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