WebSVN – Kolibri OS – Blame – /kernel/trunk/fs/part_set.inc

Rev	Author	Line No.	Line
65	mario79	1	;*************************************************************
74	mario79	2	;* 29.04.2006 Elimination of hangup after the *
		3	;* expiration hd_wait_timeout - Mario79 *
65	mario79	4	;* 28.01.2006 find all Fat16/32 partition in all input point *
		5	;* to MBR - Mario79 *
		6	;*************************************************************
		7
277	diamond	8	uglobal
65	mario79	9	align 4
256	diamond	10
65	mario79	11	;******************************************************
		12	; Please do not change this place - variables in text
		13	; Mario79
		14	; START place
		15	;******************************************************
		16	PARTITION_START dd 0x3f
		17	PARTITION_END dd 0
256	diamond	18	fs_type db 0 ; 0=none, 1=NTFS, 16=FAT16, 32=FAT32
277	diamond	19	align 4
256	diamond	20
		21	fs_dependent_data_start:
		22	; FATxx data
		23
65	mario79	24	SECTORS_PER_FAT dd 0x1f3a
		25	NUMBER_OF_FATS dd 0x2
		26	SECTORS_PER_CLUSTER dd 0x8
		27	BYTES_PER_SECTOR dd 0x200 ; Note: if BPS <> 512 need lots of changes
		28	ROOT_CLUSTER dd 2 ; first rootdir cluster
		29	FAT_START dd 0 ; start of fat table
		30	ROOT_START dd 0 ; start of rootdir (only fat16)
		31	ROOT_SECTORS dd 0 ; count of rootdir sectors (only fat16)
		32	DATA_START dd 0 ; start of data area (=first cluster 2)
		33	LAST_CLUSTER dd 0 ; last availabe cluster
		34	ADR_FSINFO dd 0 ; used only by fat32
		35
		36	fatRESERVED dd 0x0FFFFFF6
		37	fatBAD dd 0x0FFFFFF7
		38	fatEND dd 0x0FFFFFF8
		39	fatMASK dd 0x0FFFFFFF
		40
256	diamond	41	fs_dependent_data_end:
321	diamond	42	file_system_data_size = $ - PARTITION_START
		43	if file_system_data_size > 96
		44	ERROR: sizeof(file system data) too big!
		45	end if
256	diamond	46
		47	virtual at fs_dependent_data_start
		48	; NTFS data
		49	ntfs_data:
		50	.sectors_per_cluster dd ?
		51	.mft_cluster dd ?
		52	.mftmirr_cluster dd ?
		53	.frs_size dd ? ; FRS size in bytes
		54	.iab_size dd ? ; IndexAllocationBuffer size in bytes
		55	.frs_buffer dd ?
		56	.iab_buffer dd ?
		57	.mft_retrieval dd ?
		58	.mft_retrieval_size dd ?
		59	.mft_retrieval_alloc dd ?
		60	.mft_retrieval_end dd ?
		61	.cur_index_size dd ?
		62	.cur_index_buf dd ?
		63	if $ > fs_dependent_data_end
		64	ERROR: increase sizeof(fs_dependent_data)!
		65	end if
		66	end virtual
		67
65	mario79	68	;***************************************************************************
		69	; End place
		70	; Mario79
		71	;***************************************************************************
277	diamond	72	endg
		73	iglobal
65	mario79	74
		75	partition_types: ; list of fat16/32 partitions
		76	db 0x04 ; DOS: fat16 <32M
		77	db 0x06 ; DOS: fat16 >32M
		78	db 0x0b ; WIN95: fat32
		79	db 0x0c ; WIN95: fat32, LBA-mapped
		80	db 0x0e ; WIN95: fat16, LBA-mapped
		81	db 0x14 ; Hidden DOS: fat16 <32M
		82	db 0x16 ; Hidden DOS: fat16 >32M
		83	db 0x1b ; Hidden WIN95: fat32
		84	db 0x1c ; Hidden WIN95: fat32, LBA-mapped
		85	db 0x1e ; Hidden WIN95: fat16, LBA-mapped
		86	db 0xc4 ; DRDOS/secured: fat16 <32M
		87	db 0xc6 ; DRDOS/secured: fat16 >32M
		88	db 0xcb ; DRDOS/secured: fat32
		89	db 0xcc ; DRDOS/secured: fat32, LBA-mapped
		90	db 0xce ; DRDOS/secured: fat16, LBA-mapped
		91	db 0xd4 ; Old Multiuser DOS secured: fat16 <32M
		92	db 0xd6 ; Old Multiuser DOS secured: fat16 >32M
256	diamond	93	db 0x07 ; NTFS
65	mario79	94	partition_types_end:
		95
		96
		97	extended_types: ; list of extended partitions
		98	db 0x05 ; DOS: extended partition
		99	db 0x0f ; WIN95: extended partition, LBA-mapped
