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source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/VariablesAndDPTs/CreateDPT.asm@ 477

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Last change on this file since 477 was 473, checked in by aitotat@…, 12 years ago

Changes to XTIDE Universal BIOS:

Large changes to prepare full XT-CF support (DMA not yet implemented and memory mapped transfers are not working).

File size: 11.0 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
[376]	6	; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team.
	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
	120	mov [di+DPT.wPchsCylinders], ax
	121	mov [di+DPT.bPchsSectorsPerTrack], bh
	122	; Fall to .StoreNumberOfLbaSectors
	123
	124	;--------------------------------------------------------------------
	125	; .StoreNumberOfLbaSectors
	126	; Parameters:
	127	; DS:DI: Ptr to Disk Parameter Table
	128	; ES:SI: Ptr to 512-byte ATA information read from the drive
	129	; CS:BP: Ptr to IDEVARS for the controller
	130	; Returns:
	131	; Nothing
	132	; Corrupts registers:
	133	; AX, BX, CX, DX
	134	;--------------------------------------------------------------------
[173]	135	; Check if LBA supported
	136	test BYTE [es:si+ATA1.wCaps+1], A1_wCaps_LBA>>8
[421]	137	jz SHORT .NoLbaSupportedSoNoEBIOS
[3]	138
[421]	139	; Store LBA 28/48 total sector count
	140	call AtaGeometry_GetLbaSectorCountToBXDXAXfromAtaInfoInESSI
	141	call StoreLba48AddressingFromCLandTotalSectorCountFromBXDXAX
[324]	142
[421]	143	; Load user defined LBA
[422]	144	call GetUserDefinedCapacityToBXAXandFlagsToCXandModeToDXfromROMVARS
	145	test cl, FLG_DRVPARAMS_USERLBA
[324]	146	jz SHORT .KeepTotalSectorsFromAtaID
	147
	148	; Compare user defined and ATA-ID sector count and select smaller
[445]	149	mov dx, bx
	150	xor bx, bx ; User defined LBA now in BX:DX:AX
[324]	151	cmp bx, [di+DPT.twLbaSectors+4]
	152	jb SHORT .StoreUserDefinedSectorCountToDPT
	153	cmp dx, [di+DPT.twLbaSectors+2]
	154	jb SHORT .StoreUserDefinedSectorCountToDPT
	155	ja SHORT .KeepTotalSectorsFromAtaID
	156	cmp ax, [di+DPT.twLbaSectors]
	157	jae SHORT .KeepTotalSectorsFromAtaID
	158	.StoreUserDefinedSectorCountToDPT:
[422]	159	; CL bit FLGL_DPT_LBA48 is clear at this point
[421]	160	call StoreLba48AddressingFromCLandTotalSectorCountFromBXDXAX
[324]	161
	162	.KeepTotalSectorsFromAtaID:
[421]	163	.NoLbaSupportedSoNoEBIOS:
	164	%endif ; MODULE_EBIOS
[99]	165	; Fall to .StoreBlockMode
[3]	166
	167	;--------------------------------------------------------------------
[99]	168	; .StoreBlockMode
[3]	169	; Parameters:
	170	; DS:DI: Ptr to Disk Parameter Table
	171	; ES:SI: Ptr to 512-byte ATA information read from the drive
[160]	172	; CS:BP: Ptr to IDEVARS for the controller
[3]	173	; Returns:
[99]	174	; Nothing
[3]	175	; Corrupts registers:
[150]	176	; Nothing
[3]	177	;--------------------------------------------------------------------
[99]	178	.StoreBlockMode:
[150]	179	cmp BYTE [es:si+ATA1.bBlckSize], 1 ; Max block size in sectors
	180	jbe SHORT .BlockModeTransfersNotSupported
[158]	181	or BYTE [di+DPT.bFlagsHigh], FLGH_DPT_BLOCK_MODE_SUPPORTED
[150]	182	.BlockModeTransfersNotSupported:
	183	; Fall to .StoreDeviceSpecificParameters
[3]	184
	185	;--------------------------------------------------------------------
[150]	186	; .StoreDeviceSpecificParameters
[3]	187	; Parameters:
	188	; DS:DI: Ptr to Disk Parameter Table
	189	; ES:SI: Ptr to 512-byte ATA information read from the drive
[160]	190	; CS:BP: Ptr to IDEVARS for the controller
[3]	191	; Returns:
[99]	192	; Nothing
[3]	193	; Corrupts registers:
[150]	194	; AX, BX, CX, DX
[3]	195	;--------------------------------------------------------------------
[150]	196	.StoreDeviceSpecificParameters:
	197	call Device_FinalizeDPT
[258]	198
[262]	199	;----------------------------------------------------------------------
	200	; Update drive counts (hard and floppy)
[294]	201	;----------------------------------------------------------------------
	202
[258]	203	%ifdef MODULE_SERIAL_FLOPPY
	204	;
	205	; These two instructions serve two purposes:
	206	; 1. If the drive is a floppy drive (CF set), then we effectively increment the counter.
[294]	207	; 2. If this is a hard disk, and there have been any floppy drives previously added, then the hard disk is
