| 1 | ; File name : Display.asm
|
|---|
| 2 | ; Project name : Assembly Library
|
|---|
| 3 | ; Created date : 26.6.2010
|
|---|
| 4 | ; Last update : 18.9.2010
|
|---|
| 5 | ; Author : Tomi Tilli
|
|---|
| 6 | ; Description : Functions for display output.
|
|---|
| 7 |
|
|---|
| 8 | ; Section containing code
|
|---|
| 9 | SECTION .text
|
|---|
| 10 |
|
|---|
| 11 | ;--------------------------------------------------------------------
|
|---|
| 12 | ; Supports following formatting types:
|
|---|
| 13 | ; %a Specifies attribute for next character
|
|---|
| 14 | ; %A Specifies attribute for remaining string (or until next %A)
|
|---|
| 15 | ; %d Prints signed 16-bit decimal integer
|
|---|
| 16 | ; %u Prints unsigned 16-bit decimal integer
|
|---|
| 17 | ; %x Prints 16-bit hexadecimal integer
|
|---|
| 18 | ; %s Prints string (from CS segment)
|
|---|
| 19 | ; %S Prints string (far pointer)
|
|---|
| 20 | ; %c Prints character
|
|---|
| 21 | ; %t Prints character number of times (character needs to be pushed first, then repeat times)
|
|---|
| 22 | ; %% Prints '%' character (no parameter pushed)
|
|---|
| 23 | ;
|
|---|
| 24 | ; Any placeholder can be set to minimum length by specifying
|
|---|
| 25 | ; minimum number of characters. For example %8d would append spaces
|
|---|
| 26 | ; after integer so that at least 8 characters would be printed.
|
|---|
| 27 | ;
|
|---|
| 28 | ; DisplayPrint_FormattedNullTerminatedStringFromCSSI
|
|---|
| 29 | ; Parameters:
|
|---|
| 30 | ; BP: SP before pushing parameters
|
|---|
| 31 | ; DS: BDA segment (zero)
|
|---|
| 32 | ; CS:SI: Pointer to string to format
|
|---|
| 33 | ; ES:DI: Ptr to cursor location in video RAM
|
|---|
| 34 | ; Stack: Parameters for formatting placeholders.
|
|---|
| 35 | ; Parameter for first placeholder must be pushed first.
|
|---|
| 36 | ; Low word must pushed first for placeholders requiring
|
|---|
| 37 | ; 32-bit parameters (two words).
|
|---|
| 38 | ; Returns:
|
|---|
| 39 | ; DI: Updated offset to video RAM
|
|---|
| 40 | ; Corrupts registers:
|
|---|
| 41 | ; AX, DX
|
|---|
| 42 | ;--------------------------------------------------------------------
|
|---|
| 43 | ALIGN JUMP_ALIGN
|
|---|
| 44 | DisplayPrint_FormattedNullTerminatedStringFromCSSI:
|
|---|
| 45 | push bp
|
|---|
| 46 | push si
|
|---|
| 47 | push cx
|
|---|
| 48 | push bx
|
|---|
| 49 | push WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute]
|
|---|
| 50 |
|
|---|
| 51 | dec bp ; Point BP to...
|
|---|
| 52 | dec bp ; ...first stack parameter
|
|---|
| 53 | call DisplayFormat_ParseCharacters
|
|---|
| 54 |
|
|---|
| 55 | ; Pop original character attribute
|
|---|
| 56 | pop ax
|
|---|
| 57 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], al
|
|---|
| 58 |
|
|---|
| 59 | pop bx
|
|---|
| 60 | pop cx
|
|---|
| 61 | pop si
|
|---|
| 62 | pop bp
|
|---|
| 63 | ret
|
|---|
| 64 |
|
|---|
| 65 |
|
|---|
| 66 | ;--------------------------------------------------------------------
|
|---|
| 67 | ; DisplayPrint_SignedDecimalIntegerFromAX
|
|---|
| 68 | ; Parameters:
|
|---|
| 69 | ; AX: Word to display
|
|---|
| 70 | ; DS: BDA segment (zero)
|
|---|
| 71 | ; ES:DI: Ptr to cursor location in video RAM
|
|---|
| 72 | ; Returns:
|
|---|
| 73 | ; BX: Number of characters printed
|
|---|
| 74 | ; DI: Updated offset to video RAM
|
|---|
| 75 | ; Corrupts registers:
|
|---|
| 76 | ; AX, DX
|
|---|
| 77 | ;--------------------------------------------------------------------
|
|---|
| 78 | ALIGN JUMP_ALIGN
|
|---|
| 79 | DisplayPrint_SignedDecimalIntegerFromAX:
|
|---|
| 80 | mov bx, 10
|
|---|
| 81 | test ah, 1<<7 ; Sign bit set?