		100	db 0xc5 ; DRDOS/secured: extended partition
		101	db 0xd5 ; Old Multiuser DOS secured: extended partition
		102	extended_types_end:
		103
		104	endg
		105
		106	; Partition chain used:
		107	; MBR ; PARTITION2 ; PARTITION3 ; PARTITION4
		108	;==========================================================
		109	; fat16/32 +-- fat16/32 +-- fat16/32 +-- fat16/32 +--
		110	; extended --+ extended --+ extended --+ extended --+
		111	; 0 0 0 0
		112	; 0 0 0 0
		113	; Notes:
		114	; - extended partition need to be in second entry on table
		115	; - it will skip over removed partitions
		116
		117	set_FAT32_variables:
		118	mov [problem_partition],0
		119	call reserve_hd1
321	diamond	120	call reserve_hd_channel
65	mario79	121
		122	cmp dword [hdpos],0
		123	je problem_hd
		124
		125	pushad
		126	xor ecx,ecx ; partition count
		127	mov edx,-1 ; flag for partition
		128	xor eax,eax ; read MBR
		129	xor ebp,ebp ; extended partition start
		130
		131	new_partition:
		132	test ebp,ebp ; is there extended partition?
		133	jnz extended_already_set ; yes
		134	xchg ebp,eax ; no. set it now
		135
		136	extended_already_set:
		137	add eax,ebp ; mbr=mbr+0, ext_part=ext_start+relat_start
		138	mov ebx,buffer
		139	call hd_read
74	mario79	140	cmp [hd_error],0
		141	jne problem_hd
65	mario79	142
		143	cmp word [ebx+0x1fe],0xaa55 ; is it valid boot sector?
		144	jnz end_partition_chain
		145	cmp dword [ebx+0x1be+0xc],0 ; skip over empty partition
		146	jz next_partition
		147
		148	push eax
		149	mov al,[ebx+0x1be+4] ; get primary partition type
		150	call scan_partition_types
		151	pop eax
		152	jnz next_primary_partition ; no. skip over
		153
		154	inc ecx
		155	cmp ecx,[fat32part] ; is it wanted partition?
		156	jnz next_primary_partition ; no
		157
256	diamond	158	mov edx, eax ; start sector
		159	add edx, [ebx+0x1be+8] ; add relative start
		160	push edx
		161	add edx, [ebx+0x1be+12] ; add length
		162	dec edx ; PARTITION_END is inclusive
		163	mov [PARTITION_END], edx ; note that this can be changed
		164	; when file system data will be available
		165	mov dl, [ebx+0x1be+4]
		166	mov [fs_type], dl ; save for FS recognizer (separate FAT vs NTFS)
		167	pop edx
		168
65	mario79	169	next_primary_partition:
		170	push eax
		171	mov al,[ebx+0x1be+4+16] ; get primary partition type
		172	call scan_partition_types
		173	pop eax
		174	jnz next_primary_partition_1 ; no. skip over
		175
		176	inc ecx
		177	cmp ecx,[fat32part] ; is it wanted partition?
		178	jnz next_primary_partition_1 ; no
		179
256	diamond	180	mov edx, eax
		181	add edx, [ebx+0x1be+8+16]
		182	push edx
		183	add edx, [ebx+0x1be+12+16]
		184	dec edx
		185	mov [PARTITION_END], edx
		186	mov dl, [ebx+0x1be+4+16]
		187	mov [fs_type], dl
		188	pop edx
65	mario79	189
		190	next_primary_partition_1:
		191	push eax
		192	mov al,[ebx+0x1be+4+16+16] ; get primary partition type
		193	call scan_partition_types
		194	pop eax
		195	jnz next_primary_partition_2 ; no. skip over
		196
		197	inc ecx
		198	cmp ecx,[fat32part] ; is it wanted partition?
		199	jnz next_primary_partition_2 ; no
		200
256	diamond	201	mov edx, eax
		202	add edx, [ebx+0x1be+8+16+16]
		203	push edx
		204	add edx, [ebx+0x1be+12+16+16]
		205	dec edx
		206	mov [PARTITION_END], edx
		207	mov dl, [ebx+0x1be+4+16+16]
		208	mov [fs_type], dl
		209	pop edx
65	mario79	210
		211	next_primary_partition_2:
		212	push eax
		213	mov al,[ebx+0x1be+4+16+16+16] ; get primary partition type
		214	call scan_partition_types
		215	pop eax
		216	jnz next_partition ; no. skip over
		217
		218	inc ecx
		219	cmp ecx,[fat32part] ; is it wanted partition?
