source: xtideuniversalbios/trunk/Assembly_Library/Src/Display/DisplayCharOut.asm@ 520

Last change on this file since 520 was 376, checked in by gregli@…, 13 years ago

WIDE checkin... Added copyright and license information to sorce files, as per the GPL instructions for usage.
File size: 4.1 KB
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[41]1; Project name : Assembly Library
2; Description : Functions for outputting characters to video memory.
3; These functions are meant to be called by Display_CharacterFromAL
4; and Display_RepeatCharacterFromAL using function pointer
5; stored in DISPLAY_CONTEXT.
6
[376]7;
8; XTIDE Universal BIOS and Associated Tools
9; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team.
10;
11; This program is free software; you can redistribute it and/or modify
12; it under the terms of the GNU General Public License as published by
13; the Free Software Foundation; either version 2 of the License, or
14; (at your option) any later version.
15;
16; This program is distributed in the hope that it will be useful,
17; but WITHOUT ANY WARRANTY; without even the implied warranty of
18; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19; GNU General Public License for more details.
20; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
21;
22
[41]23; Section containing code
24SECTION .text
25
26;--------------------------------------------------------------------
27; DisplayCharOut_TeletypeOutputWithAttribute
28; DisplayCharOut_TeletypeOutput
29; Parameters:
30; AL: Character to output
31; AH: Attribute to output
32; DS: BDA segment (zero)
33; ES:DI: Ptr to video memory where to output
34; Returns:
35; DI: Incremented for next character
36; Corrupts registers:
37; AX, DX
38;--------------------------------------------------------------------
[369]39ALIGN DISPLAY_JUMP_ALIGN
[41]40DisplayCharOut_TeletypeOutputWithAttribute:
41 cmp al, ' ' ; Printable character?
42 jb SHORT DisplayCharOut_BiosTeletypeOutput
[42]43 WAIT_RETRACE_IF_NECESSARY_THEN stosw
[41]44 ret
45
[369]46ALIGN DISPLAY_JUMP_ALIGN
[41]47DisplayCharOut_TeletypeOutput:
48 cmp al, ' ' ; Printable character?
49 jae SHORT DisplayCharOut_Character
50 ; Fall to DisplayCharOut_BiosTeletypeOutput
51
52;--------------------------------------------------------------------
53; DisplayCharOut_BiosTeletypeOutput
54; Parameters:
55; AL: Control character
56; DS: BDA segment (zero)
57; ES:DI: Ptr to video memory where to output
58; Returns:
59; DI: Incremented for next character
60; Corrupts registers:
61; AX, DX
62;--------------------------------------------------------------------
[369]63ALIGN DISPLAY_JUMP_ALIGN
[41]64DisplayCharOut_BiosTeletypeOutput:
65 push ax
66 call DisplayCursor_SynchronizeCoordinatesToHardware
67 pop ax
68
[101]69 ; Output character with BIOS
[41]70 push bx
71 mov ah, TELETYPE_OUTPUT
72 mov bh, [VIDEO_BDA.bActivePage]
73 int BIOS_VIDEO_INTERRUPT_10h
74 pop bx
75
[101]76 call DisplayCursor_GetHardwareCoordinatesToAX
77 jmp DisplayCursor_SetCoordinatesFromAX
[41]78
[101]79
[41]80;--------------------------------------------------------------------
81; DisplayCharOut_Attribute
82; DisplayCharOut_Character
83; DisplayCharOut_CharacterWithAttribute
84; Parameters:
85; AL: Character to output
86; AH: Attribute to output
[42]87; DS: BDA segment (zero)
[41]88; ES:DI: Ptr to video memory where to output
89; Returns:
90; DI: Incremented for next character
91; Corrupts registers:
[42]92; AX, DX
[41]93;--------------------------------------------------------------------
[369]94ALIGN DISPLAY_JUMP_ALIGN
[41]95DisplayCharOut_Attribute:
96 xchg al, ah ; Swap character and attribute
97 inc di ; Skip character
[42]98 WAIT_RETRACE_IF_NECESSARY_THEN stosb
[41]99 ret
100
[369]101ALIGN DISPLAY_JUMP_ALIGN
[41]102DisplayCharOut_Character:
[42]103 WAIT_RETRACE_IF_NECESSARY_THEN stosb
[41]104 inc di ; Skip attribute
105 ret
106
[369]107ALIGN DISPLAY_JUMP_ALIGN
[41]108DisplayCharOut_CharacterWithAttribute:
[42]109 WAIT_RETRACE_IF_NECESSARY_THEN stosw
[41]110 ret
111
112
113;--------------------------------------------------------------------
114; DisplayCharOut_WriteCharacterToBuffer
115; Parameters:
116; AL: Character to output
117; DS: BDA segment (zero)
118; ES:DI: Ptr to destination string buffer
[55]119; DISPLAY_CONTEXT.wCharOutParam: Characters left in buffer
[41]120; Returns:
121; ES:DI: Updated for next character
122; Corrupts registers:
123; AX, DX
124;--------------------------------------------------------------------
[369]125ALIGN DISPLAY_JUMP_ALIGN
[41]126DisplayCharOut_WriteCharacterToBuffer:
[55]127 cmp WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam], BYTE 0
128 je SHORT .BufferFull
[41]129 stosb
[55]130 dec WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam]
[41]131.BufferFull:
132 ret
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