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HotkeyBar.asm@ 602

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Last change on this file since 602 was 601, checked in by Krister Nordvall, 6 years ago

Changes:

Building the BIOS now works again.
Added a new IDE device type/transfer mode for use only with XT-IDE rev 2+ (or Chuck(G)-modded rev 1) cards installed in any of the following machines: Olivetti M24, AT&T PC6300, Xerox 6060 and Logabax Persona 1600. This new transfer mode is slightly faster than the regular XT-IDE rev 1 device type and requires that the card is configured for High Speed mode (or, in case of the card being a rev 1 card, has the Chuck(G) mod done). The new device type is called "XTIDE rev 2 (Olivetti M24)" in XTIDECFG.
Made some minor improvements to the library code that handles 'Drive Not Ready' errors in XTIDECFG.
Optimizations.

File size: 17.9 KB

Rev	Line
[392]	1	; Project name : XTIDE Universal BIOS
	2	; Description : Hotkey Bar related functions.
	3
	4	;
[399]	5	; XTIDE Universal BIOS and Associated Tools
[526]	6	; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
[392]	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.
[399]	12	;
[392]	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
	16	; GNU General Public License for more details.
[399]	17	; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
	18	;
[392]	19
	20	; Section containing code
	21	SECTION .text
	22
[599]	23
[392]	24	;--------------------------------------------------------------------
[599]	25	; Handler for INT 1Ch System Timer Tick.
	26	; Reads key presses and draws hotkey bar.
	27	;
	28	; HotkeyBar_TimerTickHandler
	29	; Parameters:
	30	; DS: RAMVARS segment
	31	; ES: BDA segment (zero)
	32	; Returns:
	33	; Nothing
	34	; Corrupts registers:
[601]	35	; Nothing
[599]	36	;--------------------------------------------------------------------
[601]	37	ALIGN JUMP_ALIGN
[599]	38	HotkeyBar_TimerTickHandler:
	39	push es
	40	push ds
	41	%ifdef USE_186
	42	ePUSHA
	43	%else
	44	push di
	45	push si
	46	push dx
	47	push cx
	48	push ax
	49	%endif
	50
[600]	51	;!!! Keep interrupts disabled so there won't be another
	52	; timer tick call before we are ready
	53
[599]	54	LOAD_BDA_SEGMENT_TO es, ax
	55	call RamVars_GetSegmentToDS
	56
	57	; Call previous handler
	58	pushf
[601]	59	call FAR [es:BOOTVARS.hotkeyVars+HOTKEYVARS.fpPrevTimerHandler]
[599]	60
[600]	61	; Update Hotkeybar (process key input and draw) every fourth tick
	62	test BYTE [es:BDA.dwTimerTicks], 11b
[599]	63	jnz SHORT .ReturnFromHandler
	64	call UpdateDuringDriveDetection
	65
	66	.ReturnFromHandler:
	67	%ifdef USE_186
	68	ePOPA
	69	%else
	70	pop ax
	71	pop cx
	72	pop dx
	73	pop si
	74	pop di
	75	%endif
	76	pop ds
	77	pop es
	78	iret
	79
	80
	81	;--------------------------------------------------------------------
[528]	82	; Scans key presses and draws any hotkey changes.
