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


;*************************************************************
;* 29.04.2006 Elimination of hangup after the                *
;*             expiration hd_wait_timeout -  Mario79         *
;* 28.01.2006 find all Fat16/32 partition in all input point *
;*            to MBR - Mario79                               *
;*************************************************************
 
align 4
;******************************************************
; Please do not change this place - variables  in text 
; Mario79
; START place
;******************************************************
PARTITION_START      dd 0x3f
PARTITION_END        dd 0
SECTORS_PER_FAT      dd 0x1f3a
NUMBER_OF_FATS       dd 0x2
SECTORS_PER_CLUSTER  dd 0x8
BYTES_PER_SECTOR     dd 0x200   ; Note: if BPS <> 512 need lots of changes
ROOT_CLUSTER         dd 2       ; first rootdir cluster
FAT_START            dd 0       ; start of fat table
ROOT_START           dd 0       ; start of rootdir (only fat16)
ROOT_SECTORS         dd 0       ; count of rootdir sectors (only fat16)
DATA_START           dd 0       ; start of data area (=first cluster 2)
LAST_CLUSTER         dd 0       ; last availabe cluster
ADR_FSINFO           dd 0       ; used only by fat32
 
fatRESERVED          dd 0x0FFFFFF6
fatBAD               dd 0x0FFFFFF7
fatEND               dd 0x0FFFFFF8
fatMASK              dd 0x0FFFFFFF
 
fat_type             db 0       ; 0=none, 16=fat16, 32=fat32
;***************************************************************************
; End place
; Mario79
;***************************************************************************
 
iglobal
  partition_types:              ; list of fat16/32 partitions
    db    0x04                  ; DOS: fat16 <32M
    db    0x06                  ; DOS: fat16 >32M
    db    0x0b                  ; WIN95: fat32
    db    0x0c                  ; WIN95: fat32, LBA-mapped
    db    0x0e                  ; WIN95: fat16, LBA-mapped
    db    0x14                  ; Hidden DOS: fat16 <32M
    db    0x16                  ; Hidden DOS: fat16 >32M
    db    0x1b                  ; Hidden WIN95: fat32
    db    0x1c                  ; Hidden WIN95: fat32, LBA-mapped
    db    0x1e                  ; Hidden WIN95: fat16, LBA-mapped
    db    0xc4                  ; DRDOS/secured: fat16 <32M
    db    0xc6                  ; DRDOS/secured: fat16 >32M
    db    0xcb                  ; DRDOS/secured: fat32
    db    0xcc                  ; DRDOS/secured: fat32, LBA-mapped
    db    0xce                  ; DRDOS/secured: fat16, LBA-mapped
    db    0xd4                  ; Old Multiuser DOS secured: fat16 <32M
    db    0xd6                  ; Old Multiuser DOS secured: fat16 >32M
  partition_types_end:
 
 
  extended_types:               ; list of extended partitions
    db    0x05                  ; DOS: extended partition
    db    0x0f                  ; WIN95: extended partition, LBA-mapped
    db    0xc5                  ; DRDOS/secured: extended partition
    db    0xd5                  ; Old Multiuser DOS secured: extended partition
  extended_types_end:
 
endg
 
; Partition chain used:
; MBR        ;   PARTITION2 ;   PARTITION3 ;   PARTITION4
;==========================================================
; fat16/32   +-- fat16/32   +-- fat16/32   +-- fat16/32   +--
; extended --+   extended --+   extended --+   extended --+
; 0              0              0              0
; 0              0              0              0
; Notes:
; - extended partition need to be in second entry on table
; - it will skip over removed partitions
 
set_FAT32_variables:
    mov   [0xfe10],dword 0      ; entries in hd cache
    mov   [problem_partition],0
    call  reserve_hd1
    call  clear_hd_cache
 
    cmp   dword [hdpos],0
    je    problem_hd
 
    pushad
    xor   ecx,ecx               ; partition count
    mov   edx,-1                ; flag for partition
    xor   eax,eax               ; read MBR
    xor   ebp,ebp               ; extended partition start
 
new_partition:
    test  ebp,ebp               ; is there extended partition?
    jnz   extended_already_set  ; yes
    xchg  ebp,eax               ; no. set it now
 
extended_already_set:
    add   eax,ebp               ; mbr=mbr+0, ext_part=ext_start+relat_start
    mov   ebx,buffer
    call  hd_read
    cmp  [hd_error],0
    jne  problem_hd
 
    cmp   word [ebx+0x1fe],0xaa55 ; is it valid boot sector?
    jnz   end_partition_chain
    cmp   dword [ebx+0x1be+0xc],0 ; skip over empty partition
    jz    next_partition
 
    push  eax
    mov   al,[ebx+0x1be+4]      ; get primary partition type
    call  scan_partition_types
    pop   eax
    jnz   next_primary_partition        ; no. skip over
 
