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source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS/Src/Handlers/Int13h/EBIOS/AH48h_GetExtendedDriveParameters.asm@ 538

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Last change on this file since 538 was 535, checked in by aitotat@…, 11 years ago

Changes to XTIDE Universal BIOS:

AH=48h now returns Device Parameter Table Extension when RETURN_DPTE_ON_AH48H is defined.
Removed few unnecessary instructions from hardware interrupt handler.
P-Cylinders returned by AH=48h are no longer calculated from L-CHS capacity.

File size: 9.3 KB

Rev	Line
[165]	1	; Project name : XTIDE Universal BIOS
	2	; Description : Int 13h function AH=48h, Get Extended Drive Parameters.
	3
[376]	4	;
[526]	5	; XTIDE Universal BIOS and Associated Tools
	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.
[526]	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
	16	; GNU General Public License for more details.
[526]	17	; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
	18	;
[376]	19
[165]	20	; Section containing code
	21	SECTION .text
	22
	23	;--------------------------------------------------------------------
	24	; Int 13h function AH=48h, Get Extended Drive Parameters.
	25	;
[533]	26	; It is not completely clear what this function should return as total sector count in some cases.
	27	; What is certain is that:
	28	; A) Phoenix Enhanced Disk Drive Specification v3.0 says that P-CHS values
	29	; are never returned for drives with more than 15,482,880 sectors (163841563).
	30	; For those drives we can simply return total sector count from
	31	; ATA ID WORDs 60 and 61 (LBA28) or WORDs 100-103 (LBA48).
	32	; B) IBM PC DOS 7.1 fdisk32 displays warning message if P-CHS values multiplied
	33	; together are different than total sector count. Therefore for drives with less
	34	; than or equal 15,482,880 sectors we MUST NOT return total sector count from
	35	; ATA ID WORDs 60 and 61.
	36	;
	37	; Lets take an example. 6 GB Hitachi microdrive reports following values in ATA ID:
	38	; Sector count from WORDs 60 and 61 : 12,000,556
	39	; Cylinders : 11905
	40	; Heads : 16
	41	; Sectors per track : 63
	42	;
	43	; When multiplying CHS we get : 12,000,240
	44	; So the CHS size is a little bit less than LBA size. But we must use
	45	; the smaller value since CHS must equal total sector count!
	46	;
	47	; Now we get to the uncertain area where I could not find any information.
	48	; Award BIOS from 1997 Pentium motherboard returns following values:
	49	; AH=08h L-CHS: 745, 255, 63 (exactly the same as what we return)
	50	; => Total Sector Count: 74525563 = 11,968,425
	51	; AH=48h P-CHS: 11873, 16, 63
	52	; AH=48h Total Sector Count: 11873* 16*63 = 11,967,984
	53	;
	54	; Notice how AH=48h returns lesser total sector count than AH=8h! The only
	55	; way I could think of to get 11873 cylinders is to divide AH=08h sector
	56	; count with P-CHS heads and sectors: (74525563) / (16*63) = 11873
	57	;
	58	; I have no idea what is the reasoning behind it but at least there is one
	59	; BIOS that does just that.
	60	;
[535]	61	; I decided that we multiply P-CHS values and do not waste space like the
	62	; Award BIOS does.
[533]	63	;
	64	;
[165]	65	; AH48h_GetExtendedDriveParameters
	66	; Parameters:
	67	; SI: Same as in INTPACK
	68	; DL: Translated Drive number
	69	; DS:DI: Ptr to DPT (in RAMVARS segment)
	70	; SS:BP: Ptr to IDEPACK
	71	; Parameters on INTPACK:
	72	; DS:SI: Ptr to Extended Drive Information Table to fill
