| 1 | ; File name : Display.asm
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| 2 | ; Project name : Assembly Library
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| 3 | ; Created date : 26.6.2010
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| 4 | ; Last update : 10.8.2010
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| 5 | ; Author : Tomi Tilli
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| 6 | ; Description : Functions for display output.
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| 7 |
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| 8 | ; Section containing code
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| 9 | SECTION .text
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| 10 |
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| 11 | ;--------------------------------------------------------------------
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| 12 | ; Supports following formatting types:
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| 13 | ; %a Specifies attribute for next character
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| 14 | ; %A Specifies attribute for remaining string (or until next %A)
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| 15 | ; %d Prints signed 16-bit decimal integer
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| 16 | ; %u Prints unsigned 16-bit decimal integer
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| 17 | ; %x Prints 16-bit hexadecimal integer
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| 18 | ; %s Prints string (from CS segment)
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| 19 | ; %S Prints string (far pointer)
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| 20 | ; %c Prints character
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| 21 | ; %t Prints character number of times (character needs to be pushed first, then repeat times)
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| 22 | ; %% Prints '%' character (no parameter pushed)
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| 23 | ;
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| 24 | ; Any placeholder can be set to minimum length by specifying
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| 25 | ; minimum number of characters. For example %8d would append spaces
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| 26 | ; after integer so that at least 8 characters would be printed.
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| 27 | ;
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| 28 | ; DisplayPrint_FormattedNullTerminatedStringFromCSSI
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| 29 | ; Parameters:
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| 30 | ; BP: SP before pushing parameters
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| 31 | ; DS: BDA segment (zero)
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| 32 | ; CS:SI: Pointer to string to format
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| 33 | ; ES:DI: Ptr to cursor location in video RAM
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| 34 | ; Stack: Parameters for formatting placeholders.
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| 35 | ; Parameter for first placeholder must be pushed first.
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| 36 | ; Low word must pushed first for placeholders requiring
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| 37 | ; 32-bit parameters (two words).
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| 38 | ; Returns:
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| 39 | ; DI: Updated offset to video RAM
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| 40 | ; Corrupts registers:
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| 41 | ; AX, DX
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| 42 | ;--------------------------------------------------------------------
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| 43 | ALIGN JUMP_ALIGN
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| 44 | DisplayPrint_FormattedNullTerminatedStringFromCSSI:
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| 45 | push bp
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| 46 | push si
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| 47 | push cx
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| 48 | push bx
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| 49 | push WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute]
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| 50 |
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| 51 | dec bp ; Point BP to...
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| 52 | dec bp ; ...first stack parameter
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| 53 | call DisplayFormat_ParseCharacters
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| 54 |
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| 55 | ; Pop original character attribute
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| 56 | pop ax
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| 57 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], al
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| 58 |
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| 59 | pop bx
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| 60 | pop cx
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| 61 | pop si
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| 62 | pop bp
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| 63 | ret
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| 64 |
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| 65 |
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| 66 | ;--------------------------------------------------------------------
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| 67 | ; DisplayPrint_SignedDecimalIntegerFromAX
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| 68 | ; Parameters:
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| 69 | ; AX: Word to display
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| 70 | ; DS: BDA segment (zero)
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| 71 | ; ES:DI: Ptr to cursor location in video RAM
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| 72 | ; Returns:
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| 73 | ; BX: Number of characters printed
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| 74 | ; DI: Updated offset to video RAM
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| 75 | ; Corrupts registers:
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| 76 | ; AX, DX
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| 77 | ;--------------------------------------------------------------------
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| 78 | ALIGN JUMP_ALIGN
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| 79 | DisplayPrint_SignedDecimalIntegerFromAX:
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| 80 | mov bx, 10
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| 81 | test ah, 1<<7 ; Sign bit set?