    inc   ecx
    cmp   ecx,[fat32part]       ; is it wanted partition?
    jnz   next_primary_partition        ; no
 
    mov   edx,eax               ; start sector
    add   edx,[ebx+0x1be+8]     ; add relative start
    
next_primary_partition:
    push  eax
    mov   al,[ebx+0x1be+4+16]      ; get primary partition type
    call  scan_partition_types
    pop   eax
    jnz   next_primary_partition_1        ; no. skip over
 
    inc   ecx
    cmp   ecx,[fat32part]       ; is it wanted partition?
    jnz   next_primary_partition_1        ; no
 
    mov   edx,eax               ; start sector
    add   edx,[ebx+0x1be+8+16]     ; add relative start
 
next_primary_partition_1:
    push  eax
    mov   al,[ebx+0x1be+4+16+16]      ; get primary partition type
    call  scan_partition_types
    pop   eax
    jnz   next_primary_partition_2        ; no. skip over
 
    inc   ecx
    cmp   ecx,[fat32part]       ; is it wanted partition?
    jnz   next_primary_partition_2        ; no
 
    mov   edx,eax               ; start sector
    add   edx,[ebx+0x1be+8+16+16]     ; add relative start
 
next_primary_partition_2:
    push  eax
    mov   al,[ebx+0x1be+4+16+16+16]      ; get primary partition type
    call  scan_partition_types
    pop   eax
    jnz   next_partition        ; no. skip over
 
    inc   ecx
    cmp   ecx,[fat32part]       ; is it wanted partition?
    jnz   next_partition        ; no
 
    mov   edx,eax               ; start sector
    add   edx,[ebx+0x1be+8+16+16+16]     ; add relative start
 
next_partition:
    push  eax
    mov   al,[ebx+0x1be+4]   ; get extended partition type
    call  scan_extended_types
    pop   eax
    jnz   next_partition_1
 
    mov   eax,[ebx+0x1be+8]     ; add relative start
    test  eax,eax               ; is there extended partition?
    jnz   new_partition         ; yes. read it
 
next_partition_1:
    push  eax
    mov   al,[ebx+0x1be+4+16]   ; get extended partition type
    call  scan_extended_types
    pop   eax
    jnz   next_partition_2
 
    mov   eax,[ebx+0x1be+8+16]     ; add relative start
    test  eax,eax               ; is there extended partition?
    jnz   new_partition         ; yes. read it
 
next_partition_2:
    push  eax
    mov   al,[ebx+0x1be+4+16+16]   ; get extended partition type
    call  scan_extended_types
    pop   eax
    jnz   next_partition_3
 
    mov   eax,[ebx+0x1be+8+16+16]     ; add relative start
    test  eax,eax               ; is there extended partition?
    jnz   new_partition         ; yes. read it
    
next_partition_3:
    push  eax
    mov   al,[ebx+0x1be+4+16+16+16]   ; get extended partition type
    call  scan_extended_types
    pop   eax
    jnz   end_partition_chain   ; no. end chain
 
    mov   eax,[ebx+0x1be+8+16+16+16]  ; get start of extended partition
    test  eax,eax               ; is there extended partition?
    jnz   new_partition         ; yes. read it
    
end_partition_chain:
    mov   [partition_count],ecx
 
    cmp   edx,-1                ; found wanted partition?
    jnz   hd_and_partition_ok   ; yes. install it
    jmp   problem_partition_or_fat
 
scan_partition_types:
    push  ecx
    mov   edi,partition_types
    mov   ecx,partition_types_end-partition_types
    cld
    repne scasb                 ; is partition type ok?
    pop   ecx
    ret
 
scan_extended_types:
    push  ecx
    mov   edi,extended_types
    mov   ecx,extended_types_end-extended_types
    cld
    repne scasb                 ; is it extended partition?
    pop   ecx
    ret
 
problem_fat_dec_count:          ; bootsector is missing or another problem
    dec   [partition_count]     ; remove it from partition_count
 
problem_partition_or_fat:
    popad
 
problem_hd:
    mov   [fat_type],0
    mov   [hd1_status],0        ; free
    mov   [problem_partition],1
    ret
 
hd_and_partition_ok:
    mov   eax,edx
    mov   [PARTITION_START],eax
 
    mov   [hd_setup],1
    mov   ebx,buffer
    call  hd_read               ; read boot sector of partition
    cmp  [hd_error],0
    jne  problem_fat_dec_count
 
    mov   [hd_setup],0
 
    cmp   word [ebx+0x1fe],0xaa55 ; is it valid boot sector?
    jnz   problem_fat_dec_count
 
    movzx eax,word [ebx+0xe]    ; sectors reserved
    add   eax,[PARTITION_START]
    mov   [FAT_START],eax       ; fat_start = partition_start + reserved
 
    movzx eax,byte [ebx+0xd]    ; sectors per cluster
    mov   [SECTORS_PER_CLUSTER],eax
 
