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partmain.asm

Last change on this file was 170, checked in by Ben Rietbroek, 8 years ago

Updated debugging state [v1.1.1-testing]

CAUTION:
This is a testbuild !
AirBoot uses the BIOS to access disks and a small coding error can trash
partition tables or other vital disk structures. You are advised to make
backups of TRACK0 and EBRs before using this testbuild. More info at:
https://rousseaux.github.io/netlabs.air-boot/pdf/AirBoot-v1.1.0-manual.pdf

File size: 79.8 KB

Rev	Line
[29]	1	; AiR-BOOT (c) Copyright 1998-2008 M. Kiewitz
	2	;
	3	; This file is part of AiR-BOOT
	4	;
	5	; AiR-BOOT is free software: you can redistribute it and/or modify it under
	6	; the terms of the GNU General Public License as published by the Free
	7	; Software Foundation, either version 3 of the License, or (at your option)
	8	; any later version.
	9	;
	10	; AiR-BOOT is distributed in the hope that it will be useful, but WITHOUT ANY
	11	; WARRANTY: without even the implied warranty of MERCHANTABILITY or FITNESS
	12	; FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
	13	; details.
	14	;
	15	; You should have received a copy of the GNU General Public License along with
	16	; AiR-BOOT. If not, see <http://www.gnu.org/licenses/>.
	17	;
[8]	18	;---------------------------------------------------------------------------
	19	; AiR-BOOT / PARTiTiON REGULAR ROUTINES
	20	;---------------------------------------------------------------------------
	21
[51]	22	IFDEF MODULE_NAMES
[30]	23	DB 'PARTMAIN',0
	24	ENDIF
	25
[8]	26	PART_FixUpDefaultPartitionValues Proc Near Uses dx si di
[51]	27	; Fix-Up Default and Last Partition - If lost, search for Bootable
	28	xor bl, bl
	29	mov dl, CFG_PartDefault
	30	call PART_FixUpSelectionNumber
	31	mov CFG_PartDefault, dl
	32	mov dl, CFG_PartLast
	33	call PART_FixUpSelectionNumber
	34	mov CFG_PartLast, dl
	35	mov dl, CFG_PartAutomatic
	36	call PART_FixUpSelectionNumber
	37	mov CFG_PartAutomatic, dl
[8]	38	ret
	39	PART_FixUpDefaultPartitionValues EndP
	40
	41	; Our resync process for partition number is as specified:
	42	;==========================================================
	43	; - If 0FFh -> Partition Disabled, so don't do anything to it...
	44	; - Try to use GetXref to get the new partition no via X-Ref Table
	45	; - If failed, increase partition no, till overflow or hit on specific
	46	; characteristic
	47	; On overflow -> Resume search from partition no 0
	48	;
	49	; Characteristic is a partition id. If this id is 0, then a bootable partition
	50	; is searched for.
	51
	52	; Fixes a partition number, adjusting it to the new IPT after redetect
	53	; In: DL - Number of partition
	54	; BL - Requested Partition ID
	55	; Out: DL - New number of partition (guessed normally ;)
[29]	56	PART_FixUpSelectionNumber Proc Near Uses ax cx
[51]	57	cmp dl, 080h
	58	je PFUPN_SelectionDisabled
	59	ja PFUPN_SpecialSelection
	60	call PARTSCAN_GetXref ; DL - PartitionNo prev IPT
	61	cmp dh, 0FFh ; DH -> Partition No in new IPT
	62	je PFUPN_SelectionGone
	63	mov dl, dh
	64	PFUPN_SelectionDisabled:
	65	ret
[8]	66
[51]	67	PFUPN_SpecialSelection:
	68	cmp dl, 0FEh ; Resume-BIOS?
	69	ja PFUPN_SpecialSelectionFloppy
	70	cmp byte ptr [CFG_ResumeBIOSbootSeq], 0
	71	je PFUPN_SelectionGone
	72	jmp PFUPN_Found
	73	PFUPN_SpecialSelectionFloppy:
	74	cmp byte ptr [CFG_IncludeFloppy], 0
	75	je PFUPN_SelectionGone
	76	jmp PFUPN_Found
[29]	77
[51]	78	; Partition is not referenced in New-IPT or Resume-BIOS/Floppy selected, but
	79	; actual media is disabled...so dig for requested partition
	80	PFUPN_SelectionGone:
	81	mov cl, CFG_Partitions
	82	or cl, cl
	83	jz PFUPN_NothingFound ; No partitions available -> so fail
	84	or bl, bl
	85	jz PFUPN_BootableSearchLoop
	86	; Search for Partition ID "BL"
	87	PFUPN_PartIDsearchLoop:
	88	call PART_GetPartitionPointer ; Gets SI for partition DL
	89	cmp bptr ds:[si+LocIPT_SystemID], bl
	90	je PFUPN_Found
	91	dec cl
	92	jz PFUPN_NothingFound
	93	inc dl ; Increase
	94	cmp CFG_Partitions, dl
	95	ja PFUPN_PartIDsearchLoop
	96	xor dl, dl
	97	jmp PFUPN_PartIDsearchLoop
[8]	98
[51]	99	; Search for Partition ID "BL"
	100	PFUPN_BootableSearchLoop:
	101	call PART_GetPartitionPointer ; Gets SI for partition DL
	102	mov al, ds:[si+LocIPT_Flags]
	103	and al, Flags_Bootable
	104	jnz PFUPN_Found
	105	dec cl
	106	jz PFUPN_NothingFound
[8]	107
[51]	108	inc dl ; Increase
	109	cmp CFG_Partitions, dl
	110	ja PFUPN_PartIDsearchLoop
	111	xor dl, dl
	112	jmp PFUPN_PartIDsearchLoop
	113
	114	PFUPN_NothingFound:
	115	mov dl, 080h ; Now being Disabled
	116	PFUPN_Found:
	117	ret
[29]	118	PART_FixUpSelectionNumber EndP
[8]	119
	120	; ============================================================================
[29]	121	; In: DS:SI - IPT-Entry of partition
	122	; DS:PartitionSector - Actual Boot-Record of partition
[52]	123	; Out: none (BootRecordCRC updated)
	124	; CHECKME: Verify the change (BX points to sector to CRC) is working OK
[8]	125	PART_UpdateBootRecordCRC Proc Near Uses bx
[52]	126	push si
	127	;~ mov si, offset PartitionSector
	128	mov si, bx
[51]	129	mov bx, 4B4Dh ; Magic: 'MK'
	130	call MBR_GetCheckOfSector
[52]	131	pop si
[51]	132	mov [si+LocIPT_BootRecordCRC], bx
	133	ret
[8]	134	PART_UpdateBootRecordCRC EndP
	135
[51]	136
	137
	138	; Rousseau:
	139	; ---------
	140	; Bug:
	141	; When ResumeBIOSbootSeq is zero, BX still gets decremented and shifted left.
	142	; Then when used as an index into ContinueBIOSbootTable to get the address
	143	; of the device-name, the index is two bytes too low, and SI get's loaded
	144	; with whatever is before the ContinueBIOSbootTable.
	145	; Then when SI is used to copy a null-terminated string, it depends on the
	146	; bogus location SI points to where a null-byte will appear.
	147	; Since I placed some text before the ContinueBIOSbootTable, the bogus pointer
	148	; SI obtained pointed to an area where there was no null-byte in sight for
	149	; more than 11 bytes, causing SI to overwrite the CD-ROM IPT entry with
	150	; garbage. It took me a while to tackle this one because I was baffled why
	151	; moving text around in STD_TEXT.ASM, where ContinueBIOSbootTable resides,
	152	; mattered while the offset of ContinueBIOSbootTable did not change.
	153	; This bug is also present in v1.06 but never surfaced because STD_TEXT.ASM
	154	; is kinda static and luck has it that the word preceding ContinueBIOSbootTable
	155	; presumably pointed to an area where a null byte was near.
	156	;
[52]	157	; BOOKMARK: The nasty pointer bug
[51]	158
	159
[29]	160	; Copies the device-name to the Resume-BIOS IPT entry
	161	PART_UpdateResumeBIOSName Proc Near Uses ax bx cx si di
[30]	162
[51]	163	; Get BIOS resume indicator.
	164	;movzx bx, CFG_ResumeBIOSbootSeq
	165	mov bl,CFG_ResumeBIOSbootSeq
	166	mov bh,0
	167
	168	; Clear name of IPT-entry.
	169	mov di, offset BIOScontIPTentry+LocIPT_Name
	170	push di
	171	mov cx, 11
	172	mov al, ' '
	173	rep stosb
	174	pop di
	175
	176	; If no resume then exit.
	177	test bx,bx
	178	jz PURBN_NoResumeBootSeq
	179
	180	; Convert to index in name-table.
	181	dec bx
	182	shl bx, 1
	183
	184	; Put the pointer to the name in SI.
	185	mov si, word ptr [ContinueBIOSbootTable+bx]
	186
	187	; Copy the name to the IPT-entry.
	188	PURBN_BootDeviceCopyLoop:
	189	lodsb
	190	or al, al
	191	jz PURBN_NoResumeBootSeq
	192	stosb
	193	jmp PURBN_BootDeviceCopyLoop
	194
	195	; We're done.
	196	PURBN_NoResumeBootSeq:
	197
	198	ret
[29]	199	PART_UpdateResumeBIOSName EndP
	200
[51]	201
	202
[8]	203	; ============================================================================
	204	; Partition-Pointer Functions
	205	; ============================================================================
	206
	207	; Builds Pointer-Table straight (without filtering, w/o Floppy/CD-ROM/Kernels)
	208	PART_CalculateStraightPartPointers Proc Near
[51]	209	mov ax, offset PartitionTable
	210	mov bx, offset PartitionPointers
	211	mov cx, LocIPT_MaxPartitions
	212
	213	PCSPP_Loop:
	214	mov ds:[bx], ax ; Move address IPT entry to PPT
	215	add bx, 2 ; Advance pointer to PPT entry
	216	add ax, LocIPT_LenOfIPT ; Advance pointer to IPT entry
	217	dec cx ; Decrement counter
	218	jnz PCSPP_Loop ; Next iteration
	219
	220	mov al, ds:[CFG_Partitions] ; Get number of partitions
	221	mov ds:[PartitionPointerCount], al ; Update number for PPT
	222	ret
[8]	223	PART_CalculateStraightPartPointers EndP
	224
	225	; This here does PartitionPointers in order for displaying in BootMenu
	226	; [this means filtering and including Floppy/CD-ROM/Kernels, if wanted]
	227	PART_CalculateMenuPartPointers Proc Near Uses si
	228
[51]	229	;!
	230	;! DEBUG_PROBE
	231	;!
	232	IFDEF AUX_DEBUGx
	233	push 1241h
	234	call DEBUG_Probe
	235	ENDIF
[8]	236
[51]	237	mov si, offset PartitionTable
	238	mov bx, offset PartitionPointers
	239	test byte ptr [CFG_IncludeFloppy], 1
	240	jz PCMPP_NoFloppyInclude
	241	mov ax, offset FloppyIPTentry
	242	mov ds:[bx], ax
	243	add bx, 2
	244	PCMPP_NoFloppyInclude:
	245
	246	test byte ptr [CFG_ResumeBIOSbootSeq], 0FFh
	247	jz PCMPP_NoResumeBootSeqInclude
	248	mov ax, offset BIOScontIPTentry
	249	mov ds:[bx], ax
	250	add bx, 2
	251	PCMPP_NoResumeBootSeqInclude:
	252
	253	;movzx cx, CFG_Partitions ; LocIPT_MaxPartitions
	254	mov cl,CFG_Partitions ; LocIPT_MaxPartitions
	255	mov ch,0
[30]	256
[51]	257	or cx, cx
	258	jz PCMPP_NoPartitions
	259	PCMPP_Loop:
	260	mov al, ds:[si+LocIPT_Flags]
	261	and al, Flags_Bootable
	262	jz PCMPP_IsNotBootable
	263	mov ds:[bx], si
	264	add bx, 2
	265	PCMPP_IsNotBootable:
	266	add si, LocIPT_LenOfIPT
	267	dec cx
	268	jnz PCMPP_Loop
	269	PCMPP_NoPartitions:
	270	sub bx, offset PartitionPointers
	271	shr bx, 1
	272	mov ds:[PartitionPointerCount], bl
	273	ret
[8]	274	PART_CalculateMenuPartPointers EndP
	275
	276	; Gets a pointer to the given partition
	277	; In: DL - Number of partition
[29]	278	; Out: SI - Pointer to it
[8]	279	PART_GetPartitionPointer Proc Near Uses bx
[51]	280	cmp dl, 0FEh
	281	je PGPP_IsBIOSbootSeq ; FEh -> Resume BIOS boot Sequence
	282	ja PGPP_IsFloppy ; FFh -> Floppy
	283	;movzx bx, dl
	284	mov bl,dl
	285	mov bh,0
[30]	286
[51]	287	shl bx, 1
	288	mov si, word ptr [PartitionPointers+bx]
	289	ret
	290
	291	PGPP_IsBIOSbootSeq:
	292	;!
