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source: xtideuniversalbios/trunk/Assembly_Library/Src/Display/DisplayCursor.asm@ 537

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Last change on this file since 537 was 526, checked in by krille_n_@…, 12 years ago

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Update of the copyright notices to include the year 2013.

File size: 6.2 KB

Rev	Line
[41]	1	; Project name : Assembly Library
	2	; Description : Functions for managing display cursor.
	3
[376]	4	;
[445]	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.
[445]	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
[445]	16	; GNU General Public License for more details.
[376]	17	; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
[445]	18	;
[376]	19
[41]	20	; Section containing code
	21	SECTION .text
	22
	23	;--------------------------------------------------------------------
[407]	24	; DisplayCursor_GetDefaultCursorShapeToAX
	25	; Parameters:
	26	; DS: BDA segment (zero)
	27	; Returns:
	28	; AX: Default text mode cursor shape
	29	; Corrupts registers:
	30	; Nothing
	31	;--------------------------------------------------------------------
	32	ALIGN DISPLAY_JUMP_ALIGN
	33	DisplayCursor_GetDefaultCursorShapeToAX:
	34	mov ax, CURSOR_NORMAL_COLOR ; CGA, EGA, VGA cursor
	35	cmp BYTE [VIDEO_BDA.bMode], MDA_TEXT_MODE
	36	eCMOVE ax, CURSOR_NORMAL_MDA ; MDA cursor
	37	ret
	38
[491]	39
[407]	40	;--------------------------------------------------------------------
[41]	41	; DisplayCursor_SetShapeFromAX
	42	; Parameters:
	43	; AX: Cursor shape (AH=Start scan line, AL=End scan line)
	44	; DS: BDA segment (zero)
	45	; Returns:
	46	; Nothing
	47	; Corrupts registers:
	48	; Nothing
	49	;--------------------------------------------------------------------
[491]	50	%ifdef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
	51	%ifndef MODULE_BOOT_MENU
	52	%define EXCLUDE
	53	%endif
	54	%endif
	55
	56	%ifndef EXCLUDE
[369]	57	ALIGN DISPLAY_JUMP_ALIGN
[41]	58	DisplayCursor_SetShapeFromAX:
	59	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCursorShape], ax
	60	ret
[489]	61	%endif
[491]	62	%undef EXCLUDE
	63
	64
[41]	65	;--------------------------------------------------------------------
	66	; DisplayCursor_SetCoordinatesFromAX
	67	; Parameters:
	68	; AL: Cursor column (X-coordinate)
	69	; AH: Cursor row (Y-coordinate)
	70	; DS: BDA segment (zero)
	71	; Returns:
	72	; DI: Offset to cursor location in video RAM
	73	; Corrupts registers:
	74	; AX, DX
	75	;--------------------------------------------------------------------
[369]	76	ALIGN DISPLAY_JUMP_ALIGN
[41]	77	DisplayCursor_SetCoordinatesFromAX:
	78	xchg dx, ax
	79	mov ax, [VIDEO_BDA.wColumns] ; Column count, 40 or 80
	80	mul dh ; AX = Column count * row index
[101]	81	xor dh, dh
	82	add ax, dx ; Add column offset
[445]	83	eSHL_IM ax, 1 ; Convert to WORD offset
[101]	84	add ax, [VIDEO_BDA.wPageOffset] ; AX = Video RAM offset
	85	mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], ax
	86	xchg di, ax
[41]	87	ret
	88
	89
	90	;--------------------------------------------------------------------
	91	; DisplayCursor_GetSoftwareCoordinatesToAX
	92	; Parameters:
	93	; AX: Offset to cursor location in selected page
	94	; DS: BDA segment (zero)
	95	; Returns:
	96	; AL: Cursor column (X-coordinate)
	97	; AH: Cursor row (Y-coordinate)
	98	; Corrupts registers:
	99	; Nothing
	100	;--------------------------------------------------------------------