	83	;
[392]	84	; HotkeyBar_UpdateDuringDriveDetection
	85	; Parameters:
	86	; DS: RAMVARS segment
	87	; ES: BDA segment (zero)
	88	; Returns:
	89	; Nothing
	90	; Corrupts registers:
	91	; AX, CX, DX, SI, DI
	92	;--------------------------------------------------------------------
[599]	93	UpdateDuringDriveDetection:
[528]	94	call ScanHotkeysFromKeyBufferAndStoreToBootvars
[599]	95
	96	; If ESC pressed, abort detection by forcing timeout
	97	cmp al, ESC_SCANCODE
	98	jne SHORT .ContinueDrawing
	99	mov BYTE [RAMVARS.bTimeoutTicksLeft], 0
	100	.ContinueDrawing:
[392]	101	; Fall to HotkeyBar_DrawToTopOfScreen
[505]	102
	103
[392]	104	;--------------------------------------------------------------------
	105	; HotkeyBar_DrawToTopOfScreen
	106	; Parameters:
	107	; DS: RAMVARS segment
	108	; ES: BDA segment (zero)
	109	; Returns:
	110	; Nothing
	111	; Corrupts registers:
	112	; AX, CX, DX, SI, DI
	113	;--------------------------------------------------------------------
	114	HotkeyBar_DrawToTopOfScreen:
	115	; Store current screen coordinates to be restored
	116	; when Hotkey Bar is rendered
	117	call DetectPrint_GetSoftwareCoordinatesToAX
	118	push ax
	119
	120	call MoveCursorToScreenTopLeftCorner
	121	; Fall to .PrintFloppyDriveHotkeys
	122
	123	;--------------------------------------------------------------------
	124	; .PrintFloppyDriveHotkeys
	125	; Parameters:
	126	; DS: RAMVARS segment
	127	; ES: BDA segment (zero)
	128	; Returns:
	129	; Nothing
	130	; Corrupts registers:
	131	; AX, CX, DX, SI, DI
	132	;--------------------------------------------------------------------
	133	.PrintFloppyDriveHotkeys:
	134	call FloppyDrive_GetCountToAX
[568]	135	xchg cx, ax ; Any Floppy Drives?
	136	jcxz .SkipFloppyDriveHotkeys
[392]	137
[492]	138	mov ax, (ANGLE_QUOTE_RIGHT << 8) \| DEFAULT_FLOPPY_DRIVE_LETTER
[500]	139	mov cl, [es:BOOTVARS.hotkeyVars+HOTKEYVARS.bFddLetter]
[492]	140	mov di, g_szFDD
[593]	141
	142	; Clear CH if floppy drive is selected for boot
[601]	143	%if 0 ; Not needed until more flags added
	144	mov ch, FLG_HOTKEY_HD_FIRST
	145	and ch, [es:BOOTVARS.hotkeyVars+HOTKEYVARS.bFlags]
	146	%else
[593]	147	mov ch, [es:BOOTVARS.hotkeyVars+HOTKEYVARS.bFlags]
[601]	148	%endif
[392]	149	call FormatDriveHotkeyString
	150
	151	.SkipFloppyDriveHotkeys:
	152	; Fall to .PrintHardDriveHotkeys
	153
	154	;--------------------------------------------------------------------
	155	; .PrintHardDriveHotkeys
	156	; Parameters:
	157	; DS: RAMVARS segment
	158	; ES: BDA segment (zero)
	159	; Returns:
	160	; Nothing
	161	; Corrupts registers:
	162	; AX, CX, DX, SI, DI
	163	;--------------------------------------------------------------------
[547]	164	call BootVars_GetLetterForFirstHardDriveToAX
[392]	165	mov ah, ANGLE_QUOTE_RIGHT
[596]	166	mov cx, [es:BOOTVARS.hotkeyVars+HOTKEYVARS.wHddLetterAndFlags] ; Letter to CL, flags to CH
[600]	167	;and ch, FLG_HOTKEY_HD_FIRST ; Not needed until more flags added
[593]	168	xor ch, FLG_HOTKEY_HD_FIRST ; Clear CH if HD is selected for boot, set otherwise
[492]	169	mov di, g_szHDD
[392]	170	call FormatDriveHotkeyString
	171	; Fall to .PrintBootMenuHotkey
	172
	173	;--------------------------------------------------------------------
	174	; .PrintBootMenuHotkey
	175	; Parameters:
	176	; ES: BDA segment (zero)
	177	; Returns:
	178	; Nothing
	179	; Corrupts registers:
	180	; AX, CX, DX, SI, DI
	181	;--------------------------------------------------------------------