	293	;! DEBUG_PROBE
	294	;!
	295	IFDEF AUX_DEBUGx
	296	push 1242h
	297	call DEBUG_Probe
	298	ENDIF
	299
	300	mov si, offset BIOScontIPTentry
	301	ret
	302
	303	PGPP_IsFloppy:
	304	mov si, offset FloppyIPTentry ; PartitionTable-LocIPT_LenOfIPT
	305	ret
[8]	306	PART_GetPartitionPointer EndP
	307
	308	; Gets the number of a partition pointer
	309	; In: SI - Pointer to Partition
	310	; Out: DL - Number of partition
	311	PART_GetPartitionNumber Proc Near Uses bx
[51]	312	mov dl, ds:[PartitionPointerCount]
	313	mov bx, offset PartitionPointers
	314	PGPN_SearchLoop:
	315	cmp word ptr ds:[bx], si
	316	je PGPN_Found
	317	add bx, 2
	318	dec dl
	319	jnz PGPN_SearchLoop
	320	mov dl, 0FFh
	321	ret
	322
	323	PGPN_Found:
	324	sub dl, ds:[PartitionPointerCount]
	325	dec dl
	326	not dl
	327	ret
[8]	328	PART_GetPartitionNumber EndP
	329
[51]	330
	331	;
[8]	332	; Following functions are only usable, when Partition-Pointer-View is filtered
[51]	333	;
	334
[8]	335	; They will convert from and to unfiltered view (used in Boot-Menu)
	336	; In: DL - Number of partition in filtered view
	337	; Out: DL - Number of partition in straight view
[51]	338	;
	339	; This gets the address of the IPT-entry from the Partition Pointer Table and
	340	; converts that to an index into the IPT; the straight view.
	341	;
[40]	342	PART_ConvertToStraight Proc Near
[51]	343	;movzx bx, dl
	344	mov bl,dl ; Partition number to BX
	345	mov bh,0
[30]	346
[51]	347	shl bx, 1 ; Convert to word index
	348	mov ax, word ptr cs:[PartitionPointers+bx] ; Get the partition pointer
	349	cmp ax, offset FloppyIPTentry ; Check for Floppy
	350	jb PCTS_IsBIOSbootSeq ; Nope, is BIOS-bootseq
	351	je PCTS_IsFloppy ; Is Floppy
	352
	353	;
	354	; Is partition, AX contains pointer to IPT entry
	355	;
	356	sub ax, offset PartitionTable ; Make relative
	357	mov bl, LocIPT_LenOfIPT ; Length of IPT entry
	358	div bl ; Divide with IPTlength
	359	mov dl, al ; Index in IPT
	360	ret
	361
	362	PCTS_IsBIOSbootSeq:
	363	mov dl, 0FEh
	364	ret
	365	PCTS_IsFloppy:
	366	mov dl, 0FFh
	367	ret
[8]	368	PART_ConvertToStraight EndP
	369
[51]	370
	371
[8]	372	; In: DL - Number of partition in straight view
	373	; Out: DL - Number of partition in filtered view
[51]	374	;
	375	; This searches for the absolute offset of an IPT-entry in the
	376	; PartitionPointers table.
	377	; This table holds the offsets of IPT partition entries that are in the Menu ?
	378	; If the offset/entry is found it's index, the filtered number, is returned.
	379	;
[8]	380	PART_ConvertFromStraight Proc Near Uses es di
[51]	381	;!
	382	;! DEBUG_PROBE
	383	;!
	384	IFDEF AUX_DEBUGx
	385	push 1243h
	386	call DEBUG_Probe
	387	ENDIF
[30]	388
[51]	389	cmp dl, 0FEh
	390	jb PCFS_IsPartition
	391	mov ax, offset BIOScontIPTentry
	392	je PCFS_DoSearch
	393	mov ax, offset FloppyIPTentry
	394	jmp PCFS_DoSearch
	395
	396
	397	PCFS_IsPartition:
	398	; First we get Partition-Offset in AX
	399	;movzx ax, dl
	400	mov al,dl ; Index in IPT to AX
	401	mov ah,0
	402	mov bl, LocIPT_LenOfIPT ; Length of an IPT entry
	403	mul bl ; Mul to get relative offset
	404	add ax, offset PartitionTable ; Add to get absolute offset
	405
	406	;
	407	; AX now points to the IPT entry of the partition.
	408	; This address is searched for in the Partition Pointer Table.
	409	;
	410
	411	PCFS_DoSearch:
	412	; Now search for this offset in our filtered Partition-Pointer-Table
	413	push cs
	414	pop es
	415	mov di, offset PartitionPointers ; Point to table
	416	mov cx, LocIPT_MaxPartitions ; Max number of entries to search
	417	xor dl, dl ; Reply on Not-Found = Partition==0
	418	repne scasw ; Compare-Loop
	419	jne PCFS_NotFound
	420	sub di, 2 ; One Back, so point to compared value
	421	mov dx, di ; Offset in DX
	422	sub dx, offset PartitionPointers ; Make relative
	423	shr dx, 1 ; Convert to Index
	424	; Adjust for IncludeFloppy/etc. is automatically done, due Pointer-LookUp
	425	PCFS_NotFound:
	426	ret
[8]	427	PART_ConvertFromStraight EndP
	428
[51]	429
	430
[8]	431	; In: AX - Pointer to IPT Entry
	432	; Out: SI - Pointer to corresponding Size-Element
	433	; Destroyed: AX
	434	PART_GetSizeElementPointer Proc Near Uses bx
[51]	435	mov si, offset PartitionSizeTable
	436	sub ax, offset PartitionTable
	437	mov bl, LocIPT_LenOfIPT
	438	div bl ; Divide with IPTlength
	439	;movzx bx, al
	440	mov bl,al
	441	mov bh,0
[30]	442
[51]	443	shl ax, 1
	444	shl bx, 2
	445	add ax, bx ; My way of multiplying with 6
	446	add si, ax ; SI - Partition Size-Element
	447	ret
[8]	448	PART_GetSizeElementPointer EndP
	449
	450	; In: BX:AX - Sector Size (1=512 Bytes, 2=1024 Bytes, etc.)
	451	; ES:DI - Pointer to Size-Element (6 bytes)
	452	; Out: None, Size-Element filled out
	453	; Destroyed: AX, BX, DI
	454	PART_FillOutSizeElement Proc Near Uses cx dx
[51]	455	add di, 3 ; ES:DI - Last Digit of Size Digits
	456	shr bx, 1
	457	rcr ax, 1 ; /2 -> Sector Size is now KByte Size
	458	xor cl, cl ; 0 - KByte, 1 - MByte, 2 - GByte
	459	PFOSE_MakeSmallerLoop:
	460	or bx, bx
	461	jnz PFOSE_MakeSmaller
	462	cmp ax, 9999
	463	jbe PFOSE_IsSmallEnough
	464	PFOSE_MakeSmaller:
	465	mov dx, bx
	466	and dx, 1023 ; My crazy way of dividing a 32-bit
	467	shr ax, 10 ; value through 1024 using 16-bit
	468	shr bx, 10 ; instructions...
	469	shl dx, 6
	470	or ax, dx
	471	inc cl ; Value got smaller...
	472	jmp PFOSE_MakeSmallerLoop
[8]	473
[51]	474	PFOSE_IsSmallEnough:
	475	; First write the type of this Size-Element (KB/MB/GB)
	476	mov bx, 'BK'
	477	cmp cl, 1
	478	jb PFOSE_WriteType
	479	je PFOSE_IsMBtype
	480	mov bx, 'BG'
	481	jmp PFOSE_WriteType
	482	PFOSE_IsMBtype:
	483	mov bx, 'BM'
	484	PFOSE_WriteType:
	485	mov word ptr es:[di+1], bx
	486	mov bx, 10 ; Digits are 10-Based
	487	xor dx, dx
	488	PFOSE_DigitLoop:
	489	xor dx, dx
	490	div bx ; AX - Digit, DX - Remainder
	491	add dl, '0' ; Convert digit to ASCII digit
	492	mov es:[di], dl
	493	or ax, ax
	494	jz PFOSE_EndOfDigitLoop
	495	dec di ; Go to previous char
	496	jmp PFOSE_DigitLoop
[30]	497
[51]	498	PFOSE_EndOfDigitLoop:
	499	ret
[8]	500	PART_FillOutSizeElement EndP
	501
[30]	502
	503
	504
[31]	505
	506
	507
	508
	509
	510
	511
	512	; This routine is called to hide a partition
	513	; In: DL - Partition to hide
	514	; Destroyed: None
	515	PART_HidePartition Proc Near Uses ax bx cx dx si di
[111]	516
	517	IFDEF AUX_DEBUG
	518	IF 0
[123]	519	DBG_TEXT_OUT_AUX 'PART_HidePartition:'
	520	PUSHRF
[111]	521	;~ call DEBUG_DumpRegisters
	522	;~ call AuxIO_DumpParagraph
	523	;~ call AuxIO_TeletypeNL
[123]	524	POPRF
[111]	525	ENDIF
	526	ENDIF
	527
[51]	528	call PART_GetPartitionPointer ; Pointer to partition (DL) -> SI
[31]	529
[51]	530	; First load the partition table of that partition...
	531	mov ax, wptr [si+LocIPT_AbsolutePartTable+0]
	532	mov bx, wptr [si+LocIPT_AbsolutePartTable+2]
	533	mov cx, wptr [si+LocIPT_LocationPartTable+1]
	534	mov dh, bptr [si+LocIPT_LocationPartTable+0]
	535	mov dl, [si+LocIPT_Drive]
	536	call DriveIO_LoadPartition
	537	; Partition-Table now LOADED
	538	mov di, offset PartitionSector+446 ; ES:DI - 1st partitionentry...
[31]	539
[51]	540	; Put our partition's location into registers...
	541	mov ax, wptr [si+LocIPT_AbsoluteBegin+0]
	542	mov bx, wptr [si+LocIPT_AbsoluteBegin+2]
	543	sub ax, wptr [si+LocIPT_AbsolutePartTable+0]
	544	sbb bx, wptr [si+LocIPT_AbsolutePartTable+2]
	545	; BX:AX - absolute position of partition relative to partition table
	546	; ...and search for it...
	547	PHP_SearchLoop:
	548	cmp ax, wptr es:[di+LocBRPT_RelativeBegin]
	549	jne PHP_SearchMismatch
	550	cmp bx, wptr es:[di+LocBRPT_RelativeBegin+2]
	551	jne PHP_SearchMismatch
	552	jmp PHP_SearchMatch
	553	PHP_SearchMismatch:
	554	add di, LocBRPT_LenOfEntry ; 16 Bytes per partition entry
	555	cmp di, 500+offset PartitionSector
	556	jb PHP_SearchLoop
	557	jmp MBR_HaltSystem ; not found, something is wrong here
[31]	558
[51]	559	; Found entry...
	560	PHP_SearchMatch:
	561	mov al, bptr es:[di+LocBRPT_SystemID] ; Partition-ID into AL
	562	call PART_SearchFileSysHiddenID ; Put on =STEALTH=
	563	mov bptr es:[di+LocBRPT_SystemID], al
[76]	564	call DriveIO_SavePartition ; Saves Partition-Table
[51]	565	ret
[31]	566	PART_HidePartition EndP
	567
[51]	568
	569
	570
	571
[31]	572	; This here is for marking the first "good" non-hidden partition as being
	573	; active. It requires the partition table at EXECBASE.
	574	; Some BIOSes have problems with no primary marked active. Actually this is
	575	; a buggy implementation, because the MBR-code should normally check,
	576	; not the BIOS. This one could cause havoc to some systems, but I can't
	577	; do anything else.