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| 82 | jz SHORT DisplayPrint_WordFromAXWithBaseInBX
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| 83 |
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| 84 | push ax
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| 85 | mov al, '-'
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| 86 | call DisplayPrint_CharacterFromAL
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| 87 | pop ax
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| 88 | neg ax
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| 89 | call DisplayPrint_WordFromAXWithBaseInBX
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| 90 | inc bx ; Increment character count for '-'
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| 91 | ret
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| 92 |
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| 93 |
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| 94 | ;--------------------------------------------------------------------
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| 95 | ; DisplayPrint_WordFromAXWithBaseInBX
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| 96 | ; Parameters:
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| 97 | ; AX: Word to display
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| 98 | ; BX: Integer base (binary=2, octal=8, decimal=10, hexadecimal=16)
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| 99 | ; DS: BDA segment (zero)
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| 100 | ; ES:DI: Ptr to cursor location in video RAM
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| 101 | ; Returns:
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| 102 | ; BX: Number of characters printed
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| 103 | ; DI: Updated offset to video RAM
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| 104 | ; Corrupts registers:
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| 105 | ; AX, DX
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| 106 | ;--------------------------------------------------------------------
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| 107 | ALIGN JUMP_ALIGN
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| 108 | DisplayPrint_WordFromAXWithBaseInBX:
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| 109 | push cx
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| 110 |
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| 111 | xor cx, cx
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| 112 | ALIGN JUMP_ALIGN
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| 113 | .DivideLoop:
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| 114 | xor dx, dx ; DX:AX now holds the integer
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| 115 | div bx ; Divide DX:AX by base
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| 116 | push dx ; Push remainder
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| 117 | inc cx ; Increment character count
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| 118 | test ax, ax ; All divided?
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| 119 | jnz SHORT .DivideLoop ; If not, loop
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| 120 | mov dx, cx ; Character count to DX
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| 121 | ALIGN JUMP_ALIGN
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| 122 | .PrintLoop:
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| 123 | pop bx ; Pop digit
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| 124 | mov al, [cs:bx+.rgcDigitToCharacter]
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| 125 | call DisplayPrint_CharacterFromAL
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| 126 | loop .PrintLoop
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| 127 | mov bx, dx ; Return characters printed
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| 128 |
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| 129 | pop cx
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| 130 | ret
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| 131 | .rgcDigitToCharacter: db "0123456789ABCDEF"
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| 132 |
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| 133 |
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| 134 | ;--------------------------------------------------------------------
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| 135 | ; DisplayPrint_CharacterBufferFromBXSIwithLengthInCX
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| 136 | ; Parameters:
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| 137 | ; CX: Buffer length (characters)
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| 138 | ; BX:SI: Ptr to NULL terminated string
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| 139 | ; DS: BDA segment (zero)
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| 140 | ; ES:DI: Ptr to cursor location in video RAM
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| 141 | ; Returns:
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| 142 | ; BX: Number of characters printed
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| 143 | ; DI: Updated offset to video RAM
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| 144 | ; Corrupts registers:
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| 145 | ; AX, DX
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| 146 | ;--------------------------------------------------------------------
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| 147 | ALIGN JUMP_ALIGN
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| 148 | DisplayPrint_CharacterBufferFromBXSIwithLengthInCX:
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| 149 | push cx
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| 150 |
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| 151 | mov es, bx ; Buffer now in ES:SI
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| 152 | xor bx, bx ; Zero character counter
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| 153 | jcxz .BufferPrinted
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| 154 | ALIGN JUMP_ALIGN
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| 155 | .CharacterOutputLoop:
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| 156 | mov al, [es:bx+si]
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| 157 | inc bx
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| 158 | call LoadDisplaySegmentAndPrintCharacterFromAL
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| 159 | loop .CharacterOutputLoop
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| 160 | .BufferPrinted:
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| 161 | mov es, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2]
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| 162 | pop cx
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| 163 | ret
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| 164 |
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| 165 |
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| 166 | ;--------------------------------------------------------------------
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| 167 | ; DisplayPrint_NullTerminatedStringFromCSSI
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| 168 | ; Parameters:
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| 169 | ; CS:SI: Ptr to NULL terminated string
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| 170 | ; DS: BDA segment (zero)
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| 171 | ; ES:DI: Ptr to cursor location in video RAM
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| 172 | ; Returns:
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| 173 | ; BX: Number of characters printed