	182	.PrintBootMenuHotkey:
	183	%ifdef MODULE_BOOT_MENU
[492]	184	mov ax, BOOT_MENU_HOTKEY_SCANCODE \| ('2' << 8)
	185	mov di, g_szBootMenu
[392]	186	call FormatFunctionHotkeyString
	187	%endif
[492]	188	; Fall to .PrintComDetectHotkey
[392]	189
	190	;--------------------------------------------------------------------
[492]	191	; .PrintComDetectHotkey
	192	; Parameters:
	193	; ES: BDA segment (zero)
	194	; Returns:
	195	; Nothing
	196	; Corrupts registers:
	197	; AX, CX, DX, SI, DI
	198	;--------------------------------------------------------------------
	199	.PrintComDetectHotkey:
	200	%ifdef MODULE_SERIAL
	201	mov ax, COM_DETECT_HOTKEY_SCANCODE \| ('6' << 8)
	202	mov di, g_szHotComDetect
	203	call FormatFunctionHotkeyString
	204	%endif
[505]	205	; Fall to .PrintRomBootHotkey
[492]	206
	207	;--------------------------------------------------------------------
[392]	208	; .PrintRomBootHotkey
	209	; Parameters:
	210	; ES: BDA segment (zero)
	211	; Returns:
	212	; Nothing
	213	; Corrupts registers:
	214	; AX, CX, DX, SI, DI
	215	;--------------------------------------------------------------------
	216	.PrintRomBootHotkey:
[492]	217	mov ax, ROM_BOOT_HOTKEY_SCANCODE \| ('8' << 8)
	218	mov di, g_szRomBoot
[392]	219	call FormatFunctionHotkeyString
	220	; Fall to .EndHotkeyBarRendering
	221
	222	;--------------------------------------------------------------------
	223	; .EndHotkeyBarRendering
	224	; Parameters:
	225	; Stack: Screen coordinates before drawing Hotkey Bar
	226	; Returns:
	227	; Nothing
	228	; Corrupts registers:
	229	; AX, CX, DI
	230	;--------------------------------------------------------------------
	231	.EndHotkeyBarRendering:
	232	call HotkeyBar_ClearRestOfTopRow
	233	pop ax
	234	jmp SHORT HotkeyBar_RestoreCursorCoordinatesFromAX
	235
	236
	237	;--------------------------------------------------------------------
	238	; HotkeyBar_ClearRestOfTopRow
	239	; Parameters:
	240	; Nothing
	241	; Returns:
	242	; Nothing
	243	; Corrupts registers:
	244	; AX, CX, DI
	245	;--------------------------------------------------------------------
	246	HotkeyBar_ClearRestOfTopRow:
[505]	247	CALL_DISPLAY_LIBRARY GetColumnsToALandRowsToAH
[392]	248	eMOVZX cx, al
[505]	249	CALL_DISPLAY_LIBRARY GetSoftwareCoordinatesToAX
[392]	250	sub cl, al
	251	mov al, ' '
[505]	252	JMP_DISPLAY_LIBRARY PrintRepeatedCharacterFromALwithCountInCX
[392]	253
	254
	255	;--------------------------------------------------------------------
	256	; FormatDriveHotkeyString
	257	; Parameters:
[593]	258	; CH: Zero if letter in CL is selected for boot
[392]	259	; CL: Drive letter hotkey from BOOTVARS
[492]	260	; AL: First character for drive key string
	261	; AH: Second character for drive key string (ANGLE_QUOTE_RIGHT)
[392]	262	; SI: Offset to hotkey description string
	263	; ES: BDA segment (zero)
	264	; Returns:
	265	; Nothing
	266	; Corrupts registers:
	267	; AX, CX, DX, SI, DI
	268	;--------------------------------------------------------------------
[593]	269	FormatDriveHotkeyString:
	270	; Invalid scancodes are filtered on HotkeyBar_StoreHotkeyToBootvarsIfValidKeystrokeInAX
	271	; so here we have either drive letter or function key pressed. If latter, draw
	272	; drive letters as unselected
	273	cmp BYTE [es:BOOTVARS.hotkeyVars+HOTKEYVARS.bScancode], FIRST_FUNCTION_KEY_SCANCODE
	274	jae SHORT GetNonSelectedHotkeyDescriptionAttributeToDX
[392]	275
[593]	276	; Drive selected to boot from?
