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Rev 2455 Rev 2643
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;; Copyright (C) KolibriOS team 2004-2011. All rights reserved. ;;
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;; Copyright (C) KolibriOS team 2004-2011. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License    ;;
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;; Distributed under terms of the GNU General Public License    ;;
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;;                                                              ;;
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;;                                                              ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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$Revision: 2455 $
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$Revision: 2643 $
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align 4
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align 4
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fs_dependent_data_start:
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fs_dependent_data_start:
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; FATxx data
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SECTORS_PER_FAT      dd 0x1f3a
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NUMBER_OF_FATS       dd 0x2
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SECTORS_PER_CLUSTER  dd 0x8
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BYTES_PER_SECTOR     dd 0x200   ; Note: if BPS <> 512 need lots of changes
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ROOT_CLUSTER         dd 2       ; first rootdir cluster
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FAT_START            dd 0       ; start of fat table
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ROOT_START           dd 0       ; start of rootdir (only fat16)
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ROOT_SECTORS         dd 0       ; count of rootdir sectors (only fat16)
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DATA_START           dd 0       ; start of data area (=first cluster 2)
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LAST_CLUSTER         dd 0       ; last availabe cluster
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ADR_FSINFO           dd 0       ; used only by fat32
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; FATxx data
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fatRESERVED          dd 0x0FFFFFF6
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fatBAD               dd 0x0FFFFFF7
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fatEND               dd 0x0FFFFFF8
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fatMASK              dd 0x0FFFFFFF
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.partition      dd      ?
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fatStartScan         dd 2
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                rb      80
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fs_dependent_data_end:
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fs_dependent_data_end:
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        mov     eax, [PARTITION_START]  ;ext2 test changes [buffer]
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        mov     eax, [PARTITION_START]  ;ext2 test changes [buffer]
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        call    hd_read
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        call    hd_read
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        cmp     [hd_error], 0
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        cmp     [hd_error], 0
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        jnz     problem_fat_dec_count
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        jnz     problem_fat_dec_count
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        cmp     word [ebx+0x1fe], 0xaa55; is it valid boot sector?
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        jnz     problem_fat_dec_count
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        push    0
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        movzx   eax, word [ebx+0xe]; sectors reserved
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        mov     eax, [PARTITION_END]
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        add     eax, [PARTITION_START]
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        mov     [FAT_START], eax; fat_start = partition_start + reserved
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        movzx   eax, byte [ebx+0xd]; sectors per cluster
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        sub     eax, [PARTITION_START]
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        test    eax, eax
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        inc     eax
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        jz      problem_fat_dec_count
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        mov     [SECTORS_PER_CLUSTER], eax
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        movzx   ecx, word [ebx+0xb]; bytes per sector
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        push    eax
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        cmp     ecx, 0x200
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        jnz     problem_fat_dec_count
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        push    0
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        mov     [BYTES_PER_SECTOR], ecx
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        movzx   eax, word [ebx+0x11]; count of rootdir entries (=0 fat32)
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        push    [PARTITION_START]
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        mov     edx, 32
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        push    ebp
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        mul     edx
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        push    ebp
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        dec     ecx
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        mov     ebp, esp
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        add     eax, ecx        ; round up if not equal count
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        mov     esi, 'old'      ; special value: there is no DISK structure
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        inc     ecx             ; bytes per sector
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        push    1       ; bootsector read successfully
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        div     ecx
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        mov     [ROOT_SECTORS], eax; count of rootdir sectors
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        call    fat_create_partition
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        movzx   eax, word [ebx+0x16]; sectors per fat <65536
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        add     esp, 4*7
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        test    eax, eax
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        jnz     fat16_fatsize
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        mov     eax, [ebx+0x24] ; sectors per fat
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  fat16_fatsize:
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        mov     [SECTORS_PER_FAT], eax
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        movzx   eax, byte [ebx+0x10]; number of fats
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        test    eax, eax        ; if 0 it's not fat partition
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        test    eax, eax
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        jz      problem_fat_dec_count
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        mov     [NUMBER_OF_FATS], eax
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        imul    eax, [SECTORS_PER_FAT]
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        add     eax, [FAT_START]
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        mov     [ROOT_START], eax; rootdir = fat_start + fat_size * fat_count
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        add     eax, [ROOT_SECTORS]; rootdir sectors should be 0 on fat32
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        mov     [DATA_START], eax; data area = rootdir + rootdir_size
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        movzx   eax, word [ebx+0x13]; total sector count <65536
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        test    eax, eax
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        jnz     fat16_total
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        mov     eax, [ebx+0x20] ; total sector count
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  fat16_total:
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        add     eax, [PARTITION_START]
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        dec     eax
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        mov     [PARTITION_END], eax
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        inc     eax
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        sub     eax, [DATA_START]; eax = count of data sectors
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        xor     edx, edx
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        div     dword [SECTORS_PER_CLUSTER]
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        inc     eax
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        mov     [LAST_CLUSTER], eax
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        dec     eax             ; cluster count
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        jz      problem_fat_dec_count
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        mov     [fatStartScan], 2
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    ; limits by Microsoft Hardware White Paper v1.03
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        cmp     eax, 4085       ; 0xff5
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        jb      problem_fat_dec_count; fat12 not supported
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        cmp     eax, 65525      ; 0xfff5
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        jb      fat16_partition
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fat32_partition:
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        mov     eax, [ebx+0x2c] ; rootdir cluster
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        mov     [ROOT_CLUSTER], eax
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        movzx   eax, word [ebx+0x30]; fs info sector
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        add     eax, [PARTITION_START]
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        mov     [ADR_FSINFO], eax
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        call    hd_read
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        mov     [fs_dependent_data_start.partition], eax
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        mov     eax, [ebx+0x1ec]
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        cmp     eax, -1
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        jz      @f
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        mov     [fatStartScan], eax
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@@:
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        popad
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        mov     [fatRESERVED], 0x0FFFFFF6
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        mov     [fatBAD], 0x0FFFFFF7
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        mov     [fatEND], 0x0FFFFFF8
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        mov     [fatMASK], 0x0FFFFFFF
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        mov     al, [eax+FAT.fs_type]
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        mov     [fs_type], 32  ; Fat32
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        call    free_hd_channel
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        mov     [hd1_status], 0 ; free
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        ret
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fat16_partition:
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        xor     eax, eax
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        mov     [ROOT_CLUSTER], eax
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        mov     [fs_type], al
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        popad
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        mov     [fatRESERVED], 0x0000FFF6
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        mov     [fatBAD], 0x0000FFF7
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        mov     [fatEND], 0x0000FFF8
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        mov     [fatMASK], 0x0000FFFF
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        mov     [fs_type], 16  ; Fat16
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        popad
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        call    free_hd_channel
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        call    free_hd_channel
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        mov     [hd1_status], 0 ; free
 -