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source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/AH0h_HReset.asm@ 243

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Last change on this file since 243 was 152, checked in by Tomi Tilli, 13 years ago

Changes to XTIDE Universal BIOS:

XTIDE mod should now be supported (untested).
Interrupt Service Routine no longer requires variable from RAMVARS.
Some small improvements.

File size: 5.6 KB

Rev	Line
[128]	1	; Project name : XTIDE Universal BIOS
[3]	2	; Description : Int 13h function AH=0h, Disk Controller Reset.
	3
	4	; Section containing code
	5	SECTION .text
	6
	7	;--------------------------------------------------------------------
	8	; Int 13h function AH=0h, Disk Controller Reset.
	9	;
	10	; AH0h_HandlerForDiskControllerReset
	11	; Parameters:
[148]	12	; DL: Translated Drive number (ignored so all drives are reset)
[3]	13	; If bit 7 is set all hard disks and floppy disks reset.
[148]	14	; DS:DI: Ptr to DPT (in RAMVARS segment)
[150]	15	; SS:BP: Ptr to IDEPACK
	16	; Returns with INTPACK:
[23]	17	; AH: Int 13h return status (from drive requested in DL)
[3]	18	; CF: 0 if succesfull, 1 if error
	19	;--------------------------------------------------------------------
	20	ALIGN JUMP_ALIGN
	21	AH0h_HandlerForDiskControllerReset:
[23]	22	eMOVZX bx, dl ; Copy requested drive to BL, zero BH to assume no errors
[26]	23	call ResetFloppyDrivesWithInt40h
[128]	24	test bl, bl
	25	jns SHORT .SkipHardDiskReset
[26]	26	call ResetForeignHardDisks
[27]	27	call AH0h_ResetHardDisksHandledByOurBIOS
[26]	28	.SkipHardDiskReset:
[148]	29	mov ah, bh
	30	jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
[3]	31
	32
	33	;--------------------------------------------------------------------
[26]	34	; ResetFloppyDrivesWithInt40h
[3]	35	; Parameters:
[23]	36	; BL: Requested drive (DL when entering AH=00h)
	37	; Returns:
	38	; BH: Error code from requested drive (if available)
	39	; Corrupts registers:
[27]	40	; AX, DL, DI
[128]	41	;--------------------------------------------------------------------
[23]	42	ALIGN JUMP_ALIGN
[26]	43	ResetFloppyDrivesWithInt40h:
[27]	44	call GetDriveNumberForForeignBiosesToDL
	45	and dl, 7Fh ; Clear hard disk bit
[26]	46	xor ah, ah ; Disk Controller Reset
[148]	47	int BIOS_DISKETTE_INTERRUPT_40h
[26]	48	jmp SHORT BackupErrorCodeFromTheRequestedDriveToBH
[23]	49
	50
	51	;--------------------------------------------------------------------
[26]	52	; ResetForeignHardDisks
[23]	53	; Parameters:
	54	; BL: Requested drive (DL when entering AH=00h)
[3]	55	; DS: RAMVARS segment
	56	; Returns:
[23]	57	; BH: Error code from requested drive (if available)
[3]	58	; Corrupts registers:
[27]	59	; AX, DL, DI
[128]	60	;--------------------------------------------------------------------
[23]	61	ALIGN JUMP_ALIGN
[26]	62	ResetForeignHardDisks:
[27]	63	call GetDriveNumberForForeignBiosesToDL
	64	xor ah, ah ; Disk Controller Reset
[32]	65	call Int13h_CallPreviousInt13hHandler
[26]	66	jmp SHORT BackupErrorCodeFromTheRequestedDriveToBH
[23]	67
[26]	68
[3]	69	;--------------------------------------------------------------------
[27]	70	; GetDriveNumberForForeignBiosesToDL
	71	; Parameters:
	72	; BL: Requested drive (DL when entering AH=00h)
	73	; DS: RAMVARS segment
	74	; Returns:
	75	; DL: BL if foreign drive
	76	; 80h if our drive
	77	; Corrupts registers:
	78	; DI
[128]	79	;--------------------------------------------------------------------
[27]	80	ALIGN JUMP_ALIGN
	81	GetDriveNumberForForeignBiosesToDL:
	82	mov dl, bl
