[41] | 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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[67] | 4 | ; Last update : 7.12.2010 |
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[41] | 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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[48] | 27 | ; |
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| 28 | ; When placing '-' after number, then spaces will be used for prepending. |
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| 29 | ; For example %8-d would prepend integer with spaces so that at least |
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| 30 | ; 8 characters would be printed. |
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[41] | 31 | ; |
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| 32 | ; DisplayPrint_FormattedNullTerminatedStringFromCSSI |
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| 33 | ; Parameters: |
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| 34 | ; BP: SP before pushing parameters |
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| 35 | ; DS: BDA segment (zero) |
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| 36 | ; CS:SI: Pointer to string to format |
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| 37 | ; ES:DI: Ptr to cursor location in video RAM |
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| 38 | ; Stack: Parameters for formatting placeholders. |
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| 39 | ; Parameter for first placeholder must be pushed first. |
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| 40 | ; Low word must pushed first for placeholders requiring |
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| 41 | ; 32-bit parameters (two words). |
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| 42 | ; Returns: |
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| 43 | ; DI: Updated offset to video RAM |
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| 44 | ; Corrupts registers: |
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| 45 | ; AX, DX |
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| 46 | ;-------------------------------------------------------------------- |
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| 47 | ALIGN JUMP_ALIGN |
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| 48 | DisplayPrint_FormattedNullTerminatedStringFromCSSI: |
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| 49 | push bp |
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| 50 | push si |
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| 51 | push cx |
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| 52 | push bx |
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| 53 | push WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute] |
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| 54 | |
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| 55 | dec bp ; Point BP to... |
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| 56 | dec bp ; ...first stack parameter |
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| 57 | call DisplayFormat_ParseCharacters |
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| 58 | |
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| 59 | ; Pop original character attribute |
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| 60 | pop ax |
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| 61 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], al |
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| 62 | |
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| 63 | pop bx |
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| 64 | pop cx |
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| 65 | pop si |
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| 66 | pop bp |
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| 67 | ret |
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| 68 | |
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| 69 | |
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| 70 | ;-------------------------------------------------------------------- |
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[44] | 71 | ; DisplayPrint_SignedWordFromAXWithBaseInBX |
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[41] | 72 | ; Parameters: |
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| 73 | ; AX: Word to display |
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[44] | 74 | ; BX: Integer base (binary=2, octal=8, decimal=10, hexadecimal=16) |
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[41] | 75 | ; DS: BDA segment (zero) |
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| 76 | ; ES:DI: Ptr to cursor location in video RAM |
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| 77 | ; Returns: |
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| 78 | ; DI: Updated offset to video RAM |
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| 79 | ; Corrupts registers: |
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| 80 | ; AX, DX |
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| 81 | ;-------------------------------------------------------------------- |
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| 82 | ALIGN JUMP_ALIGN |
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[44] | 83 | DisplayPrint_SignedWordFromAXWithBaseInBX: |
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| 84 | test ax, ax |
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| 85 | jns SHORT DisplayPrint_WordFromAXWithBaseInBX |
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[41] | 86 | |
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| 87 | push ax |
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| 88 | mov al, '-' |
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| 89 | call DisplayPrint_CharacterFromAL |
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| 90 | pop ax |
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| 91 | neg ax |
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[44] | 92 | ; Fall to DisplayPrint_WordFromAXWithBaseInBX |
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[41] | 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 | ; DI: Updated offset to video RAM |
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| 103 | ; Corrupts registers: |
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| 104 | ; AX, DX |
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| 105 | ;-------------------------------------------------------------------- |
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| 106 | ALIGN JUMP_ALIGN |
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| 107 | DisplayPrint_WordFromAXWithBaseInBX: |
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| 108 | push cx |
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[44] | 109 | push bx |
