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DisplayContext.asm@ 498

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Last change on this file since 498 was 491, checked in by krille_n_@…, 12 years ago

Changes:

Added a new define (USE_UNDOC_INTEL) that enables optimizations possible by using undocumented instructions available on all Intel processors and truly compatible clones. AFAIK the only exceptions are the NEC V-series and the Sony CXQ70108 processors so this option should be safe for use on the AT builds.
Building BIOSDRVS or the BIOS without MODULE_STRINGS_COMPRESSED would fail due to the recent code exclusions so I changed them a bit. Also fixed the mistaken change to Main.asm
Changed the Tandy specific info in Configuration_FullMode.txt so it matches the info in the Wiki.
Optimizations and fixes in general.

File size: 10.6 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
[376]	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.
[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
	129	%rep DISPLAY_CONTEXT_size / 2
	130	push WORD [VIDEO_BDA.displayContext + i]
	131	%assign i i+2
	132	%endrep
[194]	133	%endif
[491]	134
[41]	135	mov ds, di ; Restore DS
	136	jmp ax
	137
[491]	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
[491]	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
[491]	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
[491]	159	%endif ; EXCLUDE
	160	%undef EXCLUDE
[41]	161
[491]	162
[41]	163	;--------------------------------------------------------------------
[52]	164	; DisplayContext_PrepareOffScreenBufferInESBXwithLengthInCX
[48]	165	; Parameters:
[52]	166	; CX: Off screen buffer length in characters
	167	; ES:BX: Ptr to off screen buffer
[48]	168	; Returns:
	169	; Nothing
	170	; Corrupts registers:
[52]	171	; AX, DI
[48]	172	;--------------------------------------------------------------------
[133]	173	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[369]	174	ALIGN DISPLAY_JUMP_ALIGN
[52]	175	DisplayContext_PrepareOffScreenBufferInESBXwithLengthInCX:
[48]	176	push ds
	177
	178	LOAD_BDA_SEGMENT_TO ds, di
	179	xchg ax, bx
	180	mov bx, es
	181	call DisplayContext_SetCharacterPointerFromBXAX ; ES:DI now has the pointer
	182
	183	mov bl, ATTRIBUTES_NOT_USED
	184	mov ax, BUFFER_OUTPUT_WITH_CHAR_ONLY
	185	call DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL
[52]	186	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam], cx
[48]	187
	188	mov bx, di
	189	pop ds
	190	ret
[491]	191	%endif ; EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[48]	192
	193
	194	;--------------------------------------------------------------------
[41]	195	; DisplayContext_SetCharacterPointerFromBXAX
	196	; Parameters:
	197	; BX:AX: Ptr to destination for next character to output
	198	; DS: BDA segment (zero)
	199	; Returns:
[48]	200	; ES:DI: Pointer that was in BX:AX
[41]	201	; Corrupts registers:
	202	; AX
	203	;--------------------------------------------------------------------
[133]	204	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[369]	205	ALIGN DISPLAY_JUMP_ALIGN
[41]	206	DisplayContext_SetCharacterPointerFromBXAX:
	207	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], ax
	208	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2], bx
	209	xchg di, ax
	210	mov es, bx
	211	ret
[133]	212	%endif
[41]	213
	214
	215	;--------------------------------------------------------------------
	216	; DisplayContext_GetCharacterPointerToBXAX
	217	; Parameters:
	218	; DS: BDA segment (zero)
	219	; Returns:
	220	; BX:AX: Ptr to destination for next character to output
	221	; Corrupts registers:
	222	; Nothing
	223	;--------------------------------------------------------------------
[133]	224	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[369]	225	ALIGN DISPLAY_JUMP_ALIGN
[41]	226	DisplayContext_GetCharacterPointerToBXAX:
	227	mov ax, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition]
	228	mov bx, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2]
	229	ret
[133]	230	%endif
[41]	231
	232
[491]	233	%ifdef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
	234	%ifndef MODULE_BOOT_MENU
	235	%define EXCLUDE
	236	%endif
	237	%endif
[41]	238	;--------------------------------------------------------------------
[45]	239	; DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL
[41]	240	; Parameters:
	241	; AX: Offset to character output function
[45]	242	; BL: Attribute Flag
[41]	243	; DS: BDA segment (zero)
	244	; Returns:
	245	; Nothing
	246	; Corrupts registers:
[50]	247	; BL
[41]	248	;--------------------------------------------------------------------
[491]	249	%ifndef EXCLUDE ; 1 of 3
[369]	250	ALIGN DISPLAY_JUMP_ALIGN
[45]	251	DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL:
[50]	252	and bl, FLG_CONTEXT_ATTRIBUTES
	253	and BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], ~FLG_CONTEXT_ATTRIBUTES
	254	or [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], bl
[41]	255	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut], ax
	256	ret
[491]	257	%endif
[41]	258
[489]	259
[41]	260	;--------------------------------------------------------------------
	261	; DisplayContext_SetCharacterAttributeFromAL
	262	; Parameters:
	263	; AL: Character attribute
	264	; DS: BDA segment (zero)
	265	; Returns:
	266	; Nothing
	267	; Corrupts registers:
	268	; Nothing
	269	;--------------------------------------------------------------------
[491]	270	%ifndef EXCLUDE ; 2 of 3
[369]	271	ALIGN DISPLAY_JUMP_ALIGN
[41]	272	DisplayContext_SetCharacterAttributeFromAL:
	273	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], al
	274	ret
[491]	275	%endif
[41]	276
	277
	278	;--------------------------------------------------------------------
	279	; DisplayContext_SetCharacterOutputParameterFromAX
	280	; Parameters:
	281	; AX: Parameter for Character Output function
	282	; DS: BDA segment (zero)
	283	; Returns:
	284	; Nothing
	285	; Corrupts registers:
	286	; Nothing
	287	;--------------------------------------------------------------------
[491]	288	%ifndef EXCLUDE ; 3 of 3
[369]	289	ALIGN DISPLAY_JUMP_ALIGN
[41]	290	DisplayContext_SetCharacterOutputParameterFromAX:
	291	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam], ax
	292	ret
[491]	293	%endif
	294
	295	%undef EXCLUDE
	296
	297
[41]	298	;--------------------------------------------------------------------
	299	; DisplayContext_GetCharacterOutputParameterToDX
	300	; Parameters:
	301	; DS: BDA segment (zero)
	302	; Returns:
	303	; DX: User parameter for Character Output function
	304	; Corrupts registers:
	305	; Nothing
[133]	306	;--------------------------------------------------------------------
[491]	307	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS OR EXCLUDE_FROM_XTIDECFG
[369]	308	ALIGN DISPLAY_JUMP_ALIGN
[181]	309	DisplayContext_GetCharacterOutputParameterToDX:
	310	mov dx, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam]
	311	ret
	312	%endif
[44]	313
	314
	315	;--------------------------------------------------------------------
	316	; DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX
	317	; Parameters:
	318	; AX: Offset in bytes from some character to another
	319	; DS: BDA segment (zero)
	320	; Returns:
	321	; AX: Offset in characters from some character to another
	322	; Corrupts registers:
	323	; Nothing
[133]	324	;--------------------------------------------------------------------
[201]	325	%ifndef MODULE_STRINGS_COMPRESSED
[369]	326	ALIGN DISPLAY_JUMP_ALIGN
[44]	327	DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX:
	328	test BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES
	329	jz SHORT ReturnOffsetInAX
	330	sar ax, 1 ; BYTE count to WORD count
	331	ret
[194]	332	%endif
[44]	333
[491]	334
[44]	335	;--------------------------------------------------------------------
	336	; DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX
	337	; Parameters:
	338	; AX: Offset in characters from some character to another
	339	; DS: BDA segment (zero)
	340	; Returns:
	341	; AX: Offset in bytes from some character to another
	342	; Corrupts registers:
	343	; Nothing
[133]	344	;--------------------------------------------------------------------
[201]	345	%ifndef MODULE_STRINGS_COMPRESSED
[369]	346	ALIGN DISPLAY_JUMP_ALIGN
[44]	347	DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX:
	348	test BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES
	349	jz SHORT ReturnOffsetInAX
	350	sal ax, 1 ; WORD count to BYTE count
[369]	351	ALIGN DISPLAY_JUMP_ALIGN, ret
[44]	352	ReturnOffsetInAX:
	353	ret
[194]	354	%endif

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source: xtideuniversalbios/trunk/Assembly_Library/Src/Display/DisplayContext.asm@ 498

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