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source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/CreateDPT.asm@ 533

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Last change on this file since 533 was 533, checked in by aitotat@…, 12 years ago

Changes to XTIDE Universal BIOS:

P-Cylinders returned by AH=48h are now calculated from L-CHS capacity when RESERVE_DIAGNOSTIC_CYLINDER is defined.
Total sector count returned by AH=48h is now always P-Cylinders * P-Heads * P-Sectors per track for drives with less than or equal 15,482,880 LBA sectors.

File size: 11.9 KB

Rev	Line
[99]	1	; Project name : XTIDE Universal BIOS
[3]	2	; Description : Functions for creating Disk Parameter Table.
	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
[3]	20	; Section containing code
	21	SECTION .text
	22
	23	;--------------------------------------------------------------------
	24	; Creates new Disk Parameter Table for detected hard disk.
	25	; Drive is then fully accessible using any BIOS function.
	26	;
	27	; CreateDPT_FromAtaInformation
	28	; Parameters:
	29	; BH: Drive Select byte for Drive and Head Register
[473]	30	; DX: Autodetected port (for devices that support autodetection)
[3]	31	; ES:SI: Ptr to 512-byte ATA information read from the drive
	32	; CS:BP: Ptr to IDEVARS for the controller
	33	; DS: RAMVARS segment
	34	; ES: BDA Segment
	35	; Returns:
[294]	36	; DS:DI: Ptr to Disk Parameter Table (if successful)
[3]	37	; CF: Cleared if DPT created successfully
	38	; Set if any error
	39	; Corrupts registers:
[99]	40	; AX, BX, CX, DH
[3]	41	;--------------------------------------------------------------------
	42	CreateDPT_FromAtaInformation:
[150]	43	call FindDPT_ForNewDriveToDSDI
[99]	44	; Fall to .InitializeDPT
[3]	45
	46	;--------------------------------------------------------------------
[99]	47	; .InitializeDPT
[3]	48	; Parameters:
	49	; BH: Drive Select byte for Drive and Head Register
[473]	50	; DX: Autodetected port (for devices that support autodetection)
[3]	51	; DS:DI: Ptr to Disk Parameter Table
	52	; CS:BP: Ptr to IDEVARS for the controller
	53	; Returns:
[150]	54	; Nothing
[3]	55	; Corrupts registers:
[150]	56	; AX
[3]	57	;--------------------------------------------------------------------
[99]	58	.InitializeDPT:
[473]	59	call CreateDPT_StoreIdevarsOffsetAndBasePortFromCSBPtoDPTinDSDI
[150]	60	; Fall to .StoreDriveSelectAndDriveControlByte
[3]	61
	62	;--------------------------------------------------------------------
[150]	63	; .StoreDriveSelectAndDriveControlByte
[3]	64	; Parameters:
	65	; BH: Drive Select byte for Drive and Head Register
	66	; DS:DI: Ptr to Disk Parameter Table
	67	; ES:SI: Ptr to 512-byte ATA information read from the drive
	68	; CS:BP: Ptr to IDEVARS for the controller
	69	; Returns:
[99]	70	; Nothing
[3]	71	; Corrupts registers:
	72	; AX
	73	;--------------------------------------------------------------------
[150]	74	.StoreDriveSelectAndDriveControlByte:
	75	mov al, bh
	76	and ax, BYTE FLG_DRVNHEAD_DRV ; AL now has Master/Slave bit
[411]	77	%ifdef MODULE_IRQ
[150]	78	cmp [cs:bp+IDEVARS.bIRQ], ah ; Interrupts enabled?
