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
		8	align 4
256	diamond	9
		10	iglobal
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
		19
		20	fs_dependent_data_start:
		21	; FATxx data
		22
65	mario79	23	SECTORS_PER_FAT dd 0x1f3a
		24	NUMBER_OF_FATS dd 0x2
		25	SECTORS_PER_CLUSTER dd 0x8
		26	BYTES_PER_SECTOR dd 0x200 ; Note: if BPS <> 512 need lots of changes
		27	ROOT_CLUSTER dd 2 ; first rootdir cluster
		28	FAT_START dd 0 ; start of fat table
		29	ROOT_START dd 0 ; start of rootdir (only fat16)
		30	ROOT_SECTORS dd 0 ; count of rootdir sectors (only fat16)
		31	DATA_START dd 0 ; start of data area (=first cluster 2)
		32	LAST_CLUSTER dd 0 ; last availabe cluster
		33	ADR_FSINFO dd 0 ; used only by fat32
		34
		35	fatRESERVED dd 0x0FFFFFF6
		36	fatBAD dd 0x0FFFFFF7
		37	fatEND dd 0x0FFFFFF8
		38	fatMASK dd 0x0FFFFFFF
		39
256	diamond	40	fs_dependent_data_end:
		41
		42	virtual at fs_dependent_data_start
		43	; NTFS data
		44	ntfs_data:
		45	.sectors_per_cluster dd ?
		46	.mft_cluster dd ?
		47	.mftmirr_cluster dd ?
		48	.frs_size dd ? ; FRS size in bytes
		49	.iab_size dd ? ; IndexAllocationBuffer size in bytes
		50	.frs_buffer dd ?
		51	.iab_buffer dd ?
		52	.mft_retrieval dd ?
		53	.mft_retrieval_size dd ?
		54	.mft_retrieval_alloc dd ?
		55	.mft_retrieval_end dd ?
		56	.cur_index_size dd ?
		57	.cur_index_buf dd ?
		58	if $ > fs_dependent_data_end
		59	ERROR: increase sizeof(fs_dependent_data)!
		60	end if
		61	end virtual
		62
65	mario79	63	;***************************************************************************
		64	; End place
		65	; Mario79
		66	;***************************************************************************
		67
		68	partition_types: ; list of fat16/32 partitions
		69	db 0x04 ; DOS: fat16 <32M
		70	db 0x06 ; DOS: fat16 >32M
		71	db 0x0b ; WIN95: fat32
		72	db 0x0c ; WIN95: fat32, LBA-mapped
		73	db 0x0e ; WIN95: fat16, LBA-mapped
		74	db 0x14 ; Hidden DOS: fat16 <32M
		75	db 0x16 ; Hidden DOS: fat16 >32M
		76	db 0x1b ; Hidden WIN95: fat32
		77	db 0x1c ; Hidden WIN95: fat32, LBA-mapped
		78	db 0x1e ; Hidden WIN95: fat16, LBA-mapped
		79	db 0xc4 ; DRDOS/secured: fat16 <32M
		80	db 0xc6 ; DRDOS/secured: fat16 >32M
		81	db 0xcb ; DRDOS/secured: fat32
		82	db 0xcc ; DRDOS/secured: fat32, LBA-mapped
		83	db 0xce ; DRDOS/secured: fat16, LBA-mapped
		84	db 0xd4 ; Old Multiuser DOS secured: fat16 <32M
		85	db 0xd6 ; Old Multiuser DOS secured: fat16 >32M
256	diamond	86	db 0x07 ; NTFS
65	mario79	87	partition_types_end:
		88
		89
		90	extended_types: ; list of extended partitions
		91	db 0x05 ; DOS: extended partition
		92	db 0x0f ; WIN95: extended partition, LBA-mapped
		93	db 0xc5 ; DRDOS/secured: extended partition
		94	db 0xd5 ; Old Multiuser DOS secured: extended partition
		95	extended_types_end:
		96
		97	endg
		98
		99	; Partition chain used:
		100	; MBR ; PARTITION2 ; PARTITION3 ; PARTITION4
		101	;==========================================================
		102	; fat16/32 +-- fat16/32 +-- fat16/32 +-- fat16/32 +--
		103	; extended --+ extended --+ extended --+ extended --+
		104	; 0 0 0 0
		105	; 0 0 0 0
		106	; Notes:
		107	; - extended partition need to be in second entry on table
		108	; - it will skip over removed partitions
		109
		110	set_FAT32_variables:
		111	mov [0xfe10],dword 0 ; entries in hd cache
		112	mov [problem_partition],0
		113	call reserve_hd1
		114	call clear_hd_cache
		115
		116	cmp dword [hdpos],0
		117	je problem_hd
		118
		119	pushad
		120	xor ecx,ecx ; partition count
		121	mov edx,-1 ; flag for partition
		122	xor eax,eax ; read MBR
		123	xor ebp,ebp ; extended partition start
		124
		125	new_partition:
		126	test ebp,ebp ; is there extended partition?
