[41] | 1 | ; Project name : Assembly Library |
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| 2 | ; Description : Functions for managing display cursor. |
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| 3 | |
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[376] | 4 | ; |
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[445] | 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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[445] | 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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[445] | 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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[445] | 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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[407] | 24 | ; DisplayCursor_GetDefaultCursorShapeToAX |
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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 | ; AX: Default text mode cursor shape |
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| 29 | ; Corrupts registers: |
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| 30 | ; Nothing |
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| 31 | ;-------------------------------------------------------------------- |
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| 32 | ALIGN DISPLAY_JUMP_ALIGN |
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| 33 | DisplayCursor_GetDefaultCursorShapeToAX: |
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| 34 | mov ax, CURSOR_NORMAL_COLOR ; CGA, EGA, VGA cursor |
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| 35 | cmp BYTE [VIDEO_BDA.bMode], MDA_TEXT_MODE |
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| 36 | eCMOVE ax, CURSOR_NORMAL_MDA ; MDA cursor |
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| 37 | ret |
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| 38 | |
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[489] | 39 | %ifdef INCLUDE_MENU_LIBRARY |
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[407] | 40 | ;-------------------------------------------------------------------- |
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[41] | 41 | ; DisplayCursor_SetShapeFromAX |
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| 42 | ; Parameters: |
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| 43 | ; AX: Cursor shape (AH=Start scan line, AL=End scan line) |
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| 44 | ; DS: BDA segment (zero) |
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| 45 | ; Returns: |
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| 46 | ; Nothing |
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| 47 | ; Corrupts registers: |
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| 48 | ; Nothing |
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| 49 | ;-------------------------------------------------------------------- |
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[369] | 50 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 51 | DisplayCursor_SetShapeFromAX: |
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| 52 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCursorShape], ax |
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| 53 | ret |
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[489] | 54 | %endif |
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| 55 | |
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[41] | 56 | ;-------------------------------------------------------------------- |
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| 57 | ; DisplayCursor_SetCoordinatesFromAX |
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| 58 | ; Parameters: |
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| 59 | ; AL: Cursor column (X-coordinate) |
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| 60 | ; AH: Cursor row (Y-coordinate) |
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| 61 | ; DS: BDA segment (zero) |
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| 62 | ; Returns: |
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| 63 | ; DI: Offset to cursor location in video RAM |
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| 64 | ; Corrupts registers: |
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| 65 | ; AX, DX |
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| 66 | ;-------------------------------------------------------------------- |
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[369] | 67 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 68 | DisplayCursor_SetCoordinatesFromAX: |
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| 69 | xchg dx, ax |
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| 70 | mov ax, [VIDEO_BDA.wColumns] ; Column count, 40 or 80 |
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| 71 | mul dh ; AX = Column count * row index |
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[101] | 72 | xor dh, dh |
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| 73 | add ax, dx ; Add column offset |
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[445] | 74 | eSHL_IM ax, 1 ; Convert to WORD offset |
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[101] | 75 | add ax, [VIDEO_BDA.wPageOffset] ; AX = Video RAM offset |
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| 76 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], ax |
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| 77 | xchg di, ax |
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[41] | 78 | ret |
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| 79 | |
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| 80 | |
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| 81 | ;-------------------------------------------------------------------- |
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| 82 | ; DisplayCursor_GetSoftwareCoordinatesToAX |
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| 83 | ; Parameters: |
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| 84 | ; AX: Offset to cursor location in selected page |
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| 85 | ; DS: BDA segment (zero) |
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| 86 | ; Returns: |
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| 87 | ; AL: Cursor column (X-coordinate) |
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| 88 | ; AH: Cursor row (Y-coordinate) |
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| 89 | ; Corrupts registers: |
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| 90 | ; Nothing |
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| 91 | ;-------------------------------------------------------------------- |
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[369] | 92 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 93 | DisplayCursor_GetSoftwareCoordinatesToAX: |
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| 94 | mov ax, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition] |
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| 95 | sub ax, [VIDEO_BDA.wPageOffset] |
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| 96 | shr ax, 1 ; WORD offset to character offset |
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| 97 | div BYTE [VIDEO_BDA.wColumns] ; AL = full rows, AH = column index for last row |
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| 98 | xchg al, ah |
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| 99 | ret |
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| 100 | |
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| 101 | |
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| 102 | ;-------------------------------------------------------------------- |
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| 103 | ; DisplayCursor_GetHardwareCoordinatesToAX |
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| 104 | ; Parameters: |
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| 105 | ; DS: BDA segment (zero) |