	79	jz SHORT .StoreFlags ; If not, do not set interrupt flag
[158]	80	or al, FLGL_DPT_ENABLE_IRQ
[150]	81	.StoreFlags:
[411]	82	%endif
[150]	83	mov [di+DPT.wFlags], ax
[421]	84	; Fall to .StoreCHSparametersAndAddressingMode
[3]	85
	86	;--------------------------------------------------------------------
[421]	87	; .StoreCHSparametersAndAddressingMode
[3]	88	; Parameters:
	89	; DS:DI: Ptr to Disk Parameter Table
	90	; ES:SI: Ptr to 512-byte ATA information read from the drive
	91	; CS:BP: Ptr to IDEVARS for the controller
	92	; Returns:
[227]	93	; Nothing
[3]	94	; Corrupts registers:
[227]	95	; AX, BX, CX, DX
[3]	96	;--------------------------------------------------------------------
[421]	97	.StoreCHSparametersAndAddressingMode:
[173]	98	; Check if CHS defined in ROMVARS
[422]	99	call GetUserDefinedCapacityToBXAXandFlagsToCXandModeToDXfromROMVARS
	100	test cl, FLG_DRVPARAMS_USERCHS
[421]	101	jz SHORT .AutodetectPCHSvalues
[173]	102
[422]	103	; Translate P-CHS to L-CHS
	104	call AtaGeometry_GetLCHStoAXBLBHfromPCHSinAXBLBHandTranslateModeInDX
[421]	105	jmp SHORT .StoreLCHStoDPT
	106	.AutodetectPCHSvalues:
[422]	107	call AtaGeometry_GetLCHStoAXBLBHfromAtaInfoInESSIandTranslateModeInDX
[421]	108
	109	.StoreLCHStoDPT:
[422]	110	eSHL_IM dl, TRANSLATEMODE_FIELD_POSITION
[421]	111	or cl, dl
	112	or [di+DPT.bFlagsLow], cl ; Shift count and addressing mode
	113	mov [di+DPT.wLchsCylinders], ax
	114	mov [di+DPT.wLchsHeadsAndSectors], bx
	115
	116	; Store P-CHS to DPT
	117	call AtaGeometry_GetPCHStoAXBLBHfromAtaInfoInESSI
	118	mov [di+DPT.bPchsHeads], bl
	119	%ifdef MODULE_EBIOS
[533]	120	mov [di+DPT.bPchsSectorsPerTrack], bh
	121
	122	%ifdef RESERVE_DIAGNOSTIC_CYLINDER
	123	; Do not store P-Cylinders, instead calculate it from L-CHS total sector count.
	124	; Read AH=48h_GetExtendedDriveParameters.asm for more info.
	125	xchg ax, bx
	126	mul ah
	127	push ax ; P-Heads * P-Sectors per track
	128	call AH15h_GetSectorCountToBXDXAX
	129	pop bx
	130	div bx ; AX = Calculated cylinders
	131	%endif ; RESERVE_DIAGNOSTIC_CYLINDER
	132
[421]	133	mov [di+DPT.wPchsCylinders], ax
	134	; Fall to .StoreNumberOfLbaSectors
	135
	136	;--------------------------------------------------------------------
	137	; .StoreNumberOfLbaSectors
	138	; Parameters:
	139	; DS:DI: Ptr to Disk Parameter Table
	140	; ES:SI: Ptr to 512-byte ATA information read from the drive
	141	; CS:BP: Ptr to IDEVARS for the controller
	142	; Returns:
	143	; Nothing
	144	; Corrupts registers:
	145	; AX, BX, CX, DX
	146	;--------------------------------------------------------------------
[173]	147	; Check if LBA supported
	148	test BYTE [es:si+ATA1.wCaps+1], A1_wCaps_LBA>>8
[421]	149	jz SHORT .NoLbaSupportedSoNoEBIOS
[3]	150
[421]	151	; Store LBA 28/48 total sector count
	152	call AtaGeometry_GetLbaSectorCountToBXDXAXfromAtaInfoInESSI
	153	call StoreLba48AddressingFromCLandTotalSectorCountFromBXDXAX
[324]	154
[533]	155	; If we have 15,482,880 or less sectors, we multiply P-CHS values
	156	; and use that as total sector count.
	157	; Read AH=48h_GetExtendedDriveParameters.asm for more info.