		127	jnz extended_already_set ; yes
		128	xchg ebp,eax ; no. set it now
		129
		130	extended_already_set:
		131	add eax,ebp ; mbr=mbr+0, ext_part=ext_start+relat_start
		132	mov ebx,buffer
		133	call hd_read
74	mario79	134	cmp [hd_error],0
		135	jne problem_hd
65	mario79	136
		137	cmp word [ebx+0x1fe],0xaa55 ; is it valid boot sector?
		138	jnz end_partition_chain
		139	cmp dword [ebx+0x1be+0xc],0 ; skip over empty partition
		140	jz next_partition
		141
		142	push eax
		143	mov al,[ebx+0x1be+4] ; get primary partition type
		144	call scan_partition_types
		145	pop eax
		146	jnz next_primary_partition ; no. skip over
		147
		148	inc ecx
		149	cmp ecx,[fat32part] ; is it wanted partition?
		150	jnz next_primary_partition ; no
		151
256	diamond	152	mov edx, eax ; start sector
		153	add edx, [ebx+0x1be+8] ; add relative start
		154	push edx
		155	add edx, [ebx+0x1be+12] ; add length
		156	dec edx ; PARTITION_END is inclusive
		157	mov [PARTITION_END], edx ; note that this can be changed
		158	; when file system data will be available
		159	mov dl, [ebx+0x1be+4]
		160	mov [fs_type], dl ; save for FS recognizer (separate FAT vs NTFS)
		161	pop edx
		162
65	mario79	163	next_primary_partition:
		164	push eax
		165	mov al,[ebx+0x1be+4+16] ; get primary partition type
		166	call scan_partition_types
		167	pop eax
		168	jnz next_primary_partition_1 ; no. skip over
		169
		170	inc ecx
		171	cmp ecx,[fat32part] ; is it wanted partition?
		172	jnz next_primary_partition_1 ; no
		173
256	diamond	174	mov edx, eax
		175	add edx, [ebx+0x1be+8+16]
		176	push edx
		177	add edx, [ebx+0x1be+12+16]
		178	dec edx
		179	mov [PARTITION_END], edx
		180	mov dl, [ebx+0x1be+4+16]
		181	mov [fs_type], dl
		182	pop edx
65	mario79	183
		184	next_primary_partition_1:
		185	push eax
		186	mov al,[ebx+0x1be+4+16+16] ; get primary partition type
		187	call scan_partition_types
		188	pop eax
		189	jnz next_primary_partition_2 ; no. skip over
		190
		191	inc ecx
		192	cmp ecx,[fat32part] ; is it wanted partition?
		193	jnz next_primary_partition_2 ; no
		194
256	diamond	195	mov edx, eax
		196	add edx, [ebx+0x1be+8+16+16]
		197	push edx
		198	add edx, [ebx+0x1be+12+16+16]
		199	dec edx
		200	mov [PARTITION_END], edx
		201	mov dl, [ebx+0x1be+4+16+16]
		202	mov [fs_type], dl
		203	pop edx
65	mario79	204
		205	next_primary_partition_2:
		206	push eax
		207	mov al,[ebx+0x1be+4+16+16+16] ; get primary partition type
		208	call scan_partition_types
		209	pop eax
		210	jnz next_partition ; no. skip over
		211
		212	inc ecx
		213	cmp ecx,[fat32part] ; is it wanted partition?
