| 1 | ; File name : DisplayCharOut.asm
|
|---|
| 2 | ; Project name : Assembly Library
|
|---|
| 3 | ; Created date : 26.6.2010
|
|---|
| 4 | ; Last update : 8.10.2010
|
|---|
| 5 | ; Author : Tomi Tilli
|
|---|
| 6 | ; Description : Functions for outputting characters to video memory.
|
|---|
| 7 | ; These functions are meant to be called by Display_CharacterFromAL
|
|---|
| 8 | ; and Display_RepeatCharacterFromAL using function pointer
|
|---|
| 9 | ; stored in DISPLAY_CONTEXT.
|
|---|
| 10 |
|
|---|
| 11 | ; Section containing code
|
|---|
| 12 | SECTION .text
|
|---|
| 13 |
|
|---|
| 14 | ;--------------------------------------------------------------------
|
|---|
| 15 | ; DisplayCharOut_TeletypeOutputWithAttribute
|
|---|
| 16 | ; DisplayCharOut_TeletypeOutput
|
|---|
| 17 | ; Parameters:
|
|---|
| 18 | ; AL: Character to output
|
|---|
| 19 | ; AH: Attribute to output
|
|---|
| 20 | ; DS: BDA segment (zero)
|
|---|
| 21 | ; ES:DI: Ptr to video memory where to output
|
|---|
| 22 | ; Returns:
|
|---|
| 23 | ; DI: Incremented for next character
|
|---|
| 24 | ; Corrupts registers:
|
|---|
| 25 | ; AX, DX
|
|---|
| 26 | ;--------------------------------------------------------------------
|
|---|
| 27 | ALIGN JUMP_ALIGN
|
|---|
| 28 | DisplayCharOut_TeletypeOutputWithAttribute:
|
|---|
| 29 | cmp al, ' ' ; Printable character?
|
|---|
| 30 | jb SHORT DisplayCharOut_BiosTeletypeOutput
|
|---|
| 31 | WAIT_RETRACE_IF_NECESSARY_THEN stosw
|
|---|
| 32 | ret
|
|---|
| 33 |
|
|---|
| 34 | ALIGN JUMP_ALIGN
|
|---|
| 35 | DisplayCharOut_TeletypeOutput:
|
|---|
| 36 | cmp al, ' ' ; Printable character?
|
|---|
| 37 | jae SHORT DisplayCharOut_Character
|
|---|
| 38 | ; Fall to DisplayCharOut_BiosTeletypeOutput
|
|---|
| 39 |
|
|---|
| 40 | ;--------------------------------------------------------------------
|
|---|
| 41 | ; DisplayCharOut_BiosTeletypeOutput
|
|---|
| 42 | ; Parameters:
|
|---|
| 43 | ; AL: Control character
|
|---|
| 44 | ; DS: BDA segment (zero)
|
|---|
| 45 | ; ES:DI: Ptr to video memory where to output
|
|---|
| 46 | ; Returns:
|
|---|
| 47 | ; DI: Incremented for next character
|
|---|
| 48 | ; Corrupts registers:
|
|---|
| 49 | ; AX, DX
|
|---|
| 50 | ;--------------------------------------------------------------------
|
|---|
| 51 | ALIGN JUMP_ALIGN
|
|---|
| 52 | DisplayCharOut_BiosTeletypeOutput:
|
|---|
| 53 | push ax
|
|---|
| 54 | call DisplayCursor_SynchronizeCoordinatesToHardware
|
|---|
| 55 | pop ax
|
|---|
| 56 | call .OutputCharacterWithBIOS
|
|---|
| 57 | call DisplayCursor_GetHardwareCoordinatesToAX
|
|---|
| 58 | jmp DisplayCursor_SetCoordinatesFromAX
|
|---|
| 59 |
|
|---|
| 60 | ;--------------------------------------------------------------------
|
|---|
| 61 | ; .OutputCharacterWithBIOS
|
|---|
| 62 | ; Parameters:
|
|---|
| 63 | ; AL: Character to output
|
|---|
| 64 | ; DS: BDA segment
|
|---|
| 65 | ; Returns:
|
|---|
| 66 | ; Nothing
|
|---|
| 67 | ; Corrupts registers:
|
|---|
| 68 | ; AX
|
|---|
| 69 | ;--------------------------------------------------------------------
|
|---|
| 70 | ALIGN JUMP_ALIGN
|
|---|
| 71 | .OutputCharacterWithBIOS:
|
|---|
| 72 | push bx
|
|---|
| 73 | mov ah, TELETYPE_OUTPUT
|
|---|
| 74 | mov bh, [VIDEO_BDA.bActivePage]
|
|---|
| 75 | int BIOS_VIDEO_INTERRUPT_10h
|
|---|
| 76 | pop bx
|
|---|
| 77 | ret
|
|---|
| 78 |
|
|---|
| 79 |
|
|---|
| 80 | ;--------------------------------------------------------------------
|
|---|
| 81 | ; DisplayCharOut_Attribute
|
|---|
| 82 | ; DisplayCharOut_Character
|
|---|
| 83 | ; DisplayCharOut_CharacterWithAttribute
|
|---|
| 84 | ; Parameters:
|
|---|
| 85 | ; AL: Character to output
|
|---|
| 86 | ; AH: Attribute to output
|
|---|
| 87 | ; DS: BDA segment (zero)
|
|---|
| 88 | ; ES:DI: Ptr to video memory where to output
|
|---|
| 89 | ; Returns:
|
|---|
| 90 | ; DI: Incremented for next character
|
|---|
| 91 | ; Corrupts registers:
|
|---|
| 92 | ; AX, DX
|
|---|
| 93 | ;--------------------------------------------------------------------
|
|---|
| 94 | ALIGN JUMP_ALIGN
|
|---|
| 95 | DisplayCharOut_Attribute:
|
|---|
| 96 | xchg al, ah ; Swap character and attribute
|
|---|
| 97 | inc di ; Skip character
|
|---|
| 98 | WAIT_RETRACE_IF_NECESSARY_THEN stosb
|
|---|
| 99 | ret
|
|---|
| 100 |
|
|---|
| 101 | ALIGN JUMP_ALIGN
|
|---|
| 102 | DisplayCharOut_Character:
|
|---|
| 103 | WAIT_RETRACE_IF_NECESSARY_THEN stosb
|
|---|
| 104 | inc di ; Skip attribute
|
|---|
| 105 | ret
|
|---|
| 106 |
|
|---|
| 107 | ALIGN JUMP_ALIGN
|
|---|
| 108 | DisplayCharOut_CharacterWithAttribute:
|
|---|
| 109 | WAIT_RETRACE_IF_NECESSARY_THEN stosw
|
|---|
| 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
|
|---|
| 119 | ; DISPLAY_CONTEXT.wCharOutParam: Offset to end of buffer (one past last)
|
|---|
| 120 | ; Returns:
|
|---|
| 121 | ; ES:DI: Updated for next character
|
|---|
| 122 | ; Corrupts registers:
|
|---|
| 123 | ; AX, DX
|
|---|
| 124 | ;--------------------------------------------------------------------
|
|---|
| 125 | ALIGN JUMP_ALIGN
|
|---|
| 126 | DisplayCharOut_WriteCharacterToBuffer:
|
|---|
| 127 | cmp di, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam]
|
|---|
| 128 | jae SHORT .BufferFull
|
|---|
| 129 | stosb
|
|---|
| 130 | .BufferFull:
|
|---|
| 131 | ret
|
|---|