	73	; Returns with INTPACK:
	74	; AH: Int 13h return status
	75	; DS:SI: Ptr to Extended Drive Information Table
[294]	76	; CF: 0 if successful, 1 if error
[165]	77	;--------------------------------------------------------------------
	78	AH48h_HandlerForGetExtendedDriveParameters:
[535]	79	mov si, di
	80	push ds
	81	pop es ; ES = RAMVARS segment
	82	xor bx, bx
	83	dec bx ; Set to FFFFh to assume we do not return DPTE
[167]	84
[535]	85	; Create DPTE (hardware information for device drivers)
	86	%ifdef RETURN_DPTE_ON_AH48H
	87	call AH41h_GetSupportBitsToCX
	88	test cl, ENHANCED_DISK_DRIVE_SUPPORT
	89	jz SHORT .DoNotCreateDPTE
	90	call CreateDeviceParameterTableExtensionToESBXfromDPTinDSSI
	91	.DoNotCreateDPTE:
	92	%endif
	93
	94	; Point DS:DI to Extended Drive Information Table to fill
	95	mov di, [bp+IDEPACK.intpack+INTPACK.si]
[169]	96	mov ds, [bp+IDEPACK.intpack+INTPACK.ds]
[535]	97
	98	; Check and adjust Extended Drive Information Table size
	99	; to MINIMUM_EDRIVEINFO_SIZE or EDRIVEINFO_SIZE_WITH_DPTE
	100	mov ax, MINIMUM_EDRIVEINFO_SIZE
	101	mov cx, [di+EDRIVE_INFO.wSize]
	102	cmp cx, ax
[332]	103	jb Prepare_ReturnFromInt13hWithInvalidFunctionError
[535]	104	mov [di+EDRIVE_INFO.wSize], ax
	105	add al, EDRIVEINFO_SIZE_WITH_DPTE - MINIMUM_EDRIVEINFO_SIZE
	106	cmp cx, ax
	107	jb SHORT .SkipEddConfigurationParameters
	108	mov [di+EDRIVE_INFO.wSize], ax
[165]	109
[535]	110	; Store DPTE for standard controllers only,
	111	; FFFF:FFFF for non standard controllers
	112	%ifdef RETURN_DPTE_ON_AH48H
	113	mov [di+EDRIVE_INFO.fpDPTE], bx
	114	mov [di+EDRIVE_INFO.fpDPTE+2], es
	115	inc bx
	116	jnz SHORT .SkipEddConfigurationParameters ; Already stored
	117	dec bx
	118	mov [di+EDRIVE_INFO.fpDPTE+2], bx ; Segment = FFFFh
	119	%else
	120	mov [di+EDRIVE_INFO.fpDPTE], bx
	121	mov [di+EDRIVE_INFO.fpDPTE+2], bx
	122	%endif
[167]	123
[535]	124	; Fill Extended Drive Information Table in DS:DI from DPT in ES:SI
[167]	125	.SkipEddConfigurationParameters:
[535]	126	mov WORD [di+EDRIVE_INFO.wFlags], FLG_DMA_BOUNDARY_ERRORS_HANDLED_BY_BIOS
[165]	127
[324]	128	; Store total sector count
[535]	129	call Registers_ExchangeDSSIwithESDI
	130	call AccessDPT_GetLbaSectorCountToBXDXAX
	131	call Registers_ExchangeDSSIwithESDI
	132	mov [di+EDRIVE_INFO.qwTotalSectors], ax
	133	mov [di+EDRIVE_INFO.qwTotalSectors+2], dx
	134	mov [di+EDRIVE_INFO.qwTotalSectors+4], bx
[530]	135	xor cx, cx
[535]	136	mov [di+EDRIVE_INFO.qwTotalSectors+6], cx ; Always zero
	137	mov WORD [di+EDRIVE_INFO.wSectorSize], 512
[169]	138
[530]	139	; Store P-CHS. Based on phoenix specification this is returned only if
	140	; total sector count is 15,482,880 or less.
	141	sub ax, 4001h
	142	sbb dx, 0ECh
	143	sbb bx, cx ; Zero
	144	jnc SHORT .ReturnWithSuccess ; More than EC4000h
[535]	145	or WORD [di+EDRIVE_INFO.wFlags], FLG_CHS_INFORMATION_IS_VALID
[530]	146
[535]	147	eMOVZX dx, BYTE [es:si+DPT.bPchsHeads]
	148	mov [di+EDRIVE_INFO.dwHeads], dx
	149	mov [di+EDRIVE_INFO.dwHeads+2], cx
[421]	150
[535]	151	mov dl, [es:si+DPT.bPchsSectorsPerTrack]
	152	mov [di+EDRIVE_INFO.dwSectorsPerTrack], dx
	153	mov [di+EDRIVE_INFO.dwSectorsPerTrack+2], cx
[421]	154
[535]	155	mov dx, [es:si+DPT.wPchsCylinders]
	156	mov [di+EDRIVE_INFO.dwCylinders], dx
	157	mov [di+EDRIVE_INFO.dwCylinders+2], cx
[421]	158
[530]	159	.ReturnWithSuccess:
	160	xor ax, ax
[167]	161	.ReturnWithError:
[165]	162	jmp Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
[535]	163
	164
	165	%ifdef RETURN_DPTE_ON_AH48H