		214	jnz next_partition ; no
		215
256	diamond	216	mov edx, eax
		217	add edx, [ebx+0x1be+8+16+16+16]
		218	push edx
		219	add edx, [ebx+0x1be+12+16+16+16]
		220	dec edx
		221	mov [PARTITION_END], edx
		222	mov dl, [ebx+0x1be+4+16+16+16]
		223	mov [fs_type], dl
		224	pop edx
65	mario79	225
		226	next_partition:
		227	push eax
		228	mov al,[ebx+0x1be+4] ; get extended partition type
		229	call scan_extended_types
		230	pop eax
		231	jnz next_partition_1
		232
		233	mov eax,[ebx+0x1be+8] ; add relative start
		234	test eax,eax ; is there extended partition?
		235	jnz new_partition ; yes. read it
		236
		237	next_partition_1:
		238	push eax
		239	mov al,[ebx+0x1be+4+16] ; get extended partition type
		240	call scan_extended_types
		241	pop eax
		242	jnz next_partition_2
		243
		244	mov eax,[ebx+0x1be+8+16] ; add relative start
		245	test eax,eax ; is there extended partition?
		246	jnz new_partition ; yes. read it
		247
		248	next_partition_2:
		249	push eax
		250	mov al,[ebx+0x1be+4+16+16] ; get extended partition type
		251	call scan_extended_types
		252	pop eax
		253	jnz next_partition_3
		254
		255	mov eax,[ebx+0x1be+8+16+16] ; add relative start
		256	test eax,eax ; is there extended partition?
		257	jnz new_partition ; yes. read it
		258
		259	next_partition_3:
		260	push eax
		261	mov al,[ebx+0x1be+4+16+16+16] ; get extended partition type
		262	call scan_extended_types
		263	pop eax
		264	jnz end_partition_chain ; no. end chain
		265
		266	mov eax,[ebx+0x1be+8+16+16+16] ; get start of extended partition
		267	test eax,eax ; is there extended partition?
		268	jnz new_partition ; yes. read it
		269
		270	end_partition_chain:
		271	mov [partition_count],ecx
		272
		273	cmp edx,-1 ; found wanted partition?
		274	jnz hd_and_partition_ok ; yes. install it
		275	jmp problem_partition_or_fat
		276
		277	scan_partition_types:
		278	push ecx
		279	mov edi,partition_types
		280	mov ecx,partition_types_end-partition_types
		281	cld
		282	repne scasb ; is partition type ok?
		283	pop ecx
		284	ret
		285
		286	scan_extended_types:
		287	push ecx
		288	mov edi,extended_types
		289	mov ecx,extended_types_end-extended_types
		290	cld
		291	repne scasb ; is it extended partition?
		292	pop ecx
		293	ret
		294
		295	problem_fat_dec_count: ; bootsector is missing or another problem
		296	dec [partition_count] ; remove it from partition_count
		297
		298	problem_partition_or_fat:
		299	popad
		300
		301	problem_hd:
256	diamond	302	mov [fs_type],0
65	mario79	303	mov [hd1_status],0 ; free
		304	mov [problem_partition],1
		305	ret
		306
		307	hd_and_partition_ok:
		308	mov eax,edx
		309	mov [PARTITION_START],eax
256	diamond	310	mov edx, [PARTITION_END]
		311	sub edx, eax
		312	inc edx ; edx = length of partition
65	mario79	313
256	diamond	314	; mov [hd_setup],1
65	mario79	315	mov ebx,buffer
		316	call hd_read ; read boot sector of partition
256	diamond	317	cmp [hd_error], 0
		318	jz boot_read_ok
		319	cmp [fs_type], 7
		320	jnz problem_fat_dec_count
		321	; NTFS duplicates bootsector:
		322	; NT4/2k/XP+ saves bootsector copy in the end of disk
		323	; NT 3.51 saves bootsector copy in the middle of disk
		324	and [hd_error], 0
		325	mov eax, [PARTITION_END]
		326	call hd_read
		327	cmp [hd_error], 0
		328	jnz @f
		329	call ntfs_test_bootsec
		330	jnc boot_read_ok
		331	@@:
		332	and [hd_error], 0
		333	mov eax, edx
		334	shr eax, 1
		335	add eax, [PARTITION_START]
		336	call hd_read
		337	cmp [hd_error], 0
		338	jnz problem_fat_dec_count ; �� 졠...