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[41] | 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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[44] | 120 | |
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| 121 | mov bx, .rgcDigitToCharacter |
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[41] | 122 | ALIGN JUMP_ALIGN |
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[44] | 123 | .PrintNextDigit: |
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| 124 | pop ax ; Pop digit |
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| 125 | eSEG cs |
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| 126 | xlatb |
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[41] | 127 | call DisplayPrint_CharacterFromAL |
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[44] | 128 | loop .PrintNextDigit |
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[41] | 129 | |
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[44] | 130 | pop bx |
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[41] | 131 | pop cx |
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| 132 | ret |
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| 133 | .rgcDigitToCharacter: db "0123456789ABCDEF" |
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| 134 | |
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| 135 | |
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| 136 | ;-------------------------------------------------------------------- |
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| 137 | ; DisplayPrint_CharacterBufferFromBXSIwithLengthInCX |
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| 138 | ; Parameters: |
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| 139 | ; CX: Buffer length (characters) |
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| 140 | ; BX:SI: Ptr to NULL terminated string |
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| 141 | ; DS: BDA segment (zero) |
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| 142 | ; ES:DI: Ptr to cursor location in video RAM |
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| 143 | ; Returns: |
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| 144 | ; DI: Updated offset to video RAM |
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| 145 | ; Corrupts registers: |
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| 146 | ; AX, DX |
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| 147 | ;-------------------------------------------------------------------- |
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| 148 | ALIGN JUMP_ALIGN |
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| 149 | DisplayPrint_CharacterBufferFromBXSIwithLengthInCX: |
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[44] | 150 | jcxz .NothingToPrintSinceZeroLength |
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| 151 | push si |
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[41] | 152 | push cx |
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| 153 | |
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| 154 | ALIGN JUMP_ALIGN |
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[44] | 155 | .PrintNextCharacter: |
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| 156 | mov ds, bx |
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| 157 | lodsb |
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| 158 | LOAD_BDA_SEGMENT_TO ds, dx |
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| 159 | call DisplayPrint_CharacterFromAL |
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| 160 | loop .PrintNextCharacter |
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| 161 | |
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| 162 | LOAD_BDA_SEGMENT_TO ds, dx |
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[41] | 163 | pop cx |
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[44] | 164 | pop si |
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| 165 | .NothingToPrintSinceZeroLength: |
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[41] | 166 | ret |
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| 167 | |
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| 168 | |
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| 169 | ;-------------------------------------------------------------------- |
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| 170 | ; DisplayPrint_NullTerminatedStringFromCSSI |
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| 171 | ; Parameters: |
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| 172 | ; CS:SI: Ptr to NULL terminated string |
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| 173 | ; DS: BDA segment (zero) |
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| 174 | ; ES:DI: Ptr to cursor location in video RAM |
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| 175 | ; Returns: |
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| 176 | ; DI: Updated offset to video RAM |
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| 177 | ; Corrupts registers: |
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| 178 | ; AX, DX |
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| 179 | ;-------------------------------------------------------------------- |
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| 180 | ALIGN JUMP_ALIGN |
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| 181 | DisplayPrint_NullTerminatedStringFromCSSI: |
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[44] | 182 | push bx |
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[41] | 183 | mov bx, cs |
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[44] | 184 | call DisplayPrint_NullTerminatedStringFromBXSI |
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| 185 | pop bx |
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| 186 | ret |
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[41] | 187 | |
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[44] | 188 | |
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[41] | 189 | ;-------------------------------------------------------------------- |
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| 190 | ; DisplayPrint_NullTerminatedStringFromBXSI |
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| 191 | ; Parameters: |
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| 192 | ; DS: BDA segment (zero) |
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| 193 | ; BX:SI: Ptr to NULL terminated string |
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| 194 | ; ES:DI: Ptr to cursor location in video RAM |
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| 195 | ; Returns: |
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| 196 | ; DI: Updated offset to video RAM |
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| 197 | ; Corrupts registers: |
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| 198 | ; AX, DX |