	578	PART_MarkFirstGoodPrimary Proc Near Uses ax si di
[111]	579
	580	IFDEF AUX_DEBUG
	581	IF 0
[123]	582	DBG_TEXT_OUT_AUX 'PART_MarkFirstGoodPrimary:'
	583	PUSHRF
[111]	584	;~ call DEBUG_DumpRegisters
	585	;~ call AuxIO_DumpParagraph
	586	;~ call AuxIO_TeletypeNL
[123]	587	POPRF
[111]	588	ENDIF
	589	ENDIF
	590
[51]	591	mov di, offset PartitionSector+446 ; DS:SI - 1st partitionentry
	592	; First action to do: Remove the active flag from every partition
	593	push di
	594	mov cl, 4
	595	PMPP_RemoveActiveFlagLoop:
	596	and bptr es:[di+LocBRPT_Flags], 7Fh
	597	add di, LocBRPT_LenOfEntry
	598	dec cl
	599	jnz PMPP_RemoveActiveFlagLoop
	600	pop di
	601	; First Search, will hit on any PartitionID that is:
	602	; a) not 0
	603	; b) not hidden
	604	; c) not extended partition (05h or 0Fh)
	605	PMPP_Search1Loop:
	606	mov al, bptr es:[di+LocBRPT_SystemID]
	607	or al, al
	608	jz PMPP_Search1NoHit
	609	cmp al, 05h
	610	je PMPP_Search1NoHit
	611	cmp al, 0Fh
	612	je PMPP_Search1NoHit
	613	mov bl, al ; BL == AL == PartitionID
	614	push si
	615	call PART_SearchFileSysName
	616	pop si ; AL == UnhiddenPartitionID
	617	cmp al, bl ; if ID is unhidden...
	618	je PMPP_SearchHit
	619	PMPP_Search1NoHit:
	620	add di, LocBRPT_LenOfEntry ; 16 Bytes per Partition-Entry
	621	cmp di, 500+offset PartitionSector
	622	jb PMPP_Search1Loop
[31]	623
[51]	624	mov di, offset PartitionSector+446 ; DS:SI - 1st Partition-Entry
	625	; Second Search, hit on anything that is not an extended partition
	626	; (05 or 0Fh)
	627	PMPP_Search2Loop:
	628	mov al, bptr es:[di+LocBRPT_SystemID]
	629	or al, al
	630	jz PMPP_Search2NoHit
	631	cmp al, 05h
	632	je PMPP_Search2NoHit
	633	cmp al, 0Fh
	634	jne PMPP_SearchHit
	635	PMPP_Search2NoHit:
	636	add di, LocBRPT_LenOfEntry ; 16 Bytes per Partition-Entry
	637	cmp di, 500+offset PartitionSector
	638	jb PMPP_Search2Loop
	639	jmp PMPP_SearchFailed
[31]	640
[51]	641	PMPP_SearchHit:
	642	or bptr es:[di], 80h ; SET ACTIVE PARTITION
	643	PMPP_SearchFailed:
	644	ret
[31]	645	PART_MarkFirstGoodPrimary EndP
	646
	647	; Searches the Name and Flags to a FileSysID (PartitionID)
	648	; In: AL - FileSysID
	649	; Out: AL - Unhidden File-System-ID, AH - Flags for this File-System
	650	; SI - Pointer to Name (8char)
	651	; Destroyed: none
	652	PART_SearchFileSysName Proc Near Uses bx dx
[51]	653	;movzx bx, al
	654	mov bl,al
	655	mov bh,0
[31]	656
[51]	657	mov si, offset FileSysIDs
	658	PSFSN_SearchLoop:
	659	lodsw ; AL - NormalID, AH-HiddenID
	660	mov dl, ds:[si] ; DL - File-System-Flags
	661	inc si
	662	cmp al, bl ; Check, if Unhidden-ID matches...
	663	je PSFSN_Match
	664	cmp ah, bl ; Check, if Hidden-ID matches...
	665	je PSFSN_Match
	666	mov al, bl ; So Unhidden-ID will be Original-ID
	667	cmp ah, 0 ; Unknown (last ID in table)
	668	je PSFSN_Match
	669	inc bh
	670	jmp PSFSN_SearchLoop
[31]	671
[51]	672	PSFSN_Match:
	673	; AL is already Unhidden-ID
	674	mov ah, dl
	675	; AH is now the FileSystem-Flag
	676	;movzx bx, bh
	677	mov bl,bh
	678	mov bh,0
[31]	679
[51]	680	shl bx, 3 ; Offsets * 8
	681	mov si, offset FileSysNames
	682	add si, bx
	683	ret
[31]	684	PART_SearchFileSysName EndP
	685
	686	; Searches the Hidden ID corresponding to a FileSysID (PartitionID)
	687	; In: AL - FileSysID
	688	; Out: AL - Hidden File-System-ID
	689	PART_SearchFileSysHiddenID Proc Near Uses bx
[51]	690	;movzx bx, al
	691	mov bl,al
	692	mov bh,0
[31]	693
[51]	694	mov si, offset FileSysIDs
	695	PSFSHI_SearchLoop:
	696	lodsw ; AL - NormalID, AH-HiddenID
	697	inc si
	698	cmp al, bl ; Check, if Unhidden-ID matches...
	699	je PSFSHI_Match
	700	cmp ah, bl ; Check, if Hidden-ID matches...
	701	je PSFSHI_Match
	702	mov ah, bl ; So Unhidden-ID will get replied...
	703	cmp ah, 0 ; Unknown (last ID in table)
	704	je PSFSHI_Match
	705	inc bh
	706	jmp PSFSHI_SearchLoop
[31]	707
[51]	708	PSFSHI_Match:
	709	mov al, ah ; AL = Hidden ID
	710	ret
[31]	711	PART_SearchFileSysHiddenID EndP
	712
	713	; In: DS:SI - Partition-Name, CX - Maximum/Total Length
	714	; Out: Carry-Flag set, if valid Partition-Name
	715	; Destroyed: None
	716	PART_CheckForValidPartName Proc Near Uses ax cx dx si
[51]	717	; Our logic is as follows:
	718	; If all chars are U -> Invalid (due reformated signature)
	719	; If anything below 32, but 0 -> Invalid (due invalid chars)
	720	; If anything above 165 -> Invalid (due invalid chars)
	721	; If anything between 123-128 -> Invalid (due invalid chars)
	722	; DX - holds count of 'U's
	723	push cx
	724	or cx, cx
	725	jz PCFVPN_InvalidName
	726	xor dx, dx
	727	PCFVPN_CheckLoop:
	728	lodsb
	729	cmp al, 0
	730	je PCFVPN_ValidChar
	731	cmp al, 32
	732	jb PCFVPN_InvalidName
	733	cmp al, 165
	734	ja PCFVPN_InvalidName
	735	cmp al, 123
	736	jb PCFVPN_ValidChar
	737	cmp al, 128
	738	jbe PCFVPN_InvalidName
	739	PCFVPN_ValidChar:
	740	cmp al, 'U'
	741	jne PCFVPN_NoMagic
	742	inc dx
	743	PCFVPN_NoMagic:
	744	dec cx
	745	jnz PCFVPN_CheckLoop
	746	pop cx
	747	cmp cx, dx
	748	clc
	749	je PCFVPN_WasMagic
	750	stc
	751	PCFVPN_WasMagic:
	752	ret
	753	PCFVPN_InvalidName:
	754	pop cx
	755	clc
	756	ret
[31]	757	PART_CheckForValidPartName EndP
	758
	759
[52]	760
[31]	761	; Compare a volume-label in the IPT to the install-volume
	762	; SI holds pointer to entry in IPT
	763	; CY set if this entry is also the install-volume
	764	PART_IsInstallVolume Proc Near Uses ax cx dx si di
[51]	765	cld ; Advance upwards with lodsb
[67]	766	mov di, offset OS2_InstallVolume ; Address of install-volume label (max. 11 chars)
[31]	767
[51]	768	mov cx, 11 ; Maximum length of label
	769	xor dl, dl ; Not found yet
[31]	770
	771	; Compare next character
	772	PART_IsInstallVolumeNext:
[51]	773	lodsb ; Load byte from SI (IPT-entry)
	774	;cmp al,' ' ; If space then use zero
	775	;jne PART_IsInstallVolume_skip1
	776	;xor al,al
	777	PART_IsInstallVolume_skip1:
	778	xchg ah,al ; Save char to AH
	779	xchg si,di ; Exchange pointers
	780	lodsb ; Load byte from SI (install-volume label)
	781	;cmp al,' ' ; If space then use zero
	782	;jne PART_IsInstallVolume_skip2
	783	;xor al,al
	784	PART_IsInstallVolume_skip2:
	785	xchg si,di ; Reexchange pointers
	786	;~ call AuxIO_Teletype
	787	call CONV_ToUpper
	788	;~ call AuxIO_Teletype
	789	xchg al,ah
	790	;~ call AuxIO_Teletype
	791	call CONV_ToUpper
	792	;~ call AuxIO_Teletype
	793	;~ call AuxIO_TeletypeNL
[31]	794
[51]	795	; Are both of them zero ?
	796	; Then the names could be the same, but cx must not equal 11
	797	; because that would indicate a null-string.
	798	mov dh,al
	799	or dh,ah
	800	jz PART_IsInstallVolumeFound
[31]	801
[51]	802	cmp ah,al ; Are the the same ?
	803	jnz PART_IsInstallVolumeNotFound ; Nope, compare ended
	804	loop PART_IsInstallVolumeNext ; Yep, Compare next character
[31]	805
[51]	806	PART_IsInstallVolumeFound:
	807	; If CX is still 11 this was a zero string
	808	; and thus not a valid volume-name.
	809	; This should not occur as this function is only called when the first
	810	; byte is non-zero.
	811	cmp cx,11
	812	je PART_IsInstallVolumeNotFound
	813	; Found !
	814	mov dl,1 ; Found
	815	jmp PART_IsInstallVolumeEnd
[31]	816
	817
[51]	818	PART_IsInstallVolumeNotFound:
	819	mov dl,0
	820	jmp PART_IsInstallVolumeEnd
[31]	821
	822
[51]	823	PART_IsInstallVolumeEnd:
	824	; Set the status in CY
	825	mov al,dl
	826	add al,'0'
	827	;~ call AuxIO_TeletypeHexByte
	828	;~ call AuxIO_TeletypeNL
	829	rcr dl,1 ; Put found-flag in CY
	830	ret
[31]	831	PART_IsInstallVolume EndP
	832
	833
	834
	835
[32]	836
[52]	837
[49]	838	; If found CY=1, AL=partnum, else CY=0, AL=0FFH
[52]	839	; BOOKMARK: Setup Phase1
[49]	840	PART_SetupPhase1 Proc Uses bx cx dx si di
[32]	841
[51]	842	;
	843	; Enumberate Bootable Systems by name
	844	; and prepare Phase 1 if active.
	845	;
	846	; This can also be implemented using the
	847	; Installable LVM-flag I think.
	848	; But at the time I had lesser knowledge about LVM...
	849	; So this algorithm may change in the future.
	850	;
	851	mov byte ptr [Phase1Active],0 ; Clear phase1 indicator
	852	mov si, offset PartitionTable ; Pointer to IPT
	853	xor cx,cx
	854	mov cl,[CFG_Partitions] ; Partitions in IPT
[49]	855
	856	; Process next entry in IPT
	857	MBR_Parts:
[51]	858	add si, 4
	859	;push si
	860	;push si
	861	;call MBR_TeletypeVolName
	862	;pop si
	863	call PART_IsInstallVolume ; Check if this is install-volume
	864	jnc MBR_Parts_NI
[49]	865
[51]	866	;
	867	; Install Volume found
	868	;
	869	mov byte ptr [Phase1Active],1 ; Set phase1 indicator
[49]	870
[51]	871	mov al,' '
	872	mov bl,7
	873	mov ah, 0eh
	874	int 10h
[49]	875
[51]	876	mov al,'('
	877	mov bl,7
	878	mov ah, 0eh
	879	int 10h
[49]	880
	881
	882
[51]	883	mov al,[CFG_Partitions]
	884	sub al,cl
[49]	885
[51]	886	mov dh,al
[49]	887
	888
[51]	889	mov [CFG_PartAutomatic],al ; Setup entry for install-volume
	890	mov [CFG_PartLast],al
[49]	891
[51]	892	add al,'1'
	893	mov bl,7
	894	mov ah, 0eh
	895	int 10h
[49]	896
[51]	897	mov al,')'
	898	mov bl,7
	899	mov ah, 0eh
	900	int 10h
[49]	901
[51]	902	;mov bx,cx ; ????