    movzx ecx,word [ebx+0xb]    ; bytes per sector
    mov   [BYTES_PER_SECTOR],ecx
 
    movzx eax,word [ebx+0x11]   ; count of rootdir entries (=0 fat32)
    mov   edx,32
    mul   edx
    dec   ecx
    add   eax,ecx               ; round up if not equal count
    inc   ecx                   ; bytes per sector
    div   ecx
    mov   [ROOT_SECTORS],eax    ; count of rootdir sectors
 
    movzx eax,word [ebx+0x16]   ; sectors per fat <65536
    test  eax,eax
    jnz   fat16_fatsize
    mov   eax,[ebx+0x24]        ; sectors per fat
  fat16_fatsize:
    mov   [SECTORS_PER_FAT],eax
 
    movzx eax,byte [ebx+0x10]   ; number of fats
    test  eax,eax               ; if 0 it's not fat partition
    jz    problem_fat_dec_count
    mov   [NUMBER_OF_FATS],eax
    imul  eax,[SECTORS_PER_FAT]
    add   eax,[FAT_START]
    mov   [ROOT_START],eax      ; rootdir = fat_start + fat_size * fat_count
    add   eax,[ROOT_SECTORS]    ; rootdir sectors should be 0 on fat32
    mov   [DATA_START],eax      ; data area = rootdir + rootdir_size
 
    movzx eax,word [ebx+0x13]   ; total sector count <65536
    test  eax,eax
    jnz   fat16_total
    mov   eax,[ebx+0x20]        ; total sector count
  fat16_total:
    add   eax,[PARTITION_START]
    dec   eax
    mov   [PARTITION_END],eax
    inc   eax
    sub   eax,[DATA_START]      ; eax = count of data sectors
    xor   edx,edx
    div   dword [SECTORS_PER_CLUSTER]
    inc   eax
    mov   [LAST_CLUSTER],eax
    dec   eax                   ; cluster count
 
    ; limits by Microsoft Hardware White Paper v1.03
    cmp   eax,4085              ; 0xff5
    jb    problem_fat_dec_count ; fat12 not supported
    cmp   eax,65525             ; 0xfff5
    jb    fat16_partition
 
fat32_partition:
    mov   eax,[ebx+0x2c]        ; rootdir cluster
    mov   [ROOT_CLUSTER],eax
    movzx eax,word [ebx+0x30]   ; fs info sector
    add   eax,[PARTITION_START]
    mov   [ADR_FSINFO],eax
 
    popad
 
    mov   [fatRESERVED],0x0FFFFFF6
    mov   [fatBAD],0x0FFFFFF7
    mov   [fatEND],0x0FFFFFF8
    mov   [fatMASK],0x0FFFFFFF
    mov   [fat_type],32         ; Fat32
    mov   [hd1_status],0        ; free
    ret
 
fat16_partition:
    xor   eax,eax
    mov   [ROOT_CLUSTER],eax
 
    popad
 
    mov   [fatRESERVED],0x0000FFF6
    mov   [fatBAD],0x0000FFF7
    mov   [fatEND],0x0000FFF8
    mov   [fatMASK],0x0000FFFF
    mov   [fat_type],16         ; Fat16
    mov   [hd1_status],0        ; free
    ret
>
>
>
>
>
>

