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DisplayContext.asm@ 372

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Last change on this file since 372 was 369, checked in by gregli@…, 13 years ago

Removed align directives for initalization code and added define for align in boot-time calls to the assembly library (defaulting to 1), resulting in a significant savings for the AT and 386 builds. Fixed a bug with switch command line handling in the serial server. Put in CR characters in licesnse.txt, so that it properly displays on Windows. In the configurator, added default values for user supplied CHS and LBA values, defaulting to values within range when those features are enabled. Updated the copyright message in the configurator as the literal word Copyright is important.

File size: 9.8 KB

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

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source: xtideuniversalbios/trunk/Assembly_Library/Src/Display/DisplayContext.asm@ 372

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