[258]	208	; effectively discarded. This is more of a safety check then code that should ever normally be hit (see below).
[294]	209	; Since the floppy DPT's come after the hard disk DPT's, without expensive (code size) code to relocate a DPT,
[258]	210	; this was necessary. Now, this situation shouldn't happen in normal operation, for a couple of reasons:
[294]	211	; A. xtidecfg always puts configured serial ports at the end of the IDEVARS list
[258]	212	; B. the auto serial code is always executed last
	213	; C. the serial server always returns floppy drives last
	214	;
	215	adc byte [RAMVARS.xlateVars+XLATEVARS.bFlopCreateCnt], 0
[294]	216	jnz .AllDone
[258]	217	%else
	218	;
	219	; Even without floppy support enabled, we shouldn't try to mount a floppy image as a hard disk, which
[294]	220	; could lead to unpredictable results since no MBR will be present, etc. The server doesn't know that
[258]	221	; floppies are supported, so it is important to still fail here if a floppy is seen during the drive scan.
	222	;
	223	jc .AllDone
	224	%endif
	225
[150]	226	inc BYTE [RAMVARS.bDrvCnt] ; Increment drive count to RAMVARS
[294]	227
	228	.AllDone:
[162]	229	clc
[3]	230	ret
[258]	231
[324]	232
[422]	233	;--------------------------------------------------------------------
[473]	234	; CreateDPT_StoreIdevarsOffsetAndBasePortFromCSBPtoDPTinDSDI
	235	; Parameters:
	236	; DX: Autodetected port (for devices that support autodetection)
	237	; DS:DI: Ptr to Disk Parameter Table
	238	; CS:BP: Ptr to IDEVARS for the controller
	239	; Returns:
	240	; Nothing
	241	; Corrupts registers:
	242	; AX
	243	;--------------------------------------------------------------------
	244	CreateDPT_StoreIdevarsOffsetAndBasePortFromCSBPtoDPTinDSDI:
	245	mov [di+DPT.bIdevarsOffset], bp ; IDEVARS must start in first 256 bytes of ROM
	246
	247	%ifdef MODULE_8BIT_IDE
	248	call DetectDrives_DoesIdevarsInCSBPbelongToXTCF
	249	jne SHORT .DeviceUsesPortSpecifiedInIDEVARS
	250	mov [di+DPT.wBasePort], dx
	251	ret
	252	.DeviceUsesPortSpecifiedInIDEVARS:
	253	%endif ; MODULE_8BIT_IDE
	254
	255	mov ax, [cs:bp+IDEVARS.wBasePort]
	256	mov [di+DPT.wBasePort], ax
	257	ret
	258
	259
	260	;--------------------------------------------------------------------
[422]	261	; GetUserDefinedCapacityToBXAXandFlagsToCXandModeToDXfromROMVARS
	262	; Parameters:
	263	; DS:DI: Ptr to Disk Parameter Table
	264	; Returns:
	265	; AX: User defined P-CHS Cylinders or LBA low word
	266	; BX: User defined P-CHS Heads and Sectors or LBA high word
	267	; DX: Translate mode or TRANSLATEMODE_AUTO
	268	; CX: FLG_DRVPARAMS_USERCHS if user defined CHS in BX:AX
	269	; FLG_DRVPARAMS_USERLBA if user defined LBA in BX:AX
	270	; Zero if user has not defined capacity
	271	; Corrupts registers:
	272	; Nothing
	273	;--------------------------------------------------------------------
	274	GetUserDefinedCapacityToBXAXandFlagsToCXandModeToDXfromROMVARS:
	275	call AccessDPT_GetPointerToDRVPARAMStoCSBX
	276
	277	; Get settings
	278	mov cx, [cs:bx+DRVPARAMS.wFlags]
	279	mov dx, cx
	280	and cx, BYTE FLG_DRVPARAMS_USERCHS \| FLG_DRVPARAMS_USERLBA
	281	and dx, BYTE MASK_DRVPARAMS_TRANSLATEMODE
	282	eSHR_IM dx, TRANSLATEMODE_FIELD_POSITION
	283
	284	; Get capacity
	285	mov ax, [cs:bx+DRVPARAMS.wCylinders] ; Or .dwMaximumLBA
	286	mov bx, [cs:bx+DRVPARAMS.wHeadsAndSectors] ; Or .dwMaximumLBA+2
	287	ret
	288
	289
[421]	290	%ifdef MODULE_EBIOS
[324]	291	;--------------------------------------------------------------------
[421]	292	; StoreLba48AddressingFromCLandTotalSectorCountFromBXDXAX
[324]	293	; Parameters:
	294	; BX:DX:AX: Total Sector Count
[421]	295	; CL: FLGL_DPT_LBA48 if LBA48 supported
[324]	296	; DS:DI: Ptr to Disk Parameter Table
	297	; Returns:
	298	; Nothing
	299	; Corrupts registers:
[421]	300	; CL
[324]	301	;--------------------------------------------------------------------
[421]	302	StoreLba48AddressingFromCLandTotalSectorCountFromBXDXAX:
	303	or cl, FLGL_DPT_LBA_AND_EBIOS_SUPPORTED
	304	and BYTE [di+DPT.bFlagsLow], ~FLGL_DPT_LBA48
	305	or [di+DPT.bFlagsLow], cl
[324]	306	mov [di+DPT.twLbaSectors], ax
	307	mov [di+DPT.twLbaSectors+2], dx
	308	mov [di+DPT.twLbaSectors+4], bx
	309	ret
[421]	310	%endif ; MODULE_EBIOS

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