Nothing |
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| 168 | ; Corrupts registers: |
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[52] | 169 | ; AX, DI |
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[48] | 170 | ;-------------------------------------------------------------------- |
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[133] | 171 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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[369] | 172 | ALIGN DISPLAY_JUMP_ALIGN |
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[52] | 173 | DisplayContext_PrepareOffScreenBufferInESBXwithLengthInCX: |
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[48] | 174 | push ds |
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| 175 | |
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| 176 | LOAD_BDA_SEGMENT_TO ds, di |
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| 177 | xchg ax, bx |
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| 178 | mov bx, es |
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| 179 | call DisplayContext_SetCharacterPointerFromBXAX ; ES:DI now has the pointer |
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| 180 | |
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| 181 | mov bl, ATTRIBUTES_NOT_USED |
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| 182 | mov ax, BUFFER_OUTPUT_WITH_CHAR_ONLY |
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| 183 | call DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL |
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[52] | 184 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam], cx |
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[48] | 185 | |
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| 186 | mov bx, di |
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| 187 | pop ds |
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| 188 | ret |
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[133] | 189 | %endif |
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[48] | 190 | |
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| 191 | |
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| 192 | ;-------------------------------------------------------------------- |
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[41] | 193 | ; DisplayContext_SetCharacterPointerFromBXAX |
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| 194 | ; Parameters: |
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| 195 | ; BX:AX: Ptr to destination for next character to output |
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| 196 | ; DS: BDA segment (zero) |
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| 197 | ; Returns: |
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[48] | 198 | ; ES:DI: Pointer that was in BX:AX |
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[41] | 199 | ; Corrupts registers: |
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| 200 | ; AX |
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| 201 | ;-------------------------------------------------------------------- |
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[133] | 202 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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[369] | 203 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 204 | DisplayContext_SetCharacterPointerFromBXAX: |
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| 205 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], ax |
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| 206 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2], bx |
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| 207 | xchg di, ax |
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| 208 | mov es, bx |
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| 209 | ret |
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[133] | 210 | %endif |
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[41] | 211 | |
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| 212 | |
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| 213 | ;-------------------------------------------------------------------- |
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| 214 | ; DisplayContext_GetCharacterPointerToBXAX |
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| 215 | ; Parameters: |
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| 216 | ; DS: BDA segment (zero) |
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| 217 | ; Returns: |
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| 218 | ; BX:AX: Ptr to destination for next character to output |
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| 219 | ; Corrupts registers: |
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| 220 | ; Nothing |
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| 221 | ;-------------------------------------------------------------------- |
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[133] | 222 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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[369] | 223 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 224 | DisplayContext_GetCharacterPointerToBXAX: |
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| 225 | mov ax, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition] |
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| 226 | mov bx, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2] |
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| 227 | ret |
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[133] | 228 | %endif |
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[41] | 229 | |
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| 230 | |
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| 231 | ;-------------------------------------------------------------------- |
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[45] | 232 | ; DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL |
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[41] | 233 | ; Parameters: |
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| 234 | ; AX: Offset to character output function |
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[45] | 235 | ; BL: Attribute Flag |
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[41] | 236 | ; DS: BDA segment (zero) |
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| 237 | ; Returns: |
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| 238 | ; Nothing |
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| 239 | ; Corrupts registers: |
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[50] | 240 | ; BL |
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[41] | 241 | ;-------------------------------------------------------------------- |
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[369] | 242 | ALIGN DISPLAY_JUMP_ALIGN |
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[45] | 243 | DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL: |
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[50] | 244 | and bl, FLG_CONTEXT_ATTRIBUTES |
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| 245 | and BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], ~FLG_CONTEXT_ATTRIBUTES |
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| 246 | or [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], bl |
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[41] | 247 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut], ax |
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| 248 | ret |
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[194] | 249 | |
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[41] | 250 | |
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| 251 | ;-------------------------------------------------------------------- |
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| 252 | ; DisplayContext_SetCharacterAttributeFromAL |
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| 253 | ; Parameters: |