	277	test ch, ch
	278	jnz SHORT GetNonSelectedHotkeyDescriptionAttributeToDX
	279	jmp SHORT GetSelectedHotkeyDescriptionAttributeToDX
	280
	281
[392]	282	;--------------------------------------------------------------------
	283	; FormatFunctionHotkeyString
	284	; Parameters:
[492]	285	; AL: Scancode of function key, to know which if any to show as selected
	286	; Later replaced with an 'F' for the call to the output routine
	287	; AH: Second character for drive key string
[392]	288	; SI: Offset to hotkey description string
	289	; ES: BDA segment (zero)
	290	; Returns:
	291	; Nothing
	292	; Corrupts registers:
	293	; AX, CX, DX, SI, DI
	294	;--------------------------------------------------------------------
	295	FormatFunctionHotkeyString:
[492]	296	xor cx, cx ; Null character, eaten in output routines
[392]	297
[492]	298	cmp [es:BOOTVARS.hotkeyVars+HOTKEYVARS.bScancode], al
	299	mov al, 'F' ; Replace scancode with character for output
[392]	300
	301	%ifdef MODULE_BOOT_MENU
[492]	302
[593]	303	GetSelectedHotkeyDescriptionAttributeToDX:
[596]	304	mov si, ATTRIBUTE_CHARS.cHighlightedItem ; Selected hotkey
[593]	305	je SHORT GetDescriptionAttributeToDX ; From compare with bScancode above and from FormatDriveHotkeyString
[392]	306
	307	GetNonSelectedHotkeyDescriptionAttributeToDX:
[596]	308	mov si, ATTRIBUTE_CHARS.cItem ; Unselected hotkey
[392]	309
	310	; Display Library should not be called like this
	311	GetDescriptionAttributeToDX:
[492]	312	xchg dx, ax
[392]	313	call MenuAttribute_GetToAXfromTypeInSI
	314	xchg dx, ax ; DX = Description attribute
[505]	315	;; fall through to PushHotkeyParamsAndFormat
[392]	316
	317
[500]	318	%else ; if no MODULE_BOOT_MENU - No boot menu so use simpler attributes
	319
[593]	320	GetSelectedHotkeyDescriptionAttributeToDX:
[410]	321	mov dx, (COLOR_ATTRIBUTE(COLOR_YELLOW, COLOR_CYAN) << 8) \| MONO_REVERSE_BLINK
[593]	322	je SHORT SelectAttributeFromDHorDLbasedOnVideoMode ; From compare with bScancode above and from FormatDriveHotkeyString
[392]	323
	324	GetNonSelectedHotkeyDescriptionAttributeToDX:
[410]	325	mov dx, (COLOR_ATTRIBUTE(COLOR_BLACK, COLOR_CYAN) << 8) \| MONO_REVERSE
[492]	326
[410]	327	SelectAttributeFromDHorDLbasedOnVideoMode:
[500]	328	mov ch, [es:BDA.bVidMode] ; We only need to preserve CL
	329	shr ch, 1
[410]	330	jnc SHORT .AttributeLoadedToDL ; Black & White modes
[500]	331	shr ch, 1
[410]	332	jnz SHORT .AttributeLoadedToDL ; MDA
	333	mov dl, dh
	334	.AttributeLoadedToDL:
[505]	335	;; fall through to PushHotkeyParamsAndFormat
[410]	336
[492]	337	%endif ; MODULE_BOOT_MENU
[392]	338
	339
	340	;--------------------------------------------------------------------
	341	; PushHotkeyParamsAndFormat
	342	; Parameters:
[500]	343	; AL: First character
	344	; AH: Second character
[392]	345	; DX: Description Attribute
	346	; CX: Description string parameter
[492]	347	; CS:DI: Description string
[392]	348	; Returns:
	349	; Nothing
	350	; Corrupts registers:
	351	; AX, SI, DI
