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source: xtideuniversalbios/trunk/Assembly_Library/Src/Display/DisplayContext.asm@ 396

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Last change on this file since 396 was 376, checked in by gregli@…, 13 years ago
WIDE checkin... Added copyright and license information to sorce files, as per the GPL instructions for usage.
File size: 10.5 KB

Rev	Line
[41]	1	; Project name : Assembly Library
	2	; Description : Functions for managing display context.
	3
[376]	4	;
	5	; XTIDE Universal BIOS and Associated Tools
	6	; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team.
	7	;
	8	; This program is free software; you can redistribute it and/or modify
	9	; it under the terms of the GNU General Public License as published by
	10	; the Free Software Foundation; either version 2 of the License, or
	11	; (at your option) any later version.
	12	;
	13	; This program is distributed in the hope that it will be useful,
	14	; but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	; GNU General Public License for more details.
	17	; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
	18	;
	19
[41]	20	; Section containing code
	21	SECTION .text
	22
	23	;--------------------------------------------------------------------
	24	; DisplayContext_Initialize
	25	; Parameters:
	26	; DS: BDA segment (zero)
	27	; Returns:
	28	; Nothing
	29	; Corrupts registers:
	30	; AX, DX, DI
	31	;--------------------------------------------------------------------
[369]	32	ALIGN DISPLAY_JUMP_ALIGN
[41]	33	DisplayContext_Initialize:
	34	mov WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut], DEFAULT_CHARACTER_OUTPUT
[44]	35	mov BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], SCREEN_BACKGROUND_ATTRIBUTE
[287]	36	mov ax, [VIDEO_BDA.wCursorShape]
	37	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCursorShape], ax
[101]	38	; Fall to .DetectAndSetDisplaySegment
[41]	39
	40	;--------------------------------------------------------------------
	41	; .DetectAndSetDisplaySegment
	42	; Parameters:
	43	; DS: BDA segment (zero)
	44	; Returns:
	45	; Nothing
	46	; Corrupts registers:
[50]	47	; AX, DX
[41]	48	;--------------------------------------------------------------------
	49	.DetectAndSetDisplaySegment:
[50]	50	mov ax, COLOR_TEXT_SEGMENT
[41]	51	cmp BYTE [VIDEO_BDA.bMode], MDA_TEXT_MODE
[101]	52	eCMOVE ah, MONO_TEXT_SEGMENT >> 8
[50]	53	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2], ax
[101]	54	; Fall to .InitializeFlags
[50]	55
	56	;--------------------------------------------------------------------
	57	; .InitializeFlags
	58	; Parameters:
	59	; DS: BDA segment (zero)
	60	; Returns:
	61	; Nothing
	62	; Corrupts registers:
	63	; AX, DX
	64	;--------------------------------------------------------------------
	65	.InitializeFlags:
	66	mov dl, FLG_CONTEXT_ATTRIBUTES
	67	call CgaSnow_IsCgaPresent
	68	jnc SHORT .DoNotSetCgaFlag
	69	or dl, FLG_CONTEXT_CGA
	70	.DoNotSetCgaFlag:
	71	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], dl
[101]	72	; Fall to .InitializeCursor
[41]	73
[101]	74	;--------------------------------------------------------------------
	75	; .InitializeCursor
	76	; Parameters:
	77	; DS: BDA segment (zero)
	78	; Returns:
	79	; Nothing
	80	; Corrupts registers:
	81	; AX, DX
	82	;--------------------------------------------------------------------
	83	.InitializeCursor:
[115]	84	call DisplayCursor_GetHardwareCoordinatesToAX ; Coordinates before init
	85	call DisplayCursor_SetCoordinatesFromAX ; Cursor to Display Context
[101]	86	; Fall to DisplayContext_SynchronizeToHardware
[41]	87
	88	;--------------------------------------------------------------------
[101]	89	; DisplayContext_SynchronizeToHardware
	90	; Parameters:
	91	; DS: BDA segment (zero)
	92	; Returns:
	93	; Nothing
	94	; Corrupts registers:
	95	; AX, DX
	96	;--------------------------------------------------------------------
[369]	97	ALIGN DISPLAY_JUMP_ALIGN
[101]	98	DisplayContext_SynchronizeToHardware:
	99	call DisplayPage_SynchronizeToHardware
	100	call DisplayCursor_SynchronizeShapeToHardware
	101	jmp DisplayCursor_SynchronizeCoordinatesToHardware
	102
	103