[49]	903
[51]	904	mov al,dh
	905	stc
	906	jmp PART_SetupPhase1_found
[49]	907
	908	MBR_Parts_NI:
[51]	909	;xor si,si
	910	;call MBR_TeletypeNL
	911	;pop si
	912	add si, 30 ; Add remainder of IPT entry
	913	loop MBR_Parts
[49]	914
[51]	915	mov al,0ffh
	916	clc
[49]	917
	918	PART_SetupPhase1_found:
	919
[51]	920	ret
[49]	921
	922	PART_SetupPhase1 EndP
	923
	924
	925
	926
	927	;~ PART_GetOldPartitionCount Proc Uses cx dx di
	928	;~ mov di,offset [PartitionXref]
[51]	929	;~ mov dx,LocIPT_MaxPartitions
[49]	930	;~ mov cx,dx
	931	;~ mov al,0ffh
	932	;~ cld
	933	;~ repne scasb
	934	;~ inc cx
	935	;~ sub dx,cx
	936	;~ mov ax,dx
	937	;~ ret
	938	;~ PART_GetOldPartitionCount EndP
	939
	940
	941
[51]	942
	943
	944	;~ HELEMAAL NAKIJKEN !
	945	;~ DRIVELETTER ASIGNMENT CORRIGEREN
[67]	946	;~ WORDT TOCH BOOTDRIVE IN BPB GEZET ALS NON-OS/2 SYSTEEM BOOT ?
[51]	947
	948
	949
[30]	950	; ###################
	951	; # START PARTITION #
	952	; ###################
	953
[8]	954	; Starts Partition DL from Internal Partition Table.
	955	; In: DL - Number of partition (filtered view)
	956	; Out: No Return...
[36]	957	; Destroyed: None, due to no return ;-)
[51]	958	; Logic: - Harddrive: loads partition Table
	959	; sets partition active
	960	; saves partition table
	961	; hides partitions, if needed
	962	; Linux-Support, if needed
	963	; load boot sector
	964	; VIBR checking, if wanted
	965	; install MBR Protection, if wanted
	966	; Special Boot Support, if needed (OS/2 Extended partitions)
	967	; Copy boot-sector to StartBase
	968	; run boot sector...
[8]	969	PART_StartPartition Proc Near Uses ax dx es di
[111]	970
[51]	971	;
	972	; Local Storage for this much too large function.
	973	;
	974	local BootPartNo:byte
	975	local PhysDiskBpbIndex:word ; Index into BPB to field of phys-disk
	976	local FSType:byte ; The FS used on the loaded BPB
[36]	977	; Only used for FAT/HPFS/JFS
[51]	978	local LVMdl:byte ; LVM drive-letter
	979	local BPBdl:byte ; BPB boot-drive-letter. (at 25h)
[36]	980
[159]	981	IFDEF AUX_DEBUG
[164]	982	IF 0
[159]	983	DBG_TEXT_OUT_AUX 'PART_StartPartition:'
	984	PUSHRF
	985	call DEBUG_DumpRegisters
	986	;~ call AuxIO_DumpParagraph
	987	;~ call AuxIO_TeletypeNL
	988	POPRF
	989	ENDIF
	990	ENDIF
[8]	991
[51]	992	; Get Partition-Pointer (SI) to Partition-To-Boot (DL).
	993	; DL is filtered partition number and thus uses the PPT.
	994	; Returned is the address of the IPT entry of the partition to boot.
	995	call PART_GetPartitionPointer
[8]	996
	997
[51]	998	;
	999	; SI now points to the IPT entry for the partition to be booted.
	1000	;
[8]	1001
[36]	1002
[51]	1003	; This converts DL filered view to straight view, aka index into the IPT.
	1004	; Needed for later.
	1005	; Destroys AX,BX
	1006	call PART_ConvertToStraight
[36]	1007
[51]	1008	; Save for later use.
	1009	mov [BootPartNo], dl
	1010	; Straight - FFh -> Floppy boot
	1011	; FEh -> BIOS continue (CD-ROM, ZIP, etc.)
[36]	1012
[51]	1013	; This converts the PPT to have pointers to all the IPT entries.
	1014	; We need straight pointers from now on, so calculate the table...
	1015	; Destroys AX,BX,CX
	1016	call PART_CalculateStraightPartPointers
	1017
	1018
	1019
	1020	; SI contains the pointer to the IPT to what partition to boot
	1021	; in this whole routine...it may never get messed up.
	1022
	1023	; ------------------------------------------------- PRINT NAME BEING BOOTED
	1024
	1025	push si
	1026	mov dl, [si+LocIPT_Drive] ; Disk where partition resides
	1027	mov dh, [si+LocIPT_SystemID] ; AB FileSystem ID (08=NTFS, FC=JFS)
	1028	; Copy Partition-Name to BootingNow area for display purposes
	1029	add si, LocIPT_Name ; Advance to AB partition-name
	1030	mov cx, 11 ; Max. length of AB name/label
	1031	call GetLenOfName ; Returns CX with length of label
	1032	mov di, offset TXT_BootingNowPartName
	1033	jz PSP_NoName ; Don't copy if zero length label
	1034	rep movsb ; Copy label-name to boot
	1035	PSP_NoName:
	1036	xor al, al ; Null-terminate label-string
	1037	stosb ; Ending Zero
	1038
	1039	;
	1040	; Display "Booting the system using "
	1041	;
	1042	mov si, offset TXT_BootingNow1
	1043	call MBR_Teletype
	1044
	1045	;~ pusha
	1046	;~ call MBR_Teletype
	1047	;~ mov si,offset TXT_BootingNowPartName
	1048	;~ call MBR_Teletype
	1049	;~ popa
[36]	1050
	1051
[51]	1052	;
	1053	; DL will be zero for floppy-disk or 80h+ for harddisk.
	1054	; Note thus that DL contains the BIOS disk numer and not the AB value
	1055	; for floppy or cdrom.
	1056	;
	1057	or dl, dl
	1058	jnz PSP_IsHarddisc
[8]	1059
[51]	1060	; When booting floppy/CD-ROM/etc., we got other text to be displayed...
	1061	mov si, offset TXT_BootingNowPartName
	1062	call MBR_TeletypeVolName
	1063	jmp PSP_IsFloppyCDROMetc ; JUMPS BUITEN SI POP !!! AANPASSEN
	1064
	1065
	1066	PSP_IsHarddisc:
[31]	1067
[36]	1068
[51]	1069	;
	1070	; Save configuration on HDD boots (save CFG_PartLast)
	1071	;
	1072	call DriveIO_SaveConfiguration
[36]	1073
[31]	1074
[51]	1075	;
	1076	; Prints out BootingNow2 including PartitionName
	1077	;
	1078	mov si, offset TXT_BootingNowPartName
	1079	call MBR_TeletypeVolName
	1080	mov si, offset TXT_BootingNowPartition
	1081	call MBR_Teletype
[36]	1082
[51]	1083	; restores SI (IPT-pointer)
	1084	pop si
[36]	1085
[8]	1086
	1087
[51]	1088	;
	1089	; Get the CHS and LBA location of sector containing
	1090	; the partition-table for the partition.
	1091	;
	1092	mov ax, wptr [si+LocIPT_AbsolutePartTable+0]
	1093	mov bx, wptr [si+LocIPT_AbsolutePartTable+2]
	1094	mov cx, wptr [si+LocIPT_LocationPartTable+1]
	1095	mov dh, bptr [si+LocIPT_LocationPartTable+0]
	1096	mov dl, [si+LocIPT_Drive]
[8]	1097
[51]	1098	IFDEF AUX_DEBUG
[170]	1099	IF 0
[117]	1100	pushf
	1101	pusha
	1102	mov si,offset [ptetb]
	1103	call AuxIO_Print
	1104	call DEBUG_DumpRegisters
	1105	call AuxIO_TeletypeNL
	1106	mov ax, word ptr [FreeDriveletterMap+00h]
	1107	mov dx, word ptr [FreeDriveletterMap+02h]
	1108	call AuxIO_TeletypeBinDWord
	1109	popa
	1110	popf
	1111	ENDIF
[51]	1112	ENDIF
[8]	1113
[36]	1114
[51]	1115	;
	1116	; This loads the MBR in case of PRI or the EBR in case of LOG partitions.
	1117	;
[52]	1118	; BOOKMARK: PBR/EBR loading
[51]	1119	call DriveIO_LoadPartition ; Load Table... [LOAD]
[36]	1120
[8]	1121
[51]	1122	; -------------------------------------------------- MODIFY PARTITION TABLE
	1123
	1124	; Make sure ES is correctly setup.
	1125	push cs
	1126	pop es
	1127
	1128	; ES:DI - First Partitionentry
	1129	mov di, offset PartitionSector+446
	1130
	1131	; Remove all active-flags for safety reasons, primary partition table will
	1132	; have one partition set active by ScanPartition-routine.
	1133	push di
	1134	mov cl, 4
	1135	PSP_RemoveActiveFlagLoop:
	1136	and bptr es:[di+LocBRPT_Flags], 7Fh
	1137	add di, LocBRPT_LenOfEntry
	1138	dec cl
	1139	jnz PSP_RemoveActiveFlagLoop
	1140	pop di
	1141
	1142
	1143	;
	1144	; Put the partition-to-be-booted location into registers...
	1145	;
	1146	mov ax, wptr [si+LocIPT_AbsoluteBegin+0]
	1147	mov bx, wptr [si+LocIPT_AbsoluteBegin+2]
	1148	sub ax, wptr [si+LocIPT_AbsolutePartTable+0]
	1149	sbb bx, wptr [si+LocIPT_AbsolutePartTable+2]
	1150
	1151
	1152	; BX:AX - absolute position of partition relative to partition table
	1153	; ...and search for it...
	1154	PSP_SearchLoop:
	1155	cmp ax, wptr es:[di+LocBRPT_RelativeBegin]
	1156	jne PSP_SearchMismatch
	1157	cmp bx, wptr es:[di+LocBRPT_RelativeBegin+2]
	1158	jne PSP_SearchMismatch
	1159	jmp PSP_SearchMatch
	1160	PSP_SearchMismatch:
	1161	add di, LocBRPT_LenOfEntry ; 16 Bytes per Partition-Entry
	1162	cmp di, 500+offset PartitionSector
	1163	jb PSP_SearchLoop
	1164
	1165	;
	1166	; Entry not found, Halt System.
	1167	;
	1168	jmp MBR_HaltSystem
	1169
	1170	; ------------------------------------------------------------- ENTRY FOUND
	1171	PSP_SearchMatch:
	1172	or byte ptr es:[di+LocBRPT_Flags], 80h ; set ACTIVE partition
	1173
	1174
	1175
	1176	;
	1177	; Save the Partition Table.
	1178	;
	1179	call DriveIO_SavePartition ; Saves the Partition-Table [SAVE]
	1180
	1181
	1182
[67]	1183	; --------------------------------------------------------------- OS/2 I13X
[51]	1184	; Now check if the partition to get booted is above 8 GB.
	1185	; If yes, set magic bytes 'I13X' at 3000:0 for boot-loader to recognize.
	1186	; This method is (c) by IBM <g>
	1187	; Rousseau: Booting IBM-BM also requires the LBA address of the IBM-BM
	1188	; partitionafter the 'I13X' signature.
	1189	; Also, FS needs to be set to 3000H.
	1190	; This info was obtained by examining the LVM 2,x MBR-code.
	1191	mov ax, wptr [si+LocIPT_AbsoluteBegin+0]
	1192	mov bx, wptr [si+LocIPT_AbsoluteBegin+2]
	1193	add ax, wptr es:[di+LocBRPT_AbsoluteLength+0] ; Add length to absolute
	1194	adc bx, wptr es:[di+LocBRPT_AbsoluteLength+2] ; begin location
	1195	; BX:AX -> Absolute End-Position of Partition
	1196
	1197
	1198	;
[54]	1199	; Always use INT13X v1.0.8+.
[51]	1200	;
	1201	;~ test byte ptr [CFG_ForceLBAUsage], 1
[50]	1202	;~ jnz PSP_ForceI13X
	1203	jmp PSP_ForceI13X
	1204
[51]	1205	; LBA-boundary at 16450560 (FB0400h) (16320x16x63)
	1206	cmp bx, 00FBh
	1207	jb PSP_NoI13X
[36]	1208
[51]	1209	;
[52]	1210	; BOOKMARK: Setup 'I13X' signature.
[51]	1211	;
	1212	PSP_ForceI13X:
[40]	1213	push es
	1214	push di
	1215	push si
[30]	1216
[51]	1217	; Setup ES and FS.
	1218	; FS needs to keep this address.
	1219	mov ax, 3000h
	1220	mov es, ax
	1221	; mov fs,ax
	1222	db 08eh
	1223	db 0e0h
[30]	1224
[51]	1225	; Insert signature
	1226	xor di, di
	1227	mov word ptr es:[di+00], '1I'
	1228	mov word ptr es:[di+02], 'X3'
[36]	1229
[51]	1230	;mov wptr es:[di], 0
	1231	;mov wptr es:[di+2], 0
[36]	1232
[51]	1233	; Insert LBA address.