	352	;--------------------------------------------------------------------
	353	PushHotkeyParamsAndFormat:
	354	push bp
	355	mov bp, sp
	356
[492]	357	mov si, MONO_BRIGHT
[392]	358
[492]	359	push si ; Key attribute
	360	push ax ; First Character
	361	mov al, ah
	362	push ax ; Second Character
	363
[392]	364	push dx ; Description attribute
[492]	365	push di ; Description string
[392]	366	push cx ; Description string parameter
[505]	367
[492]	368	push si ; Key attribute for last space
[392]	369
	370	mov si, g_szHotkey
	371	jmp DetectPrint_FormatCSSIfromParamsInSSBP
	372
	373
	374	;--------------------------------------------------------------------
	375	; MoveCursorToScreenTopLeftCorner
	376	; Parameters:
	377	; Nothing
	378	; Returns:
	379	; Nothing
	380	; Corrupts registers:
	381	; AX, DI
	382	;--------------------------------------------------------------------
	383	MoveCursorToScreenTopLeftCorner:
	384	xor ax, ax ; Top left corner (0, 0)
	385	; Fall to HotkeyBar_RestoreCursorCoordinatesFromAX
	386
	387
	388	;--------------------------------------------------------------------
	389	; HotkeyBar_RestoreCursorCoordinatesFromAX
	390	; Parameters:
	391	; Nothing
	392	; Returns:
	393	; Nothing
	394	; Corrupts registers:
	395	; AX, DI
	396	;--------------------------------------------------------------------
	397	HotkeyBar_RestoreCursorCoordinatesFromAX:
[505]	398	JMP_DISPLAY_LIBRARY SetCursorCoordinatesFromAX
[392]	399
	400
	401	;--------------------------------------------------------------------
[599]	402	; HotkeyBar_StoreDefaultDriveLettersToHotkeyVars
	403	; Parameters:
	404	; ES: BDA Segment
	405	; Returns:
	406	; Nothing
	407	; Corrupts registers:
	408	; AX
	409	;--------------------------------------------------------------------
	410	HotkeyBar_StoreDefaultDriveLettersToHotkeyVars:
	411	call BootVars_GetLetterForFirstHardDriveToAX
	412	mov ah, DEFAULT_FLOPPY_DRIVE_LETTER
	413	xchg al, ah
	414	mov [es:BOOTVARS.hotkeyVars+HOTKEYVARS.wFddAndHddLetters], ax
	415	ret
	416
	417
	418	;--------------------------------------------------------------------
	419	; HotkeyBar_InitializeVariables
	420	; Parameters:
	421	; DS: RAMVARS Segment
	422	; ES: BDA Segment
	423	; Returns:
	424	; Nothing
	425	; Corrupts registers:
	426	; AX, CX, DX, DI
	427	;--------------------------------------------------------------------
	428	HotkeyBar_InitializeVariables:
	429	push ds
	430	push es
	431	pop ds
	432
	433	; Store system 1Ch Timer Tick handler and install our hotkeybar handler
[601]	434	mov ax, [BIOS_SYSTEM_TIMER_TICK_INTERRUPT_1Ch*4]
[599]	435	mov [BOOTVARS.hotkeyVars+HOTKEYVARS.fpPrevTimerHandler], ax
[601]	436	mov ax, [BIOS_SYSTEM_TIMER_TICK_INTERRUPT_1Ch*4+2]
[599]	437	mov [BOOTVARS.hotkeyVars+HOTKEYVARS.fpPrevTimerHandler+2], ax
[601]	438	mov al, BIOS_SYSTEM_TIMER_TICK_INTERRUPT_1Ch
[599]	439	mov si, HotkeyBar_TimerTickHandler
	440	call Interrupts_InstallHandlerToVectorInALFromCSSI
	441
	442	; Store time when hotkeybar is displayed
	443	; (it will be displayed after initialization is complete)