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| 199 | ;-------------------------------------------------------------------- |
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| 200 | ALIGN JUMP_ALIGN |
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| 201 | DisplayPrint_NullTerminatedStringFromBXSI: |
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[44] | 202 | push si |
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| 203 | push cx |
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[41] | 204 | |
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[44] | 205 | xor cx, cx |
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[41] | 206 | ALIGN JUMP_ALIGN |
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[44] | 207 | .PrintNextCharacter: |
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| 208 | mov ds, bx ; String segment to DS |
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| 209 | lodsb |
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| 210 | mov ds, cx ; BDA segment to DS |
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| 211 | test al, al ; NULL? |
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| 212 | jz SHORT .EndOfString |
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| 213 | call DisplayPrint_CharacterFromAL |
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| 214 | jmp SHORT .PrintNextCharacter |
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[41] | 215 | |
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| 216 | ALIGN JUMP_ALIGN |
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[44] | 217 | .EndOfString: |
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| 218 | pop cx |
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| 219 | pop si |
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[41] | 220 | ret |
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| 221 | |
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| 222 | |
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| 223 | ;-------------------------------------------------------------------- |
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[67] | 224 | ; DisplayPrint_ClearScreenWithCharInALandAttributeInAH |
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[41] | 225 | ; Parameters: |
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[67] | 226 | ; AL: Character to clear with |
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| 227 | ; AH: Attribute to clear with |
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[41] | 228 | ; DS: BDA segment (zero) |
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| 229 | ; ES:DI: Ptr to cursor location in video RAM |
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| 230 | ; Returns: |
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| 231 | ; Nothing |
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| 232 | ; Corrupts registers: |
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| 233 | ; AX, DX |
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| 234 | ;-------------------------------------------------------------------- |
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| 235 | ALIGN JUMP_ALIGN |
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[67] | 236 | DisplayPrint_ClearScreenWithCharInALandAttributeInAH: |
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[41] | 237 | push di |
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[67] | 238 | push cx |
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| 239 | |
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| 240 | xchg cx, ax |
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[41] | 241 | xor ax, ax |
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[67] | 242 | call DisplayCursor_SetCoordinatesFromAX ; Updates DI |
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[41] | 243 | call DisplayPage_GetColumnsToALandRowsToAH |
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[67] | 244 | mul ah ; AX = AL*AH = Characters on screen |
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| 245 | xchg cx, ax ; AX = Char+Attr, CX = WORDs to store |
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| 246 | rep stosw |
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| 247 | |
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| 248 | pop cx |
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[41] | 249 | pop di |
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| 250 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], di |
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| 251 | ret |
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| 252 | |
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| 253 | |
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| 254 | ;-------------------------------------------------------------------- |
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| 255 | ; DisplayPrint_ClearAreaWithHeightInAHandWidthInAL |
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| 256 | ; Parameters: |
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| 257 | ; AH: Area height |
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| 258 | ; AL: Area width |
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| 259 | ; DS: BDA segment (zero) |
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| 260 | ; ES:DI: Ptr to cursor location in video RAM |
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| 261 | ; Returns: |
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[42] | 262 | ; DI: Updated offset to video RAM |
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[41] | 263 | ; Corrupts registers: |
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| 264 | ; AX, DX |
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| 265 | ;-------------------------------------------------------------------- |
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| 266 | ALIGN JUMP_ALIGN |
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| 267 | DisplayPrint_ClearAreaWithHeightInAHandWidthInAL: |
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[42] | 268 | push si |
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[41] | 269 | push cx |
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| 270 | push bx |
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| 271 | |
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[42] | 272 | xchg bx, ax ; Area size to BX |
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[41] | 273 | call DisplayCursor_GetSoftwareCoordinatesToAX |
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[42] | 274 | xchg si, ax ; Software (Y,X) coordinates now in SI |
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| 275 | xor cx, cx |
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[41] | 276 | |
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| 277 | ALIGN JUMP_ALIGN |
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[42] | 278 | .ClearRowLoop: |