	104	;--------------------------------------------------------------------
[41]	105	; DisplayContext_Push
	106	; Parameters:
	107	; Nothing
	108	; Returns:
	109	; Nothing
	110	; Corrupts registers:
	111	; AX, DI
	112	;--------------------------------------------------------------------
[369]	113	ALIGN DISPLAY_JUMP_ALIGN
[41]	114	DisplayContext_Push:
	115	mov di, ds ; Backup DS
	116	LOAD_BDA_SEGMENT_TO ds, ax
	117	pop ax ; Pop return address
	118
[194]	119	%ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
[41]	120	%assign i 0
	121	%rep DISPLAY_CONTEXT_size / 2
	122	push WORD [VIDEO_BDA.displayContext + i]
	123	%assign i i+2
	124	%endrep
[194]	125	%endif
	126
[41]	127	mov ds, di ; Restore DS
	128	jmp ax
	129
	130	;--------------------------------------------------------------------
	131	; DisplayContext_Pop
	132	; Parameters:
	133	; Nothing
	134	; Returns:
	135	; Nothing
	136	; Corrupts registers:
	137	; AX, DI
	138	;--------------------------------------------------------------------
[369]	139	ALIGN DISPLAY_JUMP_ALIGN
[41]	140	DisplayContext_Pop:
	141	mov di, ds ; Backup DS
	142	LOAD_BDA_SEGMENT_TO ds, ax
	143	pop ax ; Pop return address
	144
[194]	145	%ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
[41]	146	%assign i DISPLAY_CONTEXT_size-2
	147	%rep DISPLAY_CONTEXT_size / 2
	148	pop WORD [VIDEO_BDA.displayContext + i]
	149	%assign i i-2
	150	%endrep
[194]	151	%endif
	152
[41]	153	push ax ; Push return address
	154	push dx
	155	call DisplayContext_SynchronizeToHardware
	156	pop dx
	157	mov ds, di ; Restore DS
	158	ret
	159
	160
	161	;--------------------------------------------------------------------
[52]	162	; DisplayContext_PrepareOffScreenBufferInESBXwithLengthInCX
[48]	163	; Parameters:
[52]	164	; CX: Off screen buffer length in characters
	165	; ES:BX: Ptr to off screen buffer
[48]	166	; Returns:
	167	; Nothing
	168	; Corrupts registers:
[52]	169	; AX, DI
[48]	170	;--------------------------------------------------------------------
[133]	171	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[369]	172	ALIGN DISPLAY_JUMP_ALIGN
[52]	173	DisplayContext_PrepareOffScreenBufferInESBXwithLengthInCX:
[48]	174	push ds
	175
	176	LOAD_BDA_SEGMENT_TO ds, di
	177	xchg ax, bx
	178	mov bx, es
	179	call DisplayContext_SetCharacterPointerFromBXAX ; ES:DI now has the pointer
	180
	181	mov bl, ATTRIBUTES_NOT_USED
	182	mov ax, BUFFER_OUTPUT_WITH_CHAR_ONLY
	183	call DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL
[52]	184	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam], cx
[48]	185
	186	mov bx, di
	187	pop ds
	188	ret
[133]	189	%endif
[48]	190
	191
	192	;--------------------------------------------------------------------
[41]	193	; DisplayContext_SetCharacterPointerFromBXAX
	194	; Parameters:
	195	; BX:AX: Ptr to destination for next character to output
	196	; DS: BDA segment (zero)
	197	; Returns:
[48]	198	; ES:DI: Pointer that was in BX:AX
[41]	199	; Corrupts registers:
	200	; AX
	201	;--------------------------------------------------------------------
[133]	202	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[369]	203	ALIGN DISPLAY_JUMP_ALIGN
[41]	204	DisplayContext_SetCharacterPointerFromBXAX:
	205	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], ax
	206	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2], bx
	207	xchg di, ax
	208	mov es, bx
	209	ret
[133]	210	%endif
[41]	211
	212
	213	;--------------------------------------------------------------------
	214	; DisplayContext_GetCharacterPointerToBXAX
	215	; Parameters:
	216	; DS: BDA segment (zero)
	217	; Returns:
	218	; BX:AX: Ptr to destination for next character to output
	219	; Corrupts registers:
	220	; Nothing
	221	;--------------------------------------------------------------------
[133]	222	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[369]	223	ALIGN DISPLAY_JUMP_ALIGN
[41]	224	DisplayContext_GetCharacterPointerToBXAX:
	225	mov ax, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition]
	226	mov bx, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2]
	227	ret
[133]	228	%endif
[41]	229
	230
	231	;--------------------------------------------------------------------