|
|---|
| 82 | jz SHORT DisplayPrint_WordFromAXWithBaseInBX
|
|---|
| 83 |
|
|---|
| 84 | push ax
|
|---|
| 85 | mov al, '-'
|
|---|
| 86 | call DisplayPrint_CharacterFromAL
|
|---|
| 87 | pop ax
|
|---|
| 88 | neg ax
|
|---|
| 89 | call DisplayPrint_WordFromAXWithBaseInBX
|
|---|
| 90 | inc bx ; Increment character count for '-'
|
|---|
| 91 | ret
|
|---|
| 92 |
|
|---|
| 93 |
|
|---|
| 94 | ;--------------------------------------------------------------------
|
|---|
| 95 | ; DisplayPrint_WordFromAXWithBaseInBX
|
|---|
| 96 | ; Parameters:
|
|---|
| 97 | ; AX: Word to display
|
|---|
| 98 | ; BX: Integer base (binary=2, octal=8, decimal=10, hexadecimal=16)
|
|---|
| 99 | ; DS: BDA segment (zero)
|
|---|
| 100 | ; ES:DI: Ptr to cursor location in video RAM
|
|---|
| 101 | ; Returns:
|
|---|
| 102 | ; BX: Number of characters printed
|
|---|
| 103 | ; DI: Updated offset to video RAM
|
|---|
| 104 | ; Corrupts registers:
|
|---|
| 105 | ; AX, DX
|
|---|
| 106 | ;--------------------------------------------------------------------
|
|---|
| 107 | ALIGN JUMP_ALIGN
|
|---|
| 108 | DisplayPrint_WordFromAXWithBaseInBX:
|
|---|
| 109 | push cx
|
|---|
| 110 |
|
|---|
| 111 | xor cx, cx
|
|---|
| 112 | ALIGN JUMP_ALIGN
|
|---|
| 113 | .DivideLoop:
|
|---|
| 114 | xor dx, dx ; DX:AX now holds the integer
|
|---|
| 115 | div bx ; Divide DX:AX by base
|
|---|
| 116 | push dx ; Push remainder
|
|---|
| 117 | inc cx ; Increment character count
|
|---|
| 118 | test ax, ax ; All divided?
|
|---|
| 119 | jnz SHORT .DivideLoop ; If not, loop
|
|---|
| 120 | mov dx, cx ; Character count to DX
|
|---|
| 121 | ALIGN JUMP_ALIGN
|
|---|
| 122 | .PrintLoop:
|
|---|
| 123 | pop bx ; Pop digit
|
|---|
| 124 | mov al, [cs:bx+.rgcDigitToCharacter]
|
|---|
| 125 | call DisplayPrint_CharacterFromAL
|
|---|
| 126 | loop .PrintLoop
|
|---|
| 127 | mov bx, dx ; Return characters printed
|
|---|
| 128 |
|
|---|
| 129 | pop cx
|
|---|
| 130 | ret
|
|---|
| 131 | .rgcDigitToCharacter: db "0123456789ABCDEF"
|
|---|
| 132 |
|
|---|
| 133 |
|
|---|
| 134 | ;--------------------------------------------------------------------
|
|---|
| 135 | ; DisplayPrint_CharacterBufferFromBXSIwithLengthInCX
|
|---|
| 136 | ; Parameters:
|
|---|
| 137 | ; CX: Buffer length (characters)
|
|---|
| 138 | ; BX:SI: Ptr to NULL terminated string
|
|---|
| 139 | ; DS: BDA segment (zero)
|
|---|
| 140 | ; ES:DI: Ptr to cursor location in video RAM
|
|---|
| 141 | ; Returns:
|
|---|
| 142 | ; BX: Number of characters printed
|
|---|
| 143 | ; DI: Updated offset to video RAM
|
|---|
| 144 | ; Corrupts registers:
|
|---|
| 145 | ; AX, DX
|
|---|
| 146 | ;--------------------------------------------------------------------
|
|---|
| 147 | ALIGN JUMP_ALIGN
|
|---|
| 148 | DisplayPrint_CharacterBufferFromBXSIwithLengthInCX:
|
|---|
| 149 | push cx
|
|---|
