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source: xtideuniversalbios/trunk/Assembly_Library/Src/Display/DisplayContext.asm@ 199

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Last change on this file since 199 was 194, checked in by gregli@…, 13 years ago
ifdef'd out more unused code. Also added a tool for looking through the listing and the output of the precompiler to aid in finding dead code. Some changes in the files are to add annotations for the tool to avoid false positives.
File size: 9.7 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	;--------------------------------------------------------------------
	16	ALIGN JUMP_ALIGN
	17	DisplayContext_Initialize:
	18	mov WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut], DEFAULT_CHARACTER_OUTPUT
	19	mov WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCursorShape], CURSOR_NORMAL
[44]	20	mov BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], SCREEN_BACKGROUND_ATTRIBUTE
[101]	21	; Fall to .DetectAndSetDisplaySegment
[41]	22
	23	;--------------------------------------------------------------------
	24	; .DetectAndSetDisplaySegment
	25	; Parameters:
	26	; DS: BDA segment (zero)
	27	; Returns:
	28	; Nothing
	29	; Corrupts registers:
[50]	30	; AX, DX
[41]	31	;--------------------------------------------------------------------
	32	.DetectAndSetDisplaySegment:
[50]	33	mov ax, COLOR_TEXT_SEGMENT
[41]	34	cmp BYTE [VIDEO_BDA.bMode], MDA_TEXT_MODE
[101]	35	eCMOVE ah, MONO_TEXT_SEGMENT >> 8
[50]	36	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2], ax
[101]	37	; Fall to .InitializeFlags
[50]	38
	39	;--------------------------------------------------------------------
	40	; .InitializeFlags
	41	; Parameters:
	42	; DS: BDA segment (zero)
	43	; Returns:
	44	; Nothing
	45	; Corrupts registers:
	46	; AX, DX
	47	;--------------------------------------------------------------------
	48	.InitializeFlags:
	49	mov dl, FLG_CONTEXT_ATTRIBUTES
	50	call CgaSnow_IsCgaPresent
	51	jnc SHORT .DoNotSetCgaFlag
	52	or dl, FLG_CONTEXT_CGA
	53	.DoNotSetCgaFlag:
	54	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], dl
[101]	55	; Fall to .InitializeCursor
[41]	56
[101]	57	;--------------------------------------------------------------------
	58	; .InitializeCursor
	59	; Parameters:
	60	; DS: BDA segment (zero)
	61	; Returns:
	62	; Nothing
	63	; Corrupts registers:
	64	; AX, DX
	65	;--------------------------------------------------------------------
	66	.InitializeCursor:
[115]	67	call DisplayCursor_GetHardwareCoordinatesToAX ; Coordinates before init
	68	call DisplayCursor_SetCoordinatesFromAX ; Cursor to Display Context
[101]	69	; Fall to DisplayContext_SynchronizeToHardware
[41]	70
	71	;--------------------------------------------------------------------
[101]	72	; DisplayContext_SynchronizeToHardware
	73	; Parameters:
	74	; DS: BDA segment (zero)
	75	; Returns:
	76	; Nothing
	77	; Corrupts registers:
	78	; AX, DX
	79	;--------------------------------------------------------------------
	80	ALIGN JUMP_ALIGN
	81	DisplayContext_SynchronizeToHardware:
	82	call DisplayPage_SynchronizeToHardware
	83	call DisplayCursor_SynchronizeShapeToHardware
	84	jmp DisplayCursor_SynchronizeCoordinatesToHardware
	85
	86
	87	;--------------------------------------------------------------------
[41]	88	; DisplayContext_Push
	89	; Parameters:
	90	; Nothing
	91	; Returns:
	92	; Nothing
	93	; Corrupts registers:
	94	; AX, DI
	95	;--------------------------------------------------------------------
	96	ALIGN JUMP_ALIGN
	97	DisplayContext_Push:
	98	mov di, ds ; Backup DS
	99	LOAD_BDA_SEGMENT_TO ds, ax
	100	pop ax ; Pop return address
	101
[194]	102	%ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
[41]	103	%assign i 0
	104	%rep DISPLAY_CONTEXT_size / 2
	105	push WORD [VIDEO_BDA.displayContext + i]