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| 279 | mov cl, bl ; Area width now in CX |
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[44] | 280 | mov al, SCREEN_BACKGROUND_CHARACTER |
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[42] | 281 | call DisplayPrint_RepeatCharacterFromALwithCountInCX |
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[41] | 282 | |
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[42] | 283 | xchg ax, si ; Coordinates to AX |
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| 284 | inc ah ; Increment row |
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| 285 | mov si, ax |
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[41] | 286 | call DisplayCursor_SetCoordinatesFromAX |
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[42] | 287 | dec bh ; Decrement rows left |
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| 288 | jnz SHORT .ClearRowLoop |
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[41] | 289 | |
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| 290 | pop bx |
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| 291 | pop cx |
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[42] | 292 | pop si |
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[41] | 293 | ret |
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[42] | 294 | |
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| 295 | |
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| 296 | ;-------------------------------------------------------------------- |
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| 297 | ; DisplayPrint_RepeatCharacterFromALwithCountInCX |
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| 298 | ; Parameters: |
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| 299 | ; AL: Character to display |
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| 300 | ; CX: Repeat count |
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| 301 | ; DS: BDA segment (zero) |
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| 302 | ; ES:DI: Ptr to cursor location in video RAM |
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| 303 | ; Returns: |
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| 304 | ; DI: Updated offset to video RAM |
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| 305 | ; Corrupts registers: |
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| 306 | ; AX, DX |
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| 307 | ;-------------------------------------------------------------------- |
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| 308 | ALIGN JUMP_ALIGN |
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| 309 | DisplayPrint_RepeatCharacterFromALwithCountInCX: |
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[44] | 310 | jcxz .NothingToRepeat |
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| 311 | push cx |
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| 312 | |
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| 313 | ALIGN JUMP_ALIGN |
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| 314 | .RepeatCharacter: |
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[42] | 315 | push ax |
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| 316 | call DisplayPrint_CharacterFromAL |
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| 317 | pop ax |
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[44] | 318 | loop .RepeatCharacter |
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| 319 | |
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| 320 | pop cx |
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| 321 | .NothingToRepeat: |
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[42] | 322 | ret |
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| 323 | |
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| 324 | |
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| 325 | ;-------------------------------------------------------------------- |
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[44] | 326 | ; DisplayPrint_Newline |
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| 327 | ; Parameters: |
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| 328 | ; DS: BDA segment (zero) |
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| 329 | ; ES:DI: Ptr to cursor location in video RAM |
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| 330 | ; Returns: |
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| 331 | ; DI: Updated offset to video RAM |
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| 332 | ; Corrupts registers: |
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| 333 | ; AX, DX |
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| 334 | ;-------------------------------------------------------------------- |
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| 335 | ALIGN JUMP_ALIGN |
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| 336 | DisplayPrint_Newline: |
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[52] | 337 | mov al, LF |
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| 338 | call DisplayPrint_CharacterFromAL |
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[44] | 339 | mov al, CR |
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| 340 | ; Fall to DisplayPrint_CharacterFromAL |
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| 341 | |
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| 342 | ;-------------------------------------------------------------------- |
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[42] | 343 | ; DisplayPrint_CharacterFromAL |
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| 344 | ; Parameters: |
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| 345 | ; AL: Character to display |
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| 346 | ; DS: BDA segment (zero) |
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| 347 | ; ES:DI: Ptr to cursor location in video RAM |
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| 348 | ; Returns: |
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| 349 | ; DI: Updated offset to video RAM |
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| 350 | ; Corrupts registers: |
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| 351 | ; AX, DX |
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| 352 | ;-------------------------------------------------------------------- |
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| 353 | ALIGN JUMP_ALIGN |
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| 354 | DisplayPrint_CharacterFromAL: |
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| 355 | mov ah, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute] |
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| 356 | jmp [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut] |
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