Rev 65	Rev 74
1	;*************************************************************	1	;*************************************************************
-		2	;* 29.04.2006 Elimination of hangup after the *
-		3	;* expiration hd_wait_timeout - Mario79 *
2	;* 28.01.2006 find all Fat16/32 partition in all input point *	4	;* 28.01.2006 find all Fat16/32 partition in all input point *
3	;* to MBR - Mario79 *	5	;* to MBR - Mario79 *
4	;*************************************************************	6	;*************************************************************
5		7
6	align 4	8	align 4
7	;******************************************************	9	;******************************************************
8	; Please do not change this place - variables in text	10	; Please do not change this place - variables in text
9	; Mario79	11	; Mario79
10	; START place	12	; START place
11	;******************************************************	13	;******************************************************
12	PARTITION_START dd 0x3f	14	PARTITION_START dd 0x3f
13	PARTITION_END dd 0	15	PARTITION_END dd 0
14	SECTORS_PER_FAT dd 0x1f3a	16	SECTORS_PER_FAT dd 0x1f3a
15	NUMBER_OF_FATS dd 0x2	17	NUMBER_OF_FATS dd 0x2
16	SECTORS_PER_CLUSTER dd 0x8	18	SECTORS_PER_CLUSTER dd 0x8
17	BYTES_PER_SECTOR dd 0x200 ; Note: if BPS <> 512 need lots of changes	19	BYTES_PER_SECTOR dd 0x200 ; Note: if BPS <> 512 need lots of changes
18	ROOT_CLUSTER dd 2 ; first rootdir cluster	20	ROOT_CLUSTER dd 2 ; first rootdir cluster
19	FAT_START dd 0 ; start of fat table	21	FAT_START dd 0 ; start of fat table
20	ROOT_START dd 0 ; start of rootdir (only fat16)	22	ROOT_START dd 0 ; start of rootdir (only fat16)
21	ROOT_SECTORS dd 0 ; count of rootdir sectors (only fat16)	23	ROOT_SECTORS dd 0 ; count of rootdir sectors (only fat16)
22	DATA_START dd 0 ; start of data area (=first cluster 2)	24	DATA_START dd 0 ; start of data area (=first cluster 2)
23	LAST_CLUSTER dd 0 ; last availabe cluster	25	LAST_CLUSTER dd 0 ; last availabe cluster
24	ADR_FSINFO dd 0 ; used only by fat32	26	ADR_FSINFO dd 0 ; used only by fat32
25		27
26	fatRESERVED dd 0x0FFFFFF6	28	fatRESERVED dd 0x0FFFFFF6
27	fatBAD dd 0x0FFFFFF7	29	fatBAD dd 0x0FFFFFF7
28	fatEND dd 0x0FFFFFF8	30	fatEND dd 0x0FFFFFF8
29	fatMASK dd 0x0FFFFFFF	31	fatMASK dd 0x0FFFFFFF
30		32
31	fat_type db 0 ; 0=none, 16=fat16, 32=fat32	33	fat_type db 0 ; 0=none, 16=fat16, 32=fat32
32	;***************************************************************************	34	;***************************************************************************
33	; End place	35	; End place
34	; Mario79	36	; Mario79
35	;***************************************************************************	37	;***************************************************************************
36		38
37	iglobal	39	iglobal
38	partition_types: ; list of fat16/32 partitions	40	partition_types: ; list of fat16/32 partitions
39	db 0x04 ; DOS: fat16 <32M	41	db 0x04 ; DOS: fat16 <32M
40	db 0x06 ; DOS: fat16 >32M	42	db 0x06 ; DOS: fat16 >32M
41	db 0x0b ; WIN95: fat32	43	db 0x0b ; WIN95: fat32
42	db 0x0c ; WIN95: fat32, LBA-mapped	44	db 0x0c ; WIN95: fat32, LBA-mapped
43	db 0x0e ; WIN95: fat16, LBA-mapped	45	db 0x0e ; WIN95: fat16, LBA-mapped
44	db 0x14 ; Hidden DOS: fat16 <32M	46	db 0x14 ; Hidden DOS: fat16 <32M
45	db 0x16 ; Hidden DOS: fat16 >32M	47	db 0x16 ; Hidden DOS: fat16 >32M
46	db 0x1b ; Hidden WIN95: fat32	48	db 0x1b ; Hidden WIN95: fat32
47	db 0x1c ; Hidden WIN95: fat32, LBA-mapped	49	db 0x1c ; Hidden WIN95: fat32, LBA-mapped
48	db 0x1e ; Hidden WIN95: fat16, LBA-mapped	50	db 0x1e ; Hidden WIN95: fat16, LBA-mapped
49	db 0xc4 ; DRDOS/secured: fat16 <32M	51	db 0xc4 ; DRDOS/secured: fat16 <32M
50	db 0xc6 ; DRDOS/secured: fat16 >32M	52	db 0xc6 ; DRDOS/secured: fat16 >32M
51	db 0xcb ; DRDOS/secured: fat32	53	db 0xcb ; DRDOS/secured: fat32
52	db 0xcc ; DRDOS/secured: fat32, LBA-mapped	54	db 0xcc ; DRDOS/secured: fat32, LBA-mapped
53	db 0xce ; DRDOS/secured: fat16, LBA-mapped	55	db 0xce ; DRDOS/secured: fat16, LBA-mapped