	444	call TimerTicks_ReadFromBdaToAX
	445	mov [BOOTVARS.hotkeyVars+HOTKEYVARS.wTimeWhenDisplayed], ax
	446
	447	pop ds
	448
	449	; Initialize HOTKEYVARS by storing default drives to boot from
	450	call HotkeyBar_StoreDefaultDriveLettersToHotkeyVars
	451	mov dl, [cs:ROMVARS.bBootDrv]
	452	; Fall to HotkeyBar_StoreHotkeyToBootvarsForDriveNumberInDL
	453
	454
	455	;--------------------------------------------------------------------
[528]	456	; HotkeyBar_StoreHotkeyToBootvarsForDriveNumberInDL
[395]	457	; Parameters:
	458	; DS: RAMVARS segment
	459	; ES: BDA segment (zero)
[528]	460	; DL: Drive Number
	461	; Returns:
	462	; Nothing
	463	; Corrupts registers:
	464	; AX, CX, DL, DI
	465	;--------------------------------------------------------------------
	466	HotkeyBar_StoreHotkeyToBootvarsForDriveNumberInDL:
	467	call DriveXlate_ConvertDriveNumberFromDLtoDriveLetter
	468	; Fall to StoreHotkeyToBootvarsForDriveLetterInDL
	469
	470
	471	;--------------------------------------------------------------------
	472	; StoreHotkeyToBootvarsForDriveLetterInDL
	473	; Parameters:
	474	; DS: RAMVARS segment
	475	; ES: BDA segment (zero)
[395]	476	; DL: Drive Letter ('A'...)
	477	; Returns:
	478	; Nothing
	479	; Corrupts registers:
	480	; AX, CX, DI
	481	;--------------------------------------------------------------------
[528]	482	StoreHotkeyToBootvarsForDriveLetterInDL:
[395]	483	eMOVZX ax, dl
[505]	484	or al, 32 ; Upper case drive letter to lower case keystroke
[395]	485	jmp SHORT HotkeyBar_StoreHotkeyToBootvarsIfValidKeystrokeInAX
	486
	487
	488	;--------------------------------------------------------------------
[528]	489	; ScanHotkeysFromKeyBufferAndStoreToBootvars
[392]	490	; Parameters:
	491	; DS: RAMVARS segment
	492	; ES: BDA segment (zero)
	493	; Returns:
[492]	494	; AL: Last scancode value
[392]	495	; Corrupts registers:
[492]	496	; AH, CX
[392]	497	;--------------------------------------------------------------------
[528]	498	ScanHotkeysFromKeyBufferAndStoreToBootvars:
[392]	499	call Keyboard_GetKeystrokeToAX
	500	jz SHORT NoHotkeyToProcess
	501
[528]	502	; Prepare to read another key from buffer
	503	ePUSH_T cx, ScanHotkeysFromKeyBufferAndStoreToBootvars
[392]	504	; Fall to HotkeyBar_StoreHotkeyToBootvarsIfValidKeystrokeInAX
	505
	506
	507	;--------------------------------------------------------------------
	508	; HotkeyBar_StoreHotkeyToBootvarsIfValidKeystrokeInAX
	509	; Parameters:
	510	; AL: Hotkey ASCII code
	511	; AH: Hotkey Scancode
	512	; DS: RAMVARS segment
	513	; ES: BDA segment (zero)
	514	; Returns:
[567]	515	; AL: Last scancode seen
[528]	516	; CF: Set if valid hotkey in AL
	517	; Clear if scancode in AL is not for any hotkey
[392]	518	; Corrupts registers:
[492]	519	; AH, CX, DI
[392]	520	;--------------------------------------------------------------------
	521	HotkeyBar_StoreHotkeyToBootvarsIfValidKeystrokeInAX:
[492]	522	mov di, BOOTVARS.hotkeyVars+HOTKEYVARS.bScancode
[392]	523