[45]	232	; DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL
[41]	233	; Parameters:
	234	; AX: Offset to character output function
[45]	235	; BL: Attribute Flag
[41]	236	; DS: BDA segment (zero)
	237	; Returns:
	238	; Nothing
	239	; Corrupts registers:
[50]	240	; BL
[41]	241	;--------------------------------------------------------------------
[369]	242	ALIGN DISPLAY_JUMP_ALIGN
[45]	243	DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL:
[50]	244	and bl, FLG_CONTEXT_ATTRIBUTES
	245	and BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], ~FLG_CONTEXT_ATTRIBUTES
	246	or [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], bl
[41]	247	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut], ax
	248	ret
[194]	249
[41]	250
	251	;--------------------------------------------------------------------
	252	; DisplayContext_SetCharacterAttributeFromAL
	253	; Parameters:
	254	; AL: Character attribute
	255	; DS: BDA segment (zero)
	256	; Returns:
	257	; Nothing
	258	; Corrupts registers:
	259	; Nothing
	260	;--------------------------------------------------------------------
[369]	261	ALIGN DISPLAY_JUMP_ALIGN
[41]	262	DisplayContext_SetCharacterAttributeFromAL:
	263	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], al
	264	ret
	265
	266
	267	;--------------------------------------------------------------------
	268	; DisplayContext_SetCharacterOutputParameterFromAX
	269	; Parameters:
	270	; AX: Parameter for Character Output function
	271	; DS: BDA segment (zero)
	272	; Returns:
	273	; Nothing
	274	; Corrupts registers:
	275	; Nothing
	276	;--------------------------------------------------------------------
[369]	277	ALIGN DISPLAY_JUMP_ALIGN
[41]	278	DisplayContext_SetCharacterOutputParameterFromAX:
	279	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam], ax
	280	ret
	281
[194]	282
[41]	283	;--------------------------------------------------------------------
	284	; DisplayContext_GetCharacterOutputParameterToDX
	285	; Parameters:
	286	; DS: BDA segment (zero)
	287	; Returns:
	288	; DX: User parameter for Character Output function
	289	; Corrupts registers:
	290	; Nothing
[133]	291	;--------------------------------------------------------------------
[181]	292	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS OR EXCLUDE_FROM_XTIDECFG ; This is currently unused (dead code)
[369]	293	ALIGN DISPLAY_JUMP_ALIGN
[181]	294	DisplayContext_GetCharacterOutputParameterToDX:
	295	mov dx, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam]
	296	ret
	297	%endif
[44]	298
	299
	300	;--------------------------------------------------------------------
	301	; DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX
	302	; Parameters:
	303	; AX: Offset in bytes from some character to another
	304	; DS: BDA segment (zero)
	305	; Returns:
	306	; AX: Offset in characters from some character to another
	307	; Corrupts registers:
	308	; Nothing
[133]	309	;--------------------------------------------------------------------
[201]	310	%ifndef MODULE_STRINGS_COMPRESSED
[369]	311	ALIGN DISPLAY_JUMP_ALIGN
[44]	312	DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX:
	313	test BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES
	314	jz SHORT ReturnOffsetInAX
	315	sar ax, 1 ; BYTE count to WORD count
	316	ret
[194]	317	%endif
[44]	318
[194]	319
[44]	320	;--------------------------------------------------------------------
	321	; DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX
	322	; Parameters:
	323	; AX: Offset in characters from some character to another
	324	; DS: BDA segment (zero)
	325	; Returns:
	326	; AX: Offset in bytes from some character to another
	327	; Corrupts registers:
	328	; Nothing
[133]	329	;--------------------------------------------------------------------
[201]	330	%ifndef MODULE_STRINGS_COMPRESSED
[369]	331	ALIGN DISPLAY_JUMP_ALIGN
[44]	332	DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX:
	333	test BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES
	334	jz SHORT ReturnOffsetInAX
	335	sal ax, 1 ; WORD count to BYTE count
[369]	336	ALIGN DISPLAY_JUMP_ALIGN, ret
[44]	337	ReturnOffsetInAX:
	338	ret
[194]	339	%endif

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