54	db 0xd4 ; Old Multiuser DOS secured: fat16 <32M	56	db 0xd4 ; Old Multiuser DOS secured: fat16 <32M
55	db 0xd6 ; Old Multiuser DOS secured: fat16 >32M	57	db 0xd6 ; Old Multiuser DOS secured: fat16 >32M
56	partition_types_end:	58	partition_types_end:
57		59
58		60
59	extended_types: ; list of extended partitions	61	extended_types: ; list of extended partitions
60	db 0x05 ; DOS: extended partition	62	db 0x05 ; DOS: extended partition
61	db 0x0f ; WIN95: extended partition, LBA-mapped	63	db 0x0f ; WIN95: extended partition, LBA-mapped
62	db 0xc5 ; DRDOS/secured: extended partition	64	db 0xc5 ; DRDOS/secured: extended partition
63	db 0xd5 ; Old Multiuser DOS secured: extended partition	65	db 0xd5 ; Old Multiuser DOS secured: extended partition
64	extended_types_end:	66	extended_types_end:
65		67
66	endg	68	endg
67		69
68	; Partition chain used:	70	; Partition chain used:
69	; MBR ; PARTITION2 ; PARTITION3 ; PARTITION4	71	; MBR ; PARTITION2 ; PARTITION3 ; PARTITION4
70	;==========================================================	72	;==========================================================
71	; fat16/32 +-- fat16/32 +-- fat16/32 +-- fat16/32 +--	73	; fat16/32 +-- fat16/32 +-- fat16/32 +-- fat16/32 +--
72	; extended --+ extended --+ extended --+ extended --+	74	; extended --+ extended --+ extended --+ extended --+
73	; 0 0 0 0	75	; 0 0 0 0
74	; 0 0 0 0	76	; 0 0 0 0
75	; Notes:	77	; Notes:
76	; - extended partition need to be in second entry on table	78	; - extended partition need to be in second entry on table
77	; - it will skip over removed partitions	79	; - it will skip over removed partitions
78		80
79	set_FAT32_variables:	81	set_FAT32_variables:
80	mov [0xfe10],dword 0 ; entries in hd cache	82	mov [0xfe10],dword 0 ; entries in hd cache
81	mov [problem_partition],0	83	mov [problem_partition],0
82	call reserve_hd1	84	call reserve_hd1
83	call clear_hd_cache	85	call clear_hd_cache
84		86
85	cmp dword [hdpos],0	87	cmp dword [hdpos],0
86	je problem_hd	88	je problem_hd
87		89
88	pushad	90	pushad
89	xor ecx,ecx ; partition count	91	xor ecx,ecx ; partition count
90	mov edx,-1 ; flag for partition	92	mov edx,-1 ; flag for partition
91	xor eax,eax ; read MBR	93	xor eax,eax ; read MBR
92	xor ebp,ebp ; extended partition start	94	xor ebp,ebp ; extended partition start
93		95
94	new_partition:	96	new_partition:
95	test ebp,ebp ; is there extended partition?	97	test ebp,ebp ; is there extended partition?
96	jnz extended_already_set ; yes	98	jnz extended_already_set ; yes
97	xchg ebp,eax ; no. set it now	99	xchg ebp,eax ; no. set it now
98		100
99	extended_already_set:	101	extended_already_set:
100	add eax,ebp ; mbr=mbr+0, ext_part=ext_start+relat_start	102	add eax,ebp ; mbr=mbr+0, ext_part=ext_start+relat_start
101	mov ebx,buffer	103	mov ebx,buffer
102	call hd_read	104	call hd_read
-		105	cmp [hd_error],0
-		106	jne problem_hd
103		107
104	cmp word [ebx+0x1fe],0xaa55 ; is it valid boot sector?	108	cmp word [ebx+0x1fe],0xaa55 ; is it valid boot sector?
105	jnz end_partition_chain	109	jnz end_partition_chain
106	cmp dword [ebx+0x1be+0xc],0 ; skip over empty partition	110	cmp dword [ebx+0x1be+0xc],0 ; skip over empty partition
107	jz next_partition	111	jz next_partition
108		112
109	push eax	113	push eax
110	mov al,[ebx+0x1be+4] ; get primary partition type	114	mov al,[ebx+0x1be+4] ; get primary partition type
111	call scan_partition_types	115	call scan_partition_types
112	pop eax	116	pop eax
113	jnz next_primary_partition ; no. skip over	117	jnz next_primary_partition ; no. skip over
114		118
115	inc ecx	119	inc ecx
116	cmp ecx,[fat32part] ; is it wanted partition?	120	cmp ecx,[fat32part] ; is it wanted partition?
117	jnz next_primary_partition ; no	121	jnz next_primary_partition ; no
118		122
119	mov edx,eax ; start sector	123	mov edx,eax ; start sector
120	add edx,[ebx+0x1be+8] ; add relative start	124	add edx,[ebx+0x1be+8] ; add relative start
121		125
122	next_primary_partition:	126	next_primary_partition:
123	push eax	127	push eax
