kolibrios/kernel/trunk/fs/part_set.inc

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;;                                                              ;;
;; Copyright (C) KolibriOS team 2004-2011. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License    ;;
;;                                                              ;;
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$Revision$


;*************************************************************
;* 13.02.2010 Find all partition and check supported FS
;* 12.07.2007 Check all 4 entry of MBR and EMBR
;* 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
;*************************************************************

uglobal
align 4

;******************************************************
; Please do not change this place - variables  in text
; Mario79
; START place
;******************************************************
PARTITION_START      dd 0x3f
PARTITION_END        dd 0
fs_type              db 0       ; 1=NTFS, 2=EXT2/3, 16=FAT16, 32=FAT32
align 4

fs_dependent_data_start:
; FATxx data

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

fatStartScan         dd 2

fs_dependent_data_end:
file_system_data_size = $ - PARTITION_START
if file_system_data_size > 96
ERROR:
       sizeof(file system data) too big!
end if

virtual at fs_dependent_data_start
; NTFS data
ntfs_data:
.sectors_per_cluster    dd      ?
.mft_cluster            dd      ?
.mftmirr_cluster        dd      ?
.frs_size               dd      ?       ; FRS size in bytes
.iab_size               dd      ?       ; IndexAllocationBuffer size in bytes
.frs_buffer             dd      ?
.iab_buffer             dd      ?
.mft_retrieval          dd      ?
.mft_retrieval_size     dd      ?
.mft_retrieval_alloc    dd      ?
.mft_retrieval_end      dd      ?
.cur_index_size         dd      ?
.cur_index_buf          dd      ?
if $ > fs_dependent_data_end
ERROR:
       increase sizeof(fs_dependent_data)!
end if
end virtual

virtual at fs_dependent_data_start
; EXT2 data
ext2_data:
    .log_block_size                 dd ?
    .block_size                     dd ?
    .count_block_in_block           dd ?
    .blocks_per_group               dd ?
    .inodes_per_group               dd ?
    .global_desc_table              dd ?
    .root_inode                     dd ?        ; pointer to root inode in memory
    .inode_size                     dd ?
    .count_pointer_in_block         dd ?        ;  block_size / 4
    .count_pointer_in_block_square  dd ?        ; (block_size / 4)**2
    .ext2_save_block                dd ?    ; <EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> 1 <EFBFBD><EFBFBD><EFBFBD>楤<EFBFBD><EFBFBD><EFBFBD>
    .ext2_temp_block                dd ?    ; <EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD>楤<EFBFBD><EFBFBD>
    .ext2_save_inode                dd ?    ; inode <EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD>楤<EFBFBD><EFBFBD><EFBFBD>
    .ext2_temp_inode                dd ?    ; inode <EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD>楤<EFBFBD><EFBFBD>
    .sb                             dd ?    ; superblock
    .groups_count                   dd ?
if $ > fs_dependent_data_end
ERROR:
       increase sizeof(fs_dependent_data)!
end if
end virtual

;***************************************************************************
; End place
; Mario79
;***************************************************************************
endg
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
    db    0x07                  ; NTFS
    db    0x27                  ; NTFS, hidden
    db    0x83                  ; Linux native file system (ext2fs)
  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 <---------------------
; |                         |
; |-> PARTITION1          |
; |-> EXTENDED PARTITION -        ;not need be second partition
; |-> PARTITION3
; |-> PARTITION4

set_PARTITION_variables:
set_FAT32_variables:        ;deprecated
        and     [problem_partition], 0
        call    reserve_hd1
        call    reserve_hd_channel

        pushad

        cmp     dword [hdpos], 0
        je      problem_hd

        xor     ecx, ecx        ; partition count
    ;or    edx,-1                ; flag for partition
        xor     eax, eax        ; address MBR
        xor     ebp, ebp        ; extended partition start

new_mbr:
        test    ebp, ebp        ; is there extended partition? (MBR or EMBR)
        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
        push    eax                ; push only one time
        cmp     dword [ebx+0x1be+0xc], 0; skip over empty partition
        jnz     test_primary_partition_0
        cmp     dword [ebx+0x1be+0xc+16], 0
        jnz     test_primary_partition_1
        cmp     dword [ebx+0x1be+0xc+16+16], 0
        jnz     test_primary_partition_2
        cmp     dword [ebx+0x1be+0xc+16+16+16], 0
        jnz     test_primary_partition_3
        pop     eax
        jmp     end_partition_chain