| 150 |
|
|---|
| 151 | mov es, bx ; Buffer now in ES:SI
|
|---|
| 152 | xor bx, bx ; Zero character counter
|
|---|
| 153 | jcxz .BufferPrinted
|
|---|
| 154 | ALIGN JUMP_ALIGN
|
|---|
| 155 | .CharacterOutputLoop:
|
|---|
| 156 | mov al, [es:bx+si]
|
|---|
| 157 | inc bx
|
|---|
| 158 | call LoadDisplaySegmentAndPrintCharacterFromAL
|
|---|
| 159 | loop .CharacterOutputLoop
|
|---|
| 160 | .BufferPrinted:
|
|---|
| 161 | mov es, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2]
|
|---|
| 162 | pop cx
|
|---|
| 163 | ret
|
|---|
| 164 |
|
|---|
| 165 |
|
|---|
| 166 | ;--------------------------------------------------------------------
|
|---|
| 167 | ; DisplayPrint_NullTerminatedStringFromCSSI
|
|---|
| 168 | ; Parameters:
|
|---|
| 169 | ; CS:SI: Ptr to NULL terminated string
|
|---|
| 170 | ; DS: BDA segment (zero)
|
|---|
| 171 | ; ES:DI: Ptr to cursor location in video RAM
|
|---|
| 172 | ; Returns:
|
|---|
| 173 | ; BX: Number of characters printed
|
|---|
| 174 | ; DI: Updated offset to video RAM
|
|---|
| 175 | ; Corrupts registers:
|
|---|
| 176 | ; AX, DX
|
|---|
| 177 | ;--------------------------------------------------------------------
|
|---|
| 178 | ALIGN JUMP_ALIGN
|
|---|
| 179 | DisplayPrint_NullTerminatedStringFromCSSI:
|
|---|
| 180 | mov bx, cs
|
|---|
| 181 | ; Fall to DisplayPrint_NullTerminatedStringFromBXSI
|
|---|
| 182 |
|
|---|
| 183 | ;--------------------------------------------------------------------
|
|---|
| 184 | ; DisplayPrint_NullTerminatedStringFromBXSI
|
|---|
| 185 | ; Parameters:
|
|---|
| 186 | ; DS: BDA segment (zero)
|
|---|
| 187 | ; BX:SI: Ptr to NULL terminated string
|
|---|
| 188 | ; ES:DI: Ptr to cursor location in video RAM
|
|---|
| 189 | ; Returns:
|
|---|
| 190 | ; BX: Number of characters printed
|
|---|
| 191 | ; DI: Updated offset to video RAM
|
|---|
| 192 | ; Corrupts registers:
|
|---|
| 193 | ; AX, DX
|
|---|
| 194 | ;--------------------------------------------------------------------
|
|---|
| 195 | ALIGN JUMP_ALIGN
|
|---|
| 196 | DisplayPrint_NullTerminatedStringFromBXSI:
|
|---|
| 197 | mov es, bx ; String now in ES:SI
|
|---|
| 198 | xor bx, bx ; Zero character counter
|
|---|
| 199 | ALIGN JUMP_ALIGN
|
|---|
| 200 | .CharacterOutputLoop:
|
|---|
| 201 | mov al, [es:bx+si]
|
|---|
| 202 | test al, al
|
|---|
| 203 | jz SHORT .AllCharacterPrinted
|
|---|
| 204 | inc bx
|
|---|
| 205 |
|
|---|
| 206 | call LoadDisplaySegmentAndPrintCharacterFromAL
|
|---|
| 207 | jmp SHORT .CharacterOutputLoop
|
|---|
| 208 | ALIGN JUMP_ALIGN
|
|---|
| 209 | .AllCharacterPrinted:
|
|---|
| 210 | mov es, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2]
|
|---|
| 211 | ret
|
|---|
| 212 |
|
|---|
| 213 | ;--------------------------------------------------------------------
|
|---|
| 214 | ; LoadDisplaySegmentAndPrintCharacterFromAL
|