	1234	mov ax, [si+LocIPT_AbsoluteBegin+0]
	1235	mov es:[di+04], ax
	1236	mov ax, [si+LocIPT_AbsoluteBegin+2]
	1237	mov es:[di+06], ax
[36]	1238
[40]	1239	pop si
	1240	pop di
	1241	pop es
[36]	1242
	1243
	1244
[51]	1245	PSP_NoI13X:
[8]	1246
[51]	1247	; now check, if we need to hide any partition
	1248	test byte ptr [si+LocIPT_Flags], Flags_HideFeature
	1249	jz PSP_NoHideFeature
[45]	1250
[51]	1251	; ---------------------------------------------------- PARTITION HIDING
[45]	1252
[51]	1253	; display "hide active"
	1254	push si
	1255	mov si, offset TXT_BootingHide
	1256	call MBR_Teletype
	1257	pop si
	1258
	1259
	1260	; First, find Hide-Config
	1261	mov dl, [BootPartNo] ; EntryNumber is straight view
	1262	;~ mov ax, LocIPT_MaxPartitions
	1263	mov ax, LocHPT_LenOfHPT
	1264	mul dl
	1265	mov di, offset HidePartitionTable
	1266	add di, ax ; We got the pointer
	1267
	1268
[45]	1269	; So process Hide-Config. Read out Bitfield-Entries,
	1270	; each points to a partition.
	1271	; 3Fh is end-marker / maximum entries = CFG_Partitions
[51]	1272	mov cl, [CFG_Partitions]
	1273	mov ch,0 ; Index in bitfield array.
	1274	mov dh,6 ; Bitfield width.
	1275	mov bx,di ; Pointer to entry.
	1276
[45]	1277	PSP_PartitionsHideLoop:
	1278	mov dl,ch
	1279	call CONV_GetBitfieldValue
	1280	mov dl,al
	1281
	1282	;~ mov dl, es:[di]
	1283	;~ inc di
	1284	;~ cmp dl, 0FFh
	1285	cmp dl,3fh ; Max value for 6-bits field.
	1286	je PSP_EndOfHideProcess ; -> End of Hiding
	1287	call PART_HidePartition ; Now hide that partition
	1288	inc ch ; Next bitfield.
	1289	dec cl
	1290	jnz PSP_PartitionsHideLoop
[51]	1291
	1292
[45]	1293	PSP_EndOfHideProcess:
	1294
[51]	1295	; --- HIDE COMPLETED ---
	1296	; So something got hidden and we have to remark a primary partition,
[78]	1297	; if we are booting something non-primary from the boot-disk.
	1298	mov al, [BIOS_BootDisk]
	1299	cmp bptr [si+LocIPT_Drive], al
	1300	jne PSP_HideAdjustPrimaryMark ; When booting any hdd, but boot-disk
[51]	1301	mov ax, wptr [si+LocIPT_AbsolutePartTable]
	1302	mov bx, wptr [si+LocIPT_AbsolutePartTable+2]
	1303	or ax, ax
	1304	jnz PSP_HideAdjustPrimaryMark ; or booting non-primary partition
[78]	1305	or bx, bx ; on boot-disk.
[51]	1306	jz PSP_NoHideAdjustPrimaryMark
	1307
	1308	PSP_HideAdjustPrimaryMark:
	1309	; Load Primary Partition Table...
	1310	xor ax, ax
	1311	xor bx, bx
	1312	mov cx, 0001h ; Cylinder 0, Sector 1
[78]	1313	xor dh, dh ; Head 0
	1314	mov dl, [BIOS_BootDisk] ; Boot Disk
	1315
	1316	; This uses the boot-disk and alters 'CurPartition_Location'.
	1317	; CHECKME: How does 81h being the boot-disk influences this ?
[51]	1318	call DriveIO_LoadPartition ; Load Primary Partition Table
[78]	1319
	1320	; This would only be needed for very old BIOSses
[51]	1321	call PART_MarkFirstGoodPrimary
[30]	1322
[78]	1323	; CHECKME: Disabled writing back MBR with modified boot flags
	1324	; This is a safety measure now that booting AirBoot from other disks
	1325	; than 80h can occur.
	1326	;~ call DriveIO_SavePartition ; Saves the Partition-Table
[8]	1327
[78]	1328
[51]	1329	PSP_NoHideAdjustPrimaryMark:
[8]	1330
	1331
[51]	1332	PSP_NoHideFeature:
	1333	; Check, if we are supposed to ignore LVM altogether...
	1334	test byte ptr [CFG_IgnoreLVM], 1
	1335	jnz PSP_NoLVMReassignment
[8]	1336
[51]	1337	; ---------------------------------------------------- LVM REASSIGNMENT
	1338
	1339	; Driveletter must be set for this partition
	1340	test byte ptr [si+LocIPT_Flags], Flags_DriveLetter
	1341	jz PSP_NoLVMReassignment
	1342	;movzx bx, BootPartNo ; EntryNumber is straight view
	1343	mov bl,[BootPartNo] ; EntryNumber is straight view
	1344	mov bh,0
	1345
	1346	mov al, bptr [DriveLetters+bx]
	1347	sub al, 3Dh ; Convert e.g. 80h -> 'C'
	1348	cmp al, bptr [PartitionVolumeLetters+bx]
	1349
	1350
	1351	;~ je PSP_NoLVMReassignment ; If driveletters match -> no change
	1352	; Rousseau:
	1353	; But there can still be other partitions with the same drive-letter.
	1354	; For instance if the user did an advanced installation with multiple
	1355	; eComStation systems using the same boot-drive-letter.
	1356	; So, even if the drive-letter forced is the same as the
	1357	; partition-volume-letter, other partitions still need to be checked
	1358	; and possibly hidden. So we always do the drive-letter reassignment,
	1359	; which is enhanced to keep data-partitions (those -not- in the Menu)
	1360	; visible. So the 'je' instruction above is commented-out.
	1361
	1362
	1363	;
	1364	; Give partition SI letter AL
	1365	;
	1366	call LVM_DoLetterReassignment
	1367
	1368
	1369
	1370
	1371	PSP_NoLVMReassignment:
	1372	push si
	1373	; -------------------------------------------------- -"PLEASE WAIT..."-
	1374	PSP_IsFloppyCDROMetc:
	1375	mov si, offset TXT_BootingWait
	1376	call MBR_Teletype ; display "please wait" ; SI staat nog op stack; aanpassen !!!!
	1377	pop si
	1378
	1379	; Process Partition Tables, if M$-Hack required (changes Ext Part Type)
	1380	call MSHACK_ProcessPartTables
	1381
	1382	test byte ptr [CFG_BootMenuActive], 0FFh
	1383	jz PSP_NoMenuNoSound
	1384
	1385	; ---------------------------------------------------------- BOOT-SOUND
	1386	call SOUND_ExecuteBoot
	1387
	1388	PSP_NoMenuNoSound:
	1389
	1390	; --------------------------------------------- SPECIAL BOOT PROCESSING
	1391	; Check here, if the Boot shall be done via resume to BIOS...
	1392	mov al, byte ptr [si+LocIPT_SystemID]
	1393	cmp al, 0FEh ; Via BIOS ? (aka resume BIOS boot sequence)
	1394	je PSP_ResumeBIOSbootSeq
	1395
	1396	jmp PSP_StartNormal
[8]	1397
[51]	1398	PSP_ResumeBIOSbootSeq:
	1399	int 18h ; Give control back to BIOS
	1400	db 0EAh ; if return to here -> Reboot
	1401	dw 0FFF0h
	1402	dw 0F000h
	1403
[8]	1404
[51]	1405	; =======================================================================
	1406	; FROM THIS POINT ON, ONLY DS and SI REGISTER IS NEEDED TO BE PRESERVED
	1407	; =======================================================================
[8]	1408
[51]	1409	PSP_StartNormal:
	1410	mov ax, wptr [si+LocIPT_AbsoluteBegin+0]
	1411	mov bx, wptr [si+LocIPT_AbsoluteBegin+2]
	1412	mov cx, [si+LocIPT_LocationBegin+1]
	1413	mov dh, [si+LocIPT_LocationBegin+0]
	1414	mov dl, [si+LocIPT_Drive]
[36]	1415
[51]	1416	; This loads the PBR of the partition.
	1417	call DriveIO_LoadPartition ; Loads boot-sector... [PARTBOOTSEC]
[36]	1418
[51]	1419	;
	1420	; The JFS PBR-code does not use the passed BPB in memory but uses the BPB
	1421	; on disk. This breaks the drive-letter feature on JFS.
	1422	; So we make a copy of the PBR in memory, and if the partition is JFS
	1423	; we later adjust the physical-disk and boot-drive-letter in this
	1424	; copy and write it back to disk.
	1425	; Then the JFS PBR-code will see the correct boot-drive-letter.
	1426	;
	1427	pusha
	1428	mov si,offset [PartitionSector]
	1429	mov di,offset [PBRSector]
	1430	mov cx,100h
	1431	cld
	1432	rep movsw
	1433	popa
[36]	1434
	1435
	1436
[51]	1437	; Check if the disk is a harddisk or a floppy.
	1438	mov dl,[si+LocIPT_Drive]
	1439	cmp dl, 80h
	1440	jae is_harddisk
[36]	1441
[51]	1442	;
	1443	; This is a dirty hack to fix booting from a floppy.
	1444	; With all the modifications made since v1.06 this feature was broken
	1445	; because Int13X is used implicitly now, and that does not work
	1446	; for diskette access.
	1447	; This jumps to the code that loads and starts the pbr-code.
	1448	; Note that it also skips virus checking !
	1449	; This will be fixed at a later date.
	1450	jmp boot_from_floppy
[36]	1451
[51]	1452	;
	1453	; The disk is a harddisk so we need to do various checks and fixes.
	1454	;
	1455	is_harddisk:
[36]	1456
[51]	1457	test byte ptr [CFG_DetectVIBR], 1
	1458	jz PSP_NoVIBR
	1459	test byte ptr [si+LocIPT_Flags], Flags_VIBR_Detection
	1460	jz PSP_NoVIBR
[36]	1461
[52]	1462
[51]	1463	; ----------------------------------------------------- CHECKS FOR VIBR
[52]	1464	; BOOKMARK: Check for virus in PBR
[51]	1465	push si
	1466	mov si, offset PartitionSector
	1467	mov bx, 4B4Dh ; Magic: 'MK'
	1468	call MBR_GetCheckOfSector
	1469	pop si
[8]	1470
[51]	1471	cmp [si+LocIPT_BootRecordCRC], bx
	1472	je PSP_NoVIBR
	1473	mov bx, [si+LocIPT_BootRecordCRC]
	1474	or bx, bx
	1475	jz PSP_NoVIBR
	1476	; Oh Oh, got a virus :(
	1477	mov si, offset TXT_VirusFoundMain
	1478	call MBR_Teletype
	1479	mov si, offset TXT_VirusFound2 ; VIBR-Virus
	1480	call MBR_Teletype
	1481	mov si, offset TXT_VirusFoundEnd
	1482	call MBR_Teletype
	1483	jmp MBR_HaltSystem
[8]	1484
[51]	1485	PSP_NoVIBR:
	1486	test byte ptr [CFG_ProtectMBR], 1
	1487	jz PSP_NoMBRprotect
	1488	; --------------------------------------------- INSTALLS MBR-PROTECTION
	1489	; We need DS:SI later...
	1490	push ds
	1491	push si
[8]	1492
[51]	1493	; First subtract 1024 bytes from Base-Memory...
	1494	push ds
	1495	mov ax, 40h
	1496	mov ds, ax
	1497	mov dx, word ptr ds:[13h]
	1498	dec dx ; 1 == 1kbyte
	1499	mov word ptr ds:[13h], dx
	1500	pop ds
	1501	shl dx, 6 ; trick, now DX is a segment
[8]	1502
[51]	1503	; Now copy in our code (to DX:0)...
[8]	1504
[51]	1505	mov si, offset MBR_Protection ; DS:SI - Source Image
	1506	mov es, dx
	1507	xor di, di ; ES:DI - Destination
	1508	;~ mov cx, 512
	1509	mov cx, 384
	1510	rep movsw ; Move 768 bytes...
[30]	1511
[51]	1512	; Now fill in variables...