	158	sub ax, 4001h
	159	sbb dx, 0ECh
	160	sbb bx, BYTE 0
	161	jnc SHORT .NoNeedToUseCHSsectorCount ; More than EC4000h
	162
	163	mov al, [di+DPT.bPchsHeads]
	164	mul BYTE [di+DPT.bPchsSectorsPerTrack]
	165	mul WORD [di+DPT.wPchsCylinders]
	166	xor bx, bx
	167	call StoreLba48AddressingFromCLandTotalSectorCountFromBXDXAX
	168
[421]	169	; Load user defined LBA
[533]	170	.NoNeedToUseCHSsectorCount:
[422]	171	call GetUserDefinedCapacityToBXAXandFlagsToCXandModeToDXfromROMVARS
	172	test cl, FLG_DRVPARAMS_USERLBA
[324]	173	jz SHORT .KeepTotalSectorsFromAtaID
	174
	175	; Compare user defined and ATA-ID sector count and select smaller
[445]	176	mov dx, bx
	177	xor bx, bx ; User defined LBA now in BX:DX:AX
[324]	178	cmp bx, [di+DPT.twLbaSectors+4]
	179	jb SHORT .StoreUserDefinedSectorCountToDPT
	180	cmp dx, [di+DPT.twLbaSectors+2]
	181	jb SHORT .StoreUserDefinedSectorCountToDPT
	182	ja SHORT .KeepTotalSectorsFromAtaID
	183	cmp ax, [di+DPT.twLbaSectors]
	184	jae SHORT .KeepTotalSectorsFromAtaID
	185	.StoreUserDefinedSectorCountToDPT:
[422]	186	; CL bit FLGL_DPT_LBA48 is clear at this point
[421]	187	call StoreLba48AddressingFromCLandTotalSectorCountFromBXDXAX
[324]	188
	189	.KeepTotalSectorsFromAtaID:
[421]	190	.NoLbaSupportedSoNoEBIOS:
	191	%endif ; MODULE_EBIOS
[99]	192	; Fall to .StoreBlockMode
[3]	193
	194	;--------------------------------------------------------------------
[99]	195	; .StoreBlockMode
[3]	196	; Parameters:
	197	; DS:DI: Ptr to Disk Parameter Table
	198	; ES:SI: Ptr to 512-byte ATA information read from the drive
[160]	199	; CS:BP: Ptr to IDEVARS for the controller
[3]	200	; Returns:
[99]	201	; Nothing
[3]	202	; Corrupts registers:
[150]	203	; Nothing
[3]	204	;--------------------------------------------------------------------
[99]	205	.StoreBlockMode:
[150]	206	cmp BYTE [es:si+ATA1.bBlckSize], 1 ; Max block size in sectors
	207	jbe SHORT .BlockModeTransfersNotSupported
[158]	208	or BYTE [di+DPT.bFlagsHigh], FLGH_DPT_BLOCK_MODE_SUPPORTED
[150]	209	.BlockModeTransfersNotSupported:
	210	; Fall to .StoreDeviceSpecificParameters
[3]	211
	212	;--------------------------------------------------------------------
[150]	213	; .StoreDeviceSpecificParameters
[3]	214	; Parameters:
	215	; DS:DI: Ptr to Disk Parameter Table
	216	; ES:SI: Ptr to 512-byte ATA information read from the drive
[160]	217	; CS:BP: Ptr to IDEVARS for the controller
[3]	218	; Returns:
[99]	219	; Nothing
[3]	220	; Corrupts registers:
[150]	221	; AX, BX, CX, DX
[3]	222	;--------------------------------------------------------------------
[150]	223	.StoreDeviceSpecificParameters:
	224	call Device_FinalizeDPT
[258]	225
[262]	226	;----------------------------------------------------------------------
	227	; Update drive counts (hard and floppy)
[294]	228	;----------------------------------------------------------------------
	229
[258]	230	%ifdef MODULE_SERIAL_FLOPPY
	231	;
	232	; These two instructions serve two purposes:
	233	; 1. If the drive is a floppy drive (CF set), then we effectively increment the counter.
[294]	234	; 2. If this is a hard disk, and there have been any floppy drives previously added, then the hard disk is
[258]	235	; effectively discarded. This is more of a safety check then code that should ever normally be hit (see below).
[294]	236	; Since the floppy DPT's come after the hard disk DPT's, without expensive (code size) code to relocate a DPT,
[258]	237	; this was necessary. Now, this situation shouldn't happen in normal operation, for a couple of reasons:
[294]	238	; A. xtidecfg always puts configured serial ports at the end of the IDEVARS list
[258]	239	; B. the auto serial code is always executed last
	240	; C. the serial server always returns floppy drives last
	241	;
	242	adc byte [RAMVARS.xlateVars+XLATEVARS.bFlopCreateCnt], 0
[294]	243	jnz .AllDone
[258]	244	%else
	245	;
	246	; Even without floppy support enabled, we shouldn't try to mount a floppy image as a hard disk, which
[294]	247	; could lead to unpredictable results since no MBR will be present, etc. The server doesn't know that
[258]	248	; floppies are supported, so it is important to still fail here if a floppy is seen during the drive scan.