		220	jnz next_partition ; no
		221
256	diamond	222	mov edx, eax
		223	add edx, [ebx+0x1be+8+16+16+16]
		224	push edx
		225	add edx, [ebx+0x1be+12+16+16+16]
		226	dec edx
		227	mov [PARTITION_END], edx
		228	mov dl, [ebx+0x1be+4+16+16+16]
		229	mov [fs_type], dl
		230	pop edx
65	mario79	231
		232	next_partition:
		233	push eax
		234	mov al,[ebx+0x1be+4] ; get extended partition type
		235	call scan_extended_types
		236	pop eax
		237	jnz next_partition_1
		238
		239	mov eax,[ebx+0x1be+8] ; add relative start
		240	test eax,eax ; is there extended partition?
		241	jnz new_partition ; yes. read it
		242
		243	next_partition_1:
		244	push eax
		245	mov al,[ebx+0x1be+4+16] ; get extended partition type
		246	call scan_extended_types
		247	pop eax
		248	jnz next_partition_2
		249
		250	mov eax,[ebx+0x1be+8+16] ; add relative start
		251	test eax,eax ; is there extended partition?
		252	jnz new_partition ; yes. read it
		253
		254	next_partition_2:
		255	push eax
		256	mov al,[ebx+0x1be+4+16+16] ; get extended partition type
		257	call scan_extended_types
		258	pop eax
		259	jnz next_partition_3
		260
		261	mov eax,[ebx+0x1be+8+16+16] ; add relative start
		262	test eax,eax ; is there extended partition?
		263	jnz new_partition ; yes. read it
		264
		265	next_partition_3:
		266	push eax
		267	mov al,[ebx+0x1be+4+16+16+16] ; get extended partition type
		268	call scan_extended_types
		269	pop eax
		270	jnz end_partition_chain ; no. end chain
		271
		272	mov eax,[ebx+0x1be+8+16+16+16] ; get start of extended partition
		273	test eax,eax ; is there extended partition?
		274	jnz new_partition ; yes. read it
		275
		276	end_partition_chain:
		277	mov [partition_count],ecx
		278
		279	cmp edx,-1 ; found wanted partition?
		280	jnz hd_and_partition_ok ; yes. install it
		281	jmp problem_partition_or_fat
		282
		283	scan_partition_types:
		284	push ecx
		285	mov edi,partition_types
		286	mov ecx,partition_types_end-partition_types
		287	cld
		288	repne scasb ; is partition type ok?
		289	pop ecx
		290	ret
		291
		292	scan_extended_types:
		293	push ecx
		294	mov edi,extended_types
		295	mov ecx,extended_types_end-extended_types
		296	cld
		297	repne scasb ; is it extended partition?
		298	pop ecx
		299	ret
		300
		301	problem_fat_dec_count: ; bootsector is missing or another problem
		302	dec [partition_count] ; remove it from partition_count
		303
		304	problem_partition_or_fat:
		305	popad
		306
		307	problem_hd:
256	diamond	308	mov [fs_type],0
321	diamond	309	call free_hd_channel
65	mario79	310	mov [hd1_status],0 ; free
		311	mov [problem_partition],1
		312	ret
		313
		314	hd_and_partition_ok:
		315	mov eax,edx
		316	mov [PARTITION_START],eax
256	diamond	317	mov edx, [PARTITION_END]
		318	sub edx, eax
		319	inc edx ; edx = length of partition
65	mario79	320
256	diamond	321	; mov [hd_setup],1
65	mario79	322	mov ebx,buffer
		323	call hd_read ; read boot sector of partition
256	diamond	324	cmp [hd_error], 0
		325	jz boot_read_ok
		326	cmp [fs_type], 7
		327	jnz problem_fat_dec_count
		328	; NTFS duplicates bootsector:
		329	; NT4/2k/XP+ saves bootsector copy in the end of disk
		330	; NT 3.51 saves bootsector copy in the middle of disk
		331	and [hd_error], 0
		332	mov eax, [PARTITION_END]
		333	call hd_read
		334	cmp [hd_error], 0
		335	jnz @f
		336	call ntfs_test_bootsec
		337	jnc boot_read_ok
		338	@@:
		339	and [hd_error], 0
		340	mov eax, edx
		341	shr eax, 1
		342	add eax, [PARTITION_START]
		343	call hd_read
		344	cmp [hd_error], 0
		345	jnz problem_fat_dec_count ; �� 졠...