[30]	1513
[51]	1514	xor ax, ax
	1515	mov ds, ax
	1516	mov si, 10h*4
	1517	xor di, di ; INT 10h Vector to MBR Protection
	1518	;movsd
	1519	movsw
	1520	movsw
[8]	1521
[51]	1522	mov si, 13h*4 ; INT 13h Vector to MBR Protection
	1523	;movsd
	1524	movsw
	1525	movsw
[8]	1526
[51]	1527	mov al, CFG_IgnoreWriteToMBR ; Option to MBR Protection
	1528	stosb
[8]	1529
[51]	1530	; Now switch INT 13h vector to MBR Protection
[32]	1531
[51]	1532	sub si, 4
	1533	mov ax, 9
	1534	mov ds:[si], ax
	1535	mov ds:[si+2], dx ; Vector hardcoded at DS:0009
	1536	; MBR-Protection now active :)
[32]	1537
[51]	1538	; Restore DS:SI
	1539	pop si
	1540	pop ds
[32]	1541
	1542
	1543
	1544	PSP_NoMBRprotect:
	1545
	1546	; Display volume-name in bold
	1547	; Just before booting the selected partition
[36]	1548	;pushf
	1549	;pusha
	1550	;push si
	1551	;add si, LocIPT_Name
	1552	;call MBR_TeletypeVolName
	1553	;xor si,si
	1554	;call MBR_TeletypeNL
	1555	;pop si
	1556	;popa
	1557	;popf
[32]	1558
	1559
	1560
[34]	1561
[36]	1562
[8]	1563	; ------------------------------------------------ SPECIAL PARTITION SUPPORT
	1564	; needed by OS/2 Warp / eComStation
	1565
[30]	1566
[34]	1567	;cmp byte ptr [si+LocIPT_SystemID],08 ; I hate Microsuck NTFS check
[32]	1568	mov di, offset PartitionSector ; ES:DI - Actual Boot-Record
[30]	1569
[32]	1570	; Special Support Detection
[34]	1571	;mov ax, word ptr es:[di+18h]
	1572	;cmp ax, 003Fh ; Physical Layout-Sectors... Safety check
[30]	1573
	1574
[34]	1575
	1576	;
[36]	1577	; At this point, SI points to IPT and DI points to the PBR from disk.
[34]	1578	; Depending on the type of BPB used, the physical disk field is at
	1579	; different locations: 24h for old-style (OS/2) BPB's and 40h for
	1580	; FAT32 BPB's.
	1581	; The OS/2 boot-drive-letter is located at 25h in an old-style BPB,
	1582	; while the corresponding field in a FAT32 BPB is located at 41h but
	1583	; used for different purposes.
	1584	; In case of HPFS, using old-style BPB's, the boot-drive-letter needs
	1585	; to be adjusted if it is zero.
	1586	; In that case we trace the LVM-info for that partition and use the
	1587	; drive-letter defined there.
	1588	; This fixes issues #3067 and #3119.
	1589	; Adjusting the physical disk is always done but at different locations
	1590	; depending on the BPB used.
	1591	; Also, the "hidden sectors" field is adjusted to contain the absolute
	1592	; offset from the start of the disk instead of the relative offset to
	1593	; the start of the partition.
	1594	; http://homepage.ntlworld.com./jonathan.deboynepollard/FGA/bios-parameter-block.html
	1595	;
	1596
	1597
	1598	; Get index of phys-disk field in BX
	1599	call PART_GetFieldIndex
[51]	1600	mov [PhysDiskBpbIndex],ax
[34]	1601	mov bx,ax
	1602
[36]	1603	; Locate cursor for output of debug-info
[51]	1604	;~ pusha
	1605	;~ mov ch,7
	1606	;~ mov cl,0
	1607	;~ call VideoIO_Color
	1608	;~ mov ch,6
	1609	;~ mov cl,1
	1610	;~ call VideoIO_Locate
	1611	;~ popa
[36]	1612
[49]	1613
[36]	1614	; Debug display physdisk, ptype and physdisk offset in BPB
[49]	1615	;~ pusha
	1616	;~ mov ah,[si+LocIPT_Drive]
	1617	;~ mov al,[si+LocIPT_SystemID]
	1618	;~ call VideoIO_PrintHexWord
	1619	;~ mov ax,bx
	1620	;~ call VideoIO_PrintHexWord
	1621	;~ mov ax,[si+LocIPT_AbsolutePartTable+02]
	1622	;~ call VideoIO_PrintHexWord
	1623	;~ mov ax,[si+LocIPT_AbsolutePartTable+00]
	1624	;~ call VideoIO_PrintHexWord
	1625	;~ mov al,[ExtendedAbsPosSet]
	1626	;~ call VideoIO_PrintHexByte
	1627	;~ mov al,'-'
	1628	;~ call VideoIO_PrintSingleChar
	1629	;~ mov al,byte ptr [Menu_EntrySelected]
	1630	;~ call VideoIO_PrintHexByte
	1631	;~ mov al,byte ptr [CFG_PartAutomatic]
	1632	;~ call VideoIO_PrintHexByte
	1633	;~ mov al,byte ptr [Phase1Active]
	1634	;~ call VideoIO_PrintHexByte
	1635	;~ mov al,byte ptr [NewPartitions]
	1636	;~ call VideoIO_PrintHexByte
	1637	;~ mov al, byte ptr [OldPartitionCount]
	1638	;~ call VideoIO_PrintHexByte
	1639	;~ popa
[34]	1640
[36]	1641
	1642	;
	1643	; If the partition is IBM-BM we skip all the BPB adjustments.
	1644	; IBM-BM does no need them.
	1645	;
	1646	cmp byte ptr [si+LocIPT_SystemID], 0ah
	1647	jnz no_os2_bm
	1648	jmp chainload_ibm_bm
	1649
	1650
	1651	no_os2_bm:
	1652
	1653	;
[40]	1654	; Update the phys-disk field
	1655	; DI points to PartitionSector
	1656	; BX holds index to phys-disk field
[36]	1657	;
[51]	1658	mov al,byte ptr [si+LocIPT_Drive] ; Moet dit niet later gebeuren ??? (NT/WIN LDR hangs)
[34]	1659	mov es:[di+bx],al
	1660
	1661
	1662	;
[36]	1663	; Legacy systems do not put the correct values in the "hidden sectors"
	1664	; field. Also, this field will be incorrect if a partition is moved on
	1665	; disk by a disktool not accounting for this field.
	1666	; Linux does not have a BPB at all, and does not use this field.
	1667	; So we set the correct value here obtained by the partition scanner.
	1668	; This fixing is done by OS/2 BM as well, according to Martin.
	1669	;
	1670
[52]	1671	; BOOKMARK: Fix hidden sectors field
[51]	1672	mov ax,[si+LocIPT_AbsoluteBegin]
	1673	mov es:[di+1ch], ax ; Low word of 32-bits "hidden sectors"
[34]	1674
	1675	mov ax,[si+LocIPT_AbsoluteBegin+2]
[51]	1676	mov es:[di+1eh], ax ; High word of 32-bits "hidden sectors"
[34]	1677
	1678	;
	1679	; Check partitions to see if boot-drive-letter fixing is needed.
	1680	; FAT12/FAT16/HPFS/JFS will have the value at 25h fixed
	1681	; to the LVM-info drive-letter. (+3dh to convert to BIOS notation)
	1682	;
	1683
	1684
	1685	; Setup partition disk and LBA address
	1686	mov dl,byte ptr [si+LocIPT_Drive]
	1687	mov cx,[si+LocIPT_AbsoluteBegin+00h]
	1688	mov bx,[si+LocIPT_AbsoluteBegin+02h]
	1689
	1690	; AL is gonna be used to shift-in CY status.
	1691	; If the type of file-system is one of FAT12/FAT16/HPFS/JFS then
	1692	; AL will be <> 0 and the boot-drive-letter can be tested / fixed.
	1693	mov al,0
	1694
[36]	1695
[52]	1696	;
[36]	1697	; The PBR is already loaded, no need to load it again in the
	1698	; calls below.
	1699	;
	1700	; Better use the already done discovery to determine the system.
	1701	;
[52]	1702	; FIXME: PBR Already loaded
[67]	1703
[34]	1704	; When FAT12/FAT16/HPFS/JFS then boot-drive-letter can be tested
	1705	; or adjusted.
	1706	call PART_IsJFS
	1707	rcl al,1
	1708	call PART_IsHPFS
	1709	rcl al,1
	1710	call PART_IsFAT
	1711	rcl al,1
	1712	mov ah,al
	1713
[36]	1714	; Store for later reference.
	1715	mov [FSType],al
[34]	1716
[36]	1717
	1718	;
	1719	; When the phys-disk byte (80h) is put in this BPB in RAM,
	1720	; Windows will not find it's loader if Windows itself
	1721	; is installed in a logical partition but the loader is on FAT
	1722	; in a primary.
	1723	; This goes for all NT-based versions ?
	1724	;
	1725
	1726
	1727	;
	1728	; See if phys-disk / boot-drive-letter fix is needed
	1729	; depending on FS used.
[34]	1730	; AL will be 0 for any file-system other than FAT12/FAT16/HPFS/JFS.
[51]	1731	; In that case no fixing of boot-drive-letters is needed.
[36]	1732	;
[34]	1733	test al,al
	1734	jz bdl_ok
	1735
[36]	1736
[51]	1737	;
	1738	; We have a partition that potentially can have incorrect values
	1739	; for the boot-drive-letter or incorrect LVM drive-letters.
	1740	;
	1741	; The boot-drive-letter can be zero as the result of copying / moving
	1742	; partitions or restoring a HPFS system from archive.
	1743	; In that case the LVM drive-letter is used if present.
	1744	;
	1745	; Incorrect LVM drive-letters are the result of the drive-letter
	1746	; reassign function when two or more eComStation installations use the
	1747	; same boot-drive-letter.
	1748	; In that case the boot-drive-letter is assigned to the
	1749	; LVM drive-letter.
	1750	;
	1751	; If both are zero there is no way to obtain the correct
	1752	; boot-drive-letter value. The user needs to examine CONFIG.SYS and
	1753	; force that letter for the partition.
	1754	;
[36]	1755
[34]	1756
	1757
[51]	1758
	1759
[34]	1760	;
[51]	1761	; Get the drive-letter for the partition from the LVM-info.
[155]	1762	; Returns CY=0 if AL contains drive-letter, '*' or 0.
	1763	; Returns CY=1 and AL=0 if no LVM info found.
	1764	; The new 'LVM_GetDriveLetter' directly uses SI, so the loading of
	1765	; DL, CX and BX is not needed. We'll leave it here for now.
[34]	1766	;
	1767	mov dl,byte ptr [si+LocIPT_Drive]
	1768	mov cx,[si+LocIPT_AbsoluteBegin+00h]
	1769	mov bx,[si+LocIPT_AbsoluteBegin+02h]
[155]	1770
	1771	; Now uses SI, not DL,CX,BX
[34]	1772	call LVM_GetDriveLetter
[155]	1773	;//! CHECKME: No test on LVM info found
[36]	1774
[51]	1775	; Save for later use.
	1776	mov byte ptr [LVMdl], al
	1777
[34]	1778	; See if the drive-letter feature is active.
	1779	; If active, we force the drive-letter from the user.
	1780	test byte ptr [si+LocIPT_Flags], Flags_DriveLetter
[36]	1781
[51]	1782	; Nope, it's not so we don't force the boot-drive-letter.
[34]	1783	jz PSP_NoLogicalSupport
	1784
	1785	; Partition index in BX
[51]	1786	mov bl,[BootPartNo] ; EntryNumber is straight view
[34]	1787	mov bh,0
	1788
[51]	1789	; Get the user specified boot-drive-letter.
	1790	; 80h notation.
[34]	1791	mov al, bptr [DriveLetters+bx]
[36]	1792
[51]	1793	; Safety check for zero value.
	1794	test al,al
	1795	jz PSP_NoValidUserDriveLetter
[36]	1796
[51]	1797	; Convert 80h notation to ASCII.
	1798	sub al,3dh ; 80h - 3dh = 43h = 'C', etc.
[36]	1799
[51]	1800	PSP_NoValidUserDriveLetter:
	1801	; Here we misuse the LVM-dl storage to store the user forced
	1802	; or zero drive-letter.
	1803	mov byte ptr [LVMdl], al
	1804
	1805
[34]	1806	PSP_NoLogicalSupport:
	1807
[51]	1808	; A possibly valid drive-letter has been obtained from either
	1809	; LVM-info or the drive-letter feature.
	1810	; It's in [LDMdl] local storage.
[34]	1811
[36]	1812
[34]	1813
[36]	1814	;
[51]	1815	; Get the boot-drive-letter from the BPB of the partition.
[36]	1816	;
[51]	1817	mov bx, [PhysDiskBpbIndex]
	1818	inc bx
	1819	mov al,es:[di+bx] ; 80h=C:,81h=D:, etc.