	249	;
	250	jc .AllDone
	251	%endif
	252
[150]	253	inc BYTE [RAMVARS.bDrvCnt] ; Increment drive count to RAMVARS
[294]	254
	255	.AllDone:
[162]	256	clc
[3]	257	ret
[258]	258
[324]	259
[422]	260	;--------------------------------------------------------------------
[473]	261	; CreateDPT_StoreIdevarsOffsetAndBasePortFromCSBPtoDPTinDSDI
	262	; Parameters:
	263	; DX: Autodetected port (for devices that support autodetection)
	264	; DS:DI: Ptr to Disk Parameter Table
	265	; CS:BP: Ptr to IDEVARS for the controller
	266	; Returns:
	267	; Nothing
	268	; Corrupts registers:
	269	; AX
	270	;--------------------------------------------------------------------
	271	CreateDPT_StoreIdevarsOffsetAndBasePortFromCSBPtoDPTinDSDI:
	272	mov [di+DPT.bIdevarsOffset], bp ; IDEVARS must start in first 256 bytes of ROM
	273
[493]	274	%ifdef MODULE_8BIT_IDE_ADVANCED
[473]	275	call DetectDrives_DoesIdevarsInCSBPbelongToXTCF
	276	jne SHORT .DeviceUsesPortSpecifiedInIDEVARS
	277	mov [di+DPT.wBasePort], dx
	278	ret
	279	.DeviceUsesPortSpecifiedInIDEVARS:
[493]	280	%endif ; MODULE_8BIT_IDE_ADVANCED
[473]	281
	282	mov ax, [cs:bp+IDEVARS.wBasePort]
	283	mov [di+DPT.wBasePort], ax
	284	ret
	285
	286
	287	;--------------------------------------------------------------------
[422]	288	; GetUserDefinedCapacityToBXAXandFlagsToCXandModeToDXfromROMVARS
	289	; Parameters:
	290	; DS:DI: Ptr to Disk Parameter Table
	291	; Returns:
	292	; AX: User defined P-CHS Cylinders or LBA low word
	293	; BX: User defined P-CHS Heads and Sectors or LBA high word
	294	; DX: Translate mode or TRANSLATEMODE_AUTO
	295	; CX: FLG_DRVPARAMS_USERCHS if user defined CHS in BX:AX
	296	; FLG_DRVPARAMS_USERLBA if user defined LBA in BX:AX
	297	; Zero if user has not defined capacity
	298	; Corrupts registers:
	299	; Nothing
	300	;--------------------------------------------------------------------
	301	GetUserDefinedCapacityToBXAXandFlagsToCXandModeToDXfromROMVARS:
	302	call AccessDPT_GetPointerToDRVPARAMStoCSBX
	303
	304	; Get settings
	305	mov cx, [cs:bx+DRVPARAMS.wFlags]
	306	mov dx, cx
	307	and cx, BYTE FLG_DRVPARAMS_USERCHS \| FLG_DRVPARAMS_USERLBA
	308	and dx, BYTE MASK_DRVPARAMS_TRANSLATEMODE
	309	eSHR_IM dx, TRANSLATEMODE_FIELD_POSITION
	310
	311	; Get capacity
	312	mov ax, [cs:bx+DRVPARAMS.wCylinders] ; Or .dwMaximumLBA
	313	mov bx, [cs:bx+DRVPARAMS.wHeadsAndSectors] ; Or .dwMaximumLBA+2
	314	ret
	315
	316
[421]	317	%ifdef MODULE_EBIOS
[324]	318	;--------------------------------------------------------------------
[421]	319	; StoreLba48AddressingFromCLandTotalSectorCountFromBXDXAX
[324]	320	; Parameters:
	321	; BX:DX:AX: Total Sector Count
[421]	322	; CL: FLGL_DPT_LBA48 if LBA48 supported
[324]	323	; DS:DI: Ptr to Disk Parameter Table
	324	; Returns:
	325	; Nothing
	326	; Corrupts registers:
[421]	327	; CL
[324]	328	;--------------------------------------------------------------------
[421]	329	StoreLba48AddressingFromCLandTotalSectorCountFromBXDXAX:
	330	or cl, FLGL_DPT_LBA_AND_EBIOS_SUPPORTED
	331	and BYTE [di+DPT.bFlagsLow], ~FLGL_DPT_LBA48
	332	or [di+DPT.bFlagsLow], cl
[324]	333	mov [di+DPT.twLbaSectors], ax
	334	mov [di+DPT.twLbaSectors+2], dx
	335	mov [di+DPT.twLbaSectors+4], bx
	336	ret
[421]	337	%endif ; MODULE_EBIOS

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