source: xtideuniversalbios/trunk/Assembly_Library/Src/Display/DisplayPage.asm@ 574

Last change on this file since 574 was 526, checked in by krille_n_@…, 12 years ago

Changes:

  • Update of the copyright notices to include the year 2013.
File size: 2.8 KB
Line 
1; Project name : Assembly Library
2; Description : Functions for managing display page.
3
4;
5; XTIDE Universal BIOS and Associated Tools
6; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
7;
8; This program is free software; you can redistribute it and/or modify
9; it under the terms of the GNU General Public License as published by
10; the Free Software Foundation; either version 2 of the License, or
11; (at your option) any later version.
12;
13; This program is distributed in the hope that it will be useful,
14; but WITHOUT ANY WARRANTY; without even the implied warranty of
15; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16; GNU General Public License for more details.
17; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
18;
19
20; Section containing code
21SECTION .text
22
23;--------------------------------------------------------------------
24; DisplayPage_SetFromAL
25; Parameters:
26; AL: New display page
27; DS: BDA segment (zero)
28; Returns:
29; Nothing
30; Corrupts registers:
31; AX, DX
32;--------------------------------------------------------------------
33%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS OR EXCLUDE_FROM_XTIDECFG
34ALIGN DISPLAY_JUMP_ALIGN
35DisplayPage_SetFromAL:
36 xor ah, ah
37 mul WORD [VIDEO_BDA.wBytesPerPage] ; AX = Offset to page
38 mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], ax
39 ret
40%endif
41
42
43%ifdef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
44 %define EXCLUDE
45 %ifdef MODULE_HOTKEYS
46 %undef EXCLUDE
47 %endif
48 %ifdef MODULE_BOOT_MENU
49 %undef EXCLUDE
50 %endif
51%endif
52
53%ifndef EXCLUDE
54;--------------------------------------------------------------------
55; DisplayPage_GetColumnsToALandRowsToAH
56; Parameters:
57; DS: BDA segment (zero)
58; Returns:
59; AL: Number of columns in selected text mode
60; AH: Number of rows in selected text mode
61; Corrupts registers:
62; Nothing
63;--------------------------------------------------------------------
64ALIGN DISPLAY_JUMP_ALIGN
65DisplayPage_GetColumnsToALandRowsToAH:
66 mov al, [VIDEO_BDA.wColumns] ; 40 or 80
67 mov ah, 25 ; Always 25 rows on standard text modes
68 ret
69%endif
70%undef EXCLUDE
71
72;--------------------------------------------------------------------
73; DisplayPage_SynchronizeToHardware
74; Parameters:
75; DS: BDA segment (zero)
76; Returns:
77; Nothing
78; Corrupts registers:
79; AX, DX
80;--------------------------------------------------------------------
81ALIGN DISPLAY_JUMP_ALIGN
82DisplayPage_SynchronizeToHardware:
83 xor dx, dx
84 mov ax, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition]
85 div WORD [VIDEO_BDA.wBytesPerPage] ; AX = Page
86
87 cmp al, [VIDEO_BDA.bActivePage]
88 je SHORT .Return ; Same page, no need to synchronize
89 mov ah, SELECT_ACTIVE_DISPLAY_PAGE
90 int BIOS_VIDEO_INTERRUPT_10h
91.Return:
92 ret
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