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| 174 | ; DI: Updated offset to video RAM
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| 175 | ; Corrupts registers:
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| 176 | ; AX, DX
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| 177 | ;--------------------------------------------------------------------
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| 178 | ALIGN JUMP_ALIGN
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| 179 | DisplayPrint_NullTerminatedStringFromCSSI:
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| 180 | mov bx, cs
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| 181 | ; Fall to DisplayPrint_NullTerminatedStringFromBXSI
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| 182 |
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| 183 | ;--------------------------------------------------------------------
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| 184 | ; DisplayPrint_NullTerminatedStringFromBXSI
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| 185 | ; Parameters:
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| 186 | ; DS: BDA segment (zero)
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| 187 | ; BX:SI: Ptr to NULL terminated string
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| 188 | ; ES:DI: Ptr to cursor location in video RAM
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| 189 | ; Returns:
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| 190 | ; BX: Number of characters printed
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| 191 | ; DI: Updated offset to video RAM
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| 192 | ; Corrupts registers:
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| 193 | ; AX, DX
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| 194 | ;--------------------------------------------------------------------
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| 195 | ALIGN JUMP_ALIGN
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| 196 | DisplayPrint_NullTerminatedStringFromBXSI:
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| 197 | mov es, bx ; String now in ES:SI
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| 198 | xor bx, bx ; Zero character counter
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| 199 | ALIGN JUMP_ALIGN
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| 200 | .CharacterOutputLoop:
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| 201 | mov al, [es:bx+si]
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| 202 | test al, al
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| 203 | jz SHORT .AllCharacterPrinted
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| 204 | inc bx
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| 205 |
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| 206 | call LoadDisplaySegmentAndPrintCharacterFromAL
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| 207 | jmp SHORT .CharacterOutputLoop
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| 208 | ALIGN JUMP_ALIGN
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| 209 | .AllCharacterPrinted:
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| 210 | mov es, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2]
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| 211 | ret
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| 212 |
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| 213 | ;--------------------------------------------------------------------
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| 214 | ; LoadDisplaySegmentAndPrintCharacterFromAL
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| 215 | ; Parameters:
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| 216 | ; AL: Character to print
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| 217 | ; DI: Offset to cursor location in video RAM
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| 218 | ; DS: BDA segment (zero)
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| 219 | ; Returns:
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| 220 | ; DI: Updated offset to video RAM
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| 221 | ; Corrupts registers:
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| 222 | ; AX, DX
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| 223 | ;--------------------------------------------------------------------
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| 224 | ALIGN JUMP_ALIGN
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| 225 | LoadDisplaySegmentAndPrintCharacterFromAL:
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| 226 | push es
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| 227 | mov es, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2]
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| 228 | call DisplayPrint_CharacterFromAL
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| 229 | pop es
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| 230 | ret
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| 231 |
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| 232 |
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| 233 | ;--------------------------------------------------------------------
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| 234 | ; DisplayPrint_Newline
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| 235 | ; Parameters:
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| 236 | ; DS: BDA segment (zero)
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| 237 | ; ES:DI: Ptr to cursor location in video RAM
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| 238 | ; Returns:
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| 239 | ; DI: Updated offset to video RAM
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| 240 | ; Corrupts registers:
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| 241 | ; AX, DX
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| 242 | ;--------------------------------------------------------------------
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| 243 | ALIGN JUMP_ALIGN
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| 244 | DisplayPrint_Newline:
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| 245 | mov al, CR
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| 246 | call DisplayPrint_CharacterFromAL
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| 247 | mov al, LF
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| 248 | jmp SHORT DisplayPrint_CharacterFromAL
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| 249 |
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| 250 |
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| 251 | ;--------------------------------------------------------------------
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| 252 | ; DisplayPrint_RepeatCharacterFromALwithCountInCX
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| 253 | ; Parameters:
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| 254 | ; AL: Character to display
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| 255 | ; CX: Repeat count
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| 256 | ; DS: BDA segment (zero)
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| 257 | ; ES:DI: Ptr to cursor location in video RAM
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| 258 | ; Returns:
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| 259 | ; DI: Updated offset to video RAM
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| 260 | ; Corrupts registers:
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| 261 | ; AX, DX
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| 262 | ;--------------------------------------------------------------------
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| 263 | ALIGN JUMP_ALIGN