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| 254 | ; AL: Character attribute |
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| 255 | ; DS: BDA segment (zero) |
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| 256 | ; Returns: |
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| 257 | ; Nothing |
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| 258 | ; Corrupts registers: |
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| 259 | ; Nothing |
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| 260 | ;-------------------------------------------------------------------- |
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[369] | 261 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 262 | DisplayContext_SetCharacterAttributeFromAL: |
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| 263 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], al |
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| 264 | ret |
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| 265 | |
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| 266 | |
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| 267 | ;-------------------------------------------------------------------- |
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| 268 | ; DisplayContext_SetCharacterOutputParameterFromAX |
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| 269 | ; Parameters: |
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| 270 | ; AX: Parameter for Character Output function |
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| 271 | ; DS: BDA segment (zero) |
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| 272 | ; Returns: |
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| 273 | ; Nothing |
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| 274 | ; Corrupts registers: |
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| 275 | ; Nothing |
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| 276 | ;-------------------------------------------------------------------- |
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[369] | 277 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 278 | DisplayContext_SetCharacterOutputParameterFromAX: |
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| 279 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam], ax |
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| 280 | ret |
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| 281 | |
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[194] | 282 | |
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[41] | 283 | ;-------------------------------------------------------------------- |
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| 284 | ; DisplayContext_GetCharacterOutputParameterToDX |
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| 285 | ; Parameters: |
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| 286 | ; DS: BDA segment (zero) |
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| 287 | ; Returns: |
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| 288 | ; DX: User parameter for Character Output function |
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| 289 | ; Corrupts registers: |
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| 290 | ; Nothing |
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[133] | 291 | ;-------------------------------------------------------------------- |
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[181] | 292 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS OR EXCLUDE_FROM_XTIDECFG ; This is currently unused (dead code) |
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[369] | 293 | ALIGN DISPLAY_JUMP_ALIGN |
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[181] | 294 | DisplayContext_GetCharacterOutputParameterToDX: |
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| 295 | mov dx, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam] |
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| 296 | ret |
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| 297 | %endif |
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[44] | 298 | |
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| 299 | |
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| 300 | ;-------------------------------------------------------------------- |
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| 301 | ; DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX |
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| 302 | ; Parameters: |
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| 303 | ; AX: Offset in bytes from some character to another |
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| 304 | ; DS: BDA segment (zero) |
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| 305 | ; Returns: |
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| 306 | ; AX: Offset in characters from some character to another |
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| 307 | ; Corrupts registers: |
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| 308 | ; Nothing |
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[133] | 309 | ;-------------------------------------------------------------------- |
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[201] | 310 | %ifndef MODULE_STRINGS_COMPRESSED |
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[369] | 311 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 312 | DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX: |
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| 313 | test BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES |
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| 314 | jz SHORT ReturnOffsetInAX |
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| 315 | sar ax, 1 ; BYTE count to WORD count |
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| 316 | ret |
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[194] | 317 | %endif |
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[44] | 318 | |
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[194] | 319 | |
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[44] | 320 | ;-------------------------------------------------------------------- |
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| 321 | ; DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX |
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| 322 | ; Parameters: |
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| 323 | ; AX: Offset in characters from some character to another |
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| 324 | ; DS: BDA segment (zero) |
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| 325 | ; Returns: |
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| 326 | ; AX: Offset in bytes from some character to another |
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| 327 | ; Corrupts registers: |
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| 328 | ; Nothing |
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[133] | 329 | ;-------------------------------------------------------------------- |
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[201] | 330 | %ifndef MODULE_STRINGS_COMPRESSED |
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[369] | 331 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 332 | DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX: |
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| 333 | test BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES |
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| 334 | jz SHORT ReturnOffsetInAX |
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| 335 | sal ax, 1 ; WORD count to BYTE count |
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[369] | 336 | ALIGN DISPLAY_JUMP_ALIGN, ret |
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[44] | 337 | ReturnOffsetInAX: |
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| 338 | ret |
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[194] | 339 | %endif |
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