124	mov al,[ebx+0x1be+4+16] ; get primary partition type	128	mov al,[ebx+0x1be+4+16] ; get primary partition type
125	call scan_partition_types	129	call scan_partition_types
126	pop eax	130	pop eax
127	jnz next_primary_partition_1 ; no. skip over	131	jnz next_primary_partition_1 ; no. skip over
128		132
129	inc ecx	133	inc ecx
130	cmp ecx,[fat32part] ; is it wanted partition?	134	cmp ecx,[fat32part] ; is it wanted partition?
131	jnz next_primary_partition_1 ; no	135	jnz next_primary_partition_1 ; no
132		136
133	mov edx,eax ; start sector	137	mov edx,eax ; start sector
134	add edx,[ebx+0x1be+8+16] ; add relative start	138	add edx,[ebx+0x1be+8+16] ; add relative start
135		139
136	next_primary_partition_1:	140	next_primary_partition_1:
137	push eax	141	push eax
138	mov al,[ebx+0x1be+4+16+16] ; get primary partition type	142	mov al,[ebx+0x1be+4+16+16] ; get primary partition type
139	call scan_partition_types	143	call scan_partition_types
140	pop eax	144	pop eax
141	jnz next_primary_partition_2 ; no. skip over	145	jnz next_primary_partition_2 ; no. skip over
142		146
143	inc ecx	147	inc ecx
144	cmp ecx,[fat32part] ; is it wanted partition?	148	cmp ecx,[fat32part] ; is it wanted partition?
145	jnz next_primary_partition_2 ; no	149	jnz next_primary_partition_2 ; no
146		150
147	mov edx,eax ; start sector	151	mov edx,eax ; start sector
148	add edx,[ebx+0x1be+8+16+16] ; add relative start	152	add edx,[ebx+0x1be+8+16+16] ; add relative start
149		153
150	next_primary_partition_2:	154	next_primary_partition_2:
151	push eax	155	push eax
152	mov al,[ebx+0x1be+4+16+16+16] ; get primary partition type	156	mov al,[ebx+0x1be+4+16+16+16] ; get primary partition type
153	call scan_partition_types	157	call scan_partition_types
154	pop eax	158	pop eax
155	jnz next_partition ; no. skip over	159	jnz next_partition ; no. skip over
156		160
157	inc ecx	161	inc ecx
158	cmp ecx,[fat32part] ; is it wanted partition?	162	cmp ecx,[fat32part] ; is it wanted partition?
159	jnz next_partition ; no	163	jnz next_partition ; no
160		164
161	mov edx,eax ; start sector	165	mov edx,eax ; start sector
162	add edx,[ebx+0x1be+8+16+16+16] ; add relative start	166	add edx,[ebx+0x1be+8+16+16+16] ; add relative start
163		167
164	next_partition:	168	next_partition:
165	push eax	169	push eax
166	mov al,[ebx+0x1be+4] ; get extended partition type	170	mov al,[ebx+0x1be+4] ; get extended partition type
167	call scan_extended_types	171	call scan_extended_types
168	pop eax	172	pop eax
169	jnz next_partition_1	173	jnz next_partition_1
170		174
171	mov eax,[ebx+0x1be+8] ; add relative start	175	mov eax,[ebx+0x1be+8] ; add relative start
172	test eax,eax ; is there extended partition?	176	test eax,eax ; is there extended partition?
173	jnz new_partition ; yes. read it	177	jnz new_partition ; yes. read it
174		178
175	next_partition_1:	179	next_partition_1:
176	push eax	180	push eax
177	mov al,[ebx+0x1be+4+16] ; get extended partition type	181	mov al,[ebx+0x1be+4+16] ; get extended partition type
178	call scan_extended_types	182	call scan_extended_types
179	pop eax	183	pop eax
180	jnz next_partition_2	184	jnz next_partition_2
181		185
182	mov eax,[ebx+0x1be+8+16] ; add relative start	186	mov eax,[ebx+0x1be+8+16] ; add relative start
183	test eax,eax ; is there extended partition?	187	test eax,eax ; is there extended partition?
184	jnz new_partition ; yes. read it	188	jnz new_partition ; yes. read it
185		189
186	next_partition_2:	190	next_partition_2:
187	push eax	191	push eax
188	mov al,[ebx+0x1be+4+16+16] ; get extended partition type	192	mov al,[ebx+0x1be+4+16+16] ; get extended partition type
189	call scan_extended_types	193	call scan_extended_types
190	pop eax	194	pop eax
191	jnz next_partition_3	195	jnz next_partition_3
192		196
193	mov eax,[ebx+0x1be+8+16+16] ; add relative start	197	mov eax,[ebx+0x1be+8+16+16] ; add relative start
194	test eax,eax ; is there extended partition?	198	test eax,eax ; is there extended partition?
195	jnz new_partition ; yes. read it	199	jnz new_partition ; yes. read it
196		200
197	next_partition_3:	201	next_partition_3:
198	push eax	202	push eax
199	mov al,[ebx+0x1be+4+16+16+16] ; get extended partition type	203	mov al,[ebx+0x1be+4+16+16+16] ; get extended partition type
200	call scan_extended_types	204	call scan_extended_types
201	pop eax	205	pop eax
202	jnz end_partition_chain ; no. end chain	206	jnz end_partition_chain ; no. end chain
203		207
204	mov eax,[ebx+0x1be+8+16+16+16] ; get start of extended partition	208	mov eax,[ebx+0x1be+8+16+16+16] ; get start of extended partition
205	test eax,eax ; is there extended partition?	209	test eax,eax ; is there extended partition?
206	jnz new_partition ; yes. read it	210	jnz new_partition ; yes. read it
207		211
208	end_partition_chain:	212	end_partition_chain:
209	mov [partition_count],ecx	213	mov [partition_count],ecx
210		214
211	cmp edx,-1 ; found wanted partition?	215	cmp edx,-1 ; found wanted partition?
212	jnz hd_and_partition_ok ; yes. install it	216	jnz hd_and_partition_ok ; yes. install it
213	jmp problem_partition_or_fat	217	jmp problem_partition_or_fat
214		218
215	scan_partition_types:	219	scan_partition_types:
216	push ecx	220	push ecx
217	mov edi,partition_types	221	mov edi,partition_types
218	mov ecx,partition_types_end-partition_types	222	mov ecx,partition_types_end-partition_types
219	cld	223	cld
220	repne scasb ; is partition type ok?	224	repne scasb ; is partition type ok?
221	pop ecx	225	pop ecx
222	ret	226	ret
223		227
224	scan_extended_types:	228	scan_extended_types:
225	push ecx	229	push ecx
226	mov edi,extended_types	230	mov edi,extended_types
227	mov ecx,extended_types_end-extended_types	231	mov ecx,extended_types_end-extended_types
228	cld	232	cld
229	repne scasb ; is it extended partition?	233	repne scasb ; is it extended partition?
230	pop ecx	234	pop ecx
231	ret	235	ret
232		236
233	problem_fat_dec_count: ; bootsector is missing or another problem	237	problem_fat_dec_count: ; bootsector is missing or another problem
234	dec [partition_count] ; remove it from partition_count	238	dec [partition_count] ; remove it from partition_count
235		239
236	problem_partition_or_fat:	240	problem_partition_or_fat:
237	popad	241	popad
238		242
239	problem_hd:	243	problem_hd:
240	mov [fat_type],0	244	mov [fat_type],0
241	mov [hd1_status],0 ; free	245	mov [hd1_status],0 ; free
242	mov [problem_partition],1	246	mov [problem_partition],1
243	ret	247	ret
244		248
245	hd_and_partition_ok:	249	hd_and_partition_ok:
246	mov eax,edx	250	mov eax,edx
247	mov [PARTITION_START],eax	251	mov [PARTITION_START],eax
248		252
249	mov [hd_setup],1	253	mov [hd_setup],1
250	mov ebx,buffer	254	mov ebx,buffer
251	call hd_read ; read boot sector of partition	255	call hd_read ; read boot sector of partition
-		256	cmp [hd_error],0
-		257	jne problem_fat_dec_count
-		258
252	mov [hd_setup],0	259	mov [hd_setup],0
253		260
254	cmp word [ebx+0x1fe],0xaa55 ; is it valid boot sector?	261	cmp word [ebx+0x1fe],0xaa55 ; is it valid boot sector?
255	jnz problem_fat_dec_count	262	jnz problem_fat_dec_count
256		263
257	movzx eax,word [ebx+0xe] ; sectors reserved	264	movzx eax,word [ebx+0xe] ; sectors reserved
258	add eax,[PARTITION_START]	265	add eax,[PARTITION_START]
259	mov [FAT_START],eax ; fat_start = partition_start + reserved	266	mov [FAT_START],eax ; fat_start = partition_start + reserved
260		267
261	movzx eax,byte [ebx+0xd] ; sectors per cluster	268	movzx eax,byte [ebx+0xd] ; sectors per cluster
262	mov [SECTORS_PER_CLUSTER],eax	269	mov [SECTORS_PER_CLUSTER],eax
263		270
264	movzx ecx,word [ebx+0xb] ; bytes per sector	271	movzx ecx,word [ebx+0xb] ; bytes per sector
265	mov [BYTES_PER_SECTOR],ecx	272	mov [BYTES_PER_SECTOR],ecx
266		273
267	movzx eax,word [ebx+0x11] ; count of rootdir entries (=0 fat32)	274	movzx eax,word [ebx+0x11] ; count of rootdir entries (=0 fat32)
268	mov edx,32	275	mov edx,32
269	mul edx	276	mul edx
270	dec ecx	277	dec ecx
271	add eax,ecx ; round up if not equal count	278	add eax,ecx ; round up if not equal count
272	inc ecx ; bytes per sector	279	inc ecx ; bytes per sector
273	div ecx	280	div ecx