		339	boot_read_ok:
		340	; mov [hd_setup], 0
		341	; if we are running on NTFS, check bootsector
		342	cmp [fs_type], 7
		343	jz ntfs_setup
74	mario79	344
65	mario79	345	cmp word [ebx+0x1fe],0xaa55 ; is it valid boot sector?
		346	jnz problem_fat_dec_count
		347
		348	movzx eax,word [ebx+0xe] ; sectors reserved
		349	add eax,[PARTITION_START]
		350	mov [FAT_START],eax ; fat_start = partition_start + reserved
		351
		352	movzx eax,byte [ebx+0xd] ; sectors per cluster
		353	mov [SECTORS_PER_CLUSTER],eax
		354
		355	movzx ecx,word [ebx+0xb] ; bytes per sector
		356	mov [BYTES_PER_SECTOR],ecx
		357
		358	movzx eax,word [ebx+0x11] ; count of rootdir entries (=0 fat32)
		359	mov edx,32
		360	mul edx
		361	dec ecx
		362	add eax,ecx ; round up if not equal count
		363	inc ecx ; bytes per sector
		364	div ecx
		365	mov [ROOT_SECTORS],eax ; count of rootdir sectors
		366
		367	movzx eax,word [ebx+0x16] ; sectors per fat <65536
		368	test eax,eax
		369	jnz fat16_fatsize
		370	mov eax,[ebx+0x24] ; sectors per fat
		371	fat16_fatsize:
		372	mov [SECTORS_PER_FAT],eax
		373
		374	movzx eax,byte [ebx+0x10] ; number of fats
		375	test eax,eax ; if 0 it's not fat partition
		376	jz problem_fat_dec_count
		377	mov [NUMBER_OF_FATS],eax
		378	imul eax,[SECTORS_PER_FAT]
		379	add eax,[FAT_START]
		380	mov [ROOT_START],eax ; rootdir = fat_start + fat_size * fat_count
		381	add eax,[ROOT_SECTORS] ; rootdir sectors should be 0 on fat32
		382	mov [DATA_START],eax ; data area = rootdir + rootdir_size
		383
		384	movzx eax,word [ebx+0x13] ; total sector count <65536
		385	test eax,eax
		386	jnz fat16_total
		387	mov eax,[ebx+0x20] ; total sector count
		388	fat16_total:
		389	add eax,[PARTITION_START]
		390	dec eax
		391	mov [PARTITION_END],eax
		392	inc eax
		393	sub eax,[DATA_START] ; eax = count of data sectors
		394	xor edx,edx
		395	div dword [SECTORS_PER_CLUSTER]
		396	inc eax
		397	mov [LAST_CLUSTER],eax
		398	dec eax ; cluster count
		399
		400	; limits by Microsoft Hardware White Paper v1.03
		401	cmp eax,4085 ; 0xff5
		402	jb problem_fat_dec_count ; fat12 not supported
		403	cmp eax,65525 ; 0xfff5
		404	jb fat16_partition
		405
		406	fat32_partition:
		407	mov eax,[ebx+0x2c] ; rootdir cluster
		408	mov [ROOT_CLUSTER],eax
		409	movzx eax,word [ebx+0x30] ; fs info sector
		410	add eax,[PARTITION_START]
		411	mov [ADR_FSINFO],eax
		412
		413	popad
		414
		415	mov [fatRESERVED],0x0FFFFFF6
		416	mov [fatBAD],0x0FFFFFF7
		417	mov [fatEND],0x0FFFFFF8
		418	mov [fatMASK],0x0FFFFFFF
256	diamond	419	mov [fs_type],32 ; Fat32
65	mario79	420	mov [hd1_status],0 ; free
		421	ret
		422
		423	fat16_partition:
		424	xor eax,eax
		425	mov [ROOT_CLUSTER],eax
		426
		427	popad
		428
		429	mov [fatRESERVED],0x0000FFF6
		430	mov [fatBAD],0x0000FFF7
		431	mov [fatEND],0x0000FFF8
		432	mov [fatMASK],0x0000FFFF
256	diamond	433	mov [fs_type],16 ; Fat16
65	mario79	434	mov [hd1_status],0 ; free
		435	ret

Subversion Repositories Kolibri OS

(root)/kernel/trunk/fs/part_set.inc – Rev 256