	166	;--------------------------------------------------------------------
	167	; CreateDeviceParameterTableExtensionToESBXfromDPTinDSSI
	168	; Parameters:
	169	; DS:SI: Ptr to DPT (in RAMVARS segment)
	170	; ES: RAMVARS segment
	171	; Returns:
	172	; ES:BX: Ptr to Device Parameter Table Extension (DPTE)
	173	; Corrupts registers:
	174	; AX, CX, DX, DI
	175	;--------------------------------------------------------------------
	176	CreateDeviceParameterTableExtensionToESBXfromDPTinDSSI:
	177	; Point ES:DI to DPTE buffer (valid until next AH=48h call)
	178	mov di, [cs:ROMVARS.bStealSize]
	179	eSHL_IM di, 10 ; DI = RAMVARS size in bytes
	180	sub di, BYTE DPTE_size ; DI = Offset to DPTE
	181	xor dx, dx ; Clear for checksum
	182
	183	; Set 32-bit flag for 32-bit controllers
	184	mov cx, FLG_LBA_TRANSLATION_ENABLED ; DPTE.wFlags
	185	cmp BYTE [si+DPT_ATA.bDevice], DEVICE_32BIT_ATA
	186	eCMOVE cl, FLG_LBA_TRANSLATION_ENABLED \| FLG_32BIT_XFER_MODE
	187
	188	; DPTE.wBasePort
	189	mov ax, [si+DPT.wBasePort]
	190	call StoswThenAddALandAHtoDL ; Bytes 0 and 1
	191
	192	; DPTE.wControlBlockPort
	193	eMOVZX bx, BYTE [si+DPT.bIdevarsOffset]
	194	mov ax, [cs:bx+IDEVARS.wControlBlockPort]
	195	call StoswThenAddALandAHtoDL ; Bytes 2 and 3
	196
	197	; DPTE.bDrvnhead and DPTE.bBiosVendor
	198	xchg di, si
	199	call AccessDPT_GetDriveSelectByteForEbiosToAL
	200	xchg si, di
	201	call StoswThenAddALandAHtoDL ; Bytes 4 and 5
	202
	203	; DPTE.bIRQ and DPTE.bBlockSize
	204	mov al, [cs:bx+IDEVARS.bIRQ] ; No way to define that we might not use IRQ
	205	mov ah, [si+DPT_ATA.bBlockSize]
	206	cmp ah, 1
	207	jbe SHORT .DoNotSetBlockModeFlag
	208	or cl, FLG_BLOCK_MODE_ENABLED
	209	.DoNotSetBlockModeFlag:
	210	call StoswThenAddALandAHtoDL ; Bytes 6 and 7
	211
	212	; DPTE.bDmaChannelAndType and DPTE.bPioMode
	213	xor ax, ax
	214	%ifdef MODULE_ADVANCED_ATA
	215	or ah, [si+DPT_ADVANCED_ATA.bPioMode]
	216	jz SHORT .NoDotSetFastPioFlag
	217	cmp WORD [si+DPT_ADVANCED_ATA.wControllerID], BYTE 0
	218	je SHORT .NoDotSetFastPioFlag
	219	inc cx ; FLG_FAST_PIO_ENABLED
	220	.NoDotSetFastPioFlag:
	221	%endif
	222	call StoswThenAddALandAHtoDL ; Bytes 8 and 9
	223
	224	; Set CHS translation flags and store DPTE.wFlags
	225	mov al, [si+DPT.bFlagsLow]
	226	and al, MASKL_DPT_TRANSLATEMODE
	227	jz SHORT .NoChsTranslationOrBitShiftTranslationSet
	228	or cl, FLG_CHS_TRANSLATION_ENABLED
	229	test al, FLGL_DPT_ASSISTED_LBA
	230	jz SHORT .NoChsTranslationOrBitShiftTranslationSet
	231	or cx, LBA_ASSISTED_TRANSLATION << TRANSLATION_TYPE_FIELD_POSITION
	232	.NoChsTranslationOrBitShiftTranslationSet:
	233	xchg ax, cx
	234	call StoswThenAddALandAHtoDL ; Bytes 10 and 11
	235
	236	; DPTE.wReserved (must be zero)
	237	xor ax, ax
	238	call StoswThenAddALandAHtoDL ; Bytes 12 and 13
	239
	240	; DPTE.bRevision and DPTE.bChecksum
	241	mov ax, DPTE_REVISION \| (DPTE_REVISION<<8)
	242	add ah, dl
	243	neg ah
	244	stosw
	245	lea bx, [di-DPTE_size]
	246	ret
	247
	248
	249	;--------------------------------------------------------------------
	250	; StoswThenAddALandAHtoDL
	251	; Parameters:
	252	; AX: WORD to store
	253	; ES:DI: Ptr to where to store AX
	254	; DL: Checksum byte
	255	; Returns:
	256	; DL: Checksum byte
	257	; DI: Incremented by 2
	258	; Corrupts registers:
	259	; Nothing
	260	;--------------------------------------------------------------------
	261	StoswThenAddALandAHtoDL:
	262	stosw
	263	add dl, al
	264	add dl, ah
	265	ret
	266
	267	%endif ; RETURN_DPTE_ON_AH48H

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