	106	%assign i i+2
	107	%endrep
[194]	108	%endif
	109
[41]	110	mov ds, di ; Restore DS
	111	jmp ax
	112
	113	;--------------------------------------------------------------------
	114	; DisplayContext_Pop
	115	; Parameters:
	116	; Nothing
	117	; Returns:
	118	; Nothing
	119	; Corrupts registers:
	120	; AX, DI
	121	;--------------------------------------------------------------------
	122	ALIGN JUMP_ALIGN
	123	DisplayContext_Pop:
	124	mov di, ds ; Backup DS
	125	LOAD_BDA_SEGMENT_TO ds, ax
	126	pop ax ; Pop return address
	127
[194]	128	%ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
[41]	129	%assign i DISPLAY_CONTEXT_size-2
	130	%rep DISPLAY_CONTEXT_size / 2
	131	pop WORD [VIDEO_BDA.displayContext + i]
	132	%assign i i-2
	133	%endrep
[194]	134	%endif
	135
[41]	136	push ax ; Push return address
	137	push dx
	138	call DisplayContext_SynchronizeToHardware
	139	pop dx
	140	mov ds, di ; Restore DS
	141	ret
	142
	143
	144	;--------------------------------------------------------------------
[52]	145	; DisplayContext_PrepareOffScreenBufferInESBXwithLengthInCX
[48]	146	; Parameters:
[52]	147	; CX: Off screen buffer length in characters
	148	; ES:BX: Ptr to off screen buffer
[48]	149	; Returns:
	150	; Nothing
	151	; Corrupts registers:
[52]	152	; AX, DI
[48]	153	;--------------------------------------------------------------------
[133]	154	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[48]	155	ALIGN JUMP_ALIGN
[52]	156	DisplayContext_PrepareOffScreenBufferInESBXwithLengthInCX:
[48]	157	push ds
	158
	159	LOAD_BDA_SEGMENT_TO ds, di
	160	xchg ax, bx
	161	mov bx, es
	162	call DisplayContext_SetCharacterPointerFromBXAX ; ES:DI now has the pointer
	163
	164	mov bl, ATTRIBUTES_NOT_USED
	165	mov ax, BUFFER_OUTPUT_WITH_CHAR_ONLY
	166	call DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL
[52]	167	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam], cx
[48]	168
	169	mov bx, di
	170	pop ds
	171	ret
[133]	172	%endif
[48]	173
	174
	175	;--------------------------------------------------------------------
[41]	176	; DisplayContext_SetCharacterPointerFromBXAX
	177	; Parameters:
	178	; BX:AX: Ptr to destination for next character to output
	179	; DS: BDA segment (zero)
	180	; Returns:
[48]	181	; ES:DI: Pointer that was in BX:AX
[41]	182	; Corrupts registers:
	183	; AX
	184	;--------------------------------------------------------------------
[133]	185	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[41]	186	ALIGN JUMP_ALIGN
	187	DisplayContext_SetCharacterPointerFromBXAX:
	188	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], ax
	189	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2], bx
	190	xchg di, ax
	191	mov es, bx
	192	ret
[133]	193	%endif
[41]	194
	195
	196	;--------------------------------------------------------------------
	197	; DisplayContext_GetCharacterPointerToBXAX
	198	; Parameters:
	199	; DS: BDA segment (zero)
	200	; Returns:
	201	; BX:AX: Ptr to destination for next character to output
	202	; Corrupts registers:
	203	; Nothing
	204	;--------------------------------------------------------------------
[133]	205	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[41]	206	ALIGN JUMP_ALIGN
	207	DisplayContext_GetCharacterPointerToBXAX:
	208	mov ax, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition]
	209	mov bx, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2]
	210	ret
[133]	211	%endif
[41]	212
	213
	214	;--------------------------------------------------------------------
[45]	215	; DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL
[41]	216	; Parameters:
	217	; AX: Offset to character output function
[45]	218	; BL: Attribute Flag
[41]	219	; DS: BDA segment (zero)
	220	; Returns:
	221	; Nothing
	222	; Corrupts registers:
[50]	223	; BL
[41]	224	;--------------------------------------------------------------------