test_primary_partition_0:
        mov     al, [ebx+0x1be+4]; get primary partition type
        call    scan_partition_types
        jnz     test_primary_partition_1; no. skip over

        inc     ecx
        cmp     ecx, [known_part]; is it wanted partition?
        jnz     test_primary_partition_1; no

        pop     eax
        ;mov     edx, eax                ; start sector
        add     eax, [ebx+0x1be+8]      ; add relative start
        ;mov     [PARTITON_START],edx
        ;push    edx
        mov     edx, [ebx+0x1be+12]     ; length
        ;add     edx, eax                ; add length
        ;dec     edx                     ; PARTITION_END is inclusive
        ;mov     [PARTITION_END], edx    ; note that this can be changed
                                        ; when file system data will be available
        mov     cl, [ebx+0x1be+4]       ; fs_type
        ;mov     [fs_type], dl           ; save for FS recognizer (separate FAT vs NTFS)
        ;pop     edx
        jmp     hd_and_partition_ok

test_primary_partition_1:
        mov     al, [ebx+0x1be+4+16]; get primary partition type
        call    scan_partition_types
        jnz     test_primary_partition_2  ; no. skip over

        inc     ecx
        cmp     ecx, [known_part]; is it wanted partition?
        jnz     test_primary_partition_2  ; no

        pop     eax
        add     eax, [ebx+0x1be+8+16]
        mov     edx, [ebx+0x1be+12+16]
        mov     cl, [ebx+0x1be+4+16]
        jmp     hd_and_partition_ok

        ;mov     edx, eax
        ;add     edx, [ebx+0x1be+8+16]
        ;push    edx
        ;add     edx, [ebx+0x1be+12+16]
        ;dec     edx
        ;mov     [PARTITION_END], edx
        ;mov     al, [ebx+0x1be+4+16]
        ;mov     [fs_type], dl
        ;pop     edx

test_primary_partition_2:
        mov     al, [ebx+0x1be+4+16+16]; get primary partition type
        call    scan_partition_types
        jnz     test_primary_partition_3  ; no. skip over

        inc     ecx
        cmp     ecx, [known_part]; is it wanted partition?
        jnz     test_primary_partition_3  ; no

        pop     eax
        add     eax, [ebx+0x1be+8+16+16]
        mov     edx, [ebx+0x1be+12+16+16]
        mov     cl, [ebx+0x1be+4+16+16]
        jmp     hd_and_partition_ok
        ;mov     edx, eax
        ;add     edx, [ebx+0x1be+8+16+16]
        ;push    edx
        ;add     edx, [ebx+0x1be+12+16+16]
        ;dec     edx
        ;mov     [PARTITION_END], edx
        ;mov     al, [ebx+0x1be+4+16+16]
        ;mov     [fs_type], dl
        ;pop     edx

test_primary_partition_3:
        mov     al, [ebx+0x1be+4+16+16+16]; get primary partition type
        call    scan_partition_types
        jnz     test_ext_partition_0  ; no. skip over

        inc     ecx
        cmp     ecx, [known_part]; is it wanted partition?
        jnz     test_ext_partition_0; no

        pop     eax
        add     eax, [ebx+0x1be+8+16+16+16]
        mov     edx, [ebx+0x1be+12+16+16+16]
        mov     cl, [ebx+0x1be+4+16+16+16]
        jmp     hd_and_partition_ok