[369]	101	ALIGN DISPLAY_JUMP_ALIGN
[41]	102	DisplayCursor_GetSoftwareCoordinatesToAX:
	103	mov ax, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition]
	104	sub ax, [VIDEO_BDA.wPageOffset]
	105	shr ax, 1 ; WORD offset to character offset
	106	div BYTE [VIDEO_BDA.wColumns] ; AL = full rows, AH = column index for last row
	107	xchg al, ah
	108	ret
	109
	110
	111	;--------------------------------------------------------------------
	112	; DisplayCursor_GetHardwareCoordinatesToAX
	113	; Parameters:
	114	; DS: BDA segment (zero)
	115	; Returns:
	116	; AL: Hardware cursor column (X-coordinate)
	117	; AH: Hardware cursor row (Y-coordinate)
	118	; Corrupts registers:
	119	; DX
	120	;--------------------------------------------------------------------
[369]	121	ALIGN DISPLAY_JUMP_ALIGN
[41]	122	DisplayCursor_GetHardwareCoordinatesToAX:
	123	push cx
	124	push bx
	125
	126	mov ah, GET_CURSOR_POSITION_AND_SIZE
	127	mov bh, [VIDEO_BDA.bActivePage]
	128	int BIOS_VIDEO_INTERRUPT_10h
	129	xchg ax, dx
	130
	131	pop bx
	132	pop cx
	133	ret
	134
	135
	136	;--------------------------------------------------------------------
	137	; DisplayCursor_SynchronizeShapeToHardware
	138	; Parameters:
	139	; DS: BDA segment (zero)
	140	; Returns:
	141	; Nothing
	142	; Corrupts registers:
	143	; AX, DX
	144	;--------------------------------------------------------------------
[369]	145	ALIGN DISPLAY_JUMP_ALIGN
[41]	146	DisplayCursor_SynchronizeShapeToHardware:
	147	mov dx, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCursorShape]
	148	; Fall to .SetHardwareCursorShapeFromDX
	149
	150	;--------------------------------------------------------------------
	151	; .SetHardwareCursorShapeFromDX
	152	; Parameters:
	153	; DX: Cursor shape
	154	; DS: BDA segment (zero)
	155	; Returns:
	156	; Nothing
	157	; Corrupts registers:
	158	; AX
	159	;--------------------------------------------------------------------
	160	.SetHardwareCursorShapeFromDX:
	161	cmp dx, [VIDEO_BDA.wCursorShape]
	162	je SHORT .Return ; Return if no changes
	163	push cx
	164	mov cx, dx ; BIOS wants cursor shape in CX
	165	mov al, [VIDEO_BDA.bMode] ; Load video mode to prevent lock ups on some BIOSes
	166	mov ah, SET_TEXT_MODE_CURSOR_SHAPE
	167	int BIOS_VIDEO_INTERRUPT_10h
	168	pop cx
	169	.Return:
	170	ret
	171
	172
	173	;--------------------------------------------------------------------
	174	; DisplayCursor_SynchronizeCoordinatesToHardware
	175	; Parameters:
	176	; DS: BDA segment (zero)
	177	; Returns:
	178	; Nothing
	179	; Corrupts registers:
	180	; AX, DX
	181	;--------------------------------------------------------------------
[369]	182	ALIGN DISPLAY_JUMP_ALIGN
[41]	183	DisplayCursor_SynchronizeCoordinatesToHardware:
	184	call DisplayCursor_GetSoftwareCoordinatesToAX
	185	; Fall to .SetHardwareCursorCoordinatesFromAX
	186
	187	;--------------------------------------------------------------------
	188	; .SetHardwareCursorCoordinatesFromAX
	189	; Parameters:
	190	; AL: Cursor column (X-coordinate)
	191	; AH: Cursor row (Y-coordinate)
	192	; DS: BDA segment (zero)
	193	; Returns:
	194	; Nothing
	195	; Corrupts registers:
	196	; AX, DX
	197	;--------------------------------------------------------------------
	198	.SetHardwareCursorCoordinatesFromAX:
	199	push bx
	200	xchg dx, ax ; BIOS wants coordinates in DX
	201	mov ah, SET_CURSOR_POSITION
	202	mov bh, [VIDEO_BDA.bActivePage]
	203	int BIOS_VIDEO_INTERRUPT_10h
	204	pop bx
	205	ret

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