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source: xtideuniversalbios/trunk/Assembly_Library/Src/Display/DisplayPrint.asm@ 124

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Last change on this file since 124 was 101, checked in by Tomi Tilli, 14 years ago

Changes to Assembly Library:

Some minor size optimizations to Display Library.

File size: 9.5 KB

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

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