|---|
| 215 | ; Parameters:
|
|---|
| 216 | ; AL: Character to print
|
|---|
| 217 | ; DI: Offset to cursor location in video RAM
|
|---|
| 218 | ; DS: BDA segment (zero)
|
|---|
| 219 | ; Returns:
|
|---|
| 220 | ; DI: Updated offset to video RAM
|
|---|
| 221 | ; Corrupts registers:
|
|---|
| 222 | ; AX, DX
|
|---|
| 223 | ;--------------------------------------------------------------------
|
|---|
| 224 | ALIGN JUMP_ALIGN
|
|---|
| 225 | LoadDisplaySegmentAndPrintCharacterFromAL:
|
|---|
| 226 | push es
|
|---|
| 227 | mov es, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2]
|
|---|
| 228 | call DisplayPrint_CharacterFromAL
|
|---|
| 229 | pop es
|
|---|
| 230 | ret
|
|---|
| 231 |
|
|---|
| 232 |
|
|---|
| 233 | ;--------------------------------------------------------------------
|
|---|
| 234 | ; DisplayPrint_Newline
|
|---|
| 235 | ; Parameters:
|
|---|
| 236 | ; DS: BDA segment (zero)
|
|---|
| 237 | ; ES:DI: Ptr to cursor location in video RAM
|
|---|
| 238 | ; Returns:
|
|---|
| 239 | ; DI: Updated offset to video RAM
|
|---|
| 240 | ; Corrupts registers:
|
|---|
| 241 | ; AX, DX
|
|---|
| 242 | ;--------------------------------------------------------------------
|
|---|
| 243 | ALIGN JUMP_ALIGN
|
|---|
| 244 | DisplayPrint_Newline:
|
|---|
| 245 | mov al, CR
|
|---|
| 246 | call DisplayPrint_CharacterFromAL
|
|---|
| 247 | mov al, LF
|
|---|
| 248 | jmp SHORT DisplayPrint_CharacterFromAL
|
|---|
| 249 |
|
|---|
| 250 |
|
|---|
| 251 | ;--------------------------------------------------------------------
|
|---|
| 252 | ; DisplayPrint_ClearScreen
|
|---|
| 253 | ; Parameters:
|
|---|
| 254 | ; DS: BDA segment (zero)
|
|---|
| 255 | ; ES:DI: Ptr to cursor location in video RAM
|
|---|
| 256 | ; Returns:
|
|---|
| 257 | ; Nothing
|
|---|
| 258 | ; Corrupts registers:
|
|---|
| 259 | ; AX, DX
|
|---|
| 260 | ;--------------------------------------------------------------------
|
|---|
| 261 | ALIGN JUMP_ALIGN
|
|---|
| 262 | DisplayPrint_ClearScreen:
|
|---|
| 263 | push di
|
|---|
| 264 | xor ax, ax
|
|---|
| 265 | call DisplayCursor_SetCoordinatesFromAX
|
|---|
| 266 | call DisplayPage_GetColumnsToALandRowsToAH
|
|---|
| 267 | call DisplayPrint_ClearAreaWithHeightInAHandWidthInAL
|
|---|
| 268 | pop di
|
|---|
| 269 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], di
|
|---|
| 270 | ret
|
|---|
| 271 |
|
|---|
| 272 |
|
|---|
| 273 | ;--------------------------------------------------------------------
|
|---|
| 274 | ; DisplayPrint_ClearAreaWithHeightInAHandWidthInAL
|
|---|
| 275 | ; Parameters:
|
|---|
| 276 | ; AH: Area height
|
|---|
| 277 | ; AL: Area width
|
|---|
| 278 | ; DS: BDA segment (zero)
|
|---|
| 279 | ; ES:DI: Ptr to cursor location in video RAM
|
|---|
| 280 | ; Returns:
|
|---|
| 281 | ; DI: Updated offset to video RAM
|
|---|
| 282 | ; Corrupts registers:
