1 | ; Project name : Assembly Library |
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2 | ; Description : Functions for managing display page. |
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3 | |
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4 | ; |
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5 | ; XTIDE Universal BIOS and Associated Tools |
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6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 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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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 | ; DisplayPage_SetFromAL |
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25 | ; Parameters: |
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26 | ; AL: New display page |
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27 | ; DS: BDA segment (zero) |
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28 | ; Returns: |
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29 | ; Nothing |
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30 | ; Corrupts registers: |
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31 | ; AX, DX |
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32 | ;-------------------------------------------------------------------- |
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33 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS OR EXCLUDE_FROM_XTIDECFG |
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34 | ALIGN DISPLAY_JUMP_ALIGN |
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35 | DisplayPage_SetFromAL: |
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36 | xor ah, ah |
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37 | mul WORD [VIDEO_BDA.wBytesPerPage] ; AX = Offset to page |
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38 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], ax |
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39 | ret |
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40 | %endif |
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41 | |
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42 | |
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43 | %ifdef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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44 | %define EXCLUDE |
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45 | %ifdef MODULE_HOTKEYS |
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46 | %undef EXCLUDE |
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47 | %endif |
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48 | %ifdef MODULE_BOOT_MENU |
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49 | %undef EXCLUDE |
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50 | %endif |
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51 | %endif |
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52 | |
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53 | %ifndef EXCLUDE |
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54 | ;-------------------------------------------------------------------- |
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55 | ; DisplayPage_GetColumnsToALandRowsToAH |
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56 | ; Parameters: |
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57 | ; DS: BDA segment (zero) |
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58 | ; Returns: |
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59 | ; AL: Number of columns in selected text mode |
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60 | ; AH: Number of rows in selected text mode |
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61 | ; Corrupts registers: |
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62 | ; Nothing |
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63 | ;-------------------------------------------------------------------- |
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64 | ALIGN DISPLAY_JUMP_ALIGN |
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65 | DisplayPage_GetColumnsToALandRowsToAH: |
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66 | mov al, [VIDEO_BDA.wColumns] ; 40 or 80 |
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67 | mov ah, 25 ; Always 25 rows on standard text modes |
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68 | ret |
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69 | %endif |
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70 | %undef EXCLUDE |
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71 | |
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72 | ;-------------------------------------------------------------------- |
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73 | ; DisplayPage_SynchronizeToHardware |
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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 | ALIGN DISPLAY_JUMP_ALIGN |
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82 | DisplayPage_SynchronizeToHardware: |
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83 | xor dx, dx |
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84 | mov ax, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition] |
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85 | div WORD [VIDEO_BDA.wBytesPerPage] ; AX = Page |
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86 | |
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87 | cmp al, [VIDEO_BDA.bActivePage] |
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88 | je SHORT .Return ; Same page, no need to synchronize |
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89 | mov ah, SELECT_ACTIVE_DISPLAY_PAGE |
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90 | int BIOS_VIDEO_INTERRUPT_10h |
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91 | .Return: |
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92 | ret |
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