	83	call RamVars_IsDriveHandledByThisBIOS
[84]	84	jnc SHORT .Return ; Return what was in BL unmodified
	85	mov dl, 80h
	86	.Return:
[27]	87	ret
	88
	89
	90	;--------------------------------------------------------------------
[150]	91	; AH0h_ResetHardDisksHandledByOurBIOS
[23]	92	; Parameters:
	93	; BL: Requested drive (DL when entering AH=00h)
	94	; DS: RAMVARS segment
[150]	95	; SS:BP: Ptr to IDEPACK
[23]	96	; Returns:
	97	; BH: Error code from requested drive (if available)
	98	; Corrupts registers:
[150]	99	; AX, CX, DX, SI, DI
[23]	100	;--------------------------------------------------------------------
[3]	101	ALIGN JUMP_ALIGN
[27]	102	AH0h_ResetHardDisksHandledByOurBIOS:
[26]	103	mov dh, [RAMVARS.bDrvCnt] ; Load drive count to DH
	104	test dh, dh
	105	jz SHORT .AllDrivesReset ; Return if no drives
[150]	106	mov dl, [RAMVARS.bFirstDrv] ; Load number of our first drive
[26]	107	add dh, dl ; DH = one past last drive to reset
[3]	108	ALIGN JUMP_ALIGN
[26]	109	.DriveResetLoop:
	110	call AHDh_ResetDrive
[27]	111	call .BackupErrorCodeFromMasterOrSlaveToBH
[26]	112	inc dx
	113	cmp dl, dh ; All done?
	114	jb SHORT .DriveResetLoop ; If not, reset next drive
	115	.AllDrivesReset:
[3]	116	ret
	117
	118	;--------------------------------------------------------------------
[27]	119	; .BackupErrorCodeFromMasterOrSlaveToBH
[3]	120	; Parameters:
[27]	121	; AH: Error code for drive DL reset
	122	; BL: Requested drive (DL when entering AH=00h)
[26]	123	; DL: Drive just resetted
[3]	124	; DS: RAMVARS segment
	125	; Returns:
[27]	126	; BH: Backuped error code
[26]	127	; DL: Incremented if next drive is slave drive
	128	; (=already resetted)
[3]	129	; Corrupts registers:
[27]	130	; CX, DI
[3]	131	;--------------------------------------------------------------------
	132	ALIGN JUMP_ALIGN
[27]	133	.BackupErrorCodeFromMasterOrSlaveToBH:
	134	call BackupErrorCodeFromTheRequestedDriveToBH
[150]	135	call GetBasePortToCX ; Load base port for resetted drive
	136	push cx
[27]	137	inc dx ; DL to next drive
[150]	138	call GetBasePortToCX
	139	pop di
	140	cmp cx, di ; Next drive is from same controller?
[27]	141	je SHORT BackupErrorCodeFromTheRequestedDriveToBH
	142	.NoMoreDrivesOrNoSlaveDrive:
	143	dec dx
[3]	144	ret
	145
[150]	146	;--------------------------------------------------------------------
	147	; GetBasePortToCX
	148	; Parameters:
	149	; DL: Drive number
	150	; DS: RAMVARS segment
	151	; Returns:
	152	; CX: Base port address
	153	; CF: Set if valid drive number
	154	; Cleared if invalid drive number
	155	; Corrupts registers:
	156	; DI
	157	;--------------------------------------------------------------------
	158	ALIGN JUMP_ALIGN
	159	GetBasePortToCX:
	160	xchg cx, bx
	161	xor bx, bx
	162	call FindDPT_ForDriveNumber
	163	mov bl, [di+DPT.bIdevarsOffset]
	164	mov bx, [cs:bx+IDEVARS.wPort]
	165	xchg bx, cx
	166	ret
[3]	167
[150]	168
[3]	169	;--------------------------------------------------------------------
[26]	170	; BackupErrorCodeFromTheRequestedDriveToBH
[3]	171	; Parameters:
[23]	172	; AH: Error code from the last resetted drive
	173	; DL: Drive last resetted
	174	; BL: Requested drive (DL when entering AH=00h)
[3]	175	; Returns:
[23]	176	; BH: Backuped error code
[3]	177	; Corrupts registers:
	178	; Nothing
	179	;--------------------------------------------------------------------
	180	ALIGN JUMP_ALIGN
[26]	181	BackupErrorCodeFromTheRequestedDriveToBH:
	182	cmp dl, bl ; Requested drive?
[148]	183	eCMOVE bh, ah
[3]	184	ret

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