|
|---|
| 283 | ; AX, DX
|
|---|
| 284 | ;--------------------------------------------------------------------
|
|---|
| 285 | ALIGN JUMP_ALIGN
|
|---|
| 286 | DisplayPrint_ClearAreaWithHeightInAHandWidthInAL:
|
|---|
| 287 | push si
|
|---|
| 288 | push cx
|
|---|
| 289 | push bx
|
|---|
| 290 |
|
|---|
| 291 | xchg bx, ax ; Area size to BX
|
|---|
| 292 | call DisplayCursor_GetSoftwareCoordinatesToAX
|
|---|
| 293 | xchg si, ax ; Software (Y,X) coordinates now in SI
|
|---|
| 294 | xor cx, cx
|
|---|
| 295 |
|
|---|
| 296 | ALIGN JUMP_ALIGN
|
|---|
| 297 | .ClearRowLoop:
|
|---|
| 298 | mov cl, bl ; Area width now in CX
|
|---|
| 299 | mov al, ' ' ; Clear with space
|
|---|
| 300 | call DisplayPrint_RepeatCharacterFromALwithCountInCX
|
|---|
| 301 |
|
|---|
| 302 | xchg ax, si ; Coordinates to AX
|
|---|
| 303 | inc ah ; Increment row
|
|---|
| 304 | mov si, ax
|
|---|
| 305 | call DisplayCursor_SetCoordinatesFromAX
|
|---|
| 306 | dec bh ; Decrement rows left
|
|---|
| 307 | jnz SHORT .ClearRowLoop
|
|---|
| 308 |
|
|---|
| 309 | pop bx
|
|---|
| 310 | pop cx
|
|---|
| 311 | pop si
|
|---|
| 312 | ret
|
|---|
| 313 |
|
|---|
| 314 |
|
|---|
| 315 | ;--------------------------------------------------------------------
|
|---|
| 316 | ; DisplayPrint_RepeatCharacterFromALwithCountInCX
|
|---|
| 317 | ; Parameters:
|
|---|
| 318 | ; AL: Character to display
|
|---|
| 319 | ; CX: Repeat count
|
|---|
| 320 | ; DS: BDA segment (zero)
|
|---|
| 321 | ; ES:DI: Ptr to cursor location in video RAM
|
|---|
| 322 | ; Returns:
|
|---|
| 323 | ; DI: Updated offset to video RAM
|
|---|
| 324 | ; Corrupts registers:
|
|---|
| 325 | ; AX, DX
|
|---|
| 326 | ;--------------------------------------------------------------------
|
|---|
| 327 | ALIGN JUMP_ALIGN
|
|---|
| 328 | DisplayPrint_RepeatCharacterFromALwithCountInCX:
|
|---|
| 329 | push ax
|
|---|
| 330 | call DisplayPrint_CharacterFromAL
|
|---|
| 331 | pop ax
|
|---|
| 332 | loop DisplayPrint_RepeatCharacterFromALwithCountInCX
|
|---|
| 333 | ret
|
|---|
| 334 |
|
|---|
| 335 |
|
|---|
| 336 | ;--------------------------------------------------------------------
|
|---|
| 337 | ; DisplayPrint_CharacterFromAL
|
|---|
| 338 | ; Parameters:
|
|---|
| 339 | ; AL: Character to display
|
|---|
| 340 | ; DS: BDA segment (zero)
|
|---|
| 341 | ; ES:DI: Ptr to cursor location in video RAM
|
|---|
| 342 | ; Returns:
|
|---|
| 343 | ; DI: Updated offset to video RAM
|
|---|
| 344 | ; Corrupts registers:
|
|---|
| 345 | ; AX, DX
|
|---|
| 346 | ;--------------------------------------------------------------------
|
|---|
| 347 | ALIGN JUMP_ALIGN
|
|---|
| 348 | DisplayPrint_CharacterFromAL:
|
|---|
| 349 | mov ah, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute]
|
|---|
| 350 | jmp [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut]
|
|---|