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| 264 | DisplayPrint_RepeatCharacterFromALwithCountInCX:
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| 265 | push ax
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| 266 | call DisplayPrint_CharacterFromAL
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| 267 | pop ax
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| 268 | loop DisplayPrint_RepeatCharacterFromALwithCountInCX
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| 269 | ret
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| 270 |
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| 271 |
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| 272 | ;--------------------------------------------------------------------
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| 273 | ; DisplayPrint_CharacterFromAL
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| 274 | ; Parameters:
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| 275 | ; AL: Character to display
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| 276 | ; DS: BDA segment (zero)
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| 277 | ; ES:DI: Ptr to cursor location in video RAM
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| 278 | ; Returns:
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| 279 | ; DI: Updated offset to video RAM
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| 280 | ; Corrupts registers:
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| 281 | ; AX, DX
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| 282 | ;--------------------------------------------------------------------
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| 283 | ALIGN JUMP_ALIGN
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| 284 | DisplayPrint_CharacterFromAL:
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| 285 | mov ah, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute]
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| 286 | jmp [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut]
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| 287 |
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| 288 |
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| 289 | ;--------------------------------------------------------------------
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| 290 | ; DisplayPrint_ClearScreen
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| 291 | ; Parameters:
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| 292 | ; DS: BDA segment (zero)
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| 293 | ; ES:DI: Ptr to cursor location in video RAM
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| 294 | ; Returns:
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| 295 | ; Nothing
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| 296 | ; Corrupts registers:
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| 297 | ; AX, DX
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| 298 | ;--------------------------------------------------------------------
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| 299 | ALIGN JUMP_ALIGN
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| 300 | DisplayPrint_ClearScreen:
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| 301 | push di
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| 302 | xor ax, ax
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| 303 | call DisplayCursor_SetCoordinatesFromAX
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| 304 | call DisplayPage_GetColumnsToALandRowsToAH
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| 305 | call DisplayPrint_ClearAreaWithHeightInAHandWidthInAL
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| 306 | pop di
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| 307 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], di
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| 308 | ret
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| 309 |
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| 310 |
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| 311 | ;--------------------------------------------------------------------
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| 312 | ; DisplayPrint_ClearAreaWithHeightInAHandWidthInAL
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| 313 | ; Parameters:
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| 314 | ; AH: Area height
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| 315 | ; AL: Area width
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| 316 | ; DS: BDA segment (zero)
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| 317 | ; ES:DI: Ptr to cursor location in video RAM
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| 318 | ; Returns:
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| 319 | ; Nothing
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| 320 | ; Corrupts registers:
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| 321 | ; AX, DX
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| 322 | ;--------------------------------------------------------------------
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| 323 | ALIGN JUMP_ALIGN
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| 324 | DisplayPrint_ClearAreaWithHeightInAHandWidthInAL:
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| 325 | push cx
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| 326 | push bx
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| 327 | push di
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| 328 |
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| 329 | xchg bx, ax ; Move parameters to BX
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| 330 | call DisplayCursor_GetSoftwareCoordinatesToAX
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| 331 | xchg dx, ax ; Coordinates now in DX
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| 332 | xor cx, cx ; Zero CX
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| 333 |
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| 334 | ALIGN JUMP_ALIGN
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| 335 | .ClearRowFromArea:
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| 336 | mov al, ' ' ; Clear with space
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| 337 | mov ah, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute]
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| 338 | mov cl, bl ; Area width = WORDs to clear
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| 339 | rep stosw
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| 340 | dec bh
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| 341 | jz SHORT .AreaCleared
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| 342 |
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| 343 | inc dh ; Increment row
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| 344 | push dx
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| 345 | xchg ax, dx
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| 346 | call DisplayCursor_SetCoordinatesFromAX
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| 347 | pop dx
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| 348 | jmp SHORT .ClearRowFromArea
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| 349 |
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| 350 | ALIGN JUMP_ALIGN
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| 351 | .AreaCleared:
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| 352 | pop di
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| 353 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], di
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| 354 | pop bx
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| 355 | pop cx
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| 356 | ret
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