[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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[376] | 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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[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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| 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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[491] | 106 | ; DisplayContext_Pop |
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[41] | 107 | ; Parameters: |
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| 108 | ; Nothing |
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| 109 | ; Returns: |
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| 110 | ; Nothing |
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| 111 | ; Corrupts registers: |
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| 112 | ; AX, DI |
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| 113 | ;-------------------------------------------------------------------- |
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[491] | 114 | %ifdef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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| 115 | %ifndef MODULE_BOOT_MENU |
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| 116 | %define EXCLUDE |
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| 117 | %endif |
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| 118 | %endif |
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| 119 | |
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| 120 | %ifndef EXCLUDE |
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[369] | 121 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 122 | DisplayContext_Push: |
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| 123 | mov di, ds ; Backup DS |
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| 124 | LOAD_BDA_SEGMENT_TO ds, ax |
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| 125 | pop ax ; Pop return address |
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| 126 | |
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[194] | 127 | %ifndef CHECK_FOR_UNUSED_ENTRYPOINTS |
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[41] | 128 | %assign i 0 |
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| 129 | %rep DISPLAY_CONTEXT_size / 2 |
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| 130 | push WORD [VIDEO_BDA.displayContext + i] |
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| 131 | %assign i i+2 |
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| 132 | %endrep |
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[194] | 133 | %endif |
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[491] | 134 | |
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[41] | 135 | mov ds, di ; Restore DS |
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| 136 | jmp ax |
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| 137 | |
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[491] | 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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[491] | 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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[491] | 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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[491] | 159 | %endif ; EXCLUDE |
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| 160 | %undef EXCLUDE |
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[41] | 161 | |
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[491] | 162 | |
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[41] | 163 | ;-------------------------------------------------------------------- |
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[52] | 164 | ; DisplayContext_PrepareOffScreenBufferInESBXwithLengthInCX |
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[48] | 165 | ; Parameters: |
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[52] | 166 | ; CX: Off screen buffer length in characters |
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| 167 | ; ES:BX: Ptr to off screen buffer |
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[48] | 168 | ; Returns: |
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| 169 | ; Nothing |
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| 170 | ; Corrupts registers: |
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[52] | 171 | ; AX, DI |
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[48] | 172 | ;-------------------------------------------------------------------- |
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[133] | 173 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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[369] | 174 | ALIGN DISPLAY_JUMP_ALIGN |
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[52] | 175 | DisplayContext_PrepareOffScreenBufferInESBXwithLengthInCX: |
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[48] | 176 | push ds |
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| 177 | |
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| 178 | LOAD_BDA_SEGMENT_TO ds, di |
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| 179 | xchg ax, bx |
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| 180 | mov bx, es |
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| 181 | call DisplayContext_SetCharacterPointerFromBXAX ; ES:DI now has the pointer |
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| 182 | |
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| 183 | mov bl, ATTRIBUTES_NOT_USED |
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| 184 | mov ax, BUFFER_OUTPUT_WITH_CHAR_ONLY |
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| 185 | call DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL |
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[52] | 186 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam], cx |
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[48] | 187 | |
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| 188 | mov bx, di |
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| 189 | pop ds |
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| 190 | ret |
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[491] | 191 | %endif ; EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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[48] | 192 | |
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| 193 | |
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| 194 | ;-------------------------------------------------------------------- |
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[41] | 195 | ; DisplayContext_SetCharacterPointerFromBXAX |
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| 196 | ; Parameters: |
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| 197 | ; BX:AX: Ptr to destination for next character to output |
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| 198 | ; DS: BDA segment (zero) |
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| 199 | ; Returns: |
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[48] | 200 | ; ES:DI: Pointer that was in BX:AX |
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[41] | 201 | ; Corrupts registers: |
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| 202 | ; AX |
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| 203 | ;-------------------------------------------------------------------- |
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[133] | 204 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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[369] | 205 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 206 | DisplayContext_SetCharacterPointerFromBXAX: |
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| 207 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], ax |
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| 208 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2], bx |
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| 209 | xchg di, ax |
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| 210 | mov es, bx |
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| 211 | ret |
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[133] | 212 | %endif |
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[41] | 213 | |
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| 214 | |
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| 215 | ;-------------------------------------------------------------------- |
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| 216 | ; DisplayContext_GetCharacterPointerToBXAX |
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| 217 | ; Parameters: |
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| 218 | ; DS: BDA segment (zero) |
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| 219 | ; Returns: |
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| 220 | ; BX:AX: Ptr to destination for next character to output |
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| 221 | ; Corrupts registers: |
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| 222 | ; Nothing |
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| 223 | ;-------------------------------------------------------------------- |
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[133] | 224 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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[369] | 225 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 226 | DisplayContext_GetCharacterPointerToBXAX: |
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| 227 | mov ax, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition] |
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| 228 | mov bx, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2] |
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| 229 | ret |
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[133] | 230 | %endif |
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[41] | 231 | |
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| 232 | |
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[491] | 233 | %ifdef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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| 234 | %ifndef MODULE_BOOT_MENU |
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| 235 | %define EXCLUDE |
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| 236 | %endif |
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| 237 | %endif |
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[41] | 238 | ;-------------------------------------------------------------------- |
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[45] | 239 | ; DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL |
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[41] | 240 | ; Parameters: |
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| 241 | ; AX: Offset to character output function |
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[45] | 242 | ; BL: Attribute Flag |
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[41] | 243 | ; DS: BDA segment (zero) |
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| 244 | ; Returns: |
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| 245 | ; Nothing |
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| 246 | ; Corrupts registers: |
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[50] | 247 | ; BL |
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[41] | 248 | ;-------------------------------------------------------------------- |
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[491] | 249 | %ifndef EXCLUDE ; 1 of 3 |
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[369] | 250 | ALIGN DISPLAY_JUMP_ALIGN |
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[45] | 251 | DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL: |
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[50] | 252 | and bl, FLG_CONTEXT_ATTRIBUTES |
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| 253 | and BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], ~FLG_CONTEXT_ATTRIBUTES |
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| 254 | or [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], bl |
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[41] | 255 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut], ax |
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| 256 | ret |
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[491] | 257 | %endif |
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[41] | 258 | |
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[489] | 259 | |
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[41] | 260 | ;-------------------------------------------------------------------- |
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| 261 | ; DisplayContext_SetCharacterAttributeFromAL |
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| 262 | ; Parameters: |
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| 263 | ; AL: Character attribute |
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| 264 | ; DS: BDA segment (zero) |
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| 265 | ; Returns: |
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| 266 | ; Nothing |
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| 267 | ; Corrupts registers: |
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| 268 | ; Nothing |
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| 269 | ;-------------------------------------------------------------------- |
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[491] | 270 | %ifndef EXCLUDE ; 2 of 3 |
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[369] | 271 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 272 | DisplayContext_SetCharacterAttributeFromAL: |
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| 273 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], al |
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| 274 | ret |
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[491] | 275 | %endif |
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[41] | 276 | |
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| 277 | |
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| 278 | ;-------------------------------------------------------------------- |
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| 279 | ; DisplayContext_SetCharacterOutputParameterFromAX |
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| 280 | ; Parameters: |
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| 281 | ; AX: Parameter for Character Output function |
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| 282 | ; DS: BDA segment (zero) |
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| 283 | ; Returns: |
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| 284 | ; Nothing |
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| 285 | ; Corrupts registers: |
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| 286 | ; Nothing |
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| 287 | ;-------------------------------------------------------------------- |
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[491] | 288 | %ifndef EXCLUDE ; 3 of 3 |
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[369] | 289 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 290 | DisplayContext_SetCharacterOutputParameterFromAX: |
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| 291 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam], ax |
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| 292 | ret |
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[491] | 293 | %endif |
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| 294 | |
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| 295 | %undef EXCLUDE |
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| 296 | |
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| 297 | |
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[41] | 298 | ;-------------------------------------------------------------------- |
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| 299 | ; DisplayContext_GetCharacterOutputParameterToDX |
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| 300 | ; Parameters: |
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| 301 | ; DS: BDA segment (zero) |
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| 302 | ; Returns: |
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| 303 | ; DX: User parameter for Character Output function |
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| 304 | ; Corrupts registers: |
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| 305 | ; Nothing |
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[133] | 306 | ;-------------------------------------------------------------------- |
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[491] | 307 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS OR EXCLUDE_FROM_XTIDECFG |
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[369] | 308 | ALIGN DISPLAY_JUMP_ALIGN |
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[181] | 309 | DisplayContext_GetCharacterOutputParameterToDX: |
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| 310 | mov dx, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam] |
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| 311 | ret |
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| 312 | %endif |
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[44] | 313 | |
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| 314 | |
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| 315 | ;-------------------------------------------------------------------- |
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| 316 | ; DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX |
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| 317 | ; Parameters: |
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| 318 | ; AX: Offset in bytes from some character to another |
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| 319 | ; DS: BDA segment (zero) |
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| 320 | ; Returns: |
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| 321 | ; AX: Offset in characters from some character to another |
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| 322 | ; Corrupts registers: |
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| 323 | ; Nothing |
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[133] | 324 | ;-------------------------------------------------------------------- |
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[201] | 325 | %ifndef MODULE_STRINGS_COMPRESSED |
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[369] | 326 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 327 | DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX: |
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| 328 | test BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES |
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| 329 | jz SHORT ReturnOffsetInAX |
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| 330 | sar ax, 1 ; BYTE count to WORD count |
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| 331 | ret |
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[194] | 332 | %endif |
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[44] | 333 | |
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[491] | 334 | |
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[44] | 335 | ;-------------------------------------------------------------------- |
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| 336 | ; DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX |
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| 337 | ; Parameters: |
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| 338 | ; AX: Offset in characters from some character to another |
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| 339 | ; DS: BDA segment (zero) |
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| 340 | ; Returns: |
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| 341 | ; AX: Offset in bytes from some character to another |
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| 342 | ; Corrupts registers: |
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| 343 | ; Nothing |
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[133] | 344 | ;-------------------------------------------------------------------- |
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[201] | 345 | %ifndef MODULE_STRINGS_COMPRESSED |
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[369] | 346 | ALIGN DISPLAY_JUMP_ALIGN |
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[44] | 347 | DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX: |
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| 348 | test BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES |
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| 349 | jz SHORT ReturnOffsetInAX |
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| 350 | sal ax, 1 ; WORD count to BYTE count |
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[369] | 351 | ALIGN DISPLAY_JUMP_ALIGN, ret |
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[44] | 352 | ReturnOffsetInAX: |
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| 353 | ret |
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[194] | 354 | %endif |
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