274	mov [ROOT_SECTORS],eax ; count of rootdir sectors	281	mov [ROOT_SECTORS],eax ; count of rootdir sectors
275		282
276	movzx eax,word [ebx+0x16] ; sectors per fat <65536	283	movzx eax,word [ebx+0x16] ; sectors per fat <65536
277	test eax,eax	284	test eax,eax
278	jnz fat16_fatsize	285	jnz fat16_fatsize
279	mov eax,[ebx+0x24] ; sectors per fat	286	mov eax,[ebx+0x24] ; sectors per fat
280	fat16_fatsize:	287	fat16_fatsize:
281	mov [SECTORS_PER_FAT],eax	288	mov [SECTORS_PER_FAT],eax
282		289
283	movzx eax,byte [ebx+0x10] ; number of fats	290	movzx eax,byte [ebx+0x10] ; number of fats
284	test eax,eax ; if 0 it's not fat partition	291	test eax,eax ; if 0 it's not fat partition
285	jz problem_fat_dec_count	292	jz problem_fat_dec_count
286	mov [NUMBER_OF_FATS],eax	293	mov [NUMBER_OF_FATS],eax
287	imul eax,[SECTORS_PER_FAT]	294	imul eax,[SECTORS_PER_FAT]
288	add eax,[FAT_START]	295	add eax,[FAT_START]
289	mov [ROOT_START],eax ; rootdir = fat_start + fat_size * fat_count	296	mov [ROOT_START],eax ; rootdir = fat_start + fat_size * fat_count
290	add eax,[ROOT_SECTORS] ; rootdir sectors should be 0 on fat32	297	add eax,[ROOT_SECTORS] ; rootdir sectors should be 0 on fat32
291	mov [DATA_START],eax ; data area = rootdir + rootdir_size	298	mov [DATA_START],eax ; data area = rootdir + rootdir_size
292		299
293	movzx eax,word [ebx+0x13] ; total sector count <65536	300	movzx eax,word [ebx+0x13] ; total sector count <65536
294	test eax,eax	301	test eax,eax
295	jnz fat16_total	302	jnz fat16_total
296	mov eax,[ebx+0x20] ; total sector count	303	mov eax,[ebx+0x20] ; total sector count
297	fat16_total:	304	fat16_total:
298	add eax,[PARTITION_START]	305	add eax,[PARTITION_START]
299	dec eax	306	dec eax
300	mov [PARTITION_END],eax	307	mov [PARTITION_END],eax
301	inc eax	308	inc eax
302	sub eax,[DATA_START] ; eax = count of data sectors	309	sub eax,[DATA_START] ; eax = count of data sectors
303	xor edx,edx	310	xor edx,edx
304	div dword [SECTORS_PER_CLUSTER]	311	div dword [SECTORS_PER_CLUSTER]
305	inc eax	312	inc eax
306	mov [LAST_CLUSTER],eax	313	mov [LAST_CLUSTER],eax
307	dec eax ; cluster count	314	dec eax ; cluster count
308		315
309	; limits by Microsoft Hardware White Paper v1.03	316	; limits by Microsoft Hardware White Paper v1.03
310	cmp eax,4085 ; 0xff5	317	cmp eax,4085 ; 0xff5
311	jb problem_fat_dec_count ; fat12 not supported	318	jb problem_fat_dec_count ; fat12 not supported
312	cmp eax,65525 ; 0xfff5	319	cmp eax,65525 ; 0xfff5
313	jb fat16_partition	320	jb fat16_partition
314		321
315	fat32_partition:	322	fat32_partition:
316	mov eax,[ebx+0x2c] ; rootdir cluster	323	mov eax,[ebx+0x2c] ; rootdir cluster
317	mov [ROOT_CLUSTER],eax	324	mov [ROOT_CLUSTER],eax
318	movzx eax,word [ebx+0x30] ; fs info sector	325	movzx eax,word [ebx+0x30] ; fs info sector
319	add eax,[PARTITION_START]	326	add eax,[PARTITION_START]
320	mov [ADR_FSINFO],eax	327	mov [ADR_FSINFO],eax
321		328
322	popad	329	popad
323		330
324	mov [fatRESERVED],0x0FFFFFF6	331	mov [fatRESERVED],0x0FFFFFF6
325	mov [fatBAD],0x0FFFFFF7	332	mov [fatBAD],0x0FFFFFF7
326	mov [fatEND],0x0FFFFFF8	333	mov [fatEND],0x0FFFFFF8
327	mov [fatMASK],0x0FFFFFFF	334	mov [fatMASK],0x0FFFFFFF
328	mov [fat_type],32 ; Fat32	335	mov [fat_type],32 ; Fat32
329	mov [hd1_status],0 ; free	336	mov [hd1_status],0 ; free
330	ret	337	ret
331		338
332	fat16_partition:	339	fat16_partition:
333	xor eax,eax	340	xor eax,eax
334	mov [ROOT_CLUSTER],eax	341	mov [ROOT_CLUSTER],eax
335		342
336	popad	343	popad
337		344
338	mov [fatRESERVED],0x0000FFF6	345	mov [fatRESERVED],0x0000FFF6
339	mov [fatBAD],0x0000FFF7	346	mov [fatBAD],0x0000FFF7
340	mov [fatEND],0x0000FFF8	347	mov [fatEND],0x0000FFF8
341	mov [fatMASK],0x0000FFFF	348	mov [fatMASK],0x0000FFFF
342	mov [fat_type],16 ; Fat16	349	mov [fat_type],16 ; Fat16
343	mov [hd1_status],0 ; free	350	mov [hd1_status],0 ; free
344	ret	351	ret
345	>	352	>
346	>	353	>
347	>	354	>
348	>	355	>
349	>	356	>
350	>	357	>

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(root)/kernel/trunk/fs/part_set.inc @ 108 – Rev 65 → 74