	1820	; Store it for later use
	1821	mov byte ptr [BPBdl], al
[34]	1822
	1823
[51]	1824	; See if both the LVM drive-letter and the BPB drive-letter are zero.
	1825	; If so, then we have a problem.
	1826	; No valid drive-letter can be obtained and the user has to examine
	1827	; CONFIG.SYS and set that letter in the drive-letter feature
	1828	; for the partition.
	1829	mov ah,al
	1830	mov al, byte ptr [LVMdl]
	1831	or al,ah
	1832	jz no_valid_boot_drive_letter_found
	1833
	1834
	1835	; See if both the LVM drive-letter and the BPB drive-letter are
	1836	; the same. In that case we should have a valid situation and no
	1837	; adjustments need to be made.
	1838	cmp al,ah
	1839	jz PSP_valid_boot_drive
	1840
	1841
[34]	1842	;
[51]	1843	; Ok, at least one of them is valid.
[34]	1844	;
	1845
[51]	1846	; See if the BPB boot-drive-letter is valid
[67]	1847	; This one is supposed not to change since OS/2 cannot be booted
[51]	1848	; from another drive then it was installed on.
	1849	test ah,ah
	1850	jnz BPB_boot_drive_valid
	1851
	1852	; Nope it's not.
	1853	; So we use the LVM drive-letter for the BPB boot-drive-letter.
[34]	1854	; Convert to BIOS notation ('C'+3dh=80h, 'D'->81h, etc.)
[51]	1855	; This is where the user can fix this issue by using the
	1856	; drive-letter feature.
[34]	1857	add al,3dh
[51]	1858	mov bx,[PhysDiskBpbIndex]
[67]	1859	; Advance to field for drive-letter in BIOS notation (OS/2)
[51]	1860	inc bx
	1861	; Fix the boot-drive-letter field in the BPB
	1862	mov es:[di+bx],al
[34]	1863
[51]	1864	jmp PSP_valid_boot_drive
[36]	1865
	1866	;
	1867	; OS/2 uses this field to indicate the boot-drive-letter for the system.
	1868	; It is in BIOS notation where 80h='C', 81h='D' ... 97h='Z'.
	1869	; This is the field that get's forced to a specific value when the
	1870	; drive-letter feature of AiR-BOOT is used.
	1871	; Also, this field is the culprit of AiR-BOOT v1.07 not handling it
	1872	; correctly when the system uses HPFS and this byte is zero.
[67]	1873	; This mostly involved booting older OS/2 versions on HPFS.
[36]	1874	; See issues #3067 and #3119 on http://bugs.ecomstation.nl
	1875	;
	1876
	1877
[51]	1878	;
	1879	; Here we enter when the LVM drive-letter is zero or not the same
	1880	; as the BPB boot-drive-letter.
	1881	; This can be the case when booting a hidden partition, LVM-dl = zero,
	1882	; or the LVM-dl was reassigned because another system with the same
	1883	; drive-letter was booted previously.
	1884	; In any case, we set the LVM drive-letter to the BPB boot-drive-letter
	1885	; so the system can be booted.
	1886	; Driveletters on other partitions have already been reassigned by the
	1887	; reassignement-procedure earlier.
	1888	;
	1889	BPB_boot_drive_valid:
	1890
	1891
	1892
	1893
	1894	;
	1895	; ALWAYS SET LVM to BPB
	1896	;
	1897	;~ mov dl,byte ptr [si+LocIPT_Drive]
	1898	;~ mov cx,[si+LocIPT_AbsoluteBegin+00h]
	1899	;~ mov bx,[si+LocIPT_AbsoluteBegin+02h]
	1900	;~ mov al,[BPBdl]
	1901	;~ sub al,3dh
[156]	1902	;~ call LVM_SetDriveLetter ; !! NOT IMPLEMENTED !!
[51]	1903
	1904
[155]	1905	;!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
[51]	1906	;
	1907	; ALWAYS SET BPB to LVM
	1908	;
[155]	1909	mov dl, byte ptr [si+LocIPT_Drive]
	1910	mov cx, [si+LocIPT_AbsoluteBegin+00h]
	1911	mov bx, [si+LocIPT_AbsoluteBegin+02h]
	1912
	1913	; Now uses SI, not DL,CX,BX
	1914	call LVM_GetDriveLetter
	1915	;//! CHECKME: No test on LVM info found
	1916
	1917	add al, 3dh
	1918	mov bx, [PhysDiskBpbIndex]
[34]	1919	inc bx
[155]	1920	mov es:[di+bx], al
[34]	1921
	1922
[51]	1923	update_PBR:
[34]	1924
	1925
[51]	1926
	1927	;
	1928	; Here both the boot-drive-letter and the LVM drive-letter are zero.
	1929	; So the only way to determine the drive-letter is to examine CONFIG.SYS.
	1930	; Then force that drive-letter in the drive-letter feature.
	1931	no_valid_boot_drive_letter_found:
[36]	1932	; HERE SHOULD COME AN ERROR POP-UP ABOUT NO BOOT-DRIVE OR NO LVM-INFO.
[67]	1933	; WE CONTINUE BOOTING BUT OS/2 WILL MOST PROBABLY FAIL TO BOOT.
[34]	1934
[52]	1935	; FIXME: Issue some kind of warning
[67]	1936
[36]	1937	;mov ah,07h
	1938	;mov si,offset CheckID_MBR
	1939	;call VideoIO_Print
[34]	1940
	1941	hang:
[36]	1942	;jmp hang
[34]	1943
	1944
[51]	1945
	1946
	1947	PSP_valid_boot_drive:
	1948
	1949
	1950
	1951
[36]	1952	;
	1953	; Boot DriveLetter OK.
	1954	;
[34]	1955	bdl_ok:
	1956
	1957
[51]	1958	IFDEF AUX_DEBUG
[123]	1959	IF 0
[117]	1960	pushf
	1961	pusha
	1962	call AuxIO_TeletypeNL
	1963	mov bx, [PhysDiskBpbIndex]
	1964	inc bx
	1965	mov al, [di+bx]
	1966	call AuxIO_TeletypeHexByte
	1967	mov bl,[BootPartNo]
	1968	mov al, [DriveLetters+bx]
	1969	call AuxIO_TeletypeHexByte
	1970	mov al, [PartitionVolumeLetters+bx]
	1971	add al, 3dh
	1972	call AuxIO_TeletypeHexByte
	1973	mov al, [LVMdl]
	1974	add al, 3dh
	1975	call AuxIO_TeletypeHexByte
	1976	mov al, [si+LocIPT_SystemID]
	1977	call AuxIO_TeletypeHexByte
	1978	mov al,[FSType]
	1979	call AuxIO_TeletypeHexByte
	1980	popa
	1981	popf
	1982	ENDIF
[51]	1983	ENDIF
	1984
[36]	1985	;
	1986	; If the partition getting booted is a JFS partition then write-back
	1987	; the modified PBR to the disk.
	1988	; Note that it's not the in-memory PBR that get's written back, but
	1989	; a copy of the original where only the phys-disk and boot-drive-letter
	1990	; are adjusted.
	1991	;
	1992	pusha
	1993	mov al,[FSType]
	1994	cmp al,04h ; JFS
[51]	1995	je write_back_pbr
	1996	cmp al,02h ; HPFS
	1997	je write_back_pbr
[34]	1998
[51]	1999	jmp no_jfs_pbr
	2000
	2001
	2002	write_back_pbr:
	2003
[36]	2004	; Save IPT pointer
	2005	push si
[34]	2006
[36]	2007	; Copy the boot-drive and boot-drive-letter fields.
[51]	2008	mov si,offset [PartitionSector]
	2009	mov di,offset [PBRSector]
[36]	2010	mov al,[si+24h]
	2011	mov [di+24h],al
	2012	mov al,[si+25h]
	2013	mov [di+25h],al
[34]	2014
[36]	2015	; Restore IPT pointer
	2016	pop si
[34]	2017
[67]	2018
[52]	2019	; BOOKMARK: Update the CRC of the Partition Boot Record.
[53]	2020	mov bx, offset [PBRSector]
	2021	call PART_UpdateBootRecordCRC
	2022	call DriveIO_SaveConfiguration
[52]	2023
[67]	2024
[36]	2025	; Setup the registers for the partition location.
	2026	mov ax, wptr [si+LocIPT_AbsoluteBegin+0]
	2027	mov bx, wptr [si+LocIPT_AbsoluteBegin+2]
	2028	mov cx, [si+LocIPT_LocationBegin+1]
	2029	mov dh, [si+LocIPT_LocationBegin+0]
	2030	mov dl, [si+LocIPT_Drive]
[34]	2031
[67]	2032
[52]	2033	; BOOKMARK: Write the adjusted HPFS/JFS PBR to disk.
[51]	2034	mov si, offset [PBRSector]
[36]	2035	call DriveIO_SaveSector
[34]	2036
[36]	2037	no_jfs_pbr:
	2038	popa
[34]	2039
	2040
	2041
[36]	2042	; ----------------------------------------------- LOGICAL PARTITION SUPPORT
[31]	2043
[8]	2044
[31]	2045
[51]	2046	; AiR-BOOT now works around it by using the LVM-info (DLAT) of
	2047	; the partiton if present.
	2048	; Note however that if the drive-letter feature is active,
	2049	; this will override AB's automatic fixing.
	2050	;
	2051	; Test if the drive-letter feature is active for this partition.
	2052	; If so, then the drive that the user defined will be placed at
	2053	; byte 25h (37d) of the in-ram PartitionSector (BPB).
	2054	; (BIOS 80h notation: 80h=C, 81h=D, etc.)
	2055	; This is a remedy for when the corresponding field (25h) in the BPB on
	2056	; disk is zero.
	2057	;
[31]	2058
	2059
	2060
[36]	2061	;
	2062	; Control is transferred to this point if we are booting IBM-BM.
	2063	; IBM-BM does not need the BPB fixes.
	2064	; It does require a other special stuff, which is already taken care of.
	2065	;
	2066	chainload_ibm_bm:
[30]	2067
[36]	2068	;
	2069	; Control is transferred to this point if we are booting a floppy.
	2070	; Booting from floppy skips all the harddisk related stuff.
	2071	; This is a dirty hack to fix the boot from floppy feature.
	2072	;
	2073	boot_from_floppy:
[30]	2074
[52]	2075
	2076
[67]	2077
[32]	2078	;
[52]	2079	; Here we copy the prepared boot-record to 0000:7C00h
[32]	2080	; to give it control later on.
[34]	2081	;
[36]	2082	push es
[32]	2083	push si
	2084	mov ax, StartBaseSeg
	2085	mov es, ax
	2086	mov cx, 256
	2087	mov si, offset PartitionSector
	2088	mov di, StartBasePtr
[36]	2089	cld
[32]	2090	rep movsw
	2091	pop si
[36]	2092	pop es
[32]	2093
	2094	; --------------------------------------------------- NOW START BOOT-RECORD
	2095
	2096
	2097
	2098
[117]	2099	IFDEF AUX_DEBUG
	2100	IF 1
	2101	pushf
[51]	2102	pusha
[117]	2103	call DEBUG_Dump2
	2104	;~ call DEBUG_DumpBSSSectors
	2105	call DEBUG_DumpDriveLetters
	2106	call DEBUG_DumpVolumeLetters
	2107	call AuxIO_TeletypeNL
[51]	2108	popa
[117]	2109	popf
	2110	ENDIF
	2111	ENDIF
[30]	2112
	2113
	2114
[31]	2115	;
	2116	; ################################## BYE BYE ##################################
	2117	;
[30]	2118
[51]	2119	IFNDEF AUX_DEBUG
	2120	; Skip wait-for-key
	2121	jmp StartPBR
	2122	ENDIF
[36]	2123
[32]	2124	;
	2125	; Wait for keypress
	2126	;
	2127	xor ax, ax
	2128	int 16h
[30]	2129
[32]	2130	; Is escape-key ?
	2131	cmp al, 1bh
[30]	2132
[32]	2133	; Nope, Go activate PBR loader
[51]	2134	jne StartPBR
[30]	2135
[36]	2136	;push ds
	2137	;pop es
	2138
[51]	2139	; Yep, restart AiR-BOOT so simulate load DX:BX with old BIOS SS:SP
	2140	jmp AirbootRestart
	2141
[32]	2142	; Yep, Reenter bootmenu
[51]	2143	;~ jmp MBR_Main_ReEnterBootMenuPre
[30]	2144
	2145
	2146
[31]	2147	;
	2148	; Transfer control to the PBR
	2149	;
[51]	2150	StartPBR:
[30]	2151
[36]	2152	; Debug display index
	2153	;pusha
	2154	;mov al, cs:[si+LocIPT_Drive] ; Drive Physical No
	2155	;mov ah, cs:[si+LocIPT_SystemID] ; SystemID
	2156	;call VideoIO_PrintHexWord
	2157	;xor ax, ax
	2158	;int 16h
	2159	;popa
	2160
[40]	2161	;~ jmp skip_delay
[36]	2162
[40]	2163
	2164	;
[51]	2165	; Show dot's to indicate something is happening...
