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source: xtideuniversalbios/trunk/Assembly_Library/Src/Display/DisplayContext.asm@ 576

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Last change on this file since 576 was 531, checked in by krille_n_@…, 12 years ago

Changes:

A few minor optimizations.

File size: 11.0 KB

Rev	Line
[41]	1	; Project name : Assembly Library
	2	; Description : Functions for managing display context.
	3
[376]	4	;
[491]	5	; XTIDE Universal BIOS and Associated Tools
[526]	6	; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
[376]	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.
[491]	12	;
[376]	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
[491]	16	; GNU General Public License for more details.
[376]	17	; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
[491]	18	;
[376]	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
[407]	36	call DisplayCursor_GetDefaultCursorShapeToAX
[287]	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
[491]	106	; DisplayContext_Pop
[41]	107	; Parameters:
	108	; Nothing
	109	; Returns:
	110	; Nothing
	111	; Corrupts registers:
	112	; AX, DI
	113	;--------------------------------------------------------------------
[491]	114	%ifdef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
	115	%ifndef MODULE_BOOT_MENU
	116	%define EXCLUDE
	117	%endif
	118	%endif
	119
	120	%ifndef EXCLUDE
[369]	121	ALIGN DISPLAY_JUMP_ALIGN
[41]	122	DisplayContext_Push:
	123	mov di, ds ; Backup DS
	124	LOAD_BDA_SEGMENT_TO ds, ax
	125	pop ax ; Pop return address
	126
[194]	127	%ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
[41]	128	%assign i 0
[531]	129	%ifdef USE_386
	130	%rep DISPLAY_CONTEXT_size / 4
	131	push DWORD [VIDEO_BDA.displayContext + i]
	132	%assign i i+4
	133	%endrep
	134	%else
	135	%rep DISPLAY_CONTEXT_size / 2
	136	push WORD [VIDEO_BDA.displayContext + i]
	137	%assign i i+2
	138	%endrep
	139	%endif
[194]	140	%endif
[491]	141
[41]	142	mov ds, di ; Restore DS
	143	jmp ax
	144
[491]	145
[369]	146	ALIGN DISPLAY_JUMP_ALIGN
[41]	147	DisplayContext_Pop:
	148	mov di, ds ; Backup DS
	149	LOAD_BDA_SEGMENT_TO ds, ax
	150	pop ax ; Pop return address
	151
[491]	152	%ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
[531]	153	%ifdef USE_386
	154	%assign i DISPLAY_CONTEXT_size-4
	155	%rep DISPLAY_CONTEXT_size / 4
	156	pop DWORD [VIDEO_BDA.displayContext + i]
	157	%assign i i-4
	158	%endrep
	159	%else
	160	%assign i DISPLAY_CONTEXT_size-2
	161	%rep DISPLAY_CONTEXT_size / 2
	162	pop WORD [VIDEO_BDA.displayContext + i]
	163	%assign i i-2
	164	%endrep
	165	%endif
[194]	166	%endif
[491]	167
[41]	168	push ax ; Push return address
	169	push dx
	170	call DisplayContext_SynchronizeToHardware
	171	pop dx
	172	mov ds, di ; Restore DS
	173	ret
[491]	174	%endif ; EXCLUDE
	175	%undef EXCLUDE
[41]	176
[491]	177
[41]	178	;--------------------------------------------------------------------
[52]	179	; DisplayContext_PrepareOffScreenBufferInESBXwithLengthInCX
[48]	180	; Parameters:
[52]	181	; CX: Off screen buffer length in characters
	182	; ES:BX: Ptr to off screen buffer
[48]	183	; Returns:
	184	; Nothing
	185	; Corrupts registers:
[52]	186	; AX, DI
[48]	187	;--------------------------------------------------------------------
[133]	188	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[369]	189	ALIGN DISPLAY_JUMP_ALIGN
[52]	190	DisplayContext_PrepareOffScreenBufferInESBXwithLengthInCX:
[48]	191	push ds
	192
	193	LOAD_BDA_SEGMENT_TO ds, di
	194	xchg ax, bx
	195	mov bx, es
	196	call DisplayContext_SetCharacterPointerFromBXAX ; ES:DI now has the pointer
	197
	198	mov bl, ATTRIBUTES_NOT_USED
	199	mov ax, BUFFER_OUTPUT_WITH_CHAR_ONLY
	200	call DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL
[52]	201	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam], cx
[48]	202
	203	mov bx, di
	204	pop ds
	205	ret
[491]	206	%endif ; EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[48]	207
	208
	209	;--------------------------------------------------------------------
[41]	210	; DisplayContext_SetCharacterPointerFromBXAX
	211	; Parameters:
	212	; BX:AX: Ptr to destination for next character to output
	213	; DS: BDA segment (zero)
	214	; Returns:
[48]	215	; ES:DI: Pointer that was in BX:AX
[41]	216	; Corrupts registers:
	217	; AX
	218	;--------------------------------------------------------------------
[133]	219	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[369]	220	ALIGN DISPLAY_JUMP_ALIGN
[41]	221	DisplayContext_SetCharacterPointerFromBXAX:
	222	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], ax
	223	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2], bx
	224	xchg di, ax
	225	mov es, bx
	226	ret
[133]	227	%endif
[41]	228
	229
	230	;--------------------------------------------------------------------
	231	; DisplayContext_GetCharacterPointerToBXAX
	232	; Parameters:
	233	; DS: BDA segment (zero)
	234	; Returns:
	235	; BX:AX: Ptr to destination for next character to output
	236	; Corrupts registers:
	237	; Nothing
	238	;--------------------------------------------------------------------
[133]	239	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[369]	240	ALIGN DISPLAY_JUMP_ALIGN
[41]	241	DisplayContext_GetCharacterPointerToBXAX:
	242	mov ax, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition]
	243	mov bx, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2]
	244	ret
[133]	245	%endif
[41]	246
	247
[491]	248	%ifdef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
	249	%ifndef MODULE_BOOT_MENU
	250	%define EXCLUDE
	251	%endif
	252	%endif
[41]	253	;--------------------------------------------------------------------
[45]	254	; DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL
[41]	255	; Parameters:
	256	; AX: Offset to character output function
[45]	257	; BL: Attribute Flag
[41]	258	; DS: BDA segment (zero)
	259	; Returns:
	260	; Nothing
	261	; Corrupts registers:
[50]	262	; BL
[41]	263	;--------------------------------------------------------------------
[491]	264	%ifndef EXCLUDE ; 1 of 3
[369]	265	ALIGN DISPLAY_JUMP_ALIGN
[45]	266	DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL:
[50]	267	and bl, FLG_CONTEXT_ATTRIBUTES
	268	and BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], ~FLG_CONTEXT_ATTRIBUTES
	269	or [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], bl
[41]	270	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut], ax
	271	ret
[491]	272	%endif
[41]	273
[489]	274
[41]	275	;--------------------------------------------------------------------
	276	; DisplayContext_SetCharacterAttributeFromAL
	277	; Parameters:
	278	; AL: Character attribute
	279	; DS: BDA segment (zero)
	280	; Returns:
	281	; Nothing
	282	; Corrupts registers:
	283	; Nothing
	284	;--------------------------------------------------------------------
[491]	285	%ifndef EXCLUDE ; 2 of 3
[369]	286	ALIGN DISPLAY_JUMP_ALIGN
[41]	287	DisplayContext_SetCharacterAttributeFromAL:
	288	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], al
	289	ret
[491]	290	%endif
[41]	291
	292
	293	;--------------------------------------------------------------------
	294	; DisplayContext_SetCharacterOutputParameterFromAX
	295	; Parameters:
	296	; AX: Parameter for Character Output function
	297	; DS: BDA segment (zero)
	298	; Returns:
	299	; Nothing
	300	; Corrupts registers:
	301	; Nothing
	302	;--------------------------------------------------------------------
[491]	303	%ifndef EXCLUDE ; 3 of 3
[369]	304	ALIGN DISPLAY_JUMP_ALIGN
[41]	305	DisplayContext_SetCharacterOutputParameterFromAX:
	306	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam], ax
	307	ret
[491]	308	%endif
	309
	310	%undef EXCLUDE
	311
	312
[41]	313	;--------------------------------------------------------------------
	314	; DisplayContext_GetCharacterOutputParameterToDX
	315	; Parameters:
	316	; DS: BDA segment (zero)
	317	; Returns:
	318	; DX: User parameter for Character Output function
	319	; Corrupts registers:
	320	; Nothing
[133]	321	;--------------------------------------------------------------------
[491]	322	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS OR EXCLUDE_FROM_XTIDECFG
[369]	323	ALIGN DISPLAY_JUMP_ALIGN
[181]	324	DisplayContext_GetCharacterOutputParameterToDX:
	325	mov dx, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam]
	326	ret
	327	%endif
[44]	328
	329
	330	;--------------------------------------------------------------------
	331	; DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX
	332	; Parameters:
	333	; AX: Offset in bytes from some character to another
	334	; DS: BDA segment (zero)
	335	; Returns:
	336	; AX: Offset in characters from some character to another
	337	; Corrupts registers:
	338	; Nothing
[133]	339	;--------------------------------------------------------------------
[201]	340	%ifndef MODULE_STRINGS_COMPRESSED
[369]	341	ALIGN DISPLAY_JUMP_ALIGN
[44]	342	DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX:
	343	test BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES
	344	jz SHORT ReturnOffsetInAX
	345	sar ax, 1 ; BYTE count to WORD count
	346	ret
[194]	347	%endif
[44]	348
[491]	349
[44]	350	;--------------------------------------------------------------------
	351	; DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX
	352	; Parameters:
	353	; AX: Offset in characters from some character to another
	354	; DS: BDA segment (zero)
	355	; Returns:
	356	; AX: Offset in bytes from some character to another
	357	; Corrupts registers:
	358	; Nothing
[133]	359	;--------------------------------------------------------------------
[201]	360	%ifndef MODULE_STRINGS_COMPRESSED
[369]	361	ALIGN DISPLAY_JUMP_ALIGN
[44]	362	DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX:
	363	test BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES
	364	jz SHORT ReturnOffsetInAX
	365	sal ax, 1 ; WORD count to BYTE count
[369]	366	ALIGN DISPLAY_JUMP_ALIGN, ret
[44]	367	ReturnOffsetInAX:
	368	ret
[194]	369	%endif

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