[492]	524	; All scancodes are saved, even if it wasn't a drive letter,
	525	; which also covers our function key case. Invalid function keys
[505]	526	; will not do anything (won't be printed, won't be accepted as input)
[492]	527	mov [es:di], ah
[505]	528
[392]	529	; Drive letter hotkeys remaining, allow 'a' to 'z'
	530	call Char_IsLowerCaseLetterInAL
[492]	531	jnc SHORT .KeystrokeIsNotValidDriveLetter
[505]	532	and al, ~32 ; We want to print upper case letters
[392]	533
	534	; Clear HD First flag to assume Floppy Drive hotkey
[492]	535	dec di
[392]	536	and BYTE [es:di], ~FLG_HOTKEY_HD_FIRST
	537
	538	; Determine if Floppy or Hard Drive hotkey
[505]	539	xchg cx, ax
[547]	540	call BootVars_GetLetterForFirstHardDriveToAX
[392]	541	cmp cl, al
	542	jb SHORT .StoreDriveLetter ; Store Floppy Drive letter
	543
	544	; Store Hard Drive letter
	545	or BYTE [es:di], FLG_HOTKEY_HD_FIRST
	546
	547	.StoreDriveLetter:
[505]	548	sbb di, BYTE 1 ; Sub CF if Floppy Drive
[392]	549	xchg ax, cx
[592]	550	stosb
[528]	551	stc ; Valid hotkey scancode returned in AL
[392]	552
[505]	553	.KeystrokeIsNotValidDriveLetter:
[392]	554	NoHotkeyToProcess:
[492]	555	mov al, [es:BOOTVARS.hotkeyVars+HOTKEYVARS.bScancode]
[392]	556	ret
	557
[528]	558
[392]	559	;--------------------------------------------------------------------
[492]	560	; HotkeyBar_GetBootDriveNumbersToDX
[392]	561	; Parameters:
	562	; DS: RAMVARS segment
	563	; ES: BDA segment (zero)
	564	; Returns:
[492]	565	; DX: Drives selected as boot device, DL is primary
[392]	566	; Corrupts registers:
[492]	567	; AX
[392]	568	;--------------------------------------------------------------------
[492]	569	HotkeyBar_GetBootDriveNumbersToDX:
[500]	570	mov dx, [es:BOOTVARS.hotkeyVars+HOTKEYVARS.wFddAndHddLetters]
[600]	571
	572	; HotkeyBar_GetBootDriveNumbersToDX is called when all drives are detected and
	573	; drive letters are known.
	574	; Replace unavailable hard drive letter with first hard drive.
	575	; If we have boot menu, it will be displayed instead.
	576	%ifndef MODULE_BOOT_MENU
	577	call BootVars_GetLetterForFirstHardDriveToAX
	578	mov ah, al
	579	add al, [es:BDA.bHDCount] ; AL now contains first unavailable HD letter
	580	cmp dh, al ; Unavailable drive?
	581	jb SHORT .ValidHardDriveLetterInDH
	582	mov dh, ah ; Replace unavailable drive with first drive
	583	.ValidHardDriveLetterInDH:
	584	%endif
	585
[505]	586	test BYTE [es:BOOTVARS.hotkeyVars+HOTKEYVARS.bFlags], FLG_HOTKEY_HD_FIRST
[600]	587	jnz SHORT .noflip
[392]	588	xchg dl, dh
[505]	589	.noflip:
[492]	590	call DriveXlate_ConvertDriveLetterInDLtoDriveNumber
	591	xchg dl, dh
[505]	592	; Fall to HotkeyBar_FallThroughTo_DriveXlate_ConvertDriveLetterInDLtoDriveNumber
[392]	593
[505]	594	HotkeyBar_FallThroughTo_DriveXlate_ConvertDriveLetterInDLtoDriveNumber:
	595

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source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Menus/HotkeyBar.asm@ 602

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