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| 106 | ; Returns: |
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| 107 | ; AL: Hardware cursor column (X-coordinate) |
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| 108 | ; AH: Hardware cursor row (Y-coordinate) |
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| 109 | ; Corrupts registers: |
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| 110 | ; DX |
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| 111 | ;-------------------------------------------------------------------- |
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[369] | 112 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 113 | DisplayCursor_GetHardwareCoordinatesToAX: |
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| 114 | push cx |
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| 115 | push bx |
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| 116 | |
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| 117 | mov ah, GET_CURSOR_POSITION_AND_SIZE |
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| 118 | mov bh, [VIDEO_BDA.bActivePage] |
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| 119 | int BIOS_VIDEO_INTERRUPT_10h |
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| 120 | xchg ax, dx |
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| 121 | |
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| 122 | pop bx |
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| 123 | pop cx |
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| 124 | ret |
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| 125 | |
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| 126 | |
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| 127 | ;-------------------------------------------------------------------- |
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| 128 | ; DisplayCursor_SynchronizeShapeToHardware |
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| 129 | ; Parameters: |
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| 130 | ; DS: BDA segment (zero) |
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| 131 | ; Returns: |
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| 132 | ; Nothing |
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| 133 | ; Corrupts registers: |
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| 134 | ; AX, DX |
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| 135 | ;-------------------------------------------------------------------- |
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[369] | 136 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 137 | DisplayCursor_SynchronizeShapeToHardware: |
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| 138 | mov dx, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCursorShape] |
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| 139 | ; Fall to .SetHardwareCursorShapeFromDX |
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| 140 | |
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| 141 | ;-------------------------------------------------------------------- |
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| 142 | ; .SetHardwareCursorShapeFromDX |
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| 143 | ; Parameters: |
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| 144 | ; DX: Cursor shape |
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| 145 | ; DS: BDA segment (zero) |
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| 146 | ; Returns: |
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| 147 | ; Nothing |
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| 148 | ; Corrupts registers: |
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| 149 | ; AX |
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| 150 | ;-------------------------------------------------------------------- |
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| 151 | .SetHardwareCursorShapeFromDX: |
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| 152 | cmp dx, [VIDEO_BDA.wCursorShape] |
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| 153 | je SHORT .Return ; Return if no changes |
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| 154 | push cx |
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| 155 | mov cx, dx ; BIOS wants cursor shape in CX |
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| 156 | mov al, [VIDEO_BDA.bMode] ; Load video mode to prevent lock ups on some BIOSes |
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| 157 | mov ah, SET_TEXT_MODE_CURSOR_SHAPE |
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| 158 | int BIOS_VIDEO_INTERRUPT_10h |
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| 159 | pop cx |
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| 160 | .Return: |
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| 161 | ret |
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| 162 | |
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| 163 | |
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| 164 | ;-------------------------------------------------------------------- |
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| 165 | ; DisplayCursor_SynchronizeCoordinatesToHardware |
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| 166 | ; Parameters: |
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| 167 | ; DS: BDA segment (zero) |
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| 168 | ; Returns: |
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| 169 | ; Nothing |
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| 170 | ; Corrupts registers: |
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| 171 | ; AX, DX |
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| 172 | ;-------------------------------------------------------------------- |
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[369] | 173 | ALIGN DISPLAY_JUMP_ALIGN |
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[41] | 174 | DisplayCursor_SynchronizeCoordinatesToHardware: |
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| 175 | call DisplayCursor_GetSoftwareCoordinatesToAX |
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| 176 | ; Fall to .SetHardwareCursorCoordinatesFromAX |
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| 177 | |
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| 178 | ;-------------------------------------------------------------------- |
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| 179 | ; .SetHardwareCursorCoordinatesFromAX |
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| 180 | ; Parameters: |
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| 181 | ; AL: Cursor column (X-coordinate) |
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| 182 | ; AH: Cursor row (Y-coordinate) |
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| 183 | ; DS: BDA segment (zero) |
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| 184 | ; Returns: |
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| 185 | ; Nothing |
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| 186 | ; Corrupts registers: |
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| 187 | ; AX, DX |
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| 188 | ;-------------------------------------------------------------------- |
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| 189 | .SetHardwareCursorCoordinatesFromAX: |
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| 190 | push bx |
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| 191 | xchg dx, ax ; BIOS wants coordinates in DX |
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| 192 | mov ah, SET_CURSOR_POSITION |
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| 193 | mov bh, [VIDEO_BDA.bActivePage] |
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| 194 | int BIOS_VIDEO_INTERRUPT_10h |
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| 195 | pop bx |
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| 196 | ret |
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