[40]	2166	;
[51]	2167	call VideoIO_ShowWaitDots
[40]	2168
	2169	;
	2170	; Enter here to skip delay.
	2171	;
	2172	skip_delay:
	2173
	2174
	2175
[51]	2176
[32]	2177	;
[51]	2178	; BYE BYE (prepare some registers? look at other MBR-code)
[32]	2179	;
	2180	xor ax, ax
	2181	xor bx, bx
	2182	xor cx, cx
	2183	mov ds, ax
[36]	2184	mov es, ax
	2185	xor dh, dh
[32]	2186	mov dl, cs:[si+LocIPT_Drive] ; Drive Physical No
[30]	2187
[36]	2188
[52]	2189	; BOOKMARK: JUMP TO PBR CODE
[51]	2190	; ###############################
	2191	; # JUMP TO THE PBR LOADER CODE #
	2192	; ###############################
[76]	2193	db 0EAh
	2194	dw StartBasePtr
	2195	dw StartBaseSeg
[8]	2196
[30]	2197
[31]	2198	PART_StartPartition EndP
[30]	2199
	2200
[45]	2201
	2202
	2203
[51]	2204
	2205
	2206
[45]	2207	;
[32]	2208	; ######################################
	2209	; # Is this a primary partition or not #
	2210	; ######################################
	2211	;
	2212	; In
	2213	; --
	2214	; DL = Physical Disk
	2215	; BX:CX = LBA sector
	2216	;
	2217	; Out
	2218	; ---
	2219	; AX = Index in PT if found, otherwise -1
	2220	; CY = Set if Primary, clear if not
	2221	;
	2222	PART_IsPrimaryPartition Proc Near Uses bx cx dx si di ds es
[111]	2223
	2224	IFDEF AUX_DEBUG
	2225	IF 0
[123]	2226	DBG_TEXT_OUT_AUX 'PART_IsPrimaryPartition:'
	2227	PUSHRF
[111]	2228	;~ call DEBUG_DumpRegisters
	2229	;~ call AuxIO_DumpParagraph
	2230	;~ call AuxIO_TeletypeNL
[123]	2231	POPRF
[111]	2232	ENDIF
	2233	ENDIF
	2234
[32]	2235	; Push LBA address of partition
	2236	push bx
	2237	push cx
	2238
	2239	; Load LBA sector 0 from the disk specified in DL
	2240	xor bx,bx
[118]	2241	xor ax,ax
[32]	2242	mov di,ds
	2243	mov si,offset [TmpSector]
[102]	2244	call DriveIO_ReadSectorLBA
[32]	2245
	2246	; Restore partitions LBA address to DI:SI
	2247	pop si
	2248	pop di
	2249
	2250	; Return with index -1 and CY clear if there was an
	2251	; error loading the sector.
	2252	mov ax,-1
	2253	cmc
	2254	jnc PART_IsPrimaryPartition_exit
	2255
	2256	; Compare the partition address with each entry in the P-table
	2257	mov cx,4 ; Nr. of PT-entries
	2258	mov dx,offset [TmpSector]
	2259	add dx,01beh+08h ; Point DX to 1st partition address
	2260
	2261	next_pe:
[73]	2262	; Compute pointer to PE
[32]	2263	mov bx,dx ; Point BX to 1st partition address
	2264	mov ax,cx ; Get PE-index
	2265	dec ax ; Index is zero based so adjust it
	2266	shl ax,4 ; PE's are 16 bytes in size
	2267	add bx,ax ; Make BX point to the PE
	2268
	2269	; Compare LBA address
	2270	push si
	2271	push di
	2272	xor si,[bx+00h] ; Will put 0 in SI if the same
	2273	xor di,[bx+02h] ; Will put 0 in DI if the same
	2274	or si,di ; Wil set ZF if both zero
	2275	pop di
	2276	pop si
	2277	loopnz next_pe ; Try next entry if non-zero
	2278
	2279	; Partition found or counter exhausted
	2280	mov ax,-1
	2281	clc
	2282	; Not found, so exit with NC and invalid index
	2283	jnz PART_IsPrimaryPartition_exit
	2284
	2285	; Partition is Primary, set CY and return index
	2286	mov ax,cx
	2287	stc
	2288
	2289	PART_IsPrimaryPartition_exit:
	2290	ret
	2291	PART_IsPrimaryPartition Endp
	2292
	2293
	2294
	2295	;
	2296	; #############################
	2297	; # Is this an HPFS partition #
	2298	; #############################
	2299	;
	2300	; In
	2301	; --
[51]	2302	; SI = Pointer to IPT entry
[32]	2303	;
	2304	; Out
	2305	; ---
[34]	2306	; CY = Set if HPFS partition, clear if not
[32]	2307	;
[51]	2308	PART_IsHPFS Proc Near Uses ax
	2309	mov al, [si+LocIPT_SystemID] ; Get SystemID
	2310	cmp al, 07h ; Compare with AiR-BOOT ID for HPFS
	2311	stc ; Assume HPFS
	2312	je PART_IsHPFS_exit ; Yep
	2313	clc ; Nope, clear CY
[32]	2314	PART_IsHPFS_exit:
	2315	ret
	2316	PART_IsHPFS Endp
	2317
	2318
	2319	;
[34]	2320	; ###########################
[32]	2321	; # Is this a JFS partition #
[34]	2322	; ###########################
[32]	2323	;
	2324	; In
	2325	; --
[51]	2326	; SI = Pointer to IPT entry
[32]	2327	;
	2328	; Out
	2329	; ---
	2330	; CY = Set if JFS partition, clear if not
	2331	;
[51]	2332	PART_IsJFS Proc Near Uses ax
	2333	mov al, [si+LocIPT_SystemID] ; Get SystemID
	2334	cmp al, 0fch ; Compare with AiR-BOOT ID for JFS
	2335	stc ; Assume JFS
	2336	je PART_IsJFS_exit ; Yep
	2337	clc ; Nope, clear CY
[32]	2338	PART_IsJFS_exit:
	2339	ret
	2340	PART_IsJFS Endp
	2341
[34]	2342
	2343
[32]	2344	;
[51]	2345	; #############################
	2346	; # Is this an NTFS partition #
	2347	; #############################
	2348	;
	2349	; In
	2350	; --
	2351	; SI = Pointer to IPT entry
	2352	;
	2353	; Out
	2354	; ---
	2355	; CY = Set if NTFS partition, clear if not
	2356	;
	2357	PART_IsNTFS Proc Near Uses ax
	2358	mov al, [si+LocIPT_SystemID] ; Get SystemID
	2359	cmp al, 08h ; Compare with AiR-BOOT ID for NTFS
	2360	stc ; Assume NTFS
	2361	je PART_IsNTFS_exit ; Yep
	2362	clc ; Nope, clear CY
	2363	PART_IsNTFS_exit:
	2364	ret
	2365	PART_IsNTFS Endp
	2366
	2367
	2368	;
[34]	2369	; ######################################
	2370	; # Is this a FAT12 or FAT16 partition #
	2371	; ######################################
	2372	;
	2373	; In
	2374	; --
[51]	2375	; SI = Pointer to IPT entry
[34]	2376	;
	2377	; Out
	2378	; ---
	2379	; CY = Set if FAT12 or FAT16 partition, clear if not
	2380	;
[51]	2381	PART_IsFAT Proc Near Uses ax
	2382	mov al, [si+LocIPT_SystemID] ; Get SystemID
	2383	cmp al, 04h ; Is FAT12 ?
[34]	2384	stc
[51]	2385	je PART_IsFAT_exit ; Yep
	2386	cmp al, 06h ; Is FAT16 CHS ?
	2387	stc
	2388	je PART_IsFAT_exit ; Yep
	2389	cmp al, 0eh ; Is FAT16 LBA ?
	2390	stc
	2391	je PART_IsFAT_exit ; Yep
	2392	clc ; Nope
[34]	2393	PART_IsFAT_exit:
	2394	ret
	2395	PART_IsFAT Endp
	2396
	2397
	2398	;
[32]	2399	; #############################
	2400	; # Is this a FAT32 partition #
	2401	; #############################
	2402	;
	2403	; In
	2404	; --
[51]	2405	; SI = Pointer to IPT entry
[32]	2406	;
	2407	; Out
	2408	; ---
	2409	; CY = Set if FAT32 partition, clear if not
	2410	;
[51]	2411	PART_IsFAT32 Proc Near Uses ax
	2412	mov al, [si+LocIPT_SystemID] ; Get SystemID
	2413	cmp al, 0bh ; Is FAT32 CHS ?
[32]	2414	stc
[51]	2415	je PART_IsFAT32_exit ; Yep
	2416	cmp al, 0ch ; Is FAT32 LBA ?
	2417	stc
	2418	je PART_IsFAT32_exit ; Yep
	2419	clc ; Nope
[32]	2420	PART_IsFAT32_exit:
	2421	ret
	2422	PART_IsFAT32 Endp
	2423
	2424
	2425
	2426	;
	2427	; ##############################################################
	2428	; # Does this partition have the Windows BootManager installed #
	2429	; ##############################################################
	2430	;
	2431	; In
	2432	; --
	2433	; DL = Physical Disk
	2434	; BX:CX = LBA sector
	2435	;
	2436	; Out
	2437	; ---
	2438	; CY = Set if BOOTMGR found, clear if not
	2439	;
[40]	2440	;PART_IsWinBMGR Proc Near Uses ax bx cx dx si di ds es
	2441	;
	2442	; ; Load specified LBA sector (BX:CX) from the disk in DL
	2443	; mov di,ds
	2444	; mov si,offset [TmpSector]
[118]	2445	; mov ax, cx ; LBA low is now in AX
[102]	2446	; call DriveIO_ReadSectorLBA
[32]	2447
[40]	2448	; ; Point to location of 'BOOTMGR' signature.
	2449	; add si,169h
[32]	2450
[40]	2451	; ; DL holds equality status
	2452	; xor dl,dl
	2453	; cld
[32]	2454
[40]	2455	; ; Load letter into AL, xor with letter will result 0 if the same.
	2456	; ; Then or to DL.
	2457	; ; If at the end of the sequence DL is zero, the signature is present.
	2458	; lodsb
	2459	; xor al,'B'
	2460	; or dl,al
	2461	; lodsb
	2462	; xor al,'O'
	2463	; or dl,al
	2464	; lodsb
	2465	; xor al,'O'
	2466	; or dl,al
	2467	; lodsb
	2468	; xor al,'T'
	2469	; or dl,al
	2470	; lodsb
	2471	; xor al,'M'
	2472	; or dl,al
	2473	; lodsb
	2474	; xor al,'G'
	2475	; or dl,al
	2476	; lodsb
	2477	; xor al,'R'
	2478	; or dl,al
[32]	2479
[40]	2480	; ; Assume not present
	2481	; clc
	2482	; jnz PART_IsWinBMGR_exit
[32]	2483
[40]	2484	; ; BOOTMGR signature found
	2485	; stc
[32]	2486
[40]	2487	; PART_IsWinBMGR_exit:
	2488	; ret
	2489	;PART_IsWinBMGR Endp
[32]	2490
[34]	2491
	2492	;
	2493	; ##########################################################
	2494	; # Get the offset of the phys-disk field in the PBR (BPB) #
	2495	; ##########################################################
	2496	;
	2497	; In
	2498	; --
	2499	; DS:SI = IPT
	2500	;
	2501	; Out
	2502	; ---
	2503	; AX = Index in PBR for phys-disk field
	2504	;
	2505	PART_GetFieldIndex Proc Near uses bx cx dx
	2506	; Check for FAT32 partition
	2507	mov dl,bptr [si+LocIPT_Drive]
	2508	mov cx,[si+LocIPT_AbsoluteBegin+00h]
	2509	mov bx,[si+LocIPT_AbsoluteBegin+02h]
	2510	call PART_IsFAT32
	2511	mov ax,24h ; Offset in old-style BPB
	2512	jnc PART_GetFieldIndex_exit
	2513	mov ax,40h ; Offset in FAT32 BPB
	2514	PART_GetFieldIndex_exit:
	2515	ret
	2516	PART_GetFieldIndex EndP

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source: trunk/bootcode/regular/partmain.asm

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