source: xtideuniversalbios/trunk/Assembly_Library/Src/Display/DisplayCharOut.asm @ 369

Last change on this file since 369 was 369, checked in by gregli@…, 12 years ago

Removed align directives for initalization code and added define for align in boot-time calls to the assembly library (defaulting to 1), resulting in a significant savings for the AT and 386 builds. Fixed a bug with switch command line handling in the serial server. Put in CR characters in licesnse.txt, so that it properly displays on Windows. In the configurator, added default values for user supplied CHS and LBA values, defaulting to values within range when those features are enabled. Updated the copyright message in the configurator as the literal word Copyright is important.
File size: 3.5 KB
RevLine 
[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
7; Section containing code
8SECTION .text
9
10;--------------------------------------------------------------------
11; DisplayCharOut_TeletypeOutputWithAttribute
12; DisplayCharOut_TeletypeOutput
13;   Parameters:
14;       AL:     Character to output
15;       AH:     Attribute to output
16;       DS:     BDA segment (zero)
17;       ES:DI:  Ptr to video memory where to output
18;   Returns:
19;       DI:     Incremented for next character
20;   Corrupts registers:
21;       AX, DX
22;--------------------------------------------------------------------
[369]23ALIGN DISPLAY_JUMP_ALIGN
[41]24DisplayCharOut_TeletypeOutputWithAttribute:
25    cmp     al, ' '                         ; Printable character?
26    jb      SHORT DisplayCharOut_BiosTeletypeOutput
[42]27    WAIT_RETRACE_IF_NECESSARY_THEN stosw
[41]28    ret
29
[369]30ALIGN DISPLAY_JUMP_ALIGN
[41]31DisplayCharOut_TeletypeOutput:
32    cmp     al, ' '                         ; Printable character?
33    jae     SHORT DisplayCharOut_Character
34    ; Fall to DisplayCharOut_BiosTeletypeOutput
35
36;--------------------------------------------------------------------
37; DisplayCharOut_BiosTeletypeOutput
38;   Parameters:
39;       AL:     Control character
40;       DS:     BDA segment (zero)
41;       ES:DI:  Ptr to video memory where to output
42;   Returns:
43;       DI:     Incremented for next character
44;   Corrupts registers:
45;       AX, DX
46;--------------------------------------------------------------------
[369]47ALIGN DISPLAY_JUMP_ALIGN
[41]48DisplayCharOut_BiosTeletypeOutput:
49    push    ax
50    call    DisplayCursor_SynchronizeCoordinatesToHardware
51    pop     ax
52
[101]53    ; Output character with BIOS
[41]54    push    bx
55    mov     ah, TELETYPE_OUTPUT
56    mov     bh, [VIDEO_BDA.bActivePage]
57    int     BIOS_VIDEO_INTERRUPT_10h
58    pop     bx
59
[101]60    call    DisplayCursor_GetHardwareCoordinatesToAX
61    jmp     DisplayCursor_SetCoordinatesFromAX
[41]62
[101]63
[41]64;--------------------------------------------------------------------
65; DisplayCharOut_Attribute
66; DisplayCharOut_Character
67; DisplayCharOut_CharacterWithAttribute
68;   Parameters:
69;       AL:     Character to output
70;       AH:     Attribute to output
[42]71;       DS:     BDA segment (zero)
[41]72;       ES:DI:  Ptr to video memory where to output
73;   Returns:
74;       DI:     Incremented for next character
75;   Corrupts registers:
[42]76;       AX, DX
[41]77;--------------------------------------------------------------------
[369]78ALIGN DISPLAY_JUMP_ALIGN
[41]79DisplayCharOut_Attribute:
80    xchg    al, ah              ; Swap character and attribute
81    inc     di                  ; Skip character
[42]82    WAIT_RETRACE_IF_NECESSARY_THEN stosb
[41]83    ret
84
[369]85ALIGN DISPLAY_JUMP_ALIGN
[41]86DisplayCharOut_Character:
[42]87    WAIT_RETRACE_IF_NECESSARY_THEN stosb
[41]88    inc     di                  ; Skip attribute
89    ret
90
[369]91ALIGN DISPLAY_JUMP_ALIGN
[41]92DisplayCharOut_CharacterWithAttribute:
[42]93    WAIT_RETRACE_IF_NECESSARY_THEN stosw
[41]94    ret
95
96
97;--------------------------------------------------------------------
98; DisplayCharOut_WriteCharacterToBuffer
99;   Parameters:
100;       AL:     Character to output
101;       DS:     BDA segment (zero)
102;       ES:DI:  Ptr to destination string buffer
[55]103;       DISPLAY_CONTEXT.wCharOutParam:  Characters left in buffer
[41]104;   Returns:
105;       ES:DI:  Updated for next character
106;   Corrupts registers:
107;       AX, DX
108;--------------------------------------------------------------------
[369]109ALIGN DISPLAY_JUMP_ALIGN
[41]110DisplayCharOut_WriteCharacterToBuffer:
[55]111    cmp     WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam], BYTE 0
112    je      SHORT .BufferFull
[41]113    stosb
[55]114    dec     WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam]
[41]115.BufferFull:
116    ret
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