	225	ALIGN JUMP_ALIGN
[45]	226	DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL:
[50]	227	and bl, FLG_CONTEXT_ATTRIBUTES
	228	and BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], ~FLG_CONTEXT_ATTRIBUTES
	229	or [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], bl
[41]	230	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut], ax
	231	ret
[194]	232
[41]	233
	234	;--------------------------------------------------------------------
	235	; DisplayContext_SetCharacterAttributeFromAL
	236	; Parameters:
	237	; AL: Character attribute
	238	; DS: BDA segment (zero)
	239	; Returns:
	240	; Nothing
	241	; Corrupts registers:
	242	; Nothing
	243	;--------------------------------------------------------------------
	244	ALIGN JUMP_ALIGN
	245	DisplayContext_SetCharacterAttributeFromAL:
	246	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], al
	247	ret
	248
	249
	250	;--------------------------------------------------------------------
	251	; DisplayContext_SetCharacterOutputParameterFromAX
	252	; Parameters:
	253	; AX: Parameter for Character Output function
	254	; DS: BDA segment (zero)
	255	; Returns:
	256	; Nothing
	257	; Corrupts registers:
	258	; Nothing
	259	;--------------------------------------------------------------------
	260	ALIGN JUMP_ALIGN
	261	DisplayContext_SetCharacterOutputParameterFromAX:
	262	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam], ax
	263	ret
	264
[194]	265
[41]	266	;--------------------------------------------------------------------
	267	; DisplayContext_GetCharacterOutputParameterToDX
	268	; Parameters:
	269	; DS: BDA segment (zero)
	270	; Returns:
	271	; DX: User parameter for Character Output function
	272	; Corrupts registers:
	273	; Nothing
[133]	274	;--------------------------------------------------------------------
[181]	275	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS OR EXCLUDE_FROM_XTIDECFG ; This is currently unused (dead code)
	276	ALIGN JUMP_ALIGN
	277	DisplayContext_GetCharacterOutputParameterToDX:
	278	mov dx, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam]
	279	ret
	280	%endif
[44]	281
	282
	283	;--------------------------------------------------------------------
	284	; DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX
	285	; Parameters:
	286	; AX: Offset in bytes from some character to another
	287	; DS: BDA segment (zero)
	288	; Returns:
	289	; AX: Offset in characters from some character to another
	290	; Corrupts registers:
	291	; Nothing
[133]	292	;--------------------------------------------------------------------
[194]	293	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[44]	294	ALIGN JUMP_ALIGN
	295	DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX:
	296	test BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES
	297	jz SHORT ReturnOffsetInAX
	298	sar ax, 1 ; BYTE count to WORD count
	299	ret
[194]	300	%endif
[44]	301
[194]	302
[44]	303	;--------------------------------------------------------------------
	304	; DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX
	305	; Parameters:
	306	; AX: Offset in characters from some character to another
	307	; DS: BDA segment (zero)
	308	; Returns:
	309	; AX: Offset in bytes from some character to another
	310	; Corrupts registers:
	311	; Nothing
[133]	312	;--------------------------------------------------------------------
[194]	313	%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[44]	314	ALIGN JUMP_ALIGN
	315	DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX:
	316	test BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES
	317	jz SHORT ReturnOffsetInAX
	318	sal ax, 1 ; WORD count to BYTE count
	319	ALIGN JUMP_ALIGN, ret
	320	ReturnOffsetInAX:
	321	ret
[194]	322	%endif

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