		346	boot_read_ok:
		347	; mov [hd_setup], 0
		348	; if we are running on NTFS, check bootsector
		349	cmp [fs_type], 7
		350	jz ntfs_setup
74	mario79	351
65	mario79	352	cmp word [ebx+0x1fe],0xaa55 ; is it valid boot sector?
		353	jnz problem_fat_dec_count
		354
		355	movzx eax,word [ebx+0xe] ; sectors reserved
		356	add eax,[PARTITION_START]
		357	mov [FAT_START],eax ; fat_start = partition_start + reserved
		358
		359	movzx eax,byte [ebx+0xd] ; sectors per cluster
		360	mov [SECTORS_PER_CLUSTER],eax
		361
		362	movzx ecx,word [ebx+0xb] ; bytes per sector
		363	mov [BYTES_PER_SECTOR],ecx
		364
		365	movzx eax,word [ebx+0x11] ; count of rootdir entries (=0 fat32)
		366	mov edx,32
		367	mul edx
		368	dec ecx
		369	add eax,ecx ; round up if not equal count
		370	inc ecx ; bytes per sector
		371	div ecx
		372	mov [ROOT_SECTORS],eax ; count of rootdir sectors
		373
		374	movzx eax,word [ebx+0x16] ; sectors per fat <65536
		375	test eax,eax
		376	jnz fat16_fatsize
		377	mov eax,[ebx+0x24] ; sectors per fat
		378	fat16_fatsize:
		379	mov [SECTORS_PER_FAT],eax
		380
		381	movzx eax,byte [ebx+0x10] ; number of fats
		382	test eax,eax ; if 0 it's not fat partition
		383	jz problem_fat_dec_count
		384	mov [NUMBER_OF_FATS],eax
		385	imul eax,[SECTORS_PER_FAT]
		386	add eax,[FAT_START]
		387	mov [ROOT_START],eax ; rootdir = fat_start + fat_size * fat_count
		388	add eax,[ROOT_SECTORS] ; rootdir sectors should be 0 on fat32
		389	mov [DATA_START],eax ; data area = rootdir + rootdir_size
		390
		391	movzx eax,word [ebx+0x13] ; total sector count <65536
		392	test eax,eax
		393	jnz fat16_total
		394	mov eax,[ebx+0x20] ; total sector count
		395	fat16_total:
		396	add eax,[PARTITION_START]
		397	dec eax
		398	mov [PARTITION_END],eax
		399	inc eax
		400	sub eax,[DATA_START] ; eax = count of data sectors
		401	xor edx,edx
		402	div dword [SECTORS_PER_CLUSTER]
		403	inc eax
		404	mov [LAST_CLUSTER],eax
		405	dec eax ; cluster count
		406
		407	; limits by Microsoft Hardware White Paper v1.03
		408	cmp eax,4085 ; 0xff5
		409	jb problem_fat_dec_count ; fat12 not supported
		410	cmp eax,65525 ; 0xfff5
		411	jb fat16_partition
		412
		413	fat32_partition:
		414	mov eax,[ebx+0x2c] ; rootdir cluster
		415	mov [ROOT_CLUSTER],eax
		416	movzx eax,word [ebx+0x30] ; fs info sector
		417	add eax,[PARTITION_START]
		418	mov [ADR_FSINFO],eax
		419
		420	popad
		421
		422	mov [fatRESERVED],0x0FFFFFF6
		423	mov [fatBAD],0x0FFFFFF7
		424	mov [fatEND],0x0FFFFFF8
		425	mov [fatMASK],0x0FFFFFFF
256	diamond	426	mov [fs_type],32 ; Fat32
321	diamond	427	call free_hd_channel
65	mario79	428	mov [hd1_status],0 ; free
		429	ret
		430
		431	fat16_partition:
		432	xor eax,eax
		433	mov [ROOT_CLUSTER],eax
		434
		435	popad
		436
		437	mov [fatRESERVED],0x0000FFF6
		438	mov [fatBAD],0x0000FFF7
		439	mov [fatEND],0x0000FFF8
		440	mov [fatMASK],0x0000FFFF
256	diamond	441	mov [fs_type],16 ; Fat16
321	diamond	442	call free_hd_channel
65	mario79	443	mov [hd1_status],0 ; free
		444	ret

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