        ;mov     edx, eax
        ;add     edx, [ebx+0x1be+8+16+16+16]
        ;push    edx
        ;add     edx, [ebx+0x1be+12+16+16+16]
        ;dec     edx
        ;mov     [PARTITION_END], edx
        ;mov     al, [ebx+0x1be+4+16+16+16]
        ;mov     [fs_type], dl
        ;pop     edx

test_ext_partition_0:
        pop     eax         ; <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <EFBFBD>모<EFBFBD>뢠<EFBFBD><EFBFBD> <EFBFBD><EFBFBD> <EFBFBD>⥪<EFBFBD>
        mov     al, [ebx+0x1be+4]; get extended partition type
        call    scan_extended_types
        jnz     test_ext_partition_1

        mov     eax, [ebx+0x1be+8]; add relative start
        test    eax, eax        ; is there extended partition?
        jnz     new_mbr         ; yes. read it

test_ext_partition_1:
        mov     al, [ebx+0x1be+4+16]; get extended partition type
        call    scan_extended_types
        jnz     test_ext_partition_2

        mov     eax, [ebx+0x1be+8+16]; add relative start
        test    eax, eax        ; is there extended partition?
        jnz     new_mbr         ; yes. read it

test_ext_partition_2:
        mov     al, [ebx+0x1be+4+16+16]; get extended partition type
        call    scan_extended_types
        jnz     test_ext_partition_3

        mov     eax, [ebx+0x1be+8+16+16]; add relative start
        test    eax, eax        ; is there extended partition?
        jnz     new_mbr         ; yes. read it

test_ext_partition_3:
        mov     al, [ebx+0x1be+4+16+16+16]; get extended partition type
        call    scan_extended_types
        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_mbr         ; 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
problem_hd:
        or      [problem_partition], 2
        jmp     return_from_part_set


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:
        or      [problem_partition], 1

return_from_part_set:
        popad
    ;mov   [fs_type],0
        call    free_hd_channel
        mov     [hd1_status], 0 ; free
        ret

hd_and_partition_ok:

;eax = PARTITION_START edx=PARTITION_LENGTH cl=fs_type
        mov     [fs_type], cl
    ;mov   eax,edx
        mov     [PARTITION_START], eax
        add     edx, eax
        dec     edx
        mov     [PARTITION_END], edx

   ;     mov     edx, [PARTITION_END]
   ;     sub     edx, eax
   ;     inc     edx     ; edx = length of partition <EFBFBD><EFBFBD>祬 <EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD><EFBFBD>??

;    mov   [hd_setup],1
        mov     ebx, buffer
        call    hd_read         ; read boot sector of partition
        cmp     [hd_error], 0
        jz      boot_read_ok
        cmp     [fs_type], 7
        jnz     problem_fat_dec_count
; NTFS duplicates bootsector:
; NT4/2k/XP+ saves bootsector copy in the end of disk
; NT 3.51 saves bootsector copy in the middle of disk
        and     [hd_error], 0
        mov     eax, [PARTITION_END]
        call    hd_read
        cmp     [hd_error], 0
        jnz     @f
        call    ntfs_test_bootsec
        jnc     boot_read_ok
@@:
        and     [hd_error], 0
        mov     eax, edx
        shr     eax, 1
        add     eax, [PARTITION_START]
        call    hd_read
        cmp     [hd_error], 0
        jnz     problem_fat_dec_count   ; no chance...
boot_read_ok:

; if we are running on NTFS, check bootsector

        call    ntfs_test_bootsec      ; test ntfs
        jnc     ntfs_setup

        call    ext2_test_superblock   ; test ext2fs
        jnc     ext2_setup

        mov     eax, [PARTITION_START]  ;ext2 test changes [buffer]
        call    hd_read
        cmp     [hd_error], 0
        jnz     problem_fat_dec_count

        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
        test    eax, eax
        jz      problem_fat_dec_count
        mov     [SECTORS_PER_CLUSTER], eax

        movzx   ecx, word [ebx+0xb]; bytes per sector
        cmp     ecx, 0x200
        jnz     problem_fat_dec_count
        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
        mov     [fatStartScan], 2

    ; 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
        call    hd_read
        mov     eax, [ebx+0x1ec]
        cmp     eax, -1
        jz      @f
        mov     [fatStartScan], eax
@@:

        popad

        mov     [fatRESERVED], 0x0FFFFFF6
        mov     [fatBAD], 0x0FFFFFF7
        mov     [fatEND], 0x0FFFFFF8
        mov     [fatMASK], 0x0FFFFFFF
        mov     [fs_type], 32  ; Fat32
        call    free_hd_channel
        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     [fs_type], 16  ; Fat16
        call    free_hd_channel
        mov